1 /* Functions for generic Darwin as target machine for GNU C compiler.
2 Copyright (C) 1989, 1990, 1991, 1992, 1993, 2000, 2001, 2002, 2003, 2004,
4 Free Software Foundation, Inc.
5 Contributed by Apple Computer Inc.
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING. If not, write to
21 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
22 Boston, MA 02110-1301, USA. */
26 #include "coretypes.h"
30 #include "hard-reg-set.h"
32 #include "insn-config.h"
33 #include "conditions.h"
34 #include "insn-flags.h"
36 #include "insn-attr.h"
43 #include "langhooks.h"
51 /* Darwin supports a feature called fix-and-continue, which is used
52 for rapid turn around debugging. When code is compiled with the
53 -mfix-and-continue flag, two changes are made to the generated code
54 that allow the system to do things that it would normally not be
55 able to do easily. These changes allow gdb to load in
56 recompilation of a translation unit that has been changed into a
57 running program and replace existing functions and methods of that
58 translation unit with versions of those functions and methods
59 from the newly compiled translation unit. The new functions access
60 the existing static symbols from the old translation unit, if the
61 symbol existed in the unit to be replaced, and from the new
62 translation unit, otherwise.
64 The changes are to insert 5 nops at the beginning of all functions
65 and to use indirection to get at static symbols. The 5 nops
66 are required by consumers of the generated code. Currently, gdb
67 uses this to patch in a jump to the overriding function, this
68 allows all uses of the old name to forward to the replacement,
69 including existing function pointers and virtual methods. See
70 rs6000_emit_prologue for the code that handles the nop insertions.
72 The added indirection allows gdb to redirect accesses to static
73 symbols from the newly loaded translation unit to the existing
74 symbol, if any. @code{static} symbols are special and are handled by
75 setting the second word in the .non_lazy_symbol_pointer data
76 structure to symbol. See indirect_data for the code that handles
77 the extra indirection, and machopic_output_indirection and its use
78 of MACHO_SYMBOL_STATIC for the code that handles @code{static}
79 symbol indirection. */
82 section * darwin_sections[NUM_DARWIN_SECTIONS];
84 /* True if we're setting __attribute__ ((ms_struct)). */
85 int darwin_ms_struct = false;
87 /* A get_unnamed_section callback used to switch to an ObjC section.
88 DIRECTIVE is as for output_section_asm_op. */
91 output_objc_section_asm_op (const void *directive)
93 static bool been_here = false;
97 static const enum darwin_section_enum tomark[] =
99 /* written, cold -> hot */
100 objc_cat_cls_meth_section,
101 objc_cat_inst_meth_section,
102 objc_string_object_section,
103 objc_constant_string_object_section,
104 objc_selector_refs_section,
105 objc_selector_fixup_section,
106 objc_cls_refs_section,
108 objc_meta_class_section,
109 /* shared, hot -> cold */
110 objc_cls_meth_section,
111 objc_inst_meth_section,
112 objc_protocol_section,
113 objc_class_names_section,
114 objc_meth_var_types_section,
115 objc_meth_var_names_section,
116 objc_category_section,
117 objc_class_vars_section,
118 objc_instance_vars_section,
119 objc_module_info_section,
125 for (i = 0; i < ARRAY_SIZE (tomark); i++)
126 switch_to_section (darwin_sections[tomark[i]]);
128 output_section_asm_op (directive);
131 /* Implement TARGET_ASM_INIT_SECTIONS. */
134 darwin_init_sections (void)
136 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) \
137 darwin_sections[NAME] = \
138 get_unnamed_section (FLAGS, (OBJC \
139 ? output_objc_section_asm_op \
140 : output_section_asm_op), \
142 #include "config/darwin-sections.def"
145 readonly_data_section = darwin_sections[const_section];
146 exception_section = darwin_sections[darwin_exception_section];
147 eh_frame_section = darwin_sections[darwin_eh_frame_section];
151 name_needs_quotes (const char *name)
154 while ((c = *name++) != '\0')
155 if (! ISIDNUM (c) && c != '.' && c != '$')
160 /* Return true if SYM_REF can be used without an indirection. */
162 machopic_symbol_defined_p (rtx sym_ref)
164 if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED)
167 /* If a symbol references local and is not an extern to this
168 file, then the symbol might be able to declared as defined. */
169 if (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref))
171 /* If the symbol references a variable and the variable is a
172 common symbol, then this symbol is not defined. */
173 if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_VARIABLE)
175 tree decl = SYMBOL_REF_DECL (sym_ref);
178 if (DECL_COMMON (decl))
186 /* This module assumes that (const (symbol_ref "foo")) is a legal pic
187 reference, which will not be changed. */
189 enum machopic_addr_class
190 machopic_classify_symbol (rtx sym_ref)
195 flags = SYMBOL_REF_FLAGS (sym_ref);
196 function_p = SYMBOL_REF_FUNCTION_P (sym_ref);
197 if (machopic_symbol_defined_p (sym_ref))
199 ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA);
202 ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA);
205 #ifndef TARGET_FIX_AND_CONTINUE
206 #define TARGET_FIX_AND_CONTINUE 0
209 /* Indicate when fix-and-continue style code generation is being used
210 and when a reference to data should be indirected so that it can be
211 rebound in a new translation unit to reference the original instance
212 of that data. Symbol names that are for code generation local to
213 the translation unit are bound to the new translation unit;
214 currently this means symbols that begin with L or _OBJC_;
215 otherwise, we indicate that an indirect reference should be made to
216 permit the runtime to rebind new instances of the translation unit
217 to the original instance of the data. */
220 indirect_data (rtx sym_ref)
225 /* If we aren't generating fix-and-continue code, don't do anything
227 if (TARGET_FIX_AND_CONTINUE == 0)
230 /* Otherwise, all symbol except symbols that begin with L or _OBJC_
231 are indirected. Symbols that begin with L and _OBJC_ are always
232 bound to the current translation unit as they are used for
233 generated local data of the translation unit. */
235 name = XSTR (sym_ref, 0);
237 lprefix = (((name[0] == '*' || name[0] == '&')
238 && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L')))
239 || (strncmp (name, "_OBJC_", 6) == 0));
246 machopic_data_defined_p (rtx sym_ref)
248 if (indirect_data (sym_ref))
251 switch (machopic_classify_symbol (sym_ref))
253 case MACHOPIC_DEFINED_DATA:
254 case MACHOPIC_DEFINED_FUNCTION:
262 machopic_define_symbol (rtx mem)
266 gcc_assert (GET_CODE (mem) == MEM);
267 sym_ref = XEXP (mem, 0);
268 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
271 static GTY(()) char * function_base;
274 machopic_function_base_name (void)
276 /* if dynamic-no-pic is on, we should not get here */
277 gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);
279 if (function_base == NULL)
281 (char *) ggc_alloc_string ("<pic base>", sizeof ("<pic base>"));
283 current_function_uses_pic_offset_table = 1;
285 return function_base;
288 /* Return a SYMBOL_REF for the PIC function base. */
291 machopic_function_base_sym (void)
295 sym_ref = gen_rtx_SYMBOL_REF (Pmode, machopic_function_base_name ());
296 SYMBOL_REF_FLAGS (sym_ref)
297 |= (MACHO_SYMBOL_FLAG_VARIABLE | MACHO_SYMBOL_FLAG_DEFINED);
301 /* Return either ORIG or (const:P (minus:P ORIG PIC_BASE)), depending
302 on whether pic_base is NULL or not. */
304 gen_pic_offset (rtx orig, rtx pic_base)
309 return gen_rtx_CONST (Pmode, gen_rtx_MINUS (Pmode, orig, pic_base));
312 static GTY(()) const char * function_base_func_name;
313 static GTY(()) int current_pic_label_num;
316 machopic_output_function_base_name (FILE *file)
318 const char *current_name;
320 /* If dynamic-no-pic is on, we should not get here. */
321 gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);
323 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
324 if (function_base_func_name != current_name)
326 ++current_pic_label_num;
327 function_base_func_name = current_name;
329 fprintf (file, "\"L%011d$pb\"", current_pic_label_num);
332 /* The suffix attached to non-lazy pointer symbols. */
333 #define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr"
334 /* The suffix attached to stub symbols. */
335 #define STUB_SUFFIX "$stub"
337 typedef struct machopic_indirection GTY (())
339 /* The SYMBOL_REF for the entity referenced. */
341 /* The name of the stub or non-lazy pointer. */
342 const char * ptr_name;
343 /* True iff this entry is for a stub (as opposed to a non-lazy
346 /* True iff this stub or pointer pointer has been referenced. */
348 } machopic_indirection;
350 /* A table mapping stub names and non-lazy pointer names to
351 SYMBOL_REFs for the stubbed-to and pointed-to entities. */
353 static GTY ((param_is (struct machopic_indirection))) htab_t
354 machopic_indirections;
356 /* Return a hash value for a SLOT in the indirections hash table. */
359 machopic_indirection_hash (const void *slot)
361 const machopic_indirection *p = (const machopic_indirection *) slot;
362 return htab_hash_string (p->ptr_name);
365 /* Returns true if the KEY is the same as that associated with
369 machopic_indirection_eq (const void *slot, const void *key)
371 return strcmp (((const machopic_indirection *) slot)->ptr_name, key) == 0;
374 /* Return the name of the non-lazy pointer (if STUB_P is false) or
375 stub (if STUB_B is true) corresponding to the given name. */
378 machopic_indirection_name (rtx sym_ref, bool stub_p)
381 const char *name = XSTR (sym_ref, 0);
382 size_t namelen = strlen (name);
383 machopic_indirection *p;
385 bool saw_star = false;
388 const char *prefix = user_label_prefix;
389 const char *quote = "";
392 id = maybe_get_identifier (name);
397 while (IDENTIFIER_TRANSPARENT_ALIAS (id))
398 id = TREE_CHAIN (id);
401 name = IDENTIFIER_POINTER (id);
402 namelen = strlen (name);
414 needs_quotes = name_needs_quotes (name);
421 suffix = STUB_SUFFIX;
423 suffix = NON_LAZY_POINTER_SUFFIX;
425 buffer = alloca (strlen ("&L")
432 /* Construct the name of the non-lazy pointer or stub. */
433 sprintf (buffer, "&%sL%s%s%s%s", quote, prefix, name, suffix, quote);
435 if (!machopic_indirections)
436 machopic_indirections = htab_create_ggc (37,
437 machopic_indirection_hash,
438 machopic_indirection_eq,
441 slot = htab_find_slot_with_hash (machopic_indirections, buffer,
442 htab_hash_string (buffer), INSERT);
445 p = (machopic_indirection *) *slot;
449 p = (machopic_indirection *) ggc_alloc (sizeof (machopic_indirection));
451 p->ptr_name = xstrdup (buffer);
460 /* Return the name of the stub for the mcount function. */
463 machopic_mcount_stub_name (void)
465 rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount");
466 return machopic_indirection_name (symbol, /*stub_p=*/true);
469 /* If NAME is the name of a stub or a non-lazy pointer , mark the stub
470 or non-lazy pointer as used -- and mark the object to which the
471 pointer/stub refers as used as well, since the pointer/stub will
472 emit a reference to it. */
475 machopic_validate_stub_or_non_lazy_ptr (const char *name)
477 machopic_indirection *p;
479 p = ((machopic_indirection *)
480 (htab_find_with_hash (machopic_indirections, name,
481 htab_hash_string (name))));
484 const char *real_name;
489 /* Do what output_addr_const will do when we actually call it. */
490 if (SYMBOL_REF_DECL (p->symbol))
491 mark_decl_referenced (SYMBOL_REF_DECL (p->symbol));
493 real_name = targetm.strip_name_encoding (XSTR (p->symbol, 0));
495 id = maybe_get_identifier (real_name);
497 mark_referenced (id);
501 /* Transform ORIG, which may be any data source, to the corresponding
502 source using indirections. */
505 machopic_indirect_data_reference (rtx orig, rtx reg)
509 if (! MACHOPIC_INDIRECT)
512 if (GET_CODE (orig) == SYMBOL_REF)
514 int defined = machopic_data_defined_p (orig);
516 if (defined && MACHO_DYNAMIC_NO_PIC_P)
518 #if defined (TARGET_TOC)
519 /* Create a new register for CSE opportunities. */
520 rtx hi_reg = (!can_create_pseudo_p () ? reg : gen_reg_rtx (Pmode));
521 emit_insn (gen_macho_high (hi_reg, orig));
522 emit_insn (gen_macho_low (reg, hi_reg, orig));
524 /* some other cpu -- writeme! */
531 #if defined (TARGET_TOC) || defined (HAVE_lo_sum)
532 rtx pic_base = machopic_function_base_sym ();
533 rtx offset = gen_pic_offset (orig, pic_base);
536 #if defined (TARGET_TOC) /* i.e., PowerPC */
537 rtx hi_sum_reg = (!can_create_pseudo_p ()
539 : gen_reg_rtx (Pmode));
543 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
544 gen_rtx_PLUS (Pmode, pic_offset_table_rtx,
545 gen_rtx_HIGH (Pmode, offset))));
546 emit_insn (gen_rtx_SET (Pmode, reg,
547 gen_rtx_LO_SUM (Pmode, hi_sum_reg, offset)));
551 #if defined (HAVE_lo_sum)
554 emit_insn (gen_rtx_SET (VOIDmode, reg,
555 gen_rtx_HIGH (Pmode, offset)));
556 emit_insn (gen_rtx_SET (VOIDmode, reg,
557 gen_rtx_LO_SUM (Pmode, reg, offset)));
558 emit_insn (gen_rtx_USE (VOIDmode, pic_offset_table_rtx));
560 orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg);
566 ptr_ref = (gen_rtx_SYMBOL_REF
568 machopic_indirection_name (orig, /*stub_p=*/false)));
570 SYMBOL_REF_DATA (ptr_ref) = SYMBOL_REF_DATA (orig);
572 ptr_ref = gen_const_mem (Pmode, ptr_ref);
573 machopic_define_symbol (ptr_ref);
577 else if (GET_CODE (orig) == CONST)
581 /* legitimize both operands of the PLUS */
582 if (GET_CODE (XEXP (orig, 0)) == PLUS)
584 base = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 0),
586 orig = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 1),
587 (base == reg ? 0 : reg));
592 if (MACHOPIC_PURE && GET_CODE (orig) == CONST_INT)
593 result = plus_constant (base, INTVAL (orig));
595 result = gen_rtx_PLUS (Pmode, base, orig);
597 if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM)
601 emit_move_insn (reg, result);
606 result = force_reg (GET_MODE (result), result);
613 else if (GET_CODE (orig) == MEM)
614 XEXP (ptr_ref, 0) = machopic_indirect_data_reference (XEXP (orig, 0), reg);
615 /* When the target is i386, this code prevents crashes due to the
616 compiler's ignorance on how to move the PIC base register to
617 other registers. (The reload phase sometimes introduces such
619 else if (GET_CODE (orig) == PLUS
620 && GET_CODE (XEXP (orig, 0)) == REG
621 && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM
623 /* Prevent the same register from being erroneously used
624 as both the base and index registers. */
625 && GET_CODE (XEXP (orig, 1)) == CONST
629 emit_move_insn (reg, XEXP (orig, 0));
630 XEXP (ptr_ref, 0) = reg;
635 /* Transform TARGET (a MEM), which is a function call target, to the
636 corresponding symbol_stub if necessary. Return a new MEM. */
639 machopic_indirect_call_target (rtx target)
641 if (GET_CODE (target) != MEM)
644 if (MACHOPIC_INDIRECT
645 && GET_CODE (XEXP (target, 0)) == SYMBOL_REF
646 && !(SYMBOL_REF_FLAGS (XEXP (target, 0))
647 & MACHO_SYMBOL_FLAG_DEFINED))
649 rtx sym_ref = XEXP (target, 0);
650 const char *stub_name = machopic_indirection_name (sym_ref,
652 enum machine_mode mode = GET_MODE (sym_ref);
654 XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name);
655 SYMBOL_REF_DATA (XEXP (target, 0)) = SYMBOL_REF_DATA (sym_ref);
656 MEM_READONLY_P (target) = 1;
657 MEM_NOTRAP_P (target) = 1;
664 machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg)
668 if (! MACHOPIC_INDIRECT)
671 /* First handle a simple SYMBOL_REF or LABEL_REF */
672 if (GET_CODE (orig) == LABEL_REF
673 || (GET_CODE (orig) == SYMBOL_REF
676 /* addr(foo) = &func+(foo-func) */
679 orig = machopic_indirect_data_reference (orig, reg);
681 if (GET_CODE (orig) == PLUS
682 && GET_CODE (XEXP (orig, 0)) == REG)
685 return force_reg (mode, orig);
687 emit_move_insn (reg, orig);
691 /* if dynamic-no-pic we don't have a pic base */
692 if (MACHO_DYNAMIC_NO_PIC_P)
695 pic_base = machopic_function_base_sym ();
697 if (GET_CODE (orig) == MEM)
701 gcc_assert (!reload_in_progress);
702 reg = gen_reg_rtx (Pmode);
706 if (MACHO_DYNAMIC_NO_PIC_P
707 && (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
708 || GET_CODE (XEXP (orig, 0)) == LABEL_REF))
710 #if defined (TARGET_TOC) /* ppc */
711 rtx temp_reg = (!can_create_pseudo_p ()
713 gen_reg_rtx (Pmode));
714 rtx asym = XEXP (orig, 0);
717 emit_insn (gen_macho_high (temp_reg, asym));
718 mem = gen_const_mem (GET_MODE (orig),
719 gen_rtx_LO_SUM (Pmode, temp_reg, asym));
720 emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
722 /* Some other CPU -- WriteMe! but right now there are no other
723 platforms that can use dynamic-no-pic */
729 if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
730 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
732 rtx offset = gen_pic_offset (XEXP (orig, 0), pic_base);
733 #if defined (TARGET_TOC) /* i.e., PowerPC */
734 /* Generating a new reg may expose opportunities for
735 common subexpression elimination. */
736 rtx hi_sum_reg = (!can_create_pseudo_p ()
738 : gen_reg_rtx (Pmode));
743 sum = gen_rtx_HIGH (Pmode, offset);
744 if (! MACHO_DYNAMIC_NO_PIC_P)
745 sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum);
747 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, sum));
749 mem = gen_const_mem (GET_MODE (orig),
750 gen_rtx_LO_SUM (Pmode,
751 hi_sum_reg, offset));
752 insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
753 set_unique_reg_note (insn, REG_EQUAL, pic_ref);
757 emit_insn (gen_rtx_USE (VOIDmode,
759 PIC_OFFSET_TABLE_REGNUM)));
761 emit_insn (gen_rtx_SET (VOIDmode, reg,
763 gen_rtx_CONST (Pmode,
765 emit_insn (gen_rtx_SET (VOIDmode, reg,
766 gen_rtx_LO_SUM (Pmode, reg,
767 gen_rtx_CONST (Pmode, offset))));
768 pic_ref = gen_rtx_PLUS (Pmode,
769 pic_offset_table_rtx, reg);
773 #endif /* HAVE_lo_sum */
775 rtx pic = pic_offset_table_rtx;
776 if (GET_CODE (pic) != REG)
778 emit_move_insn (reg, pic);
782 emit_insn (gen_rtx_USE (VOIDmode,
784 PIC_OFFSET_TABLE_REGNUM)));
787 if (reload_in_progress)
788 df_set_regs_ever_live (REGNO (pic), true);
789 pic_ref = gen_rtx_PLUS (Pmode, pic,
790 gen_pic_offset (XEXP (orig, 0),
794 #if !defined (TARGET_TOC)
795 emit_move_insn (reg, pic_ref);
796 pic_ref = gen_const_mem (GET_MODE (orig), reg);
803 if (GET_CODE (orig) == SYMBOL_REF
804 || GET_CODE (orig) == LABEL_REF)
806 rtx offset = gen_pic_offset (orig, pic_base);
807 #if defined (TARGET_TOC) /* i.e., PowerPC */
812 gcc_assert (!reload_in_progress);
813 reg = gen_reg_rtx (Pmode);
818 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
819 (MACHO_DYNAMIC_NO_PIC_P)
820 ? gen_rtx_HIGH (Pmode, offset)
821 : gen_rtx_PLUS (Pmode,
822 pic_offset_table_rtx,
825 emit_insn (gen_rtx_SET (VOIDmode, reg,
826 gen_rtx_LO_SUM (Pmode,
827 hi_sum_reg, offset)));
830 emit_insn (gen_rtx_SET (VOIDmode, reg,
831 gen_rtx_HIGH (Pmode, offset)));
832 emit_insn (gen_rtx_SET (VOIDmode, reg,
833 gen_rtx_LO_SUM (Pmode, reg, offset)));
834 pic_ref = gen_rtx_PLUS (Pmode,
835 pic_offset_table_rtx, reg);
839 #endif /* HAVE_lo_sum */
842 || GET_CODE (orig) == SUBREG)
848 rtx pic = pic_offset_table_rtx;
849 if (GET_CODE (pic) != REG)
851 emit_move_insn (reg, pic);
855 emit_insn (gen_rtx_USE (VOIDmode,
856 pic_offset_table_rtx));
858 if (reload_in_progress)
859 df_set_regs_ever_live (REGNO (pic), true);
860 pic_ref = gen_rtx_PLUS (Pmode,
862 gen_pic_offset (orig, pic_base));
867 if (GET_CODE (pic_ref) != REG)
871 emit_move_insn (reg, pic_ref);
876 return force_reg (mode, pic_ref);
885 else if (GET_CODE (orig) == SYMBOL_REF)
888 else if (GET_CODE (orig) == PLUS
889 && (GET_CODE (XEXP (orig, 0)) == MEM
890 || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
891 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
892 && XEXP (orig, 0) != pic_offset_table_rtx
893 && GET_CODE (XEXP (orig, 1)) != REG)
897 int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM);
899 base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
900 orig = machopic_legitimize_pic_address (XEXP (orig, 1),
901 Pmode, (base == reg ? 0 : reg));
902 if (GET_CODE (orig) == CONST_INT)
904 pic_ref = plus_constant (base, INTVAL (orig));
908 pic_ref = gen_rtx_PLUS (Pmode, base, orig);
910 if (reg && is_complex)
912 emit_move_insn (reg, pic_ref);
915 /* Likewise, should we set special REG_NOTEs here? */
918 else if (GET_CODE (orig) == CONST)
920 return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
923 else if (GET_CODE (orig) == MEM
924 && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF)
926 rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
927 addr = replace_equiv_address (orig, addr);
928 emit_move_insn (reg, addr);
935 /* Output the stub or non-lazy pointer in *SLOT, if it has been used.
936 DATA is the FILE* for assembly output. Called from
940 machopic_output_indirection (void **slot, void *data)
942 machopic_indirection *p = *((machopic_indirection **) slot);
943 FILE *asm_out_file = (FILE *) data;
945 const char *sym_name;
946 const char *ptr_name;
952 sym_name = XSTR (symbol, 0);
953 ptr_name = p->ptr_name;
961 id = maybe_get_identifier (sym_name);
966 while (IDENTIFIER_TRANSPARENT_ALIAS (id))
967 id = TREE_CHAIN (id);
969 sym_name = IDENTIFIER_POINTER (id);
972 sym = alloca (strlen (sym_name) + 2);
973 if (sym_name[0] == '*' || sym_name[0] == '&')
974 strcpy (sym, sym_name + 1);
975 else if (sym_name[0] == '-' || sym_name[0] == '+')
976 strcpy (sym, sym_name);
978 sprintf (sym, "%s%s", user_label_prefix, sym_name);
980 stub = alloca (strlen (ptr_name) + 2);
981 if (ptr_name[0] == '*' || ptr_name[0] == '&')
982 strcpy (stub, ptr_name + 1);
984 sprintf (stub, "%s%s", user_label_prefix, ptr_name);
986 machopic_output_stub (asm_out_file, sym, stub);
988 else if (! indirect_data (symbol)
989 && (machopic_symbol_defined_p (symbol)
990 || SYMBOL_REF_LOCAL_P (symbol)))
992 switch_to_section (data_section);
993 assemble_align (GET_MODE_ALIGNMENT (Pmode));
994 assemble_label (ptr_name);
995 assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name),
996 GET_MODE_SIZE (Pmode),
997 GET_MODE_ALIGNMENT (Pmode), 1);
1001 rtx init = const0_rtx;
1003 switch_to_section (darwin_sections[machopic_nl_symbol_ptr_section]);
1004 assemble_name (asm_out_file, ptr_name);
1005 fprintf (asm_out_file, ":\n");
1007 fprintf (asm_out_file, "\t.indirect_symbol ");
1008 assemble_name (asm_out_file, sym_name);
1009 fprintf (asm_out_file, "\n");
1011 /* Variables that are marked with MACHO_SYMBOL_STATIC need to
1012 have their symbol name instead of 0 in the second entry of
1013 the non-lazy symbol pointer data structure when they are
1014 defined. This allows the runtime to rebind newer instances
1015 of the translation unit with the original instance of the
1018 if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC)
1019 && machopic_symbol_defined_p (symbol))
1020 init = gen_rtx_SYMBOL_REF (Pmode, sym_name);
1022 assemble_integer (init, GET_MODE_SIZE (Pmode),
1023 GET_MODE_ALIGNMENT (Pmode), 1);
1030 machopic_finish (FILE *asm_out_file)
1032 if (machopic_indirections)
1033 htab_traverse_noresize (machopic_indirections,
1034 machopic_output_indirection,
1039 machopic_operand_p (rtx op)
1041 if (MACHOPIC_JUST_INDIRECT)
1043 while (GET_CODE (op) == CONST)
1046 if (GET_CODE (op) == SYMBOL_REF)
1047 return machopic_symbol_defined_p (op);
1052 while (GET_CODE (op) == CONST)
1055 if (GET_CODE (op) == MINUS
1056 && GET_CODE (XEXP (op, 0)) == SYMBOL_REF
1057 && GET_CODE (XEXP (op, 1)) == SYMBOL_REF
1058 && machopic_symbol_defined_p (XEXP (op, 0))
1059 && machopic_symbol_defined_p (XEXP (op, 1)))
1065 /* This function records whether a given name corresponds to a defined
1066 or undefined function or variable, for machopic_classify_ident to
1070 darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
1074 /* Do the standard encoding things first. */
1075 default_encode_section_info (decl, rtl, first);
1077 if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
1080 sym_ref = XEXP (rtl, 0);
1081 if (TREE_CODE (decl) == VAR_DECL)
1082 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE;
1084 if (!DECL_EXTERNAL (decl)
1085 && (!TREE_PUBLIC (decl) || !DECL_WEAK (decl))
1086 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))
1087 && ((TREE_STATIC (decl)
1088 && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl)))
1089 || (!DECL_COMMON (decl) && DECL_INITIAL (decl)
1090 && DECL_INITIAL (decl) != error_mark_node)))
1091 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
1093 if (! TREE_PUBLIC (decl))
1094 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC;
1098 darwin_mark_decl_preserved (const char *name)
1100 fprintf (asm_out_file, ".no_dead_strip ");
1101 assemble_name (asm_out_file, name);
1102 fputc ('\n', asm_out_file);
1106 darwin_text_section (int reloc, int weak)
1110 ? darwin_sections[text_unlikely_coal_section]
1111 : unlikely_text_section ());
1114 ? darwin_sections[text_coal_section]
1119 darwin_rodata_section (int weak)
1122 ? darwin_sections[const_coal_section]
1123 : darwin_sections[const_section]);
1127 darwin_mergeable_string_section (tree exp,
1128 unsigned HOST_WIDE_INT align)
1130 if (flag_merge_constants
1131 && TREE_CODE (exp) == STRING_CST
1132 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE
1134 && ((size_t) TREE_STRING_LENGTH (exp)
1135 == strlen (TREE_STRING_POINTER (exp)) + 1))
1136 return darwin_sections[cstring_section];
1138 return readonly_data_section;
1141 #ifndef HAVE_GAS_LITERAL16
1142 #define HAVE_GAS_LITERAL16 0
1146 darwin_mergeable_constant_section (tree exp,
1147 unsigned HOST_WIDE_INT align)
1149 enum machine_mode mode = DECL_MODE (exp);
1150 unsigned int modesize = GET_MODE_BITSIZE (mode);
1152 if (flag_merge_constants
1155 && modesize <= align
1158 && (align & (align -1)) == 0)
1160 tree size = TYPE_SIZE_UNIT (TREE_TYPE (exp));
1162 if (TREE_CODE (size) == INTEGER_CST
1163 && TREE_INT_CST_LOW (size) == 4
1164 && TREE_INT_CST_HIGH (size) == 0)
1165 return darwin_sections[literal4_section];
1166 else if (TREE_CODE (size) == INTEGER_CST
1167 && TREE_INT_CST_LOW (size) == 8
1168 && TREE_INT_CST_HIGH (size) == 0)
1169 return darwin_sections[literal8_section];
1170 else if (HAVE_GAS_LITERAL16
1172 && TREE_CODE (size) == INTEGER_CST
1173 && TREE_INT_CST_LOW (size) == 16
1174 && TREE_INT_CST_HIGH (size) == 0)
1175 return darwin_sections[literal16_section];
1177 return readonly_data_section;
1180 return readonly_data_section;
1184 machopic_reloc_rw_mask (void)
1186 return MACHOPIC_INDIRECT ? 3 : 0;
1190 machopic_select_section (tree decl,
1192 unsigned HOST_WIDE_INT align)
1194 bool weak = (DECL_P (decl)
1196 && (lookup_attribute ("weak", DECL_ATTRIBUTES (decl))
1197 || ! lookup_attribute ("weak_import",
1198 DECL_ATTRIBUTES (decl))));
1199 section *base_section;
1201 switch (categorize_decl_for_section (decl, reloc))
1204 base_section = darwin_text_section (reloc, weak);
1208 case SECCAT_SRODATA:
1209 base_section = darwin_rodata_section (weak);
1212 case SECCAT_RODATA_MERGE_STR:
1213 base_section = darwin_mergeable_string_section (decl, align);
1216 case SECCAT_RODATA_MERGE_STR_INIT:
1217 base_section = darwin_mergeable_string_section (DECL_INITIAL (decl), align);
1220 case SECCAT_RODATA_MERGE_CONST:
1221 base_section = darwin_mergeable_constant_section (decl, align);
1225 case SECCAT_DATA_REL:
1226 case SECCAT_DATA_REL_LOCAL:
1227 case SECCAT_DATA_REL_RO:
1228 case SECCAT_DATA_REL_RO_LOCAL:
1234 if (TREE_READONLY (decl) || TREE_CONSTANT (decl))
1235 base_section = weak ? darwin_sections[const_data_coal_section]
1236 : darwin_sections[const_data_section];
1238 base_section = weak ? darwin_sections[data_coal_section] : data_section;
1245 /* Darwin weird special cases. */
1246 if (TREE_CODE (decl) == CONSTRUCTOR
1248 && TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
1249 && TYPE_NAME (TREE_TYPE (decl)))
1251 tree name = TYPE_NAME (TREE_TYPE (decl));
1252 if (TREE_CODE (name) == TYPE_DECL)
1253 name = DECL_NAME (name);
1255 if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_ObjCString"))
1257 if (flag_next_runtime)
1258 return darwin_sections[objc_constant_string_object_section];
1260 return darwin_sections[objc_string_object_section];
1263 return base_section;
1265 else if (TREE_CODE (decl) == VAR_DECL
1267 && TREE_CODE (DECL_NAME (decl)) == IDENTIFIER_NODE
1268 && IDENTIFIER_POINTER (DECL_NAME (decl))
1269 && !strncmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "_OBJC_", 6))
1271 const char *name = IDENTIFIER_POINTER (DECL_NAME (decl));
1273 if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20))
1274 return darwin_sections[objc_cls_meth_section];
1275 else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23))
1276 return darwin_sections[objc_inst_meth_section];
1277 else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20))
1278 return darwin_sections[objc_cat_cls_meth_section];
1279 else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23))
1280 return darwin_sections[objc_cat_inst_meth_section];
1281 else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22))
1282 return darwin_sections[objc_class_vars_section];
1283 else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25))
1284 return darwin_sections[objc_instance_vars_section];
1285 else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22))
1286 return darwin_sections[objc_cat_cls_meth_section];
1287 else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17))
1288 return darwin_sections[objc_class_names_section];
1289 else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20))
1290 return darwin_sections[objc_meth_var_names_section];
1291 else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20))
1292 return darwin_sections[objc_meth_var_types_section];
1293 else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22))
1294 return darwin_sections[objc_cls_refs_section];
1295 else if (!strncmp (name, "_OBJC_CLASS_", 12))
1296 return darwin_sections[objc_class_section];
1297 else if (!strncmp (name, "_OBJC_METACLASS_", 16))
1298 return darwin_sections[objc_meta_class_section];
1299 else if (!strncmp (name, "_OBJC_CATEGORY_", 15))
1300 return darwin_sections[objc_category_section];
1301 else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25))
1302 return darwin_sections[objc_selector_refs_section];
1303 else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20))
1304 return darwin_sections[objc_selector_fixup_section];
1305 else if (!strncmp (name, "_OBJC_SYMBOLS", 13))
1306 return darwin_sections[objc_symbols_section];
1307 else if (!strncmp (name, "_OBJC_MODULES", 13))
1308 return darwin_sections[objc_module_info_section];
1309 else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16))
1310 return darwin_sections[objc_image_info_section];
1311 else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32))
1312 return darwin_sections[objc_cat_inst_meth_section];
1313 else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29))
1314 return darwin_sections[objc_cat_cls_meth_section];
1315 else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20))
1316 return darwin_sections[objc_cat_cls_meth_section];
1317 else if (!strncmp (name, "_OBJC_PROTOCOL_", 15))
1318 return darwin_sections[objc_protocol_section];
1320 return base_section;
1323 return base_section;
1326 /* This can be called with address expressions as "rtx".
1327 They must go in "const". */
1330 machopic_select_rtx_section (enum machine_mode mode, rtx x,
1331 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
1333 if (GET_MODE_SIZE (mode) == 8
1334 && (GET_CODE (x) == CONST_INT
1335 || GET_CODE (x) == CONST_DOUBLE))
1336 return darwin_sections[literal8_section];
1337 else if (GET_MODE_SIZE (mode) == 4
1338 && (GET_CODE (x) == CONST_INT
1339 || GET_CODE (x) == CONST_DOUBLE))
1340 return darwin_sections[literal4_section];
1341 else if (HAVE_GAS_LITERAL16
1343 && GET_MODE_SIZE (mode) == 16
1344 && (GET_CODE (x) == CONST_INT
1345 || GET_CODE (x) == CONST_DOUBLE
1346 || GET_CODE (x) == CONST_VECTOR))
1347 return darwin_sections[literal16_section];
1348 else if (MACHOPIC_INDIRECT
1349 && (GET_CODE (x) == SYMBOL_REF
1350 || GET_CODE (x) == CONST
1351 || GET_CODE (x) == LABEL_REF))
1352 return darwin_sections[const_data_section];
1354 return darwin_sections[const_section];
1358 machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1360 if (MACHOPIC_INDIRECT)
1361 switch_to_section (darwin_sections[mod_init_section]);
1363 switch_to_section (darwin_sections[constructor_section]);
1364 assemble_align (POINTER_SIZE);
1365 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1367 if (! MACHOPIC_INDIRECT)
1368 fprintf (asm_out_file, ".reference .constructors_used\n");
1372 machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1374 if (MACHOPIC_INDIRECT)
1375 switch_to_section (darwin_sections[mod_term_section]);
1377 switch_to_section (darwin_sections[destructor_section]);
1378 assemble_align (POINTER_SIZE);
1379 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1381 if (! MACHOPIC_INDIRECT)
1382 fprintf (asm_out_file, ".reference .destructors_used\n");
1386 darwin_globalize_label (FILE *stream, const char *name)
1388 if (!!strncmp (name, "_OBJC_", 6))
1389 default_globalize_label (stream, name);
1393 darwin_asm_named_section (const char *name,
1394 unsigned int flags ATTRIBUTE_UNUSED,
1395 tree decl ATTRIBUTE_UNUSED)
1397 fprintf (asm_out_file, "\t.section %s\n", name);
1401 darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED)
1403 /* Darwin does not use unique sections. */
1406 /* Handle __attribute__ ((apple_kext_compatibility)).
1407 This only applies to darwin kexts for 2.95 compatibility -- it shrinks the
1408 vtable for classes with this attribute (and their descendants) by not
1409 outputting the new 3.0 nondeleting destructor. This means that such
1410 objects CANNOT be allocated on the stack or as globals UNLESS they have
1411 a completely empty `operator delete'.
1412 Luckily, this fits in with the Darwin kext model.
1414 This attribute also disables gcc3's potential overlaying of derived
1415 class data members on the padding at the end of the base class. */
1418 darwin_handle_kext_attribute (tree *node, tree name,
1419 tree args ATTRIBUTE_UNUSED,
1420 int flags ATTRIBUTE_UNUSED,
1423 /* APPLE KEXT stuff -- only applies with pure static C++ code. */
1424 if (! TARGET_KEXTABI)
1426 warning (0, "%<%s%> 2.95 vtable-compatibility attribute applies "
1427 "only when compiling a kext", IDENTIFIER_POINTER (name));
1429 *no_add_attrs = true;
1431 else if (TREE_CODE (*node) != RECORD_TYPE)
1433 warning (0, "%<%s%> 2.95 vtable-compatibility attribute applies "
1434 "only to C++ classes", IDENTIFIER_POINTER (name));
1436 *no_add_attrs = true;
1442 /* Handle a "weak_import" attribute; arguments as in
1443 struct attribute_spec.handler. */
1446 darwin_handle_weak_import_attribute (tree *node, tree name,
1447 tree ARG_UNUSED (args),
1448 int ARG_UNUSED (flags),
1449 bool * no_add_attrs)
1451 if (TREE_CODE (*node) != FUNCTION_DECL && TREE_CODE (*node) != VAR_DECL)
1453 warning (OPT_Wattributes, "%qs attribute ignored",
1454 IDENTIFIER_POINTER (name));
1455 *no_add_attrs = true;
1458 declare_weak (*node);
1464 no_dead_strip (FILE *file, const char *lab)
1466 fprintf (file, ".no_dead_strip %s\n", lab);
1469 /* Emit a label for an FDE, making it global and/or weak if appropriate.
1470 The third parameter is nonzero if this is for exception handling.
1471 The fourth parameter is nonzero if this is just a placeholder for an
1472 FDE that we are omitting. */
1475 darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty)
1481 if (DECL_ASSEMBLER_NAME_SET_P (decl))
1482 base = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1484 base = IDENTIFIER_POINTER (DECL_NAME (decl));
1486 base = targetm.strip_name_encoding (base);
1487 need_quotes = name_needs_quotes (base);
1492 lab = concat (need_quotes ? "\"" : "", user_label_prefix, base, ".eh",
1493 need_quotes ? "\"" : "", NULL);
1495 if (TREE_PUBLIC (decl))
1496 fprintf (file, "\t%s %s\n",
1497 (DECL_VISIBILITY (decl) != VISIBILITY_HIDDEN
1499 : ".private_extern"),
1502 if (DECL_WEAK (decl))
1503 fprintf (file, "\t.weak_definition %s\n", lab);
1507 fprintf (file, "%s = 0\n", lab);
1509 /* Mark the absolute .eh and .eh1 style labels as needed to
1510 ensure that we don't dead code strip them and keep such
1511 labels from another instantiation point until we can fix this
1512 properly with group comdat support. */
1513 no_dead_strip (file, lab);
1516 fprintf (file, "%s:\n", lab);
1521 static GTY(()) unsigned long except_table_label_num;
1524 darwin_emit_except_table_label (FILE *file)
1526 char section_start_label[30];
1528 ASM_GENERATE_INTERNAL_LABEL (section_start_label, "GCC_except_table",
1529 except_table_label_num++);
1530 ASM_OUTPUT_LABEL (file, section_start_label);
1532 /* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */
1535 darwin_non_lazy_pcrel (FILE *file, rtx addr)
1537 const char *nlp_name;
1539 gcc_assert (GET_CODE (addr) == SYMBOL_REF);
1541 nlp_name = machopic_indirection_name (addr, /*stub_p=*/false);
1542 fputs ("\t.long\t", file);
1543 ASM_OUTPUT_LABELREF (file, nlp_name);
1547 /* Emit an assembler directive to set visibility for a symbol. The
1548 only supported visibilities are VISIBILITY_DEFAULT and
1549 VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private
1550 extern". There is no MACH-O equivalent of ELF's
1551 VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */
1554 darwin_assemble_visibility (tree decl, int vis)
1556 if (vis == VISIBILITY_DEFAULT)
1558 else if (vis == VISIBILITY_HIDDEN)
1560 fputs ("\t.private_extern ", asm_out_file);
1561 assemble_name (asm_out_file,
1562 (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))));
1563 fputs ("\n", asm_out_file);
1566 warning (OPT_Wattributes, "internal and protected visibility attributes "
1567 "not supported in this configuration; ignored");
1570 /* Output a difference of two labels that will be an assembly time
1571 constant if the two labels are local. (.long lab1-lab2 will be
1572 very different if lab1 is at the boundary between two sections; it
1573 will be relocated according to the second section, not the first,
1574 so one ends up with a difference between labels in different
1575 sections, which is bad in the dwarf2 eh context for instance.) */
1577 static int darwin_dwarf_label_counter;
1580 darwin_asm_output_dwarf_delta (FILE *file, int size,
1581 const char *lab1, const char *lab2)
1583 int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L'
1584 && lab2[0] == '*' && lab2[1] == 'L');
1585 const char *directive = (size == 8 ? ".quad" : ".long");
1588 fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter);
1590 fprintf (file, "\t%s\t", directive);
1591 assemble_name_raw (file, lab1);
1592 fprintf (file, "-");
1593 assemble_name_raw (file, lab2);
1595 fprintf (file, "\n\t%s L$set$%d", directive, darwin_dwarf_label_counter++);
1598 /* Output labels for the start of the DWARF sections if necessary. */
1600 darwin_file_start (void)
1602 if (write_symbols == DWARF2_DEBUG)
1604 static const char * const debugnames[] =
1606 DEBUG_FRAME_SECTION,
1608 DEBUG_ABBREV_SECTION,
1609 DEBUG_ARANGES_SECTION,
1610 DEBUG_MACINFO_SECTION,
1613 DEBUG_PUBNAMES_SECTION,
1614 DEBUG_PUBTYPES_SECTION,
1616 DEBUG_RANGES_SECTION
1620 for (i = 0; i < ARRAY_SIZE (debugnames); i++)
1624 switch_to_section (get_section (debugnames[i], SECTION_DEBUG, NULL));
1626 gcc_assert (strncmp (debugnames[i], "__DWARF,", 8) == 0);
1627 gcc_assert (strchr (debugnames[i] + 8, ','));
1629 namelen = strchr (debugnames[i] + 8, ',') - (debugnames[i] + 8);
1630 fprintf (asm_out_file, "Lsection%.*s:\n", namelen, debugnames[i] + 8);
1635 /* Output an offset in a DWARF section on Darwin. On Darwin, DWARF section
1636 offsets are not represented using relocs in .o files; either the
1637 section never leaves the .o file, or the linker or other tool is
1638 responsible for parsing the DWARF and updating the offsets. */
1641 darwin_asm_output_dwarf_offset (FILE *file, int size, const char * lab,
1647 gcc_assert (base->common.flags & SECTION_NAMED);
1648 gcc_assert (strncmp (base->named.name, "__DWARF,", 8) == 0);
1649 gcc_assert (strchr (base->named.name + 8, ','));
1651 namelen = strchr (base->named.name + 8, ',') - (base->named.name + 8);
1652 sprintf (sname, "*Lsection%.*s", namelen, base->named.name + 8);
1653 darwin_asm_output_dwarf_delta (file, size, lab, sname);
1657 darwin_file_end (void)
1659 machopic_finish (asm_out_file);
1660 if (strcmp (lang_hooks.name, "GNU C++") == 0)
1662 switch_to_section (darwin_sections[constructor_section]);
1663 switch_to_section (darwin_sections[destructor_section]);
1664 ASM_OUTPUT_ALIGN (asm_out_file, 1);
1666 fprintf (asm_out_file, "\t.subsections_via_symbols\n");
1669 /* TODO: Add a language hook for identifying if a decl is a vtable. */
1670 #define DARWIN_VTABLE_P(DECL) 0
1672 /* Cross-module name binding. Darwin does not support overriding
1673 functions at dynamic-link time, except for vtables in kexts. */
1676 darwin_binds_local_p (tree decl)
1678 return default_binds_local_p_1 (decl,
1679 TARGET_KEXTABI && DARWIN_VTABLE_P (decl));
1683 /* See TARGET_ASM_OUTPUT_ANCHOR for why we can't do this yet. */
1684 /* The Darwin's implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
1685 anchor relative to ".", the current section position. We cannot use
1686 the default one because ASM_OUTPUT_DEF is wrong for Darwin. */
1689 darwin_asm_output_anchor (rtx symbol)
1691 fprintf (asm_out_file, "\t.set\t");
1692 assemble_name (asm_out_file, XSTR (symbol, 0));
1693 fprintf (asm_out_file, ", . + " HOST_WIDE_INT_PRINT_DEC "\n",
1694 SYMBOL_REF_BLOCK_OFFSET (symbol));
1698 /* Set the darwin specific attributes on TYPE. */
1700 darwin_set_default_type_attributes (tree type)
1702 if (darwin_ms_struct
1703 && TREE_CODE (type) == RECORD_TYPE)
1704 TYPE_ATTRIBUTES (type) = tree_cons (get_identifier ("ms_struct"),
1706 TYPE_ATTRIBUTES (type));
1709 /* True, iff we're generating code for loadable kernel extensions. */
1712 darwin_kextabi_p (void) {
1713 return flag_apple_kext;
1717 darwin_override_options (void)
1719 if (flag_mkernel || flag_apple_kext)
1721 /* -mkernel implies -fapple-kext for C++ */
1722 if (strcmp (lang_hooks.name, "GNU C++") == 0)
1723 flag_apple_kext = 1;
1727 /* No EH in kexts. */
1728 flag_exceptions = 0;
1729 /* No -fnon-call-exceptions data in kexts. */
1730 flag_non_call_exceptions = 0;
1732 if (flag_var_tracking
1733 && strverscmp (darwin_macosx_version_min, "10.5") >= 0
1734 && debug_info_level >= DINFO_LEVEL_NORMAL
1735 && debug_hooks->var_location != do_nothing_debug_hooks.var_location)
1736 flag_var_tracking_uninit = 1;
1739 #include "gt-darwin.h"