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 2, 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 COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
24 /* This file handles generation of all the assembler code
25 *except* the instructions of a function.
26 This includes declarations of variables and their initial values.
28 We also output the assembler code for constants stored in memory
29 and are responsible for combining constants with the same value. */
33 #include "coretypes.h"
40 #include "hard-reg-set.h"
48 #include "langhooks.h"
52 #include "tree-mudflap.h"
54 #include "cfglayout.h"
55 #include "basic-block.h"
56 #include "tree-iterator.h"
58 #ifdef XCOFF_DEBUGGING_INFO
59 #include "xcoffout.h" /* Needed for external data
60 declarations for e.g. AIX 4.x. */
63 /* The (assembler) name of the first globally-visible object output. */
64 extern GTY(()) const char *first_global_object_name;
65 extern GTY(()) const char *weak_global_object_name;
67 const char *first_global_object_name;
68 const char *weak_global_object_name;
71 struct constant_descriptor_rtx;
72 struct rtx_constant_pool;
74 struct varasm_status GTY(())
76 /* If we're using a per-function constant pool, this is it. */
77 struct rtx_constant_pool *pool;
79 /* Number of tree-constants deferred during the expansion of this
81 unsigned int deferred_constants;
84 #define n_deferred_constants (cfun->varasm->deferred_constants)
86 /* Number for making the label on the next
87 constant that is stored in memory. */
89 static GTY(()) int const_labelno;
91 /* Carry information from ASM_DECLARE_OBJECT_NAME
92 to ASM_FINISH_DECLARE_OBJECT. */
94 int size_directive_output;
96 /* The last decl for which assemble_variable was called,
97 if it did ASM_DECLARE_OBJECT_NAME.
98 If the last call to assemble_variable didn't do that,
101 tree last_assemble_variable_decl;
103 /* The following global variable indicates if the first basic block
104 in a function belongs to the cold partition or not. */
106 bool first_function_block_is_cold;
108 /* We give all constants their own alias set. Perhaps redundant with
109 MEM_READONLY_P, but pre-dates it. */
111 static HOST_WIDE_INT const_alias_set;
113 static const char *strip_reg_name (const char *);
114 static int contains_pointers_p (tree);
115 #ifdef ASM_OUTPUT_EXTERNAL
116 static bool incorporeal_function_p (tree);
118 static void decode_addr_const (tree, struct addr_const *);
119 static hashval_t const_desc_hash (const void *);
120 static int const_desc_eq (const void *, const void *);
121 static hashval_t const_hash_1 (const tree);
122 static int compare_constant (const tree, const tree);
123 static tree copy_constant (tree);
124 static void output_constant_def_contents (rtx);
125 static void output_addressed_constants (tree);
126 static unsigned HOST_WIDE_INT array_size_for_constructor (tree);
127 static unsigned min_align (unsigned, unsigned);
128 static void output_constructor (tree, unsigned HOST_WIDE_INT, unsigned int);
129 static void globalize_decl (tree);
130 #ifdef BSS_SECTION_ASM_OP
131 #ifdef ASM_OUTPUT_BSS
132 static void asm_output_bss (FILE *, tree, const char *,
133 unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT);
135 #ifdef ASM_OUTPUT_ALIGNED_BSS
136 static void asm_output_aligned_bss (FILE *, tree, const char *,
137 unsigned HOST_WIDE_INT, int)
140 #endif /* BSS_SECTION_ASM_OP */
141 static void mark_weak (tree);
142 static void output_constant_pool (const char *, tree);
144 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
145 section *text_section;
146 section *data_section;
147 section *readonly_data_section;
148 section *sdata_section;
149 section *ctors_section;
150 section *dtors_section;
151 section *bss_section;
152 section *sbss_section;
154 /* Various forms of common section. All are guaranteed to be nonnull. */
155 section *tls_comm_section;
156 section *comm_section;
157 section *lcomm_section;
159 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
161 section *bss_noswitch_section;
163 /* The section that holds the main exception table, when known. The section
164 is set either by the target's init_sections hook or by the first call to
165 switch_to_exception_section. */
166 section *exception_section;
168 /* The section that holds the DWARF2 frame unwind information, when known.
169 The section is set either by the target's init_sections hook or by the
170 first call to switch_to_eh_frame_section. */
171 section *eh_frame_section;
173 /* asm_out_file's current section. This is NULL if no section has yet
174 been selected or if we lose track of what the current section is. */
177 /* True if code for the current function is currently being directed
178 at the cold section. */
179 bool in_cold_section_p;
181 /* A linked list of all the unnamed sections. */
182 static GTY(()) section *unnamed_sections;
184 /* Return a nonzero value if DECL has a section attribute. */
185 #ifndef IN_NAMED_SECTION
186 #define IN_NAMED_SECTION(DECL) \
187 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
188 && DECL_SECTION_NAME (DECL) != NULL_TREE)
191 /* Hash table of named sections. */
192 static GTY((param_is (section))) htab_t section_htab;
194 /* A table of object_blocks, indexed by section. */
195 static GTY((param_is (struct object_block))) htab_t object_block_htab;
197 /* The next number to use for internal anchor labels. */
198 static GTY(()) int anchor_labelno;
200 /* A pool of constants that can be shared between functions. */
201 static GTY(()) struct rtx_constant_pool *shared_constant_pool;
205 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map)))
207 static GTY (()) tree emutls_object_type;
209 #ifndef NO_DOT_IN_LABEL
210 # define EMUTLS_VAR_PREFIX "__emutls_v."
211 # define EMUTLS_TMPL_PREFIX "__emutls_t."
212 #elif !defined NO_DOLLAR_IN_LABEL
213 # define EMUTLS_VAR_PREFIX "__emutls_v$"
214 # define EMUTLS_TMPL_PREFIX "__emutls_t$"
216 # define EMUTLS_VAR_PREFIX "__emutls_v_"
217 # define EMUTLS_TMPL_PREFIX "__emutls_t_"
220 /* Create an identifier for the struct __emutls_object, given an identifier
221 of the DECL_ASSEMBLY_NAME of the original object. */
224 get_emutls_object_name (tree name)
226 char *toname = alloca (strlen (IDENTIFIER_POINTER (name))
227 + sizeof (EMUTLS_VAR_PREFIX));
228 strcpy (toname, EMUTLS_VAR_PREFIX);
229 strcpy (toname + sizeof (EMUTLS_VAR_PREFIX) - 1, IDENTIFIER_POINTER (name));
231 return get_identifier (toname);
234 /* Create the structure for struct __emutls_object. This should match the
235 structure at the top of emutls.c, modulo the union there. */
238 get_emutls_object_type (void)
240 tree type, type_name, field, next_field, word_type_node;
242 type = emutls_object_type;
246 emutls_object_type = type = lang_hooks.types.make_type (RECORD_TYPE);
247 type_name = get_identifier ("__emutls_object");
248 type_name = build_decl (TYPE_DECL, type_name, type);
249 TYPE_NAME (type) = type_name;
251 field = build_decl (FIELD_DECL, get_identifier ("__templ"), ptr_type_node);
252 DECL_CONTEXT (field) = type;
255 field = build_decl (FIELD_DECL, get_identifier ("__offset"), ptr_type_node);
256 DECL_CONTEXT (field) = type;
257 TREE_CHAIN (field) = next_field;
260 word_type_node = lang_hooks.types.type_for_mode (word_mode, 1);
261 field = build_decl (FIELD_DECL, get_identifier ("__align"), word_type_node);
262 DECL_CONTEXT (field) = type;
263 TREE_CHAIN (field) = next_field;
266 field = build_decl (FIELD_DECL, get_identifier ("__size"), word_type_node);
267 DECL_CONTEXT (field) = type;
268 TREE_CHAIN (field) = next_field;
270 TYPE_FIELDS (type) = field;
276 /* Create a read-only variable like DECL, with the same DECL_INITIAL.
277 This will be used for initializing the emulated tls data area. */
280 get_emutls_init_templ_addr (tree decl)
285 if (!DECL_INITIAL (decl))
286 return null_pointer_node;
288 name = DECL_ASSEMBLER_NAME (decl);
289 toname = alloca (strlen (IDENTIFIER_POINTER (name))
290 + sizeof (EMUTLS_TMPL_PREFIX));
291 strcpy (toname, EMUTLS_TMPL_PREFIX);
292 strcpy (toname + sizeof (EMUTLS_TMPL_PREFIX) - 1, IDENTIFIER_POINTER (name));
293 name = get_identifier (toname);
295 to = build_decl (VAR_DECL, name, TREE_TYPE (decl));
296 SET_DECL_ASSEMBLER_NAME (to, DECL_NAME (to));
298 DECL_ARTIFICIAL (to) = 1;
299 TREE_USED (to) = TREE_USED (decl);
300 TREE_READONLY (to) = 1;
301 DECL_IGNORED_P (to) = 1;
302 DECL_CONTEXT (to) = DECL_CONTEXT (decl);
303 DECL_WEAK (to) = DECL_WEAK (decl);
304 if (DECL_ONE_ONLY (decl))
306 make_decl_one_only (to);
307 TREE_STATIC (to) = TREE_STATIC (decl);
308 TREE_PUBLIC (to) = TREE_PUBLIC (decl);
309 DECL_VISIBILITY (to) = DECL_VISIBILITY (decl);
312 TREE_STATIC (to) = 1;
314 DECL_INITIAL (to) = DECL_INITIAL (decl);
315 DECL_INITIAL (decl) = NULL;
317 varpool_finalize_decl (to);
318 return build_fold_addr_expr (to);
321 /* When emulating tls, we use a control structure for use by the runtime.
322 Create and return this structure. */
325 emutls_decl (tree decl)
328 struct tree_map *h, in;
331 if (targetm.have_tls || decl == NULL || decl == error_mark_node
332 || TREE_CODE (decl) != VAR_DECL || ! DECL_THREAD_LOCAL_P (decl))
335 /* Look up the object in the hash; return the control structure if
336 it has already been created. */
338 emutls_htab = htab_create_ggc (512, tree_map_hash, tree_map_eq, 0);
340 name = DECL_ASSEMBLER_NAME (decl);
342 /* Note that we use the hash of the decl's name, rather than a hash
343 of the decl's pointer. In emutls_finish we iterate through the
344 hash table, and we want this traversal to be predictable. */
345 in.hash = htab_hash_string (IDENTIFIER_POINTER (name));
347 loc = htab_find_slot_with_hash (emutls_htab, &in, in.hash, INSERT);
353 to = build_decl (VAR_DECL, get_emutls_object_name (name),
354 get_emutls_object_type ());
356 h = ggc_alloc (sizeof (struct tree_map));
360 *(struct tree_map **) loc = h;
362 DECL_ARTIFICIAL (to) = 1;
363 DECL_IGNORED_P (to) = 1;
364 TREE_READONLY (to) = 0;
366 SET_DECL_ASSEMBLER_NAME (to, DECL_NAME (to));
367 if (DECL_ONE_ONLY (decl))
368 make_decl_one_only (to);
369 DECL_CONTEXT (to) = DECL_CONTEXT (decl);
372 /* Note that these fields may need to be updated from time to time from
373 the original decl. Consider:
374 extern __thread int i;
375 int foo() { return i; }
377 in which I goes from external to locally defined and initialized. */
379 TREE_STATIC (to) = TREE_STATIC (decl);
380 TREE_USED (to) = TREE_USED (decl);
381 TREE_PUBLIC (to) = TREE_PUBLIC (decl);
382 DECL_EXTERNAL (to) = DECL_EXTERNAL (decl);
383 DECL_COMMON (to) = DECL_COMMON (decl);
384 DECL_WEAK (to) = DECL_WEAK (decl);
385 DECL_VISIBILITY (to) = DECL_VISIBILITY (decl);
391 emutls_common_1 (void **loc, void *xstmts)
393 struct tree_map *h = *(struct tree_map **) loc;
394 tree args, x, *pstmts = (tree *) xstmts;
397 if (! DECL_COMMON (h->base.from)
398 || (DECL_INITIAL (h->base.from)
399 && DECL_INITIAL (h->base.from) != error_mark_node))
402 word_type_node = lang_hooks.types.type_for_mode (word_mode, 1);
404 /* The idea was to call get_emutls_init_templ_addr here, but if we
405 do this and there is an initializer, -fanchor_section loses,
406 because it would be too late to ensure the template is
408 x = null_pointer_node;
409 args = tree_cons (NULL, x, NULL);
410 x = build_int_cst (word_type_node, DECL_ALIGN_UNIT (h->base.from));
411 args = tree_cons (NULL, x, args);
412 x = fold_convert (word_type_node, DECL_SIZE_UNIT (h->base.from));
413 args = tree_cons (NULL, x, args);
414 x = build_fold_addr_expr (h->to);
415 args = tree_cons (NULL, x, args);
417 x = built_in_decls[BUILT_IN_EMUTLS_REGISTER_COMMON];
418 x = build_function_call_expr (x, args);
420 append_to_statement_list (x, pstmts);
427 tree body = NULL_TREE;
429 if (emutls_htab == NULL)
432 htab_traverse_noresize (emutls_htab, emutls_common_1, &body);
433 if (body == NULL_TREE)
436 cgraph_build_static_cdtor ('I', body, DEFAULT_INIT_PRIORITY);
439 /* Helper routines for maintaining section_htab. */
442 section_entry_eq (const void *p1, const void *p2)
444 const section *old = p1;
445 const char *new = p2;
447 return strcmp (old->named.name, new) == 0;
451 section_entry_hash (const void *p)
453 const section *old = p;
454 return htab_hash_string (old->named.name);
457 /* Return a hash value for section SECT. */
460 hash_section (section *sect)
462 if (sect->common.flags & SECTION_NAMED)
463 return htab_hash_string (sect->named.name);
464 return sect->common.flags;
467 /* Helper routines for maintaining object_block_htab. */
470 object_block_entry_eq (const void *p1, const void *p2)
472 const struct object_block *old = p1;
473 const section *new = p2;
475 return old->sect == new;
479 object_block_entry_hash (const void *p)
481 const struct object_block *old = p;
482 return hash_section (old->sect);
485 /* Return a new unnamed section with the given fields. */
488 get_unnamed_section (unsigned int flags, void (*callback) (const void *),
493 sect = ggc_alloc (sizeof (struct unnamed_section));
494 sect->unnamed.common.flags = flags | SECTION_UNNAMED;
495 sect->unnamed.callback = callback;
496 sect->unnamed.data = data;
497 sect->unnamed.next = unnamed_sections;
499 unnamed_sections = sect;
503 /* Return a SECTION_NOSWITCH section with the given fields. */
506 get_noswitch_section (unsigned int flags, noswitch_section_callback callback)
510 sect = ggc_alloc (sizeof (struct unnamed_section));
511 sect->noswitch.common.flags = flags | SECTION_NOSWITCH;
512 sect->noswitch.callback = callback;
517 /* Return the named section structure associated with NAME. Create
518 a new section with the given fields if no such structure exists. */
521 get_section (const char *name, unsigned int flags, tree decl)
523 section *sect, **slot;
526 htab_find_slot_with_hash (section_htab, name,
527 htab_hash_string (name), INSERT);
528 flags |= SECTION_NAMED;
531 sect = ggc_alloc (sizeof (struct named_section));
532 sect->named.common.flags = flags;
533 sect->named.name = ggc_strdup (name);
534 sect->named.decl = decl;
540 if ((sect->common.flags & ~SECTION_DECLARED) != flags
541 && ((sect->common.flags | flags) & SECTION_OVERRIDE) == 0)
543 /* Sanity check user variables for flag changes. */
545 decl = sect->named.decl;
547 error ("%+D causes a section type conflict", decl);
553 /* Return true if the current compilation mode benefits from having
554 objects grouped into blocks. */
557 use_object_blocks_p (void)
559 return flag_section_anchors;
562 /* Return the object_block structure for section SECT. Create a new
563 structure if we haven't created one already. Return null if SECT
566 static struct object_block *
567 get_block_for_section (section *sect)
569 struct object_block *block;
575 slot = htab_find_slot_with_hash (object_block_htab, sect,
576 hash_section (sect), INSERT);
577 block = (struct object_block *) *slot;
580 block = (struct object_block *)
581 ggc_alloc_cleared (sizeof (struct object_block));
588 /* Create a symbol with label LABEL and place it at byte offset
589 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
590 is not yet known. LABEL must be a garbage-collected string. */
593 create_block_symbol (const char *label, struct object_block *block,
594 HOST_WIDE_INT offset)
599 /* Create the extended SYMBOL_REF. */
600 size = RTX_HDR_SIZE + sizeof (struct block_symbol);
601 symbol = ggc_alloc_zone (size, &rtl_zone);
603 /* Initialize the normal SYMBOL_REF fields. */
604 memset (symbol, 0, size);
605 PUT_CODE (symbol, SYMBOL_REF);
606 PUT_MODE (symbol, Pmode);
607 XSTR (symbol, 0) = label;
608 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_HAS_BLOCK_INFO;
610 /* Initialize the block_symbol stuff. */
611 SYMBOL_REF_BLOCK (symbol) = block;
612 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
618 initialize_cold_section_name (void)
620 const char *stripped_name;
624 gcc_assert (cfun && current_function_decl);
625 if (cfun->unlikely_text_section_name)
628 dsn = DECL_SECTION_NAME (current_function_decl);
629 if (flag_function_sections && dsn)
631 name = alloca (TREE_STRING_LENGTH (dsn) + 1);
632 memcpy (name, TREE_STRING_POINTER (dsn), TREE_STRING_LENGTH (dsn) + 1);
634 stripped_name = targetm.strip_name_encoding (name);
636 buffer = ACONCAT ((stripped_name, "_unlikely", NULL));
637 cfun->unlikely_text_section_name = ggc_strdup (buffer);
640 cfun->unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
643 /* Tell assembler to switch to unlikely-to-be-executed text section. */
646 unlikely_text_section (void)
650 if (!cfun->unlikely_text_section_name)
651 initialize_cold_section_name ();
653 return get_named_section (NULL, cfun->unlikely_text_section_name, 0);
656 return get_named_section (NULL, UNLIKELY_EXECUTED_TEXT_SECTION_NAME, 0);
659 /* When called within a function context, return true if the function
660 has been assigned a cold text section and if SECT is that section.
661 When called outside a function context, return true if SECT is the
662 default cold section. */
665 unlikely_text_section_p (section *sect)
670 name = cfun->unlikely_text_section_name;
672 name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
676 && SECTION_STYLE (sect) == SECTION_NAMED
677 && strcmp (name, sect->named.name) == 0);
680 /* Return a section with a particular name and with whatever SECTION_*
681 flags section_type_flags deems appropriate. The name of the section
682 is taken from NAME if nonnull, otherwise it is taken from DECL's
683 DECL_SECTION_NAME. DECL is the decl associated with the section
684 (see the section comment for details) and RELOC is as for
685 section_type_flags. */
688 get_named_section (tree decl, const char *name, int reloc)
692 gcc_assert (!decl || DECL_P (decl));
694 name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
696 flags = targetm.section_type_flags (decl, name, reloc);
698 return get_section (name, flags, decl);
701 /* If required, set DECL_SECTION_NAME to a unique name. */
704 resolve_unique_section (tree decl, int reloc ATTRIBUTE_UNUSED,
705 int flag_function_or_data_sections)
707 if (DECL_SECTION_NAME (decl) == NULL_TREE
708 && targetm.have_named_sections
709 && (flag_function_or_data_sections
710 || DECL_ONE_ONLY (decl)))
711 targetm.asm_out.unique_section (decl, reloc);
714 #ifdef BSS_SECTION_ASM_OP
716 #ifdef ASM_OUTPUT_BSS
718 /* Utility function for ASM_OUTPUT_BSS for targets to use if
719 they don't support alignments in .bss.
720 ??? It is believed that this function will work in most cases so such
721 support is localized here. */
724 asm_output_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
726 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
727 unsigned HOST_WIDE_INT rounded)
729 gcc_assert (strcmp (XSTR (XEXP (DECL_RTL (decl), 0), 0), name) == 0);
730 targetm.asm_out.globalize_decl_name (file, decl);
731 switch_to_section (bss_section);
732 #ifdef ASM_DECLARE_OBJECT_NAME
733 last_assemble_variable_decl = decl;
734 ASM_DECLARE_OBJECT_NAME (file, name, decl);
736 /* Standard thing is just output label for the object. */
737 ASM_OUTPUT_LABEL (file, name);
738 #endif /* ASM_DECLARE_OBJECT_NAME */
739 ASM_OUTPUT_SKIP (file, rounded ? rounded : 1);
744 #ifdef ASM_OUTPUT_ALIGNED_BSS
746 /* Utility function for targets to use in implementing
747 ASM_OUTPUT_ALIGNED_BSS.
748 ??? It is believed that this function will work in most cases so such
749 support is localized here. */
752 asm_output_aligned_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
753 const char *name, unsigned HOST_WIDE_INT size,
756 switch_to_section (bss_section);
757 ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
758 #ifdef ASM_DECLARE_OBJECT_NAME
759 last_assemble_variable_decl = decl;
760 ASM_DECLARE_OBJECT_NAME (file, name, decl);
762 /* Standard thing is just output label for the object. */
763 ASM_OUTPUT_LABEL (file, name);
764 #endif /* ASM_DECLARE_OBJECT_NAME */
765 ASM_OUTPUT_SKIP (file, size ? size : 1);
770 #endif /* BSS_SECTION_ASM_OP */
772 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
773 /* Return the hot section for function DECL. Return text_section for
777 hot_function_section (tree decl)
779 if (decl != NULL_TREE
780 && DECL_SECTION_NAME (decl) != NULL_TREE
781 && targetm.have_named_sections)
782 return get_named_section (decl, NULL, 0);
788 /* Return the section for function DECL.
790 If DECL is NULL_TREE, return the text section. We can be passed
791 NULL_TREE under some circumstances by dbxout.c at least. */
794 function_section (tree decl)
798 if (first_function_block_is_cold)
801 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
802 if (decl != NULL_TREE
803 && DECL_SECTION_NAME (decl) != NULL_TREE)
804 return reloc ? unlikely_text_section ()
805 : get_named_section (decl, NULL, 0);
807 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
809 return reloc ? unlikely_text_section () : hot_function_section (decl);
814 current_function_section (void)
816 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
817 if (current_function_decl != NULL_TREE
818 && DECL_SECTION_NAME (current_function_decl) != NULL_TREE)
819 return in_cold_section_p ? unlikely_text_section ()
820 : get_named_section (current_function_decl,
823 return targetm.asm_out.select_section (current_function_decl,
825 DECL_ALIGN (current_function_decl));
827 return (in_cold_section_p
828 ? unlikely_text_section ()
829 : hot_function_section (current_function_decl));
833 /* Return the read-only data section associated with function DECL. */
836 default_function_rodata_section (tree decl)
838 if (decl != NULL_TREE && DECL_SECTION_NAME (decl))
840 const char *name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
842 if (DECL_ONE_ONLY (decl) && HAVE_COMDAT_GROUP)
844 size_t len = strlen (name) + 3;
845 char* rname = alloca (len);
847 strcpy (rname, ".rodata");
848 strcat (rname, name + 5);
849 return get_section (rname, SECTION_LINKONCE, decl);
851 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
852 else if (DECL_ONE_ONLY (decl)
853 && strncmp (name, ".gnu.linkonce.t.", 16) == 0)
855 size_t len = strlen (name) + 1;
856 char *rname = alloca (len);
858 memcpy (rname, name, len);
860 return get_section (rname, SECTION_LINKONCE, decl);
862 /* For .text.foo we want to use .rodata.foo. */
863 else if (flag_function_sections && flag_data_sections
864 && strncmp (name, ".text.", 6) == 0)
866 size_t len = strlen (name) + 1;
867 char *rname = alloca (len + 2);
869 memcpy (rname, ".rodata", 7);
870 memcpy (rname + 7, name + 5, len - 5);
871 return get_section (rname, 0, decl);
875 return readonly_data_section;
878 /* Return the read-only data section associated with function DECL
879 for targets where that section should be always the single
880 readonly data section. */
883 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED)
885 return readonly_data_section;
888 /* Return the section to use for string merging. */
891 mergeable_string_section (tree decl ATTRIBUTE_UNUSED,
892 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
893 unsigned int flags ATTRIBUTE_UNUSED)
897 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
898 && TREE_CODE (decl) == STRING_CST
899 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
901 && (len = int_size_in_bytes (TREE_TYPE (decl))) > 0
902 && TREE_STRING_LENGTH (decl) >= len)
904 enum machine_mode mode;
905 unsigned int modesize;
911 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
912 modesize = GET_MODE_BITSIZE (mode);
913 if (modesize >= 8 && modesize <= 256
914 && (modesize & (modesize - 1)) == 0)
916 if (align < modesize)
919 str = TREE_STRING_POINTER (decl);
920 unit = GET_MODE_SIZE (mode);
922 /* Check for embedded NUL characters. */
923 for (i = 0; i < len; i += unit)
925 for (j = 0; j < unit; j++)
926 if (str[i + j] != '\0')
933 sprintf (name, ".rodata.str%d.%d", modesize / 8,
935 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
936 return get_section (name, flags, NULL);
941 return readonly_data_section;
944 /* Return the section to use for constant merging. */
947 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED,
948 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
949 unsigned int flags ATTRIBUTE_UNUSED)
951 unsigned int modesize = GET_MODE_BITSIZE (mode);
953 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
959 && (align & (align - 1)) == 0)
963 sprintf (name, ".rodata.cst%d", (int) (align / 8));
964 flags |= (align / 8) | SECTION_MERGE;
965 return get_section (name, flags, NULL);
967 return readonly_data_section;
970 /* Given NAME, a putative register name, discard any customary prefixes. */
973 strip_reg_name (const char *name)
975 #ifdef REGISTER_PREFIX
976 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
977 name += strlen (REGISTER_PREFIX);
979 if (name[0] == '%' || name[0] == '#')
984 /* The user has asked for a DECL to have a particular name. Set (or
985 change) it in such a way that we don't prefix an underscore to
988 set_user_assembler_name (tree decl, const char *name)
990 char *starred = alloca (strlen (name) + 2);
992 strcpy (starred + 1, name);
993 change_decl_assembler_name (decl, get_identifier (starred));
994 SET_DECL_RTL (decl, NULL_RTX);
997 /* Decode an `asm' spec for a declaration as a register name.
998 Return the register number, or -1 if nothing specified,
999 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
1000 or -3 if ASMSPEC is `cc' and is not recognized,
1001 or -4 if ASMSPEC is `memory' and is not recognized.
1002 Accept an exact spelling or a decimal number.
1003 Prefixes such as % are optional. */
1006 decode_reg_name (const char *asmspec)
1012 /* Get rid of confusing prefixes. */
1013 asmspec = strip_reg_name (asmspec);
1015 /* Allow a decimal number as a "register name". */
1016 for (i = strlen (asmspec) - 1; i >= 0; i--)
1017 if (! ISDIGIT (asmspec[i]))
1019 if (asmspec[0] != 0 && i < 0)
1022 if (i < FIRST_PSEUDO_REGISTER && i >= 0)
1028 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
1030 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
1033 #ifdef ADDITIONAL_REGISTER_NAMES
1035 static const struct { const char *const name; const int number; } table[]
1036 = ADDITIONAL_REGISTER_NAMES;
1038 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
1039 if (table[i].name[0]
1040 && ! strcmp (asmspec, table[i].name))
1041 return table[i].number;
1043 #endif /* ADDITIONAL_REGISTER_NAMES */
1045 if (!strcmp (asmspec, "memory"))
1048 if (!strcmp (asmspec, "cc"))
1057 /* Return true if DECL's initializer is suitable for a BSS section. */
1060 bss_initializer_p (tree decl)
1062 return (DECL_INITIAL (decl) == NULL
1063 || DECL_INITIAL (decl) == error_mark_node
1064 || (flag_zero_initialized_in_bss
1065 /* Leave constant zeroes in .rodata so they
1067 && !TREE_READONLY (decl)
1068 && initializer_zerop (DECL_INITIAL (decl))));
1071 /* Compute the alignment of variable specified by DECL.
1072 DONT_OUTPUT_DATA is from assemble_variable. */
1075 align_variable (tree decl, bool dont_output_data)
1077 unsigned int align = DECL_ALIGN (decl);
1079 /* In the case for initialing an array whose length isn't specified,
1080 where we have not yet been able to do the layout,
1081 figure out the proper alignment now. */
1082 if (dont_output_data && DECL_SIZE (decl) == 0
1083 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
1084 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
1086 /* Some object file formats have a maximum alignment which they support.
1087 In particular, a.out format supports a maximum alignment of 4. */
1088 if (align > MAX_OFILE_ALIGNMENT)
1090 warning (0, "alignment of %q+D is greater than maximum object "
1091 "file alignment. Using %d", decl,
1092 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
1093 align = MAX_OFILE_ALIGNMENT;
1096 /* On some machines, it is good to increase alignment sometimes. */
1097 if (! DECL_USER_ALIGN (decl))
1099 #ifdef DATA_ALIGNMENT
1100 unsigned int data_align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1101 /* Don't increase alignment too much for TLS variables - TLS space
1103 if (! DECL_THREAD_LOCAL_P (decl) || data_align <= BITS_PER_WORD)
1106 #ifdef CONSTANT_ALIGNMENT
1107 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
1109 unsigned int const_align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl),
1111 /* Don't increase alignment too much for TLS variables - TLS space
1113 if (! DECL_THREAD_LOCAL_P (decl) || const_align <= BITS_PER_WORD)
1114 align = const_align;
1119 /* Reset the alignment in case we have made it tighter, so we can benefit
1120 from it in get_pointer_alignment. */
1121 DECL_ALIGN (decl) = align;
1124 /* Return the section into which the given VAR_DECL or CONST_DECL
1125 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1126 section should be used wherever possible. */
1129 get_variable_section (tree decl, bool prefer_noswitch_p)
1133 /* If the decl has been given an explicit section name, then it
1134 isn't common, and shouldn't be handled as such. */
1135 if (DECL_COMMON (decl) && DECL_SECTION_NAME (decl) == NULL)
1137 if (DECL_THREAD_LOCAL_P (decl))
1138 return tls_comm_section;
1139 if (TREE_PUBLIC (decl) && bss_initializer_p (decl))
1140 return comm_section;
1143 if (DECL_INITIAL (decl) == error_mark_node)
1144 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
1145 else if (DECL_INITIAL (decl))
1146 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
1150 resolve_unique_section (decl, reloc, flag_data_sections);
1151 if (IN_NAMED_SECTION (decl))
1152 return get_named_section (decl, NULL, reloc);
1154 if (!DECL_THREAD_LOCAL_P (decl)
1155 && !(prefer_noswitch_p && targetm.have_switchable_bss_sections)
1156 && bss_initializer_p (decl))
1158 if (!TREE_PUBLIC (decl))
1159 return lcomm_section;
1160 if (bss_noswitch_section)
1161 return bss_noswitch_section;
1164 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
1167 /* Return the block into which object_block DECL should be placed. */
1169 static struct object_block *
1170 get_block_for_decl (tree decl)
1174 if (TREE_CODE (decl) == VAR_DECL)
1176 /* The object must be defined in this translation unit. */
1177 if (DECL_EXTERNAL (decl))
1180 /* There's no point using object blocks for something that is
1181 isolated by definition. */
1182 if (DECL_ONE_ONLY (decl))
1186 /* We can only calculate block offsets if the decl has a known
1188 if (DECL_SIZE_UNIT (decl) == NULL)
1190 if (!host_integerp (DECL_SIZE_UNIT (decl), 1))
1193 /* Find out which section should contain DECL. We cannot put it into
1194 an object block if it requires a standalone definition. */
1195 if (TREE_CODE (decl) == VAR_DECL)
1196 align_variable (decl, 0);
1197 sect = get_variable_section (decl, true);
1198 if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
1201 return get_block_for_section (sect);
1204 /* Make sure block symbol SYMBOL is in block BLOCK. */
1207 change_symbol_block (rtx symbol, struct object_block *block)
1209 if (block != SYMBOL_REF_BLOCK (symbol))
1211 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
1212 SYMBOL_REF_BLOCK (symbol) = block;
1216 /* Return true if it is possible to put DECL in an object_block. */
1219 use_blocks_for_decl_p (tree decl)
1221 /* Only data DECLs can be placed into object blocks. */
1222 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
1225 /* Detect decls created by dw2_force_const_mem. Such decls are
1226 special because DECL_INITIAL doesn't specify the decl's true value.
1227 dw2_output_indirect_constants will instead call assemble_variable
1228 with dont_output_data set to 1 and then print the contents itself. */
1229 if (DECL_INITIAL (decl) == decl)
1232 /* If this decl is an alias, then we don't want to emit a definition. */
1233 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl)))
1239 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1240 have static storage duration. In other words, it should not be an
1241 automatic variable, including PARM_DECLs.
1243 There is, however, one exception: this function handles variables
1244 explicitly placed in a particular register by the user.
1246 This is never called for PARM_DECL nodes. */
1249 make_decl_rtl (tree decl)
1251 const char *name = 0;
1255 /* Check that we are not being given an automatic variable. */
1256 gcc_assert (TREE_CODE (decl) != PARM_DECL
1257 && TREE_CODE (decl) != RESULT_DECL);
1259 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1260 gcc_assert (TREE_CODE (decl) != VAR_DECL
1261 || TREE_STATIC (decl)
1262 || TREE_PUBLIC (decl)
1263 || DECL_EXTERNAL (decl)
1264 || DECL_REGISTER (decl));
1266 /* And that we were not given a type or a label. */
1267 gcc_assert (TREE_CODE (decl) != TYPE_DECL
1268 && TREE_CODE (decl) != LABEL_DECL);
1270 /* For a duplicate declaration, we can be called twice on the
1271 same DECL node. Don't discard the RTL already made. */
1272 if (DECL_RTL_SET_P (decl))
1274 /* If the old RTL had the wrong mode, fix the mode. */
1275 x = DECL_RTL (decl);
1276 if (GET_MODE (x) != DECL_MODE (decl))
1277 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
1279 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1282 /* ??? Another way to do this would be to maintain a hashed
1283 table of such critters. Instead of adding stuff to a DECL
1284 to give certain attributes to it, we could use an external
1285 hash map from DECL to set of attributes. */
1287 /* Let the target reassign the RTL if it wants.
1288 This is necessary, for example, when one machine specific
1289 decl attribute overrides another. */
1290 targetm.encode_section_info (decl, DECL_RTL (decl), false);
1292 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1293 on the new decl information. */
1295 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
1296 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x, 0)))
1297 change_symbol_block (XEXP (x, 0), get_block_for_decl (decl));
1299 /* Make this function static known to the mudflap runtime. */
1300 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1301 mudflap_enqueue_decl (decl);
1306 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1308 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
1309 && DECL_REGISTER (decl))
1311 error ("register name not specified for %q+D", decl);
1313 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1315 const char *asmspec = name+1;
1316 reg_number = decode_reg_name (asmspec);
1317 /* First detect errors in declaring global registers. */
1318 if (reg_number == -1)
1319 error ("register name not specified for %q+D", decl);
1320 else if (reg_number < 0)
1321 error ("invalid register name for %q+D", decl);
1322 else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
1323 error ("data type of %q+D isn%'t suitable for a register",
1325 else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
1326 error ("register specified for %q+D isn%'t suitable for data type",
1328 /* Now handle properly declared static register variables. */
1333 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
1335 DECL_INITIAL (decl) = 0;
1336 error ("global register variable has initial value");
1338 if (TREE_THIS_VOLATILE (decl))
1339 warning (OPT_Wvolatile_register_var,
1340 "optimization may eliminate reads and/or "
1341 "writes to register variables");
1343 /* If the user specified one of the eliminables registers here,
1344 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1345 confused with that register and be eliminated. This usage is
1346 somewhat suspect... */
1348 SET_DECL_RTL (decl, gen_rtx_raw_REG (DECL_MODE (decl), reg_number));
1349 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
1350 REG_USERVAR_P (DECL_RTL (decl)) = 1;
1352 if (TREE_STATIC (decl))
1354 /* Make this register global, so not usable for anything
1356 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1357 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1358 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1360 nregs = hard_regno_nregs[reg_number][DECL_MODE (decl)];
1362 globalize_reg (reg_number + --nregs);
1365 /* As a register variable, it has no section. */
1369 /* Now handle ordinary static variables and functions (in memory).
1370 Also handle vars declared register invalidly. */
1371 else if (name[0] == '*')
1373 #ifdef REGISTER_PREFIX
1374 if (strlen (REGISTER_PREFIX) != 0)
1376 reg_number = decode_reg_name (name);
1377 if (reg_number >= 0 || reg_number == -3)
1378 error ("register name given for non-register variable %q+D", decl);
1383 /* Specifying a section attribute on a variable forces it into a
1384 non-.bss section, and thus it cannot be common. */
1385 if (TREE_CODE (decl) == VAR_DECL
1386 && DECL_SECTION_NAME (decl) != NULL_TREE
1387 && DECL_INITIAL (decl) == NULL_TREE
1388 && DECL_COMMON (decl))
1389 DECL_COMMON (decl) = 0;
1391 /* Variables can't be both common and weak. */
1392 if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl))
1393 DECL_COMMON (decl) = 0;
1395 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1396 x = create_block_symbol (name, get_block_for_decl (decl), -1);
1398 x = gen_rtx_SYMBOL_REF (Pmode, name);
1399 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1400 SET_SYMBOL_REF_DECL (x, decl);
1402 x = gen_rtx_MEM (DECL_MODE (decl), x);
1403 if (TREE_CODE (decl) != FUNCTION_DECL)
1404 set_mem_attributes (x, decl, 1);
1405 SET_DECL_RTL (decl, x);
1407 /* Optionally set flags or add text to the name to record information
1408 such as that it is a function name.
1409 If the name is changed, the macro ASM_OUTPUT_LABELREF
1410 will have to know how to strip this information. */
1411 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1413 /* Make this function static known to the mudflap runtime. */
1414 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1415 mudflap_enqueue_decl (decl);
1418 /* Output a string of literal assembler code
1419 for an `asm' keyword used between functions. */
1422 assemble_asm (tree string)
1426 if (TREE_CODE (string) == ADDR_EXPR)
1427 string = TREE_OPERAND (string, 0);
1429 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
1432 /* Record an element in the table of global destructors. SYMBOL is
1433 a SYMBOL_REF of the function to be called; PRIORITY is a number
1434 between 0 and MAX_INIT_PRIORITY. */
1437 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED,
1438 int priority ATTRIBUTE_UNUSED)
1440 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1441 /* Tell GNU LD that this is part of the static destructor set.
1442 This will work for any system that uses stabs, most usefully
1444 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1445 dbxout_stab_value_label (XSTR (symbol, 0));
1447 sorry ("global destructors not supported on this target");
1451 /* Write the address of the entity given by SYMBOL to SEC. */
1453 assemble_addr_to_section (rtx symbol, section *sec)
1455 switch_to_section (sec);
1456 assemble_align (POINTER_SIZE);
1457 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1460 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1461 not) section for PRIORITY. */
1463 get_cdtor_priority_section (int priority, bool constructor_p)
1467 /* ??? This only works reliably with the GNU linker. */
1468 sprintf (buf, "%s.%.5u",
1469 constructor_p ? ".ctors" : ".dtors",
1470 /* Invert the numbering so the linker puts us in the proper
1471 order; constructors are run from right to left, and the
1472 linker sorts in increasing order. */
1473 MAX_INIT_PRIORITY - priority);
1474 return get_section (buf, SECTION_WRITE, NULL);
1478 default_named_section_asm_out_destructor (rtx symbol, int priority)
1482 if (priority != DEFAULT_INIT_PRIORITY)
1483 sec = get_cdtor_priority_section (priority,
1484 /*constructor_p=*/false);
1486 sec = get_section (".dtors", SECTION_WRITE, NULL);
1488 assemble_addr_to_section (symbol, sec);
1491 #ifdef DTORS_SECTION_ASM_OP
1493 default_dtor_section_asm_out_destructor (rtx symbol,
1494 int priority ATTRIBUTE_UNUSED)
1496 assemble_addr_to_section (symbol, dtors_section);
1500 /* Likewise for global constructors. */
1503 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED,
1504 int priority ATTRIBUTE_UNUSED)
1506 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1507 /* Tell GNU LD that this is part of the static destructor set.
1508 This will work for any system that uses stabs, most usefully
1510 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1511 dbxout_stab_value_label (XSTR (symbol, 0));
1513 sorry ("global constructors not supported on this target");
1518 default_named_section_asm_out_constructor (rtx symbol, int priority)
1522 if (priority != DEFAULT_INIT_PRIORITY)
1523 sec = get_cdtor_priority_section (priority,
1524 /*constructor_p=*/true);
1526 sec = get_section (".ctors", SECTION_WRITE, NULL);
1528 assemble_addr_to_section (symbol, sec);
1531 #ifdef CTORS_SECTION_ASM_OP
1533 default_ctor_section_asm_out_constructor (rtx symbol,
1534 int priority ATTRIBUTE_UNUSED)
1536 assemble_addr_to_section (symbol, ctors_section);
1540 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1541 a nonzero value if the constant pool should be output before the
1542 start of the function, or a zero value if the pool should output
1543 after the end of the function. The default is to put it before the
1546 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1547 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1550 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1551 to be output to assembler.
1552 Set first_global_object_name and weak_global_object_name as appropriate. */
1555 notice_global_symbol (tree decl)
1557 const char **type = &first_global_object_name;
1559 if (first_global_object_name
1560 || !TREE_PUBLIC (decl)
1561 || DECL_EXTERNAL (decl)
1562 || !DECL_NAME (decl)
1563 || (TREE_CODE (decl) != FUNCTION_DECL
1564 && (TREE_CODE (decl) != VAR_DECL
1565 || (DECL_COMMON (decl)
1566 && (DECL_INITIAL (decl) == 0
1567 || DECL_INITIAL (decl) == error_mark_node))))
1568 || !MEM_P (DECL_RTL (decl)))
1571 /* We win when global object is found, but it is useful to know about weak
1572 symbol as well so we can produce nicer unique names. */
1573 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl) || flag_shlib)
1574 type = &weak_global_object_name;
1580 rtx decl_rtl = DECL_RTL (decl);
1582 p = targetm.strip_name_encoding (XSTR (XEXP (decl_rtl, 0), 0));
1583 name = ggc_strdup (p);
1589 /* Output assembler code for the constant pool of a function and associated
1590 with defining the name of the function. DECL describes the function.
1591 NAME is the function's name. For the constant pool, we use the current
1592 constant pool data. */
1595 assemble_start_function (tree decl, const char *fnname)
1598 char tmp_label[100];
1599 bool hot_label_written = false;
1601 cfun->unlikely_text_section_name = NULL;
1603 first_function_block_is_cold = false;
1604 if (flag_reorder_blocks_and_partition)
1606 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1607 cfun->hot_section_label = ggc_strdup (tmp_label);
1608 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1609 cfun->cold_section_label = ggc_strdup (tmp_label);
1610 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1611 cfun->hot_section_end_label = ggc_strdup (tmp_label);
1612 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1613 cfun->cold_section_end_label = ggc_strdup (tmp_label);
1618 cfun->hot_section_label = NULL;
1619 cfun->cold_section_label = NULL;
1620 cfun->hot_section_end_label = NULL;
1621 cfun->cold_section_end_label = NULL;
1624 /* The following code does not need preprocessing in the assembler. */
1628 if (CONSTANT_POOL_BEFORE_FUNCTION)
1629 output_constant_pool (fnname, decl);
1631 resolve_unique_section (decl, 0, flag_function_sections);
1633 /* Make sure the not and cold text (code) sections are properly
1634 aligned. This is necessary here in the case where the function
1635 has both hot and cold sections, because we don't want to re-set
1636 the alignment when the section switch happens mid-function. */
1638 if (flag_reorder_blocks_and_partition)
1640 switch_to_section (unlikely_text_section ());
1641 assemble_align (DECL_ALIGN (decl));
1642 ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_label);
1644 /* When the function starts with a cold section, we need to explicitly
1645 align the hot section and write out the hot section label.
1646 But if the current function is a thunk, we do not have a CFG. */
1647 if (!current_function_is_thunk
1648 && BB_PARTITION (ENTRY_BLOCK_PTR->next_bb) == BB_COLD_PARTITION)
1650 switch_to_section (text_section);
1651 assemble_align (DECL_ALIGN (decl));
1652 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_label);
1653 hot_label_written = true;
1654 first_function_block_is_cold = true;
1657 else if (DECL_SECTION_NAME (decl))
1659 /* Calls to function_section rely on first_function_block_is_cold
1660 being accurate. The first block may be cold even if we aren't
1661 doing partitioning, if the entire function was decided by
1662 choose_function_section (predict.c) to be cold. */
1664 initialize_cold_section_name ();
1666 if (cfun->unlikely_text_section_name
1667 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
1668 cfun->unlikely_text_section_name) == 0)
1669 first_function_block_is_cold = true;
1672 in_cold_section_p = first_function_block_is_cold;
1674 /* Switch to the correct text section for the start of the function. */
1676 switch_to_section (function_section (decl));
1677 if (flag_reorder_blocks_and_partition
1678 && !hot_label_written)
1679 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_label);
1681 /* Tell assembler to move to target machine's alignment for functions. */
1682 align = floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT);
1685 ASM_OUTPUT_ALIGN (asm_out_file, align);
1688 /* Handle a user-specified function alignment.
1689 Note that we still need to align to DECL_ALIGN, as above,
1690 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1691 if (! DECL_USER_ALIGN (decl)
1692 && align_functions_log > align
1693 && cfun->function_frequency != FUNCTION_FREQUENCY_UNLIKELY_EXECUTED)
1695 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1696 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1697 align_functions_log, align_functions - 1);
1699 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1703 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1704 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1707 (*debug_hooks->begin_function) (decl);
1709 /* Make function name accessible from other files, if appropriate. */
1711 if (TREE_PUBLIC (decl))
1713 notice_global_symbol (decl);
1715 globalize_decl (decl);
1717 maybe_assemble_visibility (decl);
1720 if (DECL_PRESERVE_P (decl))
1721 targetm.asm_out.mark_decl_preserved (fnname);
1723 /* Do any machine/system dependent processing of the function name. */
1724 #ifdef ASM_DECLARE_FUNCTION_NAME
1725 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1727 /* Standard thing is just output label for the function. */
1728 ASM_OUTPUT_LABEL (asm_out_file, fnname);
1729 #endif /* ASM_DECLARE_FUNCTION_NAME */
1732 /* Output assembler code associated with defining the size of the
1733 function. DECL describes the function. NAME is the function's name. */
1736 assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
1738 #ifdef ASM_DECLARE_FUNCTION_SIZE
1739 /* We could have switched section in the middle of the function. */
1740 if (flag_reorder_blocks_and_partition)
1741 switch_to_section (function_section (decl));
1742 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1744 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1746 output_constant_pool (fnname, decl);
1747 switch_to_section (function_section (decl)); /* need to switch back */
1749 /* Output labels for end of hot/cold text sections (to be used by
1751 if (flag_reorder_blocks_and_partition)
1753 section *save_text_section;
1755 save_text_section = in_section;
1756 switch_to_section (unlikely_text_section ());
1757 ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_end_label);
1758 if (first_function_block_is_cold)
1759 switch_to_section (text_section);
1761 switch_to_section (function_section (decl));
1762 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_end_label);
1763 switch_to_section (save_text_section);
1767 /* Assemble code to leave SIZE bytes of zeros. */
1770 assemble_zeros (unsigned HOST_WIDE_INT size)
1772 /* Do no output if -fsyntax-only. */
1773 if (flag_syntax_only)
1776 #ifdef ASM_NO_SKIP_IN_TEXT
1777 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1778 so we must output 0s explicitly in the text section. */
1779 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1781 unsigned HOST_WIDE_INT i;
1782 for (i = 0; i < size; i++)
1783 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1788 ASM_OUTPUT_SKIP (asm_out_file, size);
1791 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1794 assemble_align (int align)
1796 if (align > BITS_PER_UNIT)
1798 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1802 /* Assemble a string constant with the specified C string as contents. */
1805 assemble_string (const char *p, int size)
1810 /* If the string is very long, split it up. */
1814 int thissize = size - pos;
1815 if (thissize > maximum)
1818 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1826 /* A noswitch_section_callback for lcomm_section. */
1829 emit_local (tree decl ATTRIBUTE_UNUSED,
1830 const char *name ATTRIBUTE_UNUSED,
1831 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1832 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1834 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1835 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name,
1836 size, DECL_ALIGN (decl));
1838 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1839 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl));
1842 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1847 /* A noswitch_section_callback for bss_noswitch_section. */
1849 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1851 emit_bss (tree decl ATTRIBUTE_UNUSED,
1852 const char *name ATTRIBUTE_UNUSED,
1853 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1854 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1856 #if defined ASM_OUTPUT_ALIGNED_BSS
1857 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl));
1860 ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded);
1866 /* A noswitch_section_callback for comm_section. */
1869 emit_common (tree decl ATTRIBUTE_UNUSED,
1870 const char *name ATTRIBUTE_UNUSED,
1871 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1872 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1874 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1875 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name,
1876 size, DECL_ALIGN (decl));
1878 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1879 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl));
1882 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1887 /* A noswitch_section_callback for tls_comm_section. */
1890 emit_tls_common (tree decl ATTRIBUTE_UNUSED,
1891 const char *name ATTRIBUTE_UNUSED,
1892 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1893 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1895 #ifdef ASM_OUTPUT_TLS_COMMON
1896 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1899 sorry ("thread-local COMMON data not implemented");
1904 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1905 NAME is the name of DECL's SYMBOL_REF. */
1908 assemble_noswitch_variable (tree decl, const char *name, section *sect)
1910 unsigned HOST_WIDE_INT size, rounded;
1912 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1915 /* Don't allocate zero bytes of common,
1916 since that means "undefined external" in the linker. */
1920 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1921 so that each uninitialized object starts on such a boundary. */
1922 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
1923 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1924 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1926 if (!sect->noswitch.callback (decl, name, size, rounded)
1927 && (unsigned HOST_WIDE_INT) DECL_ALIGN_UNIT (decl) > rounded)
1928 warning (0, "requested alignment for %q+D is greater than "
1929 "implemented alignment of %wu", decl, rounded);
1932 /* A subroutine of assemble_variable. Output the label and contents of
1933 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1934 is as for assemble_variable. */
1937 assemble_variable_contents (tree decl, const char *name,
1938 bool dont_output_data)
1940 /* Do any machine/system dependent processing of the object. */
1941 #ifdef ASM_DECLARE_OBJECT_NAME
1942 last_assemble_variable_decl = decl;
1943 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
1945 /* Standard thing is just output label for the object. */
1946 ASM_OUTPUT_LABEL (asm_out_file, name);
1947 #endif /* ASM_DECLARE_OBJECT_NAME */
1949 if (!dont_output_data)
1951 if (DECL_INITIAL (decl)
1952 && DECL_INITIAL (decl) != error_mark_node
1953 && !initializer_zerop (DECL_INITIAL (decl)))
1954 /* Output the actual data. */
1955 output_constant (DECL_INITIAL (decl),
1956 tree_low_cst (DECL_SIZE_UNIT (decl), 1),
1959 /* Leave space for it. */
1960 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
1964 /* Assemble everything that is needed for a variable or function declaration.
1965 Not used for automatic variables, and not used for function definitions.
1966 Should not be called for variables of incomplete structure type.
1968 TOP_LEVEL is nonzero if this variable has file scope.
1969 AT_END is nonzero if this is the special handling, at end of compilation,
1970 to define things that have had only tentative definitions.
1971 DONT_OUTPUT_DATA if nonzero means don't actually output the
1972 initial value (that will be done by the caller). */
1975 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
1976 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
1979 rtx decl_rtl, symbol;
1982 if (! targetm.have_tls
1983 && TREE_CODE (decl) == VAR_DECL
1984 && DECL_THREAD_LOCAL_P (decl))
1986 tree to = emutls_decl (decl);
1988 /* If this variable is defined locally, then we need to initialize the
1989 control structure with size and alignment information. We do this
1990 at the last moment because tentative definitions can take a locally
1991 defined but uninitialized variable and initialize it later, which
1992 would result in incorrect contents. */
1993 if (! DECL_EXTERNAL (to)
1994 && (! DECL_COMMON (to)
1995 || (DECL_INITIAL (decl)
1996 && DECL_INITIAL (decl) != error_mark_node)))
1998 VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 4);
1999 constructor_elt *elt;
2000 tree type = TREE_TYPE (to);
2001 tree field = TYPE_FIELDS (type);
2003 elt = VEC_quick_push (constructor_elt, v, NULL);
2005 elt->value = fold_convert (TREE_TYPE (field), DECL_SIZE_UNIT (decl));
2007 elt = VEC_quick_push (constructor_elt, v, NULL);
2008 field = TREE_CHAIN (field);
2010 elt->value = build_int_cst (TREE_TYPE (field),
2011 DECL_ALIGN_UNIT (decl));
2013 elt = VEC_quick_push (constructor_elt, v, NULL);
2014 field = TREE_CHAIN (field);
2016 elt->value = null_pointer_node;
2018 elt = VEC_quick_push (constructor_elt, v, NULL);
2019 field = TREE_CHAIN (field);
2021 elt->value = get_emutls_init_templ_addr (decl);
2023 DECL_INITIAL (to) = build_constructor (type, v);
2025 /* Make sure the template is marked as needed early enough.
2026 Without this, if the variable is placed in a
2027 section-anchored block, the template will only be marked
2028 when it's too late. */
2029 record_references_in_initializer (to);
2035 last_assemble_variable_decl = 0;
2037 /* Normally no need to say anything here for external references,
2038 since assemble_external is called by the language-specific code
2039 when a declaration is first seen. */
2041 if (DECL_EXTERNAL (decl))
2044 /* Output no assembler code for a function declaration.
2045 Only definitions of functions output anything. */
2047 if (TREE_CODE (decl) == FUNCTION_DECL)
2050 /* Do nothing for global register variables. */
2051 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
2053 TREE_ASM_WRITTEN (decl) = 1;
2057 /* If type was incomplete when the variable was declared,
2058 see if it is complete now. */
2060 if (DECL_SIZE (decl) == 0)
2061 layout_decl (decl, 0);
2063 /* Still incomplete => don't allocate it; treat the tentative defn
2064 (which is what it must have been) as an `extern' reference. */
2066 if (!dont_output_data && DECL_SIZE (decl) == 0)
2068 error ("storage size of %q+D isn%'t known", decl);
2069 TREE_ASM_WRITTEN (decl) = 1;
2073 /* The first declaration of a variable that comes through this function
2074 decides whether it is global (in C, has external linkage)
2075 or local (in C, has internal linkage). So do nothing more
2076 if this function has already run. */
2078 if (TREE_ASM_WRITTEN (decl))
2081 /* Make sure targetm.encode_section_info is invoked before we set
2083 decl_rtl = DECL_RTL (decl);
2085 TREE_ASM_WRITTEN (decl) = 1;
2087 /* Do no output if -fsyntax-only. */
2088 if (flag_syntax_only)
2093 if (! dont_output_data
2094 && ! host_integerp (DECL_SIZE_UNIT (decl), 1))
2096 error ("size of variable %q+D is too large", decl);
2100 gcc_assert (MEM_P (decl_rtl));
2101 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
2102 symbol = XEXP (decl_rtl, 0);
2103 name = XSTR (symbol, 0);
2104 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
2105 notice_global_symbol (decl);
2107 /* Compute the alignment of this data. */
2109 align_variable (decl, dont_output_data);
2110 set_mem_align (decl_rtl, DECL_ALIGN (decl));
2112 if (TREE_PUBLIC (decl))
2113 maybe_assemble_visibility (decl);
2115 if (DECL_PRESERVE_P (decl))
2116 targetm.asm_out.mark_decl_preserved (name);
2118 /* First make the assembler name(s) global if appropriate. */
2119 sect = get_variable_section (decl, false);
2120 if (TREE_PUBLIC (decl)
2122 && (sect->common.flags & SECTION_COMMON) == 0)
2123 globalize_decl (decl);
2125 /* Output any data that we will need to use the address of. */
2126 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
2127 output_addressed_constants (DECL_INITIAL (decl));
2129 /* dbxout.c needs to know this. */
2130 if (sect && (sect->common.flags & SECTION_CODE) != 0)
2131 DECL_IN_TEXT_SECTION (decl) = 1;
2133 /* If the decl is part of an object_block, make sure that the decl
2134 has been positioned within its block, but do not write out its
2135 definition yet. output_object_blocks will do that later. */
2136 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
2138 gcc_assert (!dont_output_data);
2139 place_block_symbol (symbol);
2141 else if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
2142 assemble_noswitch_variable (decl, name, sect);
2145 switch_to_section (sect);
2146 if (DECL_ALIGN (decl) > BITS_PER_UNIT)
2147 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (DECL_ALIGN_UNIT (decl)));
2148 assemble_variable_contents (decl, name, dont_output_data);
2152 /* Return 1 if type TYPE contains any pointers. */
2155 contains_pointers_p (tree type)
2157 switch (TREE_CODE (type))
2160 case REFERENCE_TYPE:
2161 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2162 so I'll play safe and return 1. */
2168 case QUAL_UNION_TYPE:
2171 /* For a type that has fields, see if the fields have pointers. */
2172 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
2173 if (TREE_CODE (fields) == FIELD_DECL
2174 && contains_pointers_p (TREE_TYPE (fields)))
2180 /* An array type contains pointers if its element type does. */
2181 return contains_pointers_p (TREE_TYPE (type));
2188 /* In unit-at-a-time mode, we delay assemble_external processing until
2189 the compilation unit is finalized. This is the best we can do for
2190 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2191 it all the way to final. See PR 17982 for further discussion. */
2192 static GTY(()) tree pending_assemble_externals;
2194 #ifdef ASM_OUTPUT_EXTERNAL
2195 /* True if DECL is a function decl for which no out-of-line copy exists.
2196 It is assumed that DECL's assembler name has been set. */
2199 incorporeal_function_p (tree decl)
2201 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
2205 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
2206 && DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA)
2209 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
2210 if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0)
2216 /* Actually do the tests to determine if this is necessary, and invoke
2217 ASM_OUTPUT_EXTERNAL. */
2219 assemble_external_real (tree decl)
2221 rtx rtl = DECL_RTL (decl);
2223 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
2224 && !SYMBOL_REF_USED (XEXP (rtl, 0))
2225 && !incorporeal_function_p (decl))
2227 /* Some systems do require some output. */
2228 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
2229 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
2235 process_pending_assemble_externals (void)
2237 #ifdef ASM_OUTPUT_EXTERNAL
2239 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
2240 assemble_external_real (TREE_VALUE (list));
2242 pending_assemble_externals = 0;
2246 /* Output something to declare an external symbol to the assembler.
2247 (Most assemblers don't need this, so we normally output nothing.)
2248 Do nothing if DECL is not external. */
2251 assemble_external (tree decl ATTRIBUTE_UNUSED)
2253 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2254 main body of this code is only rarely exercised. To provide some
2255 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2256 open. If it's not, we should not be calling this function. */
2257 gcc_assert (asm_out_file);
2259 #ifdef ASM_OUTPUT_EXTERNAL
2260 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
2263 /* We want to output external symbols at very last to check if they
2264 are references or not. */
2265 pending_assemble_externals = tree_cons (0, decl,
2266 pending_assemble_externals);
2270 /* Similar, for calling a library function FUN. */
2273 assemble_external_libcall (rtx fun)
2275 /* Declare library function name external when first used, if nec. */
2276 if (! SYMBOL_REF_USED (fun))
2278 SYMBOL_REF_USED (fun) = 1;
2279 targetm.asm_out.external_libcall (fun);
2283 /* Assemble a label named NAME. */
2286 assemble_label (const char *name)
2288 ASM_OUTPUT_LABEL (asm_out_file, name);
2291 /* Set the symbol_referenced flag for ID. */
2293 mark_referenced (tree id)
2295 TREE_SYMBOL_REFERENCED (id) = 1;
2298 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2300 mark_decl_referenced (tree decl)
2302 if (TREE_CODE (decl) == FUNCTION_DECL)
2304 /* Extern inline functions don't become needed when referenced.
2305 If we know a method will be emitted in other TU and no new
2306 functions can be marked reachable, just use the external
2308 struct cgraph_node *node = cgraph_node (decl);
2309 if (!DECL_EXTERNAL (decl)
2310 && (!node->local.vtable_method || !cgraph_global_info_ready
2311 || !node->local.finalized))
2312 cgraph_mark_needed_node (node);
2314 else if (TREE_CODE (decl) == VAR_DECL)
2316 struct varpool_node *node = varpool_node (decl);
2317 varpool_mark_needed_node (node);
2318 /* C++ frontend use mark_decl_references to force COMDAT variables
2319 to be output that might appear dead otherwise. */
2320 node->force_output = true;
2322 /* else do nothing - we can get various sorts of CST nodes here,
2323 which do not need to be marked. */
2327 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2328 until we find an identifier that is not itself a transparent alias.
2329 Modify the alias passed to it by reference (and all aliases on the
2330 way to the ultimate target), such that they do not have to be
2331 followed again, and return the ultimate target of the alias
2335 ultimate_transparent_alias_target (tree *alias)
2337 tree target = *alias;
2339 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
2341 gcc_assert (TREE_CHAIN (target));
2342 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
2343 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
2344 && ! TREE_CHAIN (target));
2351 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2352 starts with a *, the rest of NAME is output verbatim. Otherwise
2353 NAME is transformed in a target-specific way (usually by the
2354 addition of an underscore). */
2357 assemble_name_raw (FILE *file, const char *name)
2360 fputs (&name[1], file);
2362 ASM_OUTPUT_LABELREF (file, name);
2365 /* Like assemble_name_raw, but should be used when NAME might refer to
2366 an entity that is also represented as a tree (like a function or
2367 variable). If NAME does refer to such an entity, that entity will
2368 be marked as referenced. */
2371 assemble_name (FILE *file, const char *name)
2373 const char *real_name;
2376 real_name = targetm.strip_name_encoding (name);
2378 id = maybe_get_identifier (real_name);
2383 mark_referenced (id);
2384 ultimate_transparent_alias_target (&id);
2386 name = IDENTIFIER_POINTER (id);
2387 gcc_assert (! TREE_CHAIN (id));
2390 assemble_name_raw (file, name);
2393 /* Allocate SIZE bytes writable static space with a gensym name
2394 and return an RTX to refer to its address. */
2397 assemble_static_space (unsigned HOST_WIDE_INT size)
2400 const char *namestring;
2403 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2405 namestring = ggc_strdup (name);
2407 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2408 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2410 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2411 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2414 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2415 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2418 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2419 so that each uninitialized object starts on such a boundary. */
2420 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2421 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2422 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2423 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2424 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2425 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2432 /* Assemble the static constant template for function entry trampolines.
2433 This is done at most once per compilation.
2434 Returns an RTX for the address of the template. */
2436 static GTY(()) rtx initial_trampoline;
2438 #ifdef TRAMPOLINE_TEMPLATE
2440 assemble_trampoline_template (void)
2447 if (initial_trampoline)
2448 return initial_trampoline;
2450 /* By default, put trampoline templates in read-only data section. */
2452 #ifdef TRAMPOLINE_SECTION
2453 switch_to_section (TRAMPOLINE_SECTION);
2455 switch_to_section (readonly_data_section);
2458 /* Write the assembler code to define one. */
2459 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2462 ASM_OUTPUT_ALIGN (asm_out_file, align);
2465 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2466 TRAMPOLINE_TEMPLATE (asm_out_file);
2468 /* Record the rtl to refer to it. */
2469 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2470 name = ggc_strdup (label);
2471 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2472 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2474 initial_trampoline = gen_rtx_MEM (BLKmode, symbol);
2475 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2477 return initial_trampoline;
2481 /* A and B are either alignments or offsets. Return the minimum alignment
2482 that may be assumed after adding the two together. */
2484 static inline unsigned
2485 min_align (unsigned int a, unsigned int b)
2487 return (a | b) & -(a | b);
2490 /* Return the assembler directive for creating a given kind of integer
2491 object. SIZE is the number of bytes in the object and ALIGNED_P
2492 indicates whether it is known to be aligned. Return NULL if the
2493 assembly dialect has no such directive.
2495 The returned string should be printed at the start of a new line and
2496 be followed immediately by the object's initial value. */
2499 integer_asm_op (int size, int aligned_p)
2501 struct asm_int_op *ops;
2504 ops = &targetm.asm_out.aligned_op;
2506 ops = &targetm.asm_out.unaligned_op;
2511 return targetm.asm_out.byte_op;
2525 /* Use directive OP to assemble an integer object X. Print OP at the
2526 start of the line, followed immediately by the value of X. */
2529 assemble_integer_with_op (const char *op, rtx x)
2531 fputs (op, asm_out_file);
2532 output_addr_const (asm_out_file, x);
2533 fputc ('\n', asm_out_file);
2536 /* The default implementation of the asm_out.integer target hook. */
2539 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2540 unsigned int size ATTRIBUTE_UNUSED,
2541 int aligned_p ATTRIBUTE_UNUSED)
2543 const char *op = integer_asm_op (size, aligned_p);
2544 /* Avoid GAS bugs for large values. Specifically negative values whose
2545 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2546 if (size > UNITS_PER_WORD && size > POINTER_SIZE / BITS_PER_UNIT)
2548 return op && (assemble_integer_with_op (op, x), true);
2551 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2552 the alignment of the integer in bits. Return 1 if we were able to output
2553 the constant, otherwise 0. We must be able to output the constant,
2554 if FORCE is nonzero. */
2557 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2561 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2563 /* See if the target hook can handle this kind of object. */
2564 if (targetm.asm_out.integer (x, size, aligned_p))
2567 /* If the object is a multi-byte one, try splitting it up. Split
2568 it into words it if is multi-word, otherwise split it into bytes. */
2571 enum machine_mode omode, imode;
2572 unsigned int subalign;
2573 unsigned int subsize, i;
2575 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2576 subalign = MIN (align, subsize * BITS_PER_UNIT);
2577 omode = mode_for_size (subsize * BITS_PER_UNIT, MODE_INT, 0);
2578 imode = mode_for_size (size * BITS_PER_UNIT, MODE_INT, 0);
2580 for (i = 0; i < size; i += subsize)
2582 rtx partial = simplify_subreg (omode, x, imode, i);
2583 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2589 /* If we've printed some of it, but not all of it, there's no going
2594 gcc_assert (!force);
2600 assemble_real (REAL_VALUE_TYPE d, enum machine_mode mode, unsigned int align)
2602 long data[4] = {0, 0, 0, 0};
2604 int bitsize, nelts, nunits, units_per;
2606 /* This is hairy. We have a quantity of known size. real_to_target
2607 will put it into an array of *host* longs, 32 bits per element
2608 (even if long is more than 32 bits). We need to determine the
2609 number of array elements that are occupied (nelts) and the number
2610 of *target* min-addressable units that will be occupied in the
2611 object file (nunits). We cannot assume that 32 divides the
2612 mode's bitsize (size * BITS_PER_UNIT) evenly.
2614 size * BITS_PER_UNIT is used here to make sure that padding bits
2615 (which might appear at either end of the value; real_to_target
2616 will include the padding bits in its output array) are included. */
2618 nunits = GET_MODE_SIZE (mode);
2619 bitsize = nunits * BITS_PER_UNIT;
2620 nelts = CEIL (bitsize, 32);
2621 units_per = 32 / BITS_PER_UNIT;
2623 real_to_target (data, &d, mode);
2625 /* Put out the first word with the specified alignment. */
2626 assemble_integer (GEN_INT (data[0]), MIN (nunits, units_per), align, 1);
2627 nunits -= units_per;
2629 /* Subsequent words need only 32-bit alignment. */
2630 align = min_align (align, 32);
2632 for (i = 1; i < nelts; i++)
2634 assemble_integer (GEN_INT (data[i]), MIN (nunits, units_per), align, 1);
2635 nunits -= units_per;
2639 /* Given an expression EXP with a constant value,
2640 reduce it to the sum of an assembler symbol and an integer.
2641 Store them both in the structure *VALUE.
2642 EXP must be reducible. */
2644 struct addr_const GTY(())
2647 HOST_WIDE_INT offset;
2651 decode_addr_const (tree exp, struct addr_const *value)
2653 tree target = TREE_OPERAND (exp, 0);
2659 if (TREE_CODE (target) == COMPONENT_REF
2660 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2663 offset += int_byte_position (TREE_OPERAND (target, 1));
2664 target = TREE_OPERAND (target, 0);
2666 else if (TREE_CODE (target) == ARRAY_REF
2667 || TREE_CODE (target) == ARRAY_RANGE_REF)
2669 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2670 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2671 target = TREE_OPERAND (target, 0);
2677 switch (TREE_CODE (target))
2681 x = DECL_RTL (target);
2685 x = gen_rtx_MEM (FUNCTION_MODE,
2686 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2694 x = output_constant_def (target, 1);
2701 gcc_assert (MEM_P (x));
2705 value->offset = offset;
2708 /* Uniquize all constants that appear in memory.
2709 Each constant in memory thus far output is recorded
2710 in `const_desc_table'. */
2712 struct constant_descriptor_tree GTY(())
2714 /* A MEM for the constant. */
2717 /* The value of the constant. */
2720 /* Hash of value. Computing the hash from value each time
2721 hashfn is called can't work properly, as that means recursive
2722 use of the hash table during hash table expansion. */
2726 static GTY((param_is (struct constant_descriptor_tree)))
2727 htab_t const_desc_htab;
2729 static struct constant_descriptor_tree * build_constant_desc (tree);
2730 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2732 /* Compute a hash code for a constant expression. */
2735 const_desc_hash (const void *ptr)
2737 return ((const struct constant_descriptor_tree *)ptr)->hash;
2741 const_hash_1 (const tree exp)
2746 enum tree_code code = TREE_CODE (exp);
2748 /* Either set P and LEN to the address and len of something to hash and
2749 exit the switch or return a value. */
2754 p = (char *) &TREE_INT_CST (exp);
2755 len = sizeof TREE_INT_CST (exp);
2759 return real_hash (TREE_REAL_CST_PTR (exp));
2762 p = TREE_STRING_POINTER (exp);
2763 len = TREE_STRING_LENGTH (exp);
2767 return (const_hash_1 (TREE_REALPART (exp)) * 5
2768 + const_hash_1 (TREE_IMAGPART (exp)));
2772 unsigned HOST_WIDE_INT idx;
2775 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2777 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2779 hi = hi * 603 + const_hash_1 (value);
2787 struct addr_const value;
2789 decode_addr_const (exp, &value);
2790 switch (GET_CODE (value.base))
2793 /* Don't hash the address of the SYMBOL_REF;
2794 only use the offset and the symbol name. */
2796 p = XSTR (value.base, 0);
2797 for (i = 0; p[i] != 0; i++)
2798 hi = ((hi * 613) + (unsigned) (p[i]));
2802 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2812 case POINTER_PLUS_EXPR:
2814 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2815 + const_hash_1 (TREE_OPERAND (exp, 1)));
2819 case NON_LVALUE_EXPR:
2820 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2823 /* A language specific constant. Just hash the code. */
2827 /* Compute hashing function. */
2829 for (i = 0; i < len; i++)
2830 hi = ((hi * 613) + (unsigned) (p[i]));
2835 /* Wrapper of compare_constant, for the htab interface. */
2837 const_desc_eq (const void *p1, const void *p2)
2839 const struct constant_descriptor_tree *c1 = p1;
2840 const struct constant_descriptor_tree *c2 = p2;
2841 if (c1->hash != c2->hash)
2843 return compare_constant (c1->value, c2->value);
2846 /* Compare t1 and t2, and return 1 only if they are known to result in
2847 the same bit pattern on output. */
2850 compare_constant (const tree t1, const tree t2)
2852 enum tree_code typecode;
2854 if (t1 == NULL_TREE)
2855 return t2 == NULL_TREE;
2856 if (t2 == NULL_TREE)
2859 if (TREE_CODE (t1) != TREE_CODE (t2))
2862 switch (TREE_CODE (t1))
2865 /* Integer constants are the same only if the same width of type. */
2866 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2868 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2870 return tree_int_cst_equal (t1, t2);
2873 /* Real constants are the same only if the same width of type. */
2874 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2877 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2880 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2883 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2884 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2885 TREE_STRING_LENGTH (t1)));
2888 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2889 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2893 VEC(constructor_elt, gc) *v1, *v2;
2894 unsigned HOST_WIDE_INT idx;
2896 typecode = TREE_CODE (TREE_TYPE (t1));
2897 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2900 if (typecode == ARRAY_TYPE)
2902 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
2903 /* For arrays, check that the sizes all match. */
2904 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
2906 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
2911 /* For record and union constructors, require exact type
2913 if (TREE_TYPE (t1) != TREE_TYPE (t2))
2917 v1 = CONSTRUCTOR_ELTS (t1);
2918 v2 = CONSTRUCTOR_ELTS (t2);
2919 if (VEC_length (constructor_elt, v1)
2920 != VEC_length (constructor_elt, v2))
2923 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
2925 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
2926 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
2928 /* Check that each value is the same... */
2929 if (!compare_constant (c1->value, c2->value))
2931 /* ... and that they apply to the same fields! */
2932 if (typecode == ARRAY_TYPE)
2934 if (!compare_constant (c1->index, c2->index))
2939 if (c1->index != c2->index)
2950 struct addr_const value1, value2;
2952 decode_addr_const (t1, &value1);
2953 decode_addr_const (t2, &value2);
2954 return (value1.offset == value2.offset
2955 && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
2959 case POINTER_PLUS_EXPR:
2962 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
2963 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
2967 case NON_LVALUE_EXPR:
2968 case VIEW_CONVERT_EXPR:
2969 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
2974 nt1 = lang_hooks.expand_constant (t1);
2975 nt2 = lang_hooks.expand_constant (t2);
2976 if (nt1 != t1 || nt2 != t2)
2977 return compare_constant (nt1, nt2);
2986 /* Make a copy of the whole tree structure for a constant. This
2987 handles the same types of nodes that compare_constant handles. */
2990 copy_constant (tree exp)
2992 switch (TREE_CODE (exp))
2995 /* For ADDR_EXPR, we do not want to copy the decl whose address
2996 is requested. We do want to copy constants though. */
2997 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
2998 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2999 copy_constant (TREE_OPERAND (exp, 0)));
3001 return copy_node (exp);
3006 return copy_node (exp);
3009 return build_complex (TREE_TYPE (exp),
3010 copy_constant (TREE_REALPART (exp)),
3011 copy_constant (TREE_IMAGPART (exp)));
3014 case POINTER_PLUS_EXPR:
3016 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
3017 copy_constant (TREE_OPERAND (exp, 0)),
3018 copy_constant (TREE_OPERAND (exp, 1)));
3022 case NON_LVALUE_EXPR:
3023 case VIEW_CONVERT_EXPR:
3024 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3025 copy_constant (TREE_OPERAND (exp, 0)));
3029 tree copy = copy_node (exp);
3030 VEC(constructor_elt, gc) *v;
3031 unsigned HOST_WIDE_INT idx;
3032 tree purpose, value;
3034 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
3035 CONSTRUCTOR_ELTS (exp)));
3036 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
3038 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
3039 ce->index = purpose;
3040 ce->value = copy_constant (value);
3042 CONSTRUCTOR_ELTS (copy) = v;
3048 tree t = lang_hooks.expand_constant (exp);
3050 gcc_assert (t != exp);
3051 return copy_constant (t);
3056 /* Return the alignment of constant EXP in bits. */
3059 get_constant_alignment (tree exp)
3063 align = TYPE_ALIGN (TREE_TYPE (exp));
3064 #ifdef CONSTANT_ALIGNMENT
3065 align = CONSTANT_ALIGNMENT (exp, align);
3070 /* Return the section into which constant EXP should be placed. */
3073 get_constant_section (tree exp)
3075 if (IN_NAMED_SECTION (exp))
3076 return get_named_section (exp, NULL, compute_reloc_for_constant (exp));
3078 return targetm.asm_out.select_section (exp,
3079 compute_reloc_for_constant (exp),
3080 get_constant_alignment (exp));
3083 /* Return the size of constant EXP in bytes. */
3085 static HOST_WIDE_INT
3086 get_constant_size (tree exp)
3090 size = int_size_in_bytes (TREE_TYPE (exp));
3091 if (TREE_CODE (exp) == STRING_CST)
3092 size = MAX (TREE_STRING_LENGTH (exp), size);
3096 /* Subroutine of output_constant_def:
3097 No constant equal to EXP is known to have been output.
3098 Make a constant descriptor to enter EXP in the hash table.
3099 Assign the label number and construct RTL to refer to the
3100 constant's location in memory.
3101 Caller is responsible for updating the hash table. */
3103 static struct constant_descriptor_tree *
3104 build_constant_desc (tree exp)
3110 struct constant_descriptor_tree *desc;
3112 desc = ggc_alloc (sizeof (*desc));
3113 desc->value = copy_constant (exp);
3115 /* Propagate marked-ness to copied constant. */
3116 if (flag_mudflap && mf_marked_p (exp))
3117 mf_mark (desc->value);
3119 /* Create a string containing the label name, in LABEL. */
3120 labelno = const_labelno++;
3121 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
3123 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3124 if (use_object_blocks_p ())
3126 section *sect = get_constant_section (exp);
3127 symbol = create_block_symbol (ggc_strdup (label),
3128 get_block_for_section (sect), -1);
3131 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3132 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3133 SET_SYMBOL_REF_DECL (symbol, desc->value);
3134 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3136 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
3137 set_mem_attributes (rtl, exp, 1);
3138 set_mem_alias_set (rtl, 0);
3139 set_mem_alias_set (rtl, const_alias_set);
3141 /* Set flags or add text to the name to record information, such as
3142 that it is a local symbol. If the name is changed, the macro
3143 ASM_OUTPUT_LABELREF will have to know how to strip this
3144 information. This call might invalidate our local variable
3145 SYMBOL; we can't use it afterward. */
3147 targetm.encode_section_info (exp, rtl, true);
3154 /* Return an rtx representing a reference to constant data in memory
3155 for the constant expression EXP.
3157 If assembler code for such a constant has already been output,
3158 return an rtx to refer to it.
3159 Otherwise, output such a constant in memory
3160 and generate an rtx for it.
3162 If DEFER is nonzero, this constant can be deferred and output only
3163 if referenced in the function after all optimizations.
3165 `const_desc_table' records which constants already have label strings. */
3168 output_constant_def (tree exp, int defer)
3170 struct constant_descriptor_tree *desc;
3171 struct constant_descriptor_tree key;
3174 /* Look up EXP in the table of constant descriptors. If we didn't find
3175 it, create a new one. */
3177 key.hash = const_hash_1 (exp);
3178 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
3183 desc = build_constant_desc (exp);
3184 desc->hash = key.hash;
3188 maybe_output_constant_def_contents (desc, defer);
3192 /* Subroutine of output_constant_def: Decide whether or not we need to
3193 output the constant DESC now, and if so, do it. */
3195 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
3198 rtx symbol = XEXP (desc->rtl, 0);
3199 tree exp = desc->value;
3201 if (flag_syntax_only)
3204 if (TREE_ASM_WRITTEN (exp))
3205 /* Already output; don't do it again. */
3208 /* We can always defer constants as long as the context allows
3212 /* Increment n_deferred_constants if it exists. It needs to be at
3213 least as large as the number of constants actually referred to
3214 by the function. If it's too small we'll stop looking too early
3215 and fail to emit constants; if it's too large we'll only look
3216 through the entire function when we could have stopped earlier. */
3218 n_deferred_constants++;
3222 output_constant_def_contents (symbol);
3225 /* Subroutine of output_constant_def_contents. Output the definition
3226 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3227 constant's alignment in bits. */
3230 assemble_constant_contents (tree exp, const char *label, unsigned int align)
3234 size = get_constant_size (exp);
3236 /* Do any machine/system dependent processing of the constant. */
3237 #ifdef ASM_DECLARE_CONSTANT_NAME
3238 ASM_DECLARE_CONSTANT_NAME (asm_out_file, label, exp, size);
3240 /* Standard thing is just output label for the constant. */
3241 ASM_OUTPUT_LABEL (asm_out_file, label);
3242 #endif /* ASM_DECLARE_CONSTANT_NAME */
3244 /* Output the value of EXP. */
3245 output_constant (exp, size, align);
3248 /* We must output the constant data referred to by SYMBOL; do so. */
3251 output_constant_def_contents (rtx symbol)
3253 tree exp = SYMBOL_REF_DECL (symbol);
3256 /* Make sure any other constants whose addresses appear in EXP
3257 are assigned label numbers. */
3258 output_addressed_constants (exp);
3260 /* We are no longer deferring this constant. */
3261 TREE_ASM_WRITTEN (exp) = 1;
3263 /* If the constant is part of an object block, make sure that the
3264 decl has been positioned within its block, but do not write out
3265 its definition yet. output_object_blocks will do that later. */
3266 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
3267 place_block_symbol (symbol);
3270 switch_to_section (get_constant_section (exp));
3271 align = get_constant_alignment (exp);
3272 if (align > BITS_PER_UNIT)
3273 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
3274 assemble_constant_contents (exp, XSTR (symbol, 0), align);
3277 mudflap_enqueue_constant (exp);
3280 /* Look up EXP in the table of constant descriptors. Return the rtl
3281 if it has been emitted, else null. */
3284 lookup_constant_def (tree exp)
3286 struct constant_descriptor_tree *desc;
3287 struct constant_descriptor_tree key;
3290 key.hash = const_hash_1 (exp);
3291 desc = htab_find_with_hash (const_desc_htab, &key, key.hash);
3293 return (desc ? desc->rtl : NULL_RTX);
3296 /* Used in the hash tables to avoid outputting the same constant
3297 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3298 are output once per function, not once per file. */
3299 /* ??? Only a few targets need per-function constant pools. Most
3300 can use one per-file pool. Should add a targetm bit to tell the
3303 struct rtx_constant_pool GTY(())
3305 /* Pointers to first and last constant in pool, as ordered by offset. */
3306 struct constant_descriptor_rtx *first;
3307 struct constant_descriptor_rtx *last;
3309 /* Hash facility for making memory-constants from constant rtl-expressions.
3310 It is used on RISC machines where immediate integer arguments and
3311 constant addresses are restricted so that such constants must be stored
3313 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
3315 /* Current offset in constant pool (does not include any
3316 machine-specific header). */
3317 HOST_WIDE_INT offset;
3320 struct constant_descriptor_rtx GTY((chain_next ("%h.next")))
3322 struct constant_descriptor_rtx *next;
3326 HOST_WIDE_INT offset;
3328 enum machine_mode mode;
3334 /* Hash and compare functions for const_rtx_htab. */
3337 const_desc_rtx_hash (const void *ptr)
3339 const struct constant_descriptor_rtx *desc = ptr;
3344 const_desc_rtx_eq (const void *a, const void *b)
3346 const struct constant_descriptor_rtx *x = a;
3347 const struct constant_descriptor_rtx *y = b;
3349 if (x->mode != y->mode)
3351 return rtx_equal_p (x->constant, y->constant);
3354 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3357 const_rtx_hash_1 (rtx *xp, void *data)
3359 unsigned HOST_WIDE_INT hwi;
3360 enum machine_mode mode;
3366 code = GET_CODE (x);
3367 mode = GET_MODE (x);
3368 h = (hashval_t) code * 1048573 + mode;
3376 const int shift = sizeof (hashval_t) * CHAR_BIT;
3377 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3380 h ^= (hashval_t) hwi;
3381 for (i = 1; i < n; ++i)
3384 h ^= (hashval_t) hwi;
3390 if (mode == VOIDmode)
3392 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3396 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3402 for (i = XVECLEN (x, 0); i-- > 0; )
3403 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3408 h ^= htab_hash_string (XSTR (x, 0));
3412 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3416 case UNSPEC_VOLATILE:
3417 h = h * 251 + XINT (x, 1);
3425 *hp = *hp * 509 + h;
3429 /* Compute a hash value for X, which should be a constant. */
3432 const_rtx_hash (rtx x)
3435 for_each_rtx (&x, const_rtx_hash_1, &h);
3440 /* Create and return a new rtx constant pool. */
3442 static struct rtx_constant_pool *
3443 create_constant_pool (void)
3445 struct rtx_constant_pool *pool;
3447 pool = ggc_alloc (sizeof (struct rtx_constant_pool));
3448 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3449 const_desc_rtx_eq, NULL);
3456 /* Initialize constant pool hashing for a new function. */
3459 init_varasm_status (struct function *f)
3461 struct varasm_status *p;
3463 p = ggc_alloc (sizeof (struct varasm_status));
3466 p->pool = create_constant_pool ();
3467 p->deferred_constants = 0;
3470 /* Given a MINUS expression, simplify it if both sides
3471 include the same symbol. */
3474 simplify_subtraction (rtx x)
3476 rtx r = simplify_rtx (x);
3480 /* Given a constant rtx X, make (or find) a memory constant for its value
3481 and return a MEM rtx to refer to it in memory. */
3484 force_const_mem (enum machine_mode mode, rtx x)
3486 struct constant_descriptor_rtx *desc, tmp;
3487 struct rtx_constant_pool *pool;
3494 /* If we're not allowed to drop X into the constant pool, don't. */
3495 if (targetm.cannot_force_const_mem (x))
3498 /* Record that this function has used a constant pool entry. */
3499 current_function_uses_const_pool = 1;
3501 /* Decide which pool to use. */
3502 pool = (targetm.use_blocks_for_constant_p (mode, x)
3503 ? shared_constant_pool
3504 : cfun->varasm->pool);
3506 /* Lookup the value in the hashtable. */
3509 hash = const_rtx_hash (x);
3510 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3513 /* If the constant was already present, return its memory. */
3515 return copy_rtx (desc->mem);
3517 /* Otherwise, create a new descriptor. */
3518 desc = ggc_alloc (sizeof (*desc));
3521 /* Align the location counter as required by EXP's data type. */
3522 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3523 #ifdef CONSTANT_ALIGNMENT
3525 tree type = lang_hooks.types.type_for_mode (mode, 0);
3526 if (type != NULL_TREE)
3527 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3531 pool->offset += (align / BITS_PER_UNIT) - 1;
3532 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3535 desc->constant = tmp.constant;
3536 desc->offset = pool->offset;
3539 desc->align = align;
3540 desc->labelno = const_labelno;
3543 pool->offset += GET_MODE_SIZE (mode);
3545 pool->last->next = desc;
3547 pool->first = pool->last = desc;
3550 /* Create a string containing the label name, in LABEL. */
3551 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3554 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3555 the constants pool. */
3556 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3558 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3559 symbol = create_block_symbol (ggc_strdup (label),
3560 get_block_for_section (sect), -1);
3563 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3565 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3566 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3567 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3569 /* Construct the MEM. */
3570 desc->mem = def = gen_const_mem (mode, symbol);
3571 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3572 set_mem_align (def, align);
3574 /* If we're dropping a label to the constant pool, make sure we
3576 if (GET_CODE (x) == LABEL_REF)
3577 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3579 return copy_rtx (def);
3582 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3585 get_pool_constant (rtx addr)
3587 return SYMBOL_REF_CONSTANT (addr)->constant;
3590 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3591 and whether it has been output or not. */
3594 get_pool_constant_mark (rtx addr, bool *pmarked)
3596 struct constant_descriptor_rtx *desc;
3598 desc = SYMBOL_REF_CONSTANT (addr);
3599 *pmarked = (desc->mark != 0);
3600 return desc->constant;
3603 /* Similar, return the mode. */
3606 get_pool_mode (const_rtx addr)
3608 return SYMBOL_REF_CONSTANT (addr)->mode;
3611 /* Return the size of the constant pool. */
3614 get_pool_size (void)
3616 return cfun->varasm->pool->offset;
3619 /* Worker function for output_constant_pool_1. Emit assembly for X
3620 in MODE with known alignment ALIGN. */
3623 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3625 switch (GET_MODE_CLASS (mode))
3628 case MODE_DECIMAL_FLOAT:
3632 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3633 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3634 assemble_real (r, mode, align);
3639 case MODE_PARTIAL_INT:
3640 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3643 case MODE_VECTOR_FLOAT:
3644 case MODE_VECTOR_INT:
3647 enum machine_mode submode = GET_MODE_INNER (mode);
3648 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3650 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3651 units = CONST_VECTOR_NUNITS (x);
3653 for (i = 0; i < units; i++)
3655 rtx elt = CONST_VECTOR_ELT (x, i);
3656 output_constant_pool_2 (submode, elt, i ? subalign : align);
3666 /* Worker function for output_constant_pool. Emit constant DESC,
3667 giving it ALIGN bits of alignment. */
3670 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3677 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3678 whose CODE_LABEL has been deleted. This can occur if a jump table
3679 is eliminated by optimization. If so, write a constant of zero
3680 instead. Note that this can also happen by turning the
3681 CODE_LABEL into a NOTE. */
3682 /* ??? This seems completely and utterly wrong. Certainly it's
3683 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3684 functioning even with INSN_DELETED_P and friends. */
3687 switch (GET_CODE (x))
3690 if (GET_CODE (XEXP (x, 0)) != PLUS
3691 || GET_CODE (XEXP (XEXP (x, 0), 0)) != LABEL_REF)
3693 tmp = XEXP (XEXP (x, 0), 0);
3698 gcc_assert (!INSN_DELETED_P (tmp));
3699 gcc_assert (!NOTE_P (tmp)
3700 || NOTE_KIND (tmp) != NOTE_INSN_DELETED);
3707 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3708 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3709 align, desc->labelno, done);
3712 assemble_align (align);
3714 /* Output the label. */
3715 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3717 /* Output the data. */
3718 output_constant_pool_2 (desc->mode, x, align);
3720 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3721 sections have proper size. */
3722 if (align > GET_MODE_BITSIZE (desc->mode)
3724 && (in_section->common.flags & SECTION_MERGE))
3725 assemble_align (align);
3727 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3733 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3734 to as used. Emit referenced deferred strings. This function can
3735 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3738 mark_constant (rtx *current_rtx, void *data ATTRIBUTE_UNUSED)
3740 rtx x = *current_rtx;
3742 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3745 if (CONSTANT_POOL_ADDRESS_P (x))
3747 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3748 if (desc->mark == 0)
3751 for_each_rtx (&desc->constant, mark_constant, NULL);
3754 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3756 tree exp = SYMBOL_REF_DECL (x);
3757 if (!TREE_ASM_WRITTEN (exp))
3759 n_deferred_constants--;
3760 output_constant_def_contents (x);
3767 /* Look through appropriate parts of INSN, marking all entries in the
3768 constant pool which are actually being used. Entries that are only
3769 referenced by other constants are also marked as used. Emit
3770 deferred strings that are used. */
3773 mark_constants (rtx insn)
3778 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3779 insns, not any notes that may be attached. We don't want to mark
3780 a constant just because it happens to appear in a REG_EQUIV note. */
3781 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3783 rtx seq = PATTERN (insn);
3784 int i, n = XVECLEN (seq, 0);
3785 for (i = 0; i < n; ++i)
3787 rtx subinsn = XVECEXP (seq, 0, i);
3788 if (INSN_P (subinsn))
3789 for_each_rtx (&PATTERN (subinsn), mark_constant, NULL);
3793 for_each_rtx (&PATTERN (insn), mark_constant, NULL);
3796 /* Look through the instructions for this function, and mark all the
3797 entries in POOL which are actually being used. Emit deferred constants
3798 which have indeed been used. */
3801 mark_constant_pool (void)
3805 if (!current_function_uses_const_pool && n_deferred_constants == 0)
3808 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3809 mark_constants (insn);
3811 for (link = current_function_epilogue_delay_list;
3813 link = XEXP (link, 1))
3814 mark_constants (XEXP (link, 0));
3817 /* Write all the constants in POOL. */
3820 output_constant_pool_contents (struct rtx_constant_pool *pool)
3822 struct constant_descriptor_rtx *desc;
3824 for (desc = pool->first; desc ; desc = desc->next)
3827 /* If the constant is part of an object_block, make sure that
3828 the constant has been positioned within its block, but do not
3829 write out its definition yet. output_object_blocks will do
3831 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
3832 && SYMBOL_REF_BLOCK (desc->sym))
3833 place_block_symbol (desc->sym);
3836 switch_to_section (targetm.asm_out.select_rtx_section
3837 (desc->mode, desc->constant, desc->align));
3838 output_constant_pool_1 (desc, desc->align);
3843 /* Mark all constants that are used in the current function, then write
3844 out the function's private constant pool. */
3847 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3848 tree fndecl ATTRIBUTE_UNUSED)
3850 struct rtx_constant_pool *pool = cfun->varasm->pool;
3852 /* It is possible for gcc to call force_const_mem and then to later
3853 discard the instructions which refer to the constant. In such a
3854 case we do not need to output the constant. */
3855 mark_constant_pool ();
3857 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3858 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3861 output_constant_pool_contents (pool);
3863 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3864 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3868 /* Write the contents of the shared constant pool. */
3871 output_shared_constant_pool (void)
3873 output_constant_pool_contents (shared_constant_pool);
3876 /* Determine what kind of relocations EXP may need. */
3879 compute_reloc_for_constant (tree exp)
3881 int reloc = 0, reloc2;
3884 /* Give the front-end a chance to convert VALUE to something that
3885 looks more like a constant to the back-end. */
3886 exp = lang_hooks.expand_constant (exp);
3888 switch (TREE_CODE (exp))
3892 /* Go inside any operations that get_inner_reference can handle and see
3893 if what's inside is a constant: no need to do anything here for
3894 addresses of variables or functions. */
3895 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3896 tem = TREE_OPERAND (tem, 0))
3899 if (TREE_PUBLIC (tem))
3906 case POINTER_PLUS_EXPR:
3907 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3908 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3912 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3913 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3914 /* The difference of two local labels is computable at link time. */
3915 if (reloc == 1 && reloc2 == 1)
3923 case NON_LVALUE_EXPR:
3924 case VIEW_CONVERT_EXPR:
3925 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3930 unsigned HOST_WIDE_INT idx;
3931 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3933 reloc |= compute_reloc_for_constant (tem);
3943 /* Find all the constants whose addresses are referenced inside of EXP,
3944 and make sure assembler code with a label has been output for each one.
3945 Indicate whether an ADDR_EXPR has been encountered. */
3948 output_addressed_constants (tree exp)
3952 /* Give the front-end a chance to convert VALUE to something that
3953 looks more like a constant to the back-end. */
3954 exp = lang_hooks.expand_constant (exp);
3956 switch (TREE_CODE (exp))
3960 /* Go inside any operations that get_inner_reference can handle and see
3961 if what's inside is a constant: no need to do anything here for
3962 addresses of variables or functions. */
3963 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3964 tem = TREE_OPERAND (tem, 0))
3967 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3968 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
3969 tem = DECL_INITIAL (tem);
3971 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
3972 output_constant_def (tem, 0);
3976 case POINTER_PLUS_EXPR:
3978 output_addressed_constants (TREE_OPERAND (exp, 1));
3983 case NON_LVALUE_EXPR:
3984 case VIEW_CONVERT_EXPR:
3985 output_addressed_constants (TREE_OPERAND (exp, 0));
3990 unsigned HOST_WIDE_INT idx;
3991 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3993 output_addressed_constants (tem);
4002 /* Whether a constructor CTOR is a valid static constant initializer if all
4003 its elements are. This used to be internal to initializer_constant_valid_p
4004 and has been exposed to let other functions like categorize_ctor_elements
4005 evaluate the property while walking a constructor for other purposes. */
4008 constructor_static_from_elts_p (tree ctor)
4010 return (TREE_CONSTANT (ctor)
4011 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4012 || TREE_CODE (TREE_TYPE (ctor)) == RECORD_TYPE)
4013 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (ctor)));
4016 /* Return nonzero if VALUE is a valid constant-valued expression
4017 for use in initializing a static variable; one that can be an
4018 element of a "constant" initializer.
4020 Return null_pointer_node if the value is absolute;
4021 if it is relocatable, return the variable that determines the relocation.
4022 We assume that VALUE has been folded as much as possible;
4023 therefore, we do not need to check for such things as
4024 arithmetic-combinations of integers. */
4027 initializer_constant_valid_p (tree value, tree endtype)
4029 /* Give the front-end a chance to convert VALUE to something that
4030 looks more like a constant to the back-end. */
4031 value = lang_hooks.expand_constant (value);
4033 switch (TREE_CODE (value))
4036 if (constructor_static_from_elts_p (value))
4038 unsigned HOST_WIDE_INT idx;
4040 bool absolute = true;
4042 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4045 reloc = initializer_constant_valid_p (elt, TREE_TYPE (elt));
4048 if (reloc != null_pointer_node)
4051 /* For a non-absolute relocation, there is no single
4052 variable that can be "the variable that determines the
4054 return absolute ? null_pointer_node : error_mark_node;
4057 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
4064 return null_pointer_node;
4068 value = staticp (TREE_OPERAND (value, 0));
4071 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out to
4072 be a constant, this is old-skool offsetof-like nonsense. */
4073 if (TREE_CODE (value) == INDIRECT_REF
4074 && TREE_CONSTANT (TREE_OPERAND (value, 0)))
4075 return null_pointer_node;
4076 /* Taking the address of a nested function involves a trampoline. */
4077 if (TREE_CODE (value) == FUNCTION_DECL
4078 && decl_function_context (value)
4079 && !DECL_NO_STATIC_CHAIN (value))
4081 /* "&{...}" requires a temporary to hold the constructed
4083 if (TREE_CODE (value) == CONSTRUCTOR)
4088 case VIEW_CONVERT_EXPR:
4089 case NON_LVALUE_EXPR:
4090 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
4099 src = TREE_OPERAND (value, 0);
4100 src_type = TREE_TYPE (src);
4101 dest_type = TREE_TYPE (value);
4103 /* Allow conversions between pointer types, floating-point
4104 types, and offset types. */
4105 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
4106 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
4107 || (TREE_CODE (dest_type) == OFFSET_TYPE
4108 && TREE_CODE (src_type) == OFFSET_TYPE))
4109 return initializer_constant_valid_p (src, endtype);
4111 /* Allow length-preserving conversions between integer types. */
4112 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
4113 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
4114 return initializer_constant_valid_p (src, endtype);
4116 /* Allow conversions between other integer types only if
4118 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
4120 tree inner = initializer_constant_valid_p (src, endtype);
4121 if (inner == null_pointer_node)
4122 return null_pointer_node;
4126 /* Allow (int) &foo provided int is as wide as a pointer. */
4127 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
4128 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
4129 return initializer_constant_valid_p (src, endtype);
4131 /* Likewise conversions from int to pointers, but also allow
4132 conversions from 0. */
4133 if ((POINTER_TYPE_P (dest_type)
4134 || TREE_CODE (dest_type) == OFFSET_TYPE)
4135 && INTEGRAL_TYPE_P (src_type))
4137 if (TREE_CODE (src) == INTEGER_CST
4138 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
4139 return null_pointer_node;
4140 if (integer_zerop (src))
4141 return null_pointer_node;
4142 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
4143 return initializer_constant_valid_p (src, endtype);
4146 /* Allow conversions to struct or union types if the value
4148 if (TREE_CODE (dest_type) == RECORD_TYPE
4149 || TREE_CODE (dest_type) == UNION_TYPE)
4150 return initializer_constant_valid_p (src, endtype);
4154 case POINTER_PLUS_EXPR:
4156 if (! INTEGRAL_TYPE_P (endtype)
4157 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
4159 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4161 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
4163 /* If either term is absolute, use the other terms relocation. */
4164 if (valid0 == null_pointer_node)
4166 if (valid1 == null_pointer_node)
4172 if (! INTEGRAL_TYPE_P (endtype)
4173 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
4175 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4177 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
4179 /* Win if second argument is absolute. */
4180 if (valid1 == null_pointer_node)
4182 /* Win if both arguments have the same relocation.
4183 Then the value is absolute. */
4184 if (valid0 == valid1 && valid0 != 0)
4185 return null_pointer_node;
4187 /* Since GCC guarantees that string constants are unique in the
4188 generated code, a subtraction between two copies of the same
4189 constant string is absolute. */
4190 if (valid0 && TREE_CODE (valid0) == STRING_CST
4191 && valid1 && TREE_CODE (valid1) == STRING_CST
4192 && operand_equal_p (valid0, valid1, 1))
4193 return null_pointer_node;
4196 /* Support narrowing differences. */
4197 if (INTEGRAL_TYPE_P (endtype))
4201 op0 = TREE_OPERAND (value, 0);
4202 op1 = TREE_OPERAND (value, 1);
4204 /* Like STRIP_NOPS except allow the operand mode to widen.
4205 This works around a feature of fold that simplifies
4206 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
4207 that the narrower operation is cheaper. */
4209 while (TREE_CODE (op0) == NOP_EXPR
4210 || TREE_CODE (op0) == CONVERT_EXPR
4211 || TREE_CODE (op0) == NON_LVALUE_EXPR)
4213 tree inner = TREE_OPERAND (op0, 0);
4214 if (inner == error_mark_node
4215 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4216 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
4217 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4222 while (TREE_CODE (op1) == NOP_EXPR
4223 || TREE_CODE (op1) == CONVERT_EXPR
4224 || TREE_CODE (op1) == NON_LVALUE_EXPR)
4226 tree inner = TREE_OPERAND (op1, 0);
4227 if (inner == error_mark_node
4228 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4229 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
4230 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4235 op0 = initializer_constant_valid_p (op0, endtype);
4236 op1 = initializer_constant_valid_p (op1, endtype);
4238 /* Both initializers must be known. */
4242 return null_pointer_node;
4244 /* Support differences between labels. */
4245 if (TREE_CODE (op0) == LABEL_DECL
4246 && TREE_CODE (op1) == LABEL_DECL)
4247 return null_pointer_node;
4249 if (TREE_CODE (op0) == STRING_CST
4250 && TREE_CODE (op1) == STRING_CST
4251 && operand_equal_p (op0, op1, 1))
4252 return null_pointer_node;
4264 /* Output assembler code for constant EXP to FILE, with no label.
4265 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4266 Assumes output_addressed_constants has been done on EXP already.
4268 Generate exactly SIZE bytes of assembler data, padding at the end
4269 with zeros if necessary. SIZE must always be specified.
4271 SIZE is important for structure constructors,
4272 since trailing members may have been omitted from the constructor.
4273 It is also important for initialization of arrays from string constants
4274 since the full length of the string constant might not be wanted.
4275 It is also needed for initialization of unions, where the initializer's
4276 type is just one member, and that may not be as long as the union.
4278 There a case in which we would fail to output exactly SIZE bytes:
4279 for a structure constructor that wants to produce more than SIZE bytes.
4280 But such constructors will never be generated for any possible input.
4282 ALIGN is the alignment of the data in bits. */
4285 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
4287 enum tree_code code;
4288 unsigned HOST_WIDE_INT thissize;
4290 /* Some front-ends use constants other than the standard language-independent
4291 varieties, but which may still be output directly. Give the front-end a
4292 chance to convert EXP to a language-independent representation. */
4293 exp = lang_hooks.expand_constant (exp);
4295 if (size == 0 || flag_syntax_only)
4298 /* See if we're trying to initialize a pointer in a non-default mode
4299 to the address of some declaration somewhere. If the target says
4300 the mode is valid for pointers, assume the target has a way of
4302 if (TREE_CODE (exp) == NOP_EXPR
4303 && POINTER_TYPE_P (TREE_TYPE (exp))
4304 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
4306 tree saved_type = TREE_TYPE (exp);
4308 /* Peel off any intermediate conversions-to-pointer for valid
4310 while (TREE_CODE (exp) == NOP_EXPR
4311 && POINTER_TYPE_P (TREE_TYPE (exp))
4312 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
4313 exp = TREE_OPERAND (exp, 0);
4315 /* If what we're left with is the address of something, we can
4316 convert the address to the final type and output it that
4318 if (TREE_CODE (exp) == ADDR_EXPR)
4319 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
4320 /* Likewise for constant ints. */
4321 else if (TREE_CODE (exp) == INTEGER_CST)
4322 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
4323 TREE_INT_CST_HIGH (exp));
4327 /* Eliminate any conversions since we'll be outputting the underlying
4329 while (TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
4330 || TREE_CODE (exp) == NON_LVALUE_EXPR
4331 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4333 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4334 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4336 /* Make sure eliminating the conversion is really a no-op, except with
4337 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4338 union types to allow for Ada unchecked unions. */
4339 if (type_size > op_size
4340 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4341 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4342 /* Keep the conversion. */
4345 exp = TREE_OPERAND (exp, 0);
4348 code = TREE_CODE (TREE_TYPE (exp));
4349 thissize = int_size_in_bytes (TREE_TYPE (exp));
4351 /* Give the front end another chance to expand constants. */
4352 exp = lang_hooks.expand_constant (exp);
4354 /* Allow a constructor with no elements for any data type.
4355 This means to fill the space with zeros. */
4356 if (TREE_CODE (exp) == CONSTRUCTOR
4357 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
4359 assemble_zeros (size);
4363 if (TREE_CODE (exp) == FDESC_EXPR)
4365 #ifdef ASM_OUTPUT_FDESC
4366 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
4367 tree decl = TREE_OPERAND (exp, 0);
4368 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4375 /* Now output the underlying data. If we've handling the padding, return.
4376 Otherwise, break and ensure SIZE is the size written. */
4383 case REFERENCE_TYPE:
4385 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4386 EXPAND_INITIALIZER),
4387 MIN (size, thissize), align, 0))
4388 error ("initializer for integer value is too complicated");
4392 if (TREE_CODE (exp) != REAL_CST)
4393 error ("initializer for floating value is not a floating constant");
4395 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4399 output_constant (TREE_REALPART (exp), thissize / 2, align);
4400 output_constant (TREE_IMAGPART (exp), thissize / 2,
4401 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4406 switch (TREE_CODE (exp))
4409 output_constructor (exp, size, align);
4412 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4414 assemble_string (TREE_STRING_POINTER (exp), thissize);
4421 unsigned int nalign;
4422 enum machine_mode inner;
4424 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4425 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4427 elt_size = GET_MODE_SIZE (inner);
4429 link = TREE_VECTOR_CST_ELTS (exp);
4430 output_constant (TREE_VALUE (link), elt_size, align);
4431 thissize = elt_size;
4432 while ((link = TREE_CHAIN (link)) != NULL)
4434 output_constant (TREE_VALUE (link), elt_size, nalign);
4435 thissize += elt_size;
4446 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4447 output_constructor (exp, size, align);
4457 if (size > thissize)
4458 assemble_zeros (size - thissize);
4462 /* Subroutine of output_constructor, used for computing the size of
4463 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4464 type with an unspecified upper bound. */
4466 static unsigned HOST_WIDE_INT
4467 array_size_for_constructor (tree val)
4470 unsigned HOST_WIDE_INT cnt;
4471 tree index, value, tmp;
4473 /* This code used to attempt to handle string constants that are not
4474 arrays of single-bytes, but nothing else does, so there's no point in
4476 if (TREE_CODE (val) == STRING_CST)
4477 return TREE_STRING_LENGTH (val);
4479 max_index = NULL_TREE;
4480 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4482 if (TREE_CODE (index) == RANGE_EXPR)
4483 index = TREE_OPERAND (index, 1);
4484 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4488 if (max_index == NULL_TREE)
4491 /* Compute the total number of array elements. */
4492 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4493 i = size_binop (MINUS_EXPR, fold_convert (sizetype, max_index),
4494 fold_convert (sizetype, tmp));
4495 i = size_binop (PLUS_EXPR, i, build_int_cst (sizetype, 1));
4497 /* Multiply by the array element unit size to find number of bytes. */
4498 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4500 return tree_low_cst (i, 1);
4503 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4504 Generate at least SIZE bytes, padding if necessary. */
4507 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
4510 tree type = TREE_TYPE (exp);
4513 /* Number of bytes output or skipped so far.
4514 In other words, current position within the constructor. */
4515 HOST_WIDE_INT total_bytes = 0;
4516 /* Nonzero means BYTE contains part of a byte, to be output. */
4517 int byte_buffer_in_use = 0;
4519 unsigned HOST_WIDE_INT cnt;
4520 constructor_elt *ce;
4522 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
4524 if (TREE_CODE (type) == RECORD_TYPE)
4525 field = TYPE_FIELDS (type);
4527 if (TREE_CODE (type) == ARRAY_TYPE
4528 && TYPE_DOMAIN (type) != 0)
4529 min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (type));
4531 /* As LINK goes through the elements of the constant,
4532 FIELD goes through the structure fields, if the constant is a structure.
4533 if the constant is a union, then we override this,
4534 by getting the field from the TREE_LIST element.
4535 But the constant could also be an array. Then FIELD is zero.
4537 There is always a maximum of one element in the chain LINK for unions
4538 (even if the initializer in a source program incorrectly contains
4541 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
4542 cnt++, field = field ? TREE_CHAIN (field) : 0)
4544 tree val = ce->value;
4547 /* The element in a union constructor specifies the proper field
4549 if ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
4550 || TREE_CODE (type) == QUAL_UNION_TYPE)
4554 else if (TREE_CODE (type) == ARRAY_TYPE)
4557 #ifdef ASM_COMMENT_START
4558 if (field && flag_verbose_asm)
4559 fprintf (asm_out_file, "%s %s:\n",
4562 ? IDENTIFIER_POINTER (DECL_NAME (field))
4566 /* Eliminate the marker that makes a cast not be an lvalue. */
4570 if (index && TREE_CODE (index) == RANGE_EXPR)
4572 unsigned HOST_WIDE_INT fieldsize
4573 = int_size_in_bytes (TREE_TYPE (type));
4574 HOST_WIDE_INT lo_index = tree_low_cst (TREE_OPERAND (index, 0), 0);
4575 HOST_WIDE_INT hi_index = tree_low_cst (TREE_OPERAND (index, 1), 0);
4576 HOST_WIDE_INT index;
4577 unsigned int align2 = min_align (align, fieldsize * BITS_PER_UNIT);
4579 for (index = lo_index; index <= hi_index; index++)
4581 /* Output the element's initial value. */
4583 assemble_zeros (fieldsize);
4585 output_constant (val, fieldsize, align2);
4587 /* Count its size. */
4588 total_bytes += fieldsize;
4591 else if (field == 0 || !DECL_BIT_FIELD (field))
4593 /* An element that is not a bit-field. */
4595 unsigned HOST_WIDE_INT fieldsize;
4596 /* Since this structure is static,
4597 we know the positions are constant. */
4598 HOST_WIDE_INT pos = field ? int_byte_position (field) : 0;
4599 unsigned int align2;
4602 pos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val)), 1)
4603 * (tree_low_cst (index, 0) - tree_low_cst (min_index, 0)));
4605 /* Output any buffered-up bit-fields preceding this element. */
4606 if (byte_buffer_in_use)
4608 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4610 byte_buffer_in_use = 0;
4613 /* Advance to offset of this element.
4614 Note no alignment needed in an array, since that is guaranteed
4615 if each element has the proper size. */
4616 if ((field != 0 || index != 0) && pos != total_bytes)
4618 gcc_assert (pos >= total_bytes);
4619 assemble_zeros (pos - total_bytes);
4623 /* Find the alignment of this element. */
4624 align2 = min_align (align, BITS_PER_UNIT * pos);
4626 /* Determine size this element should occupy. */
4631 /* If this is an array with an unspecified upper bound,
4632 the initializer determines the size. */
4633 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4634 but we cannot do this until the deprecated support for
4635 initializing zero-length array members is removed. */
4636 if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
4637 && TYPE_DOMAIN (TREE_TYPE (field))
4638 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field))))
4640 fieldsize = array_size_for_constructor (val);
4641 /* Given a non-empty initialization, this field had
4643 gcc_assert (!fieldsize || !TREE_CHAIN (field));
4645 else if (DECL_SIZE_UNIT (field))
4647 /* ??? This can't be right. If the decl size overflows
4648 a host integer we will silently emit no data. */
4649 if (host_integerp (DECL_SIZE_UNIT (field), 1))
4650 fieldsize = tree_low_cst (DECL_SIZE_UNIT (field), 1);
4654 fieldsize = int_size_in_bytes (TREE_TYPE (type));
4656 /* Output the element's initial value. */
4658 assemble_zeros (fieldsize);
4660 output_constant (val, fieldsize, align2);
4662 /* Count its size. */
4663 total_bytes += fieldsize;
4665 else if (val != 0 && TREE_CODE (val) != INTEGER_CST)
4666 error ("invalid initial value for member %qs",
4667 IDENTIFIER_POINTER (DECL_NAME (field)));
4670 /* Element that is a bit-field. */
4672 HOST_WIDE_INT next_offset = int_bit_position (field);
4673 HOST_WIDE_INT end_offset
4674 = (next_offset + tree_low_cst (DECL_SIZE (field), 1));
4677 val = integer_zero_node;
4679 /* If this field does not start in this (or, next) byte,
4681 if (next_offset / BITS_PER_UNIT != total_bytes)
4683 /* Output remnant of any bit field in previous bytes. */
4684 if (byte_buffer_in_use)
4686 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4688 byte_buffer_in_use = 0;
4691 /* If still not at proper byte, advance to there. */
4692 if (next_offset / BITS_PER_UNIT != total_bytes)
4694 gcc_assert (next_offset / BITS_PER_UNIT >= total_bytes);
4695 assemble_zeros (next_offset / BITS_PER_UNIT - total_bytes);
4696 total_bytes = next_offset / BITS_PER_UNIT;
4700 if (! byte_buffer_in_use)
4703 /* We must split the element into pieces that fall within
4704 separate bytes, and combine each byte with previous or
4705 following bit-fields. */
4707 /* next_offset is the offset n fbits from the beginning of
4708 the structure to the next bit of this element to be processed.
4709 end_offset is the offset of the first bit past the end of
4711 while (next_offset < end_offset)
4715 HOST_WIDE_INT value;
4716 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4717 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4719 /* Advance from byte to byte
4720 within this element when necessary. */
4721 while (next_byte != total_bytes)
4723 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4728 /* Number of bits we can process at once
4729 (all part of the same byte). */
4730 this_time = MIN (end_offset - next_offset,
4731 BITS_PER_UNIT - next_bit);
4732 if (BYTES_BIG_ENDIAN)
4734 /* On big-endian machine, take the most significant bits
4735 first (of the bits that are significant)
4736 and put them into bytes from the most significant end. */
4737 shift = end_offset - next_offset - this_time;
4739 /* Don't try to take a bunch of bits that cross
4740 the word boundary in the INTEGER_CST. We can
4741 only select bits from the LOW or HIGH part
4743 if (shift < HOST_BITS_PER_WIDE_INT
4744 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4746 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
4747 shift = HOST_BITS_PER_WIDE_INT;
4750 /* Now get the bits from the appropriate constant word. */
4751 if (shift < HOST_BITS_PER_WIDE_INT)
4752 value = TREE_INT_CST_LOW (val);
4755 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4756 value = TREE_INT_CST_HIGH (val);
4757 shift -= HOST_BITS_PER_WIDE_INT;
4760 /* Get the result. This works only when:
4761 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4762 byte |= (((value >> shift)
4763 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4764 << (BITS_PER_UNIT - this_time - next_bit));
4768 /* On little-endian machines,
4769 take first the least significant bits of the value
4770 and pack them starting at the least significant
4771 bits of the bytes. */
4772 shift = next_offset - int_bit_position (field);
4774 /* Don't try to take a bunch of bits that cross
4775 the word boundary in the INTEGER_CST. We can
4776 only select bits from the LOW or HIGH part
4778 if (shift < HOST_BITS_PER_WIDE_INT
4779 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4780 this_time = (HOST_BITS_PER_WIDE_INT - shift);
4782 /* Now get the bits from the appropriate constant word. */
4783 if (shift < HOST_BITS_PER_WIDE_INT)
4784 value = TREE_INT_CST_LOW (val);
4787 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4788 value = TREE_INT_CST_HIGH (val);
4789 shift -= HOST_BITS_PER_WIDE_INT;
4792 /* Get the result. This works only when:
4793 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4794 byte |= (((value >> shift)
4795 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4799 next_offset += this_time;
4800 byte_buffer_in_use = 1;
4805 if (byte_buffer_in_use)
4807 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4811 if ((unsigned HOST_WIDE_INT)total_bytes < size)
4812 assemble_zeros (size - total_bytes);
4815 /* This TREE_LIST contains any weak symbol declarations waiting
4817 static GTY(()) tree weak_decls;
4819 /* Mark DECL as weak. */
4822 mark_weak (tree decl)
4824 DECL_WEAK (decl) = 1;
4826 if (DECL_RTL_SET_P (decl)
4827 && MEM_P (DECL_RTL (decl))
4828 && XEXP (DECL_RTL (decl), 0)
4829 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
4830 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
4833 /* Merge weak status between NEWDECL and OLDDECL. */
4836 merge_weak (tree newdecl, tree olddecl)
4838 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
4840 if (DECL_WEAK (newdecl) && SUPPORTS_WEAK)
4843 /* We put the NEWDECL on the weak_decls list at some point
4844 and OLDDECL as well. Keep just OLDDECL on the list. */
4845 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
4846 if (TREE_VALUE (*pwd) == newdecl)
4848 *pwd = TREE_CHAIN (*pwd);
4855 if (DECL_WEAK (newdecl))
4859 /* NEWDECL is weak, but OLDDECL is not. */
4861 /* If we already output the OLDDECL, we're in trouble; we can't
4862 go back and make it weak. This error cannot caught in
4863 declare_weak because the NEWDECL and OLDDECL was not yet
4864 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4865 if (TREE_ASM_WRITTEN (olddecl))
4866 error ("weak declaration of %q+D must precede definition",
4869 /* If we've already generated rtl referencing OLDDECL, we may
4870 have done so in a way that will not function properly with
4872 else if (TREE_USED (olddecl)
4873 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)))
4874 warning (0, "weak declaration of %q+D after first use results "
4875 "in unspecified behavior", newdecl);
4879 /* We put the NEWDECL on the weak_decls list at some point.
4880 Replace it with the OLDDECL. */
4881 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
4882 if (TREE_VALUE (wd) == newdecl)
4884 TREE_VALUE (wd) = olddecl;
4887 /* We may not find the entry on the list. If NEWDECL is a
4888 weak alias, then we will have already called
4889 globalize_decl to remove the entry; in that case, we do
4890 not need to do anything. */
4893 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4894 mark_weak (olddecl);
4897 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4898 weak. Just update NEWDECL to indicate that it's weak too. */
4899 mark_weak (newdecl);
4902 /* Declare DECL to be a weak symbol. */
4905 declare_weak (tree decl)
4907 if (! TREE_PUBLIC (decl))
4908 error ("weak declaration of %q+D must be public", decl);
4909 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
4910 error ("weak declaration of %q+D must precede definition", decl);
4911 else if (SUPPORTS_WEAK)
4913 if (! DECL_WEAK (decl))
4914 weak_decls = tree_cons (NULL, decl, weak_decls);
4917 warning (0, "weak declaration of %q+D not supported", decl);
4923 weak_finish_1 (tree decl)
4925 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4926 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4929 if (! TREE_USED (decl))
4932 #ifdef ASM_WEAKEN_DECL
4933 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
4935 #ifdef ASM_WEAKEN_LABEL
4936 ASM_WEAKEN_LABEL (asm_out_file, name);
4938 #ifdef ASM_OUTPUT_WEAK_ALIAS
4940 static bool warn_once = 0;
4943 warning (0, "only weak aliases are supported in this configuration");
4953 /* This TREE_LIST contains weakref targets. */
4955 static GTY(()) tree weakref_targets;
4957 /* Forward declaration. */
4958 static tree find_decl_and_mark_needed (tree decl, tree target);
4960 /* Emit any pending weak declarations. */
4967 for (t = weakref_targets; t; t = TREE_CHAIN (t))
4969 tree alias_decl = TREE_PURPOSE (t);
4970 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
4972 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
4973 /* Remove alias_decl from the weak list, but leave entries for
4974 the target alone. */
4976 #ifndef ASM_OUTPUT_WEAKREF
4977 else if (! TREE_SYMBOL_REFERENCED (target))
4979 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
4980 defined, otherwise we and weak_finish_1 would use a
4981 different macros. */
4982 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
4983 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
4985 tree decl = find_decl_and_mark_needed (alias_decl, target);
4989 decl = build_decl (TREE_CODE (alias_decl), target,
4990 TREE_TYPE (alias_decl));
4992 DECL_EXTERNAL (decl) = 1;
4993 TREE_PUBLIC (decl) = 1;
4994 DECL_ARTIFICIAL (decl) = 1;
4995 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
4996 TREE_USED (decl) = 1;
4999 weak_finish_1 (decl);
5008 /* Remove the alias and the target from the pending weak list
5009 so that we do not emit any .weak directives for the former,
5010 nor multiple .weak directives for the latter. */
5011 for (p = &weak_decls; (t2 = *p) ; )
5013 if (TREE_VALUE (t2) == alias_decl
5014 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
5015 *p = TREE_CHAIN (t2);
5017 p = &TREE_CHAIN (t2);
5020 /* Remove other weakrefs to the same target, to speed things up. */
5021 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
5023 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
5024 *p = TREE_CHAIN (t2);
5026 p = &TREE_CHAIN (t2);
5031 for (t = weak_decls; t; t = TREE_CHAIN (t))
5033 tree decl = TREE_VALUE (t);
5035 weak_finish_1 (decl);
5039 /* Emit the assembly bits to indicate that DECL is globally visible. */
5042 globalize_decl (tree decl)
5045 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5046 if (DECL_WEAK (decl))
5048 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
5051 #ifdef ASM_WEAKEN_DECL
5052 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
5054 ASM_WEAKEN_LABEL (asm_out_file, name);
5057 /* Remove this function from the pending weak list so that
5058 we do not emit multiple .weak directives for it. */
5059 for (p = &weak_decls; (t = *p) ; )
5061 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5062 *p = TREE_CHAIN (t);
5064 p = &TREE_CHAIN (t);
5067 /* Remove weakrefs to the same target from the pending weakref
5068 list, for the same reason. */
5069 for (p = &weakref_targets; (t = *p) ; )
5071 if (DECL_ASSEMBLER_NAME (decl)
5072 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5073 *p = TREE_CHAIN (t);
5075 p = &TREE_CHAIN (t);
5082 targetm.asm_out.globalize_decl_name (asm_out_file, decl);
5085 /* We have to be able to tell cgraph about the needed-ness of the target
5086 of an alias. This requires that the decl have been defined. Aliases
5087 that precede their definition have to be queued for later processing. */
5089 typedef struct alias_pair GTY(())
5095 /* Define gc'd vector type. */
5096 DEF_VEC_O(alias_pair);
5097 DEF_VEC_ALLOC_O(alias_pair,gc);
5099 static GTY(()) VEC(alias_pair,gc) *alias_pairs;
5101 /* Given an assembly name, find the decl it is associated with. At the
5102 same time, mark it needed for cgraph. */
5105 find_decl_and_mark_needed (tree decl, tree target)
5107 struct cgraph_node *fnode = NULL;
5108 struct varpool_node *vnode = NULL;
5110 if (TREE_CODE (decl) == FUNCTION_DECL)
5112 fnode = cgraph_node_for_asm (target);
5114 vnode = varpool_node_for_asm (target);
5118 vnode = varpool_node_for_asm (target);
5120 fnode = cgraph_node_for_asm (target);
5125 /* We can't mark function nodes as used after cgraph global info
5126 is finished. This wouldn't generally be necessary, but C++
5127 virtual table thunks are introduced late in the game and
5128 might seem like they need marking, although in fact they
5130 if (! cgraph_global_info_ready)
5131 cgraph_mark_needed_node (fnode);
5136 varpool_mark_needed_node (vnode);
5143 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5144 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5145 tree node is DECL to have the value of the tree node TARGET. */
5148 do_assemble_alias (tree decl, tree target)
5150 if (TREE_ASM_WRITTEN (decl))
5153 TREE_ASM_WRITTEN (decl) = 1;
5154 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
5156 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5158 ultimate_transparent_alias_target (&target);
5160 if (!targetm.have_tls
5161 && TREE_CODE (decl) == VAR_DECL
5162 && DECL_THREAD_LOCAL_P (decl))
5164 decl = emutls_decl (decl);
5165 target = get_emutls_object_name (target);
5168 if (!TREE_SYMBOL_REFERENCED (target))
5169 weakref_targets = tree_cons (decl, target, weakref_targets);
5171 #ifdef ASM_OUTPUT_WEAKREF
5172 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
5173 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5174 IDENTIFIER_POINTER (target));
5178 error ("%Jweakref is not supported in this configuration", decl);
5185 if (!targetm.have_tls
5186 && TREE_CODE (decl) == VAR_DECL
5187 && DECL_THREAD_LOCAL_P (decl))
5189 decl = emutls_decl (decl);
5190 target = get_emutls_object_name (target);
5193 #ifdef ASM_OUTPUT_DEF
5194 /* Make name accessible from other files, if appropriate. */
5196 if (TREE_PUBLIC (decl))
5198 globalize_decl (decl);
5199 maybe_assemble_visibility (decl);
5202 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5203 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
5205 ASM_OUTPUT_DEF (asm_out_file,
5206 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5207 IDENTIFIER_POINTER (target));
5209 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5214 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5215 # ifdef ASM_WEAKEN_DECL
5216 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
5218 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
5220 /* Remove this function from the pending weak list so that
5221 we do not emit multiple .weak directives for it. */
5222 for (p = &weak_decls; (t = *p) ; )
5223 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5224 *p = TREE_CHAIN (t);
5226 p = &TREE_CHAIN (t);
5228 /* Remove weakrefs to the same target from the pending weakref
5229 list, for the same reason. */
5230 for (p = &weakref_targets; (t = *p) ; )
5232 if (DECL_ASSEMBLER_NAME (decl)
5233 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5234 *p = TREE_CHAIN (t);
5236 p = &TREE_CHAIN (t);
5242 /* First pass of completing pending aliases. Make sure that cgraph knows
5243 which symbols will be required. */
5246 finish_aliases_1 (void)
5251 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5255 target_decl = find_decl_and_mark_needed (p->decl, p->target);
5256 if (target_decl == NULL)
5258 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5259 error ("%q+D aliased to undefined symbol %qs",
5260 p->decl, IDENTIFIER_POINTER (p->target));
5262 else if (DECL_EXTERNAL (target_decl)
5263 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5264 error ("%q+D aliased to external symbol %qs",
5265 p->decl, IDENTIFIER_POINTER (p->target));
5269 /* Second pass of completing pending aliases. Emit the actual assembly.
5270 This happens at the end of compilation and thus it is assured that the
5271 target symbol has been emitted. */
5274 finish_aliases_2 (void)
5279 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5280 do_assemble_alias (p->decl, p->target);
5282 VEC_truncate (alias_pair, alias_pairs, 0);
5285 /* Emit an assembler directive to make the symbol for DECL an alias to
5286 the symbol for TARGET. */
5289 assemble_alias (tree decl, tree target)
5292 bool is_weakref = false;
5294 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5296 tree alias = DECL_ASSEMBLER_NAME (decl);
5300 ultimate_transparent_alias_target (&target);
5302 if (alias == target)
5303 error ("weakref %q+D ultimately targets itself", decl);
5306 #ifndef ASM_OUTPUT_WEAKREF
5307 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
5308 TREE_CHAIN (alias) = target;
5311 if (TREE_PUBLIC (decl))
5312 error ("weakref %q+D must have static linkage", decl);
5316 #if !defined (ASM_OUTPUT_DEF)
5317 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5318 error ("%Jalias definitions not supported in this configuration", decl);
5321 if (!DECL_WEAK (decl))
5323 error ("%Jonly weak aliases are supported in this configuration", decl);
5330 /* We must force creation of DECL_RTL for debug info generation, even though
5331 we don't use it here. */
5332 make_decl_rtl (decl);
5333 TREE_USED (decl) = 1;
5335 /* A quirk of the initial implementation of aliases required that the user
5336 add "extern" to all of them. Which is silly, but now historical. Do
5337 note that the symbol is in fact locally defined. */
5339 DECL_EXTERNAL (decl) = 0;
5341 /* Allow aliases to aliases. */
5342 if (TREE_CODE (decl) == FUNCTION_DECL)
5343 cgraph_node (decl)->alias = true;
5345 varpool_node (decl)->alias = true;
5347 /* If the target has already been emitted, we don't have to queue the
5348 alias. This saves a tad o memory. */
5349 target_decl = find_decl_and_mark_needed (decl, target);
5350 if (target_decl && TREE_ASM_WRITTEN (target_decl))
5351 do_assemble_alias (decl, target);
5354 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
5360 /* Emit an assembler directive to set symbol for DECL visibility to
5361 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5364 default_assemble_visibility (tree decl, int vis)
5366 static const char * const visibility_types[] = {
5367 NULL, "protected", "hidden", "internal"
5370 const char *name, *type;
5372 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5373 type = visibility_types[vis];
5375 #ifdef HAVE_GAS_HIDDEN
5376 fprintf (asm_out_file, "\t.%s\t", type);
5377 assemble_name (asm_out_file, name);
5378 fprintf (asm_out_file, "\n");
5380 warning (OPT_Wattributes, "visibility attribute not supported "
5381 "in this configuration; ignored");
5385 /* A helper function to call assemble_visibility when needed for a decl. */
5388 maybe_assemble_visibility (tree decl)
5390 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5392 if (vis != VISIBILITY_DEFAULT)
5394 targetm.asm_out.visibility (decl, vis);
5401 /* Returns 1 if the target configuration supports defining public symbols
5402 so that one of them will be chosen at link time instead of generating a
5403 multiply-defined symbol error, whether through the use of weak symbols or
5404 a target-specific mechanism for having duplicates discarded. */
5407 supports_one_only (void)
5409 if (SUPPORTS_ONE_ONLY)
5411 return SUPPORTS_WEAK;
5414 /* Set up DECL as a public symbol that can be defined in multiple
5415 translation units without generating a linker error. */
5418 make_decl_one_only (tree decl)
5420 gcc_assert (TREE_CODE (decl) == VAR_DECL
5421 || TREE_CODE (decl) == FUNCTION_DECL);
5423 TREE_PUBLIC (decl) = 1;
5425 if (SUPPORTS_ONE_ONLY)
5427 #ifdef MAKE_DECL_ONE_ONLY
5428 MAKE_DECL_ONE_ONLY (decl);
5430 DECL_ONE_ONLY (decl) = 1;
5432 else if (TREE_CODE (decl) == VAR_DECL
5433 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
5434 DECL_COMMON (decl) = 1;
5437 gcc_assert (SUPPORTS_WEAK);
5438 DECL_WEAK (decl) = 1;
5443 init_varasm_once (void)
5445 section_htab = htab_create_ggc (31, section_entry_hash,
5446 section_entry_eq, NULL);
5447 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
5448 object_block_entry_eq, NULL);
5449 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
5450 const_desc_eq, NULL);
5452 const_alias_set = new_alias_set ();
5453 shared_constant_pool = create_constant_pool ();
5455 #ifdef TEXT_SECTION_ASM_OP
5456 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
5457 TEXT_SECTION_ASM_OP);
5460 #ifdef DATA_SECTION_ASM_OP
5461 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5462 DATA_SECTION_ASM_OP);
5465 #ifdef SDATA_SECTION_ASM_OP
5466 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5467 SDATA_SECTION_ASM_OP);
5470 #ifdef READONLY_DATA_SECTION_ASM_OP
5471 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
5472 READONLY_DATA_SECTION_ASM_OP);
5475 #ifdef CTORS_SECTION_ASM_OP
5476 ctors_section = get_unnamed_section (0, output_section_asm_op,
5477 CTORS_SECTION_ASM_OP);
5480 #ifdef DTORS_SECTION_ASM_OP
5481 dtors_section = get_unnamed_section (0, output_section_asm_op,
5482 DTORS_SECTION_ASM_OP);
5485 #ifdef BSS_SECTION_ASM_OP
5486 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5487 output_section_asm_op,
5488 BSS_SECTION_ASM_OP);
5491 #ifdef SBSS_SECTION_ASM_OP
5492 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5493 output_section_asm_op,
5494 SBSS_SECTION_ASM_OP);
5497 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5498 | SECTION_COMMON, emit_tls_common);
5499 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5500 | SECTION_COMMON, emit_local);
5501 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5502 | SECTION_COMMON, emit_common);
5504 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5505 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
5509 targetm.asm_out.init_sections ();
5511 if (readonly_data_section == NULL)
5512 readonly_data_section = text_section;
5516 decl_default_tls_model (tree decl)
5518 enum tls_model kind;
5521 is_local = targetm.binds_local_p (decl);
5525 kind = TLS_MODEL_LOCAL_EXEC;
5527 kind = TLS_MODEL_INITIAL_EXEC;
5530 /* Local dynamic is inefficient when we're not combining the
5531 parts of the address. */
5532 else if (optimize && is_local)
5533 kind = TLS_MODEL_LOCAL_DYNAMIC;
5535 kind = TLS_MODEL_GLOBAL_DYNAMIC;
5536 if (kind < flag_tls_default)
5537 kind = flag_tls_default;
5542 /* Select a set of attributes for section NAME based on the properties
5543 of DECL and whether or not RELOC indicates that DECL's initializer
5544 might contain runtime relocations.
5546 We make the section read-only and executable for a function decl,
5547 read-only for a const data decl, and writable for a non-const data decl. */
5550 default_section_type_flags (tree decl, const char *name, int reloc)
5554 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
5555 flags = SECTION_CODE;
5556 else if (decl && decl_readonly_section (decl, reloc))
5558 else if (current_function_decl
5560 && cfun->unlikely_text_section_name
5561 && strcmp (name, cfun->unlikely_text_section_name) == 0)
5562 flags = SECTION_CODE;
5564 && (!current_function_decl || !cfun)
5565 && strcmp (name, UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5566 flags = SECTION_CODE;
5568 flags = SECTION_WRITE;
5570 if (decl && DECL_ONE_ONLY (decl))
5571 flags |= SECTION_LINKONCE;
5573 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5574 flags |= SECTION_TLS | SECTION_WRITE;
5576 if (strcmp (name, ".bss") == 0
5577 || strncmp (name, ".bss.", 5) == 0
5578 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
5579 || strcmp (name, ".sbss") == 0
5580 || strncmp (name, ".sbss.", 6) == 0
5581 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
5582 flags |= SECTION_BSS;
5584 if (strcmp (name, ".tdata") == 0
5585 || strncmp (name, ".tdata.", 7) == 0
5586 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
5587 flags |= SECTION_TLS;
5589 if (strcmp (name, ".tbss") == 0
5590 || strncmp (name, ".tbss.", 6) == 0
5591 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
5592 flags |= SECTION_TLS | SECTION_BSS;
5594 /* These three sections have special ELF types. They are neither
5595 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5596 want to print a section type (@progbits or @nobits). If someone
5597 is silly enough to emit code or TLS variables to one of these
5598 sections, then don't handle them specially. */
5599 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
5600 && (strcmp (name, ".init_array") == 0
5601 || strcmp (name, ".fini_array") == 0
5602 || strcmp (name, ".preinit_array") == 0))
5603 flags |= SECTION_NOTYPE;
5608 /* Return true if the target supports some form of global BSS,
5609 either through bss_noswitch_section, or by selecting a BSS
5610 section in TARGET_ASM_SELECT_SECTION. */
5613 have_global_bss_p (void)
5615 return bss_noswitch_section || targetm.have_switchable_bss_sections;
5618 /* Output assembly to switch to section NAME with attribute FLAGS.
5619 Four variants for common object file formats. */
5622 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
5623 unsigned int flags ATTRIBUTE_UNUSED,
5624 tree decl ATTRIBUTE_UNUSED)
5626 /* Some object formats don't support named sections at all. The
5627 front-end should already have flagged this as an error. */
5632 default_elf_asm_named_section (const char *name, unsigned int flags,
5633 tree decl ATTRIBUTE_UNUSED)
5635 char flagchars[10], *f = flagchars;
5637 /* If we have already declared this section, we can use an
5638 abbreviated form to switch back to it -- unless this section is
5639 part of a COMDAT groups, in which case GAS requires the full
5640 declaration every time. */
5641 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5642 && (flags & SECTION_DECLARED))
5644 fprintf (asm_out_file, "\t.section\t%s\n", name);
5648 if (!(flags & SECTION_DEBUG))
5650 if (flags & SECTION_WRITE)
5652 if (flags & SECTION_CODE)
5654 if (flags & SECTION_SMALL)
5656 if (flags & SECTION_MERGE)
5658 if (flags & SECTION_STRINGS)
5660 if (flags & SECTION_TLS)
5662 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5666 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
5668 if (!(flags & SECTION_NOTYPE))
5673 if (flags & SECTION_BSS)
5679 #ifdef ASM_COMMENT_START
5680 /* On platforms that use "@" as the assembly comment character,
5682 if (strcmp (ASM_COMMENT_START, "@") == 0)
5685 fprintf (asm_out_file, format, type);
5687 if (flags & SECTION_ENTSIZE)
5688 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
5689 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5690 fprintf (asm_out_file, ",%s,comdat",
5691 lang_hooks.decls.comdat_group (decl));
5694 putc ('\n', asm_out_file);
5698 default_coff_asm_named_section (const char *name, unsigned int flags,
5699 tree decl ATTRIBUTE_UNUSED)
5701 char flagchars[8], *f = flagchars;
5703 if (flags & SECTION_WRITE)
5705 if (flags & SECTION_CODE)
5709 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
5713 default_pe_asm_named_section (const char *name, unsigned int flags,
5716 default_coff_asm_named_section (name, flags, decl);
5718 if (flags & SECTION_LINKONCE)
5720 /* Functions may have been compiled at various levels of
5721 optimization so we can't use `same_size' here.
5722 Instead, have the linker pick one. */
5723 fprintf (asm_out_file, "\t.linkonce %s\n",
5724 (flags & SECTION_CODE ? "discard" : "same_size"));
5728 /* The lame default section selector. */
5731 default_select_section (tree decl, int reloc,
5732 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5736 if (decl_readonly_section (decl, reloc))
5737 return readonly_data_section;
5739 else if (TREE_CODE (decl) == CONSTRUCTOR)
5741 if (! ((flag_pic && reloc)
5742 || !TREE_READONLY (decl)
5743 || TREE_SIDE_EFFECTS (decl)
5744 || !TREE_CONSTANT (decl)))
5745 return readonly_data_section;
5747 else if (TREE_CODE (decl) == STRING_CST)
5748 return readonly_data_section;
5749 else if (! (flag_pic && reloc))
5750 return readonly_data_section;
5752 return data_section;
5755 enum section_category
5756 categorize_decl_for_section (tree decl, int reloc)
5758 enum section_category ret;
5760 if (TREE_CODE (decl) == FUNCTION_DECL)
5762 else if (TREE_CODE (decl) == STRING_CST)
5764 if (flag_mudflap) /* or !flag_merge_constants */
5765 return SECCAT_RODATA;
5767 return SECCAT_RODATA_MERGE_STR;
5769 else if (TREE_CODE (decl) == VAR_DECL)
5771 if (bss_initializer_p (decl))
5773 else if (! TREE_READONLY (decl)
5774 || TREE_SIDE_EFFECTS (decl)
5775 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
5777 /* Here the reloc_rw_mask is not testing whether the section should
5778 be read-only or not, but whether the dynamic link will have to
5779 do something. If so, we wish to segregate the data in order to
5780 minimize cache misses inside the dynamic linker. */
5781 if (reloc & targetm.asm_out.reloc_rw_mask ())
5782 ret = reloc == 1 ? SECCAT_DATA_REL_LOCAL : SECCAT_DATA_REL;
5786 else if (reloc & targetm.asm_out.reloc_rw_mask ())
5787 ret = reloc == 1 ? SECCAT_DATA_REL_RO_LOCAL : SECCAT_DATA_REL_RO;
5788 else if (reloc || flag_merge_constants < 2)
5789 /* C and C++ don't allow different variables to share the same
5790 location. -fmerge-all-constants allows even that (at the
5791 expense of not conforming). */
5792 ret = SECCAT_RODATA;
5793 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
5794 ret = SECCAT_RODATA_MERGE_STR_INIT;
5796 ret = SECCAT_RODATA_MERGE_CONST;
5798 else if (TREE_CODE (decl) == CONSTRUCTOR)
5800 if ((reloc & targetm.asm_out.reloc_rw_mask ())
5801 || TREE_SIDE_EFFECTS (decl)
5802 || ! TREE_CONSTANT (decl))
5805 ret = SECCAT_RODATA;
5808 ret = SECCAT_RODATA;
5810 /* There are no read-only thread-local sections. */
5811 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5813 /* Note that this would be *just* SECCAT_BSS, except that there's
5814 no concept of a read-only thread-local-data section. */
5815 if (ret == SECCAT_BSS
5816 || (flag_zero_initialized_in_bss
5817 && initializer_zerop (DECL_INITIAL (decl))))
5823 /* If the target uses small data sections, select it. */
5824 else if (targetm.in_small_data_p (decl))
5826 if (ret == SECCAT_BSS)
5828 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
5829 ret = SECCAT_SRODATA;
5838 decl_readonly_section (tree decl, int reloc)
5840 switch (categorize_decl_for_section (decl, reloc))
5843 case SECCAT_RODATA_MERGE_STR:
5844 case SECCAT_RODATA_MERGE_STR_INIT:
5845 case SECCAT_RODATA_MERGE_CONST:
5846 case SECCAT_SRODATA:
5855 /* Select a section based on the above categorization. */
5858 default_elf_select_section (tree decl, int reloc,
5859 unsigned HOST_WIDE_INT align)
5862 switch (categorize_decl_for_section (decl, reloc))
5865 /* We're not supposed to be called on FUNCTION_DECLs. */
5868 return readonly_data_section;
5869 case SECCAT_RODATA_MERGE_STR:
5870 return mergeable_string_section (decl, align, 0);
5871 case SECCAT_RODATA_MERGE_STR_INIT:
5872 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
5873 case SECCAT_RODATA_MERGE_CONST:
5874 return mergeable_constant_section (DECL_MODE (decl), align, 0);
5875 case SECCAT_SRODATA:
5879 return data_section;
5880 case SECCAT_DATA_REL:
5881 sname = ".data.rel";
5883 case SECCAT_DATA_REL_LOCAL:
5884 sname = ".data.rel.local";
5886 case SECCAT_DATA_REL_RO:
5887 sname = ".data.rel.ro";
5889 case SECCAT_DATA_REL_RO_LOCAL:
5890 sname = ".data.rel.ro.local";
5915 return get_named_section (decl, sname, reloc);
5918 /* Construct a unique section name based on the decl name and the
5919 categorization performed above. */
5922 default_unique_section (tree decl, int reloc)
5924 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
5925 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
5926 const char *prefix, *name;
5930 switch (categorize_decl_for_section (decl, reloc))
5933 prefix = one_only ? ".gnu.linkonce.t." : ".text.";
5936 case SECCAT_RODATA_MERGE_STR:
5937 case SECCAT_RODATA_MERGE_STR_INIT:
5938 case SECCAT_RODATA_MERGE_CONST:
5939 prefix = one_only ? ".gnu.linkonce.r." : ".rodata.";
5941 case SECCAT_SRODATA:
5942 prefix = one_only ? ".gnu.linkonce.s2." : ".sdata2.";
5945 prefix = one_only ? ".gnu.linkonce.d." : ".data.";
5947 case SECCAT_DATA_REL:
5948 prefix = one_only ? ".gnu.linkonce.d.rel." : ".data.rel.";
5950 case SECCAT_DATA_REL_LOCAL:
5951 prefix = one_only ? ".gnu.linkonce.d.rel.local." : ".data.rel.local.";
5953 case SECCAT_DATA_REL_RO:
5954 prefix = one_only ? ".gnu.linkonce.d.rel.ro." : ".data.rel.ro.";
5956 case SECCAT_DATA_REL_RO_LOCAL:
5957 prefix = one_only ? ".gnu.linkonce.d.rel.ro.local."
5958 : ".data.rel.ro.local.";
5961 prefix = one_only ? ".gnu.linkonce.s." : ".sdata.";
5964 prefix = one_only ? ".gnu.linkonce.b." : ".bss.";
5967 prefix = one_only ? ".gnu.linkonce.sb." : ".sbss.";
5970 prefix = one_only ? ".gnu.linkonce.td." : ".tdata.";
5973 prefix = one_only ? ".gnu.linkonce.tb." : ".tbss.";
5978 plen = strlen (prefix);
5980 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5981 name = targetm.strip_name_encoding (name);
5982 nlen = strlen (name);
5984 string = alloca (nlen + plen + 1);
5985 memcpy (string, prefix, plen);
5986 memcpy (string + plen, name, nlen + 1);
5988 DECL_SECTION_NAME (decl) = build_string (nlen + plen, string);
5991 /* Like compute_reloc_for_constant, except for an RTX. The return value
5992 is a mask for which bit 1 indicates a global relocation, and bit 0
5993 indicates a local relocation. */
5996 compute_reloc_for_rtx_1 (rtx *xp, void *data)
6001 switch (GET_CODE (x))
6004 *preloc |= SYMBOL_REF_LOCAL_P (x) ? 1 : 2;
6017 compute_reloc_for_rtx (rtx x)
6021 switch (GET_CODE (x))
6027 for_each_rtx (&x, compute_reloc_for_rtx_1, &reloc);
6036 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
6038 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6040 if (compute_reloc_for_rtx (x) & targetm.asm_out.reloc_rw_mask ())
6041 return data_section;
6043 return readonly_data_section;
6047 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
6048 unsigned HOST_WIDE_INT align)
6050 int reloc = compute_reloc_for_rtx (x);
6052 /* ??? Handle small data here somehow. */
6054 if (reloc & targetm.asm_out.reloc_rw_mask ())
6057 return get_named_section (NULL, ".data.rel.ro.local", 1);
6059 return get_named_section (NULL, ".data.rel.ro", 3);
6062 return mergeable_constant_section (mode, align, 0);
6065 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6068 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
6073 /* Careful not to prod global register variables. */
6076 symbol = XEXP (rtl, 0);
6077 if (GET_CODE (symbol) != SYMBOL_REF)
6080 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
6081 if (TREE_CODE (decl) == FUNCTION_DECL)
6082 flags |= SYMBOL_FLAG_FUNCTION;
6083 if (targetm.binds_local_p (decl))
6084 flags |= SYMBOL_FLAG_LOCAL;
6085 if (targetm.have_tls && TREE_CODE (decl) == VAR_DECL
6086 && DECL_THREAD_LOCAL_P (decl))
6087 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
6088 else if (targetm.in_small_data_p (decl))
6089 flags |= SYMBOL_FLAG_SMALL;
6090 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6091 being PUBLIC, the thing *must* be defined in this translation unit.
6092 Prevent this buglet from being propagated into rtl code as well. */
6093 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
6094 flags |= SYMBOL_FLAG_EXTERNAL;
6096 SYMBOL_REF_FLAGS (symbol) = flags;
6099 /* By default, we do nothing for encode_section_info, so we need not
6100 do anything but discard the '*' marker. */
6103 default_strip_name_encoding (const char *str)
6105 return str + (*str == '*');
6108 #ifdef ASM_OUTPUT_DEF
6109 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6110 anchor relative to ".", the current section position. */
6113 default_asm_output_anchor (rtx symbol)
6117 sprintf (buffer, "*. + " HOST_WIDE_INT_PRINT_DEC,
6118 SYMBOL_REF_BLOCK_OFFSET (symbol));
6119 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
6123 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6126 default_use_anchors_for_symbol_p (rtx symbol)
6131 /* Don't use anchors for mergeable sections. The linker might move
6132 the objects around. */
6133 sect = SYMBOL_REF_BLOCK (symbol)->sect;
6134 if (sect->common.flags & SECTION_MERGE)
6137 /* Don't use anchors for small data sections. The small data register
6138 acts as an anchor for such sections. */
6139 if (sect->common.flags & SECTION_SMALL)
6142 decl = SYMBOL_REF_DECL (symbol);
6143 if (decl && DECL_P (decl))
6145 /* Don't use section anchors for decls that might be defined by
6147 if (!targetm.binds_local_p (decl))
6150 /* Don't use section anchors for decls that will be placed in a
6151 small data section. */
6152 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6153 one above. The problem is that we only use SECTION_SMALL for
6154 sections that should be marked as small in the section directive. */
6155 if (targetm.in_small_data_p (decl))
6161 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6162 wrt cross-module name binding. */
6165 default_binds_local_p (tree exp)
6167 return default_binds_local_p_1 (exp, flag_shlib);
6171 default_binds_local_p_1 (tree exp, int shlib)
6175 /* A non-decl is an entry in the constant pool. */
6178 /* Weakrefs may not bind locally, even though the weakref itself is
6179 always static and therefore local. */
6180 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp)))
6182 /* Static variables are always local. */
6183 else if (! TREE_PUBLIC (exp))
6185 /* A variable is local if the user has said explicitly that it will
6187 else if (DECL_VISIBILITY_SPECIFIED (exp)
6188 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6190 /* Variables defined outside this object might not be local. */
6191 else if (DECL_EXTERNAL (exp))
6193 /* If defined in this object and visibility is not default, must be
6195 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6197 /* Default visibility weak data can be overridden by a strong symbol
6198 in another module and so are not local. */
6199 else if (DECL_WEAK (exp))
6201 /* If PIC, then assume that any global name can be overridden by
6202 symbols resolved from other modules. */
6205 /* Uninitialized COMMON variable may be unified with symbols
6206 resolved from other modules. */
6207 else if (DECL_COMMON (exp)
6208 && (DECL_INITIAL (exp) == NULL
6209 || DECL_INITIAL (exp) == error_mark_node))
6211 /* Otherwise we're left with initialized (or non-common) global data
6212 which is of necessity defined locally. */
6219 /* Determine whether or not a pointer mode is valid. Assume defaults
6220 of ptr_mode or Pmode - can be overridden. */
6222 default_valid_pointer_mode (enum machine_mode mode)
6224 return (mode == ptr_mode || mode == Pmode);
6227 /* Default function to output code that will globalize a label. A
6228 target must define GLOBAL_ASM_OP or provide its own function to
6229 globalize a label. */
6230 #ifdef GLOBAL_ASM_OP
6232 default_globalize_label (FILE * stream, const char *name)
6234 fputs (GLOBAL_ASM_OP, stream);
6235 assemble_name (stream, name);
6236 putc ('\n', stream);
6238 #endif /* GLOBAL_ASM_OP */
6240 /* Default function to output code that will globalize a declaration. */
6242 default_globalize_decl_name (FILE * stream, tree decl)
6244 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
6245 targetm.asm_out.globalize_label (stream, name);
6248 /* Default function to output a label for unwind information. The
6249 default is to do nothing. A target that needs nonlocal labels for
6250 unwind information must provide its own function to do this. */
6252 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
6253 tree decl ATTRIBUTE_UNUSED,
6254 int for_eh ATTRIBUTE_UNUSED,
6255 int empty ATTRIBUTE_UNUSED)
6259 /* Default function to output a label to divide up the exception table.
6260 The default is to do nothing. A target that needs/wants to divide
6261 up the table must provide it's own function to do this. */
6263 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
6267 /* This is how to output an internal numbered label where PREFIX is
6268 the class of label and LABELNO is the number within the class. */
6271 default_internal_label (FILE *stream, const char *prefix,
6272 unsigned long labelno)
6274 char *const buf = alloca (40 + strlen (prefix));
6275 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
6276 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
6279 /* This is the default behavior at the beginning of a file. It's
6280 controlled by two other target-hook toggles. */
6282 default_file_start (void)
6284 if (targetm.file_start_app_off && !flag_verbose_asm)
6285 fputs (ASM_APP_OFF, asm_out_file);
6287 if (targetm.file_start_file_directive)
6288 output_file_directive (asm_out_file, main_input_filename);
6291 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6292 which emits a special section directive used to indicate whether or
6293 not this object file needs an executable stack. This is primarily
6294 a GNU extension to ELF but could be used on other targets. */
6296 int trampolines_created;
6299 file_end_indicate_exec_stack (void)
6301 unsigned int flags = SECTION_DEBUG;
6302 if (trampolines_created)
6303 flags |= SECTION_CODE;
6305 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
6308 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6309 a get_unnamed_section callback. */
6312 output_section_asm_op (const void *directive)
6314 fprintf (asm_out_file, "%s\n", (const char *) directive);
6317 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6318 the current section is NEW_SECTION. */
6321 switch_to_section (section *new_section)
6323 if (in_section == new_section)
6326 if (new_section->common.flags & SECTION_FORGET)
6329 in_section = new_section;
6331 switch (SECTION_STYLE (new_section))
6335 && !cfun->unlikely_text_section_name
6336 && strcmp (new_section->named.name,
6337 UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
6338 cfun->unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
6340 targetm.asm_out.named_section (new_section->named.name,
6341 new_section->named.common.flags,
6342 new_section->named.decl);
6345 case SECTION_UNNAMED:
6346 new_section->unnamed.callback (new_section->unnamed.data);
6349 case SECTION_NOSWITCH:
6354 new_section->common.flags |= SECTION_DECLARED;
6357 /* If block symbol SYMBOL has not yet been assigned an offset, place
6358 it at the end of its block. */
6361 place_block_symbol (rtx symbol)
6363 unsigned HOST_WIDE_INT size, mask, offset;
6364 struct constant_descriptor_rtx *desc;
6365 unsigned int alignment;
6366 struct object_block *block;
6369 gcc_assert (SYMBOL_REF_BLOCK (symbol));
6370 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
6373 /* Work out the symbol's size and alignment. */
6374 if (CONSTANT_POOL_ADDRESS_P (symbol))
6376 desc = SYMBOL_REF_CONSTANT (symbol);
6377 alignment = desc->align;
6378 size = GET_MODE_SIZE (desc->mode);
6380 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6382 decl = SYMBOL_REF_DECL (symbol);
6383 alignment = get_constant_alignment (decl);
6384 size = get_constant_size (decl);
6388 decl = SYMBOL_REF_DECL (symbol);
6389 alignment = DECL_ALIGN (decl);
6390 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6393 /* Calculate the object's offset from the start of the block. */
6394 block = SYMBOL_REF_BLOCK (symbol);
6395 mask = alignment / BITS_PER_UNIT - 1;
6396 offset = (block->size + mask) & ~mask;
6397 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
6399 /* Record the block's new alignment and size. */
6400 block->alignment = MAX (block->alignment, alignment);
6401 block->size = offset + size;
6403 VEC_safe_push (rtx, gc, block->objects, symbol);
6406 /* Return the anchor that should be used to address byte offset OFFSET
6407 from the first object in BLOCK. MODEL is the TLS model used
6411 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
6412 enum tls_model model)
6415 unsigned int begin, middle, end;
6416 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
6419 /* Work out the anchor's offset. Use an offset of 0 for the first
6420 anchor so that we don't pessimize the case where we take the address
6421 of a variable at the beginning of the block. This is particularly
6422 useful when a block has only one variable assigned to it.
6424 We try to place anchors RANGE bytes apart, so there can then be
6425 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6426 a ptr_mode offset. With some target settings, the lowest such
6427 anchor might be out of range for the lowest ptr_mode offset;
6428 likewise the highest anchor for the highest offset. Use anchors
6429 at the extreme ends of the ptr_mode range in such cases.
6431 All arithmetic uses unsigned integers in order to avoid
6433 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
6434 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
6435 range = max_offset - min_offset + 1;
6440 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
6443 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
6444 delta -= delta % range;
6447 offset = (HOST_WIDE_INT) (-delta);
6451 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
6452 delta -= delta % range;
6453 if (delta > bias - 1)
6455 offset = (HOST_WIDE_INT) delta;
6459 /* Do a binary search to see if there's already an anchor we can use.
6460 Set BEGIN to the new anchor's index if not. */
6462 end = VEC_length (rtx, block->anchors);
6463 while (begin != end)
6465 middle = (end + begin) / 2;
6466 anchor = VEC_index (rtx, block->anchors, middle);
6467 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
6469 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
6471 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
6473 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
6479 /* Create a new anchor with a unique label. */
6480 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
6481 anchor = create_block_symbol (ggc_strdup (label), block, offset);
6482 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
6483 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
6485 /* Insert it at index BEGIN. */
6486 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
6490 /* Output the objects in BLOCK. */
6493 output_object_block (struct object_block *block)
6495 struct constant_descriptor_rtx *desc;
6497 HOST_WIDE_INT offset;
6501 if (block->objects == NULL)
6504 /* Switch to the section and make sure that the first byte is
6505 suitably aligned. */
6506 switch_to_section (block->sect);
6507 assemble_align (block->alignment);
6509 /* Define the values of all anchors relative to the current section
6511 for (i = 0; VEC_iterate (rtx, block->anchors, i, symbol); i++)
6512 targetm.asm_out.output_anchor (symbol);
6514 /* Output the objects themselves. */
6516 for (i = 0; VEC_iterate (rtx, block->objects, i, symbol); i++)
6518 /* Move to the object's offset, padding with zeros if necessary. */
6519 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
6520 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
6521 if (CONSTANT_POOL_ADDRESS_P (symbol))
6523 desc = SYMBOL_REF_CONSTANT (symbol);
6524 output_constant_pool_1 (desc, 1);
6525 offset += GET_MODE_SIZE (desc->mode);
6527 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6529 decl = SYMBOL_REF_DECL (symbol);
6530 assemble_constant_contents (decl, XSTR (symbol, 0),
6531 get_constant_alignment (decl));
6532 offset += get_constant_size (decl);
6536 decl = SYMBOL_REF_DECL (symbol);
6537 assemble_variable_contents (decl, XSTR (symbol, 0), false);
6538 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6543 /* A htab_traverse callback used to call output_object_block for
6544 each member of object_block_htab. */
6547 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
6549 output_object_block ((struct object_block *) (*slot));
6553 /* Output the definitions of all object_blocks. */
6556 output_object_blocks (void)
6558 htab_traverse (object_block_htab, output_object_block_htab, NULL);
6561 /* This function provides a possible implementation of the
6562 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
6563 by -frecord-gcc-switches it creates a new mergeable, string section in the
6564 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
6565 contains the switches in ASCII format.
6567 FIXME: This code does not correctly handle double quote characters
6568 that appear inside strings, (it strips them rather than preserving them).
6569 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
6570 characters - instead it treats them as sub-string separators. Since
6571 we want to emit NUL strings terminators into the object file we have to use
6575 elf_record_gcc_switches (print_switch_type type, const char * name)
6577 static char buffer[1024];
6579 /* This variable is used as part of a simplistic heuristic to detect
6580 command line switches which take an argument:
6582 "If a command line option does not start with a dash then
6583 it is an argument for the previous command line option."
6585 This fails in the case of the command line option which is the name
6586 of the file to compile, but otherwise it is pretty reasonable. */
6587 static bool previous_name_held_back = FALSE;
6591 case SWITCH_TYPE_PASSED:
6594 if (previous_name_held_back)
6596 unsigned int len = strlen (buffer);
6598 snprintf (buffer + len, sizeof buffer - len, " %s", name);
6599 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6600 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6601 previous_name_held_back = FALSE;
6605 strncpy (buffer, name, sizeof buffer);
6606 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6607 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6612 if (previous_name_held_back)
6614 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6615 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6618 strncpy (buffer, name, sizeof buffer);
6619 previous_name_held_back = TRUE;
6623 case SWITCH_TYPE_DESCRIPTIVE:
6626 /* Distinguish between invocations where name is NULL. */
6627 static bool started = false;
6631 if (previous_name_held_back)
6633 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6634 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6641 sec = get_section (targetm.asm_out.record_gcc_switches_section,
6645 | (SECTION_ENTSIZE & 1),
6647 switch_to_section (sec);
6656 /* The return value is currently ignored by the caller, but must be 0.
6657 For -fverbose-asm the return value would be the number of characters
6658 emitted into the assembler file. */
6662 /* Emit text to declare externally defined symbols. It is needed to
6663 properly support non-default visibility. */
6665 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED,
6667 const char *name ATTRIBUTE_UNUSED)
6669 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
6670 set in order to avoid putting out names that are never really
6672 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
6673 && targetm.binds_local_p (decl))
6674 maybe_assemble_visibility (decl);
6677 #include "gt-varasm.h"