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 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 /* This file handles generation of all the assembler code
24 *except* the instructions of a function.
25 This includes declarations of variables and their initial values.
27 We also output the assembler code for constants stored in memory
28 and are responsible for combining constants with the same value. */
32 #include "coretypes.h"
39 #include "hard-reg-set.h"
48 #include "langhooks.h"
53 #ifdef XCOFF_DEBUGGING_INFO
54 #include "xcoffout.h" /* Needed for external data
55 declarations for e.g. AIX 4.x. */
58 #ifndef TRAMPOLINE_ALIGNMENT
59 #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
63 #define ASM_STABS_OP "\t.stabs\t"
66 /* The (assembler) name of the first globally-visible object output. */
67 const char *first_global_object_name;
68 const char *weak_global_object_name;
71 struct constant_descriptor_rtx;
75 #define MAX_RTX_HASH_TABLE 61
77 struct varasm_status GTY(())
79 /* Hash facility for making memory-constants
80 from constant rtl-expressions. It is used on RISC machines
81 where immediate integer arguments and constant addresses are restricted
82 so that such constants must be stored in memory.
84 This pool of constants is reinitialized for each function
85 so each function gets its own constants-pool that comes right before
87 struct constant_descriptor_rtx ** GTY ((length ("MAX_RTX_HASH_TABLE")))
88 x_const_rtx_hash_table;
89 struct pool_constant ** GTY ((length ("MAX_RTX_HASH_TABLE")))
90 x_const_rtx_sym_hash_table;
92 /* Pointers to first and last constant in pool. */
93 struct pool_constant *x_first_pool;
94 struct pool_constant *x_last_pool;
96 /* Current offset in constant pool (does not include any machine-specific
98 HOST_WIDE_INT x_pool_offset;
101 #define const_rtx_hash_table (cfun->varasm->x_const_rtx_hash_table)
102 #define const_rtx_sym_hash_table (cfun->varasm->x_const_rtx_sym_hash_table)
103 #define first_pool (cfun->varasm->x_first_pool)
104 #define last_pool (cfun->varasm->x_last_pool)
105 #define pool_offset (cfun->varasm->x_pool_offset)
107 /* Number for making the label on the next
108 constant that is stored in memory. */
110 static GTY(()) int const_labelno;
112 /* Number for making the label on the next
113 static variable internal to a function. */
115 static GTY(()) int var_labelno;
117 /* Carry information from ASM_DECLARE_OBJECT_NAME
118 to ASM_FINISH_DECLARE_OBJECT. */
120 int size_directive_output;
122 /* The last decl for which assemble_variable was called,
123 if it did ASM_DECLARE_OBJECT_NAME.
124 If the last call to assemble_variable didn't do that,
127 tree last_assemble_variable_decl;
129 /* RTX_UNCHANGING_P in a MEM can mean it is stored into, for initialization.
130 So giving constant the alias set for the type will allow such
131 initializations to appear to conflict with the load of the constant. We
132 avoid this by giving all constants an alias set for just constants.
133 Since there will be no stores to that alias set, nothing will ever
134 conflict with them. */
136 static HOST_WIDE_INT const_alias_set;
138 static const char *strip_reg_name PARAMS ((const char *));
139 static int contains_pointers_p PARAMS ((tree));
140 static void decode_addr_const PARAMS ((tree, struct addr_const *));
141 static unsigned int const_hash PARAMS ((tree));
142 static unsigned int const_hash_1 PARAMS ((tree));
143 static int compare_constant PARAMS ((tree, tree));
144 static tree copy_constant PARAMS ((tree));
145 static void output_constant_def_contents PARAMS ((tree, int, int));
146 static void decode_rtx_const PARAMS ((enum machine_mode, rtx,
147 struct rtx_const *));
148 static unsigned int const_hash_rtx PARAMS ((enum machine_mode, rtx));
149 static int compare_constant_rtx
150 PARAMS ((enum machine_mode, rtx, struct constant_descriptor_rtx *));
151 static struct constant_descriptor_rtx * record_constant_rtx
152 PARAMS ((enum machine_mode, rtx));
153 static struct pool_constant *find_pool_constant PARAMS ((struct function *, rtx));
154 static void mark_constant_pool PARAMS ((void));
155 static void mark_constants PARAMS ((rtx));
156 static int mark_constant PARAMS ((rtx *current_rtx, void *data));
157 static int output_addressed_constants PARAMS ((tree));
158 static unsigned HOST_WIDE_INT array_size_for_constructor PARAMS ((tree));
159 static unsigned min_align PARAMS ((unsigned, unsigned));
160 static void output_constructor PARAMS ((tree, HOST_WIDE_INT,
162 static void globalize_decl PARAMS ((tree));
163 static void maybe_assemble_visibility PARAMS ((tree));
164 static int in_named_entry_eq PARAMS ((const PTR, const PTR));
165 static hashval_t in_named_entry_hash PARAMS ((const PTR));
166 #ifdef ASM_OUTPUT_BSS
167 static void asm_output_bss PARAMS ((FILE *, tree, const char *, int, int));
169 #ifdef BSS_SECTION_ASM_OP
170 #ifdef ASM_OUTPUT_ALIGNED_BSS
171 static void asm_output_aligned_bss
172 PARAMS ((FILE *, tree, const char *, int, int)) ATTRIBUTE_UNUSED;
174 #endif /* BSS_SECTION_ASM_OP */
175 static hashval_t const_str_htab_hash PARAMS ((const void *x));
176 static int const_str_htab_eq PARAMS ((const void *x, const void *y));
177 static bool asm_emit_uninitialised PARAMS ((tree, const char*, int, int));
178 static void resolve_unique_section PARAMS ((tree, int, int));
179 static void mark_weak PARAMS ((tree));
181 enum in_section { no_section, in_text, in_data, in_named
182 #ifdef BSS_SECTION_ASM_OP
185 #ifdef CTORS_SECTION_ASM_OP
188 #ifdef DTORS_SECTION_ASM_OP
191 #ifdef READONLY_DATA_SECTION_ASM_OP
194 #ifdef EXTRA_SECTIONS
198 static GTY(()) enum in_section in_section = no_section;
200 /* Return a nonzero value if DECL has a section attribute. */
201 #ifndef IN_NAMED_SECTION
202 #define IN_NAMED_SECTION(DECL) \
203 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
204 && DECL_SECTION_NAME (DECL) != NULL_TREE)
207 /* Text of section name when in_section == in_named. */
208 static GTY(()) const char *in_named_name;
210 /* Hash table of flags that have been used for a particular named section. */
212 struct in_named_entry GTY(())
219 static GTY((param_is (struct in_named_entry))) htab_t in_named_htab;
221 /* Define functions like text_section for any extra sections. */
222 #ifdef EXTRA_SECTION_FUNCTIONS
223 EXTRA_SECTION_FUNCTIONS
226 /* Tell assembler to switch to text section. */
231 if (in_section != in_text)
233 in_section = in_text;
237 fprintf (asm_out_file, "%s\n", TEXT_SECTION_ASM_OP);
242 /* Tell assembler to switch to data section. */
247 if (in_section != in_data)
249 in_section = in_data;
250 if (flag_shared_data)
252 #ifdef SHARED_SECTION_ASM_OP
253 fprintf (asm_out_file, "%s\n", SHARED_SECTION_ASM_OP);
255 fprintf (asm_out_file, "%s\n", DATA_SECTION_ASM_OP);
259 fprintf (asm_out_file, "%s\n", DATA_SECTION_ASM_OP);
263 /* Tell assembler to switch to read-only data section. This is normally
267 readonly_data_section ()
269 #ifdef READONLY_DATA_SECTION
270 READONLY_DATA_SECTION (); /* Note this can call data_section. */
272 #ifdef READONLY_DATA_SECTION_ASM_OP
273 if (in_section != in_readonly_data)
275 in_section = in_readonly_data;
276 fputs (READONLY_DATA_SECTION_ASM_OP, asm_out_file);
277 fputc ('\n', asm_out_file);
285 /* Determine if we're in the text section. */
290 return in_section == in_text;
293 /* Determine if we're in the data section. */
298 return in_section == in_data;
301 /* Helper routines for maintaining in_named_htab. */
304 in_named_entry_eq (p1, p2)
308 const struct in_named_entry *old = p1;
309 const char *new = p2;
311 return strcmp (old->name, new) == 0;
315 in_named_entry_hash (p)
318 const struct in_named_entry *old = p;
319 return htab_hash_string (old->name);
322 /* If SECTION has been seen before as a named section, return the flags
323 that were used. Otherwise, return 0. Note, that 0 is a perfectly valid
324 set of flags for a section to have, so 0 does not mean that the section
325 has not been seen. */
328 get_named_section_flags (section)
331 struct in_named_entry **slot;
333 slot = (struct in_named_entry **)
334 htab_find_slot_with_hash (in_named_htab, section,
335 htab_hash_string (section), NO_INSERT);
337 return slot ? (*slot)->flags : 0;
340 /* Returns true if the section has been declared before. Sets internal
341 flag on this section in in_named_hash so subsequent calls on this
342 section will return false. */
345 named_section_first_declaration (name)
348 struct in_named_entry **slot;
350 slot = (struct in_named_entry **)
351 htab_find_slot_with_hash (in_named_htab, name,
352 htab_hash_string (name), NO_INSERT);
353 if (! (*slot)->declared)
355 (*slot)->declared = true;
365 /* Record FLAGS for SECTION. If SECTION was previously recorded with a
366 different set of flags, return false. */
369 set_named_section_flags (section, flags)
373 struct in_named_entry **slot, *entry;
375 slot = (struct in_named_entry **)
376 htab_find_slot_with_hash (in_named_htab, section,
377 htab_hash_string (section), INSERT);
382 entry = (struct in_named_entry *) ggc_alloc (sizeof (*entry));
384 entry->name = ggc_strdup (section);
385 entry->flags = flags;
386 entry->declared = false;
388 else if (entry->flags != flags)
394 /* Tell assembler to change to section NAME with attributes FLAGS. */
397 named_section_flags (name, flags)
401 if (in_section != in_named || strcmp (name, in_named_name) != 0)
403 if (! set_named_section_flags (name, flags))
406 (*targetm.asm_out.named_section) (name, flags);
408 if (flags & SECTION_FORGET)
409 in_section = no_section;
412 in_named_name = ggc_strdup (name);
413 in_section = in_named;
418 /* Tell assembler to change to section NAME for DECL.
419 If DECL is NULL, just switch to section NAME.
420 If NAME is NULL, get the name from DECL.
421 If RELOC is 1, the initializer for DECL contains relocs. */
424 named_section (decl, name, reloc)
431 if (decl != NULL_TREE && !DECL_P (decl))
434 name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
436 flags = (* targetm.section_type_flags) (decl, name, reloc);
438 /* Sanity check user variables for flag changes. Non-user
439 section flag changes will abort in named_section_flags.
440 However, don't complain if SECTION_OVERRIDE is set.
441 We trust that the setter knows that it is safe to ignore
442 the default flags for this decl. */
443 if (decl && ! set_named_section_flags (name, flags))
445 flags = get_named_section_flags (name);
446 if ((flags & SECTION_OVERRIDE) == 0)
447 error_with_decl (decl, "%s causes a section type conflict");
450 named_section_flags (name, flags);
453 /* If required, set DECL_SECTION_NAME to a unique name. */
456 resolve_unique_section (decl, reloc, flag_function_or_data_sections)
458 int reloc ATTRIBUTE_UNUSED;
459 int flag_function_or_data_sections;
461 if (DECL_SECTION_NAME (decl) == NULL_TREE
462 && targetm.have_named_sections
463 && (flag_function_or_data_sections
464 || DECL_ONE_ONLY (decl)))
465 (*targetm.asm_out.unique_section) (decl, reloc);
468 #ifdef BSS_SECTION_ASM_OP
470 /* Tell the assembler to switch to the bss section. */
475 if (in_section != in_bss)
477 #ifdef SHARED_BSS_SECTION_ASM_OP
478 if (flag_shared_data)
479 fprintf (asm_out_file, "%s\n", SHARED_BSS_SECTION_ASM_OP);
482 fprintf (asm_out_file, "%s\n", BSS_SECTION_ASM_OP);
488 #ifdef ASM_OUTPUT_BSS
490 /* Utility function for ASM_OUTPUT_BSS for targets to use if
491 they don't support alignments in .bss.
492 ??? It is believed that this function will work in most cases so such
493 support is localized here. */
496 asm_output_bss (file, decl, name, size, rounded)
498 tree decl ATTRIBUTE_UNUSED;
500 int size ATTRIBUTE_UNUSED, rounded;
502 (*targetm.asm_out.globalize_label) (file, name);
504 #ifdef ASM_DECLARE_OBJECT_NAME
505 last_assemble_variable_decl = decl;
506 ASM_DECLARE_OBJECT_NAME (file, name, decl);
508 /* Standard thing is just output label for the object. */
509 ASM_OUTPUT_LABEL (file, name);
510 #endif /* ASM_DECLARE_OBJECT_NAME */
511 ASM_OUTPUT_SKIP (file, rounded ? rounded : 1);
516 #ifdef ASM_OUTPUT_ALIGNED_BSS
518 /* Utility function for targets to use in implementing
519 ASM_OUTPUT_ALIGNED_BSS.
520 ??? It is believed that this function will work in most cases so such
521 support is localized here. */
524 asm_output_aligned_bss (file, decl, name, size, align)
526 tree decl ATTRIBUTE_UNUSED;
531 ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
532 #ifdef ASM_DECLARE_OBJECT_NAME
533 last_assemble_variable_decl = decl;
534 ASM_DECLARE_OBJECT_NAME (file, name, decl);
536 /* Standard thing is just output label for the object. */
537 ASM_OUTPUT_LABEL (file, name);
538 #endif /* ASM_DECLARE_OBJECT_NAME */
539 ASM_OUTPUT_SKIP (file, size ? size : 1);
544 #endif /* BSS_SECTION_ASM_OP */
546 /* Switch to the section for function DECL.
548 If DECL is NULL_TREE, switch to the text section.
549 ??? It's not clear that we will ever be passed NULL_TREE, but it's
550 safer to handle it. */
553 function_section (decl)
556 if (decl != NULL_TREE
557 && DECL_SECTION_NAME (decl) != NULL_TREE)
558 named_section (decl, (char *) 0, 0);
563 /* Switch to section for variable DECL. RELOC is the same as the
564 argument to SELECT_SECTION. */
567 variable_section (decl, reloc)
571 if (IN_NAMED_SECTION (decl))
572 named_section (decl, NULL, reloc);
574 (*targetm.asm_out.select_section) (decl, reloc, DECL_ALIGN (decl));
577 /* Tell assembler to switch to the section for string merging. */
580 mergeable_string_section (decl, align, flags)
581 tree decl ATTRIBUTE_UNUSED;
582 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED;
583 unsigned int flags ATTRIBUTE_UNUSED;
585 #ifdef HAVE_GAS_SHF_MERGE
586 if (flag_merge_constants
587 && TREE_CODE (decl) == STRING_CST
588 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
590 && TREE_STRING_LENGTH (decl) >= int_size_in_bytes (TREE_TYPE (decl)))
592 enum machine_mode mode;
593 unsigned int modesize;
598 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
599 modesize = GET_MODE_BITSIZE (mode);
600 if (modesize >= 8 && modesize <= 256
601 && (modesize & (modesize - 1)) == 0)
603 if (align < modesize)
606 str = TREE_STRING_POINTER (decl);
607 len = TREE_STRING_LENGTH (decl);
608 unit = GET_MODE_SIZE (mode);
610 /* Check for embedded NUL characters. */
611 for (i = 0; i < len; i += unit)
613 for (j = 0; j < unit; j++)
614 if (str[i + j] != '\0')
621 sprintf (name, ".rodata.str%d.%d", modesize / 8,
623 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
624 if (!i && modesize < align)
626 /* A "" string with requested alignment greater than
627 character size might cause a problem:
628 if some other string required even bigger
629 alignment than "", then linker might think the
630 "" is just part of padding after some other string
631 and not put it into the hash table initially.
632 But this means "" could have smaller alignment
634 #ifdef ASM_OUTPUT_SECTION_START
635 named_section_flags (name, flags);
636 ASM_OUTPUT_SECTION_START (asm_out_file);
638 readonly_data_section ();
643 named_section_flags (name, flags);
649 readonly_data_section ();
652 /* Tell assembler to switch to the section for constant merging. */
655 mergeable_constant_section (mode, align, flags)
656 enum machine_mode mode ATTRIBUTE_UNUSED;
657 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED;
658 unsigned int flags ATTRIBUTE_UNUSED;
660 #ifdef HAVE_GAS_SHF_MERGE
661 unsigned int modesize = GET_MODE_BITSIZE (mode);
663 if (flag_merge_constants
669 && (align & (align - 1)) == 0)
673 sprintf (name, ".rodata.cst%d", (int) (align / 8));
674 flags |= (align / 8) | SECTION_MERGE;
675 named_section_flags (name, flags);
679 readonly_data_section ();
682 /* Given NAME, a putative register name, discard any customary prefixes. */
685 strip_reg_name (name)
688 #ifdef REGISTER_PREFIX
689 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
690 name += strlen (REGISTER_PREFIX);
692 if (name[0] == '%' || name[0] == '#')
697 /* Decode an `asm' spec for a declaration as a register name.
698 Return the register number, or -1 if nothing specified,
699 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
700 or -3 if ASMSPEC is `cc' and is not recognized,
701 or -4 if ASMSPEC is `memory' and is not recognized.
702 Accept an exact spelling or a decimal number.
703 Prefixes such as % are optional. */
706 decode_reg_name (asmspec)
713 /* Get rid of confusing prefixes. */
714 asmspec = strip_reg_name (asmspec);
716 /* Allow a decimal number as a "register name". */
717 for (i = strlen (asmspec) - 1; i >= 0; i--)
718 if (! ISDIGIT (asmspec[i]))
720 if (asmspec[0] != 0 && i < 0)
723 if (i < FIRST_PSEUDO_REGISTER && i >= 0)
729 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
731 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
734 #ifdef ADDITIONAL_REGISTER_NAMES
736 static const struct { const char *const name; const int number; } table[]
737 = ADDITIONAL_REGISTER_NAMES;
739 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
740 if (! strcmp (asmspec, table[i].name))
741 return table[i].number;
743 #endif /* ADDITIONAL_REGISTER_NAMES */
745 if (!strcmp (asmspec, "memory"))
748 if (!strcmp (asmspec, "cc"))
757 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
758 have static storage duration. In other words, it should not be an
759 automatic variable, including PARM_DECLs.
761 There is, however, one exception: this function handles variables
762 explicitly placed in a particular register by the user.
764 ASMSPEC, if not 0, is the string which the user specified as the
765 assembler symbol name.
767 This is never called for PARM_DECL nodes. */
770 make_decl_rtl (decl, asmspec)
774 int top_level = (DECL_CONTEXT (decl) == NULL_TREE);
775 const char *name = 0;
776 const char *new_name = 0;
780 /* Check that we are not being given an automatic variable. */
781 /* A weak alias has TREE_PUBLIC set but not the other bits. */
782 if (TREE_CODE (decl) == PARM_DECL
783 || TREE_CODE (decl) == RESULT_DECL
784 || (TREE_CODE (decl) == VAR_DECL
785 && !TREE_STATIC (decl)
786 && !TREE_PUBLIC (decl)
787 && !DECL_EXTERNAL (decl)
788 && !DECL_REGISTER (decl)))
790 /* And that we were not given a type or a label. */
791 else if (TREE_CODE (decl) == TYPE_DECL
792 || TREE_CODE (decl) == LABEL_DECL)
795 /* For a duplicate declaration, we can be called twice on the
796 same DECL node. Don't discard the RTL already made. */
797 if (DECL_RTL_SET_P (decl))
799 /* If the old RTL had the wrong mode, fix the mode. */
800 if (GET_MODE (DECL_RTL (decl)) != DECL_MODE (decl))
801 SET_DECL_RTL (decl, adjust_address_nv (DECL_RTL (decl),
802 DECL_MODE (decl), 0));
804 /* ??? Another way to do this would be to maintain a hashed
805 table of such critters. Instead of adding stuff to a DECL
806 to give certain attributes to it, we could use an external
807 hash map from DECL to set of attributes. */
809 /* Let the target reassign the RTL if it wants.
810 This is necessary, for example, when one machine specific
811 decl attribute overrides another. */
812 (* targetm.encode_section_info) (decl, DECL_RTL (decl), false);
816 new_name = name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
818 reg_number = decode_reg_name (asmspec);
819 if (reg_number == -2)
821 /* ASMSPEC is given, and not the name of a register. Mark the
822 name with a star so assemble_name won't munge it. */
823 char *starred = alloca (strlen (asmspec) + 2);
825 strcpy (starred + 1, asmspec);
829 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
831 /* First detect errors in declaring global registers. */
832 if (reg_number == -1)
833 error_with_decl (decl, "register name not specified for `%s'");
834 else if (reg_number < 0)
835 error_with_decl (decl, "invalid register name for `%s'");
836 else if (TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
837 error_with_decl (decl,
838 "data type of `%s' isn't suitable for a register");
839 else if (! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
840 error_with_decl (decl,
841 "register specified for `%s' isn't suitable for data type");
842 /* Now handle properly declared static register variables. */
847 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
849 DECL_INITIAL (decl) = 0;
850 error ("global register variable has initial value");
852 if (TREE_THIS_VOLATILE (decl))
853 warning ("volatile register variables don't work as you might wish");
855 /* If the user specified one of the eliminables registers here,
856 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
857 confused with that register and be eliminated. This usage is
858 somewhat suspect... */
860 SET_DECL_RTL (decl, gen_rtx_raw_REG (DECL_MODE (decl), reg_number));
861 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
862 REG_USERVAR_P (DECL_RTL (decl)) = 1;
864 if (TREE_STATIC (decl))
866 /* Make this register global, so not usable for anything
868 #ifdef ASM_DECLARE_REGISTER_GLOBAL
869 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
871 nregs = HARD_REGNO_NREGS (reg_number, DECL_MODE (decl));
873 globalize_reg (reg_number + --nregs);
876 /* As a register variable, it has no section. */
881 /* Now handle ordinary static variables and functions (in memory).
882 Also handle vars declared register invalidly. */
884 if (reg_number >= 0 || reg_number == -3)
885 error_with_decl (decl,
886 "register name given for non-register variable `%s'");
888 /* Specifying a section attribute on a variable forces it into a
889 non-.bss section, and thus it cannot be common. */
890 if (TREE_CODE (decl) == VAR_DECL
891 && DECL_SECTION_NAME (decl) != NULL_TREE
892 && DECL_INITIAL (decl) == NULL_TREE
893 && DECL_COMMON (decl))
894 DECL_COMMON (decl) = 0;
896 /* Variables can't be both common and weak. */
897 if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl))
898 DECL_COMMON (decl) = 0;
900 /* Can't use just the variable's own name for a variable
901 whose scope is less than the whole file, unless it's a member
902 of a local class (which will already be unambiguous).
903 Concatenate a distinguishing number. */
904 if (!top_level && !TREE_PUBLIC (decl)
905 && ! (DECL_CONTEXT (decl) && TYPE_P (DECL_CONTEXT (decl)))
907 && name == IDENTIFIER_POINTER (DECL_NAME (decl)))
911 ASM_FORMAT_PRIVATE_NAME (label, name, var_labelno);
916 if (name != new_name)
918 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (new_name));
919 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
922 x = gen_rtx_SYMBOL_REF (Pmode, name);
923 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
924 SYMBOL_REF_DECL (x) = decl;
926 x = gen_rtx_MEM (DECL_MODE (decl), x);
927 if (TREE_CODE (decl) != FUNCTION_DECL)
928 set_mem_attributes (x, decl, 1);
929 SET_DECL_RTL (decl, x);
931 /* Optionally set flags or add text to the name to record information
932 such as that it is a function name.
933 If the name is changed, the macro ASM_OUTPUT_LABELREF
934 will have to know how to strip this information. */
935 (* targetm.encode_section_info) (decl, DECL_RTL (decl), true);
938 /* Make the rtl for variable VAR be volatile.
939 Use this only for static variables. */
942 make_var_volatile (var)
945 if (GET_CODE (DECL_RTL (var)) != MEM)
948 MEM_VOLATILE_P (DECL_RTL (var)) = 1;
951 /* Output a string of literal assembler code
952 for an `asm' keyword used between functions. */
955 assemble_asm (string)
960 if (TREE_CODE (string) == ADDR_EXPR)
961 string = TREE_OPERAND (string, 0);
963 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
966 /* Record an element in the table of global destructors. SYMBOL is
967 a SYMBOL_REF of the function to be called; PRIORITY is a number
968 between 0 and MAX_INIT_PRIORITY. */
971 default_stabs_asm_out_destructor (symbol, priority)
973 int priority ATTRIBUTE_UNUSED;
975 /* Tell GNU LD that this is part of the static destructor set.
976 This will work for any system that uses stabs, most usefully
978 fprintf (asm_out_file, "%s\"___DTOR_LIST__\",22,0,0,", ASM_STABS_OP);
979 assemble_name (asm_out_file, XSTR (symbol, 0));
980 fputc ('\n', asm_out_file);
984 default_named_section_asm_out_destructor (symbol, priority)
988 const char *section = ".dtors";
991 /* ??? This only works reliably with the GNU linker. */
992 if (priority != DEFAULT_INIT_PRIORITY)
994 sprintf (buf, ".dtors.%.5u",
995 /* Invert the numbering so the linker puts us in the proper
996 order; constructors are run from right to left, and the
997 linker sorts in increasing order. */
998 MAX_INIT_PRIORITY - priority);
1002 named_section_flags (section, SECTION_WRITE);
1003 assemble_align (POINTER_SIZE);
1004 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1007 #ifdef DTORS_SECTION_ASM_OP
1011 if (in_section != in_dtors)
1013 in_section = in_dtors;
1014 fputs (DTORS_SECTION_ASM_OP, asm_out_file);
1015 fputc ('\n', asm_out_file);
1020 default_dtor_section_asm_out_destructor (symbol, priority)
1022 int priority ATTRIBUTE_UNUSED;
1025 assemble_align (POINTER_SIZE);
1026 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1030 /* Likewise for global constructors. */
1033 default_stabs_asm_out_constructor (symbol, priority)
1035 int priority ATTRIBUTE_UNUSED;
1037 /* Tell GNU LD that this is part of the static destructor set.
1038 This will work for any system that uses stabs, most usefully
1040 fprintf (asm_out_file, "%s\"___CTOR_LIST__\",22,0,0,", ASM_STABS_OP);
1041 assemble_name (asm_out_file, XSTR (symbol, 0));
1042 fputc ('\n', asm_out_file);
1046 default_named_section_asm_out_constructor (symbol, priority)
1050 const char *section = ".ctors";
1053 /* ??? This only works reliably with the GNU linker. */
1054 if (priority != DEFAULT_INIT_PRIORITY)
1056 sprintf (buf, ".ctors.%.5u",
1057 /* Invert the numbering so the linker puts us in the proper
1058 order; constructors are run from right to left, and the
1059 linker sorts in increasing order. */
1060 MAX_INIT_PRIORITY - priority);
1064 named_section_flags (section, SECTION_WRITE);
1065 assemble_align (POINTER_SIZE);
1066 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1069 #ifdef CTORS_SECTION_ASM_OP
1073 if (in_section != in_ctors)
1075 in_section = in_ctors;
1076 fputs (CTORS_SECTION_ASM_OP, asm_out_file);
1077 fputc ('\n', asm_out_file);
1082 default_ctor_section_asm_out_constructor (symbol, priority)
1084 int priority ATTRIBUTE_UNUSED;
1087 assemble_align (POINTER_SIZE);
1088 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1092 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1093 a nonzero value if the constant pool should be output before the
1094 start of the function, or a zero value if the pool should output
1095 after the end of the function. The default is to put it before the
1098 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1099 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1102 /* Output assembler code for the constant pool of a function and associated
1103 with defining the name of the function. DECL describes the function.
1104 NAME is the function's name. For the constant pool, we use the current
1105 constant pool data. */
1108 assemble_start_function (decl, fnname)
1114 /* The following code does not need preprocessing in the assembler. */
1118 if (CONSTANT_POOL_BEFORE_FUNCTION)
1119 output_constant_pool (fnname, decl);
1121 resolve_unique_section (decl, 0, flag_function_sections);
1122 function_section (decl);
1124 /* Tell assembler to move to target machine's alignment for functions. */
1125 align = floor_log2 (FUNCTION_BOUNDARY / BITS_PER_UNIT);
1126 if (align < force_align_functions_log)
1127 align = force_align_functions_log;
1130 ASM_OUTPUT_ALIGN (asm_out_file, align);
1133 /* Handle a user-specified function alignment.
1134 Note that we still need to align to FUNCTION_BOUNDARY, as above,
1135 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1136 if (align_functions_log > align
1137 && cfun->function_frequency != FUNCTION_FREQUENCY_UNLIKELY_EXECUTED)
1139 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1140 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1141 align_functions_log, align_functions - 1);
1143 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1147 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1148 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1151 (*debug_hooks->begin_function) (decl);
1153 /* Make function name accessible from other files, if appropriate. */
1155 if (TREE_PUBLIC (decl))
1157 if (! first_global_object_name)
1162 p = (* targetm.strip_name_encoding) (fnname);
1165 if (! DECL_WEAK (decl) && ! DECL_ONE_ONLY (decl))
1166 first_global_object_name = name;
1168 weak_global_object_name = name;
1171 globalize_decl (decl);
1173 maybe_assemble_visibility (decl);
1176 /* Do any machine/system dependent processing of the function name */
1177 #ifdef ASM_DECLARE_FUNCTION_NAME
1178 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1180 /* Standard thing is just output label for the function. */
1181 ASM_OUTPUT_LABEL (asm_out_file, fnname);
1182 #endif /* ASM_DECLARE_FUNCTION_NAME */
1185 /* Output assembler code associated with defining the size of the
1186 function. DECL describes the function. NAME is the function's name. */
1189 assemble_end_function (decl, fnname)
1193 #ifdef ASM_DECLARE_FUNCTION_SIZE
1194 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1196 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1198 output_constant_pool (fnname, decl);
1199 function_section (decl); /* need to switch back */
1203 /* Assemble code to leave SIZE bytes of zeros. */
1206 assemble_zeros (size)
1209 /* Do no output if -fsyntax-only. */
1210 if (flag_syntax_only)
1213 #ifdef ASM_NO_SKIP_IN_TEXT
1214 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1215 so we must output 0s explicitly in the text section. */
1216 if (ASM_NO_SKIP_IN_TEXT && in_text_section ())
1219 for (i = 0; i < size; i++)
1220 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1225 ASM_OUTPUT_SKIP (asm_out_file, size);
1228 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1231 assemble_align (align)
1234 if (align > BITS_PER_UNIT)
1236 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1240 /* Assemble a string constant with the specified C string as contents. */
1243 assemble_string (p, size)
1250 /* If the string is very long, split it up. */
1254 int thissize = size - pos;
1255 if (thissize > maximum)
1258 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1266 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1267 #define ASM_EMIT_LOCAL(decl, name, size, rounded) \
1268 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name, size, DECL_ALIGN (decl))
1270 #if defined ASM_OUTPUT_ALIGNED_LOCAL
1271 #define ASM_EMIT_LOCAL(decl, name, size, rounded) \
1272 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, DECL_ALIGN (decl))
1274 #define ASM_EMIT_LOCAL(decl, name, size, rounded) \
1275 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded)
1279 #if defined ASM_OUTPUT_ALIGNED_BSS
1280 #define ASM_EMIT_BSS(decl, name, size, rounded) \
1281 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size, DECL_ALIGN (decl))
1283 #if defined ASM_OUTPUT_BSS
1284 #define ASM_EMIT_BSS(decl, name, size, rounded) \
1285 ASM_OUTPUT_BSS (asm_out_file, decl, name, size, rounded)
1291 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1292 #define ASM_EMIT_COMMON(decl, name, size, rounded) \
1293 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name, size, DECL_ALIGN (decl))
1295 #if defined ASM_OUTPUT_ALIGNED_COMMON
1296 #define ASM_EMIT_COMMON(decl, name, size, rounded) \
1297 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size, DECL_ALIGN (decl))
1299 #define ASM_EMIT_COMMON(decl, name, size, rounded) \
1300 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded)
1305 asm_emit_uninitialised (decl, name, size, rounded)
1308 int size ATTRIBUTE_UNUSED;
1309 int rounded ATTRIBUTE_UNUSED;
1317 destination = asm_dest_local;
1319 /* ??? We should handle .bss via select_section mechanisms rather than
1320 via special target hooks. That would eliminate this special case. */
1321 if (TREE_PUBLIC (decl))
1323 if (!DECL_COMMON (decl))
1325 destination = asm_dest_bss;
1330 destination = asm_dest_common;
1333 if (destination == asm_dest_bss)
1334 globalize_decl (decl);
1335 resolve_unique_section (decl, 0, flag_data_sections);
1337 if (flag_shared_data)
1339 switch (destination)
1341 #ifdef ASM_OUTPUT_SHARED_BSS
1343 ASM_OUTPUT_SHARED_BSS (asm_out_file, decl, name, size, rounded);
1346 #ifdef ASM_OUTPUT_SHARED_COMMON
1347 case asm_dest_common:
1348 ASM_OUTPUT_SHARED_COMMON (asm_out_file, name, size, rounded);
1351 #ifdef ASM_OUTPUT_SHARED_LOCAL
1352 case asm_dest_local:
1353 ASM_OUTPUT_SHARED_LOCAL (asm_out_file, name, size, rounded);
1361 switch (destination)
1365 ASM_EMIT_BSS (decl, name, size, rounded);
1368 case asm_dest_common:
1369 ASM_EMIT_COMMON (decl, name, size, rounded);
1371 case asm_dest_local:
1372 ASM_EMIT_LOCAL (decl, name, size, rounded);
1381 /* Assemble everything that is needed for a variable or function declaration.
1382 Not used for automatic variables, and not used for function definitions.
1383 Should not be called for variables of incomplete structure type.
1385 TOP_LEVEL is nonzero if this variable has file scope.
1386 AT_END is nonzero if this is the special handling, at end of compilation,
1387 to define things that have had only tentative definitions.
1388 DONT_OUTPUT_DATA if nonzero means don't actually output the
1389 initial value (that will be done by the caller). */
1392 assemble_variable (decl, top_level, at_end, dont_output_data)
1394 int top_level ATTRIBUTE_UNUSED;
1395 int at_end ATTRIBUTE_UNUSED;
1396 int dont_output_data;
1403 last_assemble_variable_decl = 0;
1405 /* Normally no need to say anything here for external references,
1406 since assemble_external is called by the language-specific code
1407 when a declaration is first seen. */
1409 if (DECL_EXTERNAL (decl))
1412 /* Output no assembler code for a function declaration.
1413 Only definitions of functions output anything. */
1415 if (TREE_CODE (decl) == FUNCTION_DECL)
1418 /* Do nothing for global register variables. */
1419 if (DECL_RTL_SET_P (decl) && GET_CODE (DECL_RTL (decl)) == REG)
1421 TREE_ASM_WRITTEN (decl) = 1;
1425 /* If type was incomplete when the variable was declared,
1426 see if it is complete now. */
1428 if (DECL_SIZE (decl) == 0)
1429 layout_decl (decl, 0);
1431 /* Still incomplete => don't allocate it; treat the tentative defn
1432 (which is what it must have been) as an `extern' reference. */
1434 if (!dont_output_data && DECL_SIZE (decl) == 0)
1436 error_with_file_and_line (DECL_SOURCE_FILE (decl),
1437 DECL_SOURCE_LINE (decl),
1438 "storage size of `%s' isn't known",
1439 IDENTIFIER_POINTER (DECL_NAME (decl)));
1440 TREE_ASM_WRITTEN (decl) = 1;
1444 /* The first declaration of a variable that comes through this function
1445 decides whether it is global (in C, has external linkage)
1446 or local (in C, has internal linkage). So do nothing more
1447 if this function has already run. */
1449 if (TREE_ASM_WRITTEN (decl))
1452 /* Make sure targetm.encode_section_info is invoked before we set
1454 decl_rtl = DECL_RTL (decl);
1456 TREE_ASM_WRITTEN (decl) = 1;
1458 /* Do no output if -fsyntax-only. */
1459 if (flag_syntax_only)
1464 if (! dont_output_data
1465 && ! host_integerp (DECL_SIZE_UNIT (decl), 1))
1467 error_with_decl (decl, "size of variable `%s' is too large");
1471 name = XSTR (XEXP (decl_rtl, 0), 0);
1472 if (TREE_PUBLIC (decl) && DECL_NAME (decl)
1473 && ! first_global_object_name
1474 && ! (DECL_COMMON (decl) && (DECL_INITIAL (decl) == 0
1475 || DECL_INITIAL (decl) == error_mark_node))
1476 && ! DECL_WEAK (decl)
1477 && ! DECL_ONE_ONLY (decl))
1482 p = (* targetm.strip_name_encoding) (name);
1483 xname = xstrdup (p);
1484 first_global_object_name = xname;
1487 /* Compute the alignment of this data. */
1489 align = DECL_ALIGN (decl);
1491 /* In the case for initialing an array whose length isn't specified,
1492 where we have not yet been able to do the layout,
1493 figure out the proper alignment now. */
1494 if (dont_output_data && DECL_SIZE (decl) == 0
1495 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
1496 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
1498 /* Some object file formats have a maximum alignment which they support.
1499 In particular, a.out format supports a maximum alignment of 4. */
1500 #ifndef MAX_OFILE_ALIGNMENT
1501 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
1503 if (align > MAX_OFILE_ALIGNMENT)
1505 warning_with_decl (decl,
1506 "alignment of `%s' is greater than maximum object file alignment. Using %d",
1507 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
1508 align = MAX_OFILE_ALIGNMENT;
1511 /* On some machines, it is good to increase alignment sometimes. */
1512 if (! DECL_USER_ALIGN (decl))
1514 #ifdef DATA_ALIGNMENT
1515 align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1517 #ifdef CONSTANT_ALIGNMENT
1518 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
1519 align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl), align);
1523 /* Reset the alignment in case we have made it tighter, so we can benefit
1524 from it in get_pointer_alignment. */
1525 DECL_ALIGN (decl) = align;
1526 set_mem_align (decl_rtl, align);
1528 if (TREE_PUBLIC (decl))
1529 maybe_assemble_visibility (decl);
1531 /* Output any data that we will need to use the address of. */
1532 if (DECL_INITIAL (decl) == error_mark_node)
1533 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
1534 else if (DECL_INITIAL (decl))
1535 reloc = output_addressed_constants (DECL_INITIAL (decl));
1536 resolve_unique_section (decl, reloc, flag_data_sections);
1538 /* Handle uninitialized definitions. */
1540 /* If the decl has been given an explicit section name, then it
1541 isn't common, and shouldn't be handled as such. */
1542 if (DECL_SECTION_NAME (decl) || dont_output_data)
1544 /* We don't implement common thread-local data at present. */
1545 else if (DECL_THREAD_LOCAL (decl))
1547 if (DECL_COMMON (decl))
1548 sorry ("thread-local COMMON data not implemented");
1550 else if (DECL_INITIAL (decl) == 0
1551 || DECL_INITIAL (decl) == error_mark_node
1552 || (flag_zero_initialized_in_bss
1553 /* Leave constant zeroes in .rodata so they can be shared. */
1554 && !TREE_READONLY (decl)
1555 && initializer_zerop (DECL_INITIAL (decl))))
1557 unsigned HOST_WIDE_INT size = tree_low_cst (DECL_SIZE_UNIT (decl), 1);
1558 unsigned HOST_WIDE_INT rounded = size;
1560 /* Don't allocate zero bytes of common,
1561 since that means "undefined external" in the linker. */
1565 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1566 so that each uninitialized object starts on such a boundary. */
1567 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
1568 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1569 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1571 #if !defined(ASM_OUTPUT_ALIGNED_COMMON) && !defined(ASM_OUTPUT_ALIGNED_DECL_COMMON) && !defined(ASM_OUTPUT_ALIGNED_BSS)
1572 if ((unsigned HOST_WIDE_INT) DECL_ALIGN (decl) / BITS_PER_UNIT > rounded)
1574 (decl, "requested alignment for %s is greater than implemented alignment of %d",rounded);
1577 /* If the target cannot output uninitialized but not common global data
1578 in .bss, then we have to use .data, so fall through. */
1579 if (asm_emit_uninitialised (decl, name, size, rounded))
1583 /* Handle initialized definitions.
1584 Also handle uninitialized global definitions if -fno-common and the
1585 target doesn't support ASM_OUTPUT_BSS. */
1587 /* First make the assembler name(s) global if appropriate. */
1588 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
1589 globalize_decl (decl);
1591 /* Switch to the appropriate section. */
1592 variable_section (decl, reloc);
1594 /* dbxout.c needs to know this. */
1595 if (in_text_section ())
1596 DECL_IN_TEXT_SECTION (decl) = 1;
1598 /* Output the alignment of this data. */
1599 if (align > BITS_PER_UNIT)
1601 ASM_OUTPUT_ALIGN (asm_out_file,
1602 floor_log2 (DECL_ALIGN (decl) / BITS_PER_UNIT));
1605 /* Do any machine/system dependent processing of the object. */
1606 #ifdef ASM_DECLARE_OBJECT_NAME
1607 last_assemble_variable_decl = decl;
1608 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
1610 /* Standard thing is just output label for the object. */
1611 ASM_OUTPUT_LABEL (asm_out_file, name);
1612 #endif /* ASM_DECLARE_OBJECT_NAME */
1614 if (!dont_output_data)
1616 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
1617 /* Output the actual data. */
1618 output_constant (DECL_INITIAL (decl),
1619 tree_low_cst (DECL_SIZE_UNIT (decl), 1),
1622 /* Leave space for it. */
1623 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl), 1));
1627 /* Return 1 if type TYPE contains any pointers. */
1630 contains_pointers_p (type)
1633 switch (TREE_CODE (type))
1636 case REFERENCE_TYPE:
1637 /* I'm not sure whether OFFSET_TYPE needs this treatment,
1638 so I'll play safe and return 1. */
1644 case QUAL_UNION_TYPE:
1647 /* For a type that has fields, see if the fields have pointers. */
1648 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
1649 if (TREE_CODE (fields) == FIELD_DECL
1650 && contains_pointers_p (TREE_TYPE (fields)))
1656 /* An array type contains pointers if its element type does. */
1657 return contains_pointers_p (TREE_TYPE (type));
1664 /* Output something to declare an external symbol to the assembler.
1665 (Most assemblers don't need this, so we normally output nothing.)
1666 Do nothing if DECL is not external. */
1669 assemble_external (decl)
1670 tree decl ATTRIBUTE_UNUSED;
1672 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
1673 main body of this code is only rarely exercised. To provide some
1674 testing, on all platforms, we make sure that the ASM_OUT_FILE is
1675 open. If it's not, we should not be calling this function. */
1679 #ifdef ASM_OUTPUT_EXTERNAL
1680 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
1682 rtx rtl = DECL_RTL (decl);
1684 if (GET_CODE (rtl) == MEM && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
1685 && ! SYMBOL_REF_USED (XEXP (rtl, 0)))
1687 /* Some systems do require some output. */
1688 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
1689 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
1695 /* Similar, for calling a library function FUN. */
1698 assemble_external_libcall (fun)
1699 rtx fun ATTRIBUTE_UNUSED;
1701 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
1702 /* Declare library function name external when first used, if nec. */
1703 if (! SYMBOL_REF_USED (fun))
1705 SYMBOL_REF_USED (fun) = 1;
1706 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file, fun);
1711 /* Assemble a label named NAME. */
1714 assemble_label (name)
1717 ASM_OUTPUT_LABEL (asm_out_file, name);
1720 /* Output to FILE a reference to the assembler name of a C-level name NAME.
1721 If NAME starts with a *, the rest of NAME is output verbatim.
1722 Otherwise NAME is transformed in an implementation-defined way
1723 (usually by the addition of an underscore).
1724 Many macros in the tm file are defined to call this function. */
1727 assemble_name (file, name)
1731 const char *real_name;
1734 real_name = (* targetm.strip_name_encoding) (name);
1736 id = maybe_get_identifier (real_name);
1738 TREE_SYMBOL_REFERENCED (id) = 1;
1741 fputs (&name[1], file);
1743 ASM_OUTPUT_LABELREF (file, name);
1746 /* Allocate SIZE bytes writable static space with a gensym name
1747 and return an RTX to refer to its address. */
1750 assemble_static_space (size)
1754 const char *namestring;
1758 if (flag_shared_data)
1762 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
1764 namestring = ggc_strdup (name);
1766 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
1767 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
1769 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
1770 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
1773 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
1774 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
1777 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1778 so that each uninitialized object starts on such a boundary. */
1779 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
1780 int rounded ATTRIBUTE_UNUSED
1781 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
1782 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1783 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1784 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1791 /* Assemble the static constant template for function entry trampolines.
1792 This is done at most once per compilation.
1793 Returns an RTX for the address of the template. */
1795 #ifdef TRAMPOLINE_TEMPLATE
1797 assemble_trampoline_template ()
1804 /* By default, put trampoline templates in read-only data section. */
1806 #ifdef TRAMPOLINE_SECTION
1807 TRAMPOLINE_SECTION ();
1809 readonly_data_section ();
1812 /* Write the assembler code to define one. */
1813 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
1816 ASM_OUTPUT_ALIGN (asm_out_file, align);
1819 (*targetm.asm_out.internal_label) (asm_out_file, "LTRAMP", 0);
1820 TRAMPOLINE_TEMPLATE (asm_out_file);
1822 /* Record the rtl to refer to it. */
1823 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
1824 name = ggc_strdup (label);
1825 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
1826 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
1832 /* A and B are either alignments or offsets. Return the minimum alignment
1833 that may be assumed after adding the two together. */
1835 static inline unsigned
1839 return (a | b) & -(a | b);
1842 /* Return the assembler directive for creating a given kind of integer
1843 object. SIZE is the number of bytes in the object and ALIGNED_P
1844 indicates whether it is known to be aligned. Return NULL if the
1845 assembly dialect has no such directive.
1847 The returned string should be printed at the start of a new line and
1848 be followed immediately by the object's initial value. */
1851 integer_asm_op (size, aligned_p)
1855 struct asm_int_op *ops;
1858 ops = &targetm.asm_out.aligned_op;
1860 ops = &targetm.asm_out.unaligned_op;
1865 return targetm.asm_out.byte_op;
1879 /* Use directive OP to assemble an integer object X. Print OP at the
1880 start of the line, followed immediately by the value of X. */
1883 assemble_integer_with_op (op, x)
1887 fputs (op, asm_out_file);
1888 output_addr_const (asm_out_file, x);
1889 fputc ('\n', asm_out_file);
1892 /* The default implementation of the asm_out.integer target hook. */
1895 default_assemble_integer (x, size, aligned_p)
1896 rtx x ATTRIBUTE_UNUSED;
1897 unsigned int size ATTRIBUTE_UNUSED;
1898 int aligned_p ATTRIBUTE_UNUSED;
1900 const char *op = integer_asm_op (size, aligned_p);
1901 return op && (assemble_integer_with_op (op, x), true);
1904 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
1905 the alignment of the integer in bits. Return 1 if we were able to output
1906 the constant, otherwise 0. If FORCE is nonzero, abort if we can't output
1910 assemble_integer (x, size, align, force)
1918 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
1920 /* See if the target hook can handle this kind of object. */
1921 if ((*targetm.asm_out.integer) (x, size, aligned_p))
1924 /* If the object is a multi-byte one, try splitting it up. Split
1925 it into words it if is multi-word, otherwise split it into bytes. */
1928 enum machine_mode omode, imode;
1929 unsigned int subalign;
1930 unsigned int subsize, i;
1932 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
1933 subalign = MIN (align, subsize * BITS_PER_UNIT);
1934 omode = mode_for_size (subsize * BITS_PER_UNIT, MODE_INT, 0);
1935 imode = mode_for_size (size * BITS_PER_UNIT, MODE_INT, 0);
1937 for (i = 0; i < size; i += subsize)
1939 rtx partial = simplify_subreg (omode, x, imode, i);
1940 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
1946 /* If we've printed some of it, but not all of it, there's no going
1959 assemble_real (d, mode, align)
1961 enum machine_mode mode;
1966 unsigned int nalign = min_align (align, 32);
1968 switch (BITS_PER_UNIT)
1974 REAL_VALUE_TO_TARGET_SINGLE (d, l);
1975 assemble_integer (GEN_INT (l), 4, align, 1);
1978 REAL_VALUE_TO_TARGET_DOUBLE (d, data);
1979 assemble_integer (GEN_INT (data[0]), 4, align, 1);
1980 assemble_integer (GEN_INT (data[1]), 4, nalign, 1);
1983 REAL_VALUE_TO_TARGET_LONG_DOUBLE (d, data);
1984 assemble_integer (GEN_INT (data[0]), 4, align, 1);
1985 assemble_integer (GEN_INT (data[1]), 4, nalign, 1);
1986 assemble_integer (GEN_INT (data[2]), 4, nalign, 1);
1989 REAL_VALUE_TO_TARGET_LONG_DOUBLE (d, data);
1990 assemble_integer (GEN_INT (data[0]), 4, align, 1);
1991 assemble_integer (GEN_INT (data[1]), 4, nalign, 1);
1992 assemble_integer (GEN_INT (data[2]), 4, nalign, 1);
1993 assemble_integer (GEN_INT (data[3]), 4, nalign, 1);
2004 REAL_VALUE_TO_TARGET_SINGLE (d, l);
2005 assemble_integer (GEN_INT (l), 2, align, 1);
2008 REAL_VALUE_TO_TARGET_DOUBLE (d, data);
2009 assemble_integer (GEN_INT (data[0]), 2, align, 1);
2010 assemble_integer (GEN_INT (data[1]), 1, nalign, 1);
2021 REAL_VALUE_TO_TARGET_SINGLE (d, l);
2022 assemble_integer (GEN_INT (l), 1, align, 1);
2025 REAL_VALUE_TO_TARGET_DOUBLE (d, data);
2026 assemble_integer (GEN_INT (data[0]), 1, align, 1);
2027 assemble_integer (GEN_INT (data[1]), 1, nalign, 1);
2039 /* Given an expression EXP with a constant value,
2040 reduce it to the sum of an assembler symbol and an integer.
2041 Store them both in the structure *VALUE.
2042 Abort if EXP does not reduce. */
2044 struct addr_const GTY(())
2047 HOST_WIDE_INT offset;
2051 decode_addr_const (exp, value)
2053 struct addr_const *value;
2055 tree target = TREE_OPERAND (exp, 0);
2061 if (TREE_CODE (target) == COMPONENT_REF
2062 && host_integerp (byte_position (TREE_OPERAND (target, 1)), 0))
2065 offset += int_byte_position (TREE_OPERAND (target, 1));
2066 target = TREE_OPERAND (target, 0);
2068 else if (TREE_CODE (target) == ARRAY_REF
2069 || TREE_CODE (target) == ARRAY_RANGE_REF)
2071 offset += (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target)), 1)
2072 * tree_low_cst (TREE_OPERAND (target, 1), 0));
2073 target = TREE_OPERAND (target, 0);
2079 switch (TREE_CODE (target))
2083 x = DECL_RTL (target);
2087 x = gen_rtx_MEM (FUNCTION_MODE,
2088 gen_rtx_LABEL_REF (VOIDmode,
2089 label_rtx (TREE_OPERAND (exp, 0))));
2097 /* This constant should have been output already, but we can't simply
2098 use TREE_CST_RTL since INTEGER_CST doesn't have one. */
2099 x = output_constant_def (target, 1);
2106 if (GET_CODE (x) != MEM)
2111 value->offset = offset;
2114 /* We do RTX_UNSPEC + XINT (blah), so nothing can go after RTX_UNSPEC. */
2115 enum kind { RTX_UNKNOWN, RTX_DOUBLE, RTX_VECTOR, RTX_INT, RTX_UNSPEC };
2116 struct rtx_const GTY(())
2118 ENUM_BITFIELD(kind) kind : 16;
2119 ENUM_BITFIELD(machine_mode) mode : 16;
2120 union rtx_const_un {
2121 REAL_VALUE_TYPE GTY ((tag ("4"))) du;
2122 struct rtx_const_u_addr {
2125 HOST_WIDE_INT offset;
2126 } GTY ((tag ("1"))) addr;
2127 struct rtx_const_u_di {
2130 } GTY ((tag ("0"))) di;
2132 /* The max vector size we have is 16 wide; two variants for
2133 integral and floating point vectors. */
2134 struct rtx_const_int_vec {
2137 } GTY ((tag ("2"))) int_vec[16];
2139 REAL_VALUE_TYPE GTY ((tag ("3"))) fp_vec[8];
2141 } GTY ((desc ("%1.kind >= RTX_INT"), descbits ("1"))) un;
2144 /* Uniquize all constants that appear in memory.
2145 Each constant in memory thus far output is recorded
2146 in `const_hash_table'. */
2148 struct constant_descriptor_tree GTY(())
2150 /* More constant_descriptors with the same hash code. */
2151 struct constant_descriptor_tree *next;
2153 /* The label of the constant. */
2156 /* A MEM for the constant. */
2159 /* The value of the constant. */
2163 #define MAX_HASH_TABLE 1009
2164 static GTY(()) struct constant_descriptor_tree *
2165 const_hash_table[MAX_HASH_TABLE];
2167 /* We maintain a hash table of STRING_CST values. Unless we are asked to force
2168 out a string constant, we defer output of the constants until we know
2169 they are actually used. This will be if something takes its address or if
2170 there is a usage of the string in the RTL of a function. */
2172 #define STRHASH(x) htab_hash_pointer (x)
2174 struct deferred_string GTY(())
2181 static GTY ((param_is (struct deferred_string))) htab_t const_str_htab;
2183 /* Returns a hash code for X (which is a really a
2184 struct deferred_string *). */
2187 const_str_htab_hash (x)
2190 return STRHASH (((const struct deferred_string *) x)->label);
2193 /* Returns nonzero if the value represented by X (which is really a
2194 struct deferred_string *) is the same as that given by Y
2195 (which is really a char *). */
2198 const_str_htab_eq (x, y)
2202 return (((const struct deferred_string *) x)->label == (const char *) y);
2205 /* Compute a hash code for a constant expression. */
2211 return const_hash_1 (exp) % MAX_HASH_TABLE;
2221 enum tree_code code = TREE_CODE (exp);
2223 /* Either set P and LEN to the address and len of something to hash and
2224 exit the switch or return a value. */
2229 p = (char *) &TREE_INT_CST (exp);
2230 len = sizeof TREE_INT_CST (exp);
2234 return real_hash (TREE_REAL_CST_PTR (exp));
2237 p = TREE_STRING_POINTER (exp);
2238 len = TREE_STRING_LENGTH (exp);
2242 return (const_hash_1 (TREE_REALPART (exp)) * 5
2243 + const_hash_1 (TREE_IMAGPART (exp)));
2246 if (TREE_CODE (TREE_TYPE (exp)) == SET_TYPE)
2250 len = int_size_in_bytes (TREE_TYPE (exp));
2251 tmp = (char *) alloca (len);
2252 get_set_constructor_bytes (exp, (unsigned char *) tmp, len);
2260 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2262 for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link))
2263 if (TREE_VALUE (link))
2264 hi = hi * 603 + const_hash_1 (TREE_VALUE (link));
2272 struct addr_const value;
2274 decode_addr_const (exp, &value);
2275 if (GET_CODE (value.base) == SYMBOL_REF)
2277 /* Don't hash the address of the SYMBOL_REF;
2278 only use the offset and the symbol name. */
2280 p = XSTR (value.base, 0);
2281 for (i = 0; p[i] != 0; i++)
2282 hi = ((hi * 613) + (unsigned) (p[i]));
2284 else if (GET_CODE (value.base) == LABEL_REF)
2285 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2293 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2294 + const_hash_1 (TREE_OPERAND (exp, 1)));
2298 case NON_LVALUE_EXPR:
2299 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2302 /* A language specific constant. Just hash the code. */
2306 /* Compute hashing function */
2308 for (i = 0; i < len; i++)
2309 hi = ((hi * 613) + (unsigned) (p[i]));
2314 /* Compare t1 and t2, and return 1 only if they are known to result in
2315 the same bit pattern on output. */
2318 compare_constant (t1, t2)
2322 enum tree_code typecode;
2324 if (t1 == NULL_TREE)
2325 return t2 == NULL_TREE;
2326 if (t2 == NULL_TREE)
2329 if (TREE_CODE (t1) != TREE_CODE (t2))
2332 switch (TREE_CODE (t1))
2335 /* Integer constants are the same only if the same width of type. */
2336 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2338 return tree_int_cst_equal (t1, t2);
2341 /* Real constants are the same only if the same width of type. */
2342 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
2345 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
2348 if (flag_writable_strings)
2351 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
2354 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
2355 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
2356 TREE_STRING_LENGTH (t1)));
2359 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
2360 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
2363 typecode = TREE_CODE (TREE_TYPE (t1));
2364 if (typecode != TREE_CODE (TREE_TYPE (t2)))
2367 if (typecode == SET_TYPE)
2369 int len = int_size_in_bytes (TREE_TYPE (t2));
2370 unsigned char *tmp1, *tmp2;
2372 if (int_size_in_bytes (TREE_TYPE (t1)) != len)
2375 tmp1 = (unsigned char *) alloca (len);
2376 tmp2 = (unsigned char *) alloca (len);
2378 if (get_set_constructor_bytes (t1, tmp1, len) != NULL_TREE)
2380 if (get_set_constructor_bytes (t2, tmp2, len) != NULL_TREE)
2383 return memcmp (tmp1, tmp2, len) != 0;
2389 if (typecode == ARRAY_TYPE)
2391 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
2392 /* For arrays, check that the sizes all match. */
2393 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
2395 || size_1 != int_size_in_bytes (TREE_TYPE (t2)))
2400 /* For record and union constructors, require exact type
2402 if (TREE_TYPE (t1) != TREE_TYPE (t2))
2406 for (l1 = CONSTRUCTOR_ELTS (t1), l2 = CONSTRUCTOR_ELTS (t2);
2408 l1 = TREE_CHAIN (l1), l2 = TREE_CHAIN (l2))
2410 /* Check that each value is the same... */
2411 if (! compare_constant (TREE_VALUE (l1), TREE_VALUE (l2)))
2413 /* ... and that they apply to the same fields! */
2414 if (typecode == ARRAY_TYPE)
2416 if (! compare_constant (TREE_PURPOSE (l1),
2422 if (TREE_PURPOSE (l1) != TREE_PURPOSE (l2))
2427 return l1 == NULL_TREE && l2 == NULL_TREE;
2433 struct addr_const value1, value2;
2435 decode_addr_const (t1, &value1);
2436 decode_addr_const (t2, &value2);
2437 return (value1.offset == value2.offset
2438 && strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
2444 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
2445 && compare_constant(TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
2449 case NON_LVALUE_EXPR:
2450 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
2455 nt1 = (*lang_hooks.expand_constant) (t1);
2456 nt2 = (*lang_hooks.expand_constant) (t2);
2457 if (nt1 != t1 || nt2 != t2)
2458 return compare_constant (nt1, nt2);
2464 /* Should not get here. */
2468 /* Make a copy of the whole tree structure for a constant. This
2469 handles the same types of nodes that compare_constant handles. */
2475 switch (TREE_CODE (exp))
2478 /* For ADDR_EXPR, we do not want to copy the decl whose address
2479 is requested. We do want to copy constants though. */
2480 if (TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, 0))) == 'c')
2481 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2482 copy_constant (TREE_OPERAND (exp, 0)));
2484 return copy_node (exp);
2489 return copy_node (exp);
2492 return build_complex (TREE_TYPE (exp),
2493 copy_constant (TREE_REALPART (exp)),
2494 copy_constant (TREE_IMAGPART (exp)));
2498 return build (TREE_CODE (exp), TREE_TYPE (exp),
2499 copy_constant (TREE_OPERAND (exp, 0)),
2500 copy_constant (TREE_OPERAND (exp, 1)));
2504 case NON_LVALUE_EXPR:
2505 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2506 copy_constant (TREE_OPERAND (exp, 0)));
2510 tree copy = copy_node (exp);
2511 tree list = copy_list (CONSTRUCTOR_ELTS (exp));
2514 CONSTRUCTOR_ELTS (copy) = list;
2515 for (tail = list; tail; tail = TREE_CHAIN (tail))
2516 TREE_VALUE (tail) = copy_constant (TREE_VALUE (tail));
2517 if (TREE_CODE (TREE_TYPE (exp)) == SET_TYPE)
2518 for (tail = list; tail; tail = TREE_CHAIN (tail))
2519 TREE_PURPOSE (tail) = copy_constant (TREE_PURPOSE (tail));
2527 t = (*lang_hooks.expand_constant) (exp);
2529 return copy_constant (t);
2536 /* Return an rtx representing a reference to constant data in memory
2537 for the constant expression EXP.
2539 If assembler code for such a constant has already been output,
2540 return an rtx to refer to it.
2541 Otherwise, output such a constant in memory
2542 and generate an rtx for it.
2544 If DEFER is nonzero, the output of string constants can be deferred
2545 and output only if referenced in the function after all optimizations.
2547 The TREE_CST_RTL of EXP is set up to point to that rtx.
2548 The const_hash_table records which constants already have label strings. */
2551 output_constant_def (exp, defer)
2556 struct constant_descriptor_tree *desc;
2557 struct deferred_string **defstr;
2564 /* We can't just use the saved RTL if this is a deferred string constant
2565 and we are not to defer anymore. */
2566 if (TREE_CODE (exp) != INTEGER_CST && TREE_CST_RTL (exp)
2567 && (defer || !STRING_POOL_ADDRESS_P (XEXP (TREE_CST_RTL (exp), 0))))
2568 return TREE_CST_RTL (exp);
2570 /* Make sure any other constants whose addresses appear in EXP
2571 are assigned label numbers. */
2573 reloc = output_addressed_constants (exp);
2575 /* Compute hash code of EXP. Search the descriptors for that hash code
2576 to see if any of them describes EXP. If yes, the descriptor records
2577 the label number already assigned. */
2579 hash = const_hash (exp);
2581 for (desc = const_hash_table[hash]; desc; desc = desc->next)
2582 if (compare_constant (exp, desc->value))
2589 /* No constant equal to EXP is known to have been output.
2590 Make a constant descriptor to enter EXP in the hash table.
2591 Assign the label number and record it in the descriptor for
2592 future calls to this function to find. */
2594 /* Create a string containing the label name, in LABEL. */
2595 labelno = const_labelno++;
2596 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
2598 desc = ggc_alloc (sizeof (*desc));
2599 desc->next = const_hash_table[hash];
2600 desc->label = ggc_strdup (label);
2601 desc->value = copy_constant (exp);
2602 const_hash_table[hash] = desc;
2604 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
2605 symbol = gen_rtx_SYMBOL_REF (Pmode, desc->label);
2606 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2608 rtl = desc->rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
2610 set_mem_attributes (rtl, exp, 1);
2611 set_mem_alias_set (rtl, 0);
2612 set_mem_alias_set (rtl, const_alias_set);
2619 if (TREE_CODE (exp) != INTEGER_CST)
2620 TREE_CST_RTL (exp) = rtl;
2622 /* Optionally set flags or add text to the name to record information
2623 such as that it is a function name. If the name is changed, the macro
2624 ASM_OUTPUT_LABELREF will have to know how to strip this information. */
2625 /* A previously-processed constant would already have section info
2629 (*targetm.encode_section_info) (exp, rtl, true);
2632 desc->label = XSTR (XEXP (desc->rtl, 0), 0);
2635 if (found && !defer && STRING_POOL_ADDRESS_P (XEXP (rtl, 0)))
2637 defstr = (struct deferred_string **)
2638 htab_find_slot_with_hash (const_str_htab, desc->label,
2639 STRHASH (desc->label), NO_INSERT);
2642 /* If the string is currently deferred but we need to output it now,
2643 remove it from deferred string hash table. */
2645 labelno = (*defstr)->labelno;
2646 STRING_POOL_ADDRESS_P (XEXP (rtl, 0)) = 0;
2647 htab_clear_slot (const_str_htab, (void **) defstr);
2651 /* If this is the first time we've seen this particular constant,
2652 output it. Do no output if -fsyntax-only. */
2653 if (! found && ! flag_syntax_only)
2655 if (!defer || TREE_CODE (exp) != STRING_CST
2656 || flag_writable_strings)
2657 output_constant_def_contents (exp, reloc, labelno);
2660 defstr = (struct deferred_string **)
2661 htab_find_slot_with_hash (const_str_htab, desc->label,
2662 STRHASH (desc->label), INSERT);
2664 output_constant_def_contents (exp, reloc, labelno);
2667 struct deferred_string *p;
2669 p = (struct deferred_string *)
2670 ggc_alloc (sizeof (struct deferred_string));
2672 p->exp = desc->value;
2673 p->label = desc->label;
2674 p->labelno = labelno;
2676 STRING_POOL_ADDRESS_P (XEXP (rtl, 0)) = 1;
2684 /* Now output assembler code to define the label for EXP,
2685 and follow it with the data of EXP. */
2688 output_constant_def_contents (exp, reloc, labelno)
2695 /* Align the location counter as required by EXP's data type. */
2696 align = TYPE_ALIGN (TREE_TYPE (exp));
2697 #ifdef CONSTANT_ALIGNMENT
2698 align = CONSTANT_ALIGNMENT (exp, align);
2701 if (IN_NAMED_SECTION (exp))
2702 named_section (exp, NULL, reloc);
2704 (*targetm.asm_out.select_section) (exp, reloc, align);
2706 if (align > BITS_PER_UNIT)
2708 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
2711 /* Output the label itself. */
2712 (*targetm.asm_out.internal_label) (asm_out_file, "LC", labelno);
2714 /* Output the value of EXP. */
2715 output_constant (exp,
2716 (TREE_CODE (exp) == STRING_CST
2717 ? MAX (TREE_STRING_LENGTH (exp),
2718 int_size_in_bytes (TREE_TYPE (exp)))
2719 : int_size_in_bytes (TREE_TYPE (exp))),
2724 /* Used in the hash tables to avoid outputting the same constant
2725 twice. Unlike 'struct constant_descriptor_tree', RTX constants
2726 are output once per function, not once per file; there seems
2727 to be no reason for the difference. */
2729 struct constant_descriptor_rtx GTY(())
2731 /* More constant_descriptors with the same hash code. */
2732 struct constant_descriptor_rtx *next;
2734 /* A MEM for the constant. */
2737 /* The value of the constant. */
2738 struct rtx_const value;
2741 /* Structure to represent sufficient information about a constant so that
2742 it can be output when the constant pool is output, so that function
2743 integration can be done, and to simplify handling on machines that reference
2744 constant pool as base+displacement. */
2746 struct pool_constant GTY(())
2748 struct constant_descriptor_rtx *desc;
2749 struct pool_constant *next;
2750 struct pool_constant *next_sym;
2752 enum machine_mode mode;
2755 HOST_WIDE_INT offset;
2759 /* Hash code for a SYMBOL_REF with CONSTANT_POOL_ADDRESS_P true.
2760 The argument is XSTR (... , 0) */
2762 #define SYMHASH(LABEL) (((unsigned long) (LABEL)) % MAX_RTX_HASH_TABLE)
2764 /* Initialize constant pool hashing for a new function. */
2767 init_varasm_status (f)
2770 struct varasm_status *p;
2771 p = (struct varasm_status *) ggc_alloc (sizeof (struct varasm_status));
2773 p->x_const_rtx_hash_table
2774 = ((struct constant_descriptor_rtx **)
2775 ggc_alloc_cleared (MAX_RTX_HASH_TABLE
2776 * sizeof (struct constant_descriptor_rtx *)));
2777 p->x_const_rtx_sym_hash_table
2778 = ((struct pool_constant **)
2779 ggc_alloc_cleared (MAX_RTX_HASH_TABLE
2780 * sizeof (struct pool_constant *)));
2782 p->x_first_pool = p->x_last_pool = 0;
2783 p->x_pool_offset = 0;
2787 /* Express an rtx for a constant integer (perhaps symbolic)
2788 as the sum of a symbol or label plus an explicit integer.
2789 They are stored into VALUE. */
2792 decode_rtx_const (mode, x, value)
2793 enum machine_mode mode;
2795 struct rtx_const *value;
2797 /* Clear the whole structure, including any gaps. */
2798 memset (value, 0, sizeof (struct rtx_const));
2800 value->kind = RTX_INT; /* Most usual kind. */
2803 switch (GET_CODE (x))
2806 value->kind = RTX_DOUBLE;
2807 if (GET_MODE (x) != VOIDmode)
2809 const REAL_VALUE_TYPE *r = CONST_DOUBLE_REAL_VALUE (x);
2811 value->mode = GET_MODE (x);
2813 /* Copy the REAL_VALUE_TYPE by members so that we don't
2814 copy garbage from the original structure into our
2815 carefully cleaned hashing structure. */
2816 value->un.du.class = r->class;
2817 value->un.du.sign = r->sign;
2824 value->un.du.exp = r->exp;
2827 memcpy (value->un.du.sig, r->sig, sizeof (r->sig));
2835 value->un.di.low = CONST_DOUBLE_LOW (x);
2836 value->un.di.high = CONST_DOUBLE_HIGH (x);
2844 units = CONST_VECTOR_NUNITS (x);
2845 value->kind = RTX_VECTOR;
2848 if (GET_MODE_CLASS (mode) == MODE_VECTOR_INT)
2850 for (i = 0; i < units; ++i)
2852 rtx elt = CONST_VECTOR_ELT (x, i);
2853 if (GET_CODE (elt) == CONST_INT)
2855 value->un.int_vec[i].low = INTVAL (elt);
2856 value->un.int_vec[i].high = 0;
2860 value->un.int_vec[i].low = CONST_DOUBLE_LOW (elt);
2861 value->un.int_vec[i].high = CONST_DOUBLE_HIGH (elt);
2865 else if (GET_MODE_CLASS (mode) == MODE_VECTOR_FLOAT)
2867 for (i = 0; i < units; ++i)
2869 const REAL_VALUE_TYPE *r
2870 = CONST_DOUBLE_REAL_VALUE (CONST_VECTOR_ELT (x, i));
2871 REAL_VALUE_TYPE *d = &value->un.fp_vec[i];
2873 /* Copy the REAL_VALUE_TYPE by members so that we don't
2874 copy garbage from the original structure into our
2875 carefully cleaned hashing structure. */
2876 d->class = r->class;
2887 memcpy (d->sig, r->sig, sizeof (r->sig));
2900 value->un.addr.offset = INTVAL (x);
2906 value->un.addr.base = x;
2911 if (GET_CODE (x) == PLUS && GET_CODE (XEXP (x, 1)) == CONST_INT)
2913 value->un.addr.base = XEXP (x, 0);
2914 value->un.addr.offset = INTVAL (XEXP (x, 1));
2916 else if (GET_CODE (x) == MINUS && GET_CODE (XEXP (x, 1)) == CONST_INT)
2918 value->un.addr.base = XEXP (x, 0);
2919 value->un.addr.offset = - INTVAL (XEXP (x, 1));
2923 value->un.addr.base = x;
2924 value->un.addr.offset = 0;
2929 value->kind = RTX_UNKNOWN;
2933 if (value->kind == RTX_INT && value->un.addr.base != 0
2934 && GET_CODE (value->un.addr.base) == UNSPEC)
2936 /* For a simple UNSPEC, the base is set to the
2937 operand, the kind field is set to the index of
2938 the unspec expression.
2939 Together with the code below, in case that
2940 the operand is a SYMBOL_REF or LABEL_REF,
2941 the address of the string or the code_label
2942 is taken as base. */
2943 if (XVECLEN (value->un.addr.base, 0) == 1)
2945 value->kind = RTX_UNSPEC + XINT (value->un.addr.base, 1);
2946 value->un.addr.base = XVECEXP (value->un.addr.base, 0, 0);
2950 if (value->kind >= RTX_INT && value->un.addr.base != 0)
2951 switch (GET_CODE (value->un.addr.base))
2954 /* Use the string's address, not the SYMBOL_REF's address,
2955 for the sake of addresses of library routines. */
2956 value->un.addr.symbol = XSTR (value->un.addr.base, 0);
2957 value->un.addr.base = NULL_RTX;
2961 /* For a LABEL_REF, compare labels. */
2962 value->un.addr.base = XEXP (value->un.addr.base, 0);
2969 /* Given a MINUS expression, simplify it if both sides
2970 include the same symbol. */
2973 simplify_subtraction (x)
2976 struct rtx_const val0, val1;
2978 decode_rtx_const (GET_MODE (x), XEXP (x, 0), &val0);
2979 decode_rtx_const (GET_MODE (x), XEXP (x, 1), &val1);
2981 if (val0.kind >= RTX_INT
2982 && val0.kind == val1.kind
2983 && val0.un.addr.base == val1.un.addr.base
2984 && val0.un.addr.symbol == val1.un.addr.symbol)
2985 return GEN_INT (val0.un.addr.offset - val1.un.addr.offset);
2990 /* Compute a hash code for a constant RTL expression. */
2993 const_hash_rtx (mode, x)
2994 enum machine_mode mode;
2998 struct rtx_const value;
2999 unsigned int data[sizeof(struct rtx_const) / sizeof (unsigned int)];
3005 decode_rtx_const (mode, x, &u.value);
3007 /* Compute hashing function */
3009 for (i = 0; i < ARRAY_SIZE (u.data); i++)
3010 hi = hi * 613 + u.data[i];
3012 return hi % MAX_RTX_HASH_TABLE;
3015 /* Compare a constant rtl object X with a constant-descriptor DESC.
3016 Return 1 if DESC describes a constant with the same value as X. */
3019 compare_constant_rtx (mode, x, desc)
3020 enum machine_mode mode;
3022 struct constant_descriptor_rtx *desc;
3024 struct rtx_const value;
3026 decode_rtx_const (mode, x, &value);
3028 /* Compare constant contents. */
3029 return memcmp (&value, &desc->value, sizeof (struct rtx_const)) == 0;
3032 /* Construct a constant descriptor for the rtl-expression X.
3033 It is up to the caller to enter the descriptor in the hash table. */
3035 static struct constant_descriptor_rtx *
3036 record_constant_rtx (mode, x)
3037 enum machine_mode mode;
3040 struct constant_descriptor_rtx *ptr;
3042 ptr = (struct constant_descriptor_rtx *) ggc_alloc (sizeof (*ptr));
3043 decode_rtx_const (mode, x, &ptr->value);
3048 /* Given a constant rtx X, return a MEM for the location in memory at which
3049 this constant has been placed. Return 0 if it not has been placed yet. */
3052 mem_for_const_double (x)
3055 enum machine_mode mode = GET_MODE (x);
3056 struct constant_descriptor_rtx *desc;
3058 for (desc = const_rtx_hash_table[const_hash_rtx (mode, x)]; desc;
3060 if (compare_constant_rtx (mode, x, desc))
3066 /* Given a constant rtx X, make (or find) a memory constant for its value
3067 and return a MEM rtx to refer to it in memory. */
3070 force_const_mem (mode, x)
3071 enum machine_mode mode;
3075 struct constant_descriptor_rtx *desc;
3078 struct pool_constant *pool;
3081 /* If we're not allowed to drop X into the constant pool, don't. */
3082 if ((*targetm.cannot_force_const_mem) (x))
3085 /* Compute hash code of X. Search the descriptors for that hash code
3086 to see if any of them describes X. If yes, we have an rtx to use. */
3087 hash = const_hash_rtx (mode, x);
3088 for (desc = const_rtx_hash_table[hash]; desc; desc = desc->next)
3089 if (compare_constant_rtx (mode, x, desc))
3092 /* No constant equal to X is known to have been output.
3093 Make a constant descriptor to enter X in the hash table
3094 and make a MEM for it. */
3095 desc = record_constant_rtx (mode, x);
3096 desc->next = const_rtx_hash_table[hash];
3097 const_rtx_hash_table[hash] = desc;
3099 /* Align the location counter as required by EXP's data type. */
3100 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3101 #ifdef CONSTANT_ALIGNMENT
3102 align = CONSTANT_ALIGNMENT (make_tree ((*lang_hooks.types.type_for_mode)
3103 (mode, 0), x), align);
3106 pool_offset += (align / BITS_PER_UNIT) - 1;
3107 pool_offset &= ~ ((align / BITS_PER_UNIT) - 1);
3109 if (GET_CODE (x) == LABEL_REF)
3110 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3112 /* Allocate a pool constant descriptor, fill it in, and chain it in. */
3113 pool = (struct pool_constant *) ggc_alloc (sizeof (struct pool_constant));
3117 pool->labelno = const_labelno;
3118 pool->align = align;
3119 pool->offset = pool_offset;
3126 last_pool->next = pool;
3129 pool_offset += GET_MODE_SIZE (mode);
3131 /* Create a string containing the label name, in LABEL. */
3132 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3136 /* Construct the SYMBOL_REF and the MEM. */
3138 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3139 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
3141 pool->desc->rtl = def = gen_rtx_MEM (mode, symbol);
3142 set_mem_attributes (def, (*lang_hooks.types.type_for_mode) (mode, 0), 1);
3143 RTX_UNCHANGING_P (def) = 1;
3145 /* Add label to symbol hash table. */
3146 hash = SYMHASH (XSTR (symbol, 0));
3147 pool->next_sym = const_rtx_sym_hash_table[hash];
3148 const_rtx_sym_hash_table[hash] = pool;
3150 /* Mark the symbol_ref as belonging to this constants pool. */
3151 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3152 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
3153 current_function_uses_const_pool = 1;
3158 /* Given a SYMBOL_REF with CONSTANT_POOL_ADDRESS_P true, return a pointer to
3159 the corresponding pool_constant structure. */
3161 static struct pool_constant *
3162 find_pool_constant (f, addr)
3166 struct pool_constant *pool;
3167 const char *label = XSTR (addr, 0);
3169 for (pool = f->varasm->x_const_rtx_sym_hash_table[SYMHASH (label)]; pool;
3170 pool = pool->next_sym)
3171 if (XSTR (XEXP (pool->desc->rtl, 0), 0) == label)
3177 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3180 get_pool_constant (addr)
3183 return (find_pool_constant (cfun, addr))->constant;
3186 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3187 and whether it has been output or not. */
3190 get_pool_constant_mark (addr, pmarked)
3194 struct pool_constant *pool = find_pool_constant (cfun, addr);
3195 *pmarked = (pool->mark != 0);
3196 return pool->constant;
3199 /* Likewise, but for the constant pool of a specific function. */
3202 get_pool_constant_for_function (f, addr)
3206 return (find_pool_constant (f, addr))->constant;
3209 /* Similar, return the mode. */
3212 get_pool_mode (addr)
3215 return (find_pool_constant (cfun, addr))->mode;
3219 get_pool_mode_for_function (f, addr)
3223 return (find_pool_constant (f, addr))->mode;
3226 /* Similar, return the offset in the constant pool. */
3229 get_pool_offset (addr)
3232 return (find_pool_constant (cfun, addr))->offset;
3235 /* Return the size of the constant pool. */
3243 /* Write all the constants in the constant pool. */
3246 output_constant_pool (fnname, fndecl)
3247 const char *fnname ATTRIBUTE_UNUSED;
3248 tree fndecl ATTRIBUTE_UNUSED;
3250 struct pool_constant *pool;
3254 /* It is possible for gcc to call force_const_mem and then to later
3255 discard the instructions which refer to the constant. In such a
3256 case we do not need to output the constant. */
3257 mark_constant_pool ();
3259 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3260 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool_offset);
3263 for (pool = first_pool; pool; pool = pool->next)
3272 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3273 whose CODE_LABEL has been deleted. This can occur if a jump table
3274 is eliminated by optimization. If so, write a constant of zero
3275 instead. Note that this can also happen by turning the
3276 CODE_LABEL into a NOTE. */
3277 /* ??? This seems completely and utterly wrong. Certainly it's
3278 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3279 functioning even with INSN_DELETED_P and friends. */
3282 switch (GET_CODE (x))
3285 if (GET_CODE (XEXP (x, 0)) != PLUS
3286 || GET_CODE (XEXP (XEXP (x, 0), 0)) != LABEL_REF)
3288 tmp = XEXP (XEXP (x, 0), 0);
3293 if (INSN_DELETED_P (tmp)
3294 || (GET_CODE (tmp) == NOTE
3295 && NOTE_LINE_NUMBER (tmp) == NOTE_INSN_DELETED))
3306 /* First switch to correct section. */
3307 (*targetm.asm_out.select_rtx_section) (pool->mode, x, pool->align);
3309 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3310 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, pool->mode,
3311 pool->align, pool->labelno, done);
3314 assemble_align (pool->align);
3316 /* Output the label. */
3317 (*targetm.asm_out.internal_label) (asm_out_file, "LC", pool->labelno);
3319 /* Output the value of the constant itself. */
3320 switch (GET_MODE_CLASS (pool->mode))
3323 if (GET_CODE (x) != CONST_DOUBLE)
3326 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
3327 assemble_real (r, pool->mode, pool->align);
3331 case MODE_PARTIAL_INT:
3332 assemble_integer (x, GET_MODE_SIZE (pool->mode), pool->align, 1);
3335 case MODE_VECTOR_FLOAT:
3340 if (GET_CODE (x) != CONST_VECTOR)
3343 units = CONST_VECTOR_NUNITS (x);
3345 for (i = 0; i < units; i++)
3347 elt = CONST_VECTOR_ELT (x, i);
3348 REAL_VALUE_FROM_CONST_DOUBLE (r, elt);
3349 assemble_real (r, GET_MODE_INNER (pool->mode), pool->align);
3354 case MODE_VECTOR_INT:
3359 if (GET_CODE (x) != CONST_VECTOR)
3362 units = CONST_VECTOR_NUNITS (x);
3364 for (i = 0; i < units; i++)
3366 elt = CONST_VECTOR_ELT (x, i);
3367 assemble_integer (elt, GET_MODE_UNIT_SIZE (pool->mode),
3377 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3378 sections have proper size. */
3379 if (pool->align > GET_MODE_BITSIZE (pool->mode)
3380 && in_section == in_named
3381 && get_named_section_flags (in_named_name) & SECTION_MERGE)
3382 assemble_align (pool->align);
3384 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3389 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3390 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool_offset);
3393 /* Done with this pool. */
3394 first_pool = last_pool = 0;
3397 /* Look through the instructions for this function, and mark all the
3398 entries in the constant pool which are actually being used.
3399 Emit used deferred strings. */
3402 mark_constant_pool ()
3406 struct pool_constant *pool;
3408 if (first_pool == 0 && htab_elements (const_str_htab) == 0)
3411 for (pool = first_pool; pool; pool = pool->next)
3414 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
3416 mark_constants (PATTERN (insn));
3418 for (link = current_function_epilogue_delay_list;
3420 link = XEXP (link, 1))
3422 insn = XEXP (link, 0);
3425 mark_constants (PATTERN (insn));
3429 /* Look through appropriate parts of X, marking all entries in the
3430 constant pool which are actually being used. Entries that are only
3431 referenced by other constants are also marked as used. Emit
3432 deferred strings that are used. */
3439 const char *format_ptr;
3444 if (GET_CODE (x) == SYMBOL_REF)
3446 mark_constant (&x, NULL);
3450 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3451 insns, not any notes that may be attached. We don't want to mark
3452 a constant just because it happens to appear in a REG_EQUIV note. */
3455 mark_constants (PATTERN (x));
3459 format_ptr = GET_RTX_FORMAT (GET_CODE (x));
3461 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (x)); i++)
3463 switch (*format_ptr++)
3466 mark_constants (XEXP (x, i));
3470 if (XVEC (x, i) != 0)
3474 for (j = 0; j < XVECLEN (x, i); j++)
3475 mark_constants (XVECEXP (x, i, j));
3495 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3496 to as used. Emit referenced deferred strings. This function can
3497 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3500 mark_constant (current_rtx, data)
3502 void *data ATTRIBUTE_UNUSED;
3504 rtx x = *current_rtx;
3509 else if (GET_CODE (x) == SYMBOL_REF)
3511 if (CONSTANT_POOL_ADDRESS_P (x))
3513 struct pool_constant *pool = find_pool_constant (cfun, x);
3514 if (pool->mark == 0)
3517 for_each_rtx (&(pool->constant), &mark_constant, NULL);
3522 else if (STRING_POOL_ADDRESS_P (x))
3524 struct deferred_string **defstr;
3526 defstr = (struct deferred_string **)
3527 htab_find_slot_with_hash (const_str_htab, XSTR (x, 0),
3528 STRHASH (XSTR (x, 0)), NO_INSERT);
3531 struct deferred_string *p = *defstr;
3533 STRING_POOL_ADDRESS_P (x) = 0;
3534 output_constant_def_contents (p->exp, 0, p->labelno);
3535 htab_clear_slot (const_str_htab, (void **) defstr);
3542 /* Find all the constants whose addresses are referenced inside of EXP,
3543 and make sure assembler code with a label has been output for each one.
3544 Indicate whether an ADDR_EXPR has been encountered. */
3547 output_addressed_constants (exp)
3550 int reloc = 0, reloc2;
3553 /* Give the front-end a chance to convert VALUE to something that
3554 looks more like a constant to the back-end. */
3555 exp = (*lang_hooks.expand_constant) (exp);
3557 switch (TREE_CODE (exp))
3561 /* Go inside any operations that get_inner_reference can handle and see
3562 if what's inside is a constant: no need to do anything here for
3563 addresses of variables or functions. */
3564 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
3565 tem = TREE_OPERAND (tem, 0))
3568 if (TREE_CODE_CLASS (TREE_CODE (tem)) == 'c'
3569 || TREE_CODE (tem) == CONSTRUCTOR)
3570 output_constant_def (tem, 0);
3572 if (TREE_PUBLIC (tem))
3579 reloc = output_addressed_constants (TREE_OPERAND (exp, 0));
3580 reloc |= output_addressed_constants (TREE_OPERAND (exp, 1));
3584 reloc = output_addressed_constants (TREE_OPERAND (exp, 0));
3585 reloc2 = output_addressed_constants (TREE_OPERAND (exp, 1));
3586 /* The difference of two local labels is computable at link time. */
3587 if (reloc == 1 && reloc2 == 1)
3595 case NON_LVALUE_EXPR:
3596 reloc = output_addressed_constants (TREE_OPERAND (exp, 0));
3600 for (tem = CONSTRUCTOR_ELTS (exp); tem; tem = TREE_CHAIN (tem))
3601 if (TREE_VALUE (tem) != 0)
3602 reloc |= output_addressed_constants (TREE_VALUE (tem));
3612 /* Return nonzero if VALUE is a valid constant-valued expression
3613 for use in initializing a static variable; one that can be an
3614 element of a "constant" initializer.
3616 Return null_pointer_node if the value is absolute;
3617 if it is relocatable, return the variable that determines the relocation.
3618 We assume that VALUE has been folded as much as possible;
3619 therefore, we do not need to check for such things as
3620 arithmetic-combinations of integers. */
3623 initializer_constant_valid_p (value, endtype)
3627 /* Give the front-end a chance to convert VALUE to something that
3628 looks more like a constant to the back-end. */
3629 value = (*lang_hooks.expand_constant) (value);
3631 switch (TREE_CODE (value))
3634 if ((TREE_CODE (TREE_TYPE (value)) == UNION_TYPE
3635 || TREE_CODE (TREE_TYPE (value)) == RECORD_TYPE)
3636 && TREE_CONSTANT (value)
3637 && CONSTRUCTOR_ELTS (value))
3639 initializer_constant_valid_p (TREE_VALUE (CONSTRUCTOR_ELTS (value)),
3642 return TREE_STATIC (value) ? null_pointer_node : 0;
3649 return null_pointer_node;
3653 return staticp (TREE_OPERAND (value, 0)) ? TREE_OPERAND (value, 0) : 0;
3655 case VIEW_CONVERT_EXPR:
3656 case NON_LVALUE_EXPR:
3657 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
3661 /* Allow conversions between pointer types. */
3662 if (POINTER_TYPE_P (TREE_TYPE (value))
3663 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (value, 0))))
3664 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
3666 /* Allow conversions between real types. */
3667 if (FLOAT_TYPE_P (TREE_TYPE (value))
3668 && FLOAT_TYPE_P (TREE_TYPE (TREE_OPERAND (value, 0))))
3669 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
3671 /* Allow length-preserving conversions between integer types. */
3672 if (INTEGRAL_TYPE_P (TREE_TYPE (value))
3673 && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (value, 0)))
3674 && (TYPE_PRECISION (TREE_TYPE (value))
3675 == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0)))))
3676 return initializer_constant_valid_p (TREE_OPERAND (value, 0), endtype);
3678 /* Allow conversions between other integer types only if
3680 if (INTEGRAL_TYPE_P (TREE_TYPE (value))
3681 && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (value, 0))))
3683 tree inner = initializer_constant_valid_p (TREE_OPERAND (value, 0),
3685 if (inner == null_pointer_node)
3686 return null_pointer_node;
3690 /* Allow (int) &foo provided int is as wide as a pointer. */
3691 if (INTEGRAL_TYPE_P (TREE_TYPE (value))
3692 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (value, 0)))
3693 && (TYPE_PRECISION (TREE_TYPE (value))
3694 >= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0)))))
3695 return initializer_constant_valid_p (TREE_OPERAND (value, 0),
3698 /* Likewise conversions from int to pointers, but also allow
3699 conversions from 0. */
3700 if (POINTER_TYPE_P (TREE_TYPE (value))
3701 && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (value, 0))))
3703 if (integer_zerop (TREE_OPERAND (value, 0)))
3704 return null_pointer_node;
3705 else if (TYPE_PRECISION (TREE_TYPE (value))
3706 <= TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (value, 0))))
3707 return initializer_constant_valid_p (TREE_OPERAND (value, 0),
3711 /* Allow conversions to union types if the value inside is okay. */
3712 if (TREE_CODE (TREE_TYPE (value)) == UNION_TYPE)
3713 return initializer_constant_valid_p (TREE_OPERAND (value, 0),
3718 if (! INTEGRAL_TYPE_P (endtype)
3719 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
3721 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
3723 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
3725 /* If either term is absolute, use the other terms relocation. */
3726 if (valid0 == null_pointer_node)
3728 if (valid1 == null_pointer_node)
3734 if (! INTEGRAL_TYPE_P (endtype)
3735 || TYPE_PRECISION (endtype) >= POINTER_SIZE)
3737 tree valid0 = initializer_constant_valid_p (TREE_OPERAND (value, 0),
3739 tree valid1 = initializer_constant_valid_p (TREE_OPERAND (value, 1),
3741 /* Win if second argument is absolute. */
3742 if (valid1 == null_pointer_node)
3744 /* Win if both arguments have the same relocation.
3745 Then the value is absolute. */
3746 if (valid0 == valid1 && valid0 != 0)
3747 return null_pointer_node;
3749 /* Since GCC guarantees that string constants are unique in the
3750 generated code, a subtraction between two copies of the same
3751 constant string is absolute. */
3752 if (valid0 && TREE_CODE (valid0) == STRING_CST &&
3753 valid1 && TREE_CODE (valid1) == STRING_CST &&
3754 TREE_STRING_POINTER (valid0) == TREE_STRING_POINTER (valid1))
3755 return null_pointer_node;
3758 /* Support differences between labels. */
3759 if (INTEGRAL_TYPE_P (endtype))
3762 op0 = TREE_OPERAND (value, 0);
3763 op1 = TREE_OPERAND (value, 1);
3765 /* Like STRIP_NOPS except allow the operand mode to widen.
3766 This works around a feature of fold that simplifies
3767 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
3768 that the narrower operation is cheaper. */
3770 while (TREE_CODE (op0) == NOP_EXPR
3771 || TREE_CODE (op0) == CONVERT_EXPR
3772 || TREE_CODE (op0) == NON_LVALUE_EXPR)
3774 tree inner = TREE_OPERAND (op0, 0);
3775 if (inner == error_mark_node
3776 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
3777 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
3778 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
3783 while (TREE_CODE (op1) == NOP_EXPR
3784 || TREE_CODE (op1) == CONVERT_EXPR
3785 || TREE_CODE (op1) == NON_LVALUE_EXPR)
3787 tree inner = TREE_OPERAND (op1, 0);
3788 if (inner == error_mark_node
3789 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
3790 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
3791 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
3796 if (TREE_CODE (op0) == ADDR_EXPR
3797 && TREE_CODE (TREE_OPERAND (op0, 0)) == LABEL_DECL
3798 && TREE_CODE (op1) == ADDR_EXPR
3799 && TREE_CODE (TREE_OPERAND (op1, 0)) == LABEL_DECL)
3800 return null_pointer_node;
3811 /* Output assembler code for constant EXP to FILE, with no label.
3812 This includes the pseudo-op such as ".int" or ".byte", and a newline.
3813 Assumes output_addressed_constants has been done on EXP already.
3815 Generate exactly SIZE bytes of assembler data, padding at the end
3816 with zeros if necessary. SIZE must always be specified.
3818 SIZE is important for structure constructors,
3819 since trailing members may have been omitted from the constructor.
3820 It is also important for initialization of arrays from string constants
3821 since the full length of the string constant might not be wanted.
3822 It is also needed for initialization of unions, where the initializer's
3823 type is just one member, and that may not be as long as the union.
3825 There a case in which we would fail to output exactly SIZE bytes:
3826 for a structure constructor that wants to produce more than SIZE bytes.
3827 But such constructors will never be generated for any possible input.
3829 ALIGN is the alignment of the data in bits. */
3832 output_constant (exp, size, align)
3837 enum tree_code code;
3838 HOST_WIDE_INT thissize;
3840 /* Some front-ends use constants other than the standard language-independent
3841 varieties, but which may still be output directly. Give the front-end a
3842 chance to convert EXP to a language-independent representation. */
3843 exp = (*lang_hooks.expand_constant) (exp);
3845 if (size == 0 || flag_syntax_only)
3848 /* Eliminate any conversions since we'll be outputting the underlying
3850 while (TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
3851 || TREE_CODE (exp) == NON_LVALUE_EXPR
3852 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
3853 exp = TREE_OPERAND (exp, 0);
3855 code = TREE_CODE (TREE_TYPE (exp));
3856 thissize = int_size_in_bytes (TREE_TYPE (exp));
3858 /* Allow a constructor with no elements for any data type.
3859 This means to fill the space with zeros. */
3860 if (TREE_CODE (exp) == CONSTRUCTOR && CONSTRUCTOR_ELTS (exp) == 0)
3862 assemble_zeros (size);
3866 if (TREE_CODE (exp) == FDESC_EXPR)
3868 #ifdef ASM_OUTPUT_FDESC
3869 HOST_WIDE_INT part = tree_low_cst (TREE_OPERAND (exp, 1), 0);
3870 tree decl = TREE_OPERAND (exp, 0);
3871 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
3878 /* Now output the underlying data. If we've handling the padding, return.
3879 Otherwise, break and ensure THISSIZE is the size written. */
3887 case REFERENCE_TYPE:
3888 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
3889 EXPAND_INITIALIZER),
3891 error ("initializer for integer value is too complicated");
3895 if (TREE_CODE (exp) != REAL_CST)
3896 error ("initializer for floating value is not a floating constant");
3898 assemble_real (TREE_REAL_CST (exp),
3899 mode_for_size (size * BITS_PER_UNIT, MODE_FLOAT, 0),
3904 output_constant (TREE_REALPART (exp), thissize / 2, align);
3905 output_constant (TREE_IMAGPART (exp), thissize / 2,
3906 min_align (align, BITS_PER_UNIT * (thissize / 2)));
3911 if (TREE_CODE (exp) == CONSTRUCTOR)
3913 output_constructor (exp, size, align);
3916 else if (TREE_CODE (exp) == STRING_CST)
3918 thissize = MIN (TREE_STRING_LENGTH (exp), size);
3919 assemble_string (TREE_STRING_POINTER (exp), thissize);
3921 else if (TREE_CODE (exp) == VECTOR_CST)
3925 unsigned int nalign;
3926 enum machine_mode inner;
3928 inner = GET_MODE_INNER (TYPE_MODE (TREE_TYPE (exp)));
3929 nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
3931 elt_size = GET_MODE_UNIT_SIZE (TYPE_MODE (TREE_TYPE (exp)));
3933 link = TREE_VECTOR_CST_ELTS (exp);
3934 output_constant (TREE_VALUE (link), elt_size, align);
3935 while ((link = TREE_CHAIN (link)) != NULL)
3936 output_constant (TREE_VALUE (link), elt_size, nalign);
3944 if (TREE_CODE (exp) == CONSTRUCTOR)
3945 output_constructor (exp, size, align);
3951 if (TREE_CODE (exp) == INTEGER_CST)
3952 assemble_integer (expand_expr (exp, NULL_RTX,
3953 VOIDmode, EXPAND_INITIALIZER),
3954 thissize, align, 1);
3955 else if (TREE_CODE (exp) == CONSTRUCTOR)
3957 unsigned char *buffer = (unsigned char *) alloca (thissize);
3958 if (get_set_constructor_bytes (exp, buffer, thissize))
3960 assemble_string ((char *) buffer, thissize);
3963 error ("unknown set constructor type");
3975 assemble_zeros (size);
3979 /* Subroutine of output_constructor, used for computing the size of
3980 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
3981 type with an unspecified upper bound. */
3983 static unsigned HOST_WIDE_INT
3984 array_size_for_constructor (val)
3989 /* This code used to attempt to handle string constants that are not
3990 arrays of single-bytes, but nothing else does, so there's no point in
3992 if (TREE_CODE (val) == STRING_CST)
3993 return TREE_STRING_LENGTH (val);
3995 max_index = NULL_TREE;
3996 for (i = CONSTRUCTOR_ELTS (val); i; i = TREE_CHAIN (i))
3998 tree index = TREE_PURPOSE (i);
4000 if (TREE_CODE (index) == RANGE_EXPR)
4001 index = TREE_OPERAND (index, 1);
4002 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4006 if (max_index == NULL_TREE)
4009 /* Compute the total number of array elements. */
4010 i = size_binop (MINUS_EXPR, convert (sizetype, max_index),
4012 TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)))));
4013 i = size_binop (PLUS_EXPR, i, convert (sizetype, integer_one_node));
4015 /* Multiply by the array element unit size to find number of bytes. */
4016 i = size_binop (MULT_EXPR, i, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4018 return tree_low_cst (i, 1);
4021 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4022 Generate at least SIZE bytes, padding if necessary. */
4025 output_constructor (exp, size, align)
4030 tree type = TREE_TYPE (exp);
4031 tree link, field = 0;
4033 /* Number of bytes output or skipped so far.
4034 In other words, current position within the constructor. */
4035 HOST_WIDE_INT total_bytes = 0;
4036 /* Nonzero means BYTE contains part of a byte, to be output. */
4037 int byte_buffer_in_use = 0;
4040 if (HOST_BITS_PER_WIDE_INT < BITS_PER_UNIT)
4043 if (TREE_CODE (type) == RECORD_TYPE)
4044 field = TYPE_FIELDS (type);
4046 if (TREE_CODE (type) == ARRAY_TYPE
4047 && TYPE_DOMAIN (type) != 0)
4048 min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (type));
4050 /* As LINK goes through the elements of the constant,
4051 FIELD goes through the structure fields, if the constant is a structure.
4052 if the constant is a union, then we override this,
4053 by getting the field from the TREE_LIST element.
4054 But the constant could also be an array. Then FIELD is zero.
4056 There is always a maximum of one element in the chain LINK for unions
4057 (even if the initializer in a source program incorrectly contains
4059 for (link = CONSTRUCTOR_ELTS (exp);
4061 link = TREE_CHAIN (link),
4062 field = field ? TREE_CHAIN (field) : 0)
4064 tree val = TREE_VALUE (link);
4067 /* The element in a union constructor specifies the proper field
4069 if ((TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE
4070 || TREE_CODE (type) == QUAL_UNION_TYPE)
4071 && TREE_PURPOSE (link) != 0)
4072 field = TREE_PURPOSE (link);
4074 else if (TREE_CODE (type) == ARRAY_TYPE)
4075 index = TREE_PURPOSE (link);
4077 /* Eliminate the marker that makes a cast not be an lvalue. */
4081 if (index && TREE_CODE (index) == RANGE_EXPR)
4083 unsigned HOST_WIDE_INT fieldsize
4084 = int_size_in_bytes (TREE_TYPE (type));
4085 HOST_WIDE_INT lo_index = tree_low_cst (TREE_OPERAND (index, 0), 0);
4086 HOST_WIDE_INT hi_index = tree_low_cst (TREE_OPERAND (index, 1), 0);
4087 HOST_WIDE_INT index;
4088 unsigned int align2 = min_align (align, fieldsize * BITS_PER_UNIT);
4090 for (index = lo_index; index <= hi_index; index++)
4092 /* Output the element's initial value. */
4094 assemble_zeros (fieldsize);
4096 output_constant (val, fieldsize, align2);
4098 /* Count its size. */
4099 total_bytes += fieldsize;
4102 else if (field == 0 || !DECL_BIT_FIELD (field))
4104 /* An element that is not a bit-field. */
4106 unsigned HOST_WIDE_INT fieldsize;
4107 /* Since this structure is static,
4108 we know the positions are constant. */
4109 HOST_WIDE_INT pos = field ? int_byte_position (field) : 0;
4110 unsigned int align2;
4113 pos = (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val)), 1)
4114 * (tree_low_cst (index, 0) - tree_low_cst (min_index, 0)));
4116 /* Output any buffered-up bit-fields preceding this element. */
4117 if (byte_buffer_in_use)
4119 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4121 byte_buffer_in_use = 0;
4124 /* Advance to offset of this element.
4125 Note no alignment needed in an array, since that is guaranteed
4126 if each element has the proper size. */
4127 if ((field != 0 || index != 0) && pos != total_bytes)
4129 assemble_zeros (pos - total_bytes);
4133 /* Find the alignment of this element. */
4134 align2 = min_align (align, BITS_PER_UNIT * pos);
4136 /* Determine size this element should occupy. */
4141 /* If this is an array with an unspecified upper bound,
4142 the initializer determines the size. */
4143 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4144 but we cannot do this until the deprecated support for
4145 initializing zero-length array members is removed. */
4146 if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
4147 && TYPE_DOMAIN (TREE_TYPE (field))
4148 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field))))
4150 fieldsize = array_size_for_constructor (val);
4151 /* Given a non-empty initialization, this field had
4153 if (fieldsize != 0 && TREE_CHAIN (field) != NULL_TREE)
4156 else if (DECL_SIZE_UNIT (field))
4158 /* ??? This can't be right. If the decl size overflows
4159 a host integer we will silently emit no data. */
4160 if (host_integerp (DECL_SIZE_UNIT (field), 1))
4161 fieldsize = tree_low_cst (DECL_SIZE_UNIT (field), 1);
4165 fieldsize = int_size_in_bytes (TREE_TYPE (type));
4167 /* Output the element's initial value. */
4169 assemble_zeros (fieldsize);
4171 output_constant (val, fieldsize, align2);
4173 /* Count its size. */
4174 total_bytes += fieldsize;
4176 else if (val != 0 && TREE_CODE (val) != INTEGER_CST)
4177 error ("invalid initial value for member `%s'",
4178 IDENTIFIER_POINTER (DECL_NAME (field)));
4181 /* Element that is a bit-field. */
4183 HOST_WIDE_INT next_offset = int_bit_position (field);
4184 HOST_WIDE_INT end_offset
4185 = (next_offset + tree_low_cst (DECL_SIZE (field), 1));
4188 val = integer_zero_node;
4190 /* If this field does not start in this (or, next) byte,
4192 if (next_offset / BITS_PER_UNIT != total_bytes)
4194 /* Output remnant of any bit field in previous bytes. */
4195 if (byte_buffer_in_use)
4197 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4199 byte_buffer_in_use = 0;
4202 /* If still not at proper byte, advance to there. */
4203 if (next_offset / BITS_PER_UNIT != total_bytes)
4205 assemble_zeros (next_offset / BITS_PER_UNIT - total_bytes);
4206 total_bytes = next_offset / BITS_PER_UNIT;
4210 if (! byte_buffer_in_use)
4213 /* We must split the element into pieces that fall within
4214 separate bytes, and combine each byte with previous or
4215 following bit-fields. */
4217 /* next_offset is the offset n fbits from the beginning of
4218 the structure to the next bit of this element to be processed.
4219 end_offset is the offset of the first bit past the end of
4221 while (next_offset < end_offset)
4225 HOST_WIDE_INT value;
4226 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
4227 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
4229 /* Advance from byte to byte
4230 within this element when necessary. */
4231 while (next_byte != total_bytes)
4233 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4238 /* Number of bits we can process at once
4239 (all part of the same byte). */
4240 this_time = MIN (end_offset - next_offset,
4241 BITS_PER_UNIT - next_bit);
4242 if (BYTES_BIG_ENDIAN)
4244 /* On big-endian machine, take the most significant bits
4245 first (of the bits that are significant)
4246 and put them into bytes from the most significant end. */
4247 shift = end_offset - next_offset - this_time;
4249 /* Don't try to take a bunch of bits that cross
4250 the word boundary in the INTEGER_CST. We can
4251 only select bits from the LOW or HIGH part
4253 if (shift < HOST_BITS_PER_WIDE_INT
4254 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4256 this_time = shift + this_time - HOST_BITS_PER_WIDE_INT;
4257 shift = HOST_BITS_PER_WIDE_INT;
4260 /* Now get the bits from the appropriate constant word. */
4261 if (shift < HOST_BITS_PER_WIDE_INT)
4262 value = TREE_INT_CST_LOW (val);
4263 else if (shift < 2 * HOST_BITS_PER_WIDE_INT)
4265 value = TREE_INT_CST_HIGH (val);
4266 shift -= HOST_BITS_PER_WIDE_INT;
4271 /* Get the result. This works only when:
4272 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4273 byte |= (((value >> shift)
4274 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4275 << (BITS_PER_UNIT - this_time - next_bit));
4279 /* On little-endian machines,
4280 take first the least significant bits of the value
4281 and pack them starting at the least significant
4282 bits of the bytes. */
4283 shift = next_offset - int_bit_position (field);
4285 /* Don't try to take a bunch of bits that cross
4286 the word boundary in the INTEGER_CST. We can
4287 only select bits from the LOW or HIGH part
4289 if (shift < HOST_BITS_PER_WIDE_INT
4290 && shift + this_time > HOST_BITS_PER_WIDE_INT)
4291 this_time = (HOST_BITS_PER_WIDE_INT - shift);
4293 /* Now get the bits from the appropriate constant word. */
4294 if (shift < HOST_BITS_PER_WIDE_INT)
4295 value = TREE_INT_CST_LOW (val);
4296 else if (shift < 2 * HOST_BITS_PER_WIDE_INT)
4298 value = TREE_INT_CST_HIGH (val);
4299 shift -= HOST_BITS_PER_WIDE_INT;
4304 /* Get the result. This works only when:
4305 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4306 byte |= (((value >> shift)
4307 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
4311 next_offset += this_time;
4312 byte_buffer_in_use = 1;
4317 if (byte_buffer_in_use)
4319 assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
4323 if (total_bytes < size)
4324 assemble_zeros (size - total_bytes);
4327 /* This TREE_LIST contains any weak symbol declarations waiting
4329 static GTY(()) tree weak_decls;
4331 /* Mark DECL as weak. */
4337 DECL_WEAK (decl) = 1;
4339 if (DECL_RTL_SET_P (decl)
4340 && GET_CODE (DECL_RTL (decl)) == MEM
4341 && XEXP (DECL_RTL (decl), 0)
4342 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
4343 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
4346 /* Merge weak status between NEWDECL and OLDDECL. */
4349 merge_weak (newdecl, olddecl)
4353 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
4356 if (DECL_WEAK (newdecl))
4360 /* NEWDECL is weak, but OLDDECL is not. */
4362 /* If we already output the OLDDECL, we're in trouble; we can't
4363 go back and make it weak. This error cannot caught in
4364 declare_weak because the NEWDECL and OLDDECL was not yet
4365 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4366 if (TREE_ASM_WRITTEN (olddecl))
4367 error_with_decl (newdecl,
4368 "weak declaration of `%s' must precede definition");
4370 /* If we've already generated rtl referencing OLDDECL, we may
4371 have done so in a way that will not function properly with
4373 else if (TREE_USED (olddecl)
4374 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)))
4375 warning_with_decl (newdecl, "weak declaration of `%s' after first use results in unspecified behavior");
4379 /* We put the NEWDECL on the weak_decls list at some point.
4380 Replace it with the OLDDECL. */
4381 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
4382 if (TREE_VALUE (wd) == newdecl)
4384 TREE_VALUE (wd) = olddecl;
4387 /* We may not find the entry on the list. If NEWDECL is a
4388 weak alias, then we will have already called
4389 globalize_decl to remove the entry; in that case, we do
4390 not need to do anything. */
4393 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4394 mark_weak (olddecl);
4397 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4398 weak. Just update NEWDECL to indicate that it's weak too. */
4399 mark_weak (newdecl);
4402 /* Declare DECL to be a weak symbol. */
4408 if (! TREE_PUBLIC (decl))
4409 error_with_decl (decl, "weak declaration of `%s' must be public");
4410 else if (TREE_CODE (decl) == FUNCTION_DECL && TREE_ASM_WRITTEN (decl))
4411 error_with_decl (decl, "weak declaration of `%s' must precede definition");
4412 else if (SUPPORTS_WEAK)
4414 if (! DECL_WEAK (decl))
4415 weak_decls = tree_cons (NULL, decl, weak_decls);
4418 warning_with_decl (decl, "weak declaration of `%s' not supported");
4423 /* Emit any pending weak declarations. */
4430 for (t = weak_decls; t; t = TREE_CHAIN (t))
4432 tree decl = TREE_VALUE (t);
4433 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4434 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4437 if (! TREE_USED (decl))
4440 #ifdef ASM_WEAKEN_DECL
4441 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
4443 #ifdef ASM_WEAKEN_LABEL
4444 ASM_WEAKEN_LABEL (asm_out_file, name);
4446 #ifdef ASM_OUTPUT_WEAK_ALIAS
4447 warning ("only weak aliases are supported in this configuration");
4455 /* Emit the assembly bits to indicate that DECL is globally visible. */
4458 globalize_decl (decl)
4461 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
4463 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
4464 if (DECL_WEAK (decl))
4468 #ifdef ASM_WEAKEN_DECL
4469 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
4471 ASM_WEAKEN_LABEL (asm_out_file, name);
4474 /* Remove this function from the pending weak list so that
4475 we do not emit multiple .weak directives for it. */
4476 for (p = &weak_decls; (t = *p) ; )
4478 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
4479 *p = TREE_CHAIN (t);
4481 p = &TREE_CHAIN (t);
4487 (*targetm.asm_out.globalize_label) (asm_out_file, name);
4490 /* Emit an assembler directive to make the symbol for DECL an alias to
4491 the symbol for TARGET. */
4494 assemble_alias (decl, target)
4495 tree decl, target ATTRIBUTE_UNUSED;
4499 /* We must force creation of DECL_RTL for debug info generation, even though
4500 we don't use it here. */
4501 make_decl_rtl (decl, NULL);
4503 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
4505 #ifdef ASM_OUTPUT_DEF
4506 /* Make name accessible from other files, if appropriate. */
4508 if (TREE_PUBLIC (decl))
4510 globalize_decl (decl);
4511 maybe_assemble_visibility (decl);
4514 #ifdef ASM_OUTPUT_DEF_FROM_DECLS
4515 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
4517 ASM_OUTPUT_DEF (asm_out_file, name, IDENTIFIER_POINTER (target));
4519 #else /* !ASM_OUTPUT_DEF */
4520 #if defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
4521 if (! DECL_WEAK (decl))
4522 warning ("only weak aliases are supported in this configuration");
4524 #ifdef ASM_WEAKEN_DECL
4525 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
4527 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
4530 warning ("alias definitions not supported in this configuration; ignored");
4534 TREE_USED (decl) = 1;
4535 TREE_ASM_WRITTEN (decl) = 1;
4536 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
4539 /* Emit an assembler directive to set symbol for DECL visibility to
4540 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
4543 default_assemble_visibility (decl, vis)
4547 static const char * const visibility_types[] = {
4548 NULL, "internal", "hidden", "protected"
4551 const char *name, *type;
4553 name = (* targetm.strip_name_encoding)
4554 (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)));
4555 type = visibility_types[vis];
4557 #ifdef HAVE_GAS_HIDDEN
4558 fprintf (asm_out_file, "\t.%s\t%s\n", type, name);
4560 warning ("visibility attribute not supported in this configuration; ignored");
4564 /* A helper function to call assemble_visibility when needed for a decl. */
4567 maybe_assemble_visibility (decl)
4570 enum symbol_visibility vis = decl_visibility (decl);
4572 if (vis != VISIBILITY_DEFAULT)
4573 (* targetm.asm_out.visibility) (decl, vis);
4576 /* Returns 1 if the target configuration supports defining public symbols
4577 so that one of them will be chosen at link time instead of generating a
4578 multiply-defined symbol error, whether through the use of weak symbols or
4579 a target-specific mechanism for having duplicates discarded. */
4582 supports_one_only ()
4584 if (SUPPORTS_ONE_ONLY)
4586 return SUPPORTS_WEAK;
4589 /* Set up DECL as a public symbol that can be defined in multiple
4590 translation units without generating a linker error. */
4593 make_decl_one_only (decl)
4596 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)
4599 TREE_PUBLIC (decl) = 1;
4601 if (TREE_CODE (decl) == VAR_DECL
4602 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
4603 DECL_COMMON (decl) = 1;
4604 else if (SUPPORTS_ONE_ONLY)
4606 #ifdef MAKE_DECL_ONE_ONLY
4607 MAKE_DECL_ONE_ONLY (decl);
4609 DECL_ONE_ONLY (decl) = 1;
4611 else if (SUPPORTS_WEAK)
4612 DECL_WEAK (decl) = 1;
4620 const_str_htab = htab_create_ggc (128, const_str_htab_hash,
4621 const_str_htab_eq, NULL);
4622 in_named_htab = htab_create_ggc (31, in_named_entry_hash,
4623 in_named_entry_eq, NULL);
4625 const_alias_set = new_alias_set ();
4629 decl_tls_model (decl)
4632 enum tls_model kind;
4633 tree attr = lookup_attribute ("tls_model", DECL_ATTRIBUTES (decl));
4638 attr = TREE_VALUE (TREE_VALUE (attr));
4639 if (TREE_CODE (attr) != STRING_CST)
4641 if (!strcmp (TREE_STRING_POINTER (attr), "local-exec"))
4642 kind = TLS_MODEL_LOCAL_EXEC;
4643 else if (!strcmp (TREE_STRING_POINTER (attr), "initial-exec"))
4644 kind = TLS_MODEL_INITIAL_EXEC;
4645 else if (!strcmp (TREE_STRING_POINTER (attr), "local-dynamic"))
4646 kind = optimize ? TLS_MODEL_LOCAL_DYNAMIC : TLS_MODEL_GLOBAL_DYNAMIC;
4647 else if (!strcmp (TREE_STRING_POINTER (attr), "global-dynamic"))
4648 kind = TLS_MODEL_GLOBAL_DYNAMIC;
4654 is_local = (*targetm.binds_local_p) (decl);
4658 kind = TLS_MODEL_LOCAL_EXEC;
4660 kind = TLS_MODEL_INITIAL_EXEC;
4662 /* Local dynamic is inefficient when we're not combining the
4663 parts of the address. */
4664 else if (optimize && is_local)
4665 kind = TLS_MODEL_LOCAL_DYNAMIC;
4667 kind = TLS_MODEL_GLOBAL_DYNAMIC;
4668 if (kind < flag_tls_default)
4669 kind = flag_tls_default;
4674 enum symbol_visibility
4675 decl_visibility (decl)
4678 tree attr = lookup_attribute ("visibility", DECL_ATTRIBUTES (decl));
4682 const char *which = TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr)));
4684 if (strcmp (which, "default") == 0)
4685 return VISIBILITY_DEFAULT;
4686 if (strcmp (which, "internal") == 0)
4687 return VISIBILITY_INTERNAL;
4688 if (strcmp (which, "hidden") == 0)
4689 return VISIBILITY_HIDDEN;
4690 if (strcmp (which, "protected") == 0)
4691 return VISIBILITY_PROTECTED;
4696 return VISIBILITY_DEFAULT;
4699 /* Select a set of attributes for section NAME based on the properties
4700 of DECL and whether or not RELOC indicates that DECL's initializer
4701 might contain runtime relocations.
4703 We make the section read-only and executable for a function decl,
4704 read-only for a const data decl, and writable for a non-const data decl. */
4707 default_section_type_flags (decl, name, reloc)
4712 return default_section_type_flags_1 (decl, name, reloc, flag_pic);
4716 default_section_type_flags_1 (decl, name, reloc, shlib)
4724 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
4725 flags = SECTION_CODE;
4726 else if (decl && decl_readonly_section_1 (decl, reloc, shlib))
4729 flags = SECTION_WRITE;
4731 if (decl && DECL_ONE_ONLY (decl))
4732 flags |= SECTION_LINKONCE;
4734 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL (decl))
4735 flags |= SECTION_TLS | SECTION_WRITE;
4737 if (strcmp (name, ".bss") == 0
4738 || strncmp (name, ".bss.", 5) == 0
4739 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
4740 || strcmp (name, ".sbss") == 0
4741 || strncmp (name, ".sbss.", 6) == 0
4742 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0
4743 || strcmp (name, ".tbss") == 0
4744 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
4745 flags |= SECTION_BSS;
4747 if (strcmp (name, ".tdata") == 0
4748 || strcmp (name, ".tbss") == 0
4749 || strncmp (name, ".gnu.linkonce.td.", 17) == 0
4750 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
4751 flags |= SECTION_TLS;
4753 /* These three sections have special ELF types. They are neither
4754 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
4755 want to print a section type (@progbits or @nobits). If someone
4756 is silly enough to emit code or TLS variables to one of these
4757 sections, then don't handle them specially. */
4758 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
4759 && (strcmp (name, ".init_array") == 0
4760 || strcmp (name, ".fini_array") == 0
4761 || strcmp (name, ".preinit_array") == 0))
4762 flags |= SECTION_NOTYPE;
4767 /* Output assembly to switch to section NAME with attribute FLAGS.
4768 Four variants for common object file formats. */
4771 default_no_named_section (name, flags)
4772 const char *name ATTRIBUTE_UNUSED;
4773 unsigned int flags ATTRIBUTE_UNUSED;
4775 /* Some object formats don't support named sections at all. The
4776 front-end should already have flagged this as an error. */
4781 default_elf_asm_named_section (name, flags)
4785 char flagchars[10], *f = flagchars;
4787 if (! named_section_first_declaration (name))
4789 fprintf (asm_out_file, "\t.section\t%s\n", name);
4793 if (!(flags & SECTION_DEBUG))
4795 if (flags & SECTION_WRITE)
4797 if (flags & SECTION_CODE)
4799 if (flags & SECTION_SMALL)
4801 if (flags & SECTION_MERGE)
4803 if (flags & SECTION_STRINGS)
4805 if (flags & SECTION_TLS)
4809 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
4811 if (!(flags & SECTION_NOTYPE))
4815 if (flags & SECTION_BSS)
4820 fprintf (asm_out_file, ",@%s", type);
4822 if (flags & SECTION_ENTSIZE)
4823 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
4826 putc ('\n', asm_out_file);
4830 default_coff_asm_named_section (name, flags)
4834 char flagchars[8], *f = flagchars;
4836 if (flags & SECTION_WRITE)
4838 if (flags & SECTION_CODE)
4842 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
4846 default_pe_asm_named_section (name, flags)
4850 default_coff_asm_named_section (name, flags);
4852 if (flags & SECTION_LINKONCE)
4854 /* Functions may have been compiled at various levels of
4855 optimization so we can't use `same_size' here.
4856 Instead, have the linker pick one. */
4857 fprintf (asm_out_file, "\t.linkonce %s\n",
4858 (flags & SECTION_CODE ? "discard" : "same_size"));
4862 /* Used for vtable gc in GNU binutils. Record that the pointer at OFFSET
4863 from SYMBOL is used in all classes derived from SYMBOL. */
4866 assemble_vtable_entry (symbol, offset)
4868 HOST_WIDE_INT offset;
4870 fputs ("\t.vtable_entry ", asm_out_file);
4871 output_addr_const (asm_out_file, symbol);
4872 fputs (", ", asm_out_file);
4873 fprintf (asm_out_file, HOST_WIDE_INT_PRINT_DEC, offset);
4874 fputc ('\n', asm_out_file);
4877 /* Used for vtable gc in GNU binutils. Record the class hierarchy by noting
4878 that the vtable symbol CHILD is derived from the vtable symbol PARENT. */
4881 assemble_vtable_inherit (child, parent)
4884 fputs ("\t.vtable_inherit ", asm_out_file);
4885 output_addr_const (asm_out_file, child);
4886 fputs (", ", asm_out_file);
4887 output_addr_const (asm_out_file, parent);
4888 fputc ('\n', asm_out_file);
4891 /* The lame default section selector. */
4894 default_select_section (decl, reloc, align)
4897 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED;
4899 bool readonly = false;
4903 if (decl_readonly_section (decl, reloc))
4906 else if (TREE_CODE (decl) == CONSTRUCTOR)
4908 if (! ((flag_pic && reloc)
4909 || !TREE_READONLY (decl)
4910 || TREE_SIDE_EFFECTS (decl)
4911 || !TREE_CONSTANT (decl)))
4914 else if (TREE_CODE (decl) == STRING_CST)
4915 readonly = !flag_writable_strings;
4916 else if (! (flag_pic && reloc))
4920 readonly_data_section ();
4925 /* A helper function for default_elf_select_section and
4926 default_elf_unique_section. Categorizes the DECL. */
4928 enum section_category
4933 SECCAT_RODATA_MERGE_STR,
4934 SECCAT_RODATA_MERGE_STR_INIT,
4935 SECCAT_RODATA_MERGE_CONST,
4940 /* To optimize loading of shared programs, define following subsections
4942 _REL Contains data that has relocations, so they get grouped
4943 together and dynamic linker will visit fewer pages in memory.
4944 _RO Contains data that is otherwise read-only. This is useful
4945 with prelinking as most relocations won't be dynamically
4946 linked and thus stay read only.
4947 _LOCAL Marks data containing relocations only to local objects.
4948 These relocations will get fully resolved by prelinking. */
4950 SECCAT_DATA_REL_LOCAL,
4952 SECCAT_DATA_REL_RO_LOCAL,
4962 static enum section_category
4963 categorize_decl_for_section PARAMS ((tree, int, int));
4965 static enum section_category
4966 categorize_decl_for_section (decl, reloc, shlib)
4971 enum section_category ret;
4973 if (TREE_CODE (decl) == FUNCTION_DECL)
4975 else if (TREE_CODE (decl) == STRING_CST)
4977 if (flag_writable_strings)
4980 return SECCAT_RODATA_MERGE_STR;
4982 else if (TREE_CODE (decl) == VAR_DECL)
4984 if (DECL_INITIAL (decl) == NULL
4985 || DECL_INITIAL (decl) == error_mark_node)
4987 else if (! TREE_READONLY (decl)
4988 || TREE_SIDE_EFFECTS (decl)
4989 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
4991 if (shlib && (reloc & 2))
4992 ret = SECCAT_DATA_REL;
4993 else if (shlib && reloc)
4994 ret = SECCAT_DATA_REL_LOCAL;
4998 else if (shlib && (reloc & 2))
4999 ret = SECCAT_DATA_REL_RO;
5000 else if (shlib && reloc)
5001 ret = SECCAT_DATA_REL_RO_LOCAL;
5002 else if (reloc || flag_merge_constants < 2)
5003 /* C and C++ don't allow different variables to share the same
5004 location. -fmerge-all-constants allows even that (at the
5005 expense of not conforming). */
5006 ret = SECCAT_RODATA;
5007 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
5008 ret = SECCAT_RODATA_MERGE_STR_INIT;
5010 ret = SECCAT_RODATA_MERGE_CONST;
5012 else if (TREE_CODE (decl) == CONSTRUCTOR)
5014 if ((shlib && reloc)
5015 || TREE_SIDE_EFFECTS (decl)
5016 || ! TREE_CONSTANT (decl))
5019 ret = SECCAT_RODATA;
5022 ret = SECCAT_RODATA;
5024 /* There are no read-only thread-local sections. */
5025 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL (decl))
5027 if (ret == SECCAT_BSS)
5033 /* If the target uses small data sections, select it. */
5034 else if ((*targetm.in_small_data_p) (decl))
5036 if (ret == SECCAT_BSS)
5038 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
5039 ret = SECCAT_SRODATA;
5048 decl_readonly_section (decl, reloc)
5052 return decl_readonly_section_1 (decl, reloc, flag_pic);
5056 decl_readonly_section_1 (decl, reloc, shlib)
5061 switch (categorize_decl_for_section (decl, reloc, shlib))
5064 case SECCAT_RODATA_MERGE_STR:
5065 case SECCAT_RODATA_MERGE_STR_INIT:
5066 case SECCAT_RODATA_MERGE_CONST:
5067 case SECCAT_SRODATA:
5076 /* Select a section based on the above categorization. */
5079 default_elf_select_section (decl, reloc, align)
5082 unsigned HOST_WIDE_INT align;
5084 default_elf_select_section_1 (decl, reloc, align, flag_pic);
5088 default_elf_select_section_1 (decl, reloc, align, shlib)
5091 unsigned HOST_WIDE_INT align;
5094 switch (categorize_decl_for_section (decl, reloc, shlib))
5097 /* We're not supposed to be called on FUNCTION_DECLs. */
5100 readonly_data_section ();
5102 case SECCAT_RODATA_MERGE_STR:
5103 mergeable_string_section (decl, align, 0);
5105 case SECCAT_RODATA_MERGE_STR_INIT:
5106 mergeable_string_section (DECL_INITIAL (decl), align, 0);
5108 case SECCAT_RODATA_MERGE_CONST:
5109 mergeable_constant_section (DECL_MODE (decl), align, 0);
5111 case SECCAT_SRODATA:
5112 named_section (NULL_TREE, ".sdata2", reloc);
5117 case SECCAT_DATA_REL:
5118 named_section (NULL_TREE, ".data.rel", reloc);
5120 case SECCAT_DATA_REL_LOCAL:
5121 named_section (NULL_TREE, ".data.rel.local", reloc);
5123 case SECCAT_DATA_REL_RO:
5124 named_section (NULL_TREE, ".data.rel.ro", reloc);
5126 case SECCAT_DATA_REL_RO_LOCAL:
5127 named_section (NULL_TREE, ".data.rel.ro.local", reloc);
5130 named_section (NULL_TREE, ".sdata", reloc);
5133 named_section (NULL_TREE, ".tdata", reloc);
5136 #ifdef BSS_SECTION_ASM_OP
5139 named_section (NULL_TREE, ".bss", reloc);
5143 named_section (NULL_TREE, ".sbss", reloc);
5146 named_section (NULL_TREE, ".tbss", reloc);
5153 /* Construct a unique section name based on the decl name and the
5154 categorization performed above. */
5157 default_unique_section (decl, reloc)
5161 default_unique_section_1 (decl, reloc, flag_pic);
5165 default_unique_section_1 (decl, reloc, shlib)
5170 bool one_only = DECL_ONE_ONLY (decl);
5171 const char *prefix, *name;
5175 switch (categorize_decl_for_section (decl, reloc, shlib))
5178 prefix = one_only ? ".gnu.linkonce.t." : ".text.";
5181 case SECCAT_RODATA_MERGE_STR:
5182 case SECCAT_RODATA_MERGE_STR_INIT:
5183 case SECCAT_RODATA_MERGE_CONST:
5184 prefix = one_only ? ".gnu.linkonce.r." : ".rodata.";
5186 case SECCAT_SRODATA:
5187 prefix = one_only ? ".gnu.linkonce.s2." : ".sdata2.";
5190 case SECCAT_DATA_REL:
5191 case SECCAT_DATA_REL_LOCAL:
5192 case SECCAT_DATA_REL_RO:
5193 case SECCAT_DATA_REL_RO_LOCAL:
5194 prefix = one_only ? ".gnu.linkonce.d." : ".data.";
5197 prefix = one_only ? ".gnu.linkonce.s." : ".sdata.";
5200 prefix = one_only ? ".gnu.linkonce.b." : ".bss.";
5203 prefix = one_only ? ".gnu.linkonce.sb." : ".sbss.";
5206 prefix = one_only ? ".gnu.linkonce.td." : ".tdata.";
5209 prefix = one_only ? ".gnu.linkonce.tb." : ".tbss.";
5214 plen = strlen (prefix);
5216 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5217 name = (* targetm.strip_name_encoding) (name);
5218 nlen = strlen (name);
5220 string = alloca (nlen + plen + 1);
5221 memcpy (string, prefix, plen);
5222 memcpy (string + plen, name, nlen + 1);
5224 DECL_SECTION_NAME (decl) = build_string (nlen + plen, string);
5228 default_select_rtx_section (mode, x, align)
5229 enum machine_mode mode ATTRIBUTE_UNUSED;
5231 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED;
5234 switch (GET_CODE (x))
5246 readonly_data_section ();
5250 default_elf_select_rtx_section (mode, x, align)
5251 enum machine_mode mode;
5253 unsigned HOST_WIDE_INT align;
5255 /* ??? Handle small data here somehow. */
5258 switch (GET_CODE (x))
5262 named_section (NULL_TREE, ".data.rel.ro", 3);
5266 named_section (NULL_TREE, ".data.rel.ro.local", 1);
5273 mergeable_constant_section (mode, align, 0);
5276 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
5279 default_encode_section_info (decl, rtl, first)
5282 int first ATTRIBUTE_UNUSED;
5287 /* Careful not to prod global register variables. */
5288 if (GET_CODE (rtl) != MEM)
5290 symbol = XEXP (rtl, 0);
5291 if (GET_CODE (symbol) != SYMBOL_REF)
5295 if (TREE_CODE (decl) == FUNCTION_DECL)
5296 flags |= SYMBOL_FLAG_FUNCTION;
5297 if ((*targetm.binds_local_p) (decl))
5298 flags |= SYMBOL_FLAG_LOCAL;
5299 if ((*targetm.in_small_data_p) (decl))
5300 flags |= SYMBOL_FLAG_SMALL;
5301 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL (decl))
5302 flags |= decl_tls_model (decl) << SYMBOL_FLAG_TLS_SHIFT;
5303 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
5304 being PUBLIC, the thing *must* be defined in this translation unit.
5305 Prevent this buglet from being propagated into rtl code as well. */
5306 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
5307 flags |= SYMBOL_FLAG_EXTERNAL;
5309 SYMBOL_REF_FLAGS (symbol) = flags;
5312 /* By default, we do nothing for encode_section_info, so we need not
5313 do anything but discard the '*' marker. */
5316 default_strip_name_encoding (str)
5319 return str + (*str == '*');
5322 /* Assume ELF-ish defaults, since that's pretty much the most liberal
5323 wrt cross-module name binding. */
5326 default_binds_local_p (exp)
5329 return default_binds_local_p_1 (exp, flag_pic);
5333 default_binds_local_p_1 (exp, shlib)
5339 /* A non-decl is an entry in the constant pool. */
5342 /* Static variables are always local. */
5343 else if (! TREE_PUBLIC (exp))
5345 /* A variable is local if the user tells us so. */
5346 else if (decl_visibility (exp) != VISIBILITY_DEFAULT)
5348 /* Otherwise, variables defined outside this object may not be local. */
5349 else if (DECL_EXTERNAL (exp))
5351 /* Linkonce and weak data are never local. */
5352 else if (DECL_ONE_ONLY (exp) || DECL_WEAK (exp))
5354 /* If PIC, then assume that any global name can be overridden by
5355 symbols resolved from other modules. */
5358 /* Uninitialized COMMON variable may be unified with symbols
5359 resolved from other modules. */
5360 else if (DECL_COMMON (exp)
5361 && (DECL_INITIAL (exp) == NULL
5362 || DECL_INITIAL (exp) == error_mark_node))
5364 /* Otherwise we're left with initialized (or non-common) global data
5365 which is of necessity defined locally. */
5372 /* Determine whether or not a pointer mode is valid. Assume defaults
5373 of ptr_mode or Pmode - can be overridden. */
5375 default_valid_pointer_mode (mode)
5376 enum machine_mode mode;
5378 return (mode == ptr_mode || mode == Pmode);
5381 /* Default function to output code that will globalize a label. A
5382 target must define GLOBAL_ASM_OP or provide it's own function to
5383 globalize a label. */
5384 #ifdef GLOBAL_ASM_OP
5386 default_globalize_label (stream, name)
5390 fputs (GLOBAL_ASM_OP, stream);
5391 assemble_name (stream, name);
5392 putc ('\n', stream);
5394 #endif /* GLOBAL_ASM_OP */
5396 /* This is how to output an internal numbered label where PREFIX is
5397 the class of label and LABELNO is the number within the class. */
5400 default_internal_label (stream, prefix, labelno)
5403 unsigned long labelno;
5405 char *const buf = alloca (40 + strlen (prefix));
5406 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
5407 ASM_OUTPUT_LABEL (stream, buf);
5410 #include "gt-varasm.h"