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"
50 /* Darwin supports a feature called fix-and-continue, which is used
51 for rapid turn around debugging. When code is compiled with the
52 -mfix-and-continue flag, two changes are made to the generated code
53 that allow the system to do things that it would normally not be
54 able to do easily. These changes allow gdb to load in
55 recompilation of a translation unit that has been changed into a
56 running program and replace existing functions and methods of that
57 translation unit with versions of those functions and methods
58 from the newly compiled translation unit. The new functions access
59 the existing static symbols from the old translation unit, if the
60 symbol existed in the unit to be replaced, and from the new
61 translation unit, otherwise.
63 The changes are to insert 5 nops at the beginning of all functions
64 and to use indirection to get at static symbols. The 5 nops
65 are required by consumers of the generated code. Currently, gdb
66 uses this to patch in a jump to the overriding function, this
67 allows all uses of the old name to forward to the replacement,
68 including existing function pointers and virtual methods. See
69 rs6000_emit_prologue for the code that handles the nop insertions.
71 The added indirection allows gdb to redirect accesses to static
72 symbols from the newly loaded translation unit to the existing
73 symbol, if any. @code{static} symbols are special and are handled by
74 setting the second word in the .non_lazy_symbol_pointer data
75 structure to symbol. See indirect_data for the code that handles
76 the extra indirection, and machopic_output_indirection and its use
77 of MACHO_SYMBOL_STATIC for the code that handles @code{static}
78 symbol indirection. */
81 section * darwin_sections[NUM_DARWIN_SECTIONS];
83 /* True if we're setting __attribute__ ((ms_struct)). */
84 int darwin_ms_struct = false;
86 /* A get_unnamed_section callback used to switch to an ObjC section.
87 DIRECTIVE is as for output_section_asm_op. */
90 output_objc_section_asm_op (const void *directive)
92 static bool been_here = false;
96 static const enum darwin_section_enum tomark[] =
98 /* written, cold -> hot */
99 objc_cat_cls_meth_section,
100 objc_cat_inst_meth_section,
101 objc_string_object_section,
102 objc_constant_string_object_section,
103 objc_selector_refs_section,
104 objc_selector_fixup_section,
105 objc_cls_refs_section,
107 objc_meta_class_section,
108 /* shared, hot -> cold */
109 objc_cls_meth_section,
110 objc_inst_meth_section,
111 objc_protocol_section,
112 objc_class_names_section,
113 objc_meth_var_types_section,
114 objc_meth_var_names_section,
115 objc_category_section,
116 objc_class_vars_section,
117 objc_instance_vars_section,
118 objc_module_info_section,
124 for (i = 0; i < ARRAY_SIZE (tomark); i++)
125 switch_to_section (darwin_sections[tomark[i]]);
127 output_section_asm_op (directive);
130 /* Implement TARGET_ASM_INIT_SECTIONS. */
133 darwin_init_sections (void)
135 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) \
136 darwin_sections[NAME] = \
137 get_unnamed_section (FLAGS, (OBJC \
138 ? output_objc_section_asm_op \
139 : output_section_asm_op), \
141 #include "config/darwin-sections.def"
144 readonly_data_section = darwin_sections[const_section];
145 exception_section = darwin_sections[darwin_exception_section];
146 eh_frame_section = darwin_sections[darwin_eh_frame_section];
150 name_needs_quotes (const char *name)
153 while ((c = *name++) != '\0')
154 if (! ISIDNUM (c) && c != '.' && c != '$')
159 /* Return true if SYM_REF can be used without an indirection. */
161 machopic_symbol_defined_p (rtx sym_ref)
163 if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED)
166 /* If a symbol references local and is not an extern to this
167 file, then the symbol might be able to declared as defined. */
168 if (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref))
170 /* If the symbol references a variable and the variable is a
171 common symbol, then this symbol is not defined. */
172 if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_VARIABLE)
174 tree decl = SYMBOL_REF_DECL (sym_ref);
177 if (DECL_COMMON (decl))
185 /* This module assumes that (const (symbol_ref "foo")) is a legal pic
186 reference, which will not be changed. */
188 enum machopic_addr_class
189 machopic_classify_symbol (rtx sym_ref)
194 flags = SYMBOL_REF_FLAGS (sym_ref);
195 function_p = SYMBOL_REF_FUNCTION_P (sym_ref);
196 if (machopic_symbol_defined_p (sym_ref))
198 ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA);
201 ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA);
204 #ifndef TARGET_FIX_AND_CONTINUE
205 #define TARGET_FIX_AND_CONTINUE 0
208 /* Indicate when fix-and-continue style code generation is being used
209 and when a reference to data should be indirected so that it can be
210 rebound in a new translation unit to reference the original instance
211 of that data. Symbol names that are for code generation local to
212 the translation unit are bound to the new translation unit;
213 currently this means symbols that begin with L or _OBJC_;
214 otherwise, we indicate that an indirect reference should be made to
215 permit the runtime to rebind new instances of the translation unit
216 to the original instance of the data. */
219 indirect_data (rtx sym_ref)
224 /* If we aren't generating fix-and-continue code, don't do anything
226 if (TARGET_FIX_AND_CONTINUE == 0)
229 /* Otherwise, all symbol except symbols that begin with L or _OBJC_
230 are indirected. Symbols that begin with L and _OBJC_ are always
231 bound to the current translation unit as they are used for
232 generated local data of the translation unit. */
234 name = XSTR (sym_ref, 0);
236 lprefix = (((name[0] == '*' || name[0] == '&')
237 && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L')))
238 || (strncmp (name, "_OBJC_", 6) == 0));
245 machopic_data_defined_p (rtx sym_ref)
247 if (indirect_data (sym_ref))
250 switch (machopic_classify_symbol (sym_ref))
252 case MACHOPIC_DEFINED_DATA:
253 case MACHOPIC_DEFINED_FUNCTION:
261 machopic_define_symbol (rtx mem)
265 gcc_assert (GET_CODE (mem) == MEM);
266 sym_ref = XEXP (mem, 0);
267 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
270 static GTY(()) char * function_base;
273 machopic_function_base_name (void)
275 /* if dynamic-no-pic is on, we should not get here */
276 gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);
278 if (function_base == NULL)
280 (char *) ggc_alloc_string ("<pic base>", sizeof ("<pic base>"));
282 current_function_uses_pic_offset_table = 1;
284 return function_base;
287 /* Return a SYMBOL_REF for the PIC function base. */
290 machopic_function_base_sym (void)
294 sym_ref = gen_rtx_SYMBOL_REF (Pmode, machopic_function_base_name ());
295 SYMBOL_REF_FLAGS (sym_ref)
296 |= (MACHO_SYMBOL_FLAG_VARIABLE | MACHO_SYMBOL_FLAG_DEFINED);
300 /* Return either ORIG or (const:P (minus:P ORIG PIC_BASE)), depending
301 on whether pic_base is NULL or not. */
303 gen_pic_offset (rtx orig, rtx pic_base)
308 return gen_rtx_CONST (Pmode, gen_rtx_MINUS (Pmode, orig, pic_base));
311 static GTY(()) const char * function_base_func_name;
312 static GTY(()) int current_pic_label_num;
315 machopic_output_function_base_name (FILE *file)
317 const char *current_name;
319 /* If dynamic-no-pic is on, we should not get here. */
320 gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);
322 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
323 if (function_base_func_name != current_name)
325 ++current_pic_label_num;
326 function_base_func_name = current_name;
328 fprintf (file, "\"L%011d$pb\"", current_pic_label_num);
331 /* The suffix attached to non-lazy pointer symbols. */
332 #define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr"
333 /* The suffix attached to stub symbols. */
334 #define STUB_SUFFIX "$stub"
336 typedef struct machopic_indirection GTY (())
338 /* The SYMBOL_REF for the entity referenced. */
340 /* The name of the stub or non-lazy pointer. */
341 const char * ptr_name;
342 /* True iff this entry is for a stub (as opposed to a non-lazy
345 /* True iff this stub or pointer pointer has been referenced. */
347 } machopic_indirection;
349 /* A table mapping stub names and non-lazy pointer names to
350 SYMBOL_REFs for the stubbed-to and pointed-to entities. */
352 static GTY ((param_is (struct machopic_indirection))) htab_t
353 machopic_indirections;
355 /* Return a hash value for a SLOT in the indirections hash table. */
358 machopic_indirection_hash (const void *slot)
360 const machopic_indirection *p = (const machopic_indirection *) slot;
361 return htab_hash_string (p->ptr_name);
364 /* Returns true if the KEY is the same as that associated with
368 machopic_indirection_eq (const void *slot, const void *key)
370 return strcmp (((const machopic_indirection *) slot)->ptr_name, key) == 0;
373 /* Return the name of the non-lazy pointer (if STUB_P is false) or
374 stub (if STUB_B is true) corresponding to the given name. */
377 machopic_indirection_name (rtx sym_ref, bool stub_p)
380 const char *name = XSTR (sym_ref, 0);
381 size_t namelen = strlen (name);
382 machopic_indirection *p;
384 bool saw_star = false;
387 const char *prefix = user_label_prefix;
388 const char *quote = "";
391 id = maybe_get_identifier (name);
396 while (IDENTIFIER_TRANSPARENT_ALIAS (id))
397 id = TREE_CHAIN (id);
400 name = IDENTIFIER_POINTER (id);
401 namelen = strlen (name);
413 needs_quotes = name_needs_quotes (name);
420 suffix = STUB_SUFFIX;
422 suffix = NON_LAZY_POINTER_SUFFIX;
424 buffer = alloca (strlen ("&L")
431 /* Construct the name of the non-lazy pointer or stub. */
432 sprintf (buffer, "&%sL%s%s%s%s", quote, prefix, name, suffix, quote);
434 if (!machopic_indirections)
435 machopic_indirections = htab_create_ggc (37,
436 machopic_indirection_hash,
437 machopic_indirection_eq,
440 slot = htab_find_slot_with_hash (machopic_indirections, buffer,
441 htab_hash_string (buffer), INSERT);
444 p = (machopic_indirection *) *slot;
448 p = (machopic_indirection *) ggc_alloc (sizeof (machopic_indirection));
450 p->ptr_name = xstrdup (buffer);
459 /* Return the name of the stub for the mcount function. */
462 machopic_mcount_stub_name (void)
464 rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount");
465 return machopic_indirection_name (symbol, /*stub_p=*/true);
468 /* If NAME is the name of a stub or a non-lazy pointer , mark the stub
469 or non-lazy pointer as used -- and mark the object to which the
470 pointer/stub refers as used as well, since the pointer/stub will
471 emit a reference to it. */
474 machopic_validate_stub_or_non_lazy_ptr (const char *name)
476 machopic_indirection *p;
478 p = ((machopic_indirection *)
479 (htab_find_with_hash (machopic_indirections, name,
480 htab_hash_string (name))));
483 const char *real_name;
488 /* Do what output_addr_const will do when we actually call it. */
489 if (SYMBOL_REF_DECL (p->symbol))
490 mark_decl_referenced (SYMBOL_REF_DECL (p->symbol));
492 real_name = targetm.strip_name_encoding (XSTR (p->symbol, 0));
494 id = maybe_get_identifier (real_name);
496 mark_referenced (id);
500 /* Transform ORIG, which may be any data source, to the corresponding
501 source using indirections. */
504 machopic_indirect_data_reference (rtx orig, rtx reg)
508 if (! MACHOPIC_INDIRECT)
511 if (GET_CODE (orig) == SYMBOL_REF)
513 int defined = machopic_data_defined_p (orig);
515 if (defined && MACHO_DYNAMIC_NO_PIC_P)
517 #if defined (TARGET_TOC)
518 /* Create a new register for CSE opportunities. */
519 rtx hi_reg = (!can_create_pseudo_p () ? reg : gen_reg_rtx (Pmode));
520 emit_insn (gen_macho_high (hi_reg, orig));
521 emit_insn (gen_macho_low (reg, hi_reg, orig));
523 /* some other cpu -- writeme! */
530 #if defined (TARGET_TOC) || defined (HAVE_lo_sum)
531 rtx pic_base = machopic_function_base_sym ();
532 rtx offset = gen_pic_offset (orig, pic_base);
535 #if defined (TARGET_TOC) /* i.e., PowerPC */
536 rtx hi_sum_reg = (!can_create_pseudo_p ()
538 : gen_reg_rtx (Pmode));
542 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
543 gen_rtx_PLUS (Pmode, pic_offset_table_rtx,
544 gen_rtx_HIGH (Pmode, offset))));
545 emit_insn (gen_rtx_SET (Pmode, reg,
546 gen_rtx_LO_SUM (Pmode, hi_sum_reg, offset)));
550 #if defined (HAVE_lo_sum)
553 emit_insn (gen_rtx_SET (VOIDmode, reg,
554 gen_rtx_HIGH (Pmode, offset)));
555 emit_insn (gen_rtx_SET (VOIDmode, reg,
556 gen_rtx_LO_SUM (Pmode, reg, offset)));
557 emit_insn (gen_rtx_USE (VOIDmode, pic_offset_table_rtx));
559 orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg);
565 ptr_ref = (gen_rtx_SYMBOL_REF
567 machopic_indirection_name (orig, /*stub_p=*/false)));
569 SYMBOL_REF_DATA (ptr_ref) = SYMBOL_REF_DATA (orig);
571 ptr_ref = gen_const_mem (Pmode, ptr_ref);
572 machopic_define_symbol (ptr_ref);
576 else if (GET_CODE (orig) == CONST)
580 /* legitimize both operands of the PLUS */
581 if (GET_CODE (XEXP (orig, 0)) == PLUS)
583 base = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 0),
585 orig = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 1),
586 (base == reg ? 0 : reg));
591 if (MACHOPIC_PURE && GET_CODE (orig) == CONST_INT)
592 result = plus_constant (base, INTVAL (orig));
594 result = gen_rtx_PLUS (Pmode, base, orig);
596 if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM)
600 emit_move_insn (reg, result);
605 result = force_reg (GET_MODE (result), result);
612 else if (GET_CODE (orig) == MEM)
613 XEXP (ptr_ref, 0) = machopic_indirect_data_reference (XEXP (orig, 0), reg);
614 /* When the target is i386, this code prevents crashes due to the
615 compiler's ignorance on how to move the PIC base register to
616 other registers. (The reload phase sometimes introduces such
618 else if (GET_CODE (orig) == PLUS
619 && GET_CODE (XEXP (orig, 0)) == REG
620 && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM
622 /* Prevent the same register from being erroneously used
623 as both the base and index registers. */
624 && GET_CODE (XEXP (orig, 1)) == CONST
628 emit_move_insn (reg, XEXP (orig, 0));
629 XEXP (ptr_ref, 0) = reg;
634 /* Transform TARGET (a MEM), which is a function call target, to the
635 corresponding symbol_stub if necessary. Return a new MEM. */
638 machopic_indirect_call_target (rtx target)
640 if (GET_CODE (target) != MEM)
643 if (MACHOPIC_INDIRECT
644 && GET_CODE (XEXP (target, 0)) == SYMBOL_REF
645 && !(SYMBOL_REF_FLAGS (XEXP (target, 0))
646 & MACHO_SYMBOL_FLAG_DEFINED))
648 rtx sym_ref = XEXP (target, 0);
649 const char *stub_name = machopic_indirection_name (sym_ref,
651 enum machine_mode mode = GET_MODE (sym_ref);
653 XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name);
654 SYMBOL_REF_DATA (XEXP (target, 0)) = SYMBOL_REF_DATA (sym_ref);
655 MEM_READONLY_P (target) = 1;
656 MEM_NOTRAP_P (target) = 1;
663 machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg)
667 if (! MACHOPIC_INDIRECT)
670 /* First handle a simple SYMBOL_REF or LABEL_REF */
671 if (GET_CODE (orig) == LABEL_REF
672 || (GET_CODE (orig) == SYMBOL_REF
675 /* addr(foo) = &func+(foo-func) */
678 orig = machopic_indirect_data_reference (orig, reg);
680 if (GET_CODE (orig) == PLUS
681 && GET_CODE (XEXP (orig, 0)) == REG)
684 return force_reg (mode, orig);
686 emit_move_insn (reg, orig);
690 /* if dynamic-no-pic we don't have a pic base */
691 if (MACHO_DYNAMIC_NO_PIC_P)
694 pic_base = machopic_function_base_sym ();
696 if (GET_CODE (orig) == MEM)
700 gcc_assert (!reload_in_progress);
701 reg = gen_reg_rtx (Pmode);
705 if (MACHO_DYNAMIC_NO_PIC_P
706 && (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
707 || GET_CODE (XEXP (orig, 0)) == LABEL_REF))
709 #if defined (TARGET_TOC) /* ppc */
710 rtx temp_reg = (!can_create_pseudo_p ()
712 gen_reg_rtx (Pmode));
713 rtx asym = XEXP (orig, 0);
716 emit_insn (gen_macho_high (temp_reg, asym));
717 mem = gen_const_mem (GET_MODE (orig),
718 gen_rtx_LO_SUM (Pmode, temp_reg, asym));
719 emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
721 /* Some other CPU -- WriteMe! but right now there are no other
722 platforms that can use dynamic-no-pic */
728 if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
729 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
731 rtx offset = gen_pic_offset (XEXP (orig, 0), pic_base);
732 #if defined (TARGET_TOC) /* i.e., PowerPC */
733 /* Generating a new reg may expose opportunities for
734 common subexpression elimination. */
735 rtx hi_sum_reg = (!can_create_pseudo_p ()
737 : gen_reg_rtx (Pmode));
742 sum = gen_rtx_HIGH (Pmode, offset);
743 if (! MACHO_DYNAMIC_NO_PIC_P)
744 sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum);
746 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, sum));
748 mem = gen_const_mem (GET_MODE (orig),
749 gen_rtx_LO_SUM (Pmode,
750 hi_sum_reg, offset));
751 insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
752 set_unique_reg_note (insn, REG_EQUAL, pic_ref);
756 emit_insn (gen_rtx_USE (VOIDmode,
758 PIC_OFFSET_TABLE_REGNUM)));
760 emit_insn (gen_rtx_SET (VOIDmode, reg,
762 gen_rtx_CONST (Pmode,
764 emit_insn (gen_rtx_SET (VOIDmode, reg,
765 gen_rtx_LO_SUM (Pmode, reg,
766 gen_rtx_CONST (Pmode, offset))));
767 pic_ref = gen_rtx_PLUS (Pmode,
768 pic_offset_table_rtx, reg);
772 #endif /* HAVE_lo_sum */
774 rtx pic = pic_offset_table_rtx;
775 if (GET_CODE (pic) != REG)
777 emit_move_insn (reg, pic);
781 emit_insn (gen_rtx_USE (VOIDmode,
783 PIC_OFFSET_TABLE_REGNUM)));
786 if (reload_in_progress)
787 df_set_regs_ever_live (REGNO (pic), true);
788 pic_ref = gen_rtx_PLUS (Pmode, pic,
789 gen_pic_offset (XEXP (orig, 0),
793 #if !defined (TARGET_TOC)
794 emit_move_insn (reg, pic_ref);
795 pic_ref = gen_const_mem (GET_MODE (orig), reg);
802 if (GET_CODE (orig) == SYMBOL_REF
803 || GET_CODE (orig) == LABEL_REF)
805 rtx offset = gen_pic_offset (orig, pic_base);
806 #if defined (TARGET_TOC) /* i.e., PowerPC */
811 gcc_assert (!reload_in_progress);
812 reg = gen_reg_rtx (Pmode);
817 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
818 (MACHO_DYNAMIC_NO_PIC_P)
819 ? gen_rtx_HIGH (Pmode, offset)
820 : gen_rtx_PLUS (Pmode,
821 pic_offset_table_rtx,
824 emit_insn (gen_rtx_SET (VOIDmode, reg,
825 gen_rtx_LO_SUM (Pmode,
826 hi_sum_reg, offset)));
829 emit_insn (gen_rtx_SET (VOIDmode, reg,
830 gen_rtx_HIGH (Pmode, offset)));
831 emit_insn (gen_rtx_SET (VOIDmode, reg,
832 gen_rtx_LO_SUM (Pmode, reg, offset)));
833 pic_ref = gen_rtx_PLUS (Pmode,
834 pic_offset_table_rtx, reg);
838 #endif /* HAVE_lo_sum */
841 || GET_CODE (orig) == SUBREG)
847 rtx pic = pic_offset_table_rtx;
848 if (GET_CODE (pic) != REG)
850 emit_move_insn (reg, pic);
854 emit_insn (gen_rtx_USE (VOIDmode,
855 pic_offset_table_rtx));
857 if (reload_in_progress)
858 df_set_regs_ever_live (REGNO (pic), true);
859 pic_ref = gen_rtx_PLUS (Pmode,
861 gen_pic_offset (orig, pic_base));
866 if (GET_CODE (pic_ref) != REG)
870 emit_move_insn (reg, pic_ref);
875 return force_reg (mode, pic_ref);
884 else if (GET_CODE (orig) == SYMBOL_REF)
887 else if (GET_CODE (orig) == PLUS
888 && (GET_CODE (XEXP (orig, 0)) == MEM
889 || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
890 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
891 && XEXP (orig, 0) != pic_offset_table_rtx
892 && GET_CODE (XEXP (orig, 1)) != REG)
896 int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM);
898 base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
899 orig = machopic_legitimize_pic_address (XEXP (orig, 1),
900 Pmode, (base == reg ? 0 : reg));
901 if (GET_CODE (orig) == CONST_INT)
903 pic_ref = plus_constant (base, INTVAL (orig));
907 pic_ref = gen_rtx_PLUS (Pmode, base, orig);
909 if (reg && is_complex)
911 emit_move_insn (reg, pic_ref);
914 /* Likewise, should we set special REG_NOTEs here? */
917 else if (GET_CODE (orig) == CONST)
919 return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
922 else if (GET_CODE (orig) == MEM
923 && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF)
925 rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
926 addr = replace_equiv_address (orig, addr);
927 emit_move_insn (reg, addr);
934 /* Output the stub or non-lazy pointer in *SLOT, if it has been used.
935 DATA is the FILE* for assembly output. Called from
939 machopic_output_indirection (void **slot, void *data)
941 machopic_indirection *p = *((machopic_indirection **) slot);
942 FILE *asm_out_file = (FILE *) data;
944 const char *sym_name;
945 const char *ptr_name;
951 sym_name = XSTR (symbol, 0);
952 ptr_name = p->ptr_name;
960 id = maybe_get_identifier (sym_name);
965 while (IDENTIFIER_TRANSPARENT_ALIAS (id))
966 id = TREE_CHAIN (id);
968 sym_name = IDENTIFIER_POINTER (id);
971 sym = alloca (strlen (sym_name) + 2);
972 if (sym_name[0] == '*' || sym_name[0] == '&')
973 strcpy (sym, sym_name + 1);
974 else if (sym_name[0] == '-' || sym_name[0] == '+')
975 strcpy (sym, sym_name);
977 sprintf (sym, "%s%s", user_label_prefix, sym_name);
979 stub = alloca (strlen (ptr_name) + 2);
980 if (ptr_name[0] == '*' || ptr_name[0] == '&')
981 strcpy (stub, ptr_name + 1);
983 sprintf (stub, "%s%s", user_label_prefix, ptr_name);
985 machopic_output_stub (asm_out_file, sym, stub);
987 else if (! indirect_data (symbol)
988 && (machopic_symbol_defined_p (symbol)
989 || SYMBOL_REF_LOCAL_P (symbol)))
991 switch_to_section (data_section);
992 assemble_align (GET_MODE_ALIGNMENT (Pmode));
993 assemble_label (ptr_name);
994 assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name),
995 GET_MODE_SIZE (Pmode),
996 GET_MODE_ALIGNMENT (Pmode), 1);
1000 rtx init = const0_rtx;
1002 switch_to_section (darwin_sections[machopic_nl_symbol_ptr_section]);
1003 assemble_name (asm_out_file, ptr_name);
1004 fprintf (asm_out_file, ":\n");
1006 fprintf (asm_out_file, "\t.indirect_symbol ");
1007 assemble_name (asm_out_file, sym_name);
1008 fprintf (asm_out_file, "\n");
1010 /* Variables that are marked with MACHO_SYMBOL_STATIC need to
1011 have their symbol name instead of 0 in the second entry of
1012 the non-lazy symbol pointer data structure when they are
1013 defined. This allows the runtime to rebind newer instances
1014 of the translation unit with the original instance of the
1017 if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC)
1018 && machopic_symbol_defined_p (symbol))
1019 init = gen_rtx_SYMBOL_REF (Pmode, sym_name);
1021 assemble_integer (init, GET_MODE_SIZE (Pmode),
1022 GET_MODE_ALIGNMENT (Pmode), 1);
1029 machopic_finish (FILE *asm_out_file)
1031 if (machopic_indirections)
1032 htab_traverse_noresize (machopic_indirections,
1033 machopic_output_indirection,
1038 machopic_operand_p (rtx op)
1040 if (MACHOPIC_JUST_INDIRECT)
1042 while (GET_CODE (op) == CONST)
1045 if (GET_CODE (op) == SYMBOL_REF)
1046 return machopic_symbol_defined_p (op);
1051 while (GET_CODE (op) == CONST)
1054 if (GET_CODE (op) == MINUS
1055 && GET_CODE (XEXP (op, 0)) == SYMBOL_REF
1056 && GET_CODE (XEXP (op, 1)) == SYMBOL_REF
1057 && machopic_symbol_defined_p (XEXP (op, 0))
1058 && machopic_symbol_defined_p (XEXP (op, 1)))
1064 /* This function records whether a given name corresponds to a defined
1065 or undefined function or variable, for machopic_classify_ident to
1069 darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
1073 /* Do the standard encoding things first. */
1074 default_encode_section_info (decl, rtl, first);
1076 if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
1079 sym_ref = XEXP (rtl, 0);
1080 if (TREE_CODE (decl) == VAR_DECL)
1081 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE;
1083 if (!DECL_EXTERNAL (decl)
1084 && (!TREE_PUBLIC (decl) || !DECL_WEAK (decl))
1085 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))
1086 && ((TREE_STATIC (decl)
1087 && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl)))
1088 || (!DECL_COMMON (decl) && DECL_INITIAL (decl)
1089 && DECL_INITIAL (decl) != error_mark_node)))
1090 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
1092 if (! TREE_PUBLIC (decl))
1093 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC;
1097 darwin_mark_decl_preserved (const char *name)
1099 fprintf (asm_out_file, ".no_dead_strip ");
1100 assemble_name (asm_out_file, name);
1101 fputc ('\n', asm_out_file);
1105 darwin_text_section (int reloc, int weak)
1109 ? darwin_sections[text_unlikely_coal_section]
1110 : unlikely_text_section ());
1113 ? darwin_sections[text_coal_section]
1118 darwin_rodata_section (int weak)
1121 ? darwin_sections[const_coal_section]
1122 : darwin_sections[const_section]);
1126 darwin_mergeable_string_section (tree exp,
1127 unsigned HOST_WIDE_INT align)
1129 if (flag_merge_constants
1130 && TREE_CODE (exp) == STRING_CST
1131 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE
1133 && ((size_t) TREE_STRING_LENGTH (exp)
1134 == strlen (TREE_STRING_POINTER (exp)) + 1))
1135 return darwin_sections[cstring_section];
1137 return readonly_data_section;
1140 #ifndef HAVE_GAS_LITERAL16
1141 #define HAVE_GAS_LITERAL16 0
1145 darwin_mergeable_constant_section (tree exp,
1146 unsigned HOST_WIDE_INT align)
1148 enum machine_mode mode = DECL_MODE (exp);
1149 unsigned int modesize = GET_MODE_BITSIZE (mode);
1151 if (flag_merge_constants
1154 && modesize <= align
1157 && (align & (align -1)) == 0)
1159 tree size = TYPE_SIZE_UNIT (TREE_TYPE (exp));
1161 if (TREE_CODE (size) == INTEGER_CST
1162 && TREE_INT_CST_LOW (size) == 4
1163 && TREE_INT_CST_HIGH (size) == 0)
1164 return darwin_sections[literal4_section];
1165 else if (TREE_CODE (size) == INTEGER_CST
1166 && TREE_INT_CST_LOW (size) == 8
1167 && TREE_INT_CST_HIGH (size) == 0)
1168 return darwin_sections[literal8_section];
1169 else if (HAVE_GAS_LITERAL16
1171 && TREE_CODE (size) == INTEGER_CST
1172 && TREE_INT_CST_LOW (size) == 16
1173 && TREE_INT_CST_HIGH (size) == 0)
1174 return darwin_sections[literal16_section];
1176 return readonly_data_section;
1179 return readonly_data_section;
1183 machopic_reloc_rw_mask (void)
1185 return MACHOPIC_INDIRECT ? 3 : 0;
1189 machopic_select_section (tree decl,
1191 unsigned HOST_WIDE_INT align)
1193 bool weak = (DECL_P (decl)
1195 && (lookup_attribute ("weak", DECL_ATTRIBUTES (decl))
1196 || ! lookup_attribute ("weak_import",
1197 DECL_ATTRIBUTES (decl))));
1198 section *base_section;
1200 switch (categorize_decl_for_section (decl, reloc))
1203 base_section = darwin_text_section (reloc, weak);
1207 case SECCAT_SRODATA:
1208 base_section = darwin_rodata_section (weak);
1211 case SECCAT_RODATA_MERGE_STR:
1212 base_section = darwin_mergeable_string_section (decl, align);
1215 case SECCAT_RODATA_MERGE_STR_INIT:
1216 base_section = darwin_mergeable_string_section (DECL_INITIAL (decl), align);
1219 case SECCAT_RODATA_MERGE_CONST:
1220 base_section = darwin_mergeable_constant_section (decl, align);
1224 case SECCAT_DATA_REL:
1225 case SECCAT_DATA_REL_LOCAL:
1226 case SECCAT_DATA_REL_RO:
1227 case SECCAT_DATA_REL_RO_LOCAL:
1233 if (TREE_READONLY (decl) || TREE_CONSTANT (decl))
1234 base_section = weak ? darwin_sections[const_data_coal_section]
1235 : darwin_sections[const_data_section];
1237 base_section = weak ? darwin_sections[data_coal_section] : data_section;
1244 /* Darwin weird special cases. */
1245 if (TREE_CODE (decl) == CONSTRUCTOR
1247 && TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
1248 && TYPE_NAME (TREE_TYPE (decl)))
1250 tree name = TYPE_NAME (TREE_TYPE (decl));
1251 if (TREE_CODE (name) == TYPE_DECL)
1252 name = DECL_NAME (name);
1254 if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_ObjCString"))
1256 if (flag_next_runtime)
1257 return darwin_sections[objc_constant_string_object_section];
1259 return darwin_sections[objc_string_object_section];
1262 return base_section;
1264 else if (TREE_CODE (decl) == VAR_DECL
1266 && TREE_CODE (DECL_NAME (decl)) == IDENTIFIER_NODE
1267 && IDENTIFIER_POINTER (DECL_NAME (decl))
1268 && !strncmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "_OBJC_", 6))
1270 const char *name = IDENTIFIER_POINTER (DECL_NAME (decl));
1272 if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20))
1273 return darwin_sections[objc_cls_meth_section];
1274 else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23))
1275 return darwin_sections[objc_inst_meth_section];
1276 else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20))
1277 return darwin_sections[objc_cat_cls_meth_section];
1278 else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23))
1279 return darwin_sections[objc_cat_inst_meth_section];
1280 else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22))
1281 return darwin_sections[objc_class_vars_section];
1282 else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25))
1283 return darwin_sections[objc_instance_vars_section];
1284 else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22))
1285 return darwin_sections[objc_cat_cls_meth_section];
1286 else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17))
1287 return darwin_sections[objc_class_names_section];
1288 else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20))
1289 return darwin_sections[objc_meth_var_names_section];
1290 else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20))
1291 return darwin_sections[objc_meth_var_types_section];
1292 else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22))
1293 return darwin_sections[objc_cls_refs_section];
1294 else if (!strncmp (name, "_OBJC_CLASS_", 12))
1295 return darwin_sections[objc_class_section];
1296 else if (!strncmp (name, "_OBJC_METACLASS_", 16))
1297 return darwin_sections[objc_meta_class_section];
1298 else if (!strncmp (name, "_OBJC_CATEGORY_", 15))
1299 return darwin_sections[objc_category_section];
1300 else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25))
1301 return darwin_sections[objc_selector_refs_section];
1302 else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20))
1303 return darwin_sections[objc_selector_fixup_section];
1304 else if (!strncmp (name, "_OBJC_SYMBOLS", 13))
1305 return darwin_sections[objc_symbols_section];
1306 else if (!strncmp (name, "_OBJC_MODULES", 13))
1307 return darwin_sections[objc_module_info_section];
1308 else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16))
1309 return darwin_sections[objc_image_info_section];
1310 else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32))
1311 return darwin_sections[objc_cat_inst_meth_section];
1312 else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29))
1313 return darwin_sections[objc_cat_cls_meth_section];
1314 else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20))
1315 return darwin_sections[objc_cat_cls_meth_section];
1316 else if (!strncmp (name, "_OBJC_PROTOCOL_", 15))
1317 return darwin_sections[objc_protocol_section];
1319 return base_section;
1322 return base_section;
1325 /* This can be called with address expressions as "rtx".
1326 They must go in "const". */
1329 machopic_select_rtx_section (enum machine_mode mode, rtx x,
1330 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
1332 if (GET_MODE_SIZE (mode) == 8
1333 && (GET_CODE (x) == CONST_INT
1334 || GET_CODE (x) == CONST_DOUBLE))
1335 return darwin_sections[literal8_section];
1336 else if (GET_MODE_SIZE (mode) == 4
1337 && (GET_CODE (x) == CONST_INT
1338 || GET_CODE (x) == CONST_DOUBLE))
1339 return darwin_sections[literal4_section];
1340 else if (HAVE_GAS_LITERAL16
1342 && GET_MODE_SIZE (mode) == 16
1343 && (GET_CODE (x) == CONST_INT
1344 || GET_CODE (x) == CONST_DOUBLE
1345 || GET_CODE (x) == CONST_VECTOR))
1346 return darwin_sections[literal16_section];
1347 else if (MACHOPIC_INDIRECT
1348 && (GET_CODE (x) == SYMBOL_REF
1349 || GET_CODE (x) == CONST
1350 || GET_CODE (x) == LABEL_REF))
1351 return darwin_sections[const_data_section];
1353 return darwin_sections[const_section];
1357 machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1359 if (MACHOPIC_INDIRECT)
1360 switch_to_section (darwin_sections[mod_init_section]);
1362 switch_to_section (darwin_sections[constructor_section]);
1363 assemble_align (POINTER_SIZE);
1364 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1366 if (! MACHOPIC_INDIRECT)
1367 fprintf (asm_out_file, ".reference .constructors_used\n");
1371 machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1373 if (MACHOPIC_INDIRECT)
1374 switch_to_section (darwin_sections[mod_term_section]);
1376 switch_to_section (darwin_sections[destructor_section]);
1377 assemble_align (POINTER_SIZE);
1378 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1380 if (! MACHOPIC_INDIRECT)
1381 fprintf (asm_out_file, ".reference .destructors_used\n");
1385 darwin_globalize_label (FILE *stream, const char *name)
1387 if (!!strncmp (name, "_OBJC_", 6))
1388 default_globalize_label (stream, name);
1392 darwin_asm_named_section (const char *name,
1393 unsigned int flags ATTRIBUTE_UNUSED,
1394 tree decl ATTRIBUTE_UNUSED)
1396 fprintf (asm_out_file, "\t.section %s\n", name);
1400 darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED)
1402 /* Darwin does not use unique sections. */
1405 /* Handle __attribute__ ((apple_kext_compatibility)).
1406 This only applies to darwin kexts for 2.95 compatibility -- it shrinks the
1407 vtable for classes with this attribute (and their descendants) by not
1408 outputting the new 3.0 nondeleting destructor. This means that such
1409 objects CANNOT be allocated on the stack or as globals UNLESS they have
1410 a completely empty `operator delete'.
1411 Luckily, this fits in with the Darwin kext model.
1413 This attribute also disables gcc3's potential overlaying of derived
1414 class data members on the padding at the end of the base class. */
1417 darwin_handle_kext_attribute (tree *node, tree name,
1418 tree args ATTRIBUTE_UNUSED,
1419 int flags ATTRIBUTE_UNUSED,
1422 /* APPLE KEXT stuff -- only applies with pure static C++ code. */
1423 if (! TARGET_KEXTABI)
1425 warning (0, "%<%s%> 2.95 vtable-compatibility attribute applies "
1426 "only when compiling a kext", IDENTIFIER_POINTER (name));
1428 *no_add_attrs = true;
1430 else if (TREE_CODE (*node) != RECORD_TYPE)
1432 warning (0, "%<%s%> 2.95 vtable-compatibility attribute applies "
1433 "only to C++ classes", IDENTIFIER_POINTER (name));
1435 *no_add_attrs = true;
1441 /* Handle a "weak_import" attribute; arguments as in
1442 struct attribute_spec.handler. */
1445 darwin_handle_weak_import_attribute (tree *node, tree name,
1446 tree ARG_UNUSED (args),
1447 int ARG_UNUSED (flags),
1448 bool * no_add_attrs)
1450 if (TREE_CODE (*node) != FUNCTION_DECL && TREE_CODE (*node) != VAR_DECL)
1452 warning (OPT_Wattributes, "%qs attribute ignored",
1453 IDENTIFIER_POINTER (name));
1454 *no_add_attrs = true;
1457 declare_weak (*node);
1463 no_dead_strip (FILE *file, const char *lab)
1465 fprintf (file, ".no_dead_strip %s\n", lab);
1468 /* Emit a label for an FDE, making it global and/or weak if appropriate.
1469 The third parameter is nonzero if this is for exception handling.
1470 The fourth parameter is nonzero if this is just a placeholder for an
1471 FDE that we are omitting. */
1474 darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty)
1480 if (DECL_ASSEMBLER_NAME_SET_P (decl))
1481 base = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1483 base = IDENTIFIER_POINTER (DECL_NAME (decl));
1485 base = targetm.strip_name_encoding (base);
1486 need_quotes = name_needs_quotes (base);
1491 lab = concat (need_quotes ? "\"" : "", user_label_prefix, base, ".eh",
1492 need_quotes ? "\"" : "", NULL);
1494 if (TREE_PUBLIC (decl))
1495 fprintf (file, "\t%s %s\n",
1496 (DECL_VISIBILITY (decl) != VISIBILITY_HIDDEN
1498 : ".private_extern"),
1501 if (DECL_WEAK (decl))
1502 fprintf (file, "\t.weak_definition %s\n", lab);
1506 fprintf (file, "%s = 0\n", lab);
1508 /* Mark the absolute .eh and .eh1 style labels as needed to
1509 ensure that we don't dead code strip them and keep such
1510 labels from another instantiation point until we can fix this
1511 properly with group comdat support. */
1512 no_dead_strip (file, lab);
1515 fprintf (file, "%s:\n", lab);
1520 static GTY(()) unsigned long except_table_label_num;
1523 darwin_emit_except_table_label (FILE *file)
1525 char section_start_label[30];
1527 ASM_GENERATE_INTERNAL_LABEL (section_start_label, "GCC_except_table",
1528 except_table_label_num++);
1529 ASM_OUTPUT_LABEL (file, section_start_label);
1531 /* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */
1534 darwin_non_lazy_pcrel (FILE *file, rtx addr)
1536 const char *nlp_name;
1538 gcc_assert (GET_CODE (addr) == SYMBOL_REF);
1540 nlp_name = machopic_indirection_name (addr, /*stub_p=*/false);
1541 fputs ("\t.long\t", file);
1542 ASM_OUTPUT_LABELREF (file, nlp_name);
1546 /* Emit an assembler directive to set visibility for a symbol. The
1547 only supported visibilities are VISIBILITY_DEFAULT and
1548 VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private
1549 extern". There is no MACH-O equivalent of ELF's
1550 VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */
1553 darwin_assemble_visibility (tree decl, int vis)
1555 if (vis == VISIBILITY_DEFAULT)
1557 else if (vis == VISIBILITY_HIDDEN)
1559 fputs ("\t.private_extern ", asm_out_file);
1560 assemble_name (asm_out_file,
1561 (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))));
1562 fputs ("\n", asm_out_file);
1565 warning (OPT_Wattributes, "internal and protected visibility attributes "
1566 "not supported in this configuration; ignored");
1569 /* Output a difference of two labels that will be an assembly time
1570 constant if the two labels are local. (.long lab1-lab2 will be
1571 very different if lab1 is at the boundary between two sections; it
1572 will be relocated according to the second section, not the first,
1573 so one ends up with a difference between labels in different
1574 sections, which is bad in the dwarf2 eh context for instance.) */
1576 static int darwin_dwarf_label_counter;
1579 darwin_asm_output_dwarf_delta (FILE *file, int size,
1580 const char *lab1, const char *lab2)
1582 int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L'
1583 && lab2[0] == '*' && lab2[1] == 'L');
1584 const char *directive = (size == 8 ? ".quad" : ".long");
1587 fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter);
1589 fprintf (file, "\t%s\t", directive);
1590 assemble_name_raw (file, lab1);
1591 fprintf (file, "-");
1592 assemble_name_raw (file, lab2);
1594 fprintf (file, "\n\t%s L$set$%d", directive, darwin_dwarf_label_counter++);
1597 /* Output labels for the start of the DWARF sections if necessary. */
1599 darwin_file_start (void)
1601 if (write_symbols == DWARF2_DEBUG)
1603 static const char * const debugnames[] =
1605 DEBUG_FRAME_SECTION,
1607 DEBUG_ABBREV_SECTION,
1608 DEBUG_ARANGES_SECTION,
1609 DEBUG_MACINFO_SECTION,
1612 DEBUG_PUBNAMES_SECTION,
1613 DEBUG_PUBTYPES_SECTION,
1615 DEBUG_RANGES_SECTION
1619 for (i = 0; i < ARRAY_SIZE (debugnames); i++)
1623 switch_to_section (get_section (debugnames[i], SECTION_DEBUG, NULL));
1625 gcc_assert (strncmp (debugnames[i], "__DWARF,", 8) == 0);
1626 gcc_assert (strchr (debugnames[i] + 8, ','));
1628 namelen = strchr (debugnames[i] + 8, ',') - (debugnames[i] + 8);
1629 fprintf (asm_out_file, "Lsection%.*s:\n", namelen, debugnames[i] + 8);
1634 /* Output an offset in a DWARF section on Darwin. On Darwin, DWARF section
1635 offsets are not represented using relocs in .o files; either the
1636 section never leaves the .o file, or the linker or other tool is
1637 responsible for parsing the DWARF and updating the offsets. */
1640 darwin_asm_output_dwarf_offset (FILE *file, int size, const char * lab,
1646 gcc_assert (base->common.flags & SECTION_NAMED);
1647 gcc_assert (strncmp (base->named.name, "__DWARF,", 8) == 0);
1648 gcc_assert (strchr (base->named.name + 8, ','));
1650 namelen = strchr (base->named.name + 8, ',') - (base->named.name + 8);
1651 sprintf (sname, "*Lsection%.*s", namelen, base->named.name + 8);
1652 darwin_asm_output_dwarf_delta (file, size, lab, sname);
1656 darwin_file_end (void)
1658 machopic_finish (asm_out_file);
1659 if (strcmp (lang_hooks.name, "GNU C++") == 0)
1661 switch_to_section (darwin_sections[constructor_section]);
1662 switch_to_section (darwin_sections[destructor_section]);
1663 ASM_OUTPUT_ALIGN (asm_out_file, 1);
1665 fprintf (asm_out_file, "\t.subsections_via_symbols\n");
1668 /* TODO: Add a language hook for identifying if a decl is a vtable. */
1669 #define DARWIN_VTABLE_P(DECL) 0
1671 /* Cross-module name binding. Darwin does not support overriding
1672 functions at dynamic-link time, except for vtables in kexts. */
1675 darwin_binds_local_p (tree decl)
1677 return default_binds_local_p_1 (decl,
1678 TARGET_KEXTABI && DARWIN_VTABLE_P (decl));
1682 /* See TARGET_ASM_OUTPUT_ANCHOR for why we can't do this yet. */
1683 /* The Darwin's implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
1684 anchor relative to ".", the current section position. We cannot use
1685 the default one because ASM_OUTPUT_DEF is wrong for Darwin. */
1688 darwin_asm_output_anchor (rtx symbol)
1690 fprintf (asm_out_file, "\t.set\t");
1691 assemble_name (asm_out_file, XSTR (symbol, 0));
1692 fprintf (asm_out_file, ", . + " HOST_WIDE_INT_PRINT_DEC "\n",
1693 SYMBOL_REF_BLOCK_OFFSET (symbol));
1697 /* Set the darwin specific attributes on TYPE. */
1699 darwin_set_default_type_attributes (tree type)
1701 if (darwin_ms_struct
1702 && TREE_CODE (type) == RECORD_TYPE)
1703 TYPE_ATTRIBUTES (type) = tree_cons (get_identifier ("ms_struct"),
1705 TYPE_ATTRIBUTES (type));
1708 /* True, iff we're generating code for loadable kernel extensions. */
1711 darwin_kextabi_p (void) {
1712 return flag_apple_kext;
1716 darwin_override_options (void)
1718 if (flag_mkernel || flag_apple_kext)
1720 /* -mkernel implies -fapple-kext for C++ */
1721 if (strcmp (lang_hooks.name, "GNU C++") == 0)
1722 flag_apple_kext = 1;
1726 /* No EH in kexts. */
1727 flag_exceptions = 0;
1728 /* No -fnon-call-exceptions data in kexts. */
1729 flag_non_call_exceptions = 0;
1731 if (flag_var_tracking
1732 && strverscmp (darwin_macosx_version_min, "10.5") >= 0)
1733 flag_var_tracking_uninit = 1;
1736 #include "gt-darwin.h"