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 align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1102 #ifdef CONSTANT_ALIGNMENT
1103 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
1104 align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl), align);
1108 /* Reset the alignment in case we have made it tighter, so we can benefit
1109 from it in get_pointer_alignment. */
1110 DECL_ALIGN (decl) = align;
1113 /* Return the section into which the given VAR_DECL or CONST_DECL
1114 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1115 section should be used wherever possible. */
1118 get_variable_section (tree decl, bool prefer_noswitch_p)
1122 /* If the decl has been given an explicit section name, then it
1123 isn't common, and shouldn't be handled as such. */
1124 if (DECL_COMMON (decl) && DECL_SECTION_NAME (decl) == NULL)
1126 if (DECL_THREAD_LOCAL_P (decl))
1127 return tls_comm_section;
1128 if (TREE_PUBLIC (decl) && bss_initializer_p (decl))
1129 return comm_section;
1132 if (DECL_INITIAL (decl) == error_mark_node)
1133 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
1134 else if (DECL_INITIAL (decl))
1135 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
1139 resolve_unique_section (decl, reloc, flag_data_sections);
1140 if (IN_NAMED_SECTION (decl))
1141 return get_named_section (decl, NULL, reloc);
1143 if (!DECL_THREAD_LOCAL_P (decl)
1144 && !(prefer_noswitch_p && targetm.have_switchable_bss_sections)
1145 && bss_initializer_p (decl))
1147 if (!TREE_PUBLIC (decl))
1148 return lcomm_section;
1149 if (bss_noswitch_section)
1150 return bss_noswitch_section;
1153 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
1156 /* Return the block into which object_block DECL should be placed. */
1158 static struct object_block *
1159 get_block_for_decl (tree decl)
1163 if (TREE_CODE (decl) == VAR_DECL)
1165 /* The object must be defined in this translation unit. */
1166 if (DECL_EXTERNAL (decl))
1169 /* There's no point using object blocks for something that is
1170 isolated by definition. */
1171 if (DECL_ONE_ONLY (decl))
1175 /* We can only calculate block offsets if the decl has a known
1177 if (DECL_SIZE_UNIT (decl) == NULL)
1179 if (!host_integerp (DECL_SIZE_UNIT (decl), 1))
1182 /* Find out which section should contain DECL. We cannot put it into
1183 an object block if it requires a standalone definition. */
1184 if (TREE_CODE (decl) == VAR_DECL)
1185 align_variable (decl, 0);
1186 sect = get_variable_section (decl, true);
1187 if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
1190 return get_block_for_section (sect);
1193 /* Make sure block symbol SYMBOL is in block BLOCK. */
1196 change_symbol_block (rtx symbol, struct object_block *block)
1198 if (block != SYMBOL_REF_BLOCK (symbol))
1200 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
1201 SYMBOL_REF_BLOCK (symbol) = block;
1205 /* Return true if it is possible to put DECL in an object_block. */
1208 use_blocks_for_decl_p (tree decl)
1210 /* Only data DECLs can be placed into object blocks. */
1211 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
1214 /* Detect decls created by dw2_force_const_mem. Such decls are
1215 special because DECL_INITIAL doesn't specify the decl's true value.
1216 dw2_output_indirect_constants will instead call assemble_variable
1217 with dont_output_data set to 1 and then print the contents itself. */
1218 if (DECL_INITIAL (decl) == decl)
1221 /* If this decl is an alias, then we don't want to emit a definition. */
1222 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl)))
1228 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1229 have static storage duration. In other words, it should not be an
1230 automatic variable, including PARM_DECLs.
1232 There is, however, one exception: this function handles variables
1233 explicitly placed in a particular register by the user.
1235 This is never called for PARM_DECL nodes. */
1238 make_decl_rtl (tree decl)
1240 const char *name = 0;
1244 /* Check that we are not being given an automatic variable. */
1245 gcc_assert (TREE_CODE (decl) != PARM_DECL
1246 && TREE_CODE (decl) != RESULT_DECL);
1248 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1249 gcc_assert (TREE_CODE (decl) != VAR_DECL
1250 || TREE_STATIC (decl)
1251 || TREE_PUBLIC (decl)
1252 || DECL_EXTERNAL (decl)
1253 || DECL_REGISTER (decl));
1255 /* And that we were not given a type or a label. */
1256 gcc_assert (TREE_CODE (decl) != TYPE_DECL
1257 && TREE_CODE (decl) != LABEL_DECL);
1259 /* For a duplicate declaration, we can be called twice on the
1260 same DECL node. Don't discard the RTL already made. */
1261 if (DECL_RTL_SET_P (decl))
1263 /* If the old RTL had the wrong mode, fix the mode. */
1264 x = DECL_RTL (decl);
1265 if (GET_MODE (x) != DECL_MODE (decl))
1266 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
1268 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1271 /* ??? Another way to do this would be to maintain a hashed
1272 table of such critters. Instead of adding stuff to a DECL
1273 to give certain attributes to it, we could use an external
1274 hash map from DECL to set of attributes. */
1276 /* Let the target reassign the RTL if it wants.
1277 This is necessary, for example, when one machine specific
1278 decl attribute overrides another. */
1279 targetm.encode_section_info (decl, DECL_RTL (decl), false);
1281 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1282 on the new decl information. */
1284 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
1285 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x, 0)))
1286 change_symbol_block (XEXP (x, 0), get_block_for_decl (decl));
1288 /* Make this function static known to the mudflap runtime. */
1289 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1290 mudflap_enqueue_decl (decl);
1295 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1297 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
1298 && DECL_REGISTER (decl))
1300 error ("register name not specified for %q+D", decl);
1302 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1304 const char *asmspec = name+1;
1305 reg_number = decode_reg_name (asmspec);
1306 /* First detect errors in declaring global registers. */
1307 if (reg_number == -1)
1308 error ("register name not specified for %q+D", decl);
1309 else if (reg_number < 0)
1310 error ("invalid register name for %q+D", decl);
1311 else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
1312 error ("data type of %q+D isn%'t suitable for a register",
1314 else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
1315 error ("register specified for %q+D isn%'t suitable for data type",
1317 /* Now handle properly declared static register variables. */
1322 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
1324 DECL_INITIAL (decl) = 0;
1325 error ("global register variable has initial value");
1327 if (TREE_THIS_VOLATILE (decl))
1328 warning (OPT_Wvolatile_register_var,
1329 "optimization may eliminate reads and/or "
1330 "writes to register variables");
1332 /* If the user specified one of the eliminables registers here,
1333 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1334 confused with that register and be eliminated. This usage is
1335 somewhat suspect... */
1337 SET_DECL_RTL (decl, gen_rtx_raw_REG (DECL_MODE (decl), reg_number));
1338 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
1339 REG_USERVAR_P (DECL_RTL (decl)) = 1;
1341 if (TREE_STATIC (decl))
1343 /* Make this register global, so not usable for anything
1345 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1346 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1347 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1349 nregs = hard_regno_nregs[reg_number][DECL_MODE (decl)];
1351 globalize_reg (reg_number + --nregs);
1354 /* As a register variable, it has no section. */
1358 /* Now handle ordinary static variables and functions (in memory).
1359 Also handle vars declared register invalidly. */
1360 else if (name[0] == '*')
1362 #ifdef REGISTER_PREFIX
1363 if (strlen (REGISTER_PREFIX) != 0)
1365 reg_number = decode_reg_name (name);
1366 if (reg_number >= 0 || reg_number == -3)
1367 error ("register name given for non-register variable %q+D", decl);
1372 /* Specifying a section attribute on a variable forces it into a
1373 non-.bss section, and thus it cannot be common. */
1374 if (TREE_CODE (decl) == VAR_DECL
1375 && DECL_SECTION_NAME (decl) != NULL_TREE
1376 && DECL_INITIAL (decl) == NULL_TREE
1377 && DECL_COMMON (decl))
1378 DECL_COMMON (decl) = 0;
1380 /* Variables can't be both common and weak. */
1381 if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl))
1382 DECL_COMMON (decl) = 0;
1384 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1385 x = create_block_symbol (name, get_block_for_decl (decl), -1);
1387 x = gen_rtx_SYMBOL_REF (Pmode, name);
1388 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1389 SET_SYMBOL_REF_DECL (x, decl);
1391 x = gen_rtx_MEM (DECL_MODE (decl), x);
1392 if (TREE_CODE (decl) != FUNCTION_DECL)
1393 set_mem_attributes (x, decl, 1);
1394 SET_DECL_RTL (decl, x);
1396 /* Optionally set flags or add text to the name to record information
1397 such as that it is a function name.
1398 If the name is changed, the macro ASM_OUTPUT_LABELREF
1399 will have to know how to strip this information. */
1400 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1402 /* Make this function static known to the mudflap runtime. */
1403 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1404 mudflap_enqueue_decl (decl);
1407 /* Output a string of literal assembler code
1408 for an `asm' keyword used between functions. */
1411 assemble_asm (tree string)
1415 if (TREE_CODE (string) == ADDR_EXPR)
1416 string = TREE_OPERAND (string, 0);
1418 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
1421 /* Record an element in the table of global destructors. SYMBOL is
1422 a SYMBOL_REF of the function to be called; PRIORITY is a number
1423 between 0 and MAX_INIT_PRIORITY. */
1426 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED,
1427 int priority ATTRIBUTE_UNUSED)
1429 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1430 /* Tell GNU LD that this is part of the static destructor set.
1431 This will work for any system that uses stabs, most usefully
1433 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1434 dbxout_stab_value_label (XSTR (symbol, 0));
1436 sorry ("global destructors not supported on this target");
1440 /* Write the address of the entity given by SYMBOL to SEC. */
1442 assemble_addr_to_section (rtx symbol, section *sec)
1444 switch_to_section (sec);
1445 assemble_align (POINTER_SIZE);
1446 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1449 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1450 not) section for PRIORITY. */
1452 get_cdtor_priority_section (int priority, bool constructor_p)
1456 /* ??? This only works reliably with the GNU linker. */
1457 sprintf (buf, "%s.%.5u",
1458 constructor_p ? ".ctors" : ".dtors",
1459 /* Invert the numbering so the linker puts us in the proper
1460 order; constructors are run from right to left, and the
1461 linker sorts in increasing order. */
1462 MAX_INIT_PRIORITY - priority);
1463 return get_section (buf, SECTION_WRITE, NULL);
1467 default_named_section_asm_out_destructor (rtx symbol, int priority)
1471 if (priority != DEFAULT_INIT_PRIORITY)
1472 sec = get_cdtor_priority_section (priority,
1473 /*constructor_p=*/false);
1475 sec = get_section (".dtors", SECTION_WRITE, NULL);
1477 assemble_addr_to_section (symbol, sec);
1480 #ifdef DTORS_SECTION_ASM_OP
1482 default_dtor_section_asm_out_destructor (rtx symbol,
1483 int priority ATTRIBUTE_UNUSED)
1485 assemble_addr_to_section (symbol, dtors_section);
1489 /* Likewise for global constructors. */
1492 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED,
1493 int priority ATTRIBUTE_UNUSED)
1495 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1496 /* Tell GNU LD that this is part of the static destructor set.
1497 This will work for any system that uses stabs, most usefully
1499 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1500 dbxout_stab_value_label (XSTR (symbol, 0));
1502 sorry ("global constructors not supported on this target");
1507 default_named_section_asm_out_constructor (rtx symbol, int priority)
1511 if (priority != DEFAULT_INIT_PRIORITY)
1512 sec = get_cdtor_priority_section (priority,
1513 /*constructor_p=*/true);
1515 sec = get_section (".ctors", SECTION_WRITE, NULL);
1517 assemble_addr_to_section (symbol, sec);
1520 #ifdef CTORS_SECTION_ASM_OP
1522 default_ctor_section_asm_out_constructor (rtx symbol,
1523 int priority ATTRIBUTE_UNUSED)
1525 assemble_addr_to_section (symbol, ctors_section);
1529 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1530 a nonzero value if the constant pool should be output before the
1531 start of the function, or a zero value if the pool should output
1532 after the end of the function. The default is to put it before the
1535 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1536 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1539 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1540 to be output to assembler.
1541 Set first_global_object_name and weak_global_object_name as appropriate. */
1544 notice_global_symbol (tree decl)
1546 const char **type = &first_global_object_name;
1548 if (first_global_object_name
1549 || !TREE_PUBLIC (decl)
1550 || DECL_EXTERNAL (decl)
1551 || !DECL_NAME (decl)
1552 || (TREE_CODE (decl) != FUNCTION_DECL
1553 && (TREE_CODE (decl) != VAR_DECL
1554 || (DECL_COMMON (decl)
1555 && (DECL_INITIAL (decl) == 0
1556 || DECL_INITIAL (decl) == error_mark_node))))
1557 || !MEM_P (DECL_RTL (decl)))
1560 /* We win when global object is found, but it is useful to know about weak
1561 symbol as well so we can produce nicer unique names. */
1562 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl) || flag_shlib)
1563 type = &weak_global_object_name;
1569 rtx decl_rtl = DECL_RTL (decl);
1571 p = targetm.strip_name_encoding (XSTR (XEXP (decl_rtl, 0), 0));
1572 name = ggc_strdup (p);
1578 /* Output assembler code for the constant pool of a function and associated
1579 with defining the name of the function. DECL describes the function.
1580 NAME is the function's name. For the constant pool, we use the current
1581 constant pool data. */
1584 assemble_start_function (tree decl, const char *fnname)
1587 char tmp_label[100];
1588 bool hot_label_written = false;
1590 cfun->unlikely_text_section_name = NULL;
1592 first_function_block_is_cold = false;
1593 if (flag_reorder_blocks_and_partition)
1595 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1596 cfun->hot_section_label = ggc_strdup (tmp_label);
1597 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1598 cfun->cold_section_label = ggc_strdup (tmp_label);
1599 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1600 cfun->hot_section_end_label = ggc_strdup (tmp_label);
1601 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1602 cfun->cold_section_end_label = ggc_strdup (tmp_label);
1607 cfun->hot_section_label = NULL;
1608 cfun->cold_section_label = NULL;
1609 cfun->hot_section_end_label = NULL;
1610 cfun->cold_section_end_label = NULL;
1613 /* The following code does not need preprocessing in the assembler. */
1617 if (CONSTANT_POOL_BEFORE_FUNCTION)
1618 output_constant_pool (fnname, decl);
1620 resolve_unique_section (decl, 0, flag_function_sections);
1622 /* Make sure the not and cold text (code) sections are properly
1623 aligned. This is necessary here in the case where the function
1624 has both hot and cold sections, because we don't want to re-set
1625 the alignment when the section switch happens mid-function. */
1627 if (flag_reorder_blocks_and_partition)
1629 switch_to_section (unlikely_text_section ());
1630 assemble_align (FUNCTION_BOUNDARY);
1631 ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_label);
1633 /* When the function starts with a cold section, we need to explicitly
1634 align the hot section and write out the hot section label.
1635 But if the current function is a thunk, we do not have a CFG. */
1636 if (!current_function_is_thunk
1637 && BB_PARTITION (ENTRY_BLOCK_PTR->next_bb) == BB_COLD_PARTITION)
1639 switch_to_section (text_section);
1640 assemble_align (FUNCTION_BOUNDARY);
1641 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_label);
1642 hot_label_written = true;
1643 first_function_block_is_cold = true;
1646 else if (DECL_SECTION_NAME (decl))
1648 /* Calls to function_section rely on first_function_block_is_cold
1649 being accurate. The first block may be cold even if we aren't
1650 doing partitioning, if the entire function was decided by
1651 choose_function_section (predict.c) to be cold. */
1653 initialize_cold_section_name ();
1655 if (cfun->unlikely_text_section_name
1656 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)),
1657 cfun->unlikely_text_section_name) == 0)
1658 first_function_block_is_cold = true;
1661 in_cold_section_p = first_function_block_is_cold;
1663 /* Switch to the correct text section for the start of the function. */
1665 switch_to_section (function_section (decl));
1666 if (flag_reorder_blocks_and_partition
1667 && !hot_label_written)
1668 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_label);
1670 /* Tell assembler to move to target machine's alignment for functions. */
1671 align = floor_log2 (FUNCTION_BOUNDARY / BITS_PER_UNIT);
1672 if (align < force_align_functions_log)
1673 align = force_align_functions_log;
1676 ASM_OUTPUT_ALIGN (asm_out_file, align);
1679 /* Handle a user-specified function alignment.
1680 Note that we still need to align to FUNCTION_BOUNDARY, as above,
1681 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1682 if (align_functions_log > align
1683 && cfun->function_frequency != FUNCTION_FREQUENCY_UNLIKELY_EXECUTED)
1685 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1686 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1687 align_functions_log, align_functions - 1);
1689 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1693 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1694 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1697 (*debug_hooks->begin_function) (decl);
1699 /* Make function name accessible from other files, if appropriate. */
1701 if (TREE_PUBLIC (decl))
1703 notice_global_symbol (decl);
1705 globalize_decl (decl);
1707 maybe_assemble_visibility (decl);
1710 if (DECL_PRESERVE_P (decl))
1711 targetm.asm_out.mark_decl_preserved (fnname);
1713 /* Do any machine/system dependent processing of the function name. */
1714 #ifdef ASM_DECLARE_FUNCTION_NAME
1715 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1717 /* Standard thing is just output label for the function. */
1718 ASM_OUTPUT_LABEL (asm_out_file, fnname);
1719 #endif /* ASM_DECLARE_FUNCTION_NAME */
1722 /* Output assembler code associated with defining the size of the
1723 function. DECL describes the function. NAME is the function's name. */
1726 assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
1728 #ifdef ASM_DECLARE_FUNCTION_SIZE
1729 /* We could have switched section in the middle of the function. */
1730 if (flag_reorder_blocks_and_partition)
1731 switch_to_section (function_section (decl));
1732 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1734 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1736 output_constant_pool (fnname, decl);
1737 switch_to_section (function_section (decl)); /* need to switch back */
1739 /* Output labels for end of hot/cold text sections (to be used by
1741 if (flag_reorder_blocks_and_partition)
1743 section *save_text_section;
1745 save_text_section = in_section;
1746 switch_to_section (unlikely_text_section ());
1747 ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_end_label);
1748 if (first_function_block_is_cold)
1749 switch_to_section (text_section);
1751 switch_to_section (function_section (decl));
1752 ASM_OUTPUT_LABEL (asm_out_file, cfun->hot_section_end_label);
1753 switch_to_section (save_text_section);
1757 /* Assemble code to leave SIZE bytes of zeros. */
1760 assemble_zeros (unsigned HOST_WIDE_INT size)
1762 /* Do no output if -fsyntax-only. */
1763 if (flag_syntax_only)
1766 #ifdef ASM_NO_SKIP_IN_TEXT
1767 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1768 so we must output 0s explicitly in the text section. */
1769 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1771 unsigned HOST_WIDE_INT i;
1772 for (i = 0; i < size; i++)
1773 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1778 ASM_OUTPUT_SKIP (asm_out_file, size);
1781 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1784 assemble_align (int align)
1786 if (align > BITS_PER_UNIT)
1788 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1792 /* Assemble a string constant with the specified C string as contents. */
1795 assemble_string (const char *p, int size)
1800 /* If the string is very long, split it up. */
1804 int thissize = size - pos;
1805 if (thissize > maximum)
1808 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1816 /* A noswitch_section_callback for lcomm_section. */
1819 emit_local (tree decl ATTRIBUTE_UNUSED,
1820 const char *name ATTRIBUTE_UNUSED,
1821 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1822 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1824 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1825 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name,
1826 size, DECL_ALIGN (decl));
1828 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1829 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl));
1832 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1837 /* A noswitch_section_callback for bss_noswitch_section. */
1839 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1841 emit_bss (tree decl ATTRIBUTE_UNUSED,
1842 const char *name ATTRIBUTE_UNUSED,
1843 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1844 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1846 #if defined ASM_OUTPUT_ALIGNED_BSS
1847 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl));
1850 ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded);
1856 /* A noswitch_section_callback for comm_section. */
1859 emit_common (tree decl ATTRIBUTE_UNUSED,
1860 const char *name ATTRIBUTE_UNUSED,
1861 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1862 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1864 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1865 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name,
1866 size, DECL_ALIGN (decl));
1868 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1869 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl));
1872 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1877 /* A noswitch_section_callback for tls_comm_section. */
1880 emit_tls_common (tree decl ATTRIBUTE_UNUSED,
1881 const char *name ATTRIBUTE_UNUSED,
1882 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1883 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1885 #ifdef ASM_OUTPUT_TLS_COMMON
1886 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1889 sorry ("thread-local COMMON data not implemented");
1894 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1895 NAME is the name of DECL's SYMBOL_REF. */
1898 assemble_noswitch_variable (tree decl, const char *name, section *sect)
1900 unsigned HOST_WIDE_INT size, rounded;
1902 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1905 /* Don't allocate zero bytes of common,
1906 since that means "undefined external" in the linker. */
1910 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1911 so that each uninitialized object starts on such a boundary. */
1912 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
1913 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1914 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1916 if (!sect->noswitch.callback (decl, name, size, rounded)
1917 && (unsigned HOST_WIDE_INT) DECL_ALIGN_UNIT (decl) > rounded)
1918 warning (0, "requested alignment for %q+D is greater than "
1919 "implemented alignment of %wu", decl, rounded);
1922 /* A subroutine of assemble_variable. Output the label and contents of
1923 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1924 is as for assemble_variable. */
1927 assemble_variable_contents (tree decl, const char *name,
1928 bool dont_output_data)
1930 /* Do any machine/system dependent processing of the object. */
1931 #ifdef ASM_DECLARE_OBJECT_NAME
1932 last_assemble_variable_decl = decl;
1933 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
1935 /* Standard thing is just output label for the object. */
1936 ASM_OUTPUT_LABEL (asm_out_file, name);
1937 #endif /* ASM_DECLARE_OBJECT_NAME */
1939 if (!dont_output_data)
1941 if (DECL_INITIAL (decl)
1942 && DECL_INITIAL (decl) != error_mark_node
1943 && !initializer_zerop (DECL_INITIAL (decl)))
1944 /* Output the actual data. */
1945 output_constant (DECL_INITIAL (decl),
1946 tree_low_cst (DECL_SIZE_UNIT (decl), 1),
1949 /* Leave space for it. */
1950 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
1954 /* Assemble everything that is needed for a variable or function declaration.
1955 Not used for automatic variables, and not used for function definitions.
1956 Should not be called for variables of incomplete structure type.
1958 TOP_LEVEL is nonzero if this variable has file scope.
1959 AT_END is nonzero if this is the special handling, at end of compilation,
1960 to define things that have had only tentative definitions.
1961 DONT_OUTPUT_DATA if nonzero means don't actually output the
1962 initial value (that will be done by the caller). */
1965 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
1966 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
1969 rtx decl_rtl, symbol;
1972 if (! targetm.have_tls
1973 && TREE_CODE (decl) == VAR_DECL
1974 && DECL_THREAD_LOCAL_P (decl))
1976 tree to = emutls_decl (decl);
1978 /* If this variable is defined locally, then we need to initialize the
1979 control structure with size and alignment information. We do this
1980 at the last moment because tentative definitions can take a locally
1981 defined but uninitialized variable and initialize it later, which
1982 would result in incorrect contents. */
1983 if (! DECL_EXTERNAL (to)
1984 && (! DECL_COMMON (to)
1985 || (DECL_INITIAL (decl)
1986 && DECL_INITIAL (decl) != error_mark_node)))
1988 VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 4);
1989 constructor_elt *elt;
1990 tree type = TREE_TYPE (to);
1991 tree field = TYPE_FIELDS (type);
1993 elt = VEC_quick_push (constructor_elt, v, NULL);
1995 elt->value = fold_convert (TREE_TYPE (field), DECL_SIZE_UNIT (decl));
1997 elt = VEC_quick_push (constructor_elt, v, NULL);
1998 field = TREE_CHAIN (field);
2000 elt->value = build_int_cst (TREE_TYPE (field),
2001 DECL_ALIGN_UNIT (decl));
2003 elt = VEC_quick_push (constructor_elt, v, NULL);
2004 field = TREE_CHAIN (field);
2006 elt->value = null_pointer_node;
2008 elt = VEC_quick_push (constructor_elt, v, NULL);
2009 field = TREE_CHAIN (field);
2011 elt->value = get_emutls_init_templ_addr (decl);
2013 DECL_INITIAL (to) = build_constructor (type, v);
2015 /* Make sure the template is marked as needed early enough.
2016 Without this, if the variable is placed in a
2017 section-anchored block, the template will only be marked
2018 when it's too late. */
2019 record_references_in_initializer (to);
2025 if (lang_hooks.decls.prepare_assemble_variable)
2026 lang_hooks.decls.prepare_assemble_variable (decl);
2028 last_assemble_variable_decl = 0;
2030 /* Normally no need to say anything here for external references,
2031 since assemble_external is called by the language-specific code
2032 when a declaration is first seen. */
2034 if (DECL_EXTERNAL (decl))
2037 /* Output no assembler code for a function declaration.
2038 Only definitions of functions output anything. */
2040 if (TREE_CODE (decl) == FUNCTION_DECL)
2043 /* Do nothing for global register variables. */
2044 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
2046 TREE_ASM_WRITTEN (decl) = 1;
2050 /* If type was incomplete when the variable was declared,
2051 see if it is complete now. */
2053 if (DECL_SIZE (decl) == 0)
2054 layout_decl (decl, 0);
2056 /* Still incomplete => don't allocate it; treat the tentative defn
2057 (which is what it must have been) as an `extern' reference. */
2059 if (!dont_output_data && DECL_SIZE (decl) == 0)
2061 error ("storage size of %q+D isn%'t known", decl);
2062 TREE_ASM_WRITTEN (decl) = 1;
2066 /* The first declaration of a variable that comes through this function
2067 decides whether it is global (in C, has external linkage)
2068 or local (in C, has internal linkage). So do nothing more
2069 if this function has already run. */
2071 if (TREE_ASM_WRITTEN (decl))
2074 /* Make sure targetm.encode_section_info is invoked before we set
2076 decl_rtl = DECL_RTL (decl);
2078 TREE_ASM_WRITTEN (decl) = 1;
2080 /* Do no output if -fsyntax-only. */
2081 if (flag_syntax_only)
2086 if (! dont_output_data
2087 && ! host_integerp (DECL_SIZE_UNIT (decl), 1))
2089 error ("size of variable %q+D is too large", decl);
2093 gcc_assert (MEM_P (decl_rtl));
2094 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
2095 symbol = XEXP (decl_rtl, 0);
2096 name = XSTR (symbol, 0);
2097 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
2098 notice_global_symbol (decl);
2100 /* Compute the alignment of this data. */
2102 align_variable (decl, dont_output_data);
2103 set_mem_align (decl_rtl, DECL_ALIGN (decl));
2105 if (TREE_PUBLIC (decl))
2106 maybe_assemble_visibility (decl);
2108 if (DECL_PRESERVE_P (decl))
2109 targetm.asm_out.mark_decl_preserved (name);
2111 /* First make the assembler name(s) global if appropriate. */
2112 sect = get_variable_section (decl, false);
2113 if (TREE_PUBLIC (decl)
2115 && (sect->common.flags & SECTION_COMMON) == 0)
2116 globalize_decl (decl);
2118 /* Output any data that we will need to use the address of. */
2119 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
2120 output_addressed_constants (DECL_INITIAL (decl));
2122 /* dbxout.c needs to know this. */
2123 if (sect && (sect->common.flags & SECTION_CODE) != 0)
2124 DECL_IN_TEXT_SECTION (decl) = 1;
2126 /* If the decl is part of an object_block, make sure that the decl
2127 has been positioned within its block, but do not write out its
2128 definition yet. output_object_blocks will do that later. */
2129 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
2131 gcc_assert (!dont_output_data);
2132 place_block_symbol (symbol);
2134 else if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
2135 assemble_noswitch_variable (decl, name, sect);
2138 switch_to_section (sect);
2139 if (DECL_ALIGN (decl) > BITS_PER_UNIT)
2140 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (DECL_ALIGN_UNIT (decl)));
2141 assemble_variable_contents (decl, name, dont_output_data);
2145 /* Return 1 if type TYPE contains any pointers. */
2148 contains_pointers_p (tree type)
2150 switch (TREE_CODE (type))
2153 case REFERENCE_TYPE:
2154 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2155 so I'll play safe and return 1. */
2161 case QUAL_UNION_TYPE:
2164 /* For a type that has fields, see if the fields have pointers. */
2165 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
2166 if (TREE_CODE (fields) == FIELD_DECL
2167 && contains_pointers_p (TREE_TYPE (fields)))
2173 /* An array type contains pointers if its element type does. */
2174 return contains_pointers_p (TREE_TYPE (type));
2181 /* In unit-at-a-time mode, we delay assemble_external processing until
2182 the compilation unit is finalized. This is the best we can do for
2183 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2184 it all the way to final. See PR 17982 for further discussion. */
2185 static GTY(()) tree pending_assemble_externals;
2187 #ifdef ASM_OUTPUT_EXTERNAL
2188 /* True if DECL is a function decl for which no out-of-line copy exists.
2189 It is assumed that DECL's assembler name has been set. */
2192 incorporeal_function_p (tree decl)
2194 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
2198 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
2199 && DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA)
2202 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
2203 if (strncmp (name, "__builtin_", strlen ("__builtin_")) == 0)
2209 /* Actually do the tests to determine if this is necessary, and invoke
2210 ASM_OUTPUT_EXTERNAL. */
2212 assemble_external_real (tree decl)
2214 rtx rtl = DECL_RTL (decl);
2216 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
2217 && !SYMBOL_REF_USED (XEXP (rtl, 0))
2218 && !incorporeal_function_p (decl))
2220 /* Some systems do require some output. */
2221 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
2222 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
2228 process_pending_assemble_externals (void)
2230 #ifdef ASM_OUTPUT_EXTERNAL
2232 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
2233 assemble_external_real (TREE_VALUE (list));
2235 pending_assemble_externals = 0;
2239 /* Output something to declare an external symbol to the assembler.
2240 (Most assemblers don't need this, so we normally output nothing.)
2241 Do nothing if DECL is not external. */
2244 assemble_external (tree decl ATTRIBUTE_UNUSED)
2246 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2247 main body of this code is only rarely exercised. To provide some
2248 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2249 open. If it's not, we should not be calling this function. */
2250 gcc_assert (asm_out_file);
2252 #ifdef ASM_OUTPUT_EXTERNAL
2253 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
2256 /* We want to output external symbols at very last to check if they
2257 are references or not. */
2258 pending_assemble_externals = tree_cons (0, decl,
2259 pending_assemble_externals);
2263 /* Similar, for calling a library function FUN. */
2266 assemble_external_libcall (rtx fun)
2268 /* Declare library function name external when first used, if nec. */
2269 if (! SYMBOL_REF_USED (fun))
2271 SYMBOL_REF_USED (fun) = 1;
2272 targetm.asm_out.external_libcall (fun);
2276 /* Assemble a label named NAME. */
2279 assemble_label (const char *name)
2281 ASM_OUTPUT_LABEL (asm_out_file, name);
2284 /* Set the symbol_referenced flag for ID. */
2286 mark_referenced (tree id)
2288 TREE_SYMBOL_REFERENCED (id) = 1;
2291 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2293 mark_decl_referenced (tree decl)
2295 if (TREE_CODE (decl) == FUNCTION_DECL)
2297 /* Extern inline functions don't become needed when referenced.
2298 If we know a method will be emitted in other TU and no new
2299 functions can be marked reachable, just use the external
2301 struct cgraph_node *node = cgraph_node (decl);
2302 if (!DECL_EXTERNAL (decl)
2303 && (!node->local.vtable_method || !cgraph_global_info_ready
2304 || !node->local.finalized))
2305 cgraph_mark_needed_node (node);
2307 else if (TREE_CODE (decl) == VAR_DECL)
2309 struct varpool_node *node = varpool_node (decl);
2310 varpool_mark_needed_node (node);
2311 /* C++ frontend use mark_decl_references to force COMDAT variables
2312 to be output that might appear dead otherwise. */
2313 node->force_output = true;
2315 /* else do nothing - we can get various sorts of CST nodes here,
2316 which do not need to be marked. */
2320 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2321 until we find an identifier that is not itself a transparent alias.
2322 Modify the alias passed to it by reference (and all aliases on the
2323 way to the ultimate target), such that they do not have to be
2324 followed again, and return the ultimate target of the alias
2328 ultimate_transparent_alias_target (tree *alias)
2330 tree target = *alias;
2332 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
2334 gcc_assert (TREE_CHAIN (target));
2335 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
2336 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
2337 && ! TREE_CHAIN (target));
2344 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2345 starts with a *, the rest of NAME is output verbatim. Otherwise
2346 NAME is transformed in a target-specific way (usually by the
2347 addition of an underscore). */
2350 assemble_name_raw (FILE *file, const char *name)
2353 fputs (&name[1], file);
2355 ASM_OUTPUT_LABELREF (file, name);
2358 /* Like assemble_name_raw, but should be used when NAME might refer to
2359 an entity that is also represented as a tree (like a function or
2360 variable). If NAME does refer to such an entity, that entity will
2361 be marked as referenced. */
2364 assemble_name (FILE *file, const char *name)
2366 const char *real_name;
2369 real_name = targetm.strip_name_encoding (name);
2371 id = maybe_get_identifier (real_name);
2376 mark_referenced (id);
2377 ultimate_transparent_alias_target (&id);
2379 name = IDENTIFIER_POINTER (id);
2380 gcc_assert (! TREE_CHAIN (id));
2383 assemble_name_raw (file, name);
2386 /* Allocate SIZE bytes writable static space with a gensym name
2387 and return an RTX to refer to its address. */
2390 assemble_static_space (unsigned HOST_WIDE_INT size)
2393 const char *namestring;
2396 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2398 namestring = ggc_strdup (name);
2400 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2401 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2403 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2404 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2407 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2408 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2411 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2412 so that each uninitialized object starts on such a boundary. */
2413 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2414 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2415 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2416 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2417 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2418 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2425 /* Assemble the static constant template for function entry trampolines.
2426 This is done at most once per compilation.
2427 Returns an RTX for the address of the template. */
2429 static GTY(()) rtx initial_trampoline;
2431 #ifdef TRAMPOLINE_TEMPLATE
2433 assemble_trampoline_template (void)
2440 if (initial_trampoline)
2441 return initial_trampoline;
2443 /* By default, put trampoline templates in read-only data section. */
2445 #ifdef TRAMPOLINE_SECTION
2446 switch_to_section (TRAMPOLINE_SECTION);
2448 switch_to_section (readonly_data_section);
2451 /* Write the assembler code to define one. */
2452 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2455 ASM_OUTPUT_ALIGN (asm_out_file, align);
2458 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2459 TRAMPOLINE_TEMPLATE (asm_out_file);
2461 /* Record the rtl to refer to it. */
2462 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2463 name = ggc_strdup (label);
2464 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2465 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2467 initial_trampoline = gen_rtx_MEM (BLKmode, symbol);
2468 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2470 return initial_trampoline;
2474 /* A and B are either alignments or offsets. Return the minimum alignment
2475 that may be assumed after adding the two together. */
2477 static inline unsigned
2478 min_align (unsigned int a, unsigned int b)
2480 return (a | b) & -(a | b);
2483 /* Return the assembler directive for creating a given kind of integer
2484 object. SIZE is the number of bytes in the object and ALIGNED_P
2485 indicates whether it is known to be aligned. Return NULL if the
2486 assembly dialect has no such directive.
2488 The returned string should be printed at the start of a new line and
2489 be followed immediately by the object's initial value. */
2492 integer_asm_op (int size, int aligned_p)
2494 struct asm_int_op *ops;
2497 ops = &targetm.asm_out.aligned_op;
2499 ops = &targetm.asm_out.unaligned_op;
2504 return targetm.asm_out.byte_op;
2518 /* Use directive OP to assemble an integer object X. Print OP at the
2519 start of the line, followed immediately by the value of X. */
2522 assemble_integer_with_op (const char *op, rtx x)
2524 fputs (op, asm_out_file);
2525 output_addr_const (asm_out_file, x);
2526 fputc ('\n', asm_out_file);
2529 /* The default implementation of the asm_out.integer target hook. */
2532 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2533 unsigned int size ATTRIBUTE_UNUSED,
2534 int aligned_p ATTRIBUTE_UNUSED)
2536 const char *op = integer_asm_op (size, aligned_p);
2537 /* Avoid GAS bugs for large values. Specifically negative values whose
2538 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2539 if (size > UNITS_PER_WORD && size > POINTER_SIZE / BITS_PER_UNIT)
2541 return op && (assemble_integer_with_op (op, x), true);
2544 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2545 the alignment of the integer in bits. Return 1 if we were able to output
2546 the constant, otherwise 0. We must be able to output the constant,
2547 if FORCE is nonzero. */
2550 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2554 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2556 /* See if the target hook can handle this kind of object. */
2557 if (targetm.asm_out.integer (x, size, aligned_p))
2560 /* If the object is a multi-byte one, try splitting it up. Split
2561 it into words it if is multi-word, otherwise split it into bytes. */
2564 enum machine_mode omode, imode;
2565 unsigned int subalign;
2566 unsigned int subsize, i;
2568 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2569 subalign = MIN (align, subsize * BITS_PER_UNIT);
2570 omode = mode_for_size (subsize * BITS_PER_UNIT, MODE_INT, 0);
2571 imode = mode_for_size (size * BITS_PER_UNIT, MODE_INT, 0);
2573 for (i = 0; i < size; i += subsize)
2575 rtx partial = simplify_subreg (omode, x, imode, i);
2576 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2582 /* If we've printed some of it, but not all of it, there's no going
2587 gcc_assert (!force);
2593 assemble_real (REAL_VALUE_TYPE d, enum machine_mode mode, unsigned int align)
2595 long data[4] = {0, 0, 0, 0};
2597 int bitsize, nelts, nunits, units_per;
2599 /* This is hairy. We have a quantity of known size. real_to_target
2600 will put it into an array of *host* longs, 32 bits per element
2601 (even if long is more than 32 bits). We need to determine the
2602 number of array elements that are occupied (nelts) and the number
2603 of *target* min-addressable units that will be occupied in the
2604 object file (nunits). We cannot assume that 32 divides the
2605 mode's bitsize (size * BITS_PER_UNIT) evenly.
2607 size * BITS_PER_UNIT is used here to make sure that padding bits
2608 (which might appear at either end of the value; real_to_target
2609 will include the padding bits in its output array) are included. */
2611 nunits = GET_MODE_SIZE (mode);
2612 bitsize = nunits * BITS_PER_UNIT;
2613 nelts = CEIL (bitsize, 32);
2614 units_per = 32 / BITS_PER_UNIT;
2616 real_to_target (data, &d, mode);
2618 /* Put out the first word with the specified alignment. */
2619 assemble_integer (GEN_INT (data[0]), MIN (nunits, units_per), align, 1);
2620 nunits -= units_per;
2622 /* Subsequent words need only 32-bit alignment. */
2623 align = min_align (align, 32);
2625 for (i = 1; i < nelts; i++)
2627 assemble_integer (GEN_INT (data[i]), MIN (nunits, units_per), align, 1);
2628 nunits -= units_per;
2632 /* Given an expression EXP with a constant value,
2633 reduce it to the sum of an assembler symbol and an integer.
2634 Store them both in the structure *VALUE.
2635 EXP must be reducible. */
2637 struct addr_const GTY(())
2640 HOST_WIDE_INT offset;
2644 decode_addr_const (tree exp, struct addr_const *value)
2646 tree target = TREE_OPERAND (exp, 0);
2652 if (TREE_CODE (target) == COMPONENT_REF
2653 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2656 offset += int_byte_position (TREE_OPERAND (target, 1));
2657 target = TREE_OPERAND (target, 0);
2659 else if (TREE_CODE (target) == ARRAY_REF
2660 || TREE_CODE (target) == ARRAY_RANGE_REF)
2662 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2663 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2664 target = TREE_OPERAND (target, 0);
2670 switch (TREE_CODE (target))
2674 x = DECL_RTL (target);
2678 x = gen_rtx_MEM (FUNCTION_MODE,
2679 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2687 x = output_constant_def (target, 1);
2694 gcc_assert (MEM_P (x));
2698 value->offset = offset;
2701 /* Uniquize all constants that appear in memory.
2702 Each constant in memory thus far output is recorded
2703 in `const_desc_table'. */
2705 struct constant_descriptor_tree GTY(())
2707 /* A MEM for the constant. */
2710 /* The value of the constant. */
2713 /* Hash of value. Computing the hash from value each time
2714 hashfn is called can't work properly, as that means recursive
2715 use of the hash table during hash table expansion. */
2719 static GTY((param_is (struct constant_descriptor_tree)))
2720 htab_t const_desc_htab;
2722 static struct constant_descriptor_tree * build_constant_desc (tree);
2723 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2725 /* Compute a hash code for a constant expression. */
2728 const_desc_hash (const void *ptr)
2730 return ((struct constant_descriptor_tree *)ptr)->hash;
2734 const_hash_1 (const tree exp)
2739 enum tree_code code = TREE_CODE (exp);
2741 /* Either set P and LEN to the address and len of something to hash and
2742 exit the switch or return a value. */
2747 p = (char *) &TREE_INT_CST (exp);
2748 len = sizeof TREE_INT_CST (exp);
2752 return real_hash (TREE_REAL_CST_PTR (exp));
2755 p = TREE_STRING_POINTER (exp);
2756 len = TREE_STRING_LENGTH (exp);
2760 return (const_hash_1 (TREE_REALPART (exp)) * 5
2761 + const_hash_1 (TREE_IMAGPART (exp)));
2765 unsigned HOST_WIDE_INT idx;
2768 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2770 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2772 hi = hi * 603 + const_hash_1 (value);
2780 struct addr_const value;
2782 decode_addr_const (exp, &value);
2783 switch (GET_CODE (value.base))
2786 /* Don't hash the address of the SYMBOL_REF;
2787 only use the offset and the symbol name. */
2789 p = XSTR (value.base, 0);
2790 for (i = 0; p[i] != 0; i++)
2791 hi = ((hi * 613) + (unsigned) (p[i]));
2795 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2806 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2807 + const_hash_1 (TREE_OPERAND (exp, 1)));
2811 case NON_LVALUE_EXPR:
2812 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2815 /* A language specific constant. Just hash the code. */
2819 /* Compute hashing function. */
2821 for (i = 0; i < len; i++)
2822 hi = ((hi * 613) + (unsigned) (p[i]));
2827 /* Wrapper of compare_constant, for the htab interface. */
2829 const_desc_eq (const void *p1, const void *p2)
2831 const struct constant_descriptor_tree *c1 = p1;
2832 const struct constant_descriptor_tree *c2 = p2;
2833 if (c1->hash != c2->hash)
2835 return compare_constant (c1->value, c2->value);
2838 /* Compare t1 and t2, and return 1 only if they are known to result in
2839 the same bit pattern on output. */
2842 compare_constant (const tree t1, const tree t2)
2844 enum tree_code typecode;
2846 if (t1 == NULL_TREE)
2847 return t2 == NULL_TREE;
2848 if (t2 == NULL_TREE)
2851 if (TREE_CODE (t1) != TREE_CODE (t2))
2854 switch (TREE_CODE (t1))
2857 /* Integer constants are the same only if the same width of type. */
2858 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2860 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2862 return tree_int_cst_equal (t1, t2);
2865 /* Real constants are the same only if the same width of type. */
2866 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2869 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2872 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2875 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2876 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2877 TREE_STRING_LENGTH (t1)));
2880 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2881 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2885 VEC(constructor_elt, gc) *v1, *v2;
2886 unsigned HOST_WIDE_INT idx;
2888 typecode = TREE_CODE (TREE_TYPE (t1));
2889 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2892 if (typecode == ARRAY_TYPE)
2894 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
2895 /* For arrays, check that the sizes all match. */
2896 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
2898 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
2903 /* For record and union constructors, require exact type
2905 if (TREE_TYPE (t1) != TREE_TYPE (t2))
2909 v1 = CONSTRUCTOR_ELTS (t1);
2910 v2 = CONSTRUCTOR_ELTS (t2);
2911 if (VEC_length (constructor_elt, v1)
2912 != VEC_length (constructor_elt, v2))
2915 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
2917 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
2918 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
2920 /* Check that each value is the same... */
2921 if (!compare_constant (c1->value, c2->value))
2923 /* ... and that they apply to the same fields! */
2924 if (typecode == ARRAY_TYPE)
2926 if (!compare_constant (c1->index, c2->index))
2931 if (c1->index != c2->index)
2942 struct addr_const value1, value2;
2944 decode_addr_const (t1, &value1);
2945 decode_addr_const (t2, &value2);
2946 return (value1.offset == value2.offset
2947 && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
2953 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
2954 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
2958 case NON_LVALUE_EXPR:
2959 case VIEW_CONVERT_EXPR:
2960 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
2965 nt1 = lang_hooks.expand_constant (t1);
2966 nt2 = lang_hooks.expand_constant (t2);
2967 if (nt1 != t1 || nt2 != t2)
2968 return compare_constant (nt1, nt2);
2977 /* Make a copy of the whole tree structure for a constant. This
2978 handles the same types of nodes that compare_constant handles. */
2981 copy_constant (tree exp)
2983 switch (TREE_CODE (exp))
2986 /* For ADDR_EXPR, we do not want to copy the decl whose address
2987 is requested. We do want to copy constants though. */
2988 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
2989 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2990 copy_constant (TREE_OPERAND (exp, 0)));
2992 return copy_node (exp);
2997 return copy_node (exp);
3000 return build_complex (TREE_TYPE (exp),
3001 copy_constant (TREE_REALPART (exp)),
3002 copy_constant (TREE_IMAGPART (exp)));
3006 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
3007 copy_constant (TREE_OPERAND (exp, 0)),
3008 copy_constant (TREE_OPERAND (exp, 1)));
3012 case NON_LVALUE_EXPR:
3013 case VIEW_CONVERT_EXPR:
3014 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3015 copy_constant (TREE_OPERAND (exp, 0)));
3019 tree copy = copy_node (exp);
3020 VEC(constructor_elt, gc) *v;
3021 unsigned HOST_WIDE_INT idx;
3022 tree purpose, value;
3024 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
3025 CONSTRUCTOR_ELTS (exp)));
3026 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
3028 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
3029 ce->index = purpose;
3030 ce->value = copy_constant (value);
3032 CONSTRUCTOR_ELTS (copy) = v;
3038 tree t = lang_hooks.expand_constant (exp);
3040 gcc_assert (t != exp);
3041 return copy_constant (t);
3046 /* Return the alignment of constant EXP in bits. */
3049 get_constant_alignment (tree exp)
3053 align = TYPE_ALIGN (TREE_TYPE (exp));
3054 #ifdef CONSTANT_ALIGNMENT
3055 align = CONSTANT_ALIGNMENT (exp, align);
3060 /* Return the section into which constant EXP should be placed. */
3063 get_constant_section (tree exp)
3065 if (IN_NAMED_SECTION (exp))
3066 return get_named_section (exp, NULL, compute_reloc_for_constant (exp));
3068 return targetm.asm_out.select_section (exp,
3069 compute_reloc_for_constant (exp),
3070 get_constant_alignment (exp));
3073 /* Return the size of constant EXP in bytes. */
3075 static HOST_WIDE_INT
3076 get_constant_size (tree exp)
3080 size = int_size_in_bytes (TREE_TYPE (exp));
3081 if (TREE_CODE (exp) == STRING_CST)
3082 size = MAX (TREE_STRING_LENGTH (exp), size);
3086 /* Subroutine of output_constant_def:
3087 No constant equal to EXP is known to have been output.
3088 Make a constant descriptor to enter EXP in the hash table.
3089 Assign the label number and construct RTL to refer to the
3090 constant's location in memory.
3091 Caller is responsible for updating the hash table. */
3093 static struct constant_descriptor_tree *
3094 build_constant_desc (tree exp)
3100 struct constant_descriptor_tree *desc;
3102 desc = ggc_alloc (sizeof (*desc));
3103 desc->value = copy_constant (exp);
3105 /* Propagate marked-ness to copied constant. */
3106 if (flag_mudflap && mf_marked_p (exp))
3107 mf_mark (desc->value);
3109 /* Create a string containing the label name, in LABEL. */
3110 labelno = const_labelno++;
3111 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
3113 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3114 if (use_object_blocks_p ())
3116 section *sect = get_constant_section (exp);
3117 symbol = create_block_symbol (ggc_strdup (label),
3118 get_block_for_section (sect), -1);
3121 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3122 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3123 SET_SYMBOL_REF_DECL (symbol, desc->value);
3124 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3126 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
3127 set_mem_attributes (rtl, exp, 1);
3128 set_mem_alias_set (rtl, 0);
3129 set_mem_alias_set (rtl, const_alias_set);
3131 /* Set flags or add text to the name to record information, such as
3132 that it is a local symbol. If the name is changed, the macro
3133 ASM_OUTPUT_LABELREF will have to know how to strip this
3134 information. This call might invalidate our local variable
3135 SYMBOL; we can't use it afterward. */
3137 targetm.encode_section_info (exp, rtl, true);
3144 /* Return an rtx representing a reference to constant data in memory
3145 for the constant expression EXP.
3147 If assembler code for such a constant has already been output,
3148 return an rtx to refer to it.
3149 Otherwise, output such a constant in memory
3150 and generate an rtx for it.
3152 If DEFER is nonzero, this constant can be deferred and output only
3153 if referenced in the function after all optimizations.
3155 `const_desc_table' records which constants already have label strings. */
3158 output_constant_def (tree exp, int defer)
3160 struct constant_descriptor_tree *desc;
3161 struct constant_descriptor_tree key;
3164 /* Look up EXP in the table of constant descriptors. If we didn't find
3165 it, create a new one. */
3167 key.hash = const_hash_1 (exp);
3168 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
3173 desc = build_constant_desc (exp);
3174 desc->hash = key.hash;
3178 maybe_output_constant_def_contents (desc, defer);
3182 /* Subroutine of output_constant_def: Decide whether or not we need to
3183 output the constant DESC now, and if so, do it. */
3185 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
3188 rtx symbol = XEXP (desc->rtl, 0);
3189 tree exp = desc->value;
3191 if (flag_syntax_only)
3194 if (TREE_ASM_WRITTEN (exp))
3195 /* Already output; don't do it again. */
3198 /* We can always defer constants as long as the context allows
3202 /* Increment n_deferred_constants if it exists. It needs to be at
3203 least as large as the number of constants actually referred to
3204 by the function. If it's too small we'll stop looking too early
3205 and fail to emit constants; if it's too large we'll only look
3206 through the entire function when we could have stopped earlier. */
3208 n_deferred_constants++;
3212 output_constant_def_contents (symbol);
3215 /* Subroutine of output_constant_def_contents. Output the definition
3216 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3217 constant's alignment in bits. */
3220 assemble_constant_contents (tree exp, const char *label, unsigned int align)
3224 size = get_constant_size (exp);
3226 /* Do any machine/system dependent processing of the constant. */
3227 #ifdef ASM_DECLARE_CONSTANT_NAME
3228 ASM_DECLARE_CONSTANT_NAME (asm_out_file, label, exp, size);
3230 /* Standard thing is just output label for the constant. */
3231 ASM_OUTPUT_LABEL (asm_out_file, label);
3232 #endif /* ASM_DECLARE_CONSTANT_NAME */
3234 /* Output the value of EXP. */
3235 output_constant (exp, size, align);
3238 /* We must output the constant data referred to by SYMBOL; do so. */
3241 output_constant_def_contents (rtx symbol)
3243 tree exp = SYMBOL_REF_DECL (symbol);
3246 /* Make sure any other constants whose addresses appear in EXP
3247 are assigned label numbers. */
3248 output_addressed_constants (exp);
3250 /* We are no longer deferring this constant. */
3251 TREE_ASM_WRITTEN (exp) = 1;
3253 /* If the constant is part of an object block, make sure that the
3254 decl has been positioned within its block, but do not write out
3255 its definition yet. output_object_blocks will do that later. */
3256 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
3257 place_block_symbol (symbol);
3260 switch_to_section (get_constant_section (exp));
3261 align = get_constant_alignment (exp);
3262 if (align > BITS_PER_UNIT)
3263 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
3264 assemble_constant_contents (exp, XSTR (symbol, 0), align);
3267 mudflap_enqueue_constant (exp);
3270 /* Look up EXP in the table of constant descriptors. Return the rtl
3271 if it has been emitted, else null. */
3274 lookup_constant_def (tree exp)
3276 struct constant_descriptor_tree *desc;
3277 struct constant_descriptor_tree key;
3280 key.hash = const_hash_1 (exp);
3281 desc = htab_find_with_hash (const_desc_htab, &key, key.hash);
3283 return (desc ? desc->rtl : NULL_RTX);
3286 /* Used in the hash tables to avoid outputting the same constant
3287 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3288 are output once per function, not once per file. */
3289 /* ??? Only a few targets need per-function constant pools. Most
3290 can use one per-file pool. Should add a targetm bit to tell the
3293 struct rtx_constant_pool GTY(())
3295 /* Pointers to first and last constant in pool, as ordered by offset. */
3296 struct constant_descriptor_rtx *first;
3297 struct constant_descriptor_rtx *last;
3299 /* Hash facility for making memory-constants from constant rtl-expressions.
3300 It is used on RISC machines where immediate integer arguments and
3301 constant addresses are restricted so that such constants must be stored
3303 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
3305 /* Current offset in constant pool (does not include any
3306 machine-specific header). */
3307 HOST_WIDE_INT offset;
3310 struct constant_descriptor_rtx GTY((chain_next ("%h.next")))
3312 struct constant_descriptor_rtx *next;
3316 HOST_WIDE_INT offset;
3318 enum machine_mode mode;
3324 /* Hash and compare functions for const_rtx_htab. */
3327 const_desc_rtx_hash (const void *ptr)
3329 const struct constant_descriptor_rtx *desc = ptr;
3334 const_desc_rtx_eq (const void *a, const void *b)
3336 const struct constant_descriptor_rtx *x = a;
3337 const struct constant_descriptor_rtx *y = b;
3339 if (x->mode != y->mode)
3341 return rtx_equal_p (x->constant, y->constant);
3344 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3347 const_rtx_hash_1 (rtx *xp, void *data)
3349 unsigned HOST_WIDE_INT hwi;
3350 enum machine_mode mode;
3356 code = GET_CODE (x);
3357 mode = GET_MODE (x);
3358 h = (hashval_t) code * 1048573 + mode;
3366 const int shift = sizeof (hashval_t) * CHAR_BIT;
3367 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3370 h ^= (hashval_t) hwi;
3371 for (i = 1; i < n; ++i)
3374 h ^= (hashval_t) hwi;
3380 if (mode == VOIDmode)
3382 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3386 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3392 for (i = XVECLEN (x, 0); i-- > 0; )
3393 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3398 h ^= htab_hash_string (XSTR (x, 0));
3402 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3406 case UNSPEC_VOLATILE:
3407 h = h * 251 + XINT (x, 1);
3415 *hp = *hp * 509 + h;
3419 /* Compute a hash value for X, which should be a constant. */
3422 const_rtx_hash (rtx x)
3425 for_each_rtx (&x, const_rtx_hash_1, &h);
3430 /* Create and return a new rtx constant pool. */
3432 static struct rtx_constant_pool *
3433 create_constant_pool (void)
3435 struct rtx_constant_pool *pool;
3437 pool = ggc_alloc (sizeof (struct rtx_constant_pool));
3438 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3439 const_desc_rtx_eq, NULL);
3446 /* Initialize constant pool hashing for a new function. */
3449 init_varasm_status (struct function *f)
3451 struct varasm_status *p;
3453 p = ggc_alloc (sizeof (struct varasm_status));
3456 p->pool = create_constant_pool ();
3457 p->deferred_constants = 0;
3460 /* Given a MINUS expression, simplify it if both sides
3461 include the same symbol. */
3464 simplify_subtraction (rtx x)
3466 rtx r = simplify_rtx (x);
3470 /* Given a constant rtx X, make (or find) a memory constant for its value
3471 and return a MEM rtx to refer to it in memory. */
3474 force_const_mem (enum machine_mode mode, rtx x)
3476 struct constant_descriptor_rtx *desc, tmp;
3477 struct rtx_constant_pool *pool;
3484 /* If we're not allowed to drop X into the constant pool, don't. */
3485 if (targetm.cannot_force_const_mem (x))
3488 /* Record that this function has used a constant pool entry. */
3489 current_function_uses_const_pool = 1;
3491 /* Decide which pool to use. */
3492 pool = (targetm.use_blocks_for_constant_p (mode, x)
3493 ? shared_constant_pool
3494 : cfun->varasm->pool);
3496 /* Lookup the value in the hashtable. */
3499 hash = const_rtx_hash (x);
3500 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3503 /* If the constant was already present, return its memory. */
3505 return copy_rtx (desc->mem);
3507 /* Otherwise, create a new descriptor. */
3508 desc = ggc_alloc (sizeof (*desc));
3511 /* Align the location counter as required by EXP's data type. */
3512 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3513 #ifdef CONSTANT_ALIGNMENT
3515 tree type = lang_hooks.types.type_for_mode (mode, 0);
3516 if (type != NULL_TREE)
3517 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3521 pool->offset += (align / BITS_PER_UNIT) - 1;
3522 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3525 desc->constant = tmp.constant;
3526 desc->offset = pool->offset;
3529 desc->align = align;
3530 desc->labelno = const_labelno;
3533 pool->offset += GET_MODE_SIZE (mode);
3535 pool->last->next = desc;
3537 pool->first = pool->last = desc;
3540 /* Create a string containing the label name, in LABEL. */
3541 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3544 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3545 the constants pool. */
3546 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3548 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3549 symbol = create_block_symbol (ggc_strdup (label),
3550 get_block_for_section (sect), -1);
3553 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3555 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3556 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3557 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3559 /* Construct the MEM. */
3560 desc->mem = def = gen_const_mem (mode, symbol);
3561 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3562 set_mem_align (def, align);
3564 /* If we're dropping a label to the constant pool, make sure we
3566 if (GET_CODE (x) == LABEL_REF)
3567 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3569 return copy_rtx (def);
3572 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3575 get_pool_constant (rtx addr)
3577 return SYMBOL_REF_CONSTANT (addr)->constant;
3580 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3581 and whether it has been output or not. */
3584 get_pool_constant_mark (rtx addr, bool *pmarked)
3586 struct constant_descriptor_rtx *desc;
3588 desc = SYMBOL_REF_CONSTANT (addr);
3589 *pmarked = (desc->mark != 0);
3590 return desc->constant;
3593 /* Similar, return the mode. */
3596 get_pool_mode (rtx addr)
3598 return SYMBOL_REF_CONSTANT (addr)->mode;
3601 /* Return the size of the constant pool. */
3604 get_pool_size (void)
3606 return cfun->varasm->pool->offset;
3609 /* Worker function for output_constant_pool_1. Emit assembly for X
3610 in MODE with known alignment ALIGN. */
3613 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3615 switch (GET_MODE_CLASS (mode))
3618 case MODE_DECIMAL_FLOAT:
3622 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3623 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3624 assemble_real (r, mode, align);
3629 case MODE_PARTIAL_INT:
3630 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3633 case MODE_VECTOR_FLOAT:
3634 case MODE_VECTOR_INT:
3637 enum machine_mode submode = GET_MODE_INNER (mode);
3638 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3640 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3641 units = CONST_VECTOR_NUNITS (x);
3643 for (i = 0; i < units; i++)
3645 rtx elt = CONST_VECTOR_ELT (x, i);
3646 output_constant_pool_2 (submode, elt, i ? subalign : align);
3656 /* Worker function for output_constant_pool. Emit constant DESC,
3657 giving it ALIGN bits of alignment. */
3660 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3667 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3668 whose CODE_LABEL has been deleted. This can occur if a jump table
3669 is eliminated by optimization. If so, write a constant of zero
3670 instead. Note that this can also happen by turning the
3671 CODE_LABEL into a NOTE. */
3672 /* ??? This seems completely and utterly wrong. Certainly it's
3673 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3674 functioning even with INSN_DELETED_P and friends. */
3677 switch (GET_CODE (x))
3680 if (GET_CODE (XEXP (x, 0)) != PLUS
3681 || GET_CODE (XEXP (XEXP (x, 0), 0)) != LABEL_REF)
3683 tmp = XEXP (XEXP (x, 0), 0);
3688 gcc_assert (!INSN_DELETED_P (tmp));
3689 gcc_assert (!NOTE_P (tmp)
3690 || NOTE_LINE_NUMBER (tmp) != NOTE_INSN_DELETED);
3697 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3698 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3699 align, desc->labelno, done);
3702 assemble_align (align);
3704 /* Output the label. */
3705 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3707 /* Output the data. */
3708 output_constant_pool_2 (desc->mode, x, align);
3710 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3711 sections have proper size. */
3712 if (align > GET_MODE_BITSIZE (desc->mode)
3714 && (in_section->common.flags & SECTION_MERGE))
3715 assemble_align (align);
3717 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3723 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3724 to as used. Emit referenced deferred strings. This function can
3725 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3728 mark_constant (rtx *current_rtx, void *data ATTRIBUTE_UNUSED)
3730 rtx x = *current_rtx;
3732 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3735 if (CONSTANT_POOL_ADDRESS_P (x))
3737 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3738 if (desc->mark == 0)
3741 for_each_rtx (&desc->constant, mark_constant, NULL);
3744 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3746 tree exp = SYMBOL_REF_DECL (x);
3747 if (!TREE_ASM_WRITTEN (exp))
3749 n_deferred_constants--;
3750 output_constant_def_contents (x);
3757 /* Look through appropriate parts of INSN, marking all entries in the
3758 constant pool which are actually being used. Entries that are only
3759 referenced by other constants are also marked as used. Emit
3760 deferred strings that are used. */
3763 mark_constants (rtx insn)
3768 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3769 insns, not any notes that may be attached. We don't want to mark
3770 a constant just because it happens to appear in a REG_EQUIV note. */
3771 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3773 rtx seq = PATTERN (insn);
3774 int i, n = XVECLEN (seq, 0);
3775 for (i = 0; i < n; ++i)
3777 rtx subinsn = XVECEXP (seq, 0, i);
3778 if (INSN_P (subinsn))
3779 for_each_rtx (&PATTERN (subinsn), mark_constant, NULL);
3783 for_each_rtx (&PATTERN (insn), mark_constant, NULL);
3786 /* Look through the instructions for this function, and mark all the
3787 entries in POOL which are actually being used. Emit deferred constants
3788 which have indeed been used. */
3791 mark_constant_pool (void)
3795 if (!current_function_uses_const_pool && n_deferred_constants == 0)
3798 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3799 mark_constants (insn);
3801 for (link = current_function_epilogue_delay_list;
3803 link = XEXP (link, 1))
3804 mark_constants (XEXP (link, 0));
3807 /* Write all the constants in POOL. */
3810 output_constant_pool_contents (struct rtx_constant_pool *pool)
3812 struct constant_descriptor_rtx *desc;
3814 for (desc = pool->first; desc ; desc = desc->next)
3817 /* If the constant is part of an object_block, make sure that
3818 the constant has been positioned within its block, but do not
3819 write out its definition yet. output_object_blocks will do
3821 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
3822 && SYMBOL_REF_BLOCK (desc->sym))
3823 place_block_symbol (desc->sym);
3826 switch_to_section (targetm.asm_out.select_rtx_section
3827 (desc->mode, desc->constant, desc->align));
3828 output_constant_pool_1 (desc, desc->align);
3833 /* Mark all constants that are used in the current function, then write
3834 out the function's private constant pool. */
3837 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3838 tree fndecl ATTRIBUTE_UNUSED)
3840 struct rtx_constant_pool *pool = cfun->varasm->pool;
3842 /* It is possible for gcc to call force_const_mem and then to later
3843 discard the instructions which refer to the constant. In such a
3844 case we do not need to output the constant. */
3845 mark_constant_pool ();
3847 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3848 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3851 output_constant_pool_contents (pool);
3853 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3854 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3858 /* Write the contents of the shared constant pool. */
3861 output_shared_constant_pool (void)
3863 output_constant_pool_contents (shared_constant_pool);
3866 /* Determine what kind of relocations EXP may need. */
3869 compute_reloc_for_constant (tree exp)
3871 int reloc = 0, reloc2;
3874 /* Give the front-end a chance to convert VALUE to something that
3875 looks more like a constant to the back-end. */
3876 exp = lang_hooks.expand_constant (exp);
3878 switch (TREE_CODE (exp))
3882 /* Go inside any operations that get_inner_reference can handle and see
3883 if what's inside is a constant: no need to do anything here for
3884 addresses of variables or functions. */
3885 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3886 tem = TREE_OPERAND (tem, 0))
3889 if (TREE_PUBLIC (tem))
3896 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3897 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3901 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3902 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3903 /* The difference of two local labels is computable at link time. */
3904 if (reloc == 1 && reloc2 == 1)
3912 case NON_LVALUE_EXPR:
3913 case VIEW_CONVERT_EXPR:
3914 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3919 unsigned HOST_WIDE_INT idx;
3920 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3922 reloc |= compute_reloc_for_constant (tem);
3932 /* Find all the constants whose addresses are referenced inside of EXP,
3933 and make sure assembler code with a label has been output for each one.
3934 Indicate whether an ADDR_EXPR has been encountered. */
3937 output_addressed_constants (tree exp)
3941 /* Give the front-end a chance to convert VALUE to something that
3942 looks more like a constant to the back-end. */
3943 exp = lang_hooks.expand_constant (exp);
3945 switch (TREE_CODE (exp))
3949 /* Go inside any operations that get_inner_reference can handle and see
3950 if what's inside is a constant: no need to do anything here for
3951 addresses of variables or functions. */
3952 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3953 tem = TREE_OPERAND (tem, 0))
3956 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3957 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
3958 tem = DECL_INITIAL (tem);
3960 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
3961 output_constant_def (tem, 0);
3966 output_addressed_constants (TREE_OPERAND (exp, 1));
3971 case NON_LVALUE_EXPR:
3972 case VIEW_CONVERT_EXPR:
3973 output_addressed_constants (TREE_OPERAND (exp, 0));
3978 unsigned HOST_WIDE_INT idx;
3979 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3981 output_addressed_constants (tem);
3990 /* Whether a constructor CTOR is a valid static constant initializer if all
3991 its elements are. This used to be internal to initializer_constant_valid_p
3992 and has been exposed to let other functions like categorize_ctor_elements
3993 evaluate the property while walking a constructor for other purposes. */
3996 constructor_static_from_elts_p (tree ctor)
3998 return (TREE_CONSTANT (ctor)
3999 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4000 || TREE_CODE (TREE_TYPE (ctor)) == RECORD_TYPE)
4001 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (ctor)));
4004 /* Return nonzero if VALUE is a valid constant-valued expression
4005 for use in initializing a static variable; one that can be an
4006 element of a "constant" initializer.
4008 Return null_pointer_node if the value is absolute;
4009 if it is relocatable, return the variable that determines the relocation.
4010 We assume that VALUE has been folded as much as possible;
4011 therefore, we do not need to check for such things as
4012 arithmetic-combinations of integers. */
4015 initializer_constant_valid_p (tree value, tree endtype)
4017 /* Give the front-end a chance to convert VALUE to something that
4018 looks more like a constant to the back-end. */
4019 value = lang_hooks.expand_constant (value);
4021 switch (TREE_CODE (value))
4024 if (constructor_static_from_elts_p (value))
4026 unsigned HOST_WIDE_INT idx;
4028 bool absolute = true;
4030 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4033 reloc = initializer_constant_valid_p (elt, TREE_TYPE (elt));
4036 if (reloc != null_pointer_node)
4039 /* For a non-absolute relocation, there is no single
4040 variable that can be "the variable that determines the
4042 return absolute ? null_pointer_node : error_mark_node;
4045 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
4052 return null_pointer_node;
4056 value = staticp (TREE_OPERAND (value, 0));
4059 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out to
4060 be a constant, this is old-skool offsetof-like nonsense. */
4061 if (TREE_CODE (value) == INDIRECT_REF
4062 && TREE_CONSTANT (TREE_OPERAND (value, 0)))
4063 return null_pointer_node;
4064 /* Taking the address of a nested function involves a trampoline. */
4065 if (TREE_CODE (value) == FUNCTION_DECL
4066 && decl_function_context (value)
4067 && !DECL_NO_STATIC_CHAIN (value))
4069 /* "&{...}" requires a temporary to hold the constructed
4071 if (TREE_CODE (value) == CONSTRUCTOR)
4076 case VIEW_CONVERT_EXPR:
4077 case NON_LVALUE_EXPR:
4078 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
4087 src = TREE_OPERAND (value, 0);
4088 src_type = TREE_TYPE (src);
4089 dest_type = TREE_TYPE (value);
4091 /* Allow conversions between pointer types, floating-point
4092 types, and offset types. */
4093 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
4094 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
4095 || (TREE_CODE (dest_type) == OFFSET_TYPE
4096 && TREE_CODE (src_type) == OFFSET_TYPE))
4097 return initializer_constant_valid_p (src, endtype);
4099 /* Allow length-preserving conversions between integer types. */
4100 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
4101 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
4102 return initializer_constant_valid_p (src, endtype);
4104 /* Allow conversions between other integer types only if
4106 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
4108 tree inner = initializer_constant_valid_p (src, endtype);
4109 if (inner == null_pointer_node)
4110 return null_pointer_node;
4114 /* Allow (int) &foo provided int is as wide as a pointer. */
4115 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
4116 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
4117 return initializer_constant_valid_p (src, endtype);
4119 /* Likewise conversions from int to pointers, but also allow
4120 conversions from 0. */
4121 if ((POINTER_TYPE_P (dest_type)
4122 || TREE_CODE (dest_type) == OFFSET_TYPE)
4123 && INTEGRAL_TYPE_P (src_type))
4125 if (TREE_CODE (src) == INTEGER_CST
4126 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
4127 return null_pointer_node;
4128 if (integer_zerop (src))
4129 return null_pointer_node;
4130 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
4131 return initializer_constant_valid_p (src, endtype);
4134 /* Allow conversions to struct or union types if the value
4136 if (TREE_CODE (dest_type) == RECORD_TYPE
4137 || TREE_CODE (dest_type) == UNION_TYPE)
4138 return initializer_constant_valid_p (src, endtype);
4143 if (! INTEGRAL_TYPE_P (endtype)
4144 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
4146 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4148 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
4150 /* If either term is absolute, use the other terms relocation. */
4151 if (valid0 == null_pointer_node)
4153 if (valid1 == null_pointer_node)
4159 if (! INTEGRAL_TYPE_P (endtype)
4160 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
4162 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
4164 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
4166 /* Win if second argument is absolute. */
4167 if (valid1 == null_pointer_node)
4169 /* Win if both arguments have the same relocation.
4170 Then the value is absolute. */
4171 if (valid0 == valid1 && valid0 != 0)
4172 return null_pointer_node;
4174 /* Since GCC guarantees that string constants are unique in the
4175 generated code, a subtraction between two copies of the same
4176 constant string is absolute. */
4177 if (valid0 && TREE_CODE (valid0) == STRING_CST
4178 && valid1 && TREE_CODE (valid1) == STRING_CST
4179 && operand_equal_p (valid0, valid1, 1))
4180 return null_pointer_node;
4183 /* Support narrowing differences. */
4184 if (INTEGRAL_TYPE_P (endtype))
4188 op0 = TREE_OPERAND (value, 0);
4189 op1 = TREE_OPERAND (value, 1);
4191 /* Like STRIP_NOPS except allow the operand mode to widen.
4192 This works around a feature of fold that simplifies
4193 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
4194 that the narrower operation is cheaper. */
4196 while (TREE_CODE (op0) == NOP_EXPR
4197 || TREE_CODE (op0) == CONVERT_EXPR
4198 || TREE_CODE (op0) == NON_LVALUE_EXPR)
4200 tree inner = TREE_OPERAND (op0, 0);
4201 if (inner == error_mark_node
4202 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4203 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
4204 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4209 while (TREE_CODE (op1) == NOP_EXPR
4210 || TREE_CODE (op1) == CONVERT_EXPR
4211 || TREE_CODE (op1) == NON_LVALUE_EXPR)
4213 tree inner = TREE_OPERAND (op1, 0);
4214 if (inner == error_mark_node
4215 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4216 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
4217 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4222 op0 = initializer_constant_valid_p (op0, endtype);
4223 op1 = initializer_constant_valid_p (op1, endtype);
4225 /* Both initializers must be known. */
4229 return null_pointer_node;
4231 /* Support differences between labels. */
4232 if (TREE_CODE (op0) == LABEL_DECL
4233 && TREE_CODE (op1) == LABEL_DECL)
4234 return null_pointer_node;
4236 if (TREE_CODE (op0) == STRING_CST
4237 && TREE_CODE (op1) == STRING_CST
4238 && operand_equal_p (op0, op1, 1))
4239 return null_pointer_node;
4251 /* Output assembler code for constant EXP to FILE, with no label.
4252 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4253 Assumes output_addressed_constants has been done on EXP already.
4255 Generate exactly SIZE bytes of assembler data, padding at the end
4256 with zeros if necessary. SIZE must always be specified.
4258 SIZE is important for structure constructors,
4259 since trailing members may have been omitted from the constructor.
4260 It is also important for initialization of arrays from string constants
4261 since the full length of the string constant might not be wanted.
4262 It is also needed for initialization of unions, where the initializer's
4263 type is just one member, and that may not be as long as the union.
4265 There a case in which we would fail to output exactly SIZE bytes:
4266 for a structure constructor that wants to produce more than SIZE bytes.
4267 But such constructors will never be generated for any possible input.
4269 ALIGN is the alignment of the data in bits. */
4272 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
4274 enum tree_code code;
4275 unsigned HOST_WIDE_INT thissize;
4277 /* Some front-ends use constants other than the standard language-independent
4278 varieties, but which may still be output directly. Give the front-end a
4279 chance to convert EXP to a language-independent representation. */
4280 exp = lang_hooks.expand_constant (exp);
4282 if (size == 0 || flag_syntax_only)
4285 /* See if we're trying to initialize a pointer in a non-default mode
4286 to the address of some declaration somewhere. If the target says
4287 the mode is valid for pointers, assume the target has a way of
4289 if (TREE_CODE (exp) == NOP_EXPR
4290 && POINTER_TYPE_P (TREE_TYPE (exp))
4291 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
4293 tree saved_type = TREE_TYPE (exp);
4295 /* Peel off any intermediate conversions-to-pointer for valid
4297 while (TREE_CODE (exp) == NOP_EXPR
4298 && POINTER_TYPE_P (TREE_TYPE (exp))
4299 && targetm.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp))))
4300 exp = TREE_OPERAND (exp, 0);
4302 /* If what we're left with is the address of something, we can
4303 convert the address to the final type and output it that
4305 if (TREE_CODE (exp) == ADDR_EXPR)
4306 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
4307 /* Likewise for constant ints. */
4308 else if (TREE_CODE (exp) == INTEGER_CST)
4309 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
4310 TREE_INT_CST_HIGH (exp));
4314 /* Eliminate any conversions since we'll be outputting the underlying
4316 while (TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
4317 || TREE_CODE (exp) == NON_LVALUE_EXPR
4318 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4320 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4321 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4323 /* Make sure eliminating the conversion is really a no-op, except with
4324 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4325 union types to allow for Ada unchecked unions. */
4326 if (type_size > op_size
4327 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4328 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4329 /* Keep the conversion. */
4332 exp = TREE_OPERAND (exp, 0);
4335 code = TREE_CODE (TREE_TYPE (exp));
4336 thissize = int_size_in_bytes (TREE_TYPE (exp));
4338 /* Give the front end another chance to expand constants. */
4339 exp = lang_hooks.expand_constant (exp);
4341 /* Allow a constructor with no elements for any data type.
4342 This means to fill the space with zeros. */
4343 if (TREE_CODE (exp) == CONSTRUCTOR
4344 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
4346 assemble_zeros (size);
4350 if (TREE_CODE (exp) == FDESC_EXPR)
4352 #ifdef ASM_OUTPUT_FDESC
4353 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
4354 tree decl = TREE_OPERAND (exp, 0);
4355 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4362 /* Now output the underlying data. If we've handling the padding, return.
4363 Otherwise, break and ensure SIZE is the size written. */
4370 case REFERENCE_TYPE:
4372 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4373 EXPAND_INITIALIZER),
4374 MIN (size, thissize), align, 0))
4375 error ("initializer for integer value is too complicated");
4379 if (TREE_CODE (exp) != REAL_CST)
4380 error ("initializer for floating value is not a floating constant");
4382 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4386 output_constant (TREE_REALPART (exp), thissize / 2, align);
4387 output_constant (TREE_IMAGPART (exp), thissize / 2,
4388 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4393 switch (TREE_CODE (exp))
4396 output_constructor (exp, size, align);
4399 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4401 assemble_string (TREE_STRING_POINTER (exp), thissize);
4408 unsigned int nalign;
4409 enum machine_mode inner;
4411 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4412 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4414 elt_size = GET_MODE_SIZE (inner);
4416 link = TREE_VECTOR_CST_ELTS (exp);
4417 output_constant (TREE_VALUE (link), elt_size, align);
4418 thissize = elt_size;
4419 while ((link = TREE_CHAIN (link)) != NULL)
4421 output_constant (TREE_VALUE (link), elt_size, nalign);
4422 thissize += elt_size;
4433 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4434 output_constructor (exp, size, align);
4444 if (size > thissize)
4445 assemble_zeros (size - thissize);
4449 /* Subroutine of output_constructor, used for computing the size of
4450 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4451 type with an unspecified upper bound. */
4453 static unsigned HOST_WIDE_INT
4454 array_size_for_constructor (tree val)
4457 unsigned HOST_WIDE_INT cnt;
4458 tree index, value, tmp;
4460 /* This code used to attempt to handle string constants that are not
4461 arrays of single-bytes, but nothing else does, so there's no point in
4463 if (TREE_CODE (val) == STRING_CST)
4464 return TREE_STRING_LENGTH (val);
4466 max_index = NULL_TREE;
4467 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4469 if (TREE_CODE (index) == RANGE_EXPR)
4470 index = TREE_OPERAND (index, 1);
4471 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4475 if (max_index == NULL_TREE)
4478 /* Compute the total number of array elements. */
4479 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4480 i = size_binop (MINUS_EXPR, fold_convert (sizetype, max_index),
4481 fold_convert (sizetype, tmp));
4482 i = size_binop (PLUS_EXPR, i, build_int_cst (sizetype, 1));
4484 /* Multiply by the array element unit size to find number of bytes. */
4485 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4487 return tree_low_cst (i, 1);
4490 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4491 Generate at least SIZE bytes, padding if necessary. */
4494 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
4497 tree type = TREE_TYPE (exp);
4500 /* Number of bytes output or skipped so far.
4501 In other words, current position within the constructor. */
4502 HOST_WIDE_INT total_bytes = 0;
4503 /* Nonzero means BYTE contains part of a byte, to be output. */
4504 int byte_buffer_in_use = 0;
4506 unsigned HOST_WIDE_INT cnt;
4507 constructor_elt *ce;
4509 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
4511 if (TREE_CODE (type) == RECORD_TYPE)
4512 field = TYPE_FIELDS (type);
4514 if (TREE_CODE (type) == ARRAY_TYPE
4515 && TYPE_DOMAIN (type) != 0)
4516 min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (type));
4518 /* As LINK goes through the elements of the constant,
4519 FIELD goes through the structure fields, if the constant is a structure.
4520 if the constant is a union, then we override this,
4521 by getting the field from the TREE_LIST element.
4522 But the constant could also be an array. Then FIELD is zero.
4524 There is always a maximum of one element in the chain LINK for unions
4525 (even if the initializer in a source program incorrectly contains
4528 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
4529 cnt++, field = field ? TREE_CHAIN (field) : 0)
4531 tree val = ce->value;
4534 /* The element in a union constructor specifies the proper field
4536 if ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
4537 || TREE_CODE (type) == QUAL_UNION_TYPE)
4541 else if (TREE_CODE (type) == ARRAY_TYPE)
4544 #ifdef ASM_COMMENT_START
4545 if (field && flag_verbose_asm)
4546 fprintf (asm_out_file, "%s %s:\n",
4549 ? IDENTIFIER_POINTER (DECL_NAME (field))
4553 /* Eliminate the marker that makes a cast not be an lvalue. */
4557 if (index && TREE_CODE (index) == RANGE_EXPR)
4559 unsigned HOST_WIDE_INT fieldsize
4560 = int_size_in_bytes (TREE_TYPE (type));
4561 HOST_WIDE_INT lo_index = tree_low_cst (TREE_OPERAND (index, 0), 0);
4562 HOST_WIDE_INT hi_index = tree_low_cst (TREE_OPERAND (index, 1), 0);
4563 HOST_WIDE_INT index;
4564 unsigned int align2 = min_align (align, fieldsize * BITS_PER_UNIT);
4566 for (index = lo_index; index <= hi_index; index++)
4568 /* Output the element's initial value. */
4570 assemble_zeros (fieldsize);
4572 output_constant (val, fieldsize, align2);
4574 /* Count its size. */
4575 total_bytes += fieldsize;
4578 else if (field == 0 || !DECL_BIT_FIELD (field))
4580 /* An element that is not a bit-field. */
4582 unsigned HOST_WIDE_INT fieldsize;
4583 /* Since this structure is static,
4584 we know the positions are constant. */
4585 HOST_WIDE_INT pos = field ? int_byte_position (field) : 0;
4586 unsigned int align2;
4589 pos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val)), 1)
4590 * (tree_low_cst (index, 0) - tree_low_cst (min_index, 0)));
4592 /* Output any buffered-up bit-fields preceding this element. */
4593 if (byte_buffer_in_use)
4595 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4597 byte_buffer_in_use = 0;
4600 /* Advance to offset of this element.
4601 Note no alignment needed in an array, since that is guaranteed
4602 if each element has the proper size. */
4603 if ((field != 0 || index != 0) && pos != total_bytes)
4605 gcc_assert (pos >= total_bytes);
4606 assemble_zeros (pos - total_bytes);
4610 /* Find the alignment of this element. */
4611 align2 = min_align (align, BITS_PER_UNIT * pos);
4613 /* Determine size this element should occupy. */
4618 /* If this is an array with an unspecified upper bound,
4619 the initializer determines the size. */
4620 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4621 but we cannot do this until the deprecated support for
4622 initializing zero-length array members is removed. */
4623 if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
4624 && TYPE_DOMAIN (TREE_TYPE (field))
4625 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field))))
4627 fieldsize = array_size_for_constructor (val);
4628 /* Given a non-empty initialization, this field had
4630 gcc_assert (!fieldsize || !TREE_CHAIN (field));
4632 else if (DECL_SIZE_UNIT (field))
4634 /* ??? This can't be right. If the decl size overflows
4635 a host integer we will silently emit no data. */
4636 if (host_integerp (DECL_SIZE_UNIT (field), 1))
4637 fieldsize = tree_low_cst (DECL_SIZE_UNIT (field), 1);
4641 fieldsize = int_size_in_bytes (TREE_TYPE (type));
4643 /* Output the element's initial value. */
4645 assemble_zeros (fieldsize);
4647 output_constant (val, fieldsize, align2);
4649 /* Count its size. */
4650 total_bytes += fieldsize;
4652 else if (val != 0 && TREE_CODE (val) != INTEGER_CST)
4653 error ("invalid initial value for member %qs",
4654 IDENTIFIER_POINTER (DECL_NAME (field)));
4657 /* Element that is a bit-field. */
4659 HOST_WIDE_INT next_offset = int_bit_position (field);
4660 HOST_WIDE_INT end_offset
4661 = (next_offset + tree_low_cst (DECL_SIZE (field), 1));
4664 val = integer_zero_node;
4666 /* If this field does not start in this (or, next) byte,
4668 if (next_offset / BITS_PER_UNIT != total_bytes)
4670 /* Output remnant of any bit field in previous bytes. */
4671 if (byte_buffer_in_use)
4673 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4675 byte_buffer_in_use = 0;
4678 /* If still not at proper byte, advance to there. */
4679 if (next_offset / BITS_PER_UNIT != total_bytes)
4681 gcc_assert (next_offset / BITS_PER_UNIT >= total_bytes);
4682 assemble_zeros (next_offset / BITS_PER_UNIT - total_bytes);
4683 total_bytes = next_offset / BITS_PER_UNIT;
4687 if (! byte_buffer_in_use)
4690 /* We must split the element into pieces that fall within
4691 separate bytes, and combine each byte with previous or
4692 following bit-fields. */
4694 /* next_offset is the offset n fbits from the beginning of
4695 the structure to the next bit of this element to be processed.
4696 end_offset is the offset of the first bit past the end of
4698 while (next_offset < end_offset)
4702 HOST_WIDE_INT value;
4703 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4704 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4706 /* Advance from byte to byte
4707 within this element when necessary. */
4708 while (next_byte != total_bytes)
4710 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4715 /* Number of bits we can process at once
4716 (all part of the same byte). */
4717 this_time = MIN (end_offset - next_offset,
4718 BITS_PER_UNIT - next_bit);
4719 if (BYTES_BIG_ENDIAN)
4721 /* On big-endian machine, take the most significant bits
4722 first (of the bits that are significant)
4723 and put them into bytes from the most significant end. */
4724 shift = end_offset - next_offset - this_time;
4726 /* Don't try to take a bunch of bits that cross
4727 the word boundary in the INTEGER_CST. We can
4728 only select bits from the LOW or HIGH part
4730 if (shift < HOST_BITS_PER_WIDE_INT
4731 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4733 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
4734 shift = HOST_BITS_PER_WIDE_INT;
4737 /* Now get the bits from the appropriate constant word. */
4738 if (shift < HOST_BITS_PER_WIDE_INT)
4739 value = TREE_INT_CST_LOW (val);
4742 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4743 value = TREE_INT_CST_HIGH (val);
4744 shift -= HOST_BITS_PER_WIDE_INT;
4747 /* Get the result. This works only when:
4748 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4749 byte |= (((value >> shift)
4750 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4751 << (BITS_PER_UNIT - this_time - next_bit));
4755 /* On little-endian machines,
4756 take first the least significant bits of the value
4757 and pack them starting at the least significant
4758 bits of the bytes. */
4759 shift = next_offset - int_bit_position (field);
4761 /* Don't try to take a bunch of bits that cross
4762 the word boundary in the INTEGER_CST. We can
4763 only select bits from the LOW or HIGH part
4765 if (shift < HOST_BITS_PER_WIDE_INT
4766 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4767 this_time = (HOST_BITS_PER_WIDE_INT - shift);
4769 /* Now get the bits from the appropriate constant word. */
4770 if (shift < HOST_BITS_PER_WIDE_INT)
4771 value = TREE_INT_CST_LOW (val);
4774 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
4775 value = TREE_INT_CST_HIGH (val);
4776 shift -= HOST_BITS_PER_WIDE_INT;
4779 /* Get the result. This works only when:
4780 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4781 byte |= (((value >> shift)
4782 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4786 next_offset += this_time;
4787 byte_buffer_in_use = 1;
4792 if (byte_buffer_in_use)
4794 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4798 if ((unsigned HOST_WIDE_INT)total_bytes < size)
4799 assemble_zeros (size - total_bytes);
4802 /* This TREE_LIST contains any weak symbol declarations waiting
4804 static GTY(()) tree weak_decls;
4806 /* Mark DECL as weak. */
4809 mark_weak (tree decl)
4811 DECL_WEAK (decl) = 1;
4813 if (DECL_RTL_SET_P (decl)
4814 && MEM_P (DECL_RTL (decl))
4815 && XEXP (DECL_RTL (decl), 0)
4816 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
4817 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
4820 /* Merge weak status between NEWDECL and OLDDECL. */
4823 merge_weak (tree newdecl, tree olddecl)
4825 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
4827 if (DECL_WEAK (newdecl) && SUPPORTS_WEAK)
4830 /* We put the NEWDECL on the weak_decls list at some point
4831 and OLDDECL as well. Keep just OLDDECL on the list. */
4832 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
4833 if (TREE_VALUE (*pwd) == newdecl)
4835 *pwd = TREE_CHAIN (*pwd);
4842 if (DECL_WEAK (newdecl))
4846 /* NEWDECL is weak, but OLDDECL is not. */
4848 /* If we already output the OLDDECL, we're in trouble; we can't
4849 go back and make it weak. This error cannot caught in
4850 declare_weak because the NEWDECL and OLDDECL was not yet
4851 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4852 if (TREE_ASM_WRITTEN (olddecl))
4853 error ("weak declaration of %q+D must precede definition",
4856 /* If we've already generated rtl referencing OLDDECL, we may
4857 have done so in a way that will not function properly with
4859 else if (TREE_USED (olddecl)
4860 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)))
4861 warning (0, "weak declaration of %q+D after first use results "
4862 "in unspecified behavior", newdecl);
4866 /* We put the NEWDECL on the weak_decls list at some point.
4867 Replace it with the OLDDECL. */
4868 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
4869 if (TREE_VALUE (wd) == newdecl)
4871 TREE_VALUE (wd) = olddecl;
4874 /* We may not find the entry on the list. If NEWDECL is a
4875 weak alias, then we will have already called
4876 globalize_decl to remove the entry; in that case, we do
4877 not need to do anything. */
4880 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4881 mark_weak (olddecl);
4884 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4885 weak. Just update NEWDECL to indicate that it's weak too. */
4886 mark_weak (newdecl);
4889 /* Declare DECL to be a weak symbol. */
4892 declare_weak (tree decl)
4894 if (! TREE_PUBLIC (decl))
4895 error ("weak declaration of %q+D must be public", decl);
4896 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
4897 error ("weak declaration of %q+D must precede definition", decl);
4898 else if (SUPPORTS_WEAK)
4900 if (! DECL_WEAK (decl))
4901 weak_decls = tree_cons (NULL, decl, weak_decls);
4904 warning (0, "weak declaration of %q+D not supported", decl);
4910 weak_finish_1 (tree decl)
4912 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4913 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4916 if (! TREE_USED (decl))
4919 #ifdef ASM_WEAKEN_DECL
4920 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
4922 #ifdef ASM_WEAKEN_LABEL
4923 ASM_WEAKEN_LABEL (asm_out_file, name);
4925 #ifdef ASM_OUTPUT_WEAK_ALIAS
4927 static bool warn_once = 0;
4930 warning (0, "only weak aliases are supported in this configuration");
4940 /* This TREE_LIST contains weakref targets. */
4942 static GTY(()) tree weakref_targets;
4944 /* Forward declaration. */
4945 static tree find_decl_and_mark_needed (tree decl, tree target);
4947 /* Emit any pending weak declarations. */
4954 for (t = weakref_targets; t; t = TREE_CHAIN (t))
4956 tree alias_decl = TREE_PURPOSE (t);
4957 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
4959 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
4960 /* Remove alias_decl from the weak list, but leave entries for
4961 the target alone. */
4963 #ifndef ASM_OUTPUT_WEAKREF
4964 else if (! TREE_SYMBOL_REFERENCED (target))
4966 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
4967 defined, otherwise we and weak_finish_1 would use a
4968 different macros. */
4969 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
4970 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
4972 tree decl = find_decl_and_mark_needed (alias_decl, target);
4976 decl = build_decl (TREE_CODE (alias_decl), target,
4977 TREE_TYPE (alias_decl));
4979 DECL_EXTERNAL (decl) = 1;
4980 TREE_PUBLIC (decl) = 1;
4981 DECL_ARTIFICIAL (decl) = 1;
4982 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
4983 TREE_USED (decl) = 1;
4986 weak_finish_1 (decl);
4995 /* Remove the alias and the target from the pending weak list
4996 so that we do not emit any .weak directives for the former,
4997 nor multiple .weak directives for the latter. */
4998 for (p = &weak_decls; (t2 = *p) ; )
5000 if (TREE_VALUE (t2) == alias_decl
5001 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
5002 *p = TREE_CHAIN (t2);
5004 p = &TREE_CHAIN (t2);
5007 /* Remove other weakrefs to the same target, to speed things up. */
5008 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
5010 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
5011 *p = TREE_CHAIN (t2);
5013 p = &TREE_CHAIN (t2);
5018 for (t = weak_decls; t; t = TREE_CHAIN (t))
5020 tree decl = TREE_VALUE (t);
5022 weak_finish_1 (decl);
5026 /* Emit the assembly bits to indicate that DECL is globally visible. */
5029 globalize_decl (tree decl)
5032 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5033 if (DECL_WEAK (decl))
5035 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
5038 #ifdef ASM_WEAKEN_DECL
5039 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
5041 ASM_WEAKEN_LABEL (asm_out_file, name);
5044 /* Remove this function from the pending weak list so that
5045 we do not emit multiple .weak directives for it. */
5046 for (p = &weak_decls; (t = *p) ; )
5048 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5049 *p = TREE_CHAIN (t);
5051 p = &TREE_CHAIN (t);
5054 /* Remove weakrefs to the same target from the pending weakref
5055 list, for the same reason. */
5056 for (p = &weakref_targets; (t = *p) ; )
5058 if (DECL_ASSEMBLER_NAME (decl)
5059 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5060 *p = TREE_CHAIN (t);
5062 p = &TREE_CHAIN (t);
5069 targetm.asm_out.globalize_decl_name (asm_out_file, decl);
5072 /* We have to be able to tell cgraph about the needed-ness of the target
5073 of an alias. This requires that the decl have been defined. Aliases
5074 that precede their definition have to be queued for later processing. */
5076 typedef struct alias_pair GTY(())
5082 /* Define gc'd vector type. */
5083 DEF_VEC_O(alias_pair);
5084 DEF_VEC_ALLOC_O(alias_pair,gc);
5086 static GTY(()) VEC(alias_pair,gc) *alias_pairs;
5088 /* Given an assembly name, find the decl it is associated with. At the
5089 same time, mark it needed for cgraph. */
5092 find_decl_and_mark_needed (tree decl, tree target)
5094 struct cgraph_node *fnode = NULL;
5095 struct varpool_node *vnode = NULL;
5097 if (TREE_CODE (decl) == FUNCTION_DECL)
5099 fnode = cgraph_node_for_asm (target);
5101 vnode = varpool_node_for_asm (target);
5105 vnode = varpool_node_for_asm (target);
5107 fnode = cgraph_node_for_asm (target);
5112 /* We can't mark function nodes as used after cgraph global info
5113 is finished. This wouldn't generally be necessary, but C++
5114 virtual table thunks are introduced late in the game and
5115 might seem like they need marking, although in fact they
5117 if (! cgraph_global_info_ready)
5118 cgraph_mark_needed_node (fnode);
5123 varpool_mark_needed_node (vnode);
5130 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5131 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5132 tree node is DECL to have the value of the tree node TARGET. */
5135 do_assemble_alias (tree decl, tree target)
5137 if (TREE_ASM_WRITTEN (decl))
5140 TREE_ASM_WRITTEN (decl) = 1;
5141 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
5143 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5145 ultimate_transparent_alias_target (&target);
5147 if (!targetm.have_tls
5148 && TREE_CODE (decl) == VAR_DECL
5149 && DECL_THREAD_LOCAL_P (decl))
5151 decl = emutls_decl (decl);
5152 target = get_emutls_object_name (target);
5155 if (!TREE_SYMBOL_REFERENCED (target))
5156 weakref_targets = tree_cons (decl, target, weakref_targets);
5158 #ifdef ASM_OUTPUT_WEAKREF
5159 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
5160 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5161 IDENTIFIER_POINTER (target));
5165 error ("%Jweakref is not supported in this configuration", decl);
5172 if (!targetm.have_tls
5173 && TREE_CODE (decl) == VAR_DECL
5174 && DECL_THREAD_LOCAL_P (decl))
5176 decl = emutls_decl (decl);
5177 target = get_emutls_object_name (target);
5180 #ifdef ASM_OUTPUT_DEF
5181 /* Make name accessible from other files, if appropriate. */
5183 if (TREE_PUBLIC (decl))
5185 globalize_decl (decl);
5186 maybe_assemble_visibility (decl);
5189 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5190 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
5192 ASM_OUTPUT_DEF (asm_out_file,
5193 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5194 IDENTIFIER_POINTER (target));
5196 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5201 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5202 # ifdef ASM_WEAKEN_DECL
5203 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
5205 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
5207 /* Remove this function from the pending weak list so that
5208 we do not emit multiple .weak directives for it. */
5209 for (p = &weak_decls; (t = *p) ; )
5210 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5211 *p = TREE_CHAIN (t);
5213 p = &TREE_CHAIN (t);
5215 /* Remove weakrefs to the same target from the pending weakref
5216 list, for the same reason. */
5217 for (p = &weakref_targets; (t = *p) ; )
5219 if (DECL_ASSEMBLER_NAME (decl)
5220 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5221 *p = TREE_CHAIN (t);
5223 p = &TREE_CHAIN (t);
5229 /* First pass of completing pending aliases. Make sure that cgraph knows
5230 which symbols will be required. */
5233 finish_aliases_1 (void)
5238 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5242 target_decl = find_decl_and_mark_needed (p->decl, p->target);
5243 if (target_decl == NULL)
5245 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5246 error ("%q+D aliased to undefined symbol %qs",
5247 p->decl, IDENTIFIER_POINTER (p->target));
5249 else if (DECL_EXTERNAL (target_decl)
5250 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5251 error ("%q+D aliased to external symbol %qs",
5252 p->decl, IDENTIFIER_POINTER (p->target));
5256 /* Second pass of completing pending aliases. Emit the actual assembly.
5257 This happens at the end of compilation and thus it is assured that the
5258 target symbol has been emitted. */
5261 finish_aliases_2 (void)
5266 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); i++)
5267 do_assemble_alias (p->decl, p->target);
5269 VEC_truncate (alias_pair, alias_pairs, 0);
5272 /* Emit an assembler directive to make the symbol for DECL an alias to
5273 the symbol for TARGET. */
5276 assemble_alias (tree decl, tree target)
5279 bool is_weakref = false;
5281 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5283 tree alias = DECL_ASSEMBLER_NAME (decl);
5287 ultimate_transparent_alias_target (&target);
5289 if (alias == target)
5290 error ("weakref %q+D ultimately targets itself", decl);
5293 #ifndef ASM_OUTPUT_WEAKREF
5294 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
5295 TREE_CHAIN (alias) = target;
5298 if (TREE_PUBLIC (decl))
5299 error ("weakref %q+D must have static linkage", decl);
5303 #if !defined (ASM_OUTPUT_DEF)
5304 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5305 error ("%Jalias definitions not supported in this configuration", decl);
5308 if (!DECL_WEAK (decl))
5310 error ("%Jonly weak aliases are supported in this configuration", decl);
5317 /* We must force creation of DECL_RTL for debug info generation, even though
5318 we don't use it here. */
5319 make_decl_rtl (decl);
5320 TREE_USED (decl) = 1;
5322 /* A quirk of the initial implementation of aliases required that the user
5323 add "extern" to all of them. Which is silly, but now historical. Do
5324 note that the symbol is in fact locally defined. */
5326 DECL_EXTERNAL (decl) = 0;
5328 /* Allow aliases to aliases. */
5329 if (TREE_CODE (decl) == FUNCTION_DECL)
5330 cgraph_node (decl)->alias = true;
5332 varpool_node (decl)->alias = true;
5334 /* If the target has already been emitted, we don't have to queue the
5335 alias. This saves a tad o memory. */
5336 target_decl = find_decl_and_mark_needed (decl, target);
5337 if (target_decl && TREE_ASM_WRITTEN (target_decl))
5338 do_assemble_alias (decl, target);
5341 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
5347 /* Emit an assembler directive to set symbol for DECL visibility to
5348 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5351 default_assemble_visibility (tree decl, int vis)
5353 static const char * const visibility_types[] = {
5354 NULL, "protected", "hidden", "internal"
5357 const char *name, *type;
5359 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5360 type = visibility_types[vis];
5362 #ifdef HAVE_GAS_HIDDEN
5363 fprintf (asm_out_file, "\t.%s\t", type);
5364 assemble_name (asm_out_file, name);
5365 fprintf (asm_out_file, "\n");
5367 warning (OPT_Wattributes, "visibility attribute not supported "
5368 "in this configuration; ignored");
5372 /* A helper function to call assemble_visibility when needed for a decl. */
5375 maybe_assemble_visibility (tree decl)
5377 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5379 if (vis != VISIBILITY_DEFAULT)
5381 targetm.asm_out.visibility (decl, vis);
5388 /* Returns 1 if the target configuration supports defining public symbols
5389 so that one of them will be chosen at link time instead of generating a
5390 multiply-defined symbol error, whether through the use of weak symbols or
5391 a target-specific mechanism for having duplicates discarded. */
5394 supports_one_only (void)
5396 if (SUPPORTS_ONE_ONLY)
5398 return SUPPORTS_WEAK;
5401 /* Set up DECL as a public symbol that can be defined in multiple
5402 translation units without generating a linker error. */
5405 make_decl_one_only (tree decl)
5407 gcc_assert (TREE_CODE (decl) == VAR_DECL
5408 || TREE_CODE (decl) == FUNCTION_DECL);
5410 TREE_PUBLIC (decl) = 1;
5412 if (SUPPORTS_ONE_ONLY)
5414 #ifdef MAKE_DECL_ONE_ONLY
5415 MAKE_DECL_ONE_ONLY (decl);
5417 DECL_ONE_ONLY (decl) = 1;
5419 else if (TREE_CODE (decl) == VAR_DECL
5420 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
5421 DECL_COMMON (decl) = 1;
5424 gcc_assert (SUPPORTS_WEAK);
5425 DECL_WEAK (decl) = 1;
5430 init_varasm_once (void)
5432 section_htab = htab_create_ggc (31, section_entry_hash,
5433 section_entry_eq, NULL);
5434 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
5435 object_block_entry_eq, NULL);
5436 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
5437 const_desc_eq, NULL);
5439 const_alias_set = new_alias_set ();
5440 shared_constant_pool = create_constant_pool ();
5442 #ifdef TEXT_SECTION_ASM_OP
5443 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
5444 TEXT_SECTION_ASM_OP);
5447 #ifdef DATA_SECTION_ASM_OP
5448 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5449 DATA_SECTION_ASM_OP);
5452 #ifdef SDATA_SECTION_ASM_OP
5453 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
5454 SDATA_SECTION_ASM_OP);
5457 #ifdef READONLY_DATA_SECTION_ASM_OP
5458 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
5459 READONLY_DATA_SECTION_ASM_OP);
5462 #ifdef CTORS_SECTION_ASM_OP
5463 ctors_section = get_unnamed_section (0, output_section_asm_op,
5464 CTORS_SECTION_ASM_OP);
5467 #ifdef DTORS_SECTION_ASM_OP
5468 dtors_section = get_unnamed_section (0, output_section_asm_op,
5469 DTORS_SECTION_ASM_OP);
5472 #ifdef BSS_SECTION_ASM_OP
5473 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5474 output_section_asm_op,
5475 BSS_SECTION_ASM_OP);
5478 #ifdef SBSS_SECTION_ASM_OP
5479 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
5480 output_section_asm_op,
5481 SBSS_SECTION_ASM_OP);
5484 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5485 | SECTION_COMMON, emit_tls_common);
5486 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5487 | SECTION_COMMON, emit_local);
5488 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
5489 | SECTION_COMMON, emit_common);
5491 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5492 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
5496 targetm.asm_out.init_sections ();
5498 if (readonly_data_section == NULL)
5499 readonly_data_section = text_section;
5503 decl_default_tls_model (tree decl)
5505 enum tls_model kind;
5508 is_local = targetm.binds_local_p (decl);
5512 kind = TLS_MODEL_LOCAL_EXEC;
5514 kind = TLS_MODEL_INITIAL_EXEC;
5517 /* Local dynamic is inefficient when we're not combining the
5518 parts of the address. */
5519 else if (optimize && is_local)
5520 kind = TLS_MODEL_LOCAL_DYNAMIC;
5522 kind = TLS_MODEL_GLOBAL_DYNAMIC;
5523 if (kind < flag_tls_default)
5524 kind = flag_tls_default;
5529 /* Select a set of attributes for section NAME based on the properties
5530 of DECL and whether or not RELOC indicates that DECL's initializer
5531 might contain runtime relocations.
5533 We make the section read-only and executable for a function decl,
5534 read-only for a const data decl, and writable for a non-const data decl. */
5537 default_section_type_flags (tree decl, const char *name, int reloc)
5541 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
5542 flags = SECTION_CODE;
5543 else if (decl && decl_readonly_section (decl, reloc))
5545 else if (current_function_decl
5547 && cfun->unlikely_text_section_name
5548 && strcmp (name, cfun->unlikely_text_section_name) == 0)
5549 flags = SECTION_CODE;
5551 && (!current_function_decl || !cfun)
5552 && strcmp (name, UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
5553 flags = SECTION_CODE;
5555 flags = SECTION_WRITE;
5557 if (decl && DECL_ONE_ONLY (decl))
5558 flags |= SECTION_LINKONCE;
5560 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5561 flags |= SECTION_TLS | SECTION_WRITE;
5563 if (strcmp (name, ".bss") == 0
5564 || strncmp (name, ".bss.", 5) == 0
5565 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
5566 || strcmp (name, ".sbss") == 0
5567 || strncmp (name, ".sbss.", 6) == 0
5568 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
5569 flags |= SECTION_BSS;
5571 if (strcmp (name, ".tdata") == 0
5572 || strncmp (name, ".tdata.", 7) == 0
5573 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
5574 flags |= SECTION_TLS;
5576 if (strcmp (name, ".tbss") == 0
5577 || strncmp (name, ".tbss.", 6) == 0
5578 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
5579 flags |= SECTION_TLS | SECTION_BSS;
5581 /* These three sections have special ELF types. They are neither
5582 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5583 want to print a section type (@progbits or @nobits). If someone
5584 is silly enough to emit code or TLS variables to one of these
5585 sections, then don't handle them specially. */
5586 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
5587 && (strcmp (name, ".init_array") == 0
5588 || strcmp (name, ".fini_array") == 0
5589 || strcmp (name, ".preinit_array") == 0))
5590 flags |= SECTION_NOTYPE;
5595 /* Return true if the target supports some form of global BSS,
5596 either through bss_noswitch_section, or by selecting a BSS
5597 section in TARGET_ASM_SELECT_SECTION. */
5600 have_global_bss_p (void)
5602 return bss_noswitch_section || targetm.have_switchable_bss_sections;
5605 /* Output assembly to switch to section NAME with attribute FLAGS.
5606 Four variants for common object file formats. */
5609 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
5610 unsigned int flags ATTRIBUTE_UNUSED,
5611 tree decl ATTRIBUTE_UNUSED)
5613 /* Some object formats don't support named sections at all. The
5614 front-end should already have flagged this as an error. */
5619 default_elf_asm_named_section (const char *name, unsigned int flags,
5620 tree decl ATTRIBUTE_UNUSED)
5622 char flagchars[10], *f = flagchars;
5624 /* If we have already declared this section, we can use an
5625 abbreviated form to switch back to it -- unless this section is
5626 part of a COMDAT groups, in which case GAS requires the full
5627 declaration every time. */
5628 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5629 && (flags & SECTION_DECLARED))
5631 fprintf (asm_out_file, "\t.section\t%s\n", name);
5635 if (!(flags & SECTION_DEBUG))
5637 if (flags & SECTION_WRITE)
5639 if (flags & SECTION_CODE)
5641 if (flags & SECTION_SMALL)
5643 if (flags & SECTION_MERGE)
5645 if (flags & SECTION_STRINGS)
5647 if (flags & SECTION_TLS)
5649 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5653 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
5655 if (!(flags & SECTION_NOTYPE))
5660 if (flags & SECTION_BSS)
5666 #ifdef ASM_COMMENT_START
5667 /* On platforms that use "@" as the assembly comment character,
5669 if (strcmp (ASM_COMMENT_START, "@") == 0)
5672 fprintf (asm_out_file, format, type);
5674 if (flags & SECTION_ENTSIZE)
5675 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
5676 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
5677 fprintf (asm_out_file, ",%s,comdat",
5678 lang_hooks.decls.comdat_group (decl));
5681 putc ('\n', asm_out_file);
5685 default_coff_asm_named_section (const char *name, unsigned int flags,
5686 tree decl ATTRIBUTE_UNUSED)
5688 char flagchars[8], *f = flagchars;
5690 if (flags & SECTION_WRITE)
5692 if (flags & SECTION_CODE)
5696 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
5700 default_pe_asm_named_section (const char *name, unsigned int flags,
5703 default_coff_asm_named_section (name, flags, decl);
5705 if (flags & SECTION_LINKONCE)
5707 /* Functions may have been compiled at various levels of
5708 optimization so we can't use `same_size' here.
5709 Instead, have the linker pick one. */
5710 fprintf (asm_out_file, "\t.linkonce %s\n",
5711 (flags & SECTION_CODE ? "discard" : "same_size"));
5715 /* The lame default section selector. */
5718 default_select_section (tree decl, int reloc,
5719 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
5723 if (decl_readonly_section (decl, reloc))
5724 return readonly_data_section;
5726 else if (TREE_CODE (decl) == CONSTRUCTOR)
5728 if (! ((flag_pic && reloc)
5729 || !TREE_READONLY (decl)
5730 || TREE_SIDE_EFFECTS (decl)
5731 || !TREE_CONSTANT (decl)))
5732 return readonly_data_section;
5734 else if (TREE_CODE (decl) == STRING_CST)
5735 return readonly_data_section;
5736 else if (! (flag_pic && reloc))
5737 return readonly_data_section;
5739 return data_section;
5742 enum section_category
5743 categorize_decl_for_section (tree decl, int reloc)
5745 enum section_category ret;
5747 if (TREE_CODE (decl) == FUNCTION_DECL)
5749 else if (TREE_CODE (decl) == STRING_CST)
5751 if (flag_mudflap) /* or !flag_merge_constants */
5752 return SECCAT_RODATA;
5754 return SECCAT_RODATA_MERGE_STR;
5756 else if (TREE_CODE (decl) == VAR_DECL)
5758 if (bss_initializer_p (decl))
5760 else if (! TREE_READONLY (decl)
5761 || TREE_SIDE_EFFECTS (decl)
5762 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
5764 /* Here the reloc_rw_mask is not testing whether the section should
5765 be read-only or not, but whether the dynamic link will have to
5766 do something. If so, we wish to segregate the data in order to
5767 minimize cache misses inside the dynamic linker. */
5768 if (reloc & targetm.asm_out.reloc_rw_mask ())
5769 ret = reloc == 1 ? SECCAT_DATA_REL_LOCAL : SECCAT_DATA_REL;
5773 else if (reloc & targetm.asm_out.reloc_rw_mask ())
5774 ret = reloc == 1 ? SECCAT_DATA_REL_RO_LOCAL : SECCAT_DATA_REL_RO;
5775 else if (reloc || flag_merge_constants < 2)
5776 /* C and C++ don't allow different variables to share the same
5777 location. -fmerge-all-constants allows even that (at the
5778 expense of not conforming). */
5779 ret = SECCAT_RODATA;
5780 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
5781 ret = SECCAT_RODATA_MERGE_STR_INIT;
5783 ret = SECCAT_RODATA_MERGE_CONST;
5785 else if (TREE_CODE (decl) == CONSTRUCTOR)
5787 if ((reloc & targetm.asm_out.reloc_rw_mask ())
5788 || TREE_SIDE_EFFECTS (decl)
5789 || ! TREE_CONSTANT (decl))
5792 ret = SECCAT_RODATA;
5795 ret = SECCAT_RODATA;
5797 /* There are no read-only thread-local sections. */
5798 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
5800 /* Note that this would be *just* SECCAT_BSS, except that there's
5801 no concept of a read-only thread-local-data section. */
5802 if (ret == SECCAT_BSS
5803 || (flag_zero_initialized_in_bss
5804 && initializer_zerop (DECL_INITIAL (decl))))
5810 /* If the target uses small data sections, select it. */
5811 else if (targetm.in_small_data_p (decl))
5813 if (ret == SECCAT_BSS)
5815 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
5816 ret = SECCAT_SRODATA;
5825 decl_readonly_section (tree decl, int reloc)
5827 switch (categorize_decl_for_section (decl, reloc))
5830 case SECCAT_RODATA_MERGE_STR:
5831 case SECCAT_RODATA_MERGE_STR_INIT:
5832 case SECCAT_RODATA_MERGE_CONST:
5833 case SECCAT_SRODATA:
5842 /* Select a section based on the above categorization. */
5845 default_elf_select_section (tree decl, int reloc,
5846 unsigned HOST_WIDE_INT align)
5849 switch (categorize_decl_for_section (decl, reloc))
5852 /* We're not supposed to be called on FUNCTION_DECLs. */
5855 return readonly_data_section;
5856 case SECCAT_RODATA_MERGE_STR:
5857 return mergeable_string_section (decl, align, 0);
5858 case SECCAT_RODATA_MERGE_STR_INIT:
5859 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
5860 case SECCAT_RODATA_MERGE_CONST:
5861 return mergeable_constant_section (DECL_MODE (decl), align, 0);
5862 case SECCAT_SRODATA:
5866 return data_section;
5867 case SECCAT_DATA_REL:
5868 sname = ".data.rel";
5870 case SECCAT_DATA_REL_LOCAL:
5871 sname = ".data.rel.local";
5873 case SECCAT_DATA_REL_RO:
5874 sname = ".data.rel.ro";
5876 case SECCAT_DATA_REL_RO_LOCAL:
5877 sname = ".data.rel.ro.local";
5902 return get_named_section (decl, sname, reloc);
5905 /* Construct a unique section name based on the decl name and the
5906 categorization performed above. */
5909 default_unique_section (tree decl, int reloc)
5911 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
5912 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
5913 const char *prefix, *name;
5917 switch (categorize_decl_for_section (decl, reloc))
5920 prefix = one_only ? ".gnu.linkonce.t." : ".text.";
5923 case SECCAT_RODATA_MERGE_STR:
5924 case SECCAT_RODATA_MERGE_STR_INIT:
5925 case SECCAT_RODATA_MERGE_CONST:
5926 prefix = one_only ? ".gnu.linkonce.r." : ".rodata.";
5928 case SECCAT_SRODATA:
5929 prefix = one_only ? ".gnu.linkonce.s2." : ".sdata2.";
5932 prefix = one_only ? ".gnu.linkonce.d." : ".data.";
5934 case SECCAT_DATA_REL:
5935 prefix = one_only ? ".gnu.linkonce.d.rel." : ".data.rel.";
5937 case SECCAT_DATA_REL_LOCAL:
5938 prefix = one_only ? ".gnu.linkonce.d.rel.local." : ".data.rel.local.";
5940 case SECCAT_DATA_REL_RO:
5941 prefix = one_only ? ".gnu.linkonce.d.rel.ro." : ".data.rel.ro.";
5943 case SECCAT_DATA_REL_RO_LOCAL:
5944 prefix = one_only ? ".gnu.linkonce.d.rel.ro.local."
5945 : ".data.rel.ro.local.";
5948 prefix = one_only ? ".gnu.linkonce.s." : ".sdata.";
5951 prefix = one_only ? ".gnu.linkonce.b." : ".bss.";
5954 prefix = one_only ? ".gnu.linkonce.sb." : ".sbss.";
5957 prefix = one_only ? ".gnu.linkonce.td." : ".tdata.";
5960 prefix = one_only ? ".gnu.linkonce.tb." : ".tbss.";
5965 plen = strlen (prefix);
5967 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5968 name = targetm.strip_name_encoding (name);
5969 nlen = strlen (name);
5971 string = alloca (nlen + plen + 1);
5972 memcpy (string, prefix, plen);
5973 memcpy (string + plen, name, nlen + 1);
5975 DECL_SECTION_NAME (decl) = build_string (nlen + plen, string);
5978 /* Like compute_reloc_for_constant, except for an RTX. The return value
5979 is a mask for which bit 1 indicates a global relocation, and bit 0
5980 indicates a local relocation. */
5983 compute_reloc_for_rtx_1 (rtx *xp, void *data)
5988 switch (GET_CODE (x))
5991 *preloc |= SYMBOL_REF_LOCAL_P (x) ? 1 : 2;
6004 compute_reloc_for_rtx (rtx x)
6008 switch (GET_CODE (x))
6014 for_each_rtx (&x, compute_reloc_for_rtx_1, &reloc);
6023 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
6025 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6027 if (compute_reloc_for_rtx (x) & targetm.asm_out.reloc_rw_mask ())
6028 return data_section;
6030 return readonly_data_section;
6034 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
6035 unsigned HOST_WIDE_INT align)
6037 int reloc = compute_reloc_for_rtx (x);
6039 /* ??? Handle small data here somehow. */
6041 if (reloc & targetm.asm_out.reloc_rw_mask ())
6044 return get_named_section (NULL, ".data.rel.ro.local", 1);
6046 return get_named_section (NULL, ".data.rel.ro", 3);
6049 return mergeable_constant_section (mode, align, 0);
6052 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6055 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
6060 /* Careful not to prod global register variables. */
6063 symbol = XEXP (rtl, 0);
6064 if (GET_CODE (symbol) != SYMBOL_REF)
6067 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
6068 if (TREE_CODE (decl) == FUNCTION_DECL)
6069 flags |= SYMBOL_FLAG_FUNCTION;
6070 if (targetm.binds_local_p (decl))
6071 flags |= SYMBOL_FLAG_LOCAL;
6072 if (targetm.have_tls && TREE_CODE (decl) == VAR_DECL
6073 && DECL_THREAD_LOCAL_P (decl))
6074 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
6075 else if (targetm.in_small_data_p (decl))
6076 flags |= SYMBOL_FLAG_SMALL;
6077 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6078 being PUBLIC, the thing *must* be defined in this translation unit.
6079 Prevent this buglet from being propagated into rtl code as well. */
6080 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
6081 flags |= SYMBOL_FLAG_EXTERNAL;
6083 SYMBOL_REF_FLAGS (symbol) = flags;
6086 /* By default, we do nothing for encode_section_info, so we need not
6087 do anything but discard the '*' marker. */
6090 default_strip_name_encoding (const char *str)
6092 return str + (*str == '*');
6095 #ifdef ASM_OUTPUT_DEF
6096 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6097 anchor relative to ".", the current section position. */
6100 default_asm_output_anchor (rtx symbol)
6104 sprintf (buffer, "*. + " HOST_WIDE_INT_PRINT_DEC,
6105 SYMBOL_REF_BLOCK_OFFSET (symbol));
6106 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
6110 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6113 default_use_anchors_for_symbol_p (rtx symbol)
6118 /* Don't use anchors for mergeable sections. The linker might move
6119 the objects around. */
6120 sect = SYMBOL_REF_BLOCK (symbol)->sect;
6121 if (sect->common.flags & SECTION_MERGE)
6124 /* Don't use anchors for small data sections. The small data register
6125 acts as an anchor for such sections. */
6126 if (sect->common.flags & SECTION_SMALL)
6129 decl = SYMBOL_REF_DECL (symbol);
6130 if (decl && DECL_P (decl))
6132 /* Don't use section anchors for decls that might be defined by
6134 if (!targetm.binds_local_p (decl))
6137 /* Don't use section anchors for decls that will be placed in a
6138 small data section. */
6139 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6140 one above. The problem is that we only use SECTION_SMALL for
6141 sections that should be marked as small in the section directive. */
6142 if (targetm.in_small_data_p (decl))
6148 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6149 wrt cross-module name binding. */
6152 default_binds_local_p (tree exp)
6154 return default_binds_local_p_1 (exp, flag_shlib);
6158 default_binds_local_p_1 (tree exp, int shlib)
6162 /* A non-decl is an entry in the constant pool. */
6165 /* Weakrefs may not bind locally, even though the weakref itself is
6166 always static and therefore local. */
6167 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp)))
6169 /* Static variables are always local. */
6170 else if (! TREE_PUBLIC (exp))
6172 /* A variable is local if the user has said explicitly that it will
6174 else if (DECL_VISIBILITY_SPECIFIED (exp)
6175 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6177 /* Variables defined outside this object might not be local. */
6178 else if (DECL_EXTERNAL (exp))
6180 /* If defined in this object and visibility is not default, must be
6182 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6184 /* Default visibility weak data can be overridden by a strong symbol
6185 in another module and so are not local. */
6186 else if (DECL_WEAK (exp))
6188 /* If PIC, then assume that any global name can be overridden by
6189 symbols resolved from other modules. */
6192 /* Uninitialized COMMON variable may be unified with symbols
6193 resolved from other modules. */
6194 else if (DECL_COMMON (exp)
6195 && (DECL_INITIAL (exp) == NULL
6196 || DECL_INITIAL (exp) == error_mark_node))
6198 /* Otherwise we're left with initialized (or non-common) global data
6199 which is of necessity defined locally. */
6206 /* Determine whether or not a pointer mode is valid. Assume defaults
6207 of ptr_mode or Pmode - can be overridden. */
6209 default_valid_pointer_mode (enum machine_mode mode)
6211 return (mode == ptr_mode || mode == Pmode);
6214 /* Default function to output code that will globalize a label. A
6215 target must define GLOBAL_ASM_OP or provide its own function to
6216 globalize a label. */
6217 #ifdef GLOBAL_ASM_OP
6219 default_globalize_label (FILE * stream, const char *name)
6221 fputs (GLOBAL_ASM_OP, stream);
6222 assemble_name (stream, name);
6223 putc ('\n', stream);
6225 #endif /* GLOBAL_ASM_OP */
6227 /* Default function to output code that will globalize a declaration. */
6229 default_globalize_decl_name (FILE * stream, tree decl)
6231 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
6232 targetm.asm_out.globalize_label (stream, name);
6235 /* Default function to output a label for unwind information. The
6236 default is to do nothing. A target that needs nonlocal labels for
6237 unwind information must provide its own function to do this. */
6239 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
6240 tree decl ATTRIBUTE_UNUSED,
6241 int for_eh ATTRIBUTE_UNUSED,
6242 int empty ATTRIBUTE_UNUSED)
6246 /* Default function to output a label to divide up the exception table.
6247 The default is to do nothing. A target that needs/wants to divide
6248 up the table must provide it's own function to do this. */
6250 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
6254 /* This is how to output an internal numbered label where PREFIX is
6255 the class of label and LABELNO is the number within the class. */
6258 default_internal_label (FILE *stream, const char *prefix,
6259 unsigned long labelno)
6261 char *const buf = alloca (40 + strlen (prefix));
6262 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
6263 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
6266 /* This is the default behavior at the beginning of a file. It's
6267 controlled by two other target-hook toggles. */
6269 default_file_start (void)
6271 if (targetm.file_start_app_off && !flag_verbose_asm)
6272 fputs (ASM_APP_OFF, asm_out_file);
6274 if (targetm.file_start_file_directive)
6275 output_file_directive (asm_out_file, main_input_filename);
6278 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6279 which emits a special section directive used to indicate whether or
6280 not this object file needs an executable stack. This is primarily
6281 a GNU extension to ELF but could be used on other targets. */
6283 int trampolines_created;
6286 file_end_indicate_exec_stack (void)
6288 unsigned int flags = SECTION_DEBUG;
6289 if (trampolines_created)
6290 flags |= SECTION_CODE;
6292 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
6295 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6296 a get_unnamed_section callback. */
6299 output_section_asm_op (const void *directive)
6301 fprintf (asm_out_file, "%s\n", (const char *) directive);
6304 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6305 the current section is NEW_SECTION. */
6308 switch_to_section (section *new_section)
6310 if (in_section == new_section)
6313 if (new_section->common.flags & SECTION_FORGET)
6316 in_section = new_section;
6318 switch (SECTION_STYLE (new_section))
6322 && !cfun->unlikely_text_section_name
6323 && strcmp (new_section->named.name,
6324 UNLIKELY_EXECUTED_TEXT_SECTION_NAME) == 0)
6325 cfun->unlikely_text_section_name = UNLIKELY_EXECUTED_TEXT_SECTION_NAME;
6327 targetm.asm_out.named_section (new_section->named.name,
6328 new_section->named.common.flags,
6329 new_section->named.decl);
6332 case SECTION_UNNAMED:
6333 new_section->unnamed.callback (new_section->unnamed.data);
6336 case SECTION_NOSWITCH:
6341 new_section->common.flags |= SECTION_DECLARED;
6344 /* If block symbol SYMBOL has not yet been assigned an offset, place
6345 it at the end of its block. */
6348 place_block_symbol (rtx symbol)
6350 unsigned HOST_WIDE_INT size, mask, offset;
6351 struct constant_descriptor_rtx *desc;
6352 unsigned int alignment;
6353 struct object_block *block;
6356 gcc_assert (SYMBOL_REF_BLOCK (symbol));
6357 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
6360 /* Work out the symbol's size and alignment. */
6361 if (CONSTANT_POOL_ADDRESS_P (symbol))
6363 desc = SYMBOL_REF_CONSTANT (symbol);
6364 alignment = desc->align;
6365 size = GET_MODE_SIZE (desc->mode);
6367 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6369 decl = SYMBOL_REF_DECL (symbol);
6370 alignment = get_constant_alignment (decl);
6371 size = get_constant_size (decl);
6375 decl = SYMBOL_REF_DECL (symbol);
6376 alignment = DECL_ALIGN (decl);
6377 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6380 /* Calculate the object's offset from the start of the block. */
6381 block = SYMBOL_REF_BLOCK (symbol);
6382 mask = alignment / BITS_PER_UNIT - 1;
6383 offset = (block->size + mask) & ~mask;
6384 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
6386 /* Record the block's new alignment and size. */
6387 block->alignment = MAX (block->alignment, alignment);
6388 block->size = offset + size;
6390 VEC_safe_push (rtx, gc, block->objects, symbol);
6393 /* Return the anchor that should be used to address byte offset OFFSET
6394 from the first object in BLOCK. MODEL is the TLS model used
6398 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
6399 enum tls_model model)
6402 unsigned int begin, middle, end;
6403 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
6406 /* Work out the anchor's offset. Use an offset of 0 for the first
6407 anchor so that we don't pessimize the case where we take the address
6408 of a variable at the beginning of the block. This is particularly
6409 useful when a block has only one variable assigned to it.
6411 We try to place anchors RANGE bytes apart, so there can then be
6412 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6413 a ptr_mode offset. With some target settings, the lowest such
6414 anchor might be out of range for the lowest ptr_mode offset;
6415 likewise the highest anchor for the highest offset. Use anchors
6416 at the extreme ends of the ptr_mode range in such cases.
6418 All arithmetic uses unsigned integers in order to avoid
6420 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
6421 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
6422 range = max_offset - min_offset + 1;
6427 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
6430 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
6431 delta -= delta % range;
6434 offset = (HOST_WIDE_INT) (-delta);
6438 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
6439 delta -= delta % range;
6440 if (delta > bias - 1)
6442 offset = (HOST_WIDE_INT) delta;
6446 /* Do a binary search to see if there's already an anchor we can use.
6447 Set BEGIN to the new anchor's index if not. */
6449 end = VEC_length (rtx, block->anchors);
6450 while (begin != end)
6452 middle = (end + begin) / 2;
6453 anchor = VEC_index (rtx, block->anchors, middle);
6454 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
6456 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
6458 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
6460 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
6466 /* Create a new anchor with a unique label. */
6467 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
6468 anchor = create_block_symbol (ggc_strdup (label), block, offset);
6469 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
6470 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
6472 /* Insert it at index BEGIN. */
6473 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
6477 /* Output the objects in BLOCK. */
6480 output_object_block (struct object_block *block)
6482 struct constant_descriptor_rtx *desc;
6484 HOST_WIDE_INT offset;
6488 if (block->objects == NULL)
6491 /* Switch to the section and make sure that the first byte is
6492 suitably aligned. */
6493 switch_to_section (block->sect);
6494 assemble_align (block->alignment);
6496 /* Define the values of all anchors relative to the current section
6498 for (i = 0; VEC_iterate (rtx, block->anchors, i, symbol); i++)
6499 targetm.asm_out.output_anchor (symbol);
6501 /* Output the objects themselves. */
6503 for (i = 0; VEC_iterate (rtx, block->objects, i, symbol); i++)
6505 /* Move to the object's offset, padding with zeros if necessary. */
6506 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
6507 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
6508 if (CONSTANT_POOL_ADDRESS_P (symbol))
6510 desc = SYMBOL_REF_CONSTANT (symbol);
6511 output_constant_pool_1 (desc, 1);
6512 offset += GET_MODE_SIZE (desc->mode);
6514 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
6516 decl = SYMBOL_REF_DECL (symbol);
6517 assemble_constant_contents (decl, XSTR (symbol, 0),
6518 get_constant_alignment (decl));
6519 offset += get_constant_size (decl);
6523 decl = SYMBOL_REF_DECL (symbol);
6524 assemble_variable_contents (decl, XSTR (symbol, 0), false);
6525 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
6530 /* A htab_traverse callback used to call output_object_block for
6531 each member of object_block_htab. */
6534 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
6536 output_object_block ((struct object_block *) (*slot));
6540 /* Output the definitions of all object_blocks. */
6543 output_object_blocks (void)
6545 htab_traverse (object_block_htab, output_object_block_htab, NULL);
6548 /* This function provides a possible implementation of the
6549 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
6550 by -frecord-gcc-switches it creates a new mergeable, string section in the
6551 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
6552 contains the switches in ASCII format.
6554 FIXME: This code does not correctly handle double quote characters
6555 that appear inside strings, (it strips them rather than preserving them).
6556 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
6557 characters - instead it treats them as sub-string separators. Since
6558 we want to emit NUL strings terminators into the object file we have to use
6562 elf_record_gcc_switches (print_switch_type type, const char * name)
6564 static char buffer[1024];
6566 /* This variable is used as part of a simplistic heuristic to detect
6567 command line switches which take an argument:
6569 "If a command line option does not start with a dash then
6570 it is an argument for the previous command line option."
6572 This fails in the case of the command line option which is the name
6573 of the file to compile, but otherwise it is pretty reasonable. */
6574 static bool previous_name_held_back = FALSE;
6578 case SWITCH_TYPE_PASSED:
6581 if (previous_name_held_back)
6583 unsigned int len = strlen (buffer);
6585 snprintf (buffer + len, sizeof buffer - len, " %s", name);
6586 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6587 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6588 previous_name_held_back = FALSE;
6592 strncpy (buffer, name, sizeof buffer);
6593 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6594 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6599 if (previous_name_held_back)
6601 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6602 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6605 strncpy (buffer, name, sizeof buffer);
6606 previous_name_held_back = TRUE;
6610 case SWITCH_TYPE_DESCRIPTIVE:
6613 /* Distinguish between invocations where name is NULL. */
6614 static bool started = false;
6618 if (previous_name_held_back)
6620 ASM_OUTPUT_ASCII (asm_out_file, buffer, strlen (buffer));
6621 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
6628 sec = get_section (targetm.asm_out.record_gcc_switches_section,
6632 | (SECTION_ENTSIZE & 1),
6634 switch_to_section (sec);
6643 /* The return value is currently ignored by the caller, but must be 0.
6644 For -fverbose-asm the return value would be the number of characters
6645 emitted into the assembler file. */
6649 /* Emit text to declare externally defined symbols. It is needed to
6650 properly support non-default visibility. */
6652 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED,
6654 const char *name ATTRIBUTE_UNUSED)
6656 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
6657 set in order to avoid putting out names that are never really
6659 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
6660 && targetm.binds_local_p (decl))
6661 maybe_assemble_visibility (decl);
6664 #include "gt-varasm.h"