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"
49 /* Darwin supports a feature called fix-and-continue, which is used
50 for rapid turn around debugging. When code is compiled with the
51 -mfix-and-continue flag, two changes are made to the generated code
52 that allow the system to do things that it would normally not be
53 able to do easily. These changes allow gdb to load in
54 recompilation of a translation unit that has been changed into a
55 running program and replace existing functions and methods of that
56 translation unit with versions of those functions and methods
57 from the newly compiled translation unit. The new functions access
58 the existing static symbols from the old translation unit, if the
59 symbol existed in the unit to be replaced, and from the new
60 translation unit, otherwise.
62 The changes are to insert 5 nops at the beginning of all functions
63 and to use indirection to get at static symbols. The 5 nops
64 are required by consumers of the generated code. Currently, gdb
65 uses this to patch in a jump to the overriding function, this
66 allows all uses of the old name to forward to the replacement,
67 including existing function pointers and virtual methods. See
68 rs6000_emit_prologue for the code that handles the nop insertions.
70 The added indirection allows gdb to redirect accesses to static
71 symbols from the newly loaded translation unit to the existing
72 symbol, if any. @code{static} symbols are special and are handled by
73 setting the second word in the .non_lazy_symbol_pointer data
74 structure to symbol. See indirect_data for the code that handles
75 the extra indirection, and machopic_output_indirection and its use
76 of MACHO_SYMBOL_STATIC for the code that handles @code{static}
77 symbol indirection. */
80 section * darwin_sections[NUM_DARWIN_SECTIONS];
82 /* True if we're setting __attribute__ ((ms_struct)). */
83 int darwin_ms_struct = false;
85 /* A get_unnamed_section callback used to switch to an ObjC section.
86 DIRECTIVE is as for output_section_asm_op. */
89 output_objc_section_asm_op (const void *directive)
91 static bool been_here = false;
95 static const enum darwin_section_enum tomark[] =
97 /* written, cold -> hot */
98 objc_cat_cls_meth_section,
99 objc_cat_inst_meth_section,
100 objc_string_object_section,
101 objc_constant_string_object_section,
102 objc_selector_refs_section,
103 objc_selector_fixup_section,
104 objc_cls_refs_section,
106 objc_meta_class_section,
107 /* shared, hot -> cold */
108 objc_cls_meth_section,
109 objc_inst_meth_section,
110 objc_protocol_section,
111 objc_class_names_section,
112 objc_meth_var_types_section,
113 objc_meth_var_names_section,
114 objc_category_section,
115 objc_class_vars_section,
116 objc_instance_vars_section,
117 objc_module_info_section,
123 for (i = 0; i < ARRAY_SIZE (tomark); i++)
124 switch_to_section (darwin_sections[tomark[i]]);
126 output_section_asm_op (directive);
129 /* Implement TARGET_ASM_INIT_SECTIONS. */
132 darwin_init_sections (void)
134 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) \
135 darwin_sections[NAME] = \
136 get_unnamed_section (FLAGS, (OBJC \
137 ? output_objc_section_asm_op \
138 : output_section_asm_op), \
140 #include "config/darwin-sections.def"
143 readonly_data_section = darwin_sections[const_section];
144 exception_section = darwin_sections[darwin_exception_section];
145 eh_frame_section = darwin_sections[darwin_eh_frame_section];
149 name_needs_quotes (const char *name)
152 while ((c = *name++) != '\0')
153 if (! ISIDNUM (c) && c != '.' && c != '$')
158 /* Return true if SYM_REF can be used without an indirection. */
160 machopic_symbol_defined_p (rtx sym_ref)
162 if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED)
165 /* If a symbol references local and is not an extern to this
166 file, then the symbol might be able to declared as defined. */
167 if (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref))
169 /* If the symbol references a variable and the variable is a
170 common symbol, then this symbol is not defined. */
171 if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_VARIABLE)
173 tree decl = SYMBOL_REF_DECL (sym_ref);
176 if (DECL_COMMON (decl))
184 /* This module assumes that (const (symbol_ref "foo")) is a legal pic
185 reference, which will not be changed. */
187 enum machopic_addr_class
188 machopic_classify_symbol (rtx sym_ref)
193 flags = SYMBOL_REF_FLAGS (sym_ref);
194 function_p = SYMBOL_REF_FUNCTION_P (sym_ref);
195 if (machopic_symbol_defined_p (sym_ref))
197 ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA);
200 ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA);
203 #ifndef TARGET_FIX_AND_CONTINUE
204 #define TARGET_FIX_AND_CONTINUE 0
207 /* Indicate when fix-and-continue style code generation is being used
208 and when a reference to data should be indirected so that it can be
209 rebound in a new translation unit to reference the original instance
210 of that data. Symbol names that are for code generation local to
211 the translation unit are bound to the new translation unit;
212 currently this means symbols that begin with L or _OBJC_;
213 otherwise, we indicate that an indirect reference should be made to
214 permit the runtime to rebind new instances of the translation unit
215 to the original instance of the data. */
218 indirect_data (rtx sym_ref)
223 /* If we aren't generating fix-and-continue code, don't do anything
225 if (TARGET_FIX_AND_CONTINUE == 0)
228 /* Otherwise, all symbol except symbols that begin with L or _OBJC_
229 are indirected. Symbols that begin with L and _OBJC_ are always
230 bound to the current translation unit as they are used for
231 generated local data of the translation unit. */
233 name = XSTR (sym_ref, 0);
235 lprefix = (((name[0] == '*' || name[0] == '&')
236 && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L')))
237 || (strncmp (name, "_OBJC_", 6) == 0));
244 machopic_data_defined_p (rtx sym_ref)
246 if (indirect_data (sym_ref))
249 switch (machopic_classify_symbol (sym_ref))
251 case MACHOPIC_DEFINED_DATA:
252 case MACHOPIC_DEFINED_FUNCTION:
260 machopic_define_symbol (rtx mem)
264 gcc_assert (GET_CODE (mem) == MEM);
265 sym_ref = XEXP (mem, 0);
266 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
269 static GTY(()) char * function_base;
272 machopic_function_base_name (void)
274 /* if dynamic-no-pic is on, we should not get here */
275 gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);
277 if (function_base == NULL)
279 (char *) ggc_alloc_string ("<pic base>", sizeof ("<pic base>"));
281 current_function_uses_pic_offset_table = 1;
283 return function_base;
286 /* Return a SYMBOL_REF for the PIC function base. */
289 machopic_function_base_sym (void)
293 sym_ref = gen_rtx_SYMBOL_REF (Pmode, machopic_function_base_name ());
294 SYMBOL_REF_FLAGS (sym_ref)
295 |= (MACHO_SYMBOL_FLAG_VARIABLE | MACHO_SYMBOL_FLAG_DEFINED);
299 /* Return either ORIG or (const:P (minus:P ORIG PIC_BASE)), depending
300 on whether pic_base is NULL or not. */
302 gen_pic_offset (rtx orig, rtx pic_base)
307 return gen_rtx_CONST (Pmode, gen_rtx_MINUS (Pmode, orig, pic_base));
310 static GTY(()) const char * function_base_func_name;
311 static GTY(()) int current_pic_label_num;
314 machopic_output_function_base_name (FILE *file)
316 const char *current_name;
318 /* If dynamic-no-pic is on, we should not get here. */
319 gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);
321 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
322 if (function_base_func_name != current_name)
324 ++current_pic_label_num;
325 function_base_func_name = current_name;
327 fprintf (file, "\"L%011d$pb\"", current_pic_label_num);
330 /* The suffix attached to non-lazy pointer symbols. */
331 #define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr"
332 /* The suffix attached to stub symbols. */
333 #define STUB_SUFFIX "$stub"
335 typedef struct machopic_indirection GTY (())
337 /* The SYMBOL_REF for the entity referenced. */
339 /* The name of the stub or non-lazy pointer. */
340 const char * ptr_name;
341 /* True iff this entry is for a stub (as opposed to a non-lazy
344 /* True iff this stub or pointer pointer has been referenced. */
346 } machopic_indirection;
348 /* A table mapping stub names and non-lazy pointer names to
349 SYMBOL_REFs for the stubbed-to and pointed-to entities. */
351 static GTY ((param_is (struct machopic_indirection))) htab_t
352 machopic_indirections;
354 /* Return a hash value for a SLOT in the indirections hash table. */
357 machopic_indirection_hash (const void *slot)
359 const machopic_indirection *p = (const machopic_indirection *) slot;
360 return htab_hash_string (p->ptr_name);
363 /* Returns true if the KEY is the same as that associated with
367 machopic_indirection_eq (const void *slot, const void *key)
369 return strcmp (((const machopic_indirection *) slot)->ptr_name, key) == 0;
372 /* Return the name of the non-lazy pointer (if STUB_P is false) or
373 stub (if STUB_B is true) corresponding to the given name. */
376 machopic_indirection_name (rtx sym_ref, bool stub_p)
379 const char *name = XSTR (sym_ref, 0);
380 size_t namelen = strlen (name);
381 machopic_indirection *p;
383 bool saw_star = false;
386 const char *prefix = user_label_prefix;
387 const char *quote = "";
390 id = maybe_get_identifier (name);
395 while (IDENTIFIER_TRANSPARENT_ALIAS (id))
396 id = TREE_CHAIN (id);
399 name = IDENTIFIER_POINTER (id);
400 namelen = strlen (name);
412 needs_quotes = name_needs_quotes (name);
419 suffix = STUB_SUFFIX;
421 suffix = NON_LAZY_POINTER_SUFFIX;
423 buffer = alloca (strlen ("&L")
430 /* Construct the name of the non-lazy pointer or stub. */
431 sprintf (buffer, "&%sL%s%s%s%s", quote, prefix, name, suffix, quote);
433 if (!machopic_indirections)
434 machopic_indirections = htab_create_ggc (37,
435 machopic_indirection_hash,
436 machopic_indirection_eq,
439 slot = htab_find_slot_with_hash (machopic_indirections, buffer,
440 htab_hash_string (buffer), INSERT);
443 p = (machopic_indirection *) *slot;
447 p = (machopic_indirection *) ggc_alloc (sizeof (machopic_indirection));
449 p->ptr_name = xstrdup (buffer);
458 /* Return the name of the stub for the mcount function. */
461 machopic_mcount_stub_name (void)
463 rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount");
464 return machopic_indirection_name (symbol, /*stub_p=*/true);
467 /* If NAME is the name of a stub or a non-lazy pointer , mark the stub
468 or non-lazy pointer as used -- and mark the object to which the
469 pointer/stub refers as used as well, since the pointer/stub will
470 emit a reference to it. */
473 machopic_validate_stub_or_non_lazy_ptr (const char *name)
475 machopic_indirection *p;
477 p = ((machopic_indirection *)
478 (htab_find_with_hash (machopic_indirections, name,
479 htab_hash_string (name))));
482 const char *real_name;
487 /* Do what output_addr_const will do when we actually call it. */
488 if (SYMBOL_REF_DECL (p->symbol))
489 mark_decl_referenced (SYMBOL_REF_DECL (p->symbol));
491 real_name = targetm.strip_name_encoding (XSTR (p->symbol, 0));
493 id = maybe_get_identifier (real_name);
495 mark_referenced (id);
499 /* Transform ORIG, which may be any data source, to the corresponding
500 source using indirections. */
503 machopic_indirect_data_reference (rtx orig, rtx reg)
507 if (! MACHOPIC_INDIRECT)
510 if (GET_CODE (orig) == SYMBOL_REF)
512 int defined = machopic_data_defined_p (orig);
514 if (defined && MACHO_DYNAMIC_NO_PIC_P)
516 #if defined (TARGET_TOC)
517 /* Create a new register for CSE opportunities. */
518 rtx hi_reg = (no_new_pseudos ? reg : gen_reg_rtx (Pmode));
519 emit_insn (gen_macho_high (hi_reg, orig));
520 emit_insn (gen_macho_low (reg, hi_reg, orig));
522 /* some other cpu -- writeme! */
529 #if defined (TARGET_TOC) || defined (HAVE_lo_sum)
530 rtx pic_base = machopic_function_base_sym ();
531 rtx offset = gen_pic_offset (orig, pic_base);
534 #if defined (TARGET_TOC) /* i.e., PowerPC */
535 rtx hi_sum_reg = (no_new_pseudos ? reg : gen_reg_rtx (Pmode));
539 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
540 gen_rtx_PLUS (Pmode, pic_offset_table_rtx,
541 gen_rtx_HIGH (Pmode, offset))));
542 emit_insn (gen_rtx_SET (Pmode, reg,
543 gen_rtx_LO_SUM (Pmode, hi_sum_reg, offset)));
547 #if defined (HAVE_lo_sum)
550 emit_insn (gen_rtx_SET (VOIDmode, reg,
551 gen_rtx_HIGH (Pmode, offset)));
552 emit_insn (gen_rtx_SET (VOIDmode, reg,
553 gen_rtx_LO_SUM (Pmode, reg, offset)));
554 emit_insn (gen_rtx_USE (VOIDmode, pic_offset_table_rtx));
556 orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg);
562 ptr_ref = (gen_rtx_SYMBOL_REF
564 machopic_indirection_name (orig, /*stub_p=*/false)));
566 SYMBOL_REF_DATA (ptr_ref) = SYMBOL_REF_DATA (orig);
568 ptr_ref = gen_const_mem (Pmode, ptr_ref);
569 machopic_define_symbol (ptr_ref);
573 else if (GET_CODE (orig) == CONST)
577 /* legitimize both operands of the PLUS */
578 if (GET_CODE (XEXP (orig, 0)) == PLUS)
580 base = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 0),
582 orig = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 1),
583 (base == reg ? 0 : reg));
588 if (MACHOPIC_PURE && GET_CODE (orig) == CONST_INT)
589 result = plus_constant (base, INTVAL (orig));
591 result = gen_rtx_PLUS (Pmode, base, orig);
593 if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM)
597 emit_move_insn (reg, result);
602 result = force_reg (GET_MODE (result), result);
609 else if (GET_CODE (orig) == MEM)
610 XEXP (ptr_ref, 0) = machopic_indirect_data_reference (XEXP (orig, 0), reg);
611 /* When the target is i386, this code prevents crashes due to the
612 compiler's ignorance on how to move the PIC base register to
613 other registers. (The reload phase sometimes introduces such
615 else if (GET_CODE (orig) == PLUS
616 && GET_CODE (XEXP (orig, 0)) == REG
617 && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM
619 /* Prevent the same register from being erroneously used
620 as both the base and index registers. */
621 && GET_CODE (XEXP (orig, 1)) == CONST
625 emit_move_insn (reg, XEXP (orig, 0));
626 XEXP (ptr_ref, 0) = reg;
631 /* Transform TARGET (a MEM), which is a function call target, to the
632 corresponding symbol_stub if necessary. Return a new MEM. */
635 machopic_indirect_call_target (rtx target)
637 if (GET_CODE (target) != MEM)
640 if (MACHOPIC_INDIRECT
641 && GET_CODE (XEXP (target, 0)) == SYMBOL_REF
642 && !(SYMBOL_REF_FLAGS (XEXP (target, 0))
643 & MACHO_SYMBOL_FLAG_DEFINED))
645 rtx sym_ref = XEXP (target, 0);
646 const char *stub_name = machopic_indirection_name (sym_ref,
648 enum machine_mode mode = GET_MODE (sym_ref);
650 XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name);
651 SYMBOL_REF_DATA (XEXP (target, 0)) = SYMBOL_REF_DATA (sym_ref);
652 MEM_READONLY_P (target) = 1;
653 MEM_NOTRAP_P (target) = 1;
660 machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg)
664 if (! MACHOPIC_INDIRECT)
667 /* First handle a simple SYMBOL_REF or LABEL_REF */
668 if (GET_CODE (orig) == LABEL_REF
669 || (GET_CODE (orig) == SYMBOL_REF
672 /* addr(foo) = &func+(foo-func) */
675 orig = machopic_indirect_data_reference (orig, reg);
677 if (GET_CODE (orig) == PLUS
678 && GET_CODE (XEXP (orig, 0)) == REG)
681 return force_reg (mode, orig);
683 emit_move_insn (reg, orig);
687 /* if dynamic-no-pic we don't have a pic base */
688 if (MACHO_DYNAMIC_NO_PIC_P)
691 pic_base = machopic_function_base_sym ();
693 if (GET_CODE (orig) == MEM)
697 gcc_assert (!reload_in_progress);
698 reg = gen_reg_rtx (Pmode);
702 if (MACHO_DYNAMIC_NO_PIC_P
703 && (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
704 || GET_CODE (XEXP (orig, 0)) == LABEL_REF))
706 #if defined (TARGET_TOC) /* ppc */
707 rtx temp_reg = (no_new_pseudos) ? reg : gen_reg_rtx (Pmode);
708 rtx asym = XEXP (orig, 0);
711 emit_insn (gen_macho_high (temp_reg, asym));
712 mem = gen_const_mem (GET_MODE (orig),
713 gen_rtx_LO_SUM (Pmode, temp_reg, asym));
714 emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
716 /* Some other CPU -- WriteMe! but right now there are no other
717 platforms that can use dynamic-no-pic */
723 if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
724 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
726 rtx offset = gen_pic_offset (XEXP (orig, 0), pic_base);
727 #if defined (TARGET_TOC) /* i.e., PowerPC */
728 /* Generating a new reg may expose opportunities for
729 common subexpression elimination. */
730 rtx hi_sum_reg = no_new_pseudos ? reg : gen_reg_rtx (Pmode);
735 sum = gen_rtx_HIGH (Pmode, offset);
736 if (! MACHO_DYNAMIC_NO_PIC_P)
737 sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum);
739 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, sum));
741 mem = gen_const_mem (GET_MODE (orig),
742 gen_rtx_LO_SUM (Pmode,
743 hi_sum_reg, offset));
744 insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
745 REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL, pic_ref,
750 emit_insn (gen_rtx_USE (VOIDmode,
752 PIC_OFFSET_TABLE_REGNUM)));
754 emit_insn (gen_rtx_SET (VOIDmode, reg,
756 gen_rtx_CONST (Pmode,
758 emit_insn (gen_rtx_SET (VOIDmode, reg,
759 gen_rtx_LO_SUM (Pmode, reg,
760 gen_rtx_CONST (Pmode, offset))));
761 pic_ref = gen_rtx_PLUS (Pmode,
762 pic_offset_table_rtx, reg);
766 #endif /* HAVE_lo_sum */
768 rtx pic = pic_offset_table_rtx;
769 if (GET_CODE (pic) != REG)
771 emit_move_insn (reg, pic);
775 emit_insn (gen_rtx_USE (VOIDmode,
777 PIC_OFFSET_TABLE_REGNUM)));
780 if (reload_in_progress)
781 regs_ever_live[REGNO (pic)] = 1;
782 pic_ref = gen_rtx_PLUS (Pmode, pic,
783 gen_pic_offset (XEXP (orig, 0),
787 #if !defined (TARGET_TOC)
788 emit_move_insn (reg, pic_ref);
789 pic_ref = gen_const_mem (GET_MODE (orig), reg);
796 if (GET_CODE (orig) == SYMBOL_REF
797 || GET_CODE (orig) == LABEL_REF)
799 rtx offset = gen_pic_offset (orig, pic_base);
800 #if defined (TARGET_TOC) /* i.e., PowerPC */
805 gcc_assert (!reload_in_progress);
806 reg = gen_reg_rtx (Pmode);
811 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
812 (MACHO_DYNAMIC_NO_PIC_P)
813 ? gen_rtx_HIGH (Pmode, offset)
814 : gen_rtx_PLUS (Pmode,
815 pic_offset_table_rtx,
818 emit_insn (gen_rtx_SET (VOIDmode, reg,
819 gen_rtx_LO_SUM (Pmode,
820 hi_sum_reg, offset)));
823 emit_insn (gen_rtx_SET (VOIDmode, reg,
824 gen_rtx_HIGH (Pmode, offset)));
825 emit_insn (gen_rtx_SET (VOIDmode, reg,
826 gen_rtx_LO_SUM (Pmode, reg, offset)));
827 pic_ref = gen_rtx_PLUS (Pmode,
828 pic_offset_table_rtx, reg);
832 #endif /* HAVE_lo_sum */
835 || GET_CODE (orig) == SUBREG)
841 rtx pic = pic_offset_table_rtx;
842 if (GET_CODE (pic) != REG)
844 emit_move_insn (reg, pic);
848 emit_insn (gen_rtx_USE (VOIDmode,
849 pic_offset_table_rtx));
851 if (reload_in_progress)
852 regs_ever_live[REGNO (pic)] = 1;
853 pic_ref = gen_rtx_PLUS (Pmode,
855 gen_pic_offset (orig, pic_base));
860 if (GET_CODE (pic_ref) != REG)
864 emit_move_insn (reg, pic_ref);
869 return force_reg (mode, pic_ref);
878 else if (GET_CODE (orig) == SYMBOL_REF)
881 else if (GET_CODE (orig) == PLUS
882 && (GET_CODE (XEXP (orig, 0)) == MEM
883 || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
884 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
885 && XEXP (orig, 0) != pic_offset_table_rtx
886 && GET_CODE (XEXP (orig, 1)) != REG)
890 int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM);
892 base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
893 orig = machopic_legitimize_pic_address (XEXP (orig, 1),
894 Pmode, (base == reg ? 0 : reg));
895 if (GET_CODE (orig) == CONST_INT)
897 pic_ref = plus_constant (base, INTVAL (orig));
901 pic_ref = gen_rtx_PLUS (Pmode, base, orig);
903 if (reg && is_complex)
905 emit_move_insn (reg, pic_ref);
908 /* Likewise, should we set special REG_NOTEs here? */
911 else if (GET_CODE (orig) == CONST)
913 return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
916 else if (GET_CODE (orig) == MEM
917 && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF)
919 rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
920 addr = replace_equiv_address (orig, addr);
921 emit_move_insn (reg, addr);
928 /* Output the stub or non-lazy pointer in *SLOT, if it has been used.
929 DATA is the FILE* for assembly output. Called from
933 machopic_output_indirection (void **slot, void *data)
935 machopic_indirection *p = *((machopic_indirection **) slot);
936 FILE *asm_out_file = (FILE *) data;
938 const char *sym_name;
939 const char *ptr_name;
945 sym_name = XSTR (symbol, 0);
946 ptr_name = p->ptr_name;
954 id = maybe_get_identifier (sym_name);
959 while (IDENTIFIER_TRANSPARENT_ALIAS (id))
960 id = TREE_CHAIN (id);
962 sym_name = IDENTIFIER_POINTER (id);
965 sym = alloca (strlen (sym_name) + 2);
966 if (sym_name[0] == '*' || sym_name[0] == '&')
967 strcpy (sym, sym_name + 1);
968 else if (sym_name[0] == '-' || sym_name[0] == '+')
969 strcpy (sym, sym_name);
971 sprintf (sym, "%s%s", user_label_prefix, sym_name);
973 stub = alloca (strlen (ptr_name) + 2);
974 if (ptr_name[0] == '*' || ptr_name[0] == '&')
975 strcpy (stub, ptr_name + 1);
977 sprintf (stub, "%s%s", user_label_prefix, ptr_name);
979 machopic_output_stub (asm_out_file, sym, stub);
981 else if (! indirect_data (symbol)
982 && (machopic_symbol_defined_p (symbol)
983 || SYMBOL_REF_LOCAL_P (symbol)))
985 switch_to_section (data_section);
986 assemble_align (GET_MODE_ALIGNMENT (Pmode));
987 assemble_label (ptr_name);
988 assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name),
989 GET_MODE_SIZE (Pmode),
990 GET_MODE_ALIGNMENT (Pmode), 1);
994 rtx init = const0_rtx;
996 switch_to_section (darwin_sections[machopic_nl_symbol_ptr_section]);
997 assemble_name (asm_out_file, ptr_name);
998 fprintf (asm_out_file, ":\n");
1000 fprintf (asm_out_file, "\t.indirect_symbol ");
1001 assemble_name (asm_out_file, sym_name);
1002 fprintf (asm_out_file, "\n");
1004 /* Variables that are marked with MACHO_SYMBOL_STATIC need to
1005 have their symbol name instead of 0 in the second entry of
1006 the non-lazy symbol pointer data structure when they are
1007 defined. This allows the runtime to rebind newer instances
1008 of the translation unit with the original instance of the
1011 if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC)
1012 && machopic_symbol_defined_p (symbol))
1013 init = gen_rtx_SYMBOL_REF (Pmode, sym_name);
1015 assemble_integer (init, GET_MODE_SIZE (Pmode),
1016 GET_MODE_ALIGNMENT (Pmode), 1);
1023 machopic_finish (FILE *asm_out_file)
1025 if (machopic_indirections)
1026 htab_traverse_noresize (machopic_indirections,
1027 machopic_output_indirection,
1032 machopic_operand_p (rtx op)
1034 if (MACHOPIC_JUST_INDIRECT)
1036 while (GET_CODE (op) == CONST)
1039 if (GET_CODE (op) == SYMBOL_REF)
1040 return machopic_symbol_defined_p (op);
1045 while (GET_CODE (op) == CONST)
1048 if (GET_CODE (op) == MINUS
1049 && GET_CODE (XEXP (op, 0)) == SYMBOL_REF
1050 && GET_CODE (XEXP (op, 1)) == SYMBOL_REF
1051 && machopic_symbol_defined_p (XEXP (op, 0))
1052 && machopic_symbol_defined_p (XEXP (op, 1)))
1058 /* This function records whether a given name corresponds to a defined
1059 or undefined function or variable, for machopic_classify_ident to
1063 darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
1067 /* Do the standard encoding things first. */
1068 default_encode_section_info (decl, rtl, first);
1070 if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
1073 sym_ref = XEXP (rtl, 0);
1074 if (TREE_CODE (decl) == VAR_DECL)
1075 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE;
1077 if (!DECL_EXTERNAL (decl)
1078 && (!TREE_PUBLIC (decl) || !DECL_WEAK (decl))
1079 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))
1080 && ((TREE_STATIC (decl)
1081 && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl)))
1082 || (!DECL_COMMON (decl) && DECL_INITIAL (decl)
1083 && DECL_INITIAL (decl) != error_mark_node)))
1084 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
1086 if (! TREE_PUBLIC (decl))
1087 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC;
1091 darwin_mark_decl_preserved (const char *name)
1093 fprintf (asm_out_file, ".no_dead_strip ");
1094 assemble_name (asm_out_file, name);
1095 fputc ('\n', asm_out_file);
1099 darwin_text_section (int reloc, int weak)
1103 ? darwin_sections[text_unlikely_coal_section]
1104 : unlikely_text_section ());
1107 ? darwin_sections[text_coal_section]
1112 darwin_rodata_section (int weak)
1115 ? darwin_sections[const_coal_section]
1116 : darwin_sections[const_section]);
1120 darwin_mergeable_string_section (tree exp,
1121 unsigned HOST_WIDE_INT align)
1123 if (flag_merge_constants
1124 && TREE_CODE (exp) == STRING_CST
1125 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE
1127 && ((size_t) TREE_STRING_LENGTH (exp)
1128 == strlen (TREE_STRING_POINTER (exp)) + 1))
1129 return darwin_sections[cstring_section];
1131 return readonly_data_section;
1135 darwin_mergeable_constant_section (tree exp,
1136 unsigned HOST_WIDE_INT align)
1138 enum machine_mode mode = DECL_MODE (exp);
1139 unsigned int modesize = GET_MODE_BITSIZE (mode);
1141 if (flag_merge_constants
1144 && modesize <= align
1147 && (align & (align -1)) == 0)
1149 tree size = TYPE_SIZE_UNIT (TREE_TYPE (exp));
1151 if (TREE_CODE (size) == INTEGER_CST
1152 && TREE_INT_CST_LOW (size) == 4
1153 && TREE_INT_CST_HIGH (size) == 0)
1154 return darwin_sections[literal4_section];
1155 else if (TREE_CODE (size) == INTEGER_CST
1156 && TREE_INT_CST_LOW (size) == 8
1157 && TREE_INT_CST_HIGH (size) == 0)
1158 return darwin_sections[literal8_section];
1159 else if (TARGET_64BIT
1160 && TREE_CODE (size) == INTEGER_CST
1161 && TREE_INT_CST_LOW (size) == 16
1162 && TREE_INT_CST_HIGH (size) == 0)
1163 return darwin_sections[literal16_section];
1165 return readonly_data_section;
1168 return readonly_data_section;
1172 machopic_select_section (tree decl,
1174 unsigned HOST_WIDE_INT align)
1176 bool weak = (DECL_P (decl)
1178 && (lookup_attribute ("weak", DECL_ATTRIBUTES (decl))
1179 || ! lookup_attribute ("weak_import",
1180 DECL_ATTRIBUTES (decl))));
1181 int shlib = flag_pic;
1182 section *base_section;
1184 switch (categorize_decl_for_section (decl, reloc, shlib))
1187 base_section = darwin_text_section (reloc, weak);
1191 case SECCAT_SRODATA:
1192 base_section = darwin_rodata_section (weak);
1195 case SECCAT_RODATA_MERGE_STR:
1196 base_section = darwin_mergeable_string_section (decl, align);
1199 case SECCAT_RODATA_MERGE_STR_INIT:
1200 base_section = darwin_mergeable_string_section (DECL_INITIAL (decl), align);
1203 case SECCAT_RODATA_MERGE_CONST:
1204 base_section = darwin_mergeable_constant_section (decl, align);
1208 case SECCAT_DATA_REL:
1209 case SECCAT_DATA_REL_LOCAL:
1210 case SECCAT_DATA_REL_RO:
1211 case SECCAT_DATA_REL_RO_LOCAL:
1217 if (TREE_READONLY (decl) || TREE_CONSTANT (decl))
1218 base_section = weak ? darwin_sections[const_data_coal_section]
1219 : darwin_sections[const_data_section];
1221 base_section = weak ? darwin_sections[data_coal_section] : data_section;
1228 /* Darwin weird special cases. */
1229 if (TREE_CODE (decl) == CONSTRUCTOR
1231 && TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
1232 && TYPE_NAME (TREE_TYPE (decl)))
1234 tree name = TYPE_NAME (TREE_TYPE (decl));
1235 if (TREE_CODE (name) == TYPE_DECL)
1236 name = DECL_NAME (name);
1238 if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_ObjCString"))
1240 if (flag_next_runtime)
1241 return darwin_sections[objc_constant_string_object_section];
1243 return darwin_sections[objc_string_object_section];
1246 return base_section;
1248 else if (TREE_CODE (decl) == VAR_DECL
1250 && TREE_CODE (DECL_NAME (decl)) == IDENTIFIER_NODE
1251 && IDENTIFIER_POINTER (DECL_NAME (decl))
1252 && !strncmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "_OBJC_", 6))
1254 const char *name = IDENTIFIER_POINTER (DECL_NAME (decl));
1256 if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20))
1257 return darwin_sections[objc_cls_meth_section];
1258 else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23))
1259 return darwin_sections[objc_inst_meth_section];
1260 else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20))
1261 return darwin_sections[objc_cat_cls_meth_section];
1262 else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23))
1263 return darwin_sections[objc_cat_inst_meth_section];
1264 else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22))
1265 return darwin_sections[objc_class_vars_section];
1266 else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25))
1267 return darwin_sections[objc_instance_vars_section];
1268 else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22))
1269 return darwin_sections[objc_cat_cls_meth_section];
1270 else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17))
1271 return darwin_sections[objc_class_names_section];
1272 else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20))
1273 return darwin_sections[objc_meth_var_names_section];
1274 else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20))
1275 return darwin_sections[objc_meth_var_types_section];
1276 else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22))
1277 return darwin_sections[objc_cls_refs_section];
1278 else if (!strncmp (name, "_OBJC_CLASS_", 12))
1279 return darwin_sections[objc_class_section];
1280 else if (!strncmp (name, "_OBJC_METACLASS_", 16))
1281 return darwin_sections[objc_meta_class_section];
1282 else if (!strncmp (name, "_OBJC_CATEGORY_", 15))
1283 return darwin_sections[objc_category_section];
1284 else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25))
1285 return darwin_sections[objc_selector_refs_section];
1286 else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20))
1287 return darwin_sections[objc_selector_fixup_section];
1288 else if (!strncmp (name, "_OBJC_SYMBOLS", 13))
1289 return darwin_sections[objc_symbols_section];
1290 else if (!strncmp (name, "_OBJC_MODULES", 13))
1291 return darwin_sections[objc_module_info_section];
1292 else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16))
1293 return darwin_sections[objc_image_info_section];
1294 else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32))
1295 return darwin_sections[objc_cat_inst_meth_section];
1296 else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29))
1297 return darwin_sections[objc_cat_cls_meth_section];
1298 else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20))
1299 return darwin_sections[objc_cat_cls_meth_section];
1300 else if (!strncmp (name, "_OBJC_PROTOCOL_", 15))
1301 return darwin_sections[objc_protocol_section];
1303 return base_section;
1306 return base_section;
1309 /* This can be called with address expressions as "rtx".
1310 They must go in "const". */
1313 machopic_select_rtx_section (enum machine_mode mode, rtx x,
1314 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
1316 if (GET_MODE_SIZE (mode) == 8
1317 && (GET_CODE (x) == CONST_INT
1318 || GET_CODE (x) == CONST_DOUBLE))
1319 return darwin_sections[literal8_section];
1320 else if (GET_MODE_SIZE (mode) == 4
1321 && (GET_CODE (x) == CONST_INT
1322 || GET_CODE (x) == CONST_DOUBLE))
1323 return darwin_sections[literal4_section];
1324 else if (TARGET_64BIT
1325 && GET_MODE_SIZE (mode) == 16
1326 && (GET_CODE (x) == CONST_INT
1327 || GET_CODE (x) == CONST_DOUBLE
1328 || GET_CODE (x) == CONST_VECTOR))
1329 return darwin_sections[literal16_section];
1330 else if (MACHOPIC_INDIRECT
1331 && (GET_CODE (x) == SYMBOL_REF
1332 || GET_CODE (x) == CONST
1333 || GET_CODE (x) == LABEL_REF))
1334 return darwin_sections[const_data_section];
1336 return darwin_sections[const_section];
1340 machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1342 if (MACHOPIC_INDIRECT)
1343 switch_to_section (darwin_sections[mod_init_section]);
1345 switch_to_section (darwin_sections[constructor_section]);
1346 assemble_align (POINTER_SIZE);
1347 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1349 if (! MACHOPIC_INDIRECT)
1350 fprintf (asm_out_file, ".reference .constructors_used\n");
1354 machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1356 if (MACHOPIC_INDIRECT)
1357 switch_to_section (darwin_sections[mod_term_section]);
1359 switch_to_section (darwin_sections[destructor_section]);
1360 assemble_align (POINTER_SIZE);
1361 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1363 if (! MACHOPIC_INDIRECT)
1364 fprintf (asm_out_file, ".reference .destructors_used\n");
1368 darwin_globalize_label (FILE *stream, const char *name)
1370 if (!!strncmp (name, "_OBJC_", 6))
1371 default_globalize_label (stream, name);
1375 darwin_asm_named_section (const char *name,
1376 unsigned int flags ATTRIBUTE_UNUSED,
1377 tree decl ATTRIBUTE_UNUSED)
1379 fprintf (asm_out_file, "\t.section %s\n", name);
1383 darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED)
1385 /* Darwin does not use unique sections. */
1388 /* Handle __attribute__ ((apple_kext_compatibility)).
1389 This only applies to darwin kexts for 2.95 compatibility -- it shrinks the
1390 vtable for classes with this attribute (and their descendants) by not
1391 outputting the new 3.0 nondeleting destructor. This means that such
1392 objects CANNOT be allocated on the stack or as globals UNLESS they have
1393 a completely empty `operator delete'.
1394 Luckily, this fits in with the Darwin kext model.
1396 This attribute also disables gcc3's potential overlaying of derived
1397 class data members on the padding at the end of the base class. */
1400 darwin_handle_kext_attribute (tree *node, tree name,
1401 tree args ATTRIBUTE_UNUSED,
1402 int flags ATTRIBUTE_UNUSED,
1405 /* APPLE KEXT stuff -- only applies with pure static C++ code. */
1406 if (! TARGET_KEXTABI)
1408 warning (0, "%<%s%> 2.95 vtable-compatability attribute applies "
1409 "only when compiling a kext", IDENTIFIER_POINTER (name));
1411 *no_add_attrs = true;
1413 else if (TREE_CODE (*node) != RECORD_TYPE)
1415 warning (0, "%<%s%> 2.95 vtable-compatability attribute applies "
1416 "only to C++ classes", IDENTIFIER_POINTER (name));
1418 *no_add_attrs = true;
1424 /* Handle a "weak_import" attribute; arguments as in
1425 struct attribute_spec.handler. */
1428 darwin_handle_weak_import_attribute (tree *node, tree name,
1429 tree ARG_UNUSED (args),
1430 int ARG_UNUSED (flags),
1431 bool * no_add_attrs)
1433 if (TREE_CODE (*node) != FUNCTION_DECL && TREE_CODE (*node) != VAR_DECL)
1435 warning (OPT_Wattributes, "%qs attribute ignored",
1436 IDENTIFIER_POINTER (name));
1437 *no_add_attrs = true;
1440 declare_weak (*node);
1446 no_dead_strip (FILE *file, const char *lab)
1448 fprintf (file, ".no_dead_strip %s\n", lab);
1451 /* Emit a label for an FDE, making it global and/or weak if appropriate.
1452 The third parameter is nonzero if this is for exception handling.
1453 The fourth parameter is nonzero if this is just a placeholder for an
1454 FDE that we are omitting. */
1457 darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty)
1463 if (DECL_ASSEMBLER_NAME_SET_P (decl))
1464 base = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
1466 base = IDENTIFIER_POINTER (DECL_NAME (decl));
1468 base = targetm.strip_name_encoding (base);
1469 need_quotes = name_needs_quotes (base);
1474 lab = concat (need_quotes ? "\"" : "", user_label_prefix, base, ".eh",
1475 need_quotes ? "\"" : "", NULL);
1477 if (TREE_PUBLIC (decl))
1478 fprintf (file, "\t%s %s\n",
1479 (DECL_VISIBILITY (decl) != VISIBILITY_HIDDEN
1481 : ".private_extern"),
1484 if (DECL_WEAK (decl))
1485 fprintf (file, "\t.weak_definition %s\n", lab);
1489 fprintf (file, "%s = 0\n", lab);
1491 /* Mark the absolute .eh and .eh1 style labels as needed to
1492 ensure that we don't dead code strip them and keep such
1493 labels from another instantiation point until we can fix this
1494 properly with group comdat support. */
1495 no_dead_strip (file, lab);
1498 fprintf (file, "%s:\n", lab);
1503 static GTY(()) unsigned long except_table_label_num;
1506 darwin_emit_except_table_label (FILE *file)
1508 char section_start_label[30];
1510 ASM_GENERATE_INTERNAL_LABEL (section_start_label, "GCC_except_table",
1511 except_table_label_num++);
1512 ASM_OUTPUT_LABEL (file, section_start_label);
1514 /* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */
1517 darwin_non_lazy_pcrel (FILE *file, rtx addr)
1519 const char *nlp_name;
1521 gcc_assert (GET_CODE (addr) == SYMBOL_REF);
1523 nlp_name = machopic_indirection_name (addr, /*stub_p=*/false);
1524 fputs ("\t.long\t", file);
1525 ASM_OUTPUT_LABELREF (file, nlp_name);
1529 /* Emit an assembler directive to set visibility for a symbol. The
1530 only supported visibilities are VISIBILITY_DEFAULT and
1531 VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private
1532 extern". There is no MACH-O equivalent of ELF's
1533 VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */
1536 darwin_assemble_visibility (tree decl, int vis)
1538 if (vis == VISIBILITY_DEFAULT)
1540 else if (vis == VISIBILITY_HIDDEN)
1542 fputs ("\t.private_extern ", asm_out_file);
1543 assemble_name (asm_out_file,
1544 (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))));
1545 fputs ("\n", asm_out_file);
1548 warning (OPT_Wattributes, "internal and protected visibility attributes "
1549 "not supported in this configuration; ignored");
1552 /* Output a difference of two labels that will be an assembly time
1553 constant if the two labels are local. (.long lab1-lab2 will be
1554 very different if lab1 is at the boundary between two sections; it
1555 will be relocated according to the second section, not the first,
1556 so one ends up with a difference between labels in different
1557 sections, which is bad in the dwarf2 eh context for instance.) */
1559 static int darwin_dwarf_label_counter;
1562 darwin_asm_output_dwarf_delta (FILE *file, int size,
1563 const char *lab1, const char *lab2)
1565 int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L'
1566 && lab2[0] == '*' && lab2[1] == 'L');
1567 const char *directive = (size == 8 ? ".quad" : ".long");
1570 fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter);
1572 fprintf (file, "\t%s\t", directive);
1573 assemble_name_raw (file, lab1);
1574 fprintf (file, "-");
1575 assemble_name_raw (file, lab2);
1577 fprintf (file, "\n\t%s L$set$%d", directive, darwin_dwarf_label_counter++);
1580 /* Output labels for the start of the DWARF sections if necessary. */
1582 darwin_file_start (void)
1584 if (write_symbols == DWARF2_DEBUG)
1586 static const char * const debugnames[] =
1588 DEBUG_FRAME_SECTION,
1590 DEBUG_ABBREV_SECTION,
1591 DEBUG_ARANGES_SECTION,
1592 DEBUG_MACINFO_SECTION,
1595 DEBUG_PUBNAMES_SECTION,
1596 DEBUG_PUBTYPES_SECTION,
1598 DEBUG_RANGES_SECTION
1602 for (i = 0; i < ARRAY_SIZE (debugnames); i++)
1606 switch_to_section (get_section (debugnames[i], SECTION_DEBUG, NULL));
1608 gcc_assert (strncmp (debugnames[i], "__DWARF,", 8) == 0);
1609 gcc_assert (strchr (debugnames[i] + 8, ','));
1611 namelen = strchr (debugnames[i] + 8, ',') - (debugnames[i] + 8);
1612 fprintf (asm_out_file, "Lsection%.*s:\n", namelen, debugnames[i] + 8);
1617 /* Output an offset in a DWARF section on Darwin. On Darwin, DWARF section
1618 offsets are not represented using relocs in .o files; either the
1619 section never leaves the .o file, or the linker or other tool is
1620 responsible for parsing the DWARF and updating the offsets. */
1623 darwin_asm_output_dwarf_offset (FILE *file, int size, const char * lab,
1629 gcc_assert (base->common.flags & SECTION_NAMED);
1630 gcc_assert (strncmp (base->named.name, "__DWARF,", 8) == 0);
1631 gcc_assert (strchr (base->named.name + 8, ','));
1633 namelen = strchr (base->named.name + 8, ',') - (base->named.name + 8);
1634 sprintf (sname, "*Lsection%.*s", namelen, base->named.name + 8);
1635 darwin_asm_output_dwarf_delta (file, size, lab, sname);
1639 darwin_file_end (void)
1641 machopic_finish (asm_out_file);
1642 if (strcmp (lang_hooks.name, "GNU C++") == 0)
1644 switch_to_section (darwin_sections[constructor_section]);
1645 switch_to_section (darwin_sections[destructor_section]);
1646 ASM_OUTPUT_ALIGN (asm_out_file, 1);
1648 fprintf (asm_out_file, "\t.subsections_via_symbols\n");
1651 /* TODO: Add a language hook for identifying if a decl is a vtable. */
1652 #define DARWIN_VTABLE_P(DECL) 0
1654 /* Cross-module name binding. Darwin does not support overriding
1655 functions at dynamic-link time, except for vtables in kexts. */
1658 darwin_binds_local_p (tree decl)
1660 return default_binds_local_p_1 (decl,
1661 TARGET_KEXTABI && DARWIN_VTABLE_P (decl));
1665 /* See TARGET_ASM_OUTPUT_ANCHOR for why we can't do this yet. */
1666 /* The Darwin's implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
1667 anchor relative to ".", the current section position. We cannot use
1668 the default one because ASM_OUTPUT_DEF is wrong for Darwin. */
1671 darwin_asm_output_anchor (rtx symbol)
1673 fprintf (asm_out_file, "\t.set\t");
1674 assemble_name (asm_out_file, XSTR (symbol, 0));
1675 fprintf (asm_out_file, ", . + " HOST_WIDE_INT_PRINT_DEC "\n",
1676 SYMBOL_REF_BLOCK_OFFSET (symbol));
1680 /* Set the darwin specific attributes on TYPE. */
1682 darwin_set_default_type_attributes (tree type)
1684 if (darwin_ms_struct
1685 && TREE_CODE (type) == RECORD_TYPE)
1686 TYPE_ATTRIBUTES (type) = tree_cons (get_identifier ("ms_struct"),
1688 TYPE_ATTRIBUTES (type));
1691 /* True, iff we're generating code for loadable kernel extensions. */
1694 darwin_kextabi_p (void) {
1695 return flag_apple_kext;
1699 darwin_override_options (void)
1701 if (flag_apple_kext && strcmp (lang_hooks.name, "GNU C++") != 0)
1703 warning (0, "command line option %<-fapple-kext%> is only valid for C++");
1704 flag_apple_kext = 0;
1706 if (flag_mkernel || flag_apple_kext)
1708 /* -mkernel implies -fapple-kext for C++ */
1709 if (strcmp (lang_hooks.name, "GNU C++") == 0)
1710 flag_apple_kext = 1;
1714 /* No EH in kexts. */
1715 flag_exceptions = 0;
1716 /* No -fnon-call-exceptions data in kexts. */
1717 flag_non_call_exceptions = 0;
1721 #include "gt-darwin.h"