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
3 Free Software Foundation, Inc.
4 Contributed by Apple Computer Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
25 #include "coretypes.h"
29 #include "hard-reg-set.h"
31 #include "insn-config.h"
32 #include "conditions.h"
33 #include "insn-flags.h"
35 #include "insn-attr.h"
42 #include "langhooks.h"
48 /* Darwin supports a feature called fix-and-continue, which is used
49 for rapid turn around debugging. When code is compiled with the
50 -mfix-and-continue flag, two changes are made to the generated code
51 that allow the system to do things that it would normally not be
52 able to do easily. These changes allow gdb to load in
53 recompilation of a translation unit that has been changed into a
54 running program and replace existing functions and methods of that
55 translation unit with with versions of those functions and methods
56 from the newly compiled translation unit. The new functions access
57 the existing static data from the old translation unit, if the data
58 existed in the unit to be replaced, and from the new translation
61 The changes are to insert 4 nops at the beginning of all functions
62 and to use indirection to get at static duration data. The 4 nops
63 are required by consumers of the generated code. Currently, gdb
64 uses this to patch in a jump to the overriding function, this
65 allows all uses of the old name to forward to the replacement,
66 including existing function pointers and virtual methods. See
67 rs6000_emit_prologue for the code that handles the nop insertions.
69 The added indirection allows gdb to redirect accesses to static
70 duration data from the newly loaded translation unit to the
71 existing data, if any. @code{static} data is special and is
72 handled by setting the second word in the .non_lazy_symbol_pointer
73 data structure to the address of the data. See indirect_data for
74 the code that handles the extra indirection, and
75 machopic_output_indirection and its use of MACHO_SYMBOL_STATIC for
76 the code that handles @code{static} data indirection. */
79 /* Nonzero if the user passes the -mone-byte-bool switch, which forces
80 sizeof(bool) to be 1. */
81 const char *darwin_one_byte_bool = 0;
84 name_needs_quotes (const char *name)
87 while ((c = *name++) != '\0')
88 if (! ISIDNUM (c) && c != '.' && c != '$')
93 /* Return true if SYM_REF can be used without an indirection. */
95 machopic_symbol_defined_p (rtx sym_ref)
97 if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED)
100 /* If a symbol references local and is not an extern to this
101 file, then the symbol might be able to declared as defined. */
102 if (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref))
104 /* If the symbol references a variable and the variable is a
105 common symbol, then this symbol is not defined. */
106 if (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_VARIABLE)
108 tree decl = SYMBOL_REF_DECL (sym_ref);
111 if (DECL_COMMON (decl))
119 /* This module assumes that (const (symbol_ref "foo")) is a legal pic
120 reference, which will not be changed. */
122 enum machopic_addr_class
123 machopic_classify_symbol (rtx sym_ref)
128 flags = SYMBOL_REF_FLAGS (sym_ref);
129 function_p = SYMBOL_REF_FUNCTION_P (sym_ref);
130 if (machopic_symbol_defined_p (sym_ref))
132 ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA);
135 ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA);
138 #ifndef TARGET_FIX_AND_CONTINUE
139 #define TARGET_FIX_AND_CONTINUE 0
142 /* Indicate when fix-and-continue style code generation is being used
143 and when a reference to data should be indirected so that it can be
144 rebound in a new translation unit to refernce the original instance
145 of that data. Symbol names that are for code generation local to
146 the translation unit are bound to the new translation unit;
147 currently this means symbols that begin with L or _OBJC_;
148 otherwise, we indicate that an indirect reference should be made to
149 permit the runtime to rebind new instances of the translation unit
150 to the original instance of the data. */
153 indirect_data (rtx sym_ref)
158 /* If we aren't generating fix-and-continue code, don't do anything special. */
159 if (TARGET_FIX_AND_CONTINUE == 0)
162 /* Otherwise, all symbol except symbols that begin with L or _OBJC_
163 are indirected. Symbols that begin with L and _OBJC_ are always
164 bound to the current translation unit as they are used for
165 generated local data of the translation unit. */
167 name = XSTR (sym_ref, 0);
169 lprefix = (((name[0] == '*' || name[0] == '&')
170 && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L')))
171 || (strncmp (name, "_OBJC_", 6)));
178 machopic_data_defined_p (rtx sym_ref)
180 if (indirect_data (sym_ref))
183 switch (machopic_classify_symbol (sym_ref))
185 case MACHOPIC_DEFINED_DATA:
186 case MACHOPIC_DEFINED_FUNCTION:
194 machopic_define_symbol (rtx mem)
197 if (GET_CODE (mem) != MEM)
199 sym_ref = XEXP (mem, 0);
200 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
203 static GTY(()) char * function_base;
206 machopic_function_base_name (void)
208 /* if dynamic-no-pic is on, we should not get here */
209 if (MACHO_DYNAMIC_NO_PIC_P)
212 if (function_base == NULL)
214 (char *) ggc_alloc_string ("<pic base>", sizeof ("<pic base>"));
216 current_function_uses_pic_offset_table = 1;
218 return function_base;
221 /* Return a SYMBOL_REF for the PIC function base. */
224 machopic_function_base_sym (void)
228 sym_ref = gen_rtx_SYMBOL_REF (Pmode, machopic_function_base_name ());
229 SYMBOL_REF_FLAGS (sym_ref)
230 |= (MACHO_SYMBOL_FLAG_VARIABLE | MACHO_SYMBOL_FLAG_DEFINED);
234 static GTY(()) const char * function_base_func_name;
235 static GTY(()) int current_pic_label_num;
238 machopic_output_function_base_name (FILE *file)
240 const char *current_name;
242 /* If dynamic-no-pic is on, we should not get here. */
243 if (MACHO_DYNAMIC_NO_PIC_P)
246 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
247 if (function_base_func_name != current_name)
249 ++current_pic_label_num;
250 function_base_func_name = current_name;
252 fprintf (file, "\"L%011d$pb\"", current_pic_label_num);
255 /* The suffix attached to non-lazy pointer symbols. */
256 #define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr"
257 /* The suffix attached to stub symbols. */
258 #define STUB_SUFFIX "$stub"
260 typedef struct machopic_indirection GTY (())
262 /* The SYMBOL_REF for the entity referenced. */
264 /* The name of the stub or non-lazy pointer. */
265 const char * ptr_name;
266 /* True iff this entry is for a stub (as opposed to a non-lazy
269 /* True iff this stub or pointer pointer has been referenced. */
271 } machopic_indirection;
273 /* A table mapping stub names and non-lazy pointer names to
274 SYMBOL_REFs for the stubbed-to and pointed-to entities. */
276 static GTY ((param_is (struct machopic_indirection))) htab_t
277 machopic_indirections;
279 /* Return a hash value for a SLOT in the indirections hash table. */
282 machopic_indirection_hash (const void *slot)
284 const machopic_indirection *p = (const machopic_indirection *) slot;
285 return htab_hash_string (p->ptr_name);
288 /* Returns true if the KEY is the same as that associated with
292 machopic_indirection_eq (const void *slot, const void *key)
294 return strcmp (((const machopic_indirection *) slot)->ptr_name, key) == 0;
297 /* Return the name of the non-lazy pointer (if STUB_P is false) or
298 stub (if STUB_B is true) corresponding to the given name. */
301 machopic_indirection_name (rtx sym_ref, bool stub_p)
304 const char *name = XSTR (sym_ref, 0);
305 size_t namelen = strlen (name);
306 machopic_indirection *p;
309 /* Construct the name of the non-lazy pointer or stub. */
312 int needs_quotes = name_needs_quotes (name);
313 buffer = alloca (strlen ("&L")
315 + strlen (STUB_SUFFIX)
316 + 2 /* possible quotes */
322 sprintf (buffer, "&\"L%s" STUB_SUFFIX "\"", name + 1);
324 sprintf (buffer, "&\"L%s%s" STUB_SUFFIX "\"", user_label_prefix,
327 else if (name[0] == '*')
328 sprintf (buffer, "&L%s" STUB_SUFFIX, name + 1);
330 sprintf (buffer, "&L%s%s" STUB_SUFFIX, user_label_prefix, name);
334 buffer = alloca (strlen ("&L")
335 + strlen (user_label_prefix)
337 + strlen (NON_LAZY_POINTER_SUFFIX)
340 sprintf (buffer, "&L%s" NON_LAZY_POINTER_SUFFIX, name + 1);
342 sprintf (buffer, "&L%s%s" NON_LAZY_POINTER_SUFFIX,
343 user_label_prefix, name);
346 if (!machopic_indirections)
347 machopic_indirections = htab_create_ggc (37,
348 machopic_indirection_hash,
349 machopic_indirection_eq,
352 slot = htab_find_slot_with_hash (machopic_indirections, buffer,
353 htab_hash_string (buffer), INSERT);
356 p = (machopic_indirection *) *slot;
360 p = (machopic_indirection *) ggc_alloc (sizeof (machopic_indirection));
362 p->ptr_name = xstrdup (buffer);
371 /* Return the name of the stub for the mcount function. */
374 machopic_mcount_stub_name (void)
376 rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount");
377 return machopic_indirection_name (symbol, /*stub_p=*/true);
380 /* If NAME is the name of a stub or a non-lazy pointer , mark the stub
381 or non-lazy pointer as used -- and mark the object to which the
382 pointer/stub refers as used as well, since the pointer/stub will
383 emit a reference to it. */
386 machopic_validate_stub_or_non_lazy_ptr (const char *name)
388 machopic_indirection *p;
390 p = ((machopic_indirection *)
391 (htab_find_with_hash (machopic_indirections, name,
392 htab_hash_string (name))));
395 const char *real_name;
400 /* Do what output_addr_const will do when we actually call it. */
401 if (SYMBOL_REF_DECL (p->symbol))
402 mark_decl_referenced (SYMBOL_REF_DECL (p->symbol));
404 real_name = targetm.strip_name_encoding (XSTR (p->symbol, 0));
406 id = maybe_get_identifier (real_name);
408 mark_referenced (id);
412 /* Transform ORIG, which may be any data source, to the corresponding
413 source using indirections. */
416 machopic_indirect_data_reference (rtx orig, rtx reg)
420 if (! MACHOPIC_INDIRECT)
423 if (GET_CODE (orig) == SYMBOL_REF)
425 int defined = machopic_data_defined_p (orig);
427 if (defined && MACHO_DYNAMIC_NO_PIC_P)
429 #if defined (TARGET_TOC)
430 emit_insn (gen_macho_high (reg, orig));
431 emit_insn (gen_macho_low (reg, reg, orig));
433 /* some other cpu -- writeme! */
440 #if defined (TARGET_TOC) || defined (HAVE_lo_sum)
441 rtx pic_base = machopic_function_base_sym ();
442 rtx offset = gen_rtx_CONST (Pmode,
443 gen_rtx_MINUS (Pmode, orig, pic_base));
446 #if defined (TARGET_TOC) /* i.e., PowerPC */
447 rtx hi_sum_reg = (no_new_pseudos ? reg : gen_reg_rtx (Pmode));
452 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
453 gen_rtx_PLUS (Pmode, pic_offset_table_rtx,
454 gen_rtx_HIGH (Pmode, offset))));
455 emit_insn (gen_rtx_SET (Pmode, reg,
456 gen_rtx_LO_SUM (Pmode, hi_sum_reg, offset)));
460 #if defined (HAVE_lo_sum)
461 if (reg == 0) abort ();
463 emit_insn (gen_rtx_SET (VOIDmode, reg,
464 gen_rtx_HIGH (Pmode, offset)));
465 emit_insn (gen_rtx_SET (VOIDmode, reg,
466 gen_rtx_LO_SUM (Pmode, reg, offset)));
467 emit_insn (gen_rtx_USE (VOIDmode, pic_offset_table_rtx));
469 orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg);
475 ptr_ref = (gen_rtx_SYMBOL_REF
477 machopic_indirection_name (orig, /*stub_p=*/false)));
479 SYMBOL_REF_DECL (ptr_ref) = SYMBOL_REF_DECL (orig);
481 ptr_ref = gen_const_mem (Pmode, ptr_ref);
482 machopic_define_symbol (ptr_ref);
486 else if (GET_CODE (orig) == CONST)
490 /* legitimize both operands of the PLUS */
491 if (GET_CODE (XEXP (orig, 0)) == PLUS)
493 base = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 0),
495 orig = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 1),
496 (base == reg ? 0 : reg));
501 if (MACHOPIC_PURE && GET_CODE (orig) == CONST_INT)
502 result = plus_constant (base, INTVAL (orig));
504 result = gen_rtx_PLUS (Pmode, base, orig);
506 if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM)
510 emit_move_insn (reg, result);
515 result = force_reg (GET_MODE (result), result);
522 else if (GET_CODE (orig) == MEM)
523 XEXP (ptr_ref, 0) = machopic_indirect_data_reference (XEXP (orig, 0), reg);
524 /* When the target is i386, this code prevents crashes due to the
525 compiler's ignorance on how to move the PIC base register to
526 other registers. (The reload phase sometimes introduces such
528 else if (GET_CODE (orig) == PLUS
529 && GET_CODE (XEXP (orig, 0)) == REG
530 && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM
532 /* Prevent the same register from being erroneously used
533 as both the base and index registers. */
534 && GET_CODE (XEXP (orig, 1)) == CONST
538 emit_move_insn (reg, XEXP (orig, 0));
539 XEXP (ptr_ref, 0) = reg;
544 /* Transform TARGET (a MEM), which is a function call target, to the
545 corresponding symbol_stub if necessary. Return a new MEM. */
548 machopic_indirect_call_target (rtx target)
550 if (GET_CODE (target) != MEM)
553 if (MACHOPIC_INDIRECT
554 && GET_CODE (XEXP (target, 0)) == SYMBOL_REF
555 && !(SYMBOL_REF_FLAGS (XEXP (target, 0))
556 & MACHO_SYMBOL_FLAG_DEFINED))
558 rtx sym_ref = XEXP (target, 0);
559 const char *stub_name = machopic_indirection_name (sym_ref,
561 enum machine_mode mode = GET_MODE (sym_ref);
562 tree decl = SYMBOL_REF_DECL (sym_ref);
564 XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name);
565 SYMBOL_REF_DECL (XEXP (target, 0)) = decl;
566 MEM_READONLY_P (target) = 1;
567 MEM_NOTRAP_P (target) = 1;
574 machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg)
578 if (! MACHOPIC_INDIRECT)
581 /* First handle a simple SYMBOL_REF or LABEL_REF */
582 if (GET_CODE (orig) == LABEL_REF
583 || (GET_CODE (orig) == SYMBOL_REF
586 /* addr(foo) = &func+(foo-func) */
589 orig = machopic_indirect_data_reference (orig, reg);
591 if (GET_CODE (orig) == PLUS
592 && GET_CODE (XEXP (orig, 0)) == REG)
595 return force_reg (mode, orig);
597 emit_move_insn (reg, orig);
601 /* if dynamic-no-pic then use 0 as the pic base */
602 if (MACHO_DYNAMIC_NO_PIC_P)
603 pic_base = CONST0_RTX (Pmode);
605 pic_base = machopic_function_base_sym ();
607 if (GET_CODE (orig) == MEM)
611 if (reload_in_progress)
614 reg = gen_reg_rtx (Pmode);
618 if (MACHO_DYNAMIC_NO_PIC_P
619 && (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
620 || GET_CODE (XEXP (orig, 0)) == LABEL_REF))
622 #if defined (TARGET_TOC) /* ppc */
623 rtx temp_reg = (no_new_pseudos) ? reg : gen_reg_rtx (Pmode);
624 rtx asym = XEXP (orig, 0);
627 emit_insn (gen_macho_high (temp_reg, asym));
628 mem = gen_const_mem (GET_MODE (orig),
629 gen_rtx_LO_SUM (Pmode, temp_reg, asym));
630 emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
632 /* Some other CPU -- WriteMe! but right now there are no other platform that can use dynamic-no-pic */
638 if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
639 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
641 rtx offset = gen_rtx_CONST (Pmode,
642 gen_rtx_MINUS (Pmode,
645 #if defined (TARGET_TOC) /* i.e., PowerPC */
646 /* Generating a new reg may expose opportunities for
647 common subexpression elimination. */
648 rtx hi_sum_reg = no_new_pseudos ? reg : gen_reg_rtx (Pmode);
653 sum = gen_rtx_HIGH (Pmode, offset);
654 if (! MACHO_DYNAMIC_NO_PIC_P)
655 sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum);
657 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, sum));
659 mem = gen_const_mem (GET_MODE (orig),
660 gen_rtx_LO_SUM (Pmode,
661 hi_sum_reg, offset));
662 insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
663 REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL, pic_ref,
668 emit_insn (gen_rtx_USE (VOIDmode,
670 PIC_OFFSET_TABLE_REGNUM)));
672 emit_insn (gen_rtx_SET (VOIDmode, reg,
674 gen_rtx_CONST (Pmode,
676 emit_insn (gen_rtx_SET (VOIDmode, reg,
677 gen_rtx_LO_SUM (Pmode, reg,
678 gen_rtx_CONST (Pmode, offset))));
679 pic_ref = gen_rtx_PLUS (Pmode,
680 pic_offset_table_rtx, reg);
684 #endif /* HAVE_lo_sum */
686 rtx pic = pic_offset_table_rtx;
687 if (GET_CODE (pic) != REG)
689 emit_move_insn (reg, pic);
693 emit_insn (gen_rtx_USE (VOIDmode,
695 PIC_OFFSET_TABLE_REGNUM)));
698 pic_ref = gen_rtx_PLUS (Pmode,
700 gen_rtx_CONST (Pmode,
701 gen_rtx_MINUS (Pmode,
706 #if !defined (TARGET_TOC)
707 emit_move_insn (reg, pic_ref);
708 pic_ref = gen_const_mem (GET_MODE (orig), reg);
715 if (GET_CODE (orig) == SYMBOL_REF
716 || GET_CODE (orig) == LABEL_REF)
718 rtx offset = gen_rtx_CONST (Pmode,
719 gen_rtx_MINUS (Pmode,
721 #if defined (TARGET_TOC) /* i.e., PowerPC */
726 if (reload_in_progress)
729 reg = gen_reg_rtx (Pmode);
734 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
735 (MACHO_DYNAMIC_NO_PIC_P)
736 ? gen_rtx_HIGH (Pmode, offset)
737 : gen_rtx_PLUS (Pmode,
738 pic_offset_table_rtx,
741 emit_insn (gen_rtx_SET (VOIDmode, reg,
742 gen_rtx_LO_SUM (Pmode,
743 hi_sum_reg, offset)));
746 emit_insn (gen_rtx_SET (VOIDmode, reg,
747 gen_rtx_HIGH (Pmode, offset)));
748 emit_insn (gen_rtx_SET (VOIDmode, reg,
749 gen_rtx_LO_SUM (Pmode, reg, offset)));
750 pic_ref = gen_rtx_PLUS (Pmode,
751 pic_offset_table_rtx, reg);
755 #endif /* HAVE_lo_sum */
758 || GET_CODE (orig) == SUBREG)
764 rtx pic = pic_offset_table_rtx;
765 if (GET_CODE (pic) != REG)
767 emit_move_insn (reg, pic);
771 emit_insn (gen_rtx_USE (VOIDmode,
772 pic_offset_table_rtx));
774 pic_ref = gen_rtx_PLUS (Pmode,
776 gen_rtx_CONST (Pmode,
777 gen_rtx_MINUS (Pmode,
783 if (GET_CODE (pic_ref) != REG)
787 emit_move_insn (reg, pic_ref);
792 return force_reg (mode, pic_ref);
801 else if (GET_CODE (orig) == SYMBOL_REF)
804 else if (GET_CODE (orig) == PLUS
805 && (GET_CODE (XEXP (orig, 0)) == MEM
806 || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
807 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
808 && XEXP (orig, 0) != pic_offset_table_rtx
809 && GET_CODE (XEXP (orig, 1)) != REG)
813 int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM);
815 base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
816 orig = machopic_legitimize_pic_address (XEXP (orig, 1),
817 Pmode, (base == reg ? 0 : reg));
818 if (GET_CODE (orig) == CONST_INT)
820 pic_ref = plus_constant (base, INTVAL (orig));
824 pic_ref = gen_rtx_PLUS (Pmode, base, orig);
826 if (reg && is_complex)
828 emit_move_insn (reg, pic_ref);
831 /* Likewise, should we set special REG_NOTEs here? */
834 else if (GET_CODE (orig) == CONST)
836 return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
839 else if (GET_CODE (orig) == MEM
840 && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF)
842 rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
843 addr = replace_equiv_address (orig, addr);
844 emit_move_insn (reg, addr);
851 /* Output the stub or non-lazy pointer in *SLOT, if it has been used.
852 DATA is the FILE* for assembly output. Called from
856 machopic_output_indirection (void **slot, void *data)
858 machopic_indirection *p = *((machopic_indirection **) slot);
859 FILE *asm_out_file = (FILE *) data;
861 const char *sym_name;
862 const char *ptr_name;
868 sym_name = XSTR (symbol, 0);
869 ptr_name = p->ptr_name;
876 sym = alloca (strlen (sym_name) + 2);
877 if (sym_name[0] == '*' || sym_name[0] == '&')
878 strcpy (sym, sym_name + 1);
879 else if (sym_name[0] == '-' || sym_name[0] == '+')
880 strcpy (sym, sym_name);
882 sprintf (sym, "%s%s", user_label_prefix, sym_name);
884 stub = alloca (strlen (ptr_name) + 2);
885 if (ptr_name[0] == '*' || ptr_name[0] == '&')
886 strcpy (stub, ptr_name + 1);
888 sprintf (stub, "%s%s", user_label_prefix, ptr_name);
890 machopic_output_stub (asm_out_file, sym, stub);
892 else if (! indirect_data (symbol)
893 && (machopic_symbol_defined_p (symbol)
894 || SYMBOL_REF_LOCAL_P (symbol)))
897 assemble_align (GET_MODE_ALIGNMENT (Pmode));
898 assemble_label (ptr_name);
899 assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name),
900 GET_MODE_SIZE (Pmode),
901 GET_MODE_ALIGNMENT (Pmode), 1);
905 rtx init = const0_rtx;
907 machopic_nl_symbol_ptr_section ();
908 assemble_name (asm_out_file, ptr_name);
909 fprintf (asm_out_file, ":\n");
911 fprintf (asm_out_file, "\t.indirect_symbol ");
912 assemble_name (asm_out_file, sym_name);
913 fprintf (asm_out_file, "\n");
915 /* Variables that are marked with MACHO_SYMBOL_STATIC need to
916 have their symbol name instead of 0 in the second entry of
917 the non-lazy symbol pointer data structure when they are
918 defined. This allows the runtime to rebind newer instances
919 of the translation unit with the original instance of the
922 if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC)
923 && machopic_symbol_defined_p (symbol))
924 init = gen_rtx_SYMBOL_REF (Pmode, sym_name);
926 assemble_integer (init, GET_MODE_SIZE (Pmode),
927 GET_MODE_ALIGNMENT (Pmode), 1);
934 machopic_finish (FILE *asm_out_file)
936 if (machopic_indirections)
937 htab_traverse_noresize (machopic_indirections,
938 machopic_output_indirection,
943 machopic_operand_p (rtx op)
945 if (MACHOPIC_JUST_INDIRECT)
947 while (GET_CODE (op) == CONST)
950 if (GET_CODE (op) == SYMBOL_REF)
951 return machopic_symbol_defined_p (op);
956 while (GET_CODE (op) == CONST)
959 if (GET_CODE (op) == MINUS
960 && GET_CODE (XEXP (op, 0)) == SYMBOL_REF
961 && GET_CODE (XEXP (op, 1)) == SYMBOL_REF
962 && machopic_symbol_defined_p (XEXP (op, 0))
963 && machopic_symbol_defined_p (XEXP (op, 1)))
969 /* This function records whether a given name corresponds to a defined
970 or undefined function or variable, for machopic_classify_ident to
974 darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
978 /* Do the standard encoding things first. */
979 default_encode_section_info (decl, rtl, first);
981 if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
984 sym_ref = XEXP (rtl, 0);
985 if (TREE_CODE (decl) == VAR_DECL)
986 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE;
988 if (!DECL_EXTERNAL (decl)
989 && (!TREE_PUBLIC (decl) || !DECL_WEAK (decl))
990 && ((TREE_STATIC (decl)
991 && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl)))
992 || (!DECL_COMMON (decl) && DECL_INITIAL (decl)
993 && DECL_INITIAL (decl) != error_mark_node)))
994 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
996 if (TREE_CODE (decl) == VAR_DECL
997 && indirect_data (sym_ref)
998 && ! TREE_PUBLIC (decl))
999 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC;
1003 darwin_mark_decl_preserved (const char *name)
1005 fprintf (asm_out_file, ".no_dead_strip ");
1006 assemble_name (asm_out_file, name);
1007 fputc ('\n', asm_out_file);
1011 machopic_select_section (tree exp, int reloc,
1012 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
1014 void (*base_function)(void);
1015 bool weak_p = DECL_P (exp) && DECL_WEAK (exp);
1016 static void (* const base_funs[][2])(void) = {
1017 { text_section, text_coal_section },
1018 { text_unlikely_section, text_unlikely_coal_section },
1019 { readonly_data_section, const_coal_section },
1020 { const_data_section, const_data_coal_section },
1021 { data_section, data_coal_section }
1024 if (TREE_CODE (exp) == FUNCTION_DECL)
1025 base_function = base_funs[reloc][weak_p];
1026 else if (decl_readonly_section_1 (exp, reloc, MACHOPIC_INDIRECT))
1027 base_function = base_funs[2][weak_p];
1028 else if (TREE_READONLY (exp) || TREE_CONSTANT (exp))
1029 base_function = base_funs[3][weak_p];
1031 base_function = base_funs[4][weak_p];
1033 if (TREE_CODE (exp) == STRING_CST
1034 && ((size_t) TREE_STRING_LENGTH (exp)
1035 == strlen (TREE_STRING_POINTER (exp)) + 1))
1037 else if ((TREE_CODE (exp) == INTEGER_CST || TREE_CODE (exp) == REAL_CST)
1038 && flag_merge_constants)
1040 tree size = TYPE_SIZE (TREE_TYPE (exp));
1042 if (TREE_CODE (size) == INTEGER_CST &&
1043 TREE_INT_CST_LOW (size) == 4 &&
1044 TREE_INT_CST_HIGH (size) == 0)
1045 literal4_section ();
1046 else if (TREE_CODE (size) == INTEGER_CST &&
1047 TREE_INT_CST_LOW (size) == 8 &&
1048 TREE_INT_CST_HIGH (size) == 0)
1049 literal8_section ();
1053 else if (TREE_CODE (exp) == CONSTRUCTOR
1055 && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
1056 && TYPE_NAME (TREE_TYPE (exp)))
1058 tree name = TYPE_NAME (TREE_TYPE (exp));
1059 if (TREE_CODE (name) == TYPE_DECL)
1060 name = DECL_NAME (name);
1061 if (!strcmp (IDENTIFIER_POINTER (name), "NSConstantString"))
1062 objc_constant_string_object_section ();
1063 else if (!strcmp (IDENTIFIER_POINTER (name), "NXConstantString"))
1064 objc_string_object_section ();
1068 else if (TREE_CODE (exp) == VAR_DECL &&
1070 TREE_CODE (DECL_NAME (exp)) == IDENTIFIER_NODE &&
1071 IDENTIFIER_POINTER (DECL_NAME (exp)) &&
1072 !strncmp (IDENTIFIER_POINTER (DECL_NAME (exp)), "_OBJC_", 6))
1074 const char *name = IDENTIFIER_POINTER (DECL_NAME (exp));
1076 if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20))
1077 objc_cls_meth_section ();
1078 else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23))
1079 objc_inst_meth_section ();
1080 else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20))
1081 objc_cat_cls_meth_section ();
1082 else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23))
1083 objc_cat_inst_meth_section ();
1084 else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22))
1085 objc_class_vars_section ();
1086 else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25))
1087 objc_instance_vars_section ();
1088 else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22))
1089 objc_cat_cls_meth_section ();
1090 else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17))
1091 objc_class_names_section ();
1092 else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20))
1093 objc_meth_var_names_section ();
1094 else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20))
1095 objc_meth_var_types_section ();
1096 else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22))
1097 objc_cls_refs_section ();
1098 else if (!strncmp (name, "_OBJC_CLASS_", 12))
1099 objc_class_section ();
1100 else if (!strncmp (name, "_OBJC_METACLASS_", 16))
1101 objc_meta_class_section ();
1102 else if (!strncmp (name, "_OBJC_CATEGORY_", 15))
1103 objc_category_section ();
1104 else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25))
1105 objc_selector_refs_section ();
1106 else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20))
1107 objc_selector_fixup_section ();
1108 else if (!strncmp (name, "_OBJC_SYMBOLS", 13))
1109 objc_symbols_section ();
1110 else if (!strncmp (name, "_OBJC_MODULES", 13))
1111 objc_module_info_section ();
1112 else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16))
1113 objc_image_info_section ();
1114 else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32))
1115 objc_cat_inst_meth_section ();
1116 else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29))
1117 objc_cat_cls_meth_section ();
1118 else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20))
1119 objc_cat_cls_meth_section ();
1120 else if (!strncmp (name, "_OBJC_PROTOCOL_", 15))
1121 objc_protocol_section ();
1125 /* ::operator new and ::operator delete must be coalesced, even
1126 if not weak. There are 8 variants that we look for. */
1127 else if (TREE_CODE (exp) == FUNCTION_DECL
1128 && ! DECL_ONE_ONLY (exp))
1130 const char * name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (exp));
1131 if (name[0] == '_' && name[1] == 'Z'
1132 && ((name[2] == 'n' && (name[3] == 'a' || name[3] == 'w')
1134 || (name[2] == 'd' && (name[3] == 'a' || name[3] == 'l')
1135 && name[4] == 'P' && name[5] == 'v')))
1137 bool delete_p = name[2] == 'd';
1138 if (name[5 + delete_p] == 0
1139 || strcmp (name + 5 + delete_p, "KSt9nothrow_t") == 0)
1140 base_funs[reloc][1] ();
1151 /* This can be called with address expressions as "rtx".
1152 They must go in "const". */
1155 machopic_select_rtx_section (enum machine_mode mode, rtx x,
1156 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
1158 if (GET_MODE_SIZE (mode) == 8)
1159 literal8_section ();
1160 else if (GET_MODE_SIZE (mode) == 4
1161 && (GET_CODE (x) == CONST_INT
1162 || GET_CODE (x) == CONST_DOUBLE))
1163 literal4_section ();
1164 else if (MACHOPIC_INDIRECT
1165 && (GET_CODE (x) == SYMBOL_REF
1166 || GET_CODE (x) == CONST
1167 || GET_CODE (x) == LABEL_REF))
1168 const_data_section ();
1174 machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1176 if (MACHOPIC_INDIRECT)
1177 mod_init_section ();
1179 constructor_section ();
1180 assemble_align (POINTER_SIZE);
1181 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1183 if (! MACHOPIC_INDIRECT)
1184 fprintf (asm_out_file, ".reference .constructors_used\n");
1188 machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1190 if (MACHOPIC_INDIRECT)
1191 mod_term_section ();
1193 destructor_section ();
1194 assemble_align (POINTER_SIZE);
1195 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1197 if (! MACHOPIC_INDIRECT)
1198 fprintf (asm_out_file, ".reference .destructors_used\n");
1202 darwin_globalize_label (FILE *stream, const char *name)
1204 if (!!strncmp (name, "_OBJC_", 6))
1205 default_globalize_label (stream, name);
1209 darwin_asm_named_section (const char *name,
1210 unsigned int flags ATTRIBUTE_UNUSED,
1211 tree decl ATTRIBUTE_UNUSED)
1213 fprintf (asm_out_file, "\t.section %s\n", name);
1217 darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED)
1219 /* Darwin does not use unique sections. */
1222 /* Handle a "weak_import" attribute; arguments as in
1223 struct attribute_spec.handler. */
1226 darwin_handle_weak_import_attribute (tree *node, tree name,
1227 tree ARG_UNUSED (args),
1228 int ARG_UNUSED (flags),
1229 bool * no_add_attrs)
1231 if (TREE_CODE (*node) != FUNCTION_DECL && TREE_CODE (*node) != VAR_DECL)
1233 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
1234 *no_add_attrs = true;
1237 declare_weak (*node);
1243 no_dead_strip (FILE *file, const char *lab)
1245 fprintf (file, ".no_dead_strip %s\n", lab);
1248 /* Emit a label for an FDE, making it global and/or weak if appropriate.
1249 The third parameter is nonzero if this is for exception handling.
1250 The fourth parameter is nonzero if this is just a placeholder for an
1251 FDE that we are omitting. */
1254 darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty)
1256 tree id = DECL_ASSEMBLER_NAME (decl)
1257 ? DECL_ASSEMBLER_NAME (decl)
1260 const char *prefix = "_";
1261 const int prefix_len = 1;
1263 const char *base = IDENTIFIER_POINTER (id);
1264 unsigned int base_len = IDENTIFIER_LENGTH (id);
1266 const char *suffix = ".eh";
1268 int need_quotes = name_needs_quotes (base);
1269 int quotes_len = need_quotes ? 2 : 0;
1275 lab = xmalloc (prefix_len + base_len + strlen (suffix) + quotes_len + 1);
1280 strcat(lab, prefix);
1282 strcat(lab, suffix);
1286 if (TREE_PUBLIC (decl))
1287 fprintf (file, "\t%s %s\n",
1288 (DECL_VISIBILITY (decl) != VISIBILITY_HIDDEN
1290 : ".private_extern"),
1293 if (DECL_WEAK (decl))
1294 fprintf (file, "\t.weak_definition %s\n", lab);
1298 fprintf (file, "%s = 0\n", lab);
1300 /* Mark the absolute .eh and .eh1 style labels as needed to
1301 ensure that we don't dead code strip them and keep such
1302 labels from another instantiation point until we can fix this
1303 properly with group comdat support. */
1304 no_dead_strip (file, lab);
1307 fprintf (file, "%s:\n", lab);
1312 /* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */
1315 darwin_non_lazy_pcrel (FILE *file, rtx addr)
1317 const char *nlp_name;
1319 if (GET_CODE (addr) != SYMBOL_REF)
1322 nlp_name = machopic_indirection_name (addr, /*stub_p=*/false);
1323 fputs ("\t.long\t", file);
1324 ASM_OUTPUT_LABELREF (file, nlp_name);
1328 /* Emit an assembler directive to set visibility for a symbol. The
1329 only supported visibilities are VISIBILITY_DEFAULT and
1330 VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private
1331 extern". There is no MACH-O equivalent of ELF's
1332 VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */
1335 darwin_assemble_visibility (tree decl, int vis)
1337 if (vis == VISIBILITY_DEFAULT)
1339 else if (vis == VISIBILITY_HIDDEN)
1341 fputs ("\t.private_extern ", asm_out_file);
1342 assemble_name (asm_out_file,
1343 (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))));
1344 fputs ("\n", asm_out_file);
1347 warning ("internal and protected visibility attributes not supported "
1348 "in this configuration; ignored");
1351 /* Output a difference of two labels that will be an assembly time
1352 constant if the two labels are local. (.long lab1-lab2 will be
1353 very different if lab1 is at the boundary between two sections; it
1354 will be relocated according to the second section, not the first,
1355 so one ends up with a difference between labels in different
1356 sections, which is bad in the dwarf2 eh context for instance.) */
1358 static int darwin_dwarf_label_counter;
1361 darwin_asm_output_dwarf_delta (FILE *file, int size,
1362 const char *lab1, const char *lab2)
1364 int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L'
1365 && lab2[0] == '*' && lab2[1] == 'L');
1366 const char *directive = (size == 8 ? ".quad" : ".long");
1369 fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter);
1371 fprintf (file, "\t%s\t", directive);
1372 assemble_name_raw (file, lab1);
1373 fprintf (file, "-");
1374 assemble_name_raw (file, lab2);
1376 fprintf (file, "\n\t%s L$set$%d", directive, darwin_dwarf_label_counter++);
1380 darwin_file_end (void)
1382 machopic_finish (asm_out_file);
1383 if (strcmp (lang_hooks.name, "GNU C++") == 0)
1385 constructor_section ();
1386 destructor_section ();
1387 ASM_OUTPUT_ALIGN (asm_out_file, 1);
1389 fprintf (asm_out_file, "\t.subsections_via_symbols\n");
1392 /* True, iff we're generating fast turn around debugging code. When
1393 true, we arrange for function prologues to start with 4 nops so
1394 that gdb may insert code to redirect them, and for data to accessed
1395 indirectly. The runtime uses this indirection to forward
1396 references for data to the original instance of that data. */
1398 int darwin_fix_and_continue;
1399 const char *darwin_fix_and_continue_switch;
1401 #include "gt-darwin.h"