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 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. */
79 /* Define the individual section variables. */
80 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) section *NAME;
81 #include "config/darwin-sections.def"
84 /* A get_unnamed_section callback used to switch to an ObjC section.
85 DIRECTIVE is as for output_section_asm_op. */
88 output_objc_section_asm_op (const void *directive)
90 static int been_here = 0;
95 /* written, cold -> hot */
96 switch_to_section (objc_cat_cls_meth_section);
97 switch_to_section (objc_cat_inst_meth_section);
98 switch_to_section (objc_string_object_section);
99 switch_to_section (objc_constant_string_object_section);
100 switch_to_section (objc_selector_refs_section);
101 switch_to_section (objc_selector_fixup_section);
102 switch_to_section (objc_cls_refs_section);
103 switch_to_section (objc_class_section);
104 switch_to_section (objc_meta_class_section);
105 /* shared, hot -> cold */
106 switch_to_section (objc_cls_meth_section);
107 switch_to_section (objc_inst_meth_section);
108 switch_to_section (objc_protocol_section);
109 switch_to_section (objc_class_names_section);
110 switch_to_section (objc_meth_var_types_section);
111 switch_to_section (objc_meth_var_names_section);
112 switch_to_section (objc_category_section);
113 switch_to_section (objc_class_vars_section);
114 switch_to_section (objc_instance_vars_section);
115 switch_to_section (objc_module_info_section);
116 switch_to_section (objc_symbols_section);
118 output_section_asm_op (directive);
121 /* Implement TARGET_ASM_INIT_SECTIONS. */
124 darwin_init_sections (void)
126 #define DEF_SECTION(NAME, FLAGS, DIRECTIVE, OBJC) \
127 NAME = get_unnamed_section (FLAGS, (OBJC \
128 ? output_objc_section_asm_op \
129 : output_section_asm_op), \
131 #include "darwin-sections.def"
134 readonly_data_section = const_section;
135 exception_section = darwin_exception_section;
136 eh_frame_section = darwin_eh_frame_section;
140 name_needs_quotes (const char *name)
143 while ((c = *name++) != '\0')
144 if (! ISIDNUM (c) && c != '.' && c != '$')
149 /* Return true if SYM_REF can be used without an indirection. */
151 machopic_symbol_defined_p (rtx sym_ref)
153 if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED)
156 /* If a symbol references local and is not an extern to this
157 file, then the symbol might be able to declared as defined. */
158 if (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref))
160 /* If the symbol references a variable and the variable is a
161 common symbol, then this symbol is not defined. */
162 if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_VARIABLE)
164 tree decl = SYMBOL_REF_DECL (sym_ref);
167 if (DECL_COMMON (decl))
175 /* This module assumes that (const (symbol_ref "foo")) is a legal pic
176 reference, which will not be changed. */
178 enum machopic_addr_class
179 machopic_classify_symbol (rtx sym_ref)
184 flags = SYMBOL_REF_FLAGS (sym_ref);
185 function_p = SYMBOL_REF_FUNCTION_P (sym_ref);
186 if (machopic_symbol_defined_p (sym_ref))
188 ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA);
191 ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA);
194 #ifndef TARGET_FIX_AND_CONTINUE
195 #define TARGET_FIX_AND_CONTINUE 0
198 /* Indicate when fix-and-continue style code generation is being used
199 and when a reference to data should be indirected so that it can be
200 rebound in a new translation unit to reference the original instance
201 of that data. Symbol names that are for code generation local to
202 the translation unit are bound to the new translation unit;
203 currently this means symbols that begin with L or _OBJC_;
204 otherwise, we indicate that an indirect reference should be made to
205 permit the runtime to rebind new instances of the translation unit
206 to the original instance of the data. */
209 indirect_data (rtx sym_ref)
214 /* If we aren't generating fix-and-continue code, don't do anything special. */
215 if (TARGET_FIX_AND_CONTINUE == 0)
218 /* Otherwise, all symbol except symbols that begin with L or _OBJC_
219 are indirected. Symbols that begin with L and _OBJC_ are always
220 bound to the current translation unit as they are used for
221 generated local data of the translation unit. */
223 name = XSTR (sym_ref, 0);
225 lprefix = (((name[0] == '*' || name[0] == '&')
226 && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L')))
227 || (strncmp (name, "_OBJC_", 6) == 0));
234 machopic_data_defined_p (rtx sym_ref)
236 if (indirect_data (sym_ref))
239 switch (machopic_classify_symbol (sym_ref))
241 case MACHOPIC_DEFINED_DATA:
242 case MACHOPIC_DEFINED_FUNCTION:
250 machopic_define_symbol (rtx mem)
254 gcc_assert (GET_CODE (mem) == MEM);
255 sym_ref = XEXP (mem, 0);
256 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
259 static GTY(()) char * function_base;
262 machopic_function_base_name (void)
264 /* if dynamic-no-pic is on, we should not get here */
265 gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);
267 if (function_base == NULL)
269 (char *) ggc_alloc_string ("<pic base>", sizeof ("<pic base>"));
271 current_function_uses_pic_offset_table = 1;
273 return function_base;
276 /* Return a SYMBOL_REF for the PIC function base. */
279 machopic_function_base_sym (void)
283 sym_ref = gen_rtx_SYMBOL_REF (Pmode, machopic_function_base_name ());
284 SYMBOL_REF_FLAGS (sym_ref)
285 |= (MACHO_SYMBOL_FLAG_VARIABLE | MACHO_SYMBOL_FLAG_DEFINED);
289 /* Return either ORIG or (const:P (minus:P ORIG PIC_BASE)), depending
290 on whether pic_base is NULL or not. */
292 gen_pic_offset (rtx orig, rtx pic_base)
297 return gen_rtx_CONST (Pmode, gen_rtx_MINUS (Pmode, orig, pic_base));
300 static GTY(()) const char * function_base_func_name;
301 static GTY(()) int current_pic_label_num;
304 machopic_output_function_base_name (FILE *file)
306 const char *current_name;
308 /* If dynamic-no-pic is on, we should not get here. */
309 gcc_assert (!MACHO_DYNAMIC_NO_PIC_P);
311 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
312 if (function_base_func_name != current_name)
314 ++current_pic_label_num;
315 function_base_func_name = current_name;
317 fprintf (file, "\"L%011d$pb\"", current_pic_label_num);
320 /* The suffix attached to non-lazy pointer symbols. */
321 #define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr"
322 /* The suffix attached to stub symbols. */
323 #define STUB_SUFFIX "$stub"
325 typedef struct machopic_indirection GTY (())
327 /* The SYMBOL_REF for the entity referenced. */
329 /* The name of the stub or non-lazy pointer. */
330 const char * ptr_name;
331 /* True iff this entry is for a stub (as opposed to a non-lazy
334 /* True iff this stub or pointer pointer has been referenced. */
336 } machopic_indirection;
338 /* A table mapping stub names and non-lazy pointer names to
339 SYMBOL_REFs for the stubbed-to and pointed-to entities. */
341 static GTY ((param_is (struct machopic_indirection))) htab_t
342 machopic_indirections;
344 /* Return a hash value for a SLOT in the indirections hash table. */
347 machopic_indirection_hash (const void *slot)
349 const machopic_indirection *p = (const machopic_indirection *) slot;
350 return htab_hash_string (p->ptr_name);
353 /* Returns true if the KEY is the same as that associated with
357 machopic_indirection_eq (const void *slot, const void *key)
359 return strcmp (((const machopic_indirection *) slot)->ptr_name, key) == 0;
362 /* Return the name of the non-lazy pointer (if STUB_P is false) or
363 stub (if STUB_B is true) corresponding to the given name. */
366 machopic_indirection_name (rtx sym_ref, bool stub_p)
369 const char *name = XSTR (sym_ref, 0);
370 size_t namelen = strlen (name);
371 machopic_indirection *p;
373 bool saw_star = false;
376 const char *prefix = user_label_prefix;
377 const char *quote = "";
380 id = maybe_get_identifier (name);
385 while (IDENTIFIER_TRANSPARENT_ALIAS (id))
386 id = TREE_CHAIN (id);
389 name = IDENTIFIER_POINTER (id);
390 namelen = strlen (name);
402 needs_quotes = name_needs_quotes (name);
409 suffix = STUB_SUFFIX;
411 suffix = NON_LAZY_POINTER_SUFFIX;
413 buffer = alloca (strlen ("&L")
420 /* Construct the name of the non-lazy pointer or stub. */
421 sprintf (buffer, "&%sL%s%s%s%s", quote, prefix, name, suffix, quote);
423 if (!machopic_indirections)
424 machopic_indirections = htab_create_ggc (37,
425 machopic_indirection_hash,
426 machopic_indirection_eq,
429 slot = htab_find_slot_with_hash (machopic_indirections, buffer,
430 htab_hash_string (buffer), INSERT);
433 p = (machopic_indirection *) *slot;
437 p = (machopic_indirection *) ggc_alloc (sizeof (machopic_indirection));
439 p->ptr_name = xstrdup (buffer);
448 /* Return the name of the stub for the mcount function. */
451 machopic_mcount_stub_name (void)
453 rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount");
454 return machopic_indirection_name (symbol, /*stub_p=*/true);
457 /* If NAME is the name of a stub or a non-lazy pointer , mark the stub
458 or non-lazy pointer as used -- and mark the object to which the
459 pointer/stub refers as used as well, since the pointer/stub will
460 emit a reference to it. */
463 machopic_validate_stub_or_non_lazy_ptr (const char *name)
465 machopic_indirection *p;
467 p = ((machopic_indirection *)
468 (htab_find_with_hash (machopic_indirections, name,
469 htab_hash_string (name))));
472 const char *real_name;
477 /* Do what output_addr_const will do when we actually call it. */
478 if (SYMBOL_REF_DECL (p->symbol))
479 mark_decl_referenced (SYMBOL_REF_DECL (p->symbol));
481 real_name = targetm.strip_name_encoding (XSTR (p->symbol, 0));
483 id = maybe_get_identifier (real_name);
485 mark_referenced (id);
489 /* Transform ORIG, which may be any data source, to the corresponding
490 source using indirections. */
493 machopic_indirect_data_reference (rtx orig, rtx reg)
497 if (! MACHOPIC_INDIRECT)
500 if (GET_CODE (orig) == SYMBOL_REF)
502 int defined = machopic_data_defined_p (orig);
504 if (defined && MACHO_DYNAMIC_NO_PIC_P)
506 #if defined (TARGET_TOC)
507 /* Create a new register for CSE opportunities. */
508 rtx hi_reg = (no_new_pseudos ? reg : gen_reg_rtx (Pmode));
509 emit_insn (gen_macho_high (hi_reg, orig));
510 emit_insn (gen_macho_low (reg, hi_reg, orig));
512 /* some other cpu -- writeme! */
519 #if defined (TARGET_TOC) || defined (HAVE_lo_sum)
520 rtx pic_base = machopic_function_base_sym ();
521 rtx offset = gen_pic_offset (orig, pic_base);
524 #if defined (TARGET_TOC) /* i.e., PowerPC */
525 rtx hi_sum_reg = (no_new_pseudos ? reg : gen_reg_rtx (Pmode));
529 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
530 gen_rtx_PLUS (Pmode, pic_offset_table_rtx,
531 gen_rtx_HIGH (Pmode, offset))));
532 emit_insn (gen_rtx_SET (Pmode, reg,
533 gen_rtx_LO_SUM (Pmode, hi_sum_reg, offset)));
537 #if defined (HAVE_lo_sum)
540 emit_insn (gen_rtx_SET (VOIDmode, reg,
541 gen_rtx_HIGH (Pmode, offset)));
542 emit_insn (gen_rtx_SET (VOIDmode, reg,
543 gen_rtx_LO_SUM (Pmode, reg, offset)));
544 emit_insn (gen_rtx_USE (VOIDmode, pic_offset_table_rtx));
546 orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg);
552 ptr_ref = (gen_rtx_SYMBOL_REF
554 machopic_indirection_name (orig, /*stub_p=*/false)));
556 SYMBOL_REF_DECL (ptr_ref) = SYMBOL_REF_DECL (orig);
558 ptr_ref = gen_const_mem (Pmode, ptr_ref);
559 machopic_define_symbol (ptr_ref);
563 else if (GET_CODE (orig) == CONST)
567 /* legitimize both operands of the PLUS */
568 if (GET_CODE (XEXP (orig, 0)) == PLUS)
570 base = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 0),
572 orig = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 1),
573 (base == reg ? 0 : reg));
578 if (MACHOPIC_PURE && GET_CODE (orig) == CONST_INT)
579 result = plus_constant (base, INTVAL (orig));
581 result = gen_rtx_PLUS (Pmode, base, orig);
583 if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM)
587 emit_move_insn (reg, result);
592 result = force_reg (GET_MODE (result), result);
599 else if (GET_CODE (orig) == MEM)
600 XEXP (ptr_ref, 0) = machopic_indirect_data_reference (XEXP (orig, 0), reg);
601 /* When the target is i386, this code prevents crashes due to the
602 compiler's ignorance on how to move the PIC base register to
603 other registers. (The reload phase sometimes introduces such
605 else if (GET_CODE (orig) == PLUS
606 && GET_CODE (XEXP (orig, 0)) == REG
607 && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM
609 /* Prevent the same register from being erroneously used
610 as both the base and index registers. */
611 && GET_CODE (XEXP (orig, 1)) == CONST
615 emit_move_insn (reg, XEXP (orig, 0));
616 XEXP (ptr_ref, 0) = reg;
621 /* Transform TARGET (a MEM), which is a function call target, to the
622 corresponding symbol_stub if necessary. Return a new MEM. */
625 machopic_indirect_call_target (rtx target)
627 if (GET_CODE (target) != MEM)
630 if (MACHOPIC_INDIRECT
631 && GET_CODE (XEXP (target, 0)) == SYMBOL_REF
632 && !(SYMBOL_REF_FLAGS (XEXP (target, 0))
633 & MACHO_SYMBOL_FLAG_DEFINED))
635 rtx sym_ref = XEXP (target, 0);
636 const char *stub_name = machopic_indirection_name (sym_ref,
638 enum machine_mode mode = GET_MODE (sym_ref);
639 tree decl = SYMBOL_REF_DECL (sym_ref);
641 XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name);
642 SYMBOL_REF_DECL (XEXP (target, 0)) = decl;
643 MEM_READONLY_P (target) = 1;
644 MEM_NOTRAP_P (target) = 1;
651 machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg)
655 if (! MACHOPIC_INDIRECT)
658 /* First handle a simple SYMBOL_REF or LABEL_REF */
659 if (GET_CODE (orig) == LABEL_REF
660 || (GET_CODE (orig) == SYMBOL_REF
663 /* addr(foo) = &func+(foo-func) */
666 orig = machopic_indirect_data_reference (orig, reg);
668 if (GET_CODE (orig) == PLUS
669 && GET_CODE (XEXP (orig, 0)) == REG)
672 return force_reg (mode, orig);
674 emit_move_insn (reg, orig);
678 /* if dynamic-no-pic we don't have a pic base */
679 if (MACHO_DYNAMIC_NO_PIC_P)
682 pic_base = machopic_function_base_sym ();
684 if (GET_CODE (orig) == MEM)
688 gcc_assert (!reload_in_progress);
689 reg = gen_reg_rtx (Pmode);
693 if (MACHO_DYNAMIC_NO_PIC_P
694 && (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
695 || GET_CODE (XEXP (orig, 0)) == LABEL_REF))
697 #if defined (TARGET_TOC) /* ppc */
698 rtx temp_reg = (no_new_pseudos) ? reg : gen_reg_rtx (Pmode);
699 rtx asym = XEXP (orig, 0);
702 emit_insn (gen_macho_high (temp_reg, asym));
703 mem = gen_const_mem (GET_MODE (orig),
704 gen_rtx_LO_SUM (Pmode, temp_reg, asym));
705 emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
707 /* Some other CPU -- WriteMe! but right now there are no other platform that can use dynamic-no-pic */
713 if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
714 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
716 rtx offset = gen_pic_offset (XEXP (orig, 0), pic_base);
717 #if defined (TARGET_TOC) /* i.e., PowerPC */
718 /* Generating a new reg may expose opportunities for
719 common subexpression elimination. */
720 rtx hi_sum_reg = no_new_pseudos ? reg : gen_reg_rtx (Pmode);
725 sum = gen_rtx_HIGH (Pmode, offset);
726 if (! MACHO_DYNAMIC_NO_PIC_P)
727 sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum);
729 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, sum));
731 mem = gen_const_mem (GET_MODE (orig),
732 gen_rtx_LO_SUM (Pmode,
733 hi_sum_reg, offset));
734 insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
735 REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL, pic_ref,
740 emit_insn (gen_rtx_USE (VOIDmode,
742 PIC_OFFSET_TABLE_REGNUM)));
744 emit_insn (gen_rtx_SET (VOIDmode, reg,
746 gen_rtx_CONST (Pmode,
748 emit_insn (gen_rtx_SET (VOIDmode, reg,
749 gen_rtx_LO_SUM (Pmode, reg,
750 gen_rtx_CONST (Pmode, offset))));
751 pic_ref = gen_rtx_PLUS (Pmode,
752 pic_offset_table_rtx, reg);
756 #endif /* HAVE_lo_sum */
758 rtx pic = pic_offset_table_rtx;
759 if (GET_CODE (pic) != REG)
761 emit_move_insn (reg, pic);
765 emit_insn (gen_rtx_USE (VOIDmode,
767 PIC_OFFSET_TABLE_REGNUM)));
770 pic_ref = gen_rtx_PLUS (Pmode, pic,
771 gen_pic_offset (XEXP (orig, 0),
775 #if !defined (TARGET_TOC)
776 emit_move_insn (reg, pic_ref);
777 pic_ref = gen_const_mem (GET_MODE (orig), reg);
784 if (GET_CODE (orig) == SYMBOL_REF
785 || GET_CODE (orig) == LABEL_REF)
787 rtx offset = gen_pic_offset (orig, pic_base);
788 #if defined (TARGET_TOC) /* i.e., PowerPC */
793 gcc_assert (!reload_in_progress);
794 reg = gen_reg_rtx (Pmode);
799 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
800 (MACHO_DYNAMIC_NO_PIC_P)
801 ? gen_rtx_HIGH (Pmode, offset)
802 : gen_rtx_PLUS (Pmode,
803 pic_offset_table_rtx,
806 emit_insn (gen_rtx_SET (VOIDmode, reg,
807 gen_rtx_LO_SUM (Pmode,
808 hi_sum_reg, offset)));
811 emit_insn (gen_rtx_SET (VOIDmode, reg,
812 gen_rtx_HIGH (Pmode, offset)));
813 emit_insn (gen_rtx_SET (VOIDmode, reg,
814 gen_rtx_LO_SUM (Pmode, reg, offset)));
815 pic_ref = gen_rtx_PLUS (Pmode,
816 pic_offset_table_rtx, reg);
820 #endif /* HAVE_lo_sum */
823 || GET_CODE (orig) == SUBREG)
829 rtx pic = pic_offset_table_rtx;
830 if (GET_CODE (pic) != REG)
832 emit_move_insn (reg, pic);
836 emit_insn (gen_rtx_USE (VOIDmode,
837 pic_offset_table_rtx));
839 pic_ref = gen_rtx_PLUS (Pmode,
841 gen_pic_offset (orig, pic_base));
846 if (GET_CODE (pic_ref) != REG)
850 emit_move_insn (reg, pic_ref);
855 return force_reg (mode, pic_ref);
864 else if (GET_CODE (orig) == SYMBOL_REF)
867 else if (GET_CODE (orig) == PLUS
868 && (GET_CODE (XEXP (orig, 0)) == MEM
869 || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
870 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
871 && XEXP (orig, 0) != pic_offset_table_rtx
872 && GET_CODE (XEXP (orig, 1)) != REG)
876 int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM);
878 base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
879 orig = machopic_legitimize_pic_address (XEXP (orig, 1),
880 Pmode, (base == reg ? 0 : reg));
881 if (GET_CODE (orig) == CONST_INT)
883 pic_ref = plus_constant (base, INTVAL (orig));
887 pic_ref = gen_rtx_PLUS (Pmode, base, orig);
889 if (reg && is_complex)
891 emit_move_insn (reg, pic_ref);
894 /* Likewise, should we set special REG_NOTEs here? */
897 else if (GET_CODE (orig) == CONST)
899 return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
902 else if (GET_CODE (orig) == MEM
903 && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF)
905 rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
906 addr = replace_equiv_address (orig, addr);
907 emit_move_insn (reg, addr);
914 /* Output the stub or non-lazy pointer in *SLOT, if it has been used.
915 DATA is the FILE* for assembly output. Called from
919 machopic_output_indirection (void **slot, void *data)
921 machopic_indirection *p = *((machopic_indirection **) slot);
922 FILE *asm_out_file = (FILE *) data;
924 const char *sym_name;
925 const char *ptr_name;
931 sym_name = XSTR (symbol, 0);
932 ptr_name = p->ptr_name;
940 id = maybe_get_identifier (sym_name);
945 while (IDENTIFIER_TRANSPARENT_ALIAS (id))
946 id = TREE_CHAIN (id);
948 sym_name = IDENTIFIER_POINTER (id);
951 sym = alloca (strlen (sym_name) + 2);
952 if (sym_name[0] == '*' || sym_name[0] == '&')
953 strcpy (sym, sym_name + 1);
954 else if (sym_name[0] == '-' || sym_name[0] == '+')
955 strcpy (sym, sym_name);
957 sprintf (sym, "%s%s", user_label_prefix, sym_name);
959 stub = alloca (strlen (ptr_name) + 2);
960 if (ptr_name[0] == '*' || ptr_name[0] == '&')
961 strcpy (stub, ptr_name + 1);
963 sprintf (stub, "%s%s", user_label_prefix, ptr_name);
965 machopic_output_stub (asm_out_file, sym, stub);
967 else if (! indirect_data (symbol)
968 && (machopic_symbol_defined_p (symbol)
969 || SYMBOL_REF_LOCAL_P (symbol)))
971 switch_to_section (data_section);
972 assemble_align (GET_MODE_ALIGNMENT (Pmode));
973 assemble_label (ptr_name);
974 assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name),
975 GET_MODE_SIZE (Pmode),
976 GET_MODE_ALIGNMENT (Pmode), 1);
980 rtx init = const0_rtx;
982 switch_to_section (machopic_nl_symbol_ptr_section);
983 assemble_name (asm_out_file, ptr_name);
984 fprintf (asm_out_file, ":\n");
986 fprintf (asm_out_file, "\t.indirect_symbol ");
987 assemble_name (asm_out_file, sym_name);
988 fprintf (asm_out_file, "\n");
990 /* Variables that are marked with MACHO_SYMBOL_STATIC need to
991 have their symbol name instead of 0 in the second entry of
992 the non-lazy symbol pointer data structure when they are
993 defined. This allows the runtime to rebind newer instances
994 of the translation unit with the original instance of the
997 if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC)
998 && machopic_symbol_defined_p (symbol))
999 init = gen_rtx_SYMBOL_REF (Pmode, sym_name);
1001 assemble_integer (init, GET_MODE_SIZE (Pmode),
1002 GET_MODE_ALIGNMENT (Pmode), 1);
1009 machopic_finish (FILE *asm_out_file)
1011 if (machopic_indirections)
1012 htab_traverse_noresize (machopic_indirections,
1013 machopic_output_indirection,
1018 machopic_operand_p (rtx op)
1020 if (MACHOPIC_JUST_INDIRECT)
1022 while (GET_CODE (op) == CONST)
1025 if (GET_CODE (op) == SYMBOL_REF)
1026 return machopic_symbol_defined_p (op);
1031 while (GET_CODE (op) == CONST)
1034 if (GET_CODE (op) == MINUS
1035 && GET_CODE (XEXP (op, 0)) == SYMBOL_REF
1036 && GET_CODE (XEXP (op, 1)) == SYMBOL_REF
1037 && machopic_symbol_defined_p (XEXP (op, 0))
1038 && machopic_symbol_defined_p (XEXP (op, 1)))
1044 /* This function records whether a given name corresponds to a defined
1045 or undefined function or variable, for machopic_classify_ident to
1049 darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
1053 /* Do the standard encoding things first. */
1054 default_encode_section_info (decl, rtl, first);
1056 if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
1059 sym_ref = XEXP (rtl, 0);
1060 if (TREE_CODE (decl) == VAR_DECL)
1061 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE;
1063 if (!DECL_EXTERNAL (decl)
1064 && (!TREE_PUBLIC (decl) || !DECL_WEAK (decl))
1065 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (decl))
1066 && ((TREE_STATIC (decl)
1067 && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl)))
1068 || (!DECL_COMMON (decl) && DECL_INITIAL (decl)
1069 && DECL_INITIAL (decl) != error_mark_node)))
1070 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
1072 if (! TREE_PUBLIC (decl))
1073 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC;
1077 darwin_mark_decl_preserved (const char *name)
1079 fprintf (asm_out_file, ".no_dead_strip ");
1080 assemble_name (asm_out_file, name);
1081 fputc ('\n', asm_out_file);
1085 machopic_select_section (tree exp, int reloc,
1086 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
1088 section *base_section;
1089 bool weak_p = (DECL_P (exp) && DECL_WEAK (exp)
1090 && (lookup_attribute ("weak", DECL_ATTRIBUTES (exp))
1091 || ! lookup_attribute ("weak_import",
1092 DECL_ATTRIBUTES (exp))));
1094 if (TREE_CODE (exp) == FUNCTION_DECL)
1097 || unlikely_text_section_p (last_text_section)
1098 || last_text_section == text_unlikely_coal_section)
1099 base_section = (weak_p
1100 ? text_unlikely_coal_section
1101 : unlikely_text_section ());
1103 base_section = weak_p ? text_coal_section : text_section;
1105 else if (decl_readonly_section_1 (exp, reloc, MACHOPIC_INDIRECT))
1106 base_section = weak_p ? const_coal_section : const_section;
1107 else if (TREE_READONLY (exp) || TREE_CONSTANT (exp))
1108 base_section = weak_p ? const_data_coal_section : const_data_section;
1110 base_section = weak_p ? data_coal_section : data_section;
1112 if (TREE_CODE (exp) == STRING_CST
1113 && ((size_t) TREE_STRING_LENGTH (exp)
1114 == strlen (TREE_STRING_POINTER (exp)) + 1))
1115 return cstring_section;
1116 else if ((TREE_CODE (exp) == INTEGER_CST || TREE_CODE (exp) == REAL_CST)
1117 && flag_merge_constants)
1119 tree size = TYPE_SIZE_UNIT (TREE_TYPE (exp));
1121 if (TREE_CODE (size) == INTEGER_CST &&
1122 TREE_INT_CST_LOW (size) == 4 &&
1123 TREE_INT_CST_HIGH (size) == 0)
1124 return literal4_section;
1125 else if (TREE_CODE (size) == INTEGER_CST &&
1126 TREE_INT_CST_LOW (size) == 8 &&
1127 TREE_INT_CST_HIGH (size) == 0)
1128 return literal8_section;
1130 return base_section;
1132 else if (TREE_CODE (exp) == CONSTRUCTOR
1134 && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
1135 && TYPE_NAME (TREE_TYPE (exp)))
1137 tree name = TYPE_NAME (TREE_TYPE (exp));
1138 if (TREE_CODE (name) == TYPE_DECL)
1139 name = DECL_NAME (name);
1141 if (!strcmp (IDENTIFIER_POINTER (name), "__builtin_ObjCString"))
1143 if (flag_next_runtime)
1144 return objc_constant_string_object_section;
1146 return objc_string_object_section;
1149 return base_section;
1151 else if (TREE_CODE (exp) == VAR_DECL &&
1153 TREE_CODE (DECL_NAME (exp)) == IDENTIFIER_NODE &&
1154 IDENTIFIER_POINTER (DECL_NAME (exp)) &&
1155 !strncmp (IDENTIFIER_POINTER (DECL_NAME (exp)), "_OBJC_", 6))
1157 const char *name = IDENTIFIER_POINTER (DECL_NAME (exp));
1159 if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20))
1160 return objc_cls_meth_section;
1161 else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23))
1162 return objc_inst_meth_section;
1163 else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20))
1164 return objc_cat_cls_meth_section;
1165 else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23))
1166 return objc_cat_inst_meth_section;
1167 else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22))
1168 return objc_class_vars_section;
1169 else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25))
1170 return objc_instance_vars_section;
1171 else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22))
1172 return objc_cat_cls_meth_section;
1173 else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17))
1174 return objc_class_names_section;
1175 else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20))
1176 return objc_meth_var_names_section;
1177 else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20))
1178 return objc_meth_var_types_section;
1179 else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22))
1180 return objc_cls_refs_section;
1181 else if (!strncmp (name, "_OBJC_CLASS_", 12))
1182 return objc_class_section;
1183 else if (!strncmp (name, "_OBJC_METACLASS_", 16))
1184 return objc_meta_class_section;
1185 else if (!strncmp (name, "_OBJC_CATEGORY_", 15))
1186 return objc_category_section;
1187 else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25))
1188 return objc_selector_refs_section;
1189 else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20))
1190 return objc_selector_fixup_section;
1191 else if (!strncmp (name, "_OBJC_SYMBOLS", 13))
1192 return objc_symbols_section;
1193 else if (!strncmp (name, "_OBJC_MODULES", 13))
1194 return objc_module_info_section;
1195 else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16))
1196 return objc_image_info_section;
1197 else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32))
1198 return objc_cat_inst_meth_section;
1199 else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29))
1200 return objc_cat_cls_meth_section;
1201 else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20))
1202 return objc_cat_cls_meth_section;
1203 else if (!strncmp (name, "_OBJC_PROTOCOL_", 15))
1204 return objc_protocol_section;
1206 return base_section;
1209 return base_section;
1212 /* This can be called with address expressions as "rtx".
1213 They must go in "const". */
1216 machopic_select_rtx_section (enum machine_mode mode, rtx x,
1217 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
1219 if (GET_MODE_SIZE (mode) == 8
1220 && (GET_CODE (x) == CONST_INT
1221 || GET_CODE (x) == CONST_DOUBLE))
1222 return literal8_section;
1223 else if (GET_MODE_SIZE (mode) == 4
1224 && (GET_CODE (x) == CONST_INT
1225 || GET_CODE (x) == CONST_DOUBLE))
1226 return literal4_section;
1227 else if (MACHOPIC_INDIRECT
1228 && (GET_CODE (x) == SYMBOL_REF
1229 || GET_CODE (x) == CONST
1230 || GET_CODE (x) == LABEL_REF))
1231 return const_data_section;
1233 return const_section;
1237 machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1239 if (MACHOPIC_INDIRECT)
1240 switch_to_section (mod_init_section);
1242 switch_to_section (constructor_section);
1243 assemble_align (POINTER_SIZE);
1244 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1246 if (! MACHOPIC_INDIRECT)
1247 fprintf (asm_out_file, ".reference .constructors_used\n");
1251 machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1253 if (MACHOPIC_INDIRECT)
1254 switch_to_section (mod_term_section);
1256 switch_to_section (destructor_section);
1257 assemble_align (POINTER_SIZE);
1258 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1260 if (! MACHOPIC_INDIRECT)
1261 fprintf (asm_out_file, ".reference .destructors_used\n");
1265 darwin_globalize_label (FILE *stream, const char *name)
1267 if (!!strncmp (name, "_OBJC_", 6))
1268 default_globalize_label (stream, name);
1272 darwin_asm_named_section (const char *name,
1273 unsigned int flags ATTRIBUTE_UNUSED,
1274 tree decl ATTRIBUTE_UNUSED)
1276 fprintf (asm_out_file, "\t.section %s\n", name);
1280 darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED)
1282 /* Darwin does not use unique sections. */
1285 /* Handle a "weak_import" attribute; arguments as in
1286 struct attribute_spec.handler. */
1289 darwin_handle_weak_import_attribute (tree *node, tree name,
1290 tree ARG_UNUSED (args),
1291 int ARG_UNUSED (flags),
1292 bool * no_add_attrs)
1294 if (TREE_CODE (*node) != FUNCTION_DECL && TREE_CODE (*node) != VAR_DECL)
1296 warning (OPT_Wattributes, "%qs attribute ignored",
1297 IDENTIFIER_POINTER (name));
1298 *no_add_attrs = true;
1301 declare_weak (*node);
1307 no_dead_strip (FILE *file, const char *lab)
1309 fprintf (file, ".no_dead_strip %s\n", lab);
1312 /* Emit a label for an FDE, making it global and/or weak if appropriate.
1313 The third parameter is nonzero if this is for exception handling.
1314 The fourth parameter is nonzero if this is just a placeholder for an
1315 FDE that we are omitting. */
1318 darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty)
1320 tree id = DECL_ASSEMBLER_NAME (decl)
1321 ? DECL_ASSEMBLER_NAME (decl)
1324 const char *prefix = user_label_prefix;
1326 const char *base = IDENTIFIER_POINTER (id);
1327 unsigned int base_len = IDENTIFIER_LENGTH (id);
1329 const char *suffix = ".eh";
1331 int need_quotes = name_needs_quotes (base);
1332 int quotes_len = need_quotes ? 2 : 0;
1338 lab = xmalloc (strlen (prefix)
1339 + base_len + strlen (suffix) + quotes_len + 1);
1344 strcat(lab, prefix);
1346 strcat(lab, suffix);
1350 if (TREE_PUBLIC (decl))
1351 fprintf (file, "\t%s %s\n",
1352 (DECL_VISIBILITY (decl) != VISIBILITY_HIDDEN
1354 : ".private_extern"),
1357 if (DECL_WEAK (decl))
1358 fprintf (file, "\t.weak_definition %s\n", lab);
1362 fprintf (file, "%s = 0\n", lab);
1364 /* Mark the absolute .eh and .eh1 style labels as needed to
1365 ensure that we don't dead code strip them and keep such
1366 labels from another instantiation point until we can fix this
1367 properly with group comdat support. */
1368 no_dead_strip (file, lab);
1371 fprintf (file, "%s:\n", lab);
1376 /* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */
1379 darwin_non_lazy_pcrel (FILE *file, rtx addr)
1381 const char *nlp_name;
1383 gcc_assert (GET_CODE (addr) == SYMBOL_REF);
1385 nlp_name = machopic_indirection_name (addr, /*stub_p=*/false);
1386 fputs ("\t.long\t", file);
1387 ASM_OUTPUT_LABELREF (file, nlp_name);
1391 /* Emit an assembler directive to set visibility for a symbol. The
1392 only supported visibilities are VISIBILITY_DEFAULT and
1393 VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private
1394 extern". There is no MACH-O equivalent of ELF's
1395 VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */
1398 darwin_assemble_visibility (tree decl, int vis)
1400 if (vis == VISIBILITY_DEFAULT)
1402 else if (vis == VISIBILITY_HIDDEN)
1404 fputs ("\t.private_extern ", asm_out_file);
1405 assemble_name (asm_out_file,
1406 (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))));
1407 fputs ("\n", asm_out_file);
1410 warning (OPT_Wattributes, "internal and protected visibility attributes "
1411 "not supported in this configuration; ignored");
1414 /* Output a difference of two labels that will be an assembly time
1415 constant if the two labels are local. (.long lab1-lab2 will be
1416 very different if lab1 is at the boundary between two sections; it
1417 will be relocated according to the second section, not the first,
1418 so one ends up with a difference between labels in different
1419 sections, which is bad in the dwarf2 eh context for instance.) */
1421 static int darwin_dwarf_label_counter;
1424 darwin_asm_output_dwarf_delta (FILE *file, int size,
1425 const char *lab1, const char *lab2)
1427 int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L'
1428 && lab2[0] == '*' && lab2[1] == 'L');
1429 const char *directive = (size == 8 ? ".quad" : ".long");
1432 fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter);
1434 fprintf (file, "\t%s\t", directive);
1435 assemble_name_raw (file, lab1);
1436 fprintf (file, "-");
1437 assemble_name_raw (file, lab2);
1439 fprintf (file, "\n\t%s L$set$%d", directive, darwin_dwarf_label_counter++);
1443 darwin_file_end (void)
1445 machopic_finish (asm_out_file);
1446 if (strcmp (lang_hooks.name, "GNU C++") == 0)
1448 switch_to_section (constructor_section);
1449 switch_to_section (destructor_section);
1450 ASM_OUTPUT_ALIGN (asm_out_file, 1);
1452 fprintf (asm_out_file, "\t.subsections_via_symbols\n");
1455 /* Cross-module name binding. Darwin does not support overriding
1456 functions at dynamic-link time. */
1459 darwin_binds_local_p (tree decl)
1461 return default_binds_local_p_1 (decl, 0);
1464 #include "gt-darwin.h"