1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 2010, 2011, 2012 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* This file handles generation of all the assembler code
24 *except* the instructions of a function.
25 This includes declarations of variables and their initial values.
27 We also output the assembler code for constants stored in memory
28 and are responsible for combining constants with the same value. */
32 #include "coretypes.h"
33 #include "pointer-set.h"
40 #include "hard-reg-set.h"
43 #include "diagnostic-core.h"
46 #include "langhooks.h"
50 #include "targhooks.h"
51 #include "tree-mudflap.h"
53 #include "cfglayout.h"
54 #include "basic-block.h"
55 #include "tree-iterator.h"
56 #include "pointer-set.h"
58 #ifdef XCOFF_DEBUGGING_INFO
59 #include "xcoffout.h" /* Needed for external data
60 declarations for e.g. AIX 4.x. */
63 /* The (assembler) name of the first globally-visible object output. */
64 extern GTY(()) const char *first_global_object_name;
65 extern GTY(()) const char *weak_global_object_name;
67 const char *first_global_object_name;
68 const char *weak_global_object_name;
71 struct constant_descriptor_rtx;
72 struct rtx_constant_pool;
74 #define n_deferred_constants (crtl->varasm.deferred_constants)
76 /* Number for making the label on the next
77 constant that is stored in memory. */
79 static GTY(()) int const_labelno;
81 /* Carry information from ASM_DECLARE_OBJECT_NAME
82 to ASM_FINISH_DECLARE_OBJECT. */
84 int size_directive_output;
86 /* The last decl for which assemble_variable was called,
87 if it did ASM_DECLARE_OBJECT_NAME.
88 If the last call to assemble_variable didn't do that,
91 tree last_assemble_variable_decl;
93 /* The following global variable indicates if the first basic block
94 in a function belongs to the cold partition or not. */
96 bool first_function_block_is_cold;
98 /* We give all constants their own alias set. Perhaps redundant with
99 MEM_READONLY_P, but pre-dates it. */
101 static alias_set_type const_alias_set;
103 /* Whether we saw any functions with no_split_stack. */
105 static bool saw_no_split_stack;
107 static const char *strip_reg_name (const char *);
108 static int contains_pointers_p (tree);
109 #ifdef ASM_OUTPUT_EXTERNAL
110 static bool incorporeal_function_p (tree);
112 static void decode_addr_const (tree, struct addr_const *);
113 static hashval_t const_desc_hash (const void *);
114 static int const_desc_eq (const void *, const void *);
115 static hashval_t const_hash_1 (const tree);
116 static int compare_constant (const tree, const tree);
117 static tree copy_constant (tree);
118 static void output_constant_def_contents (rtx);
119 static void output_addressed_constants (tree);
120 static unsigned HOST_WIDE_INT array_size_for_constructor (tree);
121 static unsigned min_align (unsigned, unsigned);
122 static void globalize_decl (tree);
123 static bool decl_readonly_section_1 (enum section_category);
124 #ifdef BSS_SECTION_ASM_OP
125 #ifdef ASM_OUTPUT_BSS
126 static void asm_output_bss (FILE *, tree, const char *,
127 unsigned HOST_WIDE_INT, unsigned HOST_WIDE_INT);
129 #ifdef ASM_OUTPUT_ALIGNED_BSS
130 static void asm_output_aligned_bss (FILE *, tree, const char *,
131 unsigned HOST_WIDE_INT, int)
134 #endif /* BSS_SECTION_ASM_OP */
135 static void mark_weak (tree);
136 static void output_constant_pool (const char *, tree);
138 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
139 section *text_section;
140 section *data_section;
141 section *readonly_data_section;
142 section *sdata_section;
143 section *ctors_section;
144 section *dtors_section;
145 section *bss_section;
146 section *sbss_section;
148 /* Various forms of common section. All are guaranteed to be nonnull. */
149 section *tls_comm_section;
150 section *comm_section;
151 section *lcomm_section;
153 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
155 section *bss_noswitch_section;
157 /* The section that holds the main exception table, when known. The section
158 is set either by the target's init_sections hook or by the first call to
159 switch_to_exception_section. */
160 section *exception_section;
162 /* The section that holds the DWARF2 frame unwind information, when known.
163 The section is set either by the target's init_sections hook or by the
164 first call to switch_to_eh_frame_section. */
165 section *eh_frame_section;
167 /* asm_out_file's current section. This is NULL if no section has yet
168 been selected or if we lose track of what the current section is. */
171 /* True if code for the current function is currently being directed
172 at the cold section. */
173 bool in_cold_section_p;
175 /* A linked list of all the unnamed sections. */
176 static GTY(()) section *unnamed_sections;
178 /* Return a nonzero value if DECL has a section attribute. */
179 #define IN_NAMED_SECTION(DECL) \
180 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
181 && DECL_SECTION_NAME (DECL) != NULL_TREE)
183 /* Hash table of named sections. */
184 static GTY((param_is (section))) htab_t section_htab;
186 /* A table of object_blocks, indexed by section. */
187 static GTY((param_is (struct object_block))) htab_t object_block_htab;
189 /* The next number to use for internal anchor labels. */
190 static GTY(()) int anchor_labelno;
192 /* A pool of constants that can be shared between functions. */
193 static GTY(()) struct rtx_constant_pool *shared_constant_pool;
195 /* Helper routines for maintaining section_htab. */
198 section_entry_eq (const void *p1, const void *p2)
200 const section *old = (const section *) p1;
201 const char *new_name = (const char *) p2;
203 return strcmp (old->named.name, new_name) == 0;
207 section_entry_hash (const void *p)
209 const section *old = (const section *) p;
210 return htab_hash_string (old->named.name);
213 /* Return a hash value for section SECT. */
216 hash_section (section *sect)
218 if (sect->common.flags & SECTION_NAMED)
219 return htab_hash_string (sect->named.name);
220 return sect->common.flags;
223 /* Helper routines for maintaining object_block_htab. */
226 object_block_entry_eq (const void *p1, const void *p2)
228 const struct object_block *old = (const struct object_block *) p1;
229 const section *new_section = (const section *) p2;
231 return old->sect == new_section;
235 object_block_entry_hash (const void *p)
237 const struct object_block *old = (const struct object_block *) p;
238 return hash_section (old->sect);
241 /* Return a new unnamed section with the given fields. */
244 get_unnamed_section (unsigned int flags, void (*callback) (const void *),
249 sect = ggc_alloc_section ();
250 sect->unnamed.common.flags = flags | SECTION_UNNAMED;
251 sect->unnamed.callback = callback;
252 sect->unnamed.data = data;
253 sect->unnamed.next = unnamed_sections;
255 unnamed_sections = sect;
259 /* Return a SECTION_NOSWITCH section with the given fields. */
262 get_noswitch_section (unsigned int flags, noswitch_section_callback callback)
266 sect = ggc_alloc_section ();
267 sect->noswitch.common.flags = flags | SECTION_NOSWITCH;
268 sect->noswitch.callback = callback;
273 /* Return the named section structure associated with NAME. Create
274 a new section with the given fields if no such structure exists. */
277 get_section (const char *name, unsigned int flags, tree decl)
279 section *sect, **slot;
282 htab_find_slot_with_hash (section_htab, name,
283 htab_hash_string (name), INSERT);
284 flags |= SECTION_NAMED;
287 sect = ggc_alloc_section ();
288 sect->named.common.flags = flags;
289 sect->named.name = ggc_strdup (name);
290 sect->named.decl = decl;
296 if ((sect->common.flags & ~SECTION_DECLARED) != flags
297 && ((sect->common.flags | flags) & SECTION_OVERRIDE) == 0)
299 /* It is fine if one of the section flags is
300 SECTION_WRITE | SECTION_RELRO and the other has none of these
301 flags (i.e. read-only) in named sections and either the
302 section hasn't been declared yet or has been declared as writable.
303 In that case just make sure the resulting flags are
304 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
306 if (((sect->common.flags ^ flags) & (SECTION_WRITE | SECTION_RELRO))
307 == (SECTION_WRITE | SECTION_RELRO)
308 && (sect->common.flags
309 & ~(SECTION_DECLARED | SECTION_WRITE | SECTION_RELRO))
310 == (flags & ~(SECTION_WRITE | SECTION_RELRO))
311 && ((sect->common.flags & SECTION_DECLARED) == 0
312 || (sect->common.flags & SECTION_WRITE)))
314 sect->common.flags |= (SECTION_WRITE | SECTION_RELRO);
317 /* Sanity check user variables for flag changes. */
319 decl = sect->named.decl;
321 error ("%+D causes a section type conflict", decl);
322 /* Make sure we don't error about one section multiple times. */
323 sect->common.flags |= SECTION_OVERRIDE;
329 /* Return true if the current compilation mode benefits from having
330 objects grouped into blocks. */
333 use_object_blocks_p (void)
335 return flag_section_anchors;
338 /* Return the object_block structure for section SECT. Create a new
339 structure if we haven't created one already. Return null if SECT
342 static struct object_block *
343 get_block_for_section (section *sect)
345 struct object_block *block;
351 slot = htab_find_slot_with_hash (object_block_htab, sect,
352 hash_section (sect), INSERT);
353 block = (struct object_block *) *slot;
356 block = ggc_alloc_cleared_object_block ();
363 /* Create a symbol with label LABEL and place it at byte offset
364 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
365 is not yet known. LABEL must be a garbage-collected string. */
368 create_block_symbol (const char *label, struct object_block *block,
369 HOST_WIDE_INT offset)
374 /* Create the extended SYMBOL_REF. */
375 size = RTX_HDR_SIZE + sizeof (struct block_symbol);
376 symbol = ggc_alloc_zone_rtx_def (size, &rtl_zone);
378 /* Initialize the normal SYMBOL_REF fields. */
379 memset (symbol, 0, size);
380 PUT_CODE (symbol, SYMBOL_REF);
381 PUT_MODE (symbol, Pmode);
382 XSTR (symbol, 0) = label;
383 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_HAS_BLOCK_INFO;
385 /* Initialize the block_symbol stuff. */
386 SYMBOL_REF_BLOCK (symbol) = block;
387 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
392 /* Return a section with a particular name and with whatever SECTION_*
393 flags section_type_flags deems appropriate. The name of the section
394 is taken from NAME if nonnull, otherwise it is taken from DECL's
395 DECL_SECTION_NAME. DECL is the decl associated with the section
396 (see the section comment for details) and RELOC is as for
397 section_type_flags. */
400 get_named_section (tree decl, const char *name, int reloc)
404 gcc_assert (!decl || DECL_P (decl));
406 name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
408 flags = targetm.section_type_flags (decl, name, reloc);
410 return get_section (name, flags, decl);
413 /* If required, set DECL_SECTION_NAME to a unique name. */
416 resolve_unique_section (tree decl, int reloc ATTRIBUTE_UNUSED,
417 int flag_function_or_data_sections)
419 if (DECL_SECTION_NAME (decl) == NULL_TREE
420 && targetm.have_named_sections
421 && (flag_function_or_data_sections
422 || DECL_ONE_ONLY (decl)))
424 targetm.asm_out.unique_section (decl, reloc);
425 DECL_HAS_IMPLICIT_SECTION_NAME_P (decl) = true;
429 #ifdef BSS_SECTION_ASM_OP
431 #ifdef ASM_OUTPUT_BSS
433 /* Utility function for ASM_OUTPUT_BSS for targets to use if
434 they don't support alignments in .bss.
435 ??? It is believed that this function will work in most cases so such
436 support is localized here. */
438 static void ATTRIBUTE_UNUSED
439 asm_output_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
441 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
442 unsigned HOST_WIDE_INT rounded)
444 gcc_assert (strcmp (XSTR (XEXP (DECL_RTL (decl), 0), 0), name) == 0);
445 targetm.asm_out.globalize_decl_name (file, decl);
446 switch_to_section (bss_section);
447 #ifdef ASM_DECLARE_OBJECT_NAME
448 last_assemble_variable_decl = decl;
449 ASM_DECLARE_OBJECT_NAME (file, name, decl);
451 /* Standard thing is just output label for the object. */
452 ASM_OUTPUT_LABEL (file, name);
453 #endif /* ASM_DECLARE_OBJECT_NAME */
454 ASM_OUTPUT_SKIP (file, rounded ? rounded : 1);
459 #ifdef ASM_OUTPUT_ALIGNED_BSS
461 /* Utility function for targets to use in implementing
462 ASM_OUTPUT_ALIGNED_BSS.
463 ??? It is believed that this function will work in most cases so such
464 support is localized here. */
467 asm_output_aligned_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
468 const char *name, unsigned HOST_WIDE_INT size,
471 switch_to_section (bss_section);
472 ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
473 #ifdef ASM_DECLARE_OBJECT_NAME
474 last_assemble_variable_decl = decl;
475 ASM_DECLARE_OBJECT_NAME (file, name, decl);
477 /* Standard thing is just output label for the object. */
478 ASM_OUTPUT_LABEL (file, name);
479 #endif /* ASM_DECLARE_OBJECT_NAME */
480 ASM_OUTPUT_SKIP (file, size ? size : 1);
485 #endif /* BSS_SECTION_ASM_OP */
487 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
488 /* Return the hot section for function DECL. Return text_section for
492 hot_function_section (tree decl)
494 if (decl != NULL_TREE
495 && DECL_SECTION_NAME (decl) != NULL_TREE
496 && targetm.have_named_sections)
497 return get_named_section (decl, NULL, 0);
503 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
506 When DECL_SECTION_NAME is non-NULL and it is implicit section and
507 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
508 concatenate the name with NAMED_SECTION_SUFFIX.
509 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
512 get_named_text_section (tree decl,
513 const char *text_section_name,
514 const char *named_section_suffix)
516 if (decl && DECL_SECTION_NAME (decl))
518 if (named_section_suffix)
520 tree dsn = DECL_SECTION_NAME (decl);
521 const char *stripped_name;
524 name = (char *) alloca (TREE_STRING_LENGTH (dsn) + 1);
525 memcpy (name, TREE_STRING_POINTER (dsn),
526 TREE_STRING_LENGTH (dsn) + 1);
528 stripped_name = targetm.strip_name_encoding (name);
530 buffer = ACONCAT ((stripped_name, named_section_suffix, NULL));
531 return get_named_section (decl, buffer, 0);
533 else if (DECL_HAS_IMPLICIT_SECTION_NAME_P (decl))
537 /* Do not try to split gnu_linkonce functions. This gets somewhat
539 if (DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP)
541 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
542 name = targetm.strip_name_encoding (name);
543 return get_named_section (decl, ACONCAT ((text_section_name, ".",
549 return get_named_section (decl, text_section_name, 0);
552 /* Choose named function section based on its frequency. */
555 default_function_section (tree decl, enum node_frequency freq,
556 bool startup, bool exit)
558 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
559 /* Old GNU linkers have buggy --gc-section support, which sometimes
560 results in .gcc_except_table* sections being garbage collected. */
562 && DECL_SECTION_NAME (decl)
563 && DECL_HAS_IMPLICIT_SECTION_NAME_P (decl))
567 if (!flag_reorder_functions
568 || !targetm.have_named_sections)
570 /* Startup code should go to startup subsection unless it is
571 unlikely executed (this happens especially with function splitting
572 where we can split away unnecesary parts of static constructors. */
573 if (startup && freq != NODE_FREQUENCY_UNLIKELY_EXECUTED)
574 return get_named_text_section (decl, ".text.startup", NULL);
576 /* Similarly for exit. */
577 if (exit && freq != NODE_FREQUENCY_UNLIKELY_EXECUTED)
578 return get_named_text_section (decl, ".text.exit", NULL);
580 /* Group cold functions together, similarly for hot code. */
583 case NODE_FREQUENCY_UNLIKELY_EXECUTED:
584 return get_named_text_section (decl, ".text.unlikely", NULL);
585 case NODE_FREQUENCY_HOT:
586 return get_named_text_section (decl, ".text.hot", NULL);
592 /* Return the section for function DECL.
594 If DECL is NULL_TREE, return the text section. We can be passed
595 NULL_TREE under some circumstances by dbxout.c at least.
597 If FORCE_COLD is true, return cold function section ignoring
598 the frequency info of cgraph_node. */
601 function_section_1 (tree decl, bool force_cold)
603 section *section = NULL;
604 enum node_frequency freq = NODE_FREQUENCY_NORMAL;
605 bool startup = false, exit = false;
609 struct cgraph_node *node = cgraph_node (decl);
611 freq = node->frequency;
612 startup = node->only_called_at_startup;
613 exit = node->only_called_at_exit;
616 freq = NODE_FREQUENCY_UNLIKELY_EXECUTED;
618 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
619 if (decl != NULL_TREE
620 && DECL_SECTION_NAME (decl) != NULL_TREE)
622 if (targetm.asm_out.function_section)
623 section = targetm.asm_out.function_section (decl, freq,
627 return get_named_section (decl, NULL, 0);
630 return targetm.asm_out.select_section
631 (decl, freq == NODE_FREQUENCY_UNLIKELY_EXECUTED,
634 if (targetm.asm_out.function_section)
635 section = targetm.asm_out.function_section (decl, freq, startup, exit);
638 return hot_function_section (decl);
642 /* Return the section for function DECL.
644 If DECL is NULL_TREE, return the text section. We can be passed
645 NULL_TREE under some circumstances by dbxout.c at least. */
648 function_section (tree decl)
650 /* Handle cases where function splitting code decides
651 to put function entry point into unlikely executed section
652 despite the fact that the function itself is not cold
653 (i.e. it is called rarely but contains a hot loop that is
654 better to live in hot subsection for the code locality). */
655 return function_section_1 (decl,
656 first_function_block_is_cold);
659 /* Return the section for the current function, take IN_COLD_SECTION_P
663 current_function_section (void)
665 return function_section_1 (current_function_decl, in_cold_section_p);
668 /* Tell assembler to switch to unlikely-to-be-executed text section. */
671 unlikely_text_section (void)
673 return function_section_1 (current_function_decl, true);
676 /* When called within a function context, return true if the function
677 has been assigned a cold text section and if SECT is that section.
678 When called outside a function context, return true if SECT is the
679 default cold section. */
682 unlikely_text_section_p (section *sect)
684 return sect == function_section_1 (current_function_decl, true);
687 /* Return the read-only data section associated with function DECL. */
690 default_function_rodata_section (tree decl)
692 if (decl != NULL_TREE && DECL_SECTION_NAME (decl))
694 const char *name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
696 if (DECL_ONE_ONLY (decl) && HAVE_COMDAT_GROUP)
702 dot = strchr (name + 1, '.');
705 len = strlen (dot) + 8;
706 rname = (char *) alloca (len);
708 strcpy (rname, ".rodata");
710 return get_section (rname, SECTION_LINKONCE, decl);
712 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
713 else if (DECL_ONE_ONLY (decl)
714 && strncmp (name, ".gnu.linkonce.t.", 16) == 0)
716 size_t len = strlen (name) + 1;
717 char *rname = (char *) alloca (len);
719 memcpy (rname, name, len);
721 return get_section (rname, SECTION_LINKONCE, decl);
723 /* For .text.foo we want to use .rodata.foo. */
724 else if (flag_function_sections && flag_data_sections
725 && strncmp (name, ".text.", 6) == 0)
727 size_t len = strlen (name) + 1;
728 char *rname = (char *) alloca (len + 2);
730 memcpy (rname, ".rodata", 7);
731 memcpy (rname + 7, name + 5, len - 5);
732 return get_section (rname, 0, decl);
736 return readonly_data_section;
739 /* Return the read-only data section associated with function DECL
740 for targets where that section should be always the single
741 readonly data section. */
744 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED)
746 return readonly_data_section;
749 /* Return the section to use for string merging. */
752 mergeable_string_section (tree decl ATTRIBUTE_UNUSED,
753 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
754 unsigned int flags ATTRIBUTE_UNUSED)
758 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
759 && TREE_CODE (decl) == STRING_CST
760 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
762 && (len = int_size_in_bytes (TREE_TYPE (decl))) > 0
763 && TREE_STRING_LENGTH (decl) >= len)
765 enum machine_mode mode;
766 unsigned int modesize;
772 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
773 modesize = GET_MODE_BITSIZE (mode);
774 if (modesize >= 8 && modesize <= 256
775 && (modesize & (modesize - 1)) == 0)
777 if (align < modesize)
780 str = TREE_STRING_POINTER (decl);
781 unit = GET_MODE_SIZE (mode);
783 /* Check for embedded NUL characters. */
784 for (i = 0; i < len; i += unit)
786 for (j = 0; j < unit; j++)
787 if (str[i + j] != '\0')
794 sprintf (name, ".rodata.str%d.%d", modesize / 8,
796 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
797 return get_section (name, flags, NULL);
802 return readonly_data_section;
805 /* Return the section to use for constant merging. */
808 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED,
809 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
810 unsigned int flags ATTRIBUTE_UNUSED)
812 unsigned int modesize = GET_MODE_BITSIZE (mode);
814 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
820 && (align & (align - 1)) == 0)
824 sprintf (name, ".rodata.cst%d", (int) (align / 8));
825 flags |= (align / 8) | SECTION_MERGE;
826 return get_section (name, flags, NULL);
828 return readonly_data_section;
831 /* Given NAME, a putative register name, discard any customary prefixes. */
834 strip_reg_name (const char *name)
836 #ifdef REGISTER_PREFIX
837 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
838 name += strlen (REGISTER_PREFIX);
840 if (name[0] == '%' || name[0] == '#')
845 /* The user has asked for a DECL to have a particular name. Set (or
846 change) it in such a way that we don't prefix an underscore to
849 set_user_assembler_name (tree decl, const char *name)
851 char *starred = (char *) alloca (strlen (name) + 2);
853 strcpy (starred + 1, name);
854 change_decl_assembler_name (decl, get_identifier (starred));
855 SET_DECL_RTL (decl, NULL_RTX);
858 /* Decode an `asm' spec for a declaration as a register name.
859 Return the register number, or -1 if nothing specified,
860 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
861 or -3 if ASMSPEC is `cc' and is not recognized,
862 or -4 if ASMSPEC is `memory' and is not recognized.
863 Accept an exact spelling or a decimal number.
864 Prefixes such as % are optional. */
867 decode_reg_name_and_count (const char *asmspec, int *pnregs)
869 /* Presume just one register is clobbered. */
876 /* Get rid of confusing prefixes. */
877 asmspec = strip_reg_name (asmspec);
879 /* Allow a decimal number as a "register name". */
880 for (i = strlen (asmspec) - 1; i >= 0; i--)
881 if (! ISDIGIT (asmspec[i]))
883 if (asmspec[0] != 0 && i < 0)
886 if (i < FIRST_PSEUDO_REGISTER && i >= 0)
892 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
894 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
897 #ifdef OVERLAPPING_REGISTER_NAMES
901 const char *const name;
904 } table[] = OVERLAPPING_REGISTER_NAMES;
906 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
908 && ! strcmp (asmspec, table[i].name))
910 *pnregs = table[i].nregs;
911 return table[i].number;
914 #endif /* OVERLAPPING_REGISTER_NAMES */
916 #ifdef ADDITIONAL_REGISTER_NAMES
918 static const struct { const char *const name; const int number; } table[]
919 = ADDITIONAL_REGISTER_NAMES;
921 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
923 && ! strcmp (asmspec, table[i].name))
924 return table[i].number;
926 #endif /* ADDITIONAL_REGISTER_NAMES */
928 if (!strcmp (asmspec, "memory"))
931 if (!strcmp (asmspec, "cc"))
941 decode_reg_name (const char *name)
944 return decode_reg_name_and_count (name, &count);
948 /* Return true if DECL's initializer is suitable for a BSS section. */
951 bss_initializer_p (const_tree decl)
953 return (DECL_INITIAL (decl) == NULL
954 || DECL_INITIAL (decl) == error_mark_node
955 || (flag_zero_initialized_in_bss
956 /* Leave constant zeroes in .rodata so they
958 && !TREE_READONLY (decl)
959 && initializer_zerop (DECL_INITIAL (decl))));
962 /* Compute the alignment of variable specified by DECL.
963 DONT_OUTPUT_DATA is from assemble_variable. */
966 align_variable (tree decl, bool dont_output_data)
968 unsigned int align = DECL_ALIGN (decl);
970 /* In the case for initialing an array whose length isn't specified,
971 where we have not yet been able to do the layout,
972 figure out the proper alignment now. */
973 if (dont_output_data && DECL_SIZE (decl) == 0
974 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
975 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
977 /* Some object file formats have a maximum alignment which they support.
978 In particular, a.out format supports a maximum alignment of 4. */
979 if (align > MAX_OFILE_ALIGNMENT)
981 warning (0, "alignment of %q+D is greater than maximum object "
982 "file alignment. Using %d", decl,
983 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
984 align = MAX_OFILE_ALIGNMENT;
987 /* On some machines, it is good to increase alignment sometimes. */
988 if (! DECL_USER_ALIGN (decl))
990 #ifdef DATA_ALIGNMENT
991 unsigned int data_align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
992 /* Don't increase alignment too much for TLS variables - TLS space
994 if (! DECL_THREAD_LOCAL_P (decl) || data_align <= BITS_PER_WORD)
997 #ifdef CONSTANT_ALIGNMENT
998 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
1000 unsigned int const_align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl),
1002 /* Don't increase alignment too much for TLS variables - TLS space
1004 if (! DECL_THREAD_LOCAL_P (decl) || const_align <= BITS_PER_WORD)
1005 align = const_align;
1010 /* Reset the alignment in case we have made it tighter, so we can benefit
1011 from it in get_pointer_alignment. */
1012 DECL_ALIGN (decl) = align;
1015 /* Return the section into which the given VAR_DECL or CONST_DECL
1016 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1017 section should be used wherever possible. */
1020 get_variable_section (tree decl, bool prefer_noswitch_p)
1022 addr_space_t as = ADDR_SPACE_GENERIC;
1025 if (TREE_TYPE (decl) != error_mark_node)
1026 as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
1028 if (DECL_COMMON (decl))
1030 /* If the decl has been given an explicit section name, or it resides
1031 in a non-generic address space, then it isn't common, and shouldn't
1032 be handled as such. */
1033 gcc_assert (DECL_SECTION_NAME (decl) == NULL
1034 && ADDR_SPACE_GENERIC_P (as));
1035 if (DECL_THREAD_LOCAL_P (decl))
1036 return tls_comm_section;
1037 else if (TREE_PUBLIC (decl) && bss_initializer_p (decl))
1038 return comm_section;
1041 if (DECL_INITIAL (decl) == error_mark_node)
1042 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
1043 else if (DECL_INITIAL (decl))
1044 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
1048 resolve_unique_section (decl, reloc, flag_data_sections);
1049 if (IN_NAMED_SECTION (decl))
1050 return get_named_section (decl, NULL, reloc);
1052 if (ADDR_SPACE_GENERIC_P (as)
1053 && !DECL_THREAD_LOCAL_P (decl)
1054 && !(prefer_noswitch_p && targetm.have_switchable_bss_sections)
1055 && bss_initializer_p (decl))
1057 if (!TREE_PUBLIC (decl))
1058 return lcomm_section;
1059 if (bss_noswitch_section)
1060 return bss_noswitch_section;
1063 return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
1066 /* Return the block into which object_block DECL should be placed. */
1068 static struct object_block *
1069 get_block_for_decl (tree decl)
1073 if (TREE_CODE (decl) == VAR_DECL)
1075 /* The object must be defined in this translation unit. */
1076 if (DECL_EXTERNAL (decl))
1079 /* There's no point using object blocks for something that is
1080 isolated by definition. */
1081 if (DECL_ONE_ONLY (decl))
1085 /* We can only calculate block offsets if the decl has a known
1087 if (DECL_SIZE_UNIT (decl) == NULL)
1089 if (!host_integerp (DECL_SIZE_UNIT (decl), 1))
1092 /* Find out which section should contain DECL. We cannot put it into
1093 an object block if it requires a standalone definition. */
1094 if (TREE_CODE (decl) == VAR_DECL)
1095 align_variable (decl, 0);
1096 sect = get_variable_section (decl, true);
1097 if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
1100 return get_block_for_section (sect);
1103 /* Make sure block symbol SYMBOL is in block BLOCK. */
1106 change_symbol_block (rtx symbol, struct object_block *block)
1108 if (block != SYMBOL_REF_BLOCK (symbol))
1110 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
1111 SYMBOL_REF_BLOCK (symbol) = block;
1115 /* Return true if it is possible to put DECL in an object_block. */
1118 use_blocks_for_decl_p (tree decl)
1120 /* Only data DECLs can be placed into object blocks. */
1121 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
1124 /* Detect decls created by dw2_force_const_mem. Such decls are
1125 special because DECL_INITIAL doesn't specify the decl's true value.
1126 dw2_output_indirect_constants will instead call assemble_variable
1127 with dont_output_data set to 1 and then print the contents itself. */
1128 if (DECL_INITIAL (decl) == decl)
1131 /* If this decl is an alias, then we don't want to emit a
1133 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl)))
1139 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1140 have static storage duration. In other words, it should not be an
1141 automatic variable, including PARM_DECLs.
1143 There is, however, one exception: this function handles variables
1144 explicitly placed in a particular register by the user.
1146 This is never called for PARM_DECL nodes. */
1149 make_decl_rtl (tree decl)
1151 const char *name = 0;
1155 /* Check that we are not being given an automatic variable. */
1156 gcc_assert (TREE_CODE (decl) != PARM_DECL
1157 && TREE_CODE (decl) != RESULT_DECL);
1159 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1160 gcc_assert (TREE_CODE (decl) != VAR_DECL
1161 || TREE_STATIC (decl)
1162 || TREE_PUBLIC (decl)
1163 || DECL_EXTERNAL (decl)
1164 || DECL_REGISTER (decl));
1166 /* And that we were not given a type or a label. */
1167 gcc_assert (TREE_CODE (decl) != TYPE_DECL
1168 && TREE_CODE (decl) != LABEL_DECL);
1170 /* For a duplicate declaration, we can be called twice on the
1171 same DECL node. Don't discard the RTL already made. */
1172 if (DECL_RTL_SET_P (decl))
1174 /* If the old RTL had the wrong mode, fix the mode. */
1175 x = DECL_RTL (decl);
1176 if (GET_MODE (x) != DECL_MODE (decl))
1177 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
1179 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1182 /* ??? Another way to do this would be to maintain a hashed
1183 table of such critters. Instead of adding stuff to a DECL
1184 to give certain attributes to it, we could use an external
1185 hash map from DECL to set of attributes. */
1187 /* Let the target reassign the RTL if it wants.
1188 This is necessary, for example, when one machine specific
1189 decl attribute overrides another. */
1190 targetm.encode_section_info (decl, DECL_RTL (decl), false);
1192 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1193 on the new decl information. */
1195 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
1196 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x, 0)))
1197 change_symbol_block (XEXP (x, 0), get_block_for_decl (decl));
1199 /* Make this function static known to the mudflap runtime. */
1200 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1201 mudflap_enqueue_decl (decl);
1206 /* If this variable belongs to the global constant pool, retrieve the
1207 pre-computed RTL or recompute it in LTO mode. */
1208 if (TREE_CODE (decl) == VAR_DECL && DECL_IN_CONSTANT_POOL (decl))
1210 SET_DECL_RTL (decl, output_constant_def (DECL_INITIAL (decl), 1));
1214 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1216 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
1217 && DECL_REGISTER (decl))
1219 error ("register name not specified for %q+D", decl);
1221 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1223 const char *asmspec = name+1;
1224 reg_number = decode_reg_name (asmspec);
1225 /* First detect errors in declaring global registers. */
1226 if (reg_number == -1)
1227 error ("register name not specified for %q+D", decl);
1228 else if (reg_number < 0)
1229 error ("invalid register name for %q+D", decl);
1230 else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
1231 error ("data type of %q+D isn%'t suitable for a register",
1233 else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
1234 error ("register specified for %q+D isn%'t suitable for data type",
1236 /* Now handle properly declared static register variables. */
1241 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
1243 DECL_INITIAL (decl) = 0;
1244 error ("global register variable has initial value");
1246 if (TREE_THIS_VOLATILE (decl))
1247 warning (OPT_Wvolatile_register_var,
1248 "optimization may eliminate reads and/or "
1249 "writes to register variables");
1251 /* If the user specified one of the eliminables registers here,
1252 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1253 confused with that register and be eliminated. This usage is
1254 somewhat suspect... */
1256 SET_DECL_RTL (decl, gen_rtx_raw_REG (DECL_MODE (decl), reg_number));
1257 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
1258 REG_USERVAR_P (DECL_RTL (decl)) = 1;
1260 if (TREE_STATIC (decl))
1262 /* Make this register global, so not usable for anything
1264 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1265 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1266 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1268 nregs = hard_regno_nregs[reg_number][DECL_MODE (decl)];
1270 globalize_reg (reg_number + --nregs);
1273 /* As a register variable, it has no section. */
1277 /* Now handle ordinary static variables and functions (in memory).
1278 Also handle vars declared register invalidly. */
1279 else if (name[0] == '*')
1281 #ifdef REGISTER_PREFIX
1282 if (strlen (REGISTER_PREFIX) != 0)
1284 reg_number = decode_reg_name (name);
1285 if (reg_number >= 0 || reg_number == -3)
1286 error ("register name given for non-register variable %q+D", decl);
1291 /* Specifying a section attribute on a variable forces it into a
1292 non-.bss section, and thus it cannot be common. */
1293 /* FIXME: In general this code should not be necessary because
1294 visibility pass is doing the same work. But notice_global_symbol
1295 is called early and it needs to make DECL_RTL to get the name.
1296 we take care of recomputing the DECL_RTL after visibility is changed. */
1297 if (TREE_CODE (decl) == VAR_DECL
1298 && DECL_SECTION_NAME (decl) != NULL_TREE
1299 && DECL_INITIAL (decl) == NULL_TREE
1300 && DECL_COMMON (decl))
1301 DECL_COMMON (decl) = 0;
1303 /* Variables can't be both common and weak. */
1304 if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl))
1305 DECL_COMMON (decl) = 0;
1307 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1308 x = create_block_symbol (name, get_block_for_decl (decl), -1);
1311 enum machine_mode address_mode = Pmode;
1312 if (TREE_TYPE (decl) != error_mark_node)
1314 addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
1315 address_mode = targetm.addr_space.address_mode (as);
1317 x = gen_rtx_SYMBOL_REF (address_mode, name);
1319 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1320 SET_SYMBOL_REF_DECL (x, decl);
1322 x = gen_rtx_MEM (DECL_MODE (decl), x);
1323 if (TREE_CODE (decl) != FUNCTION_DECL)
1324 set_mem_attributes (x, decl, 1);
1325 SET_DECL_RTL (decl, x);
1327 /* Optionally set flags or add text to the name to record information
1328 such as that it is a function name.
1329 If the name is changed, the macro ASM_OUTPUT_LABELREF
1330 will have to know how to strip this information. */
1331 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1333 /* Make this function static known to the mudflap runtime. */
1334 if (flag_mudflap && TREE_CODE (decl) == VAR_DECL)
1335 mudflap_enqueue_decl (decl);
1338 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1339 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1343 make_decl_rtl_for_debug (tree decl)
1345 unsigned int save_aliasing_flag, save_mudflap_flag;
1348 if (DECL_RTL_SET_P (decl))
1349 return DECL_RTL (decl);
1351 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1352 call new_alias_set. If running with -fcompare-debug, sometimes
1353 we do not want to create alias sets that will throw the alias
1354 numbers off in the comparison dumps. So... clearing
1355 flag_strict_aliasing will keep new_alias_set() from creating a
1356 new set. It is undesirable to register decl with mudflap
1357 in this case as well. */
1358 save_aliasing_flag = flag_strict_aliasing;
1359 flag_strict_aliasing = 0;
1360 save_mudflap_flag = flag_mudflap;
1363 rtl = DECL_RTL (decl);
1364 /* Reset DECL_RTL back, as various parts of the compiler expects
1365 DECL_RTL set meaning it is actually going to be output. */
1366 SET_DECL_RTL (decl, NULL);
1368 flag_strict_aliasing = save_aliasing_flag;
1369 flag_mudflap = save_mudflap_flag;
1374 /* Output a string of literal assembler code
1375 for an `asm' keyword used between functions. */
1378 assemble_asm (tree string)
1382 if (TREE_CODE (string) == ADDR_EXPR)
1383 string = TREE_OPERAND (string, 0);
1385 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
1388 /* Record an element in the table of global destructors. SYMBOL is
1389 a SYMBOL_REF of the function to be called; PRIORITY is a number
1390 between 0 and MAX_INIT_PRIORITY. */
1393 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED,
1394 int priority ATTRIBUTE_UNUSED)
1396 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1397 /* Tell GNU LD that this is part of the static destructor set.
1398 This will work for any system that uses stabs, most usefully
1400 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1401 dbxout_stab_value_label (XSTR (symbol, 0));
1403 sorry ("global destructors not supported on this target");
1407 /* Write the address of the entity given by SYMBOL to SEC. */
1409 assemble_addr_to_section (rtx symbol, section *sec)
1411 switch_to_section (sec);
1412 assemble_align (POINTER_SIZE);
1413 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1416 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1417 not) section for PRIORITY. */
1419 get_cdtor_priority_section (int priority, bool constructor_p)
1423 /* ??? This only works reliably with the GNU linker. */
1424 sprintf (buf, "%s.%.5u",
1425 constructor_p ? ".ctors" : ".dtors",
1426 /* Invert the numbering so the linker puts us in the proper
1427 order; constructors are run from right to left, and the
1428 linker sorts in increasing order. */
1429 MAX_INIT_PRIORITY - priority);
1430 return get_section (buf, SECTION_WRITE, NULL);
1434 default_named_section_asm_out_destructor (rtx symbol, int priority)
1438 if (priority != DEFAULT_INIT_PRIORITY)
1439 sec = get_cdtor_priority_section (priority,
1440 /*constructor_p=*/false);
1442 sec = get_section (".dtors", SECTION_WRITE, NULL);
1444 assemble_addr_to_section (symbol, sec);
1447 #ifdef DTORS_SECTION_ASM_OP
1449 default_dtor_section_asm_out_destructor (rtx symbol,
1450 int priority ATTRIBUTE_UNUSED)
1452 assemble_addr_to_section (symbol, dtors_section);
1456 /* Likewise for global constructors. */
1459 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED,
1460 int priority ATTRIBUTE_UNUSED)
1462 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1463 /* Tell GNU LD that this is part of the static destructor set.
1464 This will work for any system that uses stabs, most usefully
1466 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1467 dbxout_stab_value_label (XSTR (symbol, 0));
1469 sorry ("global constructors not supported on this target");
1474 default_named_section_asm_out_constructor (rtx symbol, int priority)
1478 if (priority != DEFAULT_INIT_PRIORITY)
1479 sec = get_cdtor_priority_section (priority,
1480 /*constructor_p=*/true);
1482 sec = get_section (".ctors", SECTION_WRITE, NULL);
1484 assemble_addr_to_section (symbol, sec);
1487 #ifdef CTORS_SECTION_ASM_OP
1489 default_ctor_section_asm_out_constructor (rtx symbol,
1490 int priority ATTRIBUTE_UNUSED)
1492 assemble_addr_to_section (symbol, ctors_section);
1496 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1497 a nonzero value if the constant pool should be output before the
1498 start of the function, or a zero value if the pool should output
1499 after the end of the function. The default is to put it before the
1502 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1503 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1506 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1507 to be output to assembler.
1508 Set first_global_object_name and weak_global_object_name as appropriate. */
1511 notice_global_symbol (tree decl)
1513 const char **type = &first_global_object_name;
1515 if (first_global_object_name
1516 || !TREE_PUBLIC (decl)
1517 || DECL_EXTERNAL (decl)
1518 || !DECL_NAME (decl)
1519 || (TREE_CODE (decl) != FUNCTION_DECL
1520 && (TREE_CODE (decl) != VAR_DECL
1521 || (DECL_COMMON (decl)
1522 && (DECL_INITIAL (decl) == 0
1523 || DECL_INITIAL (decl) == error_mark_node))))
1524 || !MEM_P (DECL_RTL (decl)))
1527 /* We win when global object is found, but it is useful to know about weak
1528 symbol as well so we can produce nicer unique names. */
1529 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl) || flag_shlib)
1530 type = &weak_global_object_name;
1536 rtx decl_rtl = DECL_RTL (decl);
1538 p = targetm.strip_name_encoding (XSTR (XEXP (decl_rtl, 0), 0));
1539 name = ggc_strdup (p);
1545 /* Output assembler code for the constant pool of a function and associated
1546 with defining the name of the function. DECL describes the function.
1547 NAME is the function's name. For the constant pool, we use the current
1548 constant pool data. */
1551 assemble_start_function (tree decl, const char *fnname)
1554 char tmp_label[100];
1555 bool hot_label_written = false;
1557 first_function_block_is_cold = false;
1558 if (flag_reorder_blocks_and_partition)
1560 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1561 crtl->subsections.hot_section_label = ggc_strdup (tmp_label);
1562 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1563 crtl->subsections.cold_section_label = ggc_strdup (tmp_label);
1564 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1565 crtl->subsections.hot_section_end_label = ggc_strdup (tmp_label);
1566 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1567 crtl->subsections.cold_section_end_label = ggc_strdup (tmp_label);
1572 crtl->subsections.hot_section_label = NULL;
1573 crtl->subsections.cold_section_label = NULL;
1574 crtl->subsections.hot_section_end_label = NULL;
1575 crtl->subsections.cold_section_end_label = NULL;
1578 /* The following code does not need preprocessing in the assembler. */
1582 if (CONSTANT_POOL_BEFORE_FUNCTION)
1583 output_constant_pool (fnname, decl);
1585 /* Make sure the not and cold text (code) sections are properly
1586 aligned. This is necessary here in the case where the function
1587 has both hot and cold sections, because we don't want to re-set
1588 the alignment when the section switch happens mid-function. */
1590 if (flag_reorder_blocks_and_partition)
1592 switch_to_section (unlikely_text_section ());
1593 assemble_align (DECL_ALIGN (decl));
1594 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_label);
1596 /* When the function starts with a cold section, we need to explicitly
1597 align the hot section and write out the hot section label.
1598 But if the current function is a thunk, we do not have a CFG. */
1600 && BB_PARTITION (ENTRY_BLOCK_PTR->next_bb) == BB_COLD_PARTITION)
1602 switch_to_section (text_section);
1603 assemble_align (DECL_ALIGN (decl));
1604 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1605 hot_label_written = true;
1606 first_function_block_is_cold = true;
1609 else if (DECL_SECTION_NAME (decl))
1611 /* Calls to function_section rely on first_function_block_is_cold
1613 first_function_block_is_cold
1614 = (cgraph_node (current_function_decl)->frequency
1615 == NODE_FREQUENCY_UNLIKELY_EXECUTED);
1618 in_cold_section_p = first_function_block_is_cold;
1620 /* Switch to the correct text section for the start of the function. */
1622 switch_to_section (function_section (decl));
1623 if (flag_reorder_blocks_and_partition
1624 && !hot_label_written)
1625 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1627 /* Tell assembler to move to target machine's alignment for functions. */
1628 align = floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT);
1631 ASM_OUTPUT_ALIGN (asm_out_file, align);
1634 /* Handle a user-specified function alignment.
1635 Note that we still need to align to DECL_ALIGN, as above,
1636 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1637 if (! DECL_USER_ALIGN (decl)
1638 && align_functions_log > align
1639 && optimize_function_for_speed_p (cfun))
1641 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1642 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1643 align_functions_log, align_functions - 1);
1645 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1649 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1650 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1653 if (!DECL_IGNORED_P (decl))
1654 (*debug_hooks->begin_function) (decl);
1656 /* Make function name accessible from other files, if appropriate. */
1658 if (TREE_PUBLIC (decl))
1660 notice_global_symbol (decl);
1662 globalize_decl (decl);
1664 maybe_assemble_visibility (decl);
1667 if (DECL_PRESERVE_P (decl))
1668 targetm.asm_out.mark_decl_preserved (fnname);
1670 /* Do any machine/system dependent processing of the function name. */
1671 #ifdef ASM_DECLARE_FUNCTION_NAME
1672 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1674 /* Standard thing is just output label for the function. */
1675 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file, fnname, current_function_decl);
1676 #endif /* ASM_DECLARE_FUNCTION_NAME */
1678 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl)))
1679 saw_no_split_stack = true;
1682 /* Output assembler code associated with defining the size of the
1683 function. DECL describes the function. NAME is the function's name. */
1686 assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
1688 #ifdef ASM_DECLARE_FUNCTION_SIZE
1689 /* We could have switched section in the middle of the function. */
1690 if (flag_reorder_blocks_and_partition)
1691 switch_to_section (function_section (decl));
1692 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1694 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1696 output_constant_pool (fnname, decl);
1697 switch_to_section (function_section (decl)); /* need to switch back */
1699 /* Output labels for end of hot/cold text sections (to be used by
1701 if (flag_reorder_blocks_and_partition)
1703 section *save_text_section;
1705 save_text_section = in_section;
1706 switch_to_section (unlikely_text_section ());
1707 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_end_label);
1708 if (first_function_block_is_cold)
1709 switch_to_section (text_section);
1711 switch_to_section (function_section (decl));
1712 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_end_label);
1713 switch_to_section (save_text_section);
1717 /* Assemble code to leave SIZE bytes of zeros. */
1720 assemble_zeros (unsigned HOST_WIDE_INT size)
1722 /* Do no output if -fsyntax-only. */
1723 if (flag_syntax_only)
1726 #ifdef ASM_NO_SKIP_IN_TEXT
1727 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1728 so we must output 0s explicitly in the text section. */
1729 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1731 unsigned HOST_WIDE_INT i;
1732 for (i = 0; i < size; i++)
1733 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1738 ASM_OUTPUT_SKIP (asm_out_file, size);
1741 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1744 assemble_align (int align)
1746 if (align > BITS_PER_UNIT)
1748 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1752 /* Assemble a string constant with the specified C string as contents. */
1755 assemble_string (const char *p, int size)
1760 /* If the string is very long, split it up. */
1764 int thissize = size - pos;
1765 if (thissize > maximum)
1768 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1776 /* A noswitch_section_callback for lcomm_section. */
1779 emit_local (tree decl ATTRIBUTE_UNUSED,
1780 const char *name ATTRIBUTE_UNUSED,
1781 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1782 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1784 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1785 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name,
1786 size, DECL_ALIGN (decl));
1788 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1789 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl));
1792 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1797 /* A noswitch_section_callback for bss_noswitch_section. */
1799 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1801 emit_bss (tree decl ATTRIBUTE_UNUSED,
1802 const char *name ATTRIBUTE_UNUSED,
1803 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1804 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1806 #if defined ASM_OUTPUT_ALIGNED_BSS
1807 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl));
1810 ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded);
1816 /* A noswitch_section_callback for comm_section. */
1819 emit_common (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_COMMON
1825 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name,
1826 size, DECL_ALIGN (decl));
1828 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1829 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl));
1832 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1837 /* A noswitch_section_callback for tls_comm_section. */
1840 emit_tls_common (tree decl ATTRIBUTE_UNUSED,
1841 const char *name ATTRIBUTE_UNUSED,
1842 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1843 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1845 #ifdef ASM_OUTPUT_TLS_COMMON
1846 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1849 sorry ("thread-local COMMON data not implemented");
1854 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1855 NAME is the name of DECL's SYMBOL_REF. */
1858 assemble_noswitch_variable (tree decl, const char *name, section *sect)
1860 unsigned HOST_WIDE_INT size, rounded;
1862 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1865 /* Don't allocate zero bytes of common,
1866 since that means "undefined external" in the linker. */
1870 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1871 so that each uninitialized object starts on such a boundary. */
1872 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
1873 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1874 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1876 if (!sect->noswitch.callback (decl, name, size, rounded)
1877 && (unsigned HOST_WIDE_INT) DECL_ALIGN_UNIT (decl) > rounded)
1878 warning (0, "requested alignment for %q+D is greater than "
1879 "implemented alignment of %wu", decl, rounded);
1882 /* A subroutine of assemble_variable. Output the label and contents of
1883 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1884 is as for assemble_variable. */
1887 assemble_variable_contents (tree decl, const char *name,
1888 bool dont_output_data)
1890 /* Do any machine/system dependent processing of the object. */
1891 #ifdef ASM_DECLARE_OBJECT_NAME
1892 last_assemble_variable_decl = decl;
1893 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
1895 /* Standard thing is just output label for the object. */
1896 ASM_OUTPUT_LABEL (asm_out_file, name);
1897 #endif /* ASM_DECLARE_OBJECT_NAME */
1899 if (!dont_output_data)
1901 if (DECL_INITIAL (decl)
1902 && DECL_INITIAL (decl) != error_mark_node
1903 && !initializer_zerop (DECL_INITIAL (decl)))
1904 /* Output the actual data. */
1905 output_constant (DECL_INITIAL (decl),
1906 tree_low_cst (DECL_SIZE_UNIT (decl), 1),
1909 /* Leave space for it. */
1910 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
1914 /* Assemble everything that is needed for a variable or function declaration.
1915 Not used for automatic variables, and not used for function definitions.
1916 Should not be called for variables of incomplete structure type.
1918 TOP_LEVEL is nonzero if this variable has file scope.
1919 AT_END is nonzero if this is the special handling, at end of compilation,
1920 to define things that have had only tentative definitions.
1921 DONT_OUTPUT_DATA if nonzero means don't actually output the
1922 initial value (that will be done by the caller). */
1925 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
1926 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
1929 rtx decl_rtl, symbol;
1932 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1933 gcc_assert (TREE_CODE (decl) == VAR_DECL);
1935 /* Emulated TLS had better not get this far. */
1936 gcc_checking_assert (targetm.have_tls || !DECL_THREAD_LOCAL_P (decl));
1938 last_assemble_variable_decl = 0;
1940 /* Normally no need to say anything here for external references,
1941 since assemble_external is called by the language-specific code
1942 when a declaration is first seen. */
1944 if (DECL_EXTERNAL (decl))
1947 /* Do nothing for global register variables. */
1948 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
1950 TREE_ASM_WRITTEN (decl) = 1;
1954 /* If type was incomplete when the variable was declared,
1955 see if it is complete now. */
1957 if (DECL_SIZE (decl) == 0)
1958 layout_decl (decl, 0);
1960 /* Still incomplete => don't allocate it; treat the tentative defn
1961 (which is what it must have been) as an `extern' reference. */
1963 if (!dont_output_data && DECL_SIZE (decl) == 0)
1965 error ("storage size of %q+D isn%'t known", decl);
1966 TREE_ASM_WRITTEN (decl) = 1;
1970 /* The first declaration of a variable that comes through this function
1971 decides whether it is global (in C, has external linkage)
1972 or local (in C, has internal linkage). So do nothing more
1973 if this function has already run. */
1975 if (TREE_ASM_WRITTEN (decl))
1978 /* Make sure targetm.encode_section_info is invoked before we set
1980 decl_rtl = DECL_RTL (decl);
1982 TREE_ASM_WRITTEN (decl) = 1;
1984 /* Do no output if -fsyntax-only. */
1985 if (flag_syntax_only)
1988 if (! dont_output_data
1989 && ! host_integerp (DECL_SIZE_UNIT (decl), 1))
1991 error ("size of variable %q+D is too large", decl);
1995 gcc_assert (MEM_P (decl_rtl));
1996 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
1997 symbol = XEXP (decl_rtl, 0);
1999 /* If this symbol belongs to the tree constant pool, output the constant
2000 if it hasn't already been written. */
2001 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
2003 tree decl = SYMBOL_REF_DECL (symbol);
2004 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl)))
2005 output_constant_def_contents (symbol);
2011 name = XSTR (symbol, 0);
2012 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
2013 notice_global_symbol (decl);
2015 /* Compute the alignment of this data. */
2017 align_variable (decl, dont_output_data);
2018 set_mem_align (decl_rtl, DECL_ALIGN (decl));
2020 if (TREE_PUBLIC (decl))
2021 maybe_assemble_visibility (decl);
2023 if (DECL_PRESERVE_P (decl))
2024 targetm.asm_out.mark_decl_preserved (name);
2026 /* First make the assembler name(s) global if appropriate. */
2027 sect = get_variable_section (decl, false);
2028 if (TREE_PUBLIC (decl)
2029 && (sect->common.flags & SECTION_COMMON) == 0)
2030 globalize_decl (decl);
2032 /* Output any data that we will need to use the address of. */
2033 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
2034 output_addressed_constants (DECL_INITIAL (decl));
2036 /* dbxout.c needs to know this. */
2037 if (sect && (sect->common.flags & SECTION_CODE) != 0)
2038 DECL_IN_TEXT_SECTION (decl) = 1;
2040 /* If the decl is part of an object_block, make sure that the decl
2041 has been positioned within its block, but do not write out its
2042 definition yet. output_object_blocks will do that later. */
2043 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
2045 gcc_assert (!dont_output_data);
2046 place_block_symbol (symbol);
2048 else if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
2049 assemble_noswitch_variable (decl, name, sect);
2052 switch_to_section (sect);
2053 if (DECL_ALIGN (decl) > BITS_PER_UNIT)
2054 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (DECL_ALIGN_UNIT (decl)));
2055 assemble_variable_contents (decl, name, dont_output_data);
2059 /* Return 1 if type TYPE contains any pointers. */
2062 contains_pointers_p (tree type)
2064 switch (TREE_CODE (type))
2067 case REFERENCE_TYPE:
2068 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2069 so I'll play safe and return 1. */
2075 case QUAL_UNION_TYPE:
2078 /* For a type that has fields, see if the fields have pointers. */
2079 for (fields = TYPE_FIELDS (type); fields; fields = DECL_CHAIN (fields))
2080 if (TREE_CODE (fields) == FIELD_DECL
2081 && contains_pointers_p (TREE_TYPE (fields)))
2087 /* An array type contains pointers if its element type does. */
2088 return contains_pointers_p (TREE_TYPE (type));
2095 /* We delay assemble_external processing until
2096 the compilation unit is finalized. This is the best we can do for
2097 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2098 it all the way to final. See PR 17982 for further discussion. */
2099 static GTY(()) tree pending_assemble_externals;
2101 /* FIXME: Trunk is at GCC 4.8 now and the above problem still hasn't been
2102 addressed properly. This caused PR 52640 due to O(external_decls**2)
2103 lookups in the pending_assemble_externals TREE_LIST in assemble_external.
2104 Paper over with this pointer set, which we use to see if we have already
2105 added a decl to pending_assemble_externals without first traversing
2106 the entire pending_assemble_externals list. See assemble_external(). */
2107 static struct pointer_set_t *pending_assemble_externals_set;
2109 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2110 As a result, assemble_external can be called after the list of externals
2111 is processed and the pointer set destroyed. */
2112 static bool pending_assemble_externals_processed;
2114 #ifdef ASM_OUTPUT_EXTERNAL
2115 /* True if DECL is a function decl for which no out-of-line copy exists.
2116 It is assumed that DECL's assembler name has been set. */
2119 incorporeal_function_p (tree decl)
2121 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
2125 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
2126 && DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA)
2129 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
2130 if (is_builtin_name (name))
2136 /* Actually do the tests to determine if this is necessary, and invoke
2137 ASM_OUTPUT_EXTERNAL. */
2139 assemble_external_real (tree decl)
2141 rtx rtl = DECL_RTL (decl);
2143 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
2144 && !SYMBOL_REF_USED (XEXP (rtl, 0))
2145 && !incorporeal_function_p (decl))
2147 /* Some systems do require some output. */
2148 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
2149 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
2155 process_pending_assemble_externals (void)
2157 #ifdef ASM_OUTPUT_EXTERNAL
2159 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
2160 assemble_external_real (TREE_VALUE (list));
2162 pending_assemble_externals = 0;
2163 pending_assemble_externals_processed = true;
2164 pointer_set_destroy (pending_assemble_externals_set);
2168 /* This TREE_LIST contains any weak symbol declarations waiting
2170 static GTY(()) tree weak_decls;
2172 /* Output something to declare an external symbol to the assembler,
2173 and qualifiers such as weakness. (Most assemblers don't need
2174 extern declaration, so we normally output nothing.) Do nothing if
2175 DECL is not external. */
2178 assemble_external (tree decl ATTRIBUTE_UNUSED)
2180 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2181 main body of this code is only rarely exercised. To provide some
2182 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2183 open. If it's not, we should not be calling this function. */
2184 gcc_assert (asm_out_file);
2186 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
2189 /* We want to output annotation for weak and external symbols at
2190 very last to check if they are references or not. */
2192 if (TARGET_SUPPORTS_WEAK
2194 /* TREE_STATIC is a weird and abused creature which is not
2195 generally the right test for whether an entity has been
2196 locally emitted, inlined or otherwise not-really-extern, but
2197 for declarations that can be weak, it happens to be
2199 && !TREE_STATIC (decl)
2200 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl))
2201 && value_member (decl, weak_decls) == NULL_TREE)
2202 weak_decls = tree_cons (NULL, decl, weak_decls);
2204 #ifdef ASM_OUTPUT_EXTERNAL
2205 if (pending_assemble_externals_processed)
2207 assemble_external_real (decl);
2211 if (! pointer_set_insert (pending_assemble_externals_set, decl))
2212 pending_assemble_externals = tree_cons (NULL, decl,
2213 pending_assemble_externals);
2217 /* Similar, for calling a library function FUN. */
2220 assemble_external_libcall (rtx fun)
2222 /* Declare library function name external when first used, if nec. */
2223 if (! SYMBOL_REF_USED (fun))
2225 SYMBOL_REF_USED (fun) = 1;
2226 targetm.asm_out.external_libcall (fun);
2230 /* Assemble a label named NAME. */
2233 assemble_label (FILE *file, const char *name)
2235 ASM_OUTPUT_LABEL (file, name);
2238 /* Set the symbol_referenced flag for ID. */
2240 mark_referenced (tree id)
2242 TREE_SYMBOL_REFERENCED (id) = 1;
2245 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2247 mark_decl_referenced (tree decl)
2249 if (TREE_CODE (decl) == FUNCTION_DECL)
2251 /* Extern inline functions don't become needed when referenced.
2252 If we know a method will be emitted in other TU and no new
2253 functions can be marked reachable, just use the external
2255 struct cgraph_node *node = cgraph_node (decl);
2256 if (!DECL_EXTERNAL (decl)
2257 && (!node->local.vtable_method || !cgraph_global_info_ready
2258 || !node->local.finalized))
2259 cgraph_mark_needed_node (node);
2261 else if (TREE_CODE (decl) == VAR_DECL)
2263 struct varpool_node *node = varpool_node (decl);
2264 varpool_mark_needed_node (node);
2265 /* C++ frontend use mark_decl_references to force COMDAT variables
2266 to be output that might appear dead otherwise. */
2267 node->force_output = true;
2269 /* else do nothing - we can get various sorts of CST nodes here,
2270 which do not need to be marked. */
2274 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2275 until we find an identifier that is not itself a transparent alias.
2276 Modify the alias passed to it by reference (and all aliases on the
2277 way to the ultimate target), such that they do not have to be
2278 followed again, and return the ultimate target of the alias
2282 ultimate_transparent_alias_target (tree *alias)
2284 tree target = *alias;
2286 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
2288 gcc_assert (TREE_CHAIN (target));
2289 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
2290 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
2291 && ! TREE_CHAIN (target));
2298 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2299 starts with a *, the rest of NAME is output verbatim. Otherwise
2300 NAME is transformed in a target-specific way (usually by the
2301 addition of an underscore). */
2304 assemble_name_raw (FILE *file, const char *name)
2307 fputs (&name[1], file);
2309 ASM_OUTPUT_LABELREF (file, name);
2312 /* Like assemble_name_raw, but should be used when NAME might refer to
2313 an entity that is also represented as a tree (like a function or
2314 variable). If NAME does refer to such an entity, that entity will
2315 be marked as referenced. */
2318 assemble_name (FILE *file, const char *name)
2320 const char *real_name;
2323 real_name = targetm.strip_name_encoding (name);
2325 id = maybe_get_identifier (real_name);
2330 mark_referenced (id);
2331 ultimate_transparent_alias_target (&id);
2333 name = IDENTIFIER_POINTER (id);
2334 gcc_assert (! TREE_CHAIN (id));
2337 assemble_name_raw (file, name);
2340 /* Allocate SIZE bytes writable static space with a gensym name
2341 and return an RTX to refer to its address. */
2344 assemble_static_space (unsigned HOST_WIDE_INT size)
2347 const char *namestring;
2350 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2352 namestring = ggc_strdup (name);
2354 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2355 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2357 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2358 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2361 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2362 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2365 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2366 so that each uninitialized object starts on such a boundary. */
2367 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2368 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2369 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2370 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2371 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2372 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2379 /* Assemble the static constant template for function entry trampolines.
2380 This is done at most once per compilation.
2381 Returns an RTX for the address of the template. */
2383 static GTY(()) rtx initial_trampoline;
2386 assemble_trampoline_template (void)
2393 gcc_assert (targetm.asm_out.trampoline_template != NULL);
2395 if (initial_trampoline)
2396 return initial_trampoline;
2398 /* By default, put trampoline templates in read-only data section. */
2400 #ifdef TRAMPOLINE_SECTION
2401 switch_to_section (TRAMPOLINE_SECTION);
2403 switch_to_section (readonly_data_section);
2406 /* Write the assembler code to define one. */
2407 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2409 ASM_OUTPUT_ALIGN (asm_out_file, align);
2411 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2412 targetm.asm_out.trampoline_template (asm_out_file);
2414 /* Record the rtl to refer to it. */
2415 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2416 name = ggc_strdup (label);
2417 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2418 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2420 initial_trampoline = gen_const_mem (BLKmode, symbol);
2421 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2422 set_mem_size (initial_trampoline, GEN_INT (TRAMPOLINE_SIZE));
2424 return initial_trampoline;
2427 /* A and B are either alignments or offsets. Return the minimum alignment
2428 that may be assumed after adding the two together. */
2430 static inline unsigned
2431 min_align (unsigned int a, unsigned int b)
2433 return (a | b) & -(a | b);
2436 /* Return the assembler directive for creating a given kind of integer
2437 object. SIZE is the number of bytes in the object and ALIGNED_P
2438 indicates whether it is known to be aligned. Return NULL if the
2439 assembly dialect has no such directive.
2441 The returned string should be printed at the start of a new line and
2442 be followed immediately by the object's initial value. */
2445 integer_asm_op (int size, int aligned_p)
2447 struct asm_int_op *ops;
2450 ops = &targetm.asm_out.aligned_op;
2452 ops = &targetm.asm_out.unaligned_op;
2457 return targetm.asm_out.byte_op;
2471 /* Use directive OP to assemble an integer object X. Print OP at the
2472 start of the line, followed immediately by the value of X. */
2475 assemble_integer_with_op (const char *op, rtx x)
2477 fputs (op, asm_out_file);
2478 output_addr_const (asm_out_file, x);
2479 fputc ('\n', asm_out_file);
2482 /* The default implementation of the asm_out.integer target hook. */
2485 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2486 unsigned int size ATTRIBUTE_UNUSED,
2487 int aligned_p ATTRIBUTE_UNUSED)
2489 const char *op = integer_asm_op (size, aligned_p);
2490 /* Avoid GAS bugs for large values. Specifically negative values whose
2491 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2492 if (size > UNITS_PER_WORD && size > POINTER_SIZE / BITS_PER_UNIT)
2494 return op && (assemble_integer_with_op (op, x), true);
2497 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2498 the alignment of the integer in bits. Return 1 if we were able to output
2499 the constant, otherwise 0. We must be able to output the constant,
2500 if FORCE is nonzero. */
2503 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2507 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2509 /* See if the target hook can handle this kind of object. */
2510 if (targetm.asm_out.integer (x, size, aligned_p))
2513 /* If the object is a multi-byte one, try splitting it up. Split
2514 it into words it if is multi-word, otherwise split it into bytes. */
2517 enum machine_mode omode, imode;
2518 unsigned int subalign;
2519 unsigned int subsize, i;
2520 enum mode_class mclass;
2522 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2523 subalign = MIN (align, subsize * BITS_PER_UNIT);
2524 if (GET_CODE (x) == CONST_FIXED)
2525 mclass = GET_MODE_CLASS (GET_MODE (x));
2529 omode = mode_for_size (subsize * BITS_PER_UNIT, mclass, 0);
2530 imode = mode_for_size (size * BITS_PER_UNIT, mclass, 0);
2532 for (i = 0; i < size; i += subsize)
2534 rtx partial = simplify_subreg (omode, x, imode, i);
2535 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2541 /* If we've printed some of it, but not all of it, there's no going
2546 gcc_assert (!force);
2552 assemble_real (REAL_VALUE_TYPE d, enum machine_mode mode, unsigned int align)
2554 long data[4] = {0, 0, 0, 0};
2556 int bitsize, nelts, nunits, units_per;
2558 /* This is hairy. We have a quantity of known size. real_to_target
2559 will put it into an array of *host* longs, 32 bits per element
2560 (even if long is more than 32 bits). We need to determine the
2561 number of array elements that are occupied (nelts) and the number
2562 of *target* min-addressable units that will be occupied in the
2563 object file (nunits). We cannot assume that 32 divides the
2564 mode's bitsize (size * BITS_PER_UNIT) evenly.
2566 size * BITS_PER_UNIT is used here to make sure that padding bits
2567 (which might appear at either end of the value; real_to_target
2568 will include the padding bits in its output array) are included. */
2570 nunits = GET_MODE_SIZE (mode);
2571 bitsize = nunits * BITS_PER_UNIT;
2572 nelts = CEIL (bitsize, 32);
2573 units_per = 32 / BITS_PER_UNIT;
2575 real_to_target (data, &d, mode);
2577 /* Put out the first word with the specified alignment. */
2578 assemble_integer (GEN_INT (data[0]), MIN (nunits, units_per), align, 1);
2579 nunits -= units_per;
2581 /* Subsequent words need only 32-bit alignment. */
2582 align = min_align (align, 32);
2584 for (i = 1; i < nelts; i++)
2586 assemble_integer (GEN_INT (data[i]), MIN (nunits, units_per), align, 1);
2587 nunits -= units_per;
2591 /* Given an expression EXP with a constant value,
2592 reduce it to the sum of an assembler symbol and an integer.
2593 Store them both in the structure *VALUE.
2594 EXP must be reducible. */
2598 HOST_WIDE_INT offset;
2602 decode_addr_const (tree exp, struct addr_const *value)
2604 tree target = TREE_OPERAND (exp, 0);
2610 if (TREE_CODE (target) == COMPONENT_REF
2611 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2613 offset += int_byte_position (TREE_OPERAND (target, 1));
2614 target = TREE_OPERAND (target, 0);
2616 else if (TREE_CODE (target) == ARRAY_REF
2617 || TREE_CODE (target) == ARRAY_RANGE_REF)
2619 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2620 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2621 target = TREE_OPERAND (target, 0);
2623 else if (TREE_CODE (target) == MEM_REF
2624 && TREE_CODE (TREE_OPERAND (target, 0)) == ADDR_EXPR)
2626 offset += mem_ref_offset (target).low;
2627 target = TREE_OPERAND (TREE_OPERAND (target, 0), 0);
2629 else if (TREE_CODE (target) == INDIRECT_REF
2630 && TREE_CODE (TREE_OPERAND (target, 0)) == NOP_EXPR
2631 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target, 0), 0))
2633 target = TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target, 0), 0), 0);
2638 switch (TREE_CODE (target))
2642 x = DECL_RTL (target);
2646 x = gen_rtx_MEM (FUNCTION_MODE,
2647 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2656 x = output_constant_def (target, 1);
2663 gcc_assert (MEM_P (x));
2667 value->offset = offset;
2671 static GTY((param_is (struct constant_descriptor_tree)))
2672 htab_t const_desc_htab;
2674 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2676 /* Constant pool accessor function. */
2679 constant_pool_htab (void)
2681 return const_desc_htab;
2684 /* Compute a hash code for a constant expression. */
2687 const_desc_hash (const void *ptr)
2689 return ((const struct constant_descriptor_tree *)ptr)->hash;
2693 const_hash_1 (const tree exp)
2698 enum tree_code code = TREE_CODE (exp);
2700 /* Either set P and LEN to the address and len of something to hash and
2701 exit the switch or return a value. */
2706 p = (char *) &TREE_INT_CST (exp);
2707 len = sizeof TREE_INT_CST (exp);
2711 return real_hash (TREE_REAL_CST_PTR (exp));
2714 return fixed_hash (TREE_FIXED_CST_PTR (exp));
2717 p = TREE_STRING_POINTER (exp);
2718 len = TREE_STRING_LENGTH (exp);
2722 return (const_hash_1 (TREE_REALPART (exp)) * 5
2723 + const_hash_1 (TREE_IMAGPART (exp)));
2729 hi = 7 + TYPE_VECTOR_SUBPARTS (TREE_TYPE (exp));
2731 for (link = TREE_VECTOR_CST_ELTS (exp); link; link = TREE_CHAIN (link))
2732 hi = hi * 563 + const_hash_1 (TREE_VALUE (link));
2739 unsigned HOST_WIDE_INT idx;
2742 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2744 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2746 hi = hi * 603 + const_hash_1 (value);
2754 struct addr_const value;
2756 decode_addr_const (exp, &value);
2757 switch (GET_CODE (value.base))
2760 /* Don't hash the address of the SYMBOL_REF;
2761 only use the offset and the symbol name. */
2763 p = XSTR (value.base, 0);
2764 for (i = 0; p[i] != 0; i++)
2765 hi = ((hi * 613) + (unsigned) (p[i]));
2769 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2779 case POINTER_PLUS_EXPR:
2781 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2782 + const_hash_1 (TREE_OPERAND (exp, 1)));
2785 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2788 /* A language specific constant. Just hash the code. */
2792 /* Compute hashing function. */
2794 for (i = 0; i < len; i++)
2795 hi = ((hi * 613) + (unsigned) (p[i]));
2800 /* Wrapper of compare_constant, for the htab interface. */
2802 const_desc_eq (const void *p1, const void *p2)
2804 const struct constant_descriptor_tree *const c1
2805 = (const struct constant_descriptor_tree *) p1;
2806 const struct constant_descriptor_tree *const c2
2807 = (const struct constant_descriptor_tree *) p2;
2808 if (c1->hash != c2->hash)
2810 return compare_constant (c1->value, c2->value);
2813 /* Compare t1 and t2, and return 1 only if they are known to result in
2814 the same bit pattern on output. */
2817 compare_constant (const tree t1, const tree t2)
2819 enum tree_code typecode;
2821 if (t1 == NULL_TREE)
2822 return t2 == NULL_TREE;
2823 if (t2 == NULL_TREE)
2826 if (TREE_CODE (t1) != TREE_CODE (t2))
2829 switch (TREE_CODE (t1))
2832 /* Integer constants are the same only if the same width of type. */
2833 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2835 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2837 return tree_int_cst_equal (t1, t2);
2840 /* Real constants are the same only if the same width of type. */
2841 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2844 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2847 /* Fixed constants are the same only if the same width of type. */
2848 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2851 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1), TREE_FIXED_CST (t2));
2854 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2857 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2858 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2859 TREE_STRING_LENGTH (t1)));
2862 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2863 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2869 if (TYPE_VECTOR_SUBPARTS (TREE_TYPE (t1))
2870 != TYPE_VECTOR_SUBPARTS (TREE_TYPE (t2)))
2873 link2 = TREE_VECTOR_CST_ELTS (t2);
2874 for (link1 = TREE_VECTOR_CST_ELTS (t1);
2876 link1 = TREE_CHAIN (link1))
2878 if (!compare_constant (TREE_VALUE (link1), TREE_VALUE (link2)))
2880 link2 = TREE_CHAIN (link2);
2888 VEC(constructor_elt, gc) *v1, *v2;
2889 unsigned HOST_WIDE_INT idx;
2891 typecode = TREE_CODE (TREE_TYPE (t1));
2892 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2895 if (typecode == ARRAY_TYPE)
2897 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
2898 /* For arrays, check that the sizes all match. */
2899 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
2901 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
2906 /* For record and union constructors, require exact type
2908 if (TREE_TYPE (t1) != TREE_TYPE (t2))
2912 v1 = CONSTRUCTOR_ELTS (t1);
2913 v2 = CONSTRUCTOR_ELTS (t2);
2914 if (VEC_length (constructor_elt, v1)
2915 != VEC_length (constructor_elt, v2))
2918 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
2920 constructor_elt *c1 = VEC_index (constructor_elt, v1, idx);
2921 constructor_elt *c2 = VEC_index (constructor_elt, v2, idx);
2923 /* Check that each value is the same... */
2924 if (!compare_constant (c1->value, c2->value))
2926 /* ... and that they apply to the same fields! */
2927 if (typecode == ARRAY_TYPE)
2929 if (!compare_constant (c1->index, c2->index))
2934 if (c1->index != c2->index)
2945 struct addr_const value1, value2;
2949 decode_addr_const (t1, &value1);
2950 decode_addr_const (t2, &value2);
2952 if (value1.offset != value2.offset)
2955 code = GET_CODE (value1.base);
2956 if (code != GET_CODE (value2.base))
2962 ret = (strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
2966 ret = (CODE_LABEL_NUMBER (XEXP (value1.base, 0))
2967 == CODE_LABEL_NUMBER (XEXP (value2.base, 0)));
2977 case POINTER_PLUS_EXPR:
2980 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
2981 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
2984 case VIEW_CONVERT_EXPR:
2985 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
2994 /* Make a copy of the whole tree structure for a constant. This
2995 handles the same types of nodes that compare_constant handles. */
2998 copy_constant (tree exp)
3000 switch (TREE_CODE (exp))
3003 /* For ADDR_EXPR, we do not want to copy the decl whose address
3004 is requested. We do want to copy constants though. */
3005 if (CONSTANT_CLASS_P (TREE_OPERAND (exp, 0)))
3006 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3007 copy_constant (TREE_OPERAND (exp, 0)));
3009 return copy_node (exp);
3015 return copy_node (exp);
3018 return build_complex (TREE_TYPE (exp),
3019 copy_constant (TREE_REALPART (exp)),
3020 copy_constant (TREE_IMAGPART (exp)));
3023 case POINTER_PLUS_EXPR:
3025 return build2 (TREE_CODE (exp), TREE_TYPE (exp),
3026 copy_constant (TREE_OPERAND (exp, 0)),
3027 copy_constant (TREE_OPERAND (exp, 1)));
3030 case VIEW_CONVERT_EXPR:
3031 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
3032 copy_constant (TREE_OPERAND (exp, 0)));
3035 return build_vector (TREE_TYPE (exp),
3036 copy_list (TREE_VECTOR_CST_ELTS (exp)));
3040 tree copy = copy_node (exp);
3041 VEC(constructor_elt, gc) *v;
3042 unsigned HOST_WIDE_INT idx;
3043 tree purpose, value;
3045 v = VEC_alloc(constructor_elt, gc, VEC_length(constructor_elt,
3046 CONSTRUCTOR_ELTS (exp)));
3047 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, purpose, value)
3049 constructor_elt *ce = VEC_quick_push (constructor_elt, v, NULL);
3050 ce->index = purpose;
3051 ce->value = copy_constant (value);
3053 CONSTRUCTOR_ELTS (copy) = v;
3062 /* Return the section into which constant EXP should be placed. */
3065 get_constant_section (tree exp, unsigned int align)
3067 return targetm.asm_out.select_section (exp,
3068 compute_reloc_for_constant (exp),
3072 /* Return the size of constant EXP in bytes. */
3074 static HOST_WIDE_INT
3075 get_constant_size (tree exp)
3079 size = int_size_in_bytes (TREE_TYPE (exp));
3080 if (TREE_CODE (exp) == STRING_CST)
3081 size = MAX (TREE_STRING_LENGTH (exp), size);
3085 /* Subroutine of output_constant_def:
3086 No constant equal to EXP is known to have been output.
3087 Make a constant descriptor to enter EXP in the hash table.
3088 Assign the label number and construct RTL to refer to the
3089 constant's location in memory.
3090 Caller is responsible for updating the hash table. */
3092 static struct constant_descriptor_tree *
3093 build_constant_desc (tree exp)
3095 struct constant_descriptor_tree *desc;
3101 desc = ggc_alloc_constant_descriptor_tree ();
3102 desc->value = copy_constant (exp);
3104 /* Propagate marked-ness to copied constant. */
3105 if (flag_mudflap && mf_marked_p (exp))
3106 mf_mark (desc->value);
3108 /* Create a string containing the label name, in LABEL. */
3109 labelno = const_labelno++;
3110 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
3112 /* Construct the VAR_DECL associated with the constant. */
3113 decl = build_decl (UNKNOWN_LOCATION, VAR_DECL, get_identifier (label),
3115 DECL_ARTIFICIAL (decl) = 1;
3116 DECL_IGNORED_P (decl) = 1;
3117 TREE_READONLY (decl) = 1;
3118 TREE_STATIC (decl) = 1;
3119 TREE_ADDRESSABLE (decl) = 1;
3120 /* We don't set the RTL yet as this would cause varpool to assume that the
3121 variable is referenced. Moreover, it would just be dropped in LTO mode.
3122 Instead we set the flag that will be recognized in make_decl_rtl. */
3123 DECL_IN_CONSTANT_POOL (decl) = 1;
3124 DECL_INITIAL (decl) = desc->value;
3125 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3126 architectures so use DATA_ALIGNMENT as well, except for strings. */
3127 if (TREE_CODE (exp) == STRING_CST)
3129 #ifdef CONSTANT_ALIGNMENT
3130 DECL_ALIGN (decl) = CONSTANT_ALIGNMENT (exp, DECL_ALIGN (decl));
3134 align_variable (decl, 0);
3136 /* Now construct the SYMBOL_REF and the MEM. */
3137 if (use_object_blocks_p ())
3139 section *sect = get_constant_section (exp, DECL_ALIGN (decl));
3140 symbol = create_block_symbol (ggc_strdup (label),
3141 get_block_for_section (sect), -1);
3144 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3145 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3146 SET_SYMBOL_REF_DECL (symbol, decl);
3147 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3149 rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
3150 set_mem_attributes (rtl, exp, 1);
3151 set_mem_alias_set (rtl, 0);
3152 set_mem_alias_set (rtl, const_alias_set);
3154 /* We cannot share RTX'es in pool entries.
3155 Mark this piece of RTL as required for unsharing. */
3156 RTX_FLAG (rtl, used) = 1;
3158 /* Set flags or add text to the name to record information, such as
3159 that it is a local symbol. If the name is changed, the macro
3160 ASM_OUTPUT_LABELREF will have to know how to strip this
3161 information. This call might invalidate our local variable
3162 SYMBOL; we can't use it afterward. */
3163 targetm.encode_section_info (exp, rtl, true);
3170 /* Return an rtx representing a reference to constant data in memory
3171 for the constant expression EXP.
3173 If assembler code for such a constant has already been output,
3174 return an rtx to refer to it.
3175 Otherwise, output such a constant in memory
3176 and generate an rtx for it.
3178 If DEFER is nonzero, this constant can be deferred and output only
3179 if referenced in the function after all optimizations.
3181 `const_desc_table' records which constants already have label strings. */
3184 output_constant_def (tree exp, int defer)
3186 struct constant_descriptor_tree *desc;
3187 struct constant_descriptor_tree key;
3190 /* Look up EXP in the table of constant descriptors. If we didn't find
3191 it, create a new one. */
3193 key.hash = const_hash_1 (exp);
3194 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
3196 desc = (struct constant_descriptor_tree *) *loc;
3199 desc = build_constant_desc (exp);
3200 desc->hash = key.hash;
3204 maybe_output_constant_def_contents (desc, defer);
3208 /* Subroutine of output_constant_def: Decide whether or not we need to
3209 output the constant DESC now, and if so, do it. */
3211 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
3214 rtx symbol = XEXP (desc->rtl, 0);
3215 tree exp = desc->value;
3217 if (flag_syntax_only)
3220 if (TREE_ASM_WRITTEN (exp))
3221 /* Already output; don't do it again. */
3224 /* We can always defer constants as long as the context allows
3228 /* Increment n_deferred_constants if it exists. It needs to be at
3229 least as large as the number of constants actually referred to
3230 by the function. If it's too small we'll stop looking too early
3231 and fail to emit constants; if it's too large we'll only look
3232 through the entire function when we could have stopped earlier. */
3234 n_deferred_constants++;
3238 output_constant_def_contents (symbol);
3241 /* Subroutine of output_constant_def_contents. Output the definition
3242 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3243 constant's alignment in bits. */
3246 assemble_constant_contents (tree exp, const char *label, unsigned int align)
3250 size = get_constant_size (exp);
3252 /* Do any machine/system dependent processing of the constant. */
3253 targetm.asm_out.declare_constant_name (asm_out_file, label, exp, size);
3255 /* Output the value of EXP. */
3256 output_constant (exp, size, align);
3259 /* We must output the constant data referred to by SYMBOL; do so. */
3262 output_constant_def_contents (rtx symbol)
3264 tree decl = SYMBOL_REF_DECL (symbol);
3265 tree exp = DECL_INITIAL (decl);
3268 /* Make sure any other constants whose addresses appear in EXP
3269 are assigned label numbers. */
3270 output_addressed_constants (exp);
3272 /* We are no longer deferring this constant. */
3273 TREE_ASM_WRITTEN (decl) = TREE_ASM_WRITTEN (exp) = 1;
3275 /* If the constant is part of an object block, make sure that the
3276 decl has been positioned within its block, but do not write out
3277 its definition yet. output_object_blocks will do that later. */
3278 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
3279 place_block_symbol (symbol);
3282 align = DECL_ALIGN (decl);
3283 switch_to_section (get_constant_section (exp, align));
3284 if (align > BITS_PER_UNIT)
3285 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
3286 assemble_constant_contents (exp, XSTR (symbol, 0), align);
3289 mudflap_enqueue_constant (exp);
3292 /* Look up EXP in the table of constant descriptors. Return the rtl
3293 if it has been emitted, else null. */
3296 lookup_constant_def (tree exp)
3298 struct constant_descriptor_tree *desc;
3299 struct constant_descriptor_tree key;
3302 key.hash = const_hash_1 (exp);
3303 desc = (struct constant_descriptor_tree *)
3304 htab_find_with_hash (const_desc_htab, &key, key.hash);
3306 return (desc ? desc->rtl : NULL_RTX);
3309 /* Return a tree representing a reference to constant data in memory
3310 for the constant expression EXP.
3312 This is the counterpart of output_constant_def at the Tree level. */
3315 tree_output_constant_def (tree exp)
3317 struct constant_descriptor_tree *desc, key;
3321 /* Look up EXP in the table of constant descriptors. If we didn't find
3322 it, create a new one. */
3324 key.hash = const_hash_1 (exp);
3325 loc = htab_find_slot_with_hash (const_desc_htab, &key, key.hash, INSERT);
3327 desc = (struct constant_descriptor_tree *) *loc;
3330 desc = build_constant_desc (exp);
3331 desc->hash = key.hash;
3335 decl = SYMBOL_REF_DECL (XEXP (desc->rtl, 0));
3336 varpool_finalize_decl (decl);
3340 /* Used in the hash tables to avoid outputting the same constant
3341 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3342 are output once per function, not once per file. */
3343 /* ??? Only a few targets need per-function constant pools. Most
3344 can use one per-file pool. Should add a targetm bit to tell the
3347 struct GTY(()) rtx_constant_pool {
3348 /* Pointers to first and last constant in pool, as ordered by offset. */
3349 struct constant_descriptor_rtx *first;
3350 struct constant_descriptor_rtx *last;
3352 /* Hash facility for making memory-constants from constant rtl-expressions.
3353 It is used on RISC machines where immediate integer arguments and
3354 constant addresses are restricted so that such constants must be stored
3356 htab_t GTY((param_is (struct constant_descriptor_rtx))) const_rtx_htab;
3358 /* Current offset in constant pool (does not include any
3359 machine-specific header). */
3360 HOST_WIDE_INT offset;
3363 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx {
3364 struct constant_descriptor_rtx *next;
3368 HOST_WIDE_INT offset;
3370 enum machine_mode mode;
3376 /* Hash and compare functions for const_rtx_htab. */
3379 const_desc_rtx_hash (const void *ptr)
3381 const struct constant_descriptor_rtx *const desc
3382 = (const struct constant_descriptor_rtx *) ptr;
3387 const_desc_rtx_eq (const void *a, const void *b)
3389 const struct constant_descriptor_rtx *const x
3390 = (const struct constant_descriptor_rtx *) a;
3391 const struct constant_descriptor_rtx *const y
3392 = (const struct constant_descriptor_rtx *) b;
3394 if (x->mode != y->mode)
3396 return rtx_equal_p (x->constant, y->constant);
3399 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3402 const_rtx_hash_1 (rtx *xp, void *data)
3404 unsigned HOST_WIDE_INT hwi;
3405 enum machine_mode mode;
3411 code = GET_CODE (x);
3412 mode = GET_MODE (x);
3413 h = (hashval_t) code * 1048573 + mode;
3421 int shift = sizeof (hashval_t) * CHAR_BIT;
3422 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3425 h ^= (hashval_t) hwi;
3426 for (i = 1; i < n; ++i)
3429 h ^= (hashval_t) hwi;
3435 if (mode == VOIDmode)
3437 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3441 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3445 h ^= fixed_hash (CONST_FIXED_VALUE (x));
3451 for (i = XVECLEN (x, 0); i-- > 0; )
3452 h = h * 251 + const_rtx_hash_1 (&XVECEXP (x, 0, i), data);
3457 h ^= htab_hash_string (XSTR (x, 0));
3461 h = h * 251 + CODE_LABEL_NUMBER (XEXP (x, 0));
3465 case UNSPEC_VOLATILE:
3466 h = h * 251 + XINT (x, 1);
3473 hp = (hashval_t *) data;
3474 *hp = *hp * 509 + h;
3478 /* Compute a hash value for X, which should be a constant. */
3481 const_rtx_hash (rtx x)
3484 for_each_rtx (&x, const_rtx_hash_1, &h);
3489 /* Create and return a new rtx constant pool. */
3491 static struct rtx_constant_pool *
3492 create_constant_pool (void)
3494 struct rtx_constant_pool *pool;
3496 pool = ggc_alloc_rtx_constant_pool ();
3497 pool->const_rtx_htab = htab_create_ggc (31, const_desc_rtx_hash,
3498 const_desc_rtx_eq, NULL);
3505 /* Initialize constant pool hashing for a new function. */
3508 init_varasm_status (void)
3510 crtl->varasm.pool = create_constant_pool ();
3511 crtl->varasm.deferred_constants = 0;
3514 /* Given a MINUS expression, simplify it if both sides
3515 include the same symbol. */
3518 simplify_subtraction (rtx x)
3520 rtx r = simplify_rtx (x);
3524 /* Given a constant rtx X, make (or find) a memory constant for its value
3525 and return a MEM rtx to refer to it in memory. */
3528 force_const_mem (enum machine_mode mode, rtx x)
3530 struct constant_descriptor_rtx *desc, tmp;
3531 struct rtx_constant_pool *pool;
3538 /* If we're not allowed to drop X into the constant pool, don't. */
3539 if (targetm.cannot_force_const_mem (x))
3542 /* Record that this function has used a constant pool entry. */
3543 crtl->uses_const_pool = 1;
3545 /* Decide which pool to use. */
3546 pool = (targetm.use_blocks_for_constant_p (mode, x)
3547 ? shared_constant_pool
3548 : crtl->varasm.pool);
3550 /* Lookup the value in the hashtable. */
3553 hash = const_rtx_hash (x);
3554 slot = htab_find_slot_with_hash (pool->const_rtx_htab, &tmp, hash, INSERT);
3555 desc = (struct constant_descriptor_rtx *) *slot;
3557 /* If the constant was already present, return its memory. */
3559 return copy_rtx (desc->mem);
3561 /* Otherwise, create a new descriptor. */
3562 desc = ggc_alloc_constant_descriptor_rtx ();
3565 /* Align the location counter as required by EXP's data type. */
3566 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3567 #ifdef CONSTANT_ALIGNMENT
3569 tree type = lang_hooks.types.type_for_mode (mode, 0);
3570 if (type != NULL_TREE)
3571 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3575 pool->offset += (align / BITS_PER_UNIT) - 1;
3576 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3579 desc->constant = copy_rtx (tmp.constant);
3580 desc->offset = pool->offset;
3583 desc->align = align;
3584 desc->labelno = const_labelno;
3587 pool->offset += GET_MODE_SIZE (mode);
3589 pool->last->next = desc;
3591 pool->first = pool->last = desc;
3594 /* Create a string containing the label name, in LABEL. */
3595 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3598 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3599 the constants pool. */
3600 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3602 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3603 symbol = create_block_symbol (ggc_strdup (label),
3604 get_block_for_section (sect), -1);
3607 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3609 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3610 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3611 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3613 /* Construct the MEM. */
3614 desc->mem = def = gen_const_mem (mode, symbol);
3615 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3616 set_mem_align (def, align);
3618 /* If we're dropping a label to the constant pool, make sure we
3620 if (GET_CODE (x) == LABEL_REF)
3621 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3623 return copy_rtx (def);
3626 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3629 get_pool_constant (rtx addr)
3631 return SYMBOL_REF_CONSTANT (addr)->constant;
3634 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3635 and whether it has been output or not. */
3638 get_pool_constant_mark (rtx addr, bool *pmarked)
3640 struct constant_descriptor_rtx *desc;
3642 desc = SYMBOL_REF_CONSTANT (addr);
3643 *pmarked = (desc->mark != 0);
3644 return desc->constant;
3647 /* Similar, return the mode. */
3650 get_pool_mode (const_rtx addr)
3652 return SYMBOL_REF_CONSTANT (addr)->mode;
3655 /* Return the size of the constant pool. */
3658 get_pool_size (void)
3660 return crtl->varasm.pool->offset;
3663 /* Worker function for output_constant_pool_1. Emit assembly for X
3664 in MODE with known alignment ALIGN. */
3667 output_constant_pool_2 (enum machine_mode mode, rtx x, unsigned int align)
3669 switch (GET_MODE_CLASS (mode))
3672 case MODE_DECIMAL_FLOAT:
3676 gcc_assert (GET_CODE (x) == CONST_DOUBLE);
3677 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3678 assemble_real (r, mode, align);
3683 case MODE_PARTIAL_INT:
3688 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3691 case MODE_VECTOR_FLOAT:
3692 case MODE_VECTOR_INT:
3693 case MODE_VECTOR_FRACT:
3694 case MODE_VECTOR_UFRACT:
3695 case MODE_VECTOR_ACCUM:
3696 case MODE_VECTOR_UACCUM:
3699 enum machine_mode submode = GET_MODE_INNER (mode);
3700 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3702 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3703 units = CONST_VECTOR_NUNITS (x);
3705 for (i = 0; i < units; i++)
3707 rtx elt = CONST_VECTOR_ELT (x, i);
3708 output_constant_pool_2 (submode, elt, i ? subalign : align);
3718 /* Worker function for output_constant_pool. Emit constant DESC,
3719 giving it ALIGN bits of alignment. */
3722 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3729 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3730 whose CODE_LABEL has been deleted. This can occur if a jump table
3731 is eliminated by optimization. If so, write a constant of zero
3732 instead. Note that this can also happen by turning the
3733 CODE_LABEL into a NOTE. */
3734 /* ??? This seems completely and utterly wrong. Certainly it's
3735 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3736 functioning even with INSN_DELETED_P and friends. */
3739 switch (GET_CODE (tmp))
3742 if (GET_CODE (XEXP (tmp, 0)) != PLUS
3743 || GET_CODE (XEXP (XEXP (tmp, 0), 0)) != LABEL_REF)
3745 tmp = XEXP (XEXP (tmp, 0), 0);
3749 tmp = XEXP (tmp, 0);
3750 gcc_assert (!INSN_DELETED_P (tmp));
3751 gcc_assert (!NOTE_P (tmp)
3752 || NOTE_KIND (tmp) != NOTE_INSN_DELETED);
3759 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3760 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3761 align, desc->labelno, done);
3764 assemble_align (align);
3766 /* Output the label. */
3767 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3769 /* Output the data. */
3770 output_constant_pool_2 (desc->mode, x, align);
3772 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3773 sections have proper size. */
3774 if (align > GET_MODE_BITSIZE (desc->mode)
3776 && (in_section->common.flags & SECTION_MERGE))
3777 assemble_align (align);
3779 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3785 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3786 to as used. Emit referenced deferred strings. This function can
3787 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3790 mark_constant (rtx *current_rtx, void *data ATTRIBUTE_UNUSED)
3792 rtx x = *current_rtx;
3794 if (x == NULL_RTX || GET_CODE (x) != SYMBOL_REF)
3797 if (CONSTANT_POOL_ADDRESS_P (x))
3799 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3800 if (desc->mark == 0)
3803 for_each_rtx (&desc->constant, mark_constant, NULL);
3806 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3808 tree decl = SYMBOL_REF_DECL (x);
3809 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl)))
3811 n_deferred_constants--;
3812 output_constant_def_contents (x);
3819 /* Look through appropriate parts of INSN, marking all entries in the
3820 constant pool which are actually being used. Entries that are only
3821 referenced by other constants are also marked as used. Emit
3822 deferred strings that are used. */
3825 mark_constants (rtx insn)
3830 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3831 insns, not any notes that may be attached. We don't want to mark
3832 a constant just because it happens to appear in a REG_EQUIV note. */
3833 if (GET_CODE (PATTERN (insn)) == SEQUENCE)
3835 rtx seq = PATTERN (insn);
3836 int i, n = XVECLEN (seq, 0);
3837 for (i = 0; i < n; ++i)
3839 rtx subinsn = XVECEXP (seq, 0, i);
3840 if (INSN_P (subinsn))
3841 for_each_rtx (&PATTERN (subinsn), mark_constant, NULL);
3845 for_each_rtx (&PATTERN (insn), mark_constant, NULL);
3848 /* Look through the instructions for this function, and mark all the
3849 entries in POOL which are actually being used. Emit deferred constants
3850 which have indeed been used. */
3853 mark_constant_pool (void)
3857 if (!crtl->uses_const_pool && n_deferred_constants == 0)
3860 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3861 mark_constants (insn);
3863 for (link = crtl->epilogue_delay_list;
3865 link = XEXP (link, 1))
3866 mark_constants (XEXP (link, 0));
3869 /* Write all the constants in POOL. */
3872 output_constant_pool_contents (struct rtx_constant_pool *pool)
3874 struct constant_descriptor_rtx *desc;
3876 for (desc = pool->first; desc ; desc = desc->next)
3879 /* If the constant is part of an object_block, make sure that
3880 the constant has been positioned within its block, but do not
3881 write out its definition yet. output_object_blocks will do
3883 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
3884 && SYMBOL_REF_BLOCK (desc->sym))
3885 place_block_symbol (desc->sym);
3888 switch_to_section (targetm.asm_out.select_rtx_section
3889 (desc->mode, desc->constant, desc->align));
3890 output_constant_pool_1 (desc, desc->align);
3895 /* Mark all constants that are used in the current function, then write
3896 out the function's private constant pool. */
3899 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
3900 tree fndecl ATTRIBUTE_UNUSED)
3902 struct rtx_constant_pool *pool = crtl->varasm.pool;
3904 /* It is possible for gcc to call force_const_mem and then to later
3905 discard the instructions which refer to the constant. In such a
3906 case we do not need to output the constant. */
3907 mark_constant_pool ();
3909 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3910 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
3913 output_constant_pool_contents (pool);
3915 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3916 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
3920 /* Write the contents of the shared constant pool. */
3923 output_shared_constant_pool (void)
3925 output_constant_pool_contents (shared_constant_pool);
3928 /* Determine what kind of relocations EXP may need. */
3931 compute_reloc_for_constant (tree exp)
3933 int reloc = 0, reloc2;
3936 switch (TREE_CODE (exp))
3940 /* Go inside any operations that get_inner_reference can handle and see
3941 if what's inside is a constant: no need to do anything here for
3942 addresses of variables or functions. */
3943 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3944 tem = TREE_OPERAND (tem, 0))
3947 if (TREE_CODE (tem) == MEM_REF
3948 && TREE_CODE (TREE_OPERAND (tem, 0)) == ADDR_EXPR)
3950 reloc = compute_reloc_for_constant (TREE_OPERAND (tem, 0));
3954 if (TREE_PUBLIC (tem))
3961 case POINTER_PLUS_EXPR:
3962 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3963 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3967 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3968 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
3969 /* The difference of two local labels is computable at link time. */
3970 if (reloc == 1 && reloc2 == 1)
3977 case VIEW_CONVERT_EXPR:
3978 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
3983 unsigned HOST_WIDE_INT idx;
3984 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
3986 reloc |= compute_reloc_for_constant (tem);
3996 /* Find all the constants whose addresses are referenced inside of EXP,
3997 and make sure assembler code with a label has been output for each one.
3998 Indicate whether an ADDR_EXPR has been encountered. */
4001 output_addressed_constants (tree exp)
4005 switch (TREE_CODE (exp))
4009 /* Go inside any operations that get_inner_reference can handle and see
4010 if what's inside is a constant: no need to do anything here for
4011 addresses of variables or functions. */
4012 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
4013 tem = TREE_OPERAND (tem, 0))
4016 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4017 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
4018 tem = DECL_INITIAL (tem);
4020 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
4021 output_constant_def (tem, 0);
4023 if (TREE_CODE (tem) == MEM_REF)
4024 output_addressed_constants (TREE_OPERAND (tem, 0));
4028 case POINTER_PLUS_EXPR:
4030 output_addressed_constants (TREE_OPERAND (exp, 1));
4034 case VIEW_CONVERT_EXPR:
4035 output_addressed_constants (TREE_OPERAND (exp, 0));
4040 unsigned HOST_WIDE_INT idx;
4041 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
4043 output_addressed_constants (tem);
4052 /* Whether a constructor CTOR is a valid static constant initializer if all
4053 its elements are. This used to be internal to initializer_constant_valid_p
4054 and has been exposed to let other functions like categorize_ctor_elements
4055 evaluate the property while walking a constructor for other purposes. */
4058 constructor_static_from_elts_p (const_tree ctor)
4060 return (TREE_CONSTANT (ctor)
4061 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4062 || TREE_CODE (TREE_TYPE (ctor)) == RECORD_TYPE
4063 || TREE_CODE (TREE_TYPE (ctor)) == ARRAY_TYPE));
4066 static tree initializer_constant_valid_p_1 (tree value, tree endtype,
4069 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4070 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4071 which are valid when ENDTYPE is an integer of any size; in
4072 particular, this does not accept a pointer minus a constant. This
4073 returns null_pointer_node if the VALUE is an absolute constant
4074 which can be used to initialize a static variable. Otherwise it
4078 narrowing_initializer_constant_valid_p (tree value, tree endtype, tree *cache)
4082 if (!INTEGRAL_TYPE_P (endtype))
4085 op0 = TREE_OPERAND (value, 0);
4086 op1 = TREE_OPERAND (value, 1);
4088 /* Like STRIP_NOPS except allow the operand mode to widen. This
4089 works around a feature of fold that simplifies (int)(p1 - p2) to
4090 ((int)p1 - (int)p2) under the theory that the narrower operation
4093 while (CONVERT_EXPR_P (op0)
4094 || TREE_CODE (op0) == NON_LVALUE_EXPR)
4096 tree inner = TREE_OPERAND (op0, 0);
4097 if (inner == error_mark_node
4098 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4099 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
4100 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4105 while (CONVERT_EXPR_P (op1)
4106 || TREE_CODE (op1) == NON_LVALUE_EXPR)
4108 tree inner = TREE_OPERAND (op1, 0);
4109 if (inner == error_mark_node
4110 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4111 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
4112 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4117 op0 = initializer_constant_valid_p_1 (op0, endtype, cache);
4121 op1 = initializer_constant_valid_p_1 (op1, endtype,
4122 cache ? cache + 2 : NULL);
4123 /* Both initializers must be known. */
4127 && (op0 == null_pointer_node
4128 || TREE_CODE (value) == MINUS_EXPR))
4129 return null_pointer_node;
4131 /* Support differences between labels. */
4132 if (TREE_CODE (op0) == LABEL_DECL
4133 && TREE_CODE (op1) == LABEL_DECL)
4134 return null_pointer_node;
4136 if (TREE_CODE (op0) == STRING_CST
4137 && TREE_CODE (op1) == STRING_CST
4138 && operand_equal_p (op0, op1, 1))
4139 return null_pointer_node;
4145 /* Helper function of initializer_constant_valid_p.
4146 Return nonzero if VALUE is a valid constant-valued expression
4147 for use in initializing a static variable; one that can be an
4148 element of a "constant" initializer.
4150 Return null_pointer_node if the value is absolute;
4151 if it is relocatable, return the variable that determines the relocation.
4152 We assume that VALUE has been folded as much as possible;
4153 therefore, we do not need to check for such things as
4154 arithmetic-combinations of integers.
4156 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4159 initializer_constant_valid_p_1 (tree value, tree endtype, tree *cache)
4163 switch (TREE_CODE (value))
4166 if (constructor_static_from_elts_p (value))
4168 unsigned HOST_WIDE_INT idx;
4170 bool absolute = true;
4172 if (cache && cache[0] == value)
4174 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4177 reloc = initializer_constant_valid_p_1 (elt, TREE_TYPE (elt),
4184 cache[1] = NULL_TREE;
4188 if (reloc != null_pointer_node)
4191 /* For a non-absolute relocation, there is no single
4192 variable that can be "the variable that determines the
4197 cache[1] = absolute ? null_pointer_node : error_mark_node;
4199 return absolute ? null_pointer_node : error_mark_node;
4202 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
4210 return null_pointer_node;
4215 tree op0 = staticp (TREE_OPERAND (value, 0));
4218 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4219 to be a constant, this is old-skool offsetof-like nonsense. */
4220 if (TREE_CODE (op0) == INDIRECT_REF
4221 && TREE_CONSTANT (TREE_OPERAND (op0, 0)))
4222 return null_pointer_node;
4223 /* Taking the address of a nested function involves a trampoline,
4224 unless we don't need or want one. */
4225 if (TREE_CODE (op0) == FUNCTION_DECL
4226 && DECL_STATIC_CHAIN (op0)
4227 && !TREE_NO_TRAMPOLINE (value))
4229 /* "&{...}" requires a temporary to hold the constructed
4231 if (TREE_CODE (op0) == CONSTRUCTOR)
4237 case NON_LVALUE_EXPR:
4238 return initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4241 case VIEW_CONVERT_EXPR:
4243 tree src = TREE_OPERAND (value, 0);
4244 tree src_type = TREE_TYPE (src);
4245 tree dest_type = TREE_TYPE (value);
4247 /* Allow view-conversions from aggregate to non-aggregate type only
4248 if the bit pattern is fully preserved afterwards; otherwise, the
4249 RTL expander won't be able to apply a subsequent transformation
4250 to the underlying constructor. */
4251 if (AGGREGATE_TYPE_P (src_type) && !AGGREGATE_TYPE_P (dest_type))
4253 if (TYPE_MODE (endtype) == TYPE_MODE (dest_type))
4254 return initializer_constant_valid_p_1 (src, endtype, cache);
4259 /* Allow all other kinds of view-conversion. */
4260 return initializer_constant_valid_p_1 (src, endtype, cache);
4265 tree src = TREE_OPERAND (value, 0);
4266 tree src_type = TREE_TYPE (src);
4267 tree dest_type = TREE_TYPE (value);
4269 /* Allow conversions between pointer types, floating-point
4270 types, and offset types. */
4271 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
4272 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
4273 || (TREE_CODE (dest_type) == OFFSET_TYPE
4274 && TREE_CODE (src_type) == OFFSET_TYPE))
4275 return initializer_constant_valid_p_1 (src, endtype, cache);
4277 /* Allow length-preserving conversions between integer types. */
4278 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
4279 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
4280 return initializer_constant_valid_p_1 (src, endtype, cache);
4282 /* Allow conversions between other integer types only if
4284 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
4286 tree inner = initializer_constant_valid_p_1 (src, endtype, cache);
4287 if (inner == null_pointer_node)
4288 return null_pointer_node;
4292 /* Allow (int) &foo provided int is as wide as a pointer. */
4293 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
4294 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
4295 return initializer_constant_valid_p_1 (src, endtype, cache);
4297 /* Likewise conversions from int to pointers, but also allow
4298 conversions from 0. */
4299 if ((POINTER_TYPE_P (dest_type)
4300 || TREE_CODE (dest_type) == OFFSET_TYPE)
4301 && INTEGRAL_TYPE_P (src_type))
4303 if (TREE_CODE (src) == INTEGER_CST
4304 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
4305 return null_pointer_node;
4306 if (integer_zerop (src))
4307 return null_pointer_node;
4308 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
4309 return initializer_constant_valid_p_1 (src, endtype, cache);
4312 /* Allow conversions to struct or union types if the value
4314 if (TREE_CODE (dest_type) == RECORD_TYPE
4315 || TREE_CODE (dest_type) == UNION_TYPE)
4316 return initializer_constant_valid_p_1 (src, endtype, cache);
4320 case POINTER_PLUS_EXPR:
4322 /* Any valid floating-point constants will have been folded by now;
4323 with -frounding-math we hit this with addition of two constants. */
4324 if (TREE_CODE (endtype) == REAL_TYPE)
4326 if (cache && cache[0] == value)
4328 if (! INTEGRAL_TYPE_P (endtype)
4329 || TYPE_PRECISION (endtype) >= TYPE_PRECISION (TREE_TYPE (value)))
4331 tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
4333 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4336 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 1),
4337 endtype, ncache + 2);
4338 /* If either term is absolute, use the other term's relocation. */
4339 if (valid0 == null_pointer_node)
4341 else if (valid1 == null_pointer_node)
4343 /* Support narrowing pointer differences. */
4345 ret = narrowing_initializer_constant_valid_p (value, endtype,
4349 /* Support narrowing pointer differences. */
4350 ret = narrowing_initializer_constant_valid_p (value, endtype, NULL);
4359 if (TREE_CODE (endtype) == REAL_TYPE)
4361 if (cache && cache[0] == value)
4363 if (! INTEGRAL_TYPE_P (endtype)
4364 || TYPE_PRECISION (endtype) >= TYPE_PRECISION (TREE_TYPE (value)))
4366 tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
4368 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4371 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 1),
4372 endtype, ncache + 2);
4373 /* Win if second argument is absolute. */
4374 if (valid1 == null_pointer_node)
4376 /* Win if both arguments have the same relocation.
4377 Then the value is absolute. */
4378 else if (valid0 == valid1 && valid0 != 0)
4379 ret = null_pointer_node;
4380 /* Since GCC guarantees that string constants are unique in the
4381 generated code, a subtraction between two copies of the same
4382 constant string is absolute. */
4383 else if (valid0 && TREE_CODE (valid0) == STRING_CST
4384 && valid1 && TREE_CODE (valid1) == STRING_CST
4385 && operand_equal_p (valid0, valid1, 1))
4386 ret = null_pointer_node;
4387 /* Support narrowing differences. */
4389 ret = narrowing_initializer_constant_valid_p (value, endtype,
4393 /* Support narrowing differences. */
4394 ret = narrowing_initializer_constant_valid_p (value, endtype, NULL);
4409 /* Return nonzero if VALUE is a valid constant-valued expression
4410 for use in initializing a static variable; one that can be an
4411 element of a "constant" initializer.
4413 Return null_pointer_node if the value is absolute;
4414 if it is relocatable, return the variable that determines the relocation.
4415 We assume that VALUE has been folded as much as possible;
4416 therefore, we do not need to check for such things as
4417 arithmetic-combinations of integers. */
4419 initializer_constant_valid_p (tree value, tree endtype)
4421 return initializer_constant_valid_p_1 (value, endtype, NULL);
4424 /* Return true if VALUE is a valid constant-valued expression
4425 for use in initializing a static bit-field; one that can be
4426 an element of a "constant" initializer. */
4429 initializer_constant_valid_for_bitfield_p (tree value)
4431 /* For bitfields we support integer constants or possibly nested aggregates
4433 switch (TREE_CODE (value))
4437 unsigned HOST_WIDE_INT idx;
4440 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4441 if (!initializer_constant_valid_for_bitfield_p (elt))
4449 case VIEW_CONVERT_EXPR:
4450 case NON_LVALUE_EXPR:
4452 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value, 0));
4461 /* output_constructor outer state of relevance in recursive calls, typically
4462 for nested aggregate bitfields. */
4465 unsigned int bit_offset; /* current position in ... */
4466 int byte; /* ... the outer byte buffer. */
4469 static unsigned HOST_WIDE_INT
4470 output_constructor (tree, unsigned HOST_WIDE_INT, unsigned int,
4473 /* Output assembler code for constant EXP to FILE, with no label.
4474 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4475 Assumes output_addressed_constants has been done on EXP already.
4477 Generate exactly SIZE bytes of assembler data, padding at the end
4478 with zeros if necessary. SIZE must always be specified.
4480 SIZE is important for structure constructors,
4481 since trailing members may have been omitted from the constructor.
4482 It is also important for initialization of arrays from string constants
4483 since the full length of the string constant might not be wanted.
4484 It is also needed for initialization of unions, where the initializer's
4485 type is just one member, and that may not be as long as the union.
4487 There a case in which we would fail to output exactly SIZE bytes:
4488 for a structure constructor that wants to produce more than SIZE bytes.
4489 But such constructors will never be generated for any possible input.
4491 ALIGN is the alignment of the data in bits. */
4494 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
4496 enum tree_code code;
4497 unsigned HOST_WIDE_INT thissize;
4499 if (size == 0 || flag_syntax_only)
4502 /* See if we're trying to initialize a pointer in a non-default mode
4503 to the address of some declaration somewhere. If the target says
4504 the mode is valid for pointers, assume the target has a way of
4506 if (TREE_CODE (exp) == NOP_EXPR
4507 && POINTER_TYPE_P (TREE_TYPE (exp))
4508 && targetm.addr_space.valid_pointer_mode
4509 (TYPE_MODE (TREE_TYPE (exp)),
4510 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp)))))
4512 tree saved_type = TREE_TYPE (exp);
4514 /* Peel off any intermediate conversions-to-pointer for valid
4516 while (TREE_CODE (exp) == NOP_EXPR
4517 && POINTER_TYPE_P (TREE_TYPE (exp))
4518 && targetm.addr_space.valid_pointer_mode
4519 (TYPE_MODE (TREE_TYPE (exp)),
4520 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp)))))
4521 exp = TREE_OPERAND (exp, 0);
4523 /* If what we're left with is the address of something, we can
4524 convert the address to the final type and output it that
4526 if (TREE_CODE (exp) == ADDR_EXPR)
4527 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
4528 /* Likewise for constant ints. */
4529 else if (TREE_CODE (exp) == INTEGER_CST)
4530 exp = build_int_cst_wide (saved_type, TREE_INT_CST_LOW (exp),
4531 TREE_INT_CST_HIGH (exp));
4535 /* Eliminate any conversions since we'll be outputting the underlying
4537 while (CONVERT_EXPR_P (exp)
4538 || TREE_CODE (exp) == NON_LVALUE_EXPR
4539 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4541 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4542 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4544 /* Make sure eliminating the conversion is really a no-op, except with
4545 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4546 union types to allow for Ada unchecked unions. */
4547 if (type_size > op_size
4548 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4549 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4550 /* Keep the conversion. */
4553 exp = TREE_OPERAND (exp, 0);
4556 code = TREE_CODE (TREE_TYPE (exp));
4557 thissize = int_size_in_bytes (TREE_TYPE (exp));
4559 /* Allow a constructor with no elements for any data type.
4560 This means to fill the space with zeros. */
4561 if (TREE_CODE (exp) == CONSTRUCTOR
4562 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (exp)))
4564 assemble_zeros (size);
4568 if (TREE_CODE (exp) == FDESC_EXPR)
4570 #ifdef ASM_OUTPUT_FDESC
4571 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
4572 tree decl = TREE_OPERAND (exp, 0);
4573 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4580 /* Now output the underlying data. If we've handling the padding, return.
4581 Otherwise, break and ensure SIZE is the size written. */
4588 case REFERENCE_TYPE:
4590 case FIXED_POINT_TYPE:
4591 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
4592 EXPAND_INITIALIZER),
4593 MIN (size, thissize), align, 0))
4594 error ("initializer for integer/fixed-point value is too complicated");
4598 if (TREE_CODE (exp) != REAL_CST)
4599 error ("initializer for floating value is not a floating constant");
4601 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)), align);
4605 output_constant (TREE_REALPART (exp), thissize / 2, align);
4606 output_constant (TREE_IMAGPART (exp), thissize / 2,
4607 min_align (align, BITS_PER_UNIT * (thissize / 2)));
4612 switch (TREE_CODE (exp))
4615 output_constructor (exp, size, align, NULL);
4618 thissize = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp),
4620 assemble_string (TREE_STRING_POINTER (exp), thissize);
4627 unsigned int nalign;
4628 enum machine_mode inner;
4630 inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4631 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4633 elt_size = GET_MODE_SIZE (inner);
4635 link = TREE_VECTOR_CST_ELTS (exp);
4636 output_constant (TREE_VALUE (link), elt_size, align);
4637 thissize = elt_size;
4638 while ((link = TREE_CHAIN (link)) != NULL)
4640 output_constant (TREE_VALUE (link), elt_size, nalign);
4641 thissize += elt_size;
4652 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4653 output_constructor (exp, size, align, NULL);
4663 if (size > thissize)
4664 assemble_zeros (size - thissize);
4668 /* Subroutine of output_constructor, used for computing the size of
4669 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4670 type with an unspecified upper bound. */
4672 static unsigned HOST_WIDE_INT
4673 array_size_for_constructor (tree val)
4676 unsigned HOST_WIDE_INT cnt;
4677 tree index, value, tmp;
4679 /* This code used to attempt to handle string constants that are not
4680 arrays of single-bytes, but nothing else does, so there's no point in
4682 if (TREE_CODE (val) == STRING_CST)
4683 return TREE_STRING_LENGTH (val);
4685 max_index = NULL_TREE;
4686 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4688 if (TREE_CODE (index) == RANGE_EXPR)
4689 index = TREE_OPERAND (index, 1);
4690 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4694 if (max_index == NULL_TREE)
4697 /* Compute the total number of array elements. */
4698 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4699 i = size_binop (MINUS_EXPR, fold_convert (sizetype, max_index),
4700 fold_convert (sizetype, tmp));
4701 i = size_binop (PLUS_EXPR, i, size_one_node);
4703 /* Multiply by the array element unit size to find number of bytes. */
4704 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4706 return tree_low_cst (i, 1);
4709 /* Other datastructures + helpers for output_constructor. */
4711 /* output_constructor local state to support interaction with helpers. */
4715 /* Received arguments. */
4716 tree exp; /* Constructor expression. */
4717 unsigned HOST_WIDE_INT size; /* # bytes to output - pad if necessary. */
4718 unsigned int align; /* Known initial alignment. */
4720 /* Constructor expression data. */
4721 tree type; /* Expression type. */
4722 tree field; /* Current field decl in a record. */
4723 tree min_index; /* Lower bound if specified for an array. */
4725 /* Output processing state. */
4726 HOST_WIDE_INT total_bytes; /* # bytes output so far / current position. */
4727 bool byte_buffer_in_use; /* Whether byte ... */
4728 int byte; /* ... contains part of a bitfield byte yet to
4731 int last_relative_index; /* Implicit or explicit index of the last
4732 array element output within a bitfield. */
4733 /* Current element. */
4734 tree val; /* Current element value. */
4735 tree index; /* Current element index. */
4739 /* Helper for output_constructor. From the current LOCAL state, output a
4740 RANGE_EXPR element. */
4743 output_constructor_array_range (oc_local_state *local)
4745 unsigned HOST_WIDE_INT fieldsize
4746 = int_size_in_bytes (TREE_TYPE (local->type));
4748 HOST_WIDE_INT lo_index
4749 = tree_low_cst (TREE_OPERAND (local->index, 0), 0);
4750 HOST_WIDE_INT hi_index
4751 = tree_low_cst (TREE_OPERAND (local->index, 1), 0);
4752 HOST_WIDE_INT index;
4755 = min_align (local->align, fieldsize * BITS_PER_UNIT);
4757 for (index = lo_index; index <= hi_index; index++)
4759 /* Output the element's initial value. */
4760 if (local->val == NULL_TREE)
4761 assemble_zeros (fieldsize);
4763 output_constant (local->val, fieldsize, align2);
4765 /* Count its size. */
4766 local->total_bytes += fieldsize;
4770 /* Helper for output_constructor. From the current LOCAL state, output a
4771 field element that is not true bitfield or part of an outer one. */
4774 output_constructor_regular_field (oc_local_state *local)
4776 /* Field size and position. Since this structure is static, we know the
4777 positions are constant. */
4778 unsigned HOST_WIDE_INT fieldsize;
4779 HOST_WIDE_INT fieldpos;
4781 unsigned int align2;
4783 if (local->index != NULL_TREE)
4784 fieldpos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local->val)), 1)
4785 * ((tree_low_cst (local->index, 0)
4786 - tree_low_cst (local->min_index, 0))));
4787 else if (local->field != NULL_TREE)
4788 fieldpos = int_byte_position (local->field);
4792 /* Output any buffered-up bit-fields preceding this element. */
4793 if (local->byte_buffer_in_use)
4795 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
4796 local->total_bytes++;
4797 local->byte_buffer_in_use = false;
4800 /* Advance to offset of this element.
4801 Note no alignment needed in an array, since that is guaranteed
4802 if each element has the proper size. */
4803 if ((local->field != NULL_TREE || local->index != NULL_TREE)
4804 && fieldpos != local->total_bytes)
4806 gcc_assert (fieldpos >= local->total_bytes);
4807 assemble_zeros (fieldpos - local->total_bytes);
4808 local->total_bytes = fieldpos;
4811 /* Find the alignment of this element. */
4812 align2 = min_align (local->align, BITS_PER_UNIT * fieldpos);
4814 /* Determine size this element should occupy. */
4819 /* If this is an array with an unspecified upper bound,
4820 the initializer determines the size. */
4821 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4822 but we cannot do this until the deprecated support for
4823 initializing zero-length array members is removed. */
4824 if (TREE_CODE (TREE_TYPE (local->field)) == ARRAY_TYPE
4825 && TYPE_DOMAIN (TREE_TYPE (local->field))
4826 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local->field))))
4828 fieldsize = array_size_for_constructor (local->val);
4829 /* Given a non-empty initialization, this field had
4831 gcc_assert (!fieldsize || !DECL_CHAIN (local->field));
4833 else if (DECL_SIZE_UNIT (local->field))
4835 /* ??? This can't be right. If the decl size overflows
4836 a host integer we will silently emit no data. */
4837 if (host_integerp (DECL_SIZE_UNIT (local->field), 1))
4838 fieldsize = tree_low_cst (DECL_SIZE_UNIT (local->field), 1);
4842 fieldsize = int_size_in_bytes (TREE_TYPE (local->type));
4844 /* Output the element's initial value. */
4845 if (local->val == NULL_TREE)
4846 assemble_zeros (fieldsize);
4848 output_constant (local->val, fieldsize, align2);
4850 /* Count its size. */
4851 local->total_bytes += fieldsize;
4854 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4855 output an element that is a true bitfield or part of an outer one. */
4858 output_constructor_bitfield (oc_local_state *local, oc_outer_state *outer)
4860 /* Bit size of this element. */
4861 HOST_WIDE_INT ebitsize
4863 ? tree_low_cst (DECL_SIZE (local->field), 1)
4864 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local->type)), 1));
4866 /* Relative index of this element if this is an array component. */
4867 HOST_WIDE_INT relative_index
4870 ? (tree_low_cst (local->index, 0)
4871 - tree_low_cst (local->min_index, 0))
4872 : local->last_relative_index + 1)
4875 /* Bit position of this element from the start of the containing
4877 HOST_WIDE_INT constructor_relative_ebitpos
4879 ? int_bit_position (local->field)
4880 : ebitsize * relative_index);
4882 /* Bit position of this element from the start of a possibly ongoing
4883 outer byte buffer. */
4884 HOST_WIDE_INT byte_relative_ebitpos
4885 = ((outer ? outer->bit_offset : 0) + constructor_relative_ebitpos);
4887 /* From the start of a possibly ongoing outer byte buffer, offsets to
4888 the first bit of this element and to the first bit past the end of
4890 HOST_WIDE_INT next_offset = byte_relative_ebitpos;
4891 HOST_WIDE_INT end_offset = byte_relative_ebitpos + ebitsize;
4893 local->last_relative_index = relative_index;
4895 if (local->val == NULL_TREE)
4896 local->val = integer_zero_node;
4898 while (TREE_CODE (local->val) == VIEW_CONVERT_EXPR
4899 || TREE_CODE (local->val) == NON_LVALUE_EXPR)
4900 local->val = TREE_OPERAND (local->val, 0);
4902 if (TREE_CODE (local->val) != INTEGER_CST
4903 && TREE_CODE (local->val) != CONSTRUCTOR)
4905 error ("invalid initial value for member %qE", DECL_NAME (local->field));
4909 /* If this field does not start in this (or, next) byte,
4911 if (next_offset / BITS_PER_UNIT != local->total_bytes)
4913 /* Output remnant of any bit field in previous bytes. */
4914 if (local->byte_buffer_in_use)
4916 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
4917 local->total_bytes++;
4918 local->byte_buffer_in_use = false;
4921 /* If still not at proper byte, advance to there. */
4922 if (next_offset / BITS_PER_UNIT != local->total_bytes)
4924 gcc_assert (next_offset / BITS_PER_UNIT >= local->total_bytes);
4925 assemble_zeros (next_offset / BITS_PER_UNIT - local->total_bytes);
4926 local->total_bytes = next_offset / BITS_PER_UNIT;
4930 /* Set up the buffer if necessary. */
4931 if (!local->byte_buffer_in_use)
4935 local->byte_buffer_in_use = true;
4938 /* If this is nested constructor, recurse passing the bit offset and the
4939 pending data, then retrieve the new pending data afterwards. */
4940 if (TREE_CODE (local->val) == CONSTRUCTOR)
4942 oc_outer_state output_state;
4944 output_state.bit_offset = next_offset % BITS_PER_UNIT;
4945 output_state.byte = local->byte;
4947 += output_constructor (local->val, 0, 0, &output_state);
4948 local->byte = output_state.byte;
4952 /* Otherwise, we must split the element into pieces that fall within
4953 separate bytes, and combine each byte with previous or following
4955 while (next_offset < end_offset)
4959 HOST_WIDE_INT value;
4960 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4961 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4963 /* Advance from byte to byte
4964 within this element when necessary. */
4965 while (next_byte != local->total_bytes)
4967 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
4968 local->total_bytes++;
4972 /* Number of bits we can process at once
4973 (all part of the same byte). */
4974 this_time = MIN (end_offset - next_offset,
4975 BITS_PER_UNIT - next_bit);
4976 if (BYTES_BIG_ENDIAN)
4978 /* On big-endian machine, take the most significant bits
4979 first (of the bits that are significant)
4980 and put them into bytes from the most significant end. */
4981 shift = end_offset - next_offset - this_time;
4983 /* Don't try to take a bunch of bits that cross
4984 the word boundary in the INTEGER_CST. We can
4985 only select bits from the LOW or HIGH part
4987 if (shift < HOST_BITS_PER_WIDE_INT
4988 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4990 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
4991 shift = HOST_BITS_PER_WIDE_INT;
4994 /* Now get the bits from the appropriate constant word. */
4995 if (shift < HOST_BITS_PER_WIDE_INT)
4996 value = TREE_INT_CST_LOW (local->val);
4999 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
5000 value = TREE_INT_CST_HIGH (local->val);
5001 shift -= HOST_BITS_PER_WIDE_INT;
5004 /* Get the result. This works only when:
5005 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5006 local->byte |= (((value >> shift)
5007 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
5008 << (BITS_PER_UNIT - this_time - next_bit));
5012 /* On little-endian machines,
5013 take first the least significant bits of the value
5014 and pack them starting at the least significant
5015 bits of the bytes. */
5016 shift = next_offset - byte_relative_ebitpos;
5018 /* Don't try to take a bunch of bits that cross
5019 the word boundary in the INTEGER_CST. We can
5020 only select bits from the LOW or HIGH part
5022 if (shift < HOST_BITS_PER_WIDE_INT
5023 && shift + this_time > HOST_BITS_PER_WIDE_INT)
5024 this_time = (HOST_BITS_PER_WIDE_INT - shift);
5026 /* Now get the bits from the appropriate constant word. */
5027 if (shift < HOST_BITS_PER_WIDE_INT)
5028 value = TREE_INT_CST_LOW (local->val);
5031 gcc_assert (shift < 2 * HOST_BITS_PER_WIDE_INT);
5032 value = TREE_INT_CST_HIGH (local->val);
5033 shift -= HOST_BITS_PER_WIDE_INT;
5036 /* Get the result. This works only when:
5037 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5038 local->byte |= (((value >> shift)
5039 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
5043 next_offset += this_time;
5044 local->byte_buffer_in_use = true;
5048 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5049 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5050 caller output state of relevance in recursive invocations. */
5052 static unsigned HOST_WIDE_INT
5053 output_constructor (tree exp, unsigned HOST_WIDE_INT size,
5054 unsigned int align, oc_outer_state * outer)
5056 unsigned HOST_WIDE_INT cnt;
5057 constructor_elt *ce;
5059 oc_local_state local;
5061 /* Setup our local state to communicate with helpers. */
5064 local.align = align;
5066 local.total_bytes = 0;
5067 local.byte_buffer_in_use = outer != NULL;
5068 local.byte = outer ? outer->byte : 0;
5070 local.type = TREE_TYPE (exp);
5072 local.last_relative_index = -1;
5074 local.min_index = NULL_TREE;
5075 if (TREE_CODE (local.type) == ARRAY_TYPE
5076 && TYPE_DOMAIN (local.type) != NULL_TREE)
5077 local.min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (local.type));
5079 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
5081 /* As CE goes through the elements of the constant, FIELD goes through the
5082 structure fields if the constant is a structure. If the constant is a
5083 union, we override this by getting the field from the TREE_LIST element.
5084 But the constant could also be an array. Then FIELD is zero.
5086 There is always a maximum of one element in the chain LINK for unions
5087 (even if the initializer in a source program incorrectly contains
5090 local.field = NULL_TREE;
5091 if (TREE_CODE (local.type) == RECORD_TYPE)
5092 local.field = TYPE_FIELDS (local.type);
5095 VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), cnt, ce);
5096 cnt++, local.field = local.field ? DECL_CHAIN (local.field) : 0)
5098 local.val = ce->value;
5099 local.index = NULL_TREE;
5101 /* The element in a union constructor specifies the proper field
5103 if ((TREE_CODE (local.type) == RECORD_TYPE
5104 || TREE_CODE (local.type) == UNION_TYPE
5105 || TREE_CODE (local.type) == QUAL_UNION_TYPE)
5106 && ce->index != NULL_TREE)
5107 local.field = ce->index;
5109 else if (TREE_CODE (local.type) == ARRAY_TYPE)
5110 local.index = ce->index;
5112 #ifdef ASM_COMMENT_START
5113 if (local.field && flag_verbose_asm)
5114 fprintf (asm_out_file, "%s %s:\n",
5116 DECL_NAME (local.field)
5117 ? IDENTIFIER_POINTER (DECL_NAME (local.field))
5121 /* Eliminate the marker that makes a cast not be an lvalue. */
5122 if (local.val != NULL_TREE)
5123 STRIP_NOPS (local.val);
5125 /* Output the current element, using the appropriate helper ... */
5127 /* For an array slice not part of an outer bitfield. */
5129 && local.index != NULL_TREE
5130 && TREE_CODE (local.index) == RANGE_EXPR)
5131 output_constructor_array_range (&local);
5133 /* For a field that is neither a true bitfield nor part of an outer one,
5134 known to be at least byte aligned and multiple-of-bytes long. */
5136 && (local.field == NULL_TREE
5137 || !CONSTRUCTOR_BITFIELD_P (local.field)))
5138 output_constructor_regular_field (&local);
5140 /* For a true bitfield or part of an outer one. */
5142 output_constructor_bitfield (&local, outer);
5145 /* If we are not at toplevel, save the pending data for our caller.
5146 Otherwise output the pending data and padding zeros as needed. */
5148 outer->byte = local.byte;
5151 if (local.byte_buffer_in_use)
5153 assemble_integer (GEN_INT (local.byte), 1, BITS_PER_UNIT, 1);
5154 local.total_bytes++;
5157 if ((unsigned HOST_WIDE_INT)local.total_bytes < local.size)
5159 assemble_zeros (local.size - local.total_bytes);
5160 local.total_bytes = local.size;
5164 return local.total_bytes;
5167 /* Mark DECL as weak. */
5170 mark_weak (tree decl)
5172 DECL_WEAK (decl) = 1;
5174 if (DECL_RTL_SET_P (decl)
5175 && MEM_P (DECL_RTL (decl))
5176 && XEXP (DECL_RTL (decl), 0)
5177 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
5178 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
5181 /* Merge weak status between NEWDECL and OLDDECL. */
5184 merge_weak (tree newdecl, tree olddecl)
5186 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
5188 if (DECL_WEAK (newdecl) && TARGET_SUPPORTS_WEAK)
5191 /* We put the NEWDECL on the weak_decls list at some point
5192 and OLDDECL as well. Keep just OLDDECL on the list. */
5193 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
5194 if (TREE_VALUE (*pwd) == newdecl)
5196 *pwd = TREE_CHAIN (*pwd);
5203 if (DECL_WEAK (newdecl))
5207 /* NEWDECL is weak, but OLDDECL is not. */
5209 /* If we already output the OLDDECL, we're in trouble; we can't
5210 go back and make it weak. This should never happen in
5211 unit-at-a-time compilation. */
5212 gcc_assert (!TREE_ASM_WRITTEN (olddecl));
5214 /* If we've already generated rtl referencing OLDDECL, we may
5215 have done so in a way that will not function properly with
5216 a weak symbol. Again in unit-at-a-time this should be
5218 gcc_assert (!TREE_USED (olddecl)
5219 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)));
5221 if (TARGET_SUPPORTS_WEAK)
5223 /* We put the NEWDECL on the weak_decls list at some point.
5224 Replace it with the OLDDECL. */
5225 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
5226 if (TREE_VALUE (wd) == newdecl)
5228 TREE_VALUE (wd) = olddecl;
5231 /* We may not find the entry on the list. If NEWDECL is a
5232 weak alias, then we will have already called
5233 globalize_decl to remove the entry; in that case, we do
5234 not need to do anything. */
5237 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5238 mark_weak (olddecl);
5241 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5242 weak. Just update NEWDECL to indicate that it's weak too. */
5243 mark_weak (newdecl);
5246 /* Declare DECL to be a weak symbol. */
5249 declare_weak (tree decl)
5251 gcc_assert (TREE_CODE (decl) != FUNCTION_DECL || !TREE_ASM_WRITTEN (decl));
5252 if (! TREE_PUBLIC (decl))
5253 error ("weak declaration of %q+D must be public", decl);
5254 else if (!TARGET_SUPPORTS_WEAK)
5255 warning (0, "weak declaration of %q+D not supported", decl);
5258 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl)))
5259 DECL_ATTRIBUTES (decl)
5260 = tree_cons (get_identifier ("weak"), NULL, DECL_ATTRIBUTES (decl));
5264 weak_finish_1 (tree decl)
5266 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5267 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5270 if (! TREE_USED (decl))
5273 #ifdef ASM_WEAKEN_DECL
5274 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
5276 #ifdef ASM_WEAKEN_LABEL
5277 ASM_WEAKEN_LABEL (asm_out_file, name);
5279 #ifdef ASM_OUTPUT_WEAK_ALIAS
5281 static bool warn_once = 0;
5284 warning (0, "only weak aliases are supported in this configuration");
5294 /* This TREE_LIST contains weakref targets. */
5296 static GTY(()) tree weakref_targets;
5298 /* Forward declaration. */
5299 static tree find_decl_and_mark_needed (tree decl, tree target);
5301 /* Emit any pending weak declarations. */
5308 for (t = weakref_targets; t; t = TREE_CHAIN (t))
5310 tree alias_decl = TREE_PURPOSE (t);
5311 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
5313 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
5314 /* Remove alias_decl from the weak list, but leave entries for
5315 the target alone. */
5317 #ifndef ASM_OUTPUT_WEAKREF
5318 else if (! TREE_SYMBOL_REFERENCED (target))
5320 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5321 defined, otherwise we and weak_finish_1 would use
5322 different macros. */
5323 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5324 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
5326 tree decl = find_decl_and_mark_needed (alias_decl, target);
5330 decl = build_decl (DECL_SOURCE_LOCATION (alias_decl),
5331 TREE_CODE (alias_decl), target,
5332 TREE_TYPE (alias_decl));
5334 DECL_EXTERNAL (decl) = 1;
5335 TREE_PUBLIC (decl) = 1;
5336 DECL_ARTIFICIAL (decl) = 1;
5337 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
5338 TREE_USED (decl) = 1;
5341 weak_finish_1 (decl);
5350 /* Remove the alias and the target from the pending weak list
5351 so that we do not emit any .weak directives for the former,
5352 nor multiple .weak directives for the latter. */
5353 for (p = &weak_decls; (t2 = *p) ; )
5355 if (TREE_VALUE (t2) == alias_decl
5356 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
5357 *p = TREE_CHAIN (t2);
5359 p = &TREE_CHAIN (t2);
5362 /* Remove other weakrefs to the same target, to speed things up. */
5363 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
5365 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
5366 *p = TREE_CHAIN (t2);
5368 p = &TREE_CHAIN (t2);
5373 for (t = weak_decls; t; t = TREE_CHAIN (t))
5375 tree decl = TREE_VALUE (t);
5377 weak_finish_1 (decl);
5381 /* Emit the assembly bits to indicate that DECL is globally visible. */
5384 globalize_decl (tree decl)
5387 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5388 if (DECL_WEAK (decl))
5390 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
5393 #ifdef ASM_WEAKEN_DECL
5394 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
5396 ASM_WEAKEN_LABEL (asm_out_file, name);
5399 /* Remove this function from the pending weak list so that
5400 we do not emit multiple .weak directives for it. */
5401 for (p = &weak_decls; (t = *p) ; )
5403 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5404 *p = TREE_CHAIN (t);
5406 p = &TREE_CHAIN (t);
5409 /* Remove weakrefs to the same target from the pending weakref
5410 list, for the same reason. */
5411 for (p = &weakref_targets; (t = *p) ; )
5413 if (DECL_ASSEMBLER_NAME (decl)
5414 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5415 *p = TREE_CHAIN (t);
5417 p = &TREE_CHAIN (t);
5424 targetm.asm_out.globalize_decl_name (asm_out_file, decl);
5427 VEC(alias_pair,gc) *alias_pairs;
5429 /* Given an assembly name, find the decl it is associated with. At the
5430 same time, mark it needed for cgraph. */
5433 find_decl_and_mark_needed (tree decl, tree target)
5435 struct cgraph_node *fnode = NULL;
5436 struct varpool_node *vnode = NULL;
5438 if (TREE_CODE (decl) == FUNCTION_DECL)
5440 fnode = cgraph_node_for_asm (target);
5442 vnode = varpool_node_for_asm (target);
5446 vnode = varpool_node_for_asm (target);
5448 fnode = cgraph_node_for_asm (target);
5453 cgraph_mark_needed_node (fnode);
5458 varpool_mark_needed_node (vnode);
5459 vnode->force_output = 1;
5466 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5467 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5468 tree node is DECL to have the value of the tree node TARGET. */
5471 do_assemble_alias (tree decl, tree target)
5473 /* Emulated TLS had better not get this var. */
5474 gcc_assert(!(!targetm.have_tls
5475 && TREE_CODE (decl) == VAR_DECL
5476 && DECL_THREAD_LOCAL_P (decl)));
5478 if (TREE_ASM_WRITTEN (decl))
5481 /* We must force creation of DECL_RTL for debug info generation, even though
5482 we don't use it here. */
5483 make_decl_rtl (decl);
5485 TREE_ASM_WRITTEN (decl) = 1;
5486 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
5488 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5490 ultimate_transparent_alias_target (&target);
5492 if (!TREE_SYMBOL_REFERENCED (target))
5493 weakref_targets = tree_cons (decl, target, weakref_targets);
5495 #ifdef ASM_OUTPUT_WEAKREF
5496 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
5497 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5498 IDENTIFIER_POINTER (target));
5500 if (!TARGET_SUPPORTS_WEAK)
5502 error_at (DECL_SOURCE_LOCATION (decl),
5503 "weakref is not supported in this configuration");
5510 #ifdef ASM_OUTPUT_DEF
5511 /* Make name accessible from other files, if appropriate. */
5513 if (TREE_PUBLIC (decl))
5515 globalize_decl (decl);
5516 maybe_assemble_visibility (decl);
5518 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl)))
5520 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE) && HAVE_GNU_INDIRECT_FUNCTION
5521 ASM_OUTPUT_TYPE_DIRECTIVE
5522 (asm_out_file, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5525 error_at (DECL_SOURCE_LOCATION (decl),
5526 "ifunc is not supported in this configuration");
5530 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5531 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
5533 ASM_OUTPUT_DEF (asm_out_file,
5534 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
5535 IDENTIFIER_POINTER (target));
5537 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5542 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5543 # ifdef ASM_WEAKEN_DECL
5544 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
5546 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
5548 /* Remove this function from the pending weak list so that
5549 we do not emit multiple .weak directives for it. */
5550 for (p = &weak_decls; (t = *p) ; )
5551 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5552 *p = TREE_CHAIN (t);
5554 p = &TREE_CHAIN (t);
5556 /* Remove weakrefs to the same target from the pending weakref
5557 list, for the same reason. */
5558 for (p = &weakref_targets; (t = *p) ; )
5560 if (DECL_ASSEMBLER_NAME (decl)
5561 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5562 *p = TREE_CHAIN (t);
5564 p = &TREE_CHAIN (t);
5571 /* Allocate and construct a symbol alias set. */
5573 static symbol_alias_set_t *
5574 symbol_alias_set_create (void)
5576 return pointer_set_create ();
5579 /* Destruct and free a symbol alias set. */
5582 symbol_alias_set_destroy (symbol_alias_set_t *aset)
5584 pointer_set_destroy (aset);
5587 /* Test if a symbol alias set contains a given name. */
5590 symbol_alias_set_contains (const symbol_alias_set_t *aset, tree t)
5592 /* We accept either a DECL or an IDENTIFIER directly. */
5593 if (TREE_CODE (t) != IDENTIFIER_NODE)
5594 t = DECL_ASSEMBLER_NAME (t);
5595 t = targetm.asm_out.mangle_assembler_name (IDENTIFIER_POINTER (t));
5596 return pointer_set_contains (aset, t);
5599 /* Enter a new name into a symbol alias set. */
5602 symbol_alias_set_insert (symbol_alias_set_t *aset, tree t)
5604 /* We accept either a DECL or an IDENTIFIER directly. */
5605 if (TREE_CODE (t) != IDENTIFIER_NODE)
5606 t = DECL_ASSEMBLER_NAME (t);
5607 t = targetm.asm_out.mangle_assembler_name (IDENTIFIER_POINTER (t));
5608 return pointer_set_insert (aset, t);
5611 /* IN_SET_P is a predicate function assuming to be taken
5612 alias_pair->decl, alias_pair->target and DATA arguments.
5614 Compute set of aliases by including everything where TRIVIALLY_VISIBLE
5615 predeicate is true and propagate across aliases such that when
5616 alias DECL is included, its TARGET is included too. */
5618 static symbol_alias_set_t *
5619 propagate_aliases_forward (bool (*in_set_p)
5620 (tree decl, tree target, void *data),
5623 symbol_alias_set_t *set;
5628 set = symbol_alias_set_create ();
5629 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); ++i)
5630 if (in_set_p (p->decl, p->target, data))
5631 symbol_alias_set_insert (set, p->decl);
5635 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); ++i)
5636 if (symbol_alias_set_contains (set, p->decl)
5637 && !symbol_alias_set_insert (set, p->target))
5645 /* Like propagate_aliases_forward but do backward propagation. */
5647 symbol_alias_set_t *
5648 propagate_aliases_backward (bool (*in_set_p)
5649 (tree decl, tree target, void *data),
5652 symbol_alias_set_t *set;
5657 /* We have to compute the set of set nodes including aliases
5659 set = symbol_alias_set_create ();
5660 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); ++i)
5661 if (in_set_p (p->decl, p->target, data))
5662 symbol_alias_set_insert (set, p->target);
5666 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); ++i)
5667 if (symbol_alias_set_contains (set, p->target)
5668 && !symbol_alias_set_insert (set, p->decl))
5675 /* See if the alias is trivially visible. This means
5676 1) alias is expoerted from the unit or
5677 2) alias is used in the code.
5678 We assume that unused cgraph/varpool nodes has been
5680 Used as callback for propagate_aliases. */
5683 trivially_visible_alias (tree decl, tree target ATTRIBUTE_UNUSED,
5684 void *data ATTRIBUTE_UNUSED)
5686 struct cgraph_node *fnode = NULL;
5687 struct varpool_node *vnode = NULL;
5689 if (!TREE_PUBLIC (decl))
5691 if (TREE_CODE (decl) == FUNCTION_DECL)
5692 fnode = cgraph_get_node (decl);
5694 vnode = varpool_get_node (decl);
5695 return vnode || fnode;
5701 /* See if the target of alias is defined in this unit.
5702 Used as callback for propagate_aliases. */
5705 trivially_defined_alias (tree decl ATTRIBUTE_UNUSED,
5707 void *data ATTRIBUTE_UNUSED)
5709 struct cgraph_node *fnode = NULL;
5710 struct varpool_node *vnode = NULL;
5712 fnode = cgraph_node_for_asm (target);
5713 vnode = (fnode == NULL) ? varpool_node_for_asm (target) : NULL;
5714 return (fnode && fnode->analyzed) || (vnode && vnode->finalized);
5717 /* Remove the alias pairing for functions that are no longer in the call
5721 remove_unreachable_alias_pairs (void)
5723 symbol_alias_set_t *visible;
5727 if (alias_pairs == NULL)
5730 /* We have to compute the set of visible nodes including aliases
5732 visible = propagate_aliases_forward (trivially_visible_alias, NULL);
5734 for (i = 0; VEC_iterate (alias_pair, alias_pairs, i, p); )
5736 if (!DECL_EXTERNAL (p->decl)
5737 && !symbol_alias_set_contains (visible, p->decl))
5739 VEC_unordered_remove (alias_pair, alias_pairs, i);
5746 symbol_alias_set_destroy (visible);
5750 /* First pass of completing pending aliases. Make sure that cgraph knows
5751 which symbols will be required. */
5754 finish_aliases_1 (void)
5756 symbol_alias_set_t *defined;
5760 if (alias_pairs == NULL)
5763 /* We have to compute the set of defined nodes including aliases
5765 defined = propagate_aliases_backward (trivially_defined_alias, NULL);
5767 FOR_EACH_VEC_ELT (alias_pair, alias_pairs, i, p)
5771 target_decl = find_decl_and_mark_needed (p->decl, p->target);
5772 if (target_decl == NULL)
5774 if (symbol_alias_set_contains (defined, p->target))
5777 if (! (p->emitted_diags & ALIAS_DIAG_TO_UNDEF)
5778 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5780 error ("%q+D aliased to undefined symbol %qE",
5781 p->decl, p->target);
5782 p->emitted_diags |= ALIAS_DIAG_TO_UNDEF;
5785 else if (! (p->emitted_diags & ALIAS_DIAG_TO_EXTERN)
5786 && DECL_EXTERNAL (target_decl)
5787 /* We use local aliases for C++ thunks to force the tailcall
5788 to bind locally. This is a hack - to keep it working do
5789 the following (which is not strictly correct). */
5790 && (! TREE_CODE (target_decl) == FUNCTION_DECL
5791 || ! DECL_VIRTUAL_P (target_decl))
5792 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
5794 error ("%q+D aliased to external symbol %qE",
5795 p->decl, p->target);
5796 p->emitted_diags |= ALIAS_DIAG_TO_EXTERN;
5800 symbol_alias_set_destroy (defined);
5803 /* Second pass of completing pending aliases. Emit the actual assembly.
5804 This happens at the end of compilation and thus it is assured that the
5805 target symbol has been emitted. */
5808 finish_aliases_2 (void)
5813 FOR_EACH_VEC_ELT (alias_pair, alias_pairs, i, p)
5814 do_assemble_alias (p->decl, p->target);
5816 VEC_truncate (alias_pair, alias_pairs, 0);
5819 /* Emit an assembler directive to make the symbol for DECL an alias to
5820 the symbol for TARGET. */
5823 assemble_alias (tree decl, tree target)
5826 bool is_weakref = false;
5828 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5830 tree alias = DECL_ASSEMBLER_NAME (decl);
5834 ultimate_transparent_alias_target (&target);
5836 if (alias == target)
5837 error ("weakref %q+D ultimately targets itself", decl);
5840 #ifndef ASM_OUTPUT_WEAKREF
5841 IDENTIFIER_TRANSPARENT_ALIAS (alias) = 1;
5842 TREE_CHAIN (alias) = target;
5845 if (TREE_PUBLIC (decl))
5846 error ("weakref %q+D must have static linkage", decl);
5850 #if !defined (ASM_OUTPUT_DEF)
5851 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5852 error_at (DECL_SOURCE_LOCATION (decl),
5853 "alias definitions not supported in this configuration");
5856 if (!DECL_WEAK (decl))
5858 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl)))
5859 error_at (DECL_SOURCE_LOCATION (decl),
5860 "ifunc is not supported in this configuration");
5862 error_at (DECL_SOURCE_LOCATION (decl),
5863 "only weak aliases are supported in this configuration");
5869 TREE_USED (decl) = 1;
5871 /* A quirk of the initial implementation of aliases required that the user
5872 add "extern" to all of them. Which is silly, but now historical. Do
5873 note that the symbol is in fact locally defined. */
5875 DECL_EXTERNAL (decl) = 0;
5877 /* Allow aliases to aliases. */
5878 if (TREE_CODE (decl) == FUNCTION_DECL)
5879 cgraph_node (decl)->alias = true;
5881 varpool_node (decl)->alias = true;
5883 /* If the target has already been emitted, we don't have to queue the
5884 alias. This saves a tad of memory. */
5885 if (cgraph_global_info_ready)
5886 target_decl = find_decl_and_mark_needed (decl, target);
5889 if (target_decl && TREE_ASM_WRITTEN (target_decl))
5890 do_assemble_alias (decl, target);
5893 alias_pair *p = VEC_safe_push (alias_pair, gc, alias_pairs, NULL);
5896 p->emitted_diags = ALIAS_DIAG_NONE;
5900 /* Emit an assembler directive to set symbol for DECL visibility to
5901 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5904 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED,
5905 int vis ATTRIBUTE_UNUSED)
5907 #ifdef HAVE_GAS_HIDDEN
5908 static const char * const visibility_types[] = {
5909 NULL, "protected", "hidden", "internal"
5912 const char *name, *type;
5914 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5915 type = visibility_types[vis];
5917 fprintf (asm_out_file, "\t.%s\t", type);
5918 assemble_name (asm_out_file, name);
5919 fprintf (asm_out_file, "\n");
5921 warning (OPT_Wattributes, "visibility attribute not supported "
5922 "in this configuration; ignored");
5926 /* A helper function to call assemble_visibility when needed for a decl. */
5929 maybe_assemble_visibility (tree decl)
5931 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5933 if (vis != VISIBILITY_DEFAULT)
5935 targetm.asm_out.assemble_visibility (decl, vis);
5942 /* Returns 1 if the target configuration supports defining public symbols
5943 so that one of them will be chosen at link time instead of generating a
5944 multiply-defined symbol error, whether through the use of weak symbols or
5945 a target-specific mechanism for having duplicates discarded. */
5948 supports_one_only (void)
5950 if (SUPPORTS_ONE_ONLY)
5952 return TARGET_SUPPORTS_WEAK;
5955 /* Set up DECL as a public symbol that can be defined in multiple
5956 translation units without generating a linker error. */
5959 make_decl_one_only (tree decl, tree comdat_group)
5961 gcc_assert (TREE_CODE (decl) == VAR_DECL
5962 || TREE_CODE (decl) == FUNCTION_DECL);
5964 TREE_PUBLIC (decl) = 1;
5966 if (SUPPORTS_ONE_ONLY)
5968 #ifdef MAKE_DECL_ONE_ONLY
5969 MAKE_DECL_ONE_ONLY (decl);
5971 DECL_COMDAT_GROUP (decl) = comdat_group;
5973 else if (TREE_CODE (decl) == VAR_DECL
5974 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
5975 DECL_COMMON (decl) = 1;
5978 gcc_assert (TARGET_SUPPORTS_WEAK);
5979 DECL_WEAK (decl) = 1;
5984 init_varasm_once (void)
5986 section_htab = htab_create_ggc (31, section_entry_hash,
5987 section_entry_eq, NULL);
5988 object_block_htab = htab_create_ggc (31, object_block_entry_hash,
5989 object_block_entry_eq, NULL);
5990 const_desc_htab = htab_create_ggc (1009, const_desc_hash,
5991 const_desc_eq, NULL);
5993 const_alias_set = new_alias_set ();
5994 shared_constant_pool = create_constant_pool ();
5996 #ifdef TEXT_SECTION_ASM_OP
5997 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
5998 TEXT_SECTION_ASM_OP);
6001 #ifdef DATA_SECTION_ASM_OP
6002 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
6003 DATA_SECTION_ASM_OP);
6006 #ifdef SDATA_SECTION_ASM_OP
6007 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
6008 SDATA_SECTION_ASM_OP);
6011 #ifdef READONLY_DATA_SECTION_ASM_OP
6012 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
6013 READONLY_DATA_SECTION_ASM_OP);
6016 #ifdef CTORS_SECTION_ASM_OP
6017 ctors_section = get_unnamed_section (0, output_section_asm_op,
6018 CTORS_SECTION_ASM_OP);
6021 #ifdef DTORS_SECTION_ASM_OP
6022 dtors_section = get_unnamed_section (0, output_section_asm_op,
6023 DTORS_SECTION_ASM_OP);
6026 #ifdef BSS_SECTION_ASM_OP
6027 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
6028 output_section_asm_op,
6029 BSS_SECTION_ASM_OP);
6032 #ifdef SBSS_SECTION_ASM_OP
6033 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
6034 output_section_asm_op,
6035 SBSS_SECTION_ASM_OP);
6038 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
6039 | SECTION_COMMON, emit_tls_common);
6040 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
6041 | SECTION_COMMON, emit_local);
6042 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
6043 | SECTION_COMMON, emit_common);
6045 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
6046 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
6050 targetm.asm_out.init_sections ();
6052 if (readonly_data_section == NULL)
6053 readonly_data_section = text_section;
6055 #ifdef ASM_OUTPUT_EXTERNAL
6056 pending_assemble_externals_set = pointer_set_create ();
6061 decl_default_tls_model (const_tree decl)
6063 enum tls_model kind;
6066 is_local = targetm.binds_local_p (decl);
6070 kind = TLS_MODEL_LOCAL_EXEC;
6072 kind = TLS_MODEL_INITIAL_EXEC;
6075 /* Local dynamic is inefficient when we're not combining the
6076 parts of the address. */
6077 else if (optimize && is_local)
6078 kind = TLS_MODEL_LOCAL_DYNAMIC;
6080 kind = TLS_MODEL_GLOBAL_DYNAMIC;
6081 if (kind < flag_tls_default)
6082 kind = flag_tls_default;
6087 /* Select a set of attributes for section NAME based on the properties
6088 of DECL and whether or not RELOC indicates that DECL's initializer
6089 might contain runtime relocations.
6091 We make the section read-only and executable for a function decl,
6092 read-only for a const data decl, and writable for a non-const data decl. */
6095 default_section_type_flags (tree decl, const char *name, int reloc)
6099 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
6100 flags = SECTION_CODE;
6103 enum section_category category
6104 = categorize_decl_for_section (decl, reloc);
6105 if (decl_readonly_section_1 (category))
6107 else if (category == SECCAT_DATA_REL_RO
6108 || category == SECCAT_DATA_REL_RO_LOCAL)
6109 flags = SECTION_WRITE | SECTION_RELRO;
6111 flags = SECTION_WRITE;
6115 flags = SECTION_WRITE;
6116 if (strcmp (name, ".data.rel.ro") == 0
6117 || strcmp (name, ".data.rel.ro.local") == 0)
6118 flags |= SECTION_RELRO;
6121 if (decl && DECL_ONE_ONLY (decl))
6122 flags |= SECTION_LINKONCE;
6124 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
6125 flags |= SECTION_TLS | SECTION_WRITE;
6127 if (strcmp (name, ".bss") == 0
6128 || strncmp (name, ".bss.", 5) == 0
6129 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
6130 || strcmp (name, ".sbss") == 0
6131 || strncmp (name, ".sbss.", 6) == 0
6132 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
6133 flags |= SECTION_BSS;
6135 if (strcmp (name, ".tdata") == 0
6136 || strncmp (name, ".tdata.", 7) == 0
6137 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
6138 flags |= SECTION_TLS;
6140 if (strcmp (name, ".tbss") == 0
6141 || strncmp (name, ".tbss.", 6) == 0
6142 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
6143 flags |= SECTION_TLS | SECTION_BSS;
6145 /* These three sections have special ELF types. They are neither
6146 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6147 want to print a section type (@progbits or @nobits). If someone
6148 is silly enough to emit code or TLS variables to one of these
6149 sections, then don't handle them specially. */
6150 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
6151 && (strcmp (name, ".init_array") == 0
6152 || strcmp (name, ".fini_array") == 0
6153 || strcmp (name, ".preinit_array") == 0))
6154 flags |= SECTION_NOTYPE;
6159 /* Return true if the target supports some form of global BSS,
6160 either through bss_noswitch_section, or by selecting a BSS
6161 section in TARGET_ASM_SELECT_SECTION. */
6164 have_global_bss_p (void)
6166 return bss_noswitch_section || targetm.have_switchable_bss_sections;
6169 /* Output assembly to switch to section NAME with attribute FLAGS.
6170 Four variants for common object file formats. */
6173 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
6174 unsigned int flags ATTRIBUTE_UNUSED,
6175 tree decl ATTRIBUTE_UNUSED)
6177 /* Some object formats don't support named sections at all. The
6178 front-end should already have flagged this as an error. */
6182 #ifndef TLS_SECTION_ASM_FLAG
6183 #define TLS_SECTION_ASM_FLAG 'T'
6187 default_elf_asm_named_section (const char *name, unsigned int flags,
6188 tree decl ATTRIBUTE_UNUSED)
6190 char flagchars[10], *f = flagchars;
6192 /* If we have already declared this section, we can use an
6193 abbreviated form to switch back to it -- unless this section is
6194 part of a COMDAT groups, in which case GAS requires the full
6195 declaration every time. */
6196 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6197 && (flags & SECTION_DECLARED))
6199 fprintf (asm_out_file, "\t.section\t%s\n", name);
6203 if (!(flags & SECTION_DEBUG))
6205 if (flags & SECTION_WRITE)
6207 if (flags & SECTION_CODE)
6209 if (flags & SECTION_SMALL)
6211 if (flags & SECTION_MERGE)
6213 if (flags & SECTION_STRINGS)
6215 if (flags & SECTION_TLS)
6216 *f++ = TLS_SECTION_ASM_FLAG;
6217 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6221 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
6223 if (!(flags & SECTION_NOTYPE))
6228 if (flags & SECTION_BSS)
6234 #ifdef ASM_COMMENT_START
6235 /* On platforms that use "@" as the assembly comment character,
6237 if (strcmp (ASM_COMMENT_START, "@") == 0)
6240 fprintf (asm_out_file, format, type);
6242 if (flags & SECTION_ENTSIZE)
6243 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
6244 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6246 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6247 fprintf (asm_out_file, ",%s,comdat", IDENTIFIER_POINTER (decl));
6249 fprintf (asm_out_file, ",%s,comdat",
6250 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl)));
6254 putc ('\n', asm_out_file);
6258 default_coff_asm_named_section (const char *name, unsigned int flags,
6259 tree decl ATTRIBUTE_UNUSED)
6261 char flagchars[8], *f = flagchars;
6263 if (flags & SECTION_WRITE)
6265 if (flags & SECTION_CODE)
6269 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
6273 default_pe_asm_named_section (const char *name, unsigned int flags,
6276 default_coff_asm_named_section (name, flags, decl);
6278 if (flags & SECTION_LINKONCE)
6280 /* Functions may have been compiled at various levels of
6281 optimization so we can't use `same_size' here.
6282 Instead, have the linker pick one. */
6283 fprintf (asm_out_file, "\t.linkonce %s\n",
6284 (flags & SECTION_CODE ? "discard" : "same_size"));
6288 /* The lame default section selector. */
6291 default_select_section (tree decl, int reloc,
6292 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6296 if (decl_readonly_section (decl, reloc))
6297 return readonly_data_section;
6299 else if (TREE_CODE (decl) == CONSTRUCTOR)
6301 if (! ((flag_pic && reloc)
6302 || !TREE_READONLY (decl)
6303 || TREE_SIDE_EFFECTS (decl)
6304 || !TREE_CONSTANT (decl)))
6305 return readonly_data_section;
6307 else if (TREE_CODE (decl) == STRING_CST)
6308 return readonly_data_section;
6309 else if (! (flag_pic && reloc))
6310 return readonly_data_section;
6312 return data_section;
6315 enum section_category
6316 categorize_decl_for_section (const_tree decl, int reloc)
6318 enum section_category ret;
6320 if (TREE_CODE (decl) == FUNCTION_DECL)
6322 else if (TREE_CODE (decl) == STRING_CST)
6324 if (flag_mudflap) /* or !flag_merge_constants */
6325 return SECCAT_RODATA;
6327 return SECCAT_RODATA_MERGE_STR;
6329 else if (TREE_CODE (decl) == VAR_DECL)
6331 if (bss_initializer_p (decl))
6333 else if (! TREE_READONLY (decl)
6334 || TREE_SIDE_EFFECTS (decl)
6335 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
6337 /* Here the reloc_rw_mask is not testing whether the section should
6338 be read-only or not, but whether the dynamic link will have to
6339 do something. If so, we wish to segregate the data in order to
6340 minimize cache misses inside the dynamic linker. */
6341 if (reloc & targetm.asm_out.reloc_rw_mask ())
6342 ret = reloc == 1 ? SECCAT_DATA_REL_LOCAL : SECCAT_DATA_REL;
6346 else if (reloc & targetm.asm_out.reloc_rw_mask ())
6347 ret = reloc == 1 ? SECCAT_DATA_REL_RO_LOCAL : SECCAT_DATA_REL_RO;
6348 else if (reloc || flag_merge_constants < 2)
6349 /* C and C++ don't allow different variables to share the same
6350 location. -fmerge-all-constants allows even that (at the
6351 expense of not conforming). */
6352 ret = SECCAT_RODATA;
6353 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
6354 ret = SECCAT_RODATA_MERGE_STR_INIT;
6356 ret = SECCAT_RODATA_MERGE_CONST;
6358 else if (TREE_CODE (decl) == CONSTRUCTOR)
6360 if ((reloc & targetm.asm_out.reloc_rw_mask ())
6361 || TREE_SIDE_EFFECTS (decl)
6362 || ! TREE_CONSTANT (decl))
6365 ret = SECCAT_RODATA;
6368 ret = SECCAT_RODATA;
6370 /* There are no read-only thread-local sections. */
6371 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
6373 /* Note that this would be *just* SECCAT_BSS, except that there's
6374 no concept of a read-only thread-local-data section. */
6375 if (ret == SECCAT_BSS
6376 || (flag_zero_initialized_in_bss
6377 && initializer_zerop (DECL_INITIAL (decl))))
6383 /* If the target uses small data sections, select it. */
6384 else if (targetm.in_small_data_p (decl))
6386 if (ret == SECCAT_BSS)
6388 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
6389 ret = SECCAT_SRODATA;
6398 decl_readonly_section_1 (enum section_category category)
6403 case SECCAT_RODATA_MERGE_STR:
6404 case SECCAT_RODATA_MERGE_STR_INIT:
6405 case SECCAT_RODATA_MERGE_CONST:
6406 case SECCAT_SRODATA:
6414 decl_readonly_section (const_tree decl, int reloc)
6416 return decl_readonly_section_1 (categorize_decl_for_section (decl, reloc));
6419 /* Select a section based on the above categorization. */
6422 default_elf_select_section (tree decl, int reloc,
6423 unsigned HOST_WIDE_INT align)
6426 switch (categorize_decl_for_section (decl, reloc))
6429 /* We're not supposed to be called on FUNCTION_DECLs. */
6432 return readonly_data_section;
6433 case SECCAT_RODATA_MERGE_STR:
6434 return mergeable_string_section (decl, align, 0);
6435 case SECCAT_RODATA_MERGE_STR_INIT:
6436 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
6437 case SECCAT_RODATA_MERGE_CONST:
6438 return mergeable_constant_section (DECL_MODE (decl), align, 0);
6439 case SECCAT_SRODATA:
6443 return data_section;
6444 case SECCAT_DATA_REL:
6445 sname = ".data.rel";
6447 case SECCAT_DATA_REL_LOCAL:
6448 sname = ".data.rel.local";
6450 case SECCAT_DATA_REL_RO:
6451 sname = ".data.rel.ro";
6453 case SECCAT_DATA_REL_RO_LOCAL:
6454 sname = ".data.rel.ro.local";
6479 return get_named_section (decl, sname, reloc);
6482 /* Construct a unique section name based on the decl name and the
6483 categorization performed above. */
6486 default_unique_section (tree decl, int reloc)
6488 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6489 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
6490 const char *prefix, *name, *linkonce;
6493 switch (categorize_decl_for_section (decl, reloc))
6496 prefix = one_only ? ".t" : ".text";
6499 case SECCAT_RODATA_MERGE_STR:
6500 case SECCAT_RODATA_MERGE_STR_INIT:
6501 case SECCAT_RODATA_MERGE_CONST:
6502 prefix = one_only ? ".r" : ".rodata";
6504 case SECCAT_SRODATA:
6505 prefix = one_only ? ".s2" : ".sdata2";
6508 prefix = one_only ? ".d" : ".data";
6510 case SECCAT_DATA_REL:
6511 prefix = one_only ? ".d.rel" : ".data.rel";
6513 case SECCAT_DATA_REL_LOCAL:
6514 prefix = one_only ? ".d.rel.local" : ".data.rel.local";
6516 case SECCAT_DATA_REL_RO:
6517 prefix = one_only ? ".d.rel.ro" : ".data.rel.ro";
6519 case SECCAT_DATA_REL_RO_LOCAL:
6520 prefix = one_only ? ".d.rel.ro.local" : ".data.rel.ro.local";
6523 prefix = one_only ? ".s" : ".sdata";
6526 prefix = one_only ? ".b" : ".bss";
6529 prefix = one_only ? ".sb" : ".sbss";
6532 prefix = one_only ? ".td" : ".tdata";
6535 prefix = one_only ? ".tb" : ".tbss";
6541 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
6542 name = targetm.strip_name_encoding (name);
6544 /* If we're using one_only, then there needs to be a .gnu.linkonce
6545 prefix to the section name. */
6546 linkonce = one_only ? ".gnu.linkonce" : "";
6548 string = ACONCAT ((linkonce, prefix, ".", name, NULL));
6550 DECL_SECTION_NAME (decl) = build_string (strlen (string), string);
6553 /* Like compute_reloc_for_constant, except for an RTX. The return value
6554 is a mask for which bit 1 indicates a global relocation, and bit 0
6555 indicates a local relocation. */
6558 compute_reloc_for_rtx_1 (rtx *xp, void *data)
6560 int *preloc = (int *) data;
6563 switch (GET_CODE (x))
6566 *preloc |= SYMBOL_REF_LOCAL_P (x) ? 1 : 2;
6579 compute_reloc_for_rtx (rtx x)
6583 switch (GET_CODE (x))
6589 for_each_rtx (&x, compute_reloc_for_rtx_1, &reloc);
6598 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED,
6600 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6602 if (compute_reloc_for_rtx (x) & targetm.asm_out.reloc_rw_mask ())
6603 return data_section;
6605 return readonly_data_section;
6609 default_elf_select_rtx_section (enum machine_mode mode, rtx x,
6610 unsigned HOST_WIDE_INT align)
6612 int reloc = compute_reloc_for_rtx (x);
6614 /* ??? Handle small data here somehow. */
6616 if (reloc & targetm.asm_out.reloc_rw_mask ())
6619 return get_named_section (NULL, ".data.rel.ro.local", 1);
6621 return get_named_section (NULL, ".data.rel.ro", 3);
6624 return mergeable_constant_section (mode, align, 0);
6627 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6630 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
6635 /* Careful not to prod global register variables. */
6638 symbol = XEXP (rtl, 0);
6639 if (GET_CODE (symbol) != SYMBOL_REF)
6642 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
6643 if (TREE_CODE (decl) == FUNCTION_DECL)
6644 flags |= SYMBOL_FLAG_FUNCTION;
6645 if (targetm.binds_local_p (decl))
6646 flags |= SYMBOL_FLAG_LOCAL;
6647 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
6648 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
6649 else if (targetm.in_small_data_p (decl))
6650 flags |= SYMBOL_FLAG_SMALL;
6651 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6652 being PUBLIC, the thing *must* be defined in this translation unit.
6653 Prevent this buglet from being propagated into rtl code as well. */
6654 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
6655 flags |= SYMBOL_FLAG_EXTERNAL;
6657 SYMBOL_REF_FLAGS (symbol) = flags;
6660 /* By default, we do nothing for encode_section_info, so we need not
6661 do anything but discard the '*' marker. */
6664 default_strip_name_encoding (const char *str)
6666 return str + (*str == '*');
6669 #ifdef ASM_OUTPUT_DEF
6670 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6671 anchor relative to ".", the current section position. */
6674 default_asm_output_anchor (rtx symbol)
6678 sprintf (buffer, "*. + " HOST_WIDE_INT_PRINT_DEC,
6679 SYMBOL_REF_BLOCK_OFFSET (symbol));
6680 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
6684 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6687 default_use_anchors_for_symbol_p (const_rtx symbol)
6692 /* Don't use anchors for mergeable sections. The linker might move
6693 the objects around. */
6694 sect = SYMBOL_REF_BLOCK (symbol)->sect;
6695 if (sect->common.flags & SECTION_MERGE)
6698 /* Don't use anchors for small data sections. The small data register
6699 acts as an anchor for such sections. */
6700 if (sect->common.flags & SECTION_SMALL)
6703 decl = SYMBOL_REF_DECL (symbol);
6704 if (decl && DECL_P (decl))
6706 /* Don't use section anchors for decls that might be defined by
6708 if (!targetm.binds_local_p (decl))
6711 /* Don't use section anchors for decls that will be placed in a
6712 small data section. */
6713 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6714 one above. The problem is that we only use SECTION_SMALL for
6715 sections that should be marked as small in the section directive. */
6716 if (targetm.in_small_data_p (decl))
6722 /* Return true when RESOLUTION indicate that symbol will be bound to the
6723 definition provided by current .o file. */
6726 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution)
6728 return (resolution == LDPR_PREVAILING_DEF
6729 || resolution == LDPR_PREVAILING_DEF_IRONLY);
6732 /* Return true when RESOLUTION indicate that symbol will be bound locally
6733 within current executable or DSO. */
6736 resolution_local_p (enum ld_plugin_symbol_resolution resolution)
6738 return (resolution == LDPR_PREVAILING_DEF
6739 || resolution == LDPR_PREVAILING_DEF_IRONLY
6740 || resolution == LDPR_PREEMPTED_REG
6741 || resolution == LDPR_PREEMPTED_IR
6742 || resolution == LDPR_RESOLVED_IR
6743 || resolution == LDPR_RESOLVED_EXEC);
6746 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6747 wrt cross-module name binding. */
6750 default_binds_local_p (const_tree exp)
6752 return default_binds_local_p_1 (exp, flag_shlib);
6756 default_binds_local_p_1 (const_tree exp, int shlib)
6759 bool resolved_locally = false;
6760 bool resolved_to_local_def = false;
6762 /* With resolution file in hands, take look into resolutions.
6763 We can't just return true for resolved_localy symbols,
6764 because dynamic linking might overwrite symbols
6765 in shared libraries. */
6766 if (TREE_CODE (exp) == VAR_DECL && TREE_PUBLIC (exp)
6767 && (TREE_STATIC (exp) || DECL_EXTERNAL (exp)))
6769 struct varpool_node *vnode = varpool_get_node (exp);
6770 if (vnode && resolution_local_p (vnode->resolution))
6771 resolved_locally = true;
6773 && resolution_to_local_definition_p (vnode->resolution))
6774 resolved_to_local_def = true;
6776 else if (TREE_CODE (exp) == FUNCTION_DECL && TREE_PUBLIC (exp))
6778 struct cgraph_node *node = cgraph_get_node_or_alias (exp);
6780 && resolution_local_p (node->resolution))
6781 resolved_locally = true;
6783 && resolution_to_local_definition_p (node->resolution))
6784 resolved_to_local_def = true;
6787 /* A non-decl is an entry in the constant pool. */
6790 /* Weakrefs may not bind locally, even though the weakref itself is always
6791 static and therefore local. Similarly, the resolver for ifunc functions
6792 might resolve to a non-local function.
6793 FIXME: We can resolve the weakref case more curefuly by looking at the
6795 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp))
6796 || (TREE_CODE (exp) == FUNCTION_DECL
6797 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp))))
6799 /* Static variables are always local. */
6800 else if (! TREE_PUBLIC (exp))
6802 /* A variable is local if the user has said explicitly that it will
6804 else if ((DECL_VISIBILITY_SPECIFIED (exp)
6805 || resolved_to_local_def)
6806 && DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6808 /* Variables defined outside this object might not be local. */
6809 else if (DECL_EXTERNAL (exp) && !resolved_locally)
6811 /* If defined in this object and visibility is not default, must be
6813 else if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT)
6815 /* Default visibility weak data can be overridden by a strong symbol
6816 in another module and so are not local. */
6817 else if (DECL_WEAK (exp)
6818 && !resolved_locally)
6820 /* If PIC, then assume that any global name can be overridden by
6821 symbols resolved from other modules. */
6824 /* Uninitialized COMMON variable may be unified with symbols
6825 resolved from other modules. */
6826 else if (DECL_COMMON (exp)
6827 && !resolved_locally
6828 && (DECL_INITIAL (exp) == NULL
6829 || DECL_INITIAL (exp) == error_mark_node))
6831 /* Otherwise we're left with initialized (or non-common) global data
6832 which is of necessity defined locally. */
6839 /* Return true when references to DECL must bind to current definition in
6842 The condition is usually equivalent to whether the function binds to the
6843 current module (shared library or executable), that is to binds_local_p.
6844 We use this fact to avoid need for another target hook and implement
6845 the logic using binds_local_p and just special cases where
6846 decl_binds_to_current_def_p is stronger than binds local_p. In particular
6847 the weak definitions (that can be overwritten at linktime by other
6848 definition from different object file) and when resolution info is available
6849 we simply use the knowledge passed to us by linker plugin. */
6851 decl_binds_to_current_def_p (tree decl)
6853 gcc_assert (DECL_P (decl));
6854 if (!TREE_PUBLIC (decl))
6856 if (!targetm.binds_local_p (decl))
6858 /* When resolution is available, just use it. */
6859 if (TREE_CODE (decl) == VAR_DECL && TREE_PUBLIC (decl)
6860 && (TREE_STATIC (decl) || DECL_EXTERNAL (decl)))
6862 struct varpool_node *vnode = varpool_get_node (decl);
6864 && vnode->resolution != LDPR_UNKNOWN)
6865 return resolution_to_local_definition_p (vnode->resolution);
6867 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_PUBLIC (decl))
6869 struct cgraph_node *node = cgraph_get_node_or_alias (decl);
6871 && node->resolution != LDPR_UNKNOWN)
6872 return resolution_to_local_definition_p (node->resolution);
6874 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6875 binds localy but still can be overwritten).
6876 This rely on fact that binds_local_p behave as decl_replaceable_p
6877 for all other declaration types. */
6878 return !DECL_WEAK (decl);
6881 /* A replaceable function or variable is one which may be replaced
6882 at link-time with an entirely different definition, provided that the
6883 replacement has the same type. For example, functions declared
6884 with __attribute__((weak)) on most systems are replaceable.
6886 COMDAT functions are not replaceable, since all definitions of the
6887 function must be equivalent. It is important that COMDAT functions
6888 not be treated as replaceable so that use of C++ template
6889 instantiations is not penalized. */
6892 decl_replaceable_p (tree decl)
6894 gcc_assert (DECL_P (decl));
6895 if (!TREE_PUBLIC (decl) || DECL_COMDAT (decl))
6897 return !decl_binds_to_current_def_p (decl);
6900 /* Default function to output code that will globalize a label. A
6901 target must define GLOBAL_ASM_OP or provide its own function to
6902 globalize a label. */
6903 #ifdef GLOBAL_ASM_OP
6905 default_globalize_label (FILE * stream, const char *name)
6907 fputs (GLOBAL_ASM_OP, stream);
6908 assemble_name (stream, name);
6909 putc ('\n', stream);
6911 #endif /* GLOBAL_ASM_OP */
6913 /* Default function to output code that will globalize a declaration. */
6915 default_globalize_decl_name (FILE * stream, tree decl)
6917 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
6918 targetm.asm_out.globalize_label (stream, name);
6921 /* Default function to output a label for unwind information. The
6922 default is to do nothing. A target that needs nonlocal labels for
6923 unwind information must provide its own function to do this. */
6925 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
6926 tree decl ATTRIBUTE_UNUSED,
6927 int for_eh ATTRIBUTE_UNUSED,
6928 int empty ATTRIBUTE_UNUSED)
6932 /* Default function to output a label to divide up the exception table.
6933 The default is to do nothing. A target that needs/wants to divide
6934 up the table must provide it's own function to do this. */
6936 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
6940 /* This is how to output an internal numbered label where PREFIX is
6941 the class of label and LABELNO is the number within the class. */
6944 default_generate_internal_label (char *buf, const char *prefix,
6945 unsigned long labelno)
6947 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
6950 /* This is how to output an internal numbered label where PREFIX is
6951 the class of label and LABELNO is the number within the class. */
6954 default_internal_label (FILE *stream, const char *prefix,
6955 unsigned long labelno)
6957 char *const buf = (char *) alloca (40 + strlen (prefix));
6958 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
6959 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
6963 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6966 default_asm_declare_constant_name (FILE *file, const char *name,
6967 const_tree exp ATTRIBUTE_UNUSED,
6968 HOST_WIDE_INT size ATTRIBUTE_UNUSED)
6970 assemble_label (file, name);
6973 /* This is the default behavior at the beginning of a file. It's
6974 controlled by two other target-hook toggles. */
6976 default_file_start (void)
6978 if (targetm.asm_file_start_app_off
6979 && !(flag_verbose_asm || flag_debug_asm || flag_dump_rtl_in_asm))
6980 fputs (ASM_APP_OFF, asm_out_file);
6982 if (targetm.asm_file_start_file_directive)
6983 output_file_directive (asm_out_file, main_input_filename);
6986 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6987 which emits a special section directive used to indicate whether or
6988 not this object file needs an executable stack. This is primarily
6989 a GNU extension to ELF but could be used on other targets. */
6991 int trampolines_created;
6994 file_end_indicate_exec_stack (void)
6996 unsigned int flags = SECTION_DEBUG;
6997 if (trampolines_created)
6998 flags |= SECTION_CODE;
7000 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
7003 /* Emit a special section directive to indicate that this object file
7004 was compiled with -fsplit-stack. This is used to let the linker
7005 detect calls between split-stack code and non-split-stack code, so
7006 that it can modify the split-stack code to allocate a sufficiently
7007 large stack. We emit another special section if there are any
7008 functions in this file which have the no_split_stack attribute, to
7009 prevent the linker from warning about being unable to convert the
7010 functions if they call non-split-stack code. */
7013 file_end_indicate_split_stack (void)
7015 if (flag_split_stack)
7017 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG,
7019 if (saw_no_split_stack)
7020 switch_to_section (get_section (".note.GNU-no-split-stack",
7021 SECTION_DEBUG, NULL));
7025 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7026 a get_unnamed_section callback. */
7029 output_section_asm_op (const void *directive)
7031 fprintf (asm_out_file, "%s\n", (const char *) directive);
7034 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7035 the current section is NEW_SECTION. */
7038 switch_to_section (section *new_section)
7040 if (in_section == new_section)
7043 if (new_section->common.flags & SECTION_FORGET)
7046 in_section = new_section;
7048 switch (SECTION_STYLE (new_section))
7051 targetm.asm_out.named_section (new_section->named.name,
7052 new_section->named.common.flags,
7053 new_section->named.decl);
7056 case SECTION_UNNAMED:
7057 new_section->unnamed.callback (new_section->unnamed.data);
7060 case SECTION_NOSWITCH:
7065 new_section->common.flags |= SECTION_DECLARED;
7068 /* If block symbol SYMBOL has not yet been assigned an offset, place
7069 it at the end of its block. */
7072 place_block_symbol (rtx symbol)
7074 unsigned HOST_WIDE_INT size, mask, offset;
7075 struct constant_descriptor_rtx *desc;
7076 unsigned int alignment;
7077 struct object_block *block;
7080 gcc_assert (SYMBOL_REF_BLOCK (symbol));
7081 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
7084 /* Work out the symbol's size and alignment. */
7085 if (CONSTANT_POOL_ADDRESS_P (symbol))
7087 desc = SYMBOL_REF_CONSTANT (symbol);
7088 alignment = desc->align;
7089 size = GET_MODE_SIZE (desc->mode);
7091 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
7093 decl = SYMBOL_REF_DECL (symbol);
7094 alignment = DECL_ALIGN (decl);
7095 size = get_constant_size (DECL_INITIAL (decl));
7099 decl = SYMBOL_REF_DECL (symbol);
7100 alignment = DECL_ALIGN (decl);
7101 size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
7104 /* Calculate the object's offset from the start of the block. */
7105 block = SYMBOL_REF_BLOCK (symbol);
7106 mask = alignment / BITS_PER_UNIT - 1;
7107 offset = (block->size + mask) & ~mask;
7108 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
7110 /* Record the block's new alignment and size. */
7111 block->alignment = MAX (block->alignment, alignment);
7112 block->size = offset + size;
7114 VEC_safe_push (rtx, gc, block->objects, symbol);
7117 /* Return the anchor that should be used to address byte offset OFFSET
7118 from the first object in BLOCK. MODEL is the TLS model used
7122 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
7123 enum tls_model model)
7126 unsigned int begin, middle, end;
7127 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
7130 /* Work out the anchor's offset. Use an offset of 0 for the first
7131 anchor so that we don't pessimize the case where we take the address
7132 of a variable at the beginning of the block. This is particularly
7133 useful when a block has only one variable assigned to it.
7135 We try to place anchors RANGE bytes apart, so there can then be
7136 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7137 a ptr_mode offset. With some target settings, the lowest such
7138 anchor might be out of range for the lowest ptr_mode offset;
7139 likewise the highest anchor for the highest offset. Use anchors
7140 at the extreme ends of the ptr_mode range in such cases.
7142 All arithmetic uses unsigned integers in order to avoid
7144 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
7145 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
7146 range = max_offset - min_offset + 1;
7151 bias = 1 << (GET_MODE_BITSIZE (ptr_mode) - 1);
7154 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
7155 delta -= delta % range;
7158 offset = (HOST_WIDE_INT) (-delta);
7162 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
7163 delta -= delta % range;
7164 if (delta > bias - 1)
7166 offset = (HOST_WIDE_INT) delta;
7170 /* Do a binary search to see if there's already an anchor we can use.
7171 Set BEGIN to the new anchor's index if not. */
7173 end = VEC_length (rtx, block->anchors);
7174 while (begin != end)
7176 middle = (end + begin) / 2;
7177 anchor = VEC_index (rtx, block->anchors, middle);
7178 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
7180 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
7182 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
7184 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
7190 /* Create a new anchor with a unique label. */
7191 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
7192 anchor = create_block_symbol (ggc_strdup (label), block, offset);
7193 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
7194 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
7196 /* Insert it at index BEGIN. */
7197 VEC_safe_insert (rtx, gc, block->anchors, begin, anchor);
7201 /* Output the objects in BLOCK. */
7204 output_object_block (struct object_block *block)
7206 struct constant_descriptor_rtx *desc;
7208 HOST_WIDE_INT offset;
7212 if (block->objects == NULL)
7215 /* Switch to the section and make sure that the first byte is
7216 suitably aligned. */
7217 switch_to_section (block->sect);
7218 assemble_align (block->alignment);
7220 /* Define the values of all anchors relative to the current section
7222 FOR_EACH_VEC_ELT (rtx, block->anchors, i, symbol)
7223 targetm.asm_out.output_anchor (symbol);
7225 /* Output the objects themselves. */
7227 FOR_EACH_VEC_ELT (rtx, block->objects, i, symbol)
7229 /* Move to the object's offset, padding with zeros if necessary. */
7230 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
7231 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
7232 if (CONSTANT_POOL_ADDRESS_P (symbol))
7234 desc = SYMBOL_REF_CONSTANT (symbol);
7235 output_constant_pool_1 (desc, 1);
7236 offset += GET_MODE_SIZE (desc->mode);
7238 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
7240 decl = SYMBOL_REF_DECL (symbol);
7241 assemble_constant_contents (DECL_INITIAL (decl), XSTR (symbol, 0),
7243 offset += get_constant_size (DECL_INITIAL (decl));
7247 decl = SYMBOL_REF_DECL (symbol);
7248 assemble_variable_contents (decl, XSTR (symbol, 0), false);
7249 offset += tree_low_cst (DECL_SIZE_UNIT (decl), 1);
7254 /* A htab_traverse callback used to call output_object_block for
7255 each member of object_block_htab. */
7258 output_object_block_htab (void **slot, void *data ATTRIBUTE_UNUSED)
7260 output_object_block ((struct object_block *) (*slot));
7264 /* Output the definitions of all object_blocks. */
7267 output_object_blocks (void)
7269 htab_traverse (object_block_htab, output_object_block_htab, NULL);
7272 /* This function provides a possible implementation of the
7273 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7274 by -frecord-gcc-switches it creates a new mergeable, string section in the
7275 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7276 contains the switches in ASCII format.
7278 FIXME: This code does not correctly handle double quote characters
7279 that appear inside strings, (it strips them rather than preserving them).
7280 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7281 characters - instead it treats them as sub-string separators. Since
7282 we want to emit NUL strings terminators into the object file we have to use
7286 elf_record_gcc_switches (print_switch_type type, const char * name)
7290 case SWITCH_TYPE_PASSED:
7291 ASM_OUTPUT_ASCII (asm_out_file, name, strlen (name));
7292 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
7295 case SWITCH_TYPE_DESCRIPTIVE:
7298 /* Distinguish between invocations where name is NULL. */
7299 static bool started = false;
7305 sec = get_section (targetm.asm_out.record_gcc_switches_section,
7309 | (SECTION_ENTSIZE & 1),
7311 switch_to_section (sec);
7320 /* The return value is currently ignored by the caller, but must be 0.
7321 For -fverbose-asm the return value would be the number of characters
7322 emitted into the assembler file. */
7326 /* Emit text to declare externally defined symbols. It is needed to
7327 properly support non-default visibility. */
7329 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED,
7331 const char *name ATTRIBUTE_UNUSED)
7333 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7334 set in order to avoid putting out names that are never really
7336 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
7337 && targetm.binds_local_p (decl))
7338 maybe_assemble_visibility (decl);
7341 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7344 default_asm_output_source_filename (FILE *file, const char *name)
7346 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7347 ASM_OUTPUT_SOURCE_FILENAME (file, name);
7349 fprintf (file, "\t.file\t");
7350 output_quoted_string (file, name);
7355 /* Output a file name in the form wanted by System V. */
7358 output_file_directive (FILE *asm_file, const char *input_name)
7363 if (input_name == NULL)
7364 input_name = "<stdin>";
7366 input_name = remap_debug_filename (input_name);
7368 len = strlen (input_name);
7369 na = input_name + len;
7371 /* NA gets INPUT_NAME sans directory names. */
7372 while (na > input_name)
7374 if (IS_DIR_SEPARATOR (na[-1]))
7379 targetm.asm_out.output_source_filename (asm_file, na);
7382 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7385 make_debug_expr_from_rtl (const_rtx exp)
7387 tree ddecl = make_node (DEBUG_EXPR_DECL), type;
7388 enum machine_mode mode = GET_MODE (exp);
7391 DECL_ARTIFICIAL (ddecl) = 1;
7392 if (REG_P (exp) && REG_EXPR (exp))
7393 type = TREE_TYPE (REG_EXPR (exp));
7394 else if (MEM_P (exp) && MEM_EXPR (exp))
7395 type = TREE_TYPE (MEM_EXPR (exp));
7398 if (type && TYPE_MODE (type) == mode)
7399 TREE_TYPE (ddecl) = type;
7401 TREE_TYPE (ddecl) = lang_hooks.types.type_for_mode (mode, 1);
7402 DECL_MODE (ddecl) = mode;
7403 dval = gen_rtx_DEBUG_EXPR (mode);
7404 DEBUG_EXPR_TREE_DECL (dval) = ddecl;
7405 SET_DECL_RTL (ddecl, dval);
7409 #include "gt-varasm.h"