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 != '$')
94 * flag_pic = 1 ... generate only indirections
95 * flag_pic = 2 ... generate indirections and pure code
99 machopic_symbol_defined_p (rtx sym_ref)
101 return (SYMBOL_REF_FLAGS (sym_ref) & MACHO_SYMBOL_FLAG_DEFINED)
102 || (SYMBOL_REF_LOCAL_P (sym_ref) && ! SYMBOL_REF_EXTERNAL_P (sym_ref));
105 /* This module assumes that (const (symbol_ref "foo")) is a legal pic
106 reference, which will not be changed. */
108 enum machopic_addr_class
109 machopic_classify_symbol (rtx sym_ref)
114 flags = SYMBOL_REF_FLAGS (sym_ref);
115 function_p = SYMBOL_REF_FUNCTION_P (sym_ref);
116 if (machopic_symbol_defined_p (sym_ref))
118 ? MACHOPIC_DEFINED_FUNCTION : MACHOPIC_DEFINED_DATA);
121 ? MACHOPIC_UNDEFINED_FUNCTION : MACHOPIC_UNDEFINED_DATA);
124 #ifndef TARGET_FIX_AND_CONTINUE
125 #define TARGET_FIX_AND_CONTINUE 0
128 /* Indicate when fix-and-continue style code generation is being used
129 and when a reference to data should be indirected so that it can be
130 rebound in a new translation unit to refernce the original instance
131 of that data. Symbol names that are for code generation local to
132 the translation unit are bound to the new translation unit;
133 currently this means symbols that begin with L or _OBJC_;
134 otherwise, we indicate that an indirect reference should be made to
135 permit the runtime to rebind new instances of the translation unit
136 to the original instance of the data. */
139 indirect_data (rtx sym_ref)
144 /* If we aren't generating fix-and-continue code, don't do anything special. */
145 if (TARGET_FIX_AND_CONTINUE == 0)
148 /* Otherwise, all symbol except symbols that begin with L or _OBJC_
149 are indirected. Symbols that begin with L and _OBJC_ are always
150 bound to the current translation unit as they are used for
151 generated local data of the translation unit. */
153 name = XSTR (sym_ref, 0);
155 lprefix = (((name[0] == '*' || name[0] == '&')
156 && (name[1] == 'L' || (name[1] == '"' && name[2] == 'L')))
157 || (strncmp (name, "_OBJC_", 6)));
164 machopic_data_defined_p (rtx sym_ref)
166 if (indirect_data (sym_ref))
169 switch (machopic_classify_symbol (sym_ref))
171 case MACHOPIC_DEFINED_DATA:
172 case MACHOPIC_DEFINED_FUNCTION:
180 machopic_define_symbol (rtx mem)
183 if (GET_CODE (mem) != MEM)
185 sym_ref = XEXP (mem, 0);
186 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
189 static GTY(()) char * function_base;
192 machopic_function_base_name (void)
194 /* if dynamic-no-pic is on, we should not get here */
195 if (MACHO_DYNAMIC_NO_PIC_P)
198 if (function_base == NULL)
200 (char *) ggc_alloc_string ("<pic base>", sizeof ("<pic base>"));
202 current_function_uses_pic_offset_table = 1;
204 return function_base;
207 /* Return a SYMBOL_REF for the PIC function base. */
210 machopic_function_base_sym (void)
214 sym_ref = gen_rtx_SYMBOL_REF (Pmode, machopic_function_base_name ());
215 SYMBOL_REF_FLAGS (sym_ref)
216 |= (MACHO_SYMBOL_FLAG_VARIABLE | MACHO_SYMBOL_FLAG_DEFINED);
220 static GTY(()) const char * function_base_func_name;
221 static GTY(()) int current_pic_label_num;
224 machopic_output_function_base_name (FILE *file)
226 const char *current_name;
228 /* If dynamic-no-pic is on, we should not get here. */
229 if (MACHO_DYNAMIC_NO_PIC_P)
232 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl));
233 if (function_base_func_name != current_name)
235 ++current_pic_label_num;
236 function_base_func_name = current_name;
238 fprintf (file, "\"L%011d$pb\"", current_pic_label_num);
241 /* The suffix attached to non-lazy pointer symbols. */
242 #define NON_LAZY_POINTER_SUFFIX "$non_lazy_ptr"
243 /* The suffix attached to stub symbols. */
244 #define STUB_SUFFIX "$stub"
246 typedef struct machopic_indirection GTY (())
248 /* The SYMBOL_REF for the entity referenced. */
250 /* The name of the stub or non-lazy pointer. */
251 const char * ptr_name;
252 /* True iff this entry is for a stub (as opposed to a non-lazy
255 /* True iff this stub or pointer pointer has been referenced. */
257 } machopic_indirection;
259 /* A table mapping stub names and non-lazy pointer names to
260 SYMBOL_REFs for the stubbed-to and pointed-to entities. */
262 static GTY ((param_is (struct machopic_indirection))) htab_t
263 machopic_indirections;
265 /* Return a hash value for a SLOT in the indirections hash table. */
268 machopic_indirection_hash (const void *slot)
270 const machopic_indirection *p = (const machopic_indirection *) slot;
271 return htab_hash_string (p->ptr_name);
274 /* Returns true if the KEY is the same as that associated with
278 machopic_indirection_eq (const void *slot, const void *key)
280 return strcmp (((const machopic_indirection *) slot)->ptr_name, key) == 0;
283 /* Return the name of the non-lazy pointer (if STUB_P is false) or
284 stub (if STUB_B is true) corresponding to the given name. */
287 machopic_indirection_name (rtx sym_ref, bool stub_p)
290 const char *name = XSTR (sym_ref, 0);
291 size_t namelen = strlen (name);
292 machopic_indirection *p;
295 /* Construct the name of the non-lazy pointer or stub. */
298 int needs_quotes = name_needs_quotes (name);
299 buffer = alloca (strlen ("&L")
301 + strlen (STUB_SUFFIX)
302 + 2 /* possible quotes */
308 sprintf (buffer, "&\"L%s" STUB_SUFFIX "\"", name + 1);
310 sprintf (buffer, "&\"L%s%s" STUB_SUFFIX "\"", user_label_prefix,
313 else if (name[0] == '*')
314 sprintf (buffer, "&L%s" STUB_SUFFIX, name + 1);
316 sprintf (buffer, "&L%s%s" STUB_SUFFIX, user_label_prefix, name);
320 buffer = alloca (strlen ("&L")
321 + strlen (user_label_prefix)
323 + strlen (NON_LAZY_POINTER_SUFFIX)
326 sprintf (buffer, "&L%s" NON_LAZY_POINTER_SUFFIX, name + 1);
328 sprintf (buffer, "&L%s%s" NON_LAZY_POINTER_SUFFIX,
329 user_label_prefix, name);
332 if (!machopic_indirections)
333 machopic_indirections = htab_create_ggc (37,
334 machopic_indirection_hash,
335 machopic_indirection_eq,
338 slot = htab_find_slot_with_hash (machopic_indirections, buffer,
339 htab_hash_string (buffer), INSERT);
342 p = (machopic_indirection *) *slot;
346 p = (machopic_indirection *) ggc_alloc (sizeof (machopic_indirection));
348 p->ptr_name = xstrdup (buffer);
357 /* Return the name of the stub for the mcount function. */
360 machopic_mcount_stub_name (void)
362 rtx symbol = gen_rtx_SYMBOL_REF (Pmode, "*mcount");
363 return machopic_indirection_name (symbol, /*stub_p=*/true);
366 /* If NAME is the name of a stub or a non-lazy pointer , mark the stub
367 or non-lazy pointer as used -- and mark the object to which the
368 pointer/stub refers as used as well, since the pointer/stub will
369 emit a reference to it. */
372 machopic_validate_stub_or_non_lazy_ptr (const char *name)
374 machopic_indirection *p;
376 p = ((machopic_indirection *)
377 (htab_find_with_hash (machopic_indirections, name,
378 htab_hash_string (name))));
381 const char *real_name;
386 /* Do what output_addr_const will do when we actually call it. */
387 if (SYMBOL_REF_DECL (p->symbol))
388 mark_decl_referenced (SYMBOL_REF_DECL (p->symbol));
390 real_name = targetm.strip_name_encoding (XSTR (p->symbol, 0));
392 id = maybe_get_identifier (real_name);
394 mark_referenced (id);
398 /* Transform ORIG, which may be any data source, to the corresponding
399 source using indirections. */
402 machopic_indirect_data_reference (rtx orig, rtx reg)
406 if (! MACHOPIC_INDIRECT)
409 if (GET_CODE (orig) == SYMBOL_REF)
411 int defined = machopic_data_defined_p (orig);
413 if (defined && MACHO_DYNAMIC_NO_PIC_P)
415 #if defined (TARGET_TOC)
416 emit_insn (gen_macho_high (reg, orig));
417 emit_insn (gen_macho_low (reg, reg, orig));
419 /* some other cpu -- writeme! */
426 #if defined (TARGET_TOC) || defined (HAVE_lo_sum)
427 rtx pic_base = machopic_function_base_sym ();
428 rtx offset = gen_rtx_CONST (Pmode,
429 gen_rtx_MINUS (Pmode, orig, pic_base));
432 #if defined (TARGET_TOC) /* i.e., PowerPC */
433 rtx hi_sum_reg = (no_new_pseudos ? reg : gen_reg_rtx (Pmode));
438 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
439 gen_rtx_PLUS (Pmode, pic_offset_table_rtx,
440 gen_rtx_HIGH (Pmode, offset))));
441 emit_insn (gen_rtx_SET (Pmode, reg,
442 gen_rtx_LO_SUM (Pmode, hi_sum_reg, offset)));
446 #if defined (HAVE_lo_sum)
447 if (reg == 0) abort ();
449 emit_insn (gen_rtx_SET (VOIDmode, reg,
450 gen_rtx_HIGH (Pmode, offset)));
451 emit_insn (gen_rtx_SET (VOIDmode, reg,
452 gen_rtx_LO_SUM (Pmode, reg, offset)));
453 emit_insn (gen_rtx_USE (VOIDmode, pic_offset_table_rtx));
455 orig = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, reg);
461 ptr_ref = (gen_rtx_SYMBOL_REF
463 machopic_indirection_name (orig, /*stub_p=*/false)));
465 SYMBOL_REF_DECL (ptr_ref) = SYMBOL_REF_DECL (orig);
467 ptr_ref = gen_const_mem (Pmode, ptr_ref);
468 machopic_define_symbol (ptr_ref);
472 else if (GET_CODE (orig) == CONST)
476 /* legitimize both operands of the PLUS */
477 if (GET_CODE (XEXP (orig, 0)) == PLUS)
479 base = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 0),
481 orig = machopic_indirect_data_reference (XEXP (XEXP (orig, 0), 1),
482 (base == reg ? 0 : reg));
487 if (MACHOPIC_PURE && GET_CODE (orig) == CONST_INT)
488 result = plus_constant (base, INTVAL (orig));
490 result = gen_rtx_PLUS (Pmode, base, orig);
492 if (MACHOPIC_JUST_INDIRECT && GET_CODE (base) == MEM)
496 emit_move_insn (reg, result);
501 result = force_reg (GET_MODE (result), result);
508 else if (GET_CODE (orig) == MEM)
509 XEXP (ptr_ref, 0) = machopic_indirect_data_reference (XEXP (orig, 0), reg);
510 /* When the target is i386, this code prevents crashes due to the
511 compiler's ignorance on how to move the PIC base register to
512 other registers. (The reload phase sometimes introduces such
514 else if (GET_CODE (orig) == PLUS
515 && GET_CODE (XEXP (orig, 0)) == REG
516 && REGNO (XEXP (orig, 0)) == PIC_OFFSET_TABLE_REGNUM
518 /* Prevent the same register from being erroneously used
519 as both the base and index registers. */
520 && GET_CODE (XEXP (orig, 1)) == CONST
524 emit_move_insn (reg, XEXP (orig, 0));
525 XEXP (ptr_ref, 0) = reg;
530 /* Transform TARGET (a MEM), which is a function call target, to the
531 corresponding symbol_stub if necessary. Return a new MEM. */
534 machopic_indirect_call_target (rtx target)
536 if (GET_CODE (target) != MEM)
539 if (MACHOPIC_INDIRECT
540 && GET_CODE (XEXP (target, 0)) == SYMBOL_REF
541 && !(SYMBOL_REF_FLAGS (XEXP (target, 0))
542 & MACHO_SYMBOL_FLAG_DEFINED))
544 rtx sym_ref = XEXP (target, 0);
545 const char *stub_name = machopic_indirection_name (sym_ref,
547 enum machine_mode mode = GET_MODE (sym_ref);
548 tree decl = SYMBOL_REF_DECL (sym_ref);
550 XEXP (target, 0) = gen_rtx_SYMBOL_REF (mode, stub_name);
551 SYMBOL_REF_DECL (XEXP (target, 0)) = decl;
552 MEM_READONLY_P (target) = 1;
553 MEM_NOTRAP_P (target) = 1;
560 machopic_legitimize_pic_address (rtx orig, enum machine_mode mode, rtx reg)
564 if (! MACHOPIC_INDIRECT)
567 /* First handle a simple SYMBOL_REF or LABEL_REF */
568 if (GET_CODE (orig) == LABEL_REF
569 || (GET_CODE (orig) == SYMBOL_REF
572 /* addr(foo) = &func+(foo-func) */
575 orig = machopic_indirect_data_reference (orig, reg);
577 if (GET_CODE (orig) == PLUS
578 && GET_CODE (XEXP (orig, 0)) == REG)
581 return force_reg (mode, orig);
583 emit_move_insn (reg, orig);
587 /* if dynamic-no-pic then use 0 as the pic base */
588 if (MACHO_DYNAMIC_NO_PIC_P)
589 pic_base = CONST0_RTX (Pmode);
591 pic_base = machopic_function_base_sym ();
593 if (GET_CODE (orig) == MEM)
597 if (reload_in_progress)
600 reg = gen_reg_rtx (Pmode);
604 if (MACHO_DYNAMIC_NO_PIC_P
605 && (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
606 || GET_CODE (XEXP (orig, 0)) == LABEL_REF))
608 #if defined (TARGET_TOC) /* ppc */
609 rtx temp_reg = (no_new_pseudos) ? reg : gen_reg_rtx (Pmode);
610 rtx asym = XEXP (orig, 0);
613 emit_insn (gen_macho_high (temp_reg, asym));
614 mem = gen_const_mem (GET_MODE (orig),
615 gen_rtx_LO_SUM (Pmode, temp_reg, asym));
616 emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
618 /* Some other CPU -- WriteMe! but right now there are no other platform that can use dynamic-no-pic */
624 if (GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
625 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
627 rtx offset = gen_rtx_CONST (Pmode,
628 gen_rtx_MINUS (Pmode,
631 #if defined (TARGET_TOC) /* i.e., PowerPC */
632 /* Generating a new reg may expose opportunities for
633 common subexpression elimination. */
634 rtx hi_sum_reg = no_new_pseudos ? reg : gen_reg_rtx (Pmode);
639 sum = gen_rtx_HIGH (Pmode, offset);
640 if (! MACHO_DYNAMIC_NO_PIC_P)
641 sum = gen_rtx_PLUS (Pmode, pic_offset_table_rtx, sum);
643 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg, sum));
645 mem = gen_const_mem (GET_MODE (orig),
646 gen_rtx_LO_SUM (Pmode,
647 hi_sum_reg, offset));
648 insn = emit_insn (gen_rtx_SET (VOIDmode, reg, mem));
649 REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL, pic_ref,
654 emit_insn (gen_rtx_USE (VOIDmode,
656 PIC_OFFSET_TABLE_REGNUM)));
658 emit_insn (gen_rtx_SET (VOIDmode, reg,
660 gen_rtx_CONST (Pmode,
662 emit_insn (gen_rtx_SET (VOIDmode, reg,
663 gen_rtx_LO_SUM (Pmode, reg,
664 gen_rtx_CONST (Pmode, offset))));
665 pic_ref = gen_rtx_PLUS (Pmode,
666 pic_offset_table_rtx, reg);
670 #endif /* HAVE_lo_sum */
672 rtx pic = pic_offset_table_rtx;
673 if (GET_CODE (pic) != REG)
675 emit_move_insn (reg, pic);
679 emit_insn (gen_rtx_USE (VOIDmode,
681 PIC_OFFSET_TABLE_REGNUM)));
684 pic_ref = gen_rtx_PLUS (Pmode,
686 gen_rtx_CONST (Pmode,
687 gen_rtx_MINUS (Pmode,
692 #if !defined (TARGET_TOC)
693 emit_move_insn (reg, pic_ref);
694 pic_ref = gen_const_mem (GET_MODE (orig), reg);
701 if (GET_CODE (orig) == SYMBOL_REF
702 || GET_CODE (orig) == LABEL_REF)
704 rtx offset = gen_rtx_CONST (Pmode,
705 gen_rtx_MINUS (Pmode,
707 #if defined (TARGET_TOC) /* i.e., PowerPC */
712 if (reload_in_progress)
715 reg = gen_reg_rtx (Pmode);
720 emit_insn (gen_rtx_SET (Pmode, hi_sum_reg,
721 (MACHO_DYNAMIC_NO_PIC_P)
722 ? gen_rtx_HIGH (Pmode, offset)
723 : gen_rtx_PLUS (Pmode,
724 pic_offset_table_rtx,
727 emit_insn (gen_rtx_SET (VOIDmode, reg,
728 gen_rtx_LO_SUM (Pmode,
729 hi_sum_reg, offset)));
732 emit_insn (gen_rtx_SET (VOIDmode, reg,
733 gen_rtx_HIGH (Pmode, offset)));
734 emit_insn (gen_rtx_SET (VOIDmode, reg,
735 gen_rtx_LO_SUM (Pmode, reg, offset)));
736 pic_ref = gen_rtx_PLUS (Pmode,
737 pic_offset_table_rtx, reg);
741 #endif /* HAVE_lo_sum */
743 if (GET_CODE (orig) == REG)
749 rtx pic = pic_offset_table_rtx;
750 if (GET_CODE (pic) != REG)
752 emit_move_insn (reg, pic);
756 emit_insn (gen_rtx_USE (VOIDmode,
757 pic_offset_table_rtx));
759 pic_ref = gen_rtx_PLUS (Pmode,
761 gen_rtx_CONST (Pmode,
762 gen_rtx_MINUS (Pmode,
768 if (GET_CODE (pic_ref) != REG)
772 emit_move_insn (reg, pic_ref);
777 return force_reg (mode, pic_ref);
786 else if (GET_CODE (orig) == SYMBOL_REF)
789 else if (GET_CODE (orig) == PLUS
790 && (GET_CODE (XEXP (orig, 0)) == MEM
791 || GET_CODE (XEXP (orig, 0)) == SYMBOL_REF
792 || GET_CODE (XEXP (orig, 0)) == LABEL_REF)
793 && XEXP (orig, 0) != pic_offset_table_rtx
794 && GET_CODE (XEXP (orig, 1)) != REG)
798 int is_complex = (GET_CODE (XEXP (orig, 0)) == MEM);
800 base = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
801 orig = machopic_legitimize_pic_address (XEXP (orig, 1),
802 Pmode, (base == reg ? 0 : reg));
803 if (GET_CODE (orig) == CONST_INT)
805 pic_ref = plus_constant (base, INTVAL (orig));
809 pic_ref = gen_rtx_PLUS (Pmode, base, orig);
811 if (reg && is_complex)
813 emit_move_insn (reg, pic_ref);
816 /* Likewise, should we set special REG_NOTEs here? */
819 else if (GET_CODE (orig) == CONST)
821 return machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
824 else if (GET_CODE (orig) == MEM
825 && GET_CODE (XEXP (orig, 0)) == SYMBOL_REF)
827 rtx addr = machopic_legitimize_pic_address (XEXP (orig, 0), Pmode, reg);
828 addr = replace_equiv_address (orig, addr);
829 emit_move_insn (reg, addr);
836 /* Output the stub or non-lazy pointer in *SLOT, if it has been used.
837 DATA is the FILE* for assembly output. Called from
841 machopic_output_indirection (void **slot, void *data)
843 machopic_indirection *p = *((machopic_indirection **) slot);
844 FILE *asm_out_file = (FILE *) data;
846 const char *sym_name;
847 const char *ptr_name;
853 sym_name = XSTR (symbol, 0);
854 ptr_name = p->ptr_name;
861 sym = alloca (strlen (sym_name) + 2);
862 if (sym_name[0] == '*' || sym_name[0] == '&')
863 strcpy (sym, sym_name + 1);
864 else if (sym_name[0] == '-' || sym_name[0] == '+')
865 strcpy (sym, sym_name);
867 sprintf (sym, "%s%s", user_label_prefix, sym_name);
869 stub = alloca (strlen (ptr_name) + 2);
870 if (ptr_name[0] == '*' || ptr_name[0] == '&')
871 strcpy (stub, ptr_name + 1);
873 sprintf (stub, "%s%s", user_label_prefix, ptr_name);
875 machopic_output_stub (asm_out_file, sym, stub);
877 else if (! indirect_data (symbol)
878 && (machopic_symbol_defined_p (symbol)
879 || SYMBOL_REF_LOCAL_P (symbol)))
882 assemble_align (GET_MODE_ALIGNMENT (Pmode));
883 assemble_label (ptr_name);
884 assemble_integer (gen_rtx_SYMBOL_REF (Pmode, sym_name),
885 GET_MODE_SIZE (Pmode),
886 GET_MODE_ALIGNMENT (Pmode), 1);
890 rtx init = const0_rtx;
892 machopic_nl_symbol_ptr_section ();
893 assemble_name (asm_out_file, ptr_name);
894 fprintf (asm_out_file, ":\n");
896 fprintf (asm_out_file, "\t.indirect_symbol ");
897 assemble_name (asm_out_file, sym_name);
898 fprintf (asm_out_file, "\n");
900 /* Variables that are marked with MACHO_SYMBOL_STATIC need to
901 have their symbol name instead of 0 in the second entry of
902 the non-lazy symbol pointer data structure when they are
903 defined. This allows the runtime to rebind newer instances
904 of the translation unit with the original instance of the
907 if ((SYMBOL_REF_FLAGS (symbol) & MACHO_SYMBOL_STATIC)
908 && machopic_symbol_defined_p (symbol))
909 init = gen_rtx_SYMBOL_REF (Pmode, sym_name);
911 assemble_integer (init, GET_MODE_SIZE (Pmode),
912 GET_MODE_ALIGNMENT (Pmode), 1);
919 machopic_finish (FILE *asm_out_file)
921 if (machopic_indirections)
922 htab_traverse_noresize (machopic_indirections,
923 machopic_output_indirection,
928 machopic_operand_p (rtx op)
930 if (MACHOPIC_JUST_INDIRECT)
932 while (GET_CODE (op) == CONST)
935 if (GET_CODE (op) == SYMBOL_REF)
936 return machopic_symbol_defined_p (op);
941 while (GET_CODE (op) == CONST)
944 if (GET_CODE (op) == MINUS
945 && GET_CODE (XEXP (op, 0)) == SYMBOL_REF
946 && GET_CODE (XEXP (op, 1)) == SYMBOL_REF
947 && machopic_symbol_defined_p (XEXP (op, 0))
948 && machopic_symbol_defined_p (XEXP (op, 1)))
954 /* This function records whether a given name corresponds to a defined
955 or undefined function or variable, for machopic_classify_ident to
959 darwin_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
963 /* Do the standard encoding things first. */
964 default_encode_section_info (decl, rtl, first);
966 if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
969 sym_ref = XEXP (rtl, 0);
970 if (TREE_CODE (decl) == VAR_DECL)
971 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_VARIABLE;
973 if (!DECL_EXTERNAL (decl)
974 && (!TREE_PUBLIC (decl) || !DECL_WEAK (decl))
975 && ((TREE_STATIC (decl)
976 && (!DECL_COMMON (decl) || !TREE_PUBLIC (decl)))
977 || (!DECL_COMMON (decl) && DECL_INITIAL (decl)
978 && DECL_INITIAL (decl) != error_mark_node)))
979 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_FLAG_DEFINED;
981 if (TREE_CODE (decl) == VAR_DECL
982 && indirect_data (sym_ref)
983 && ! TREE_PUBLIC (decl))
984 SYMBOL_REF_FLAGS (sym_ref) |= MACHO_SYMBOL_STATIC;
988 darwin_mark_decl_preserved (const char *name)
990 fprintf (asm_out_file, ".no_dead_strip ");
991 assemble_name (asm_out_file, name);
992 fputc ('\n', asm_out_file);
996 machopic_select_section (tree exp, int reloc,
997 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
999 void (*base_function)(void);
1000 bool weak_p = DECL_P (exp) && DECL_WEAK (exp);
1001 static void (* const base_funs[][2])(void) = {
1002 { text_section, text_coal_section },
1003 { text_unlikely_section, text_unlikely_coal_section },
1004 { readonly_data_section, const_coal_section },
1005 { const_data_section, const_data_coal_section },
1006 { data_section, data_coal_section }
1009 if (TREE_CODE (exp) == FUNCTION_DECL)
1010 base_function = base_funs[reloc][weak_p];
1011 else if (decl_readonly_section_1 (exp, reloc, MACHOPIC_INDIRECT))
1012 base_function = base_funs[2][weak_p];
1013 else if (TREE_READONLY (exp) || TREE_CONSTANT (exp))
1014 base_function = base_funs[3][weak_p];
1016 base_function = base_funs[4][weak_p];
1018 if (TREE_CODE (exp) == STRING_CST
1019 && ((size_t) TREE_STRING_LENGTH (exp)
1020 == strlen (TREE_STRING_POINTER (exp)) + 1))
1022 else if ((TREE_CODE (exp) == INTEGER_CST || TREE_CODE (exp) == REAL_CST)
1023 && flag_merge_constants)
1025 tree size = TYPE_SIZE (TREE_TYPE (exp));
1027 if (TREE_CODE (size) == INTEGER_CST &&
1028 TREE_INT_CST_LOW (size) == 4 &&
1029 TREE_INT_CST_HIGH (size) == 0)
1030 literal4_section ();
1031 else if (TREE_CODE (size) == INTEGER_CST &&
1032 TREE_INT_CST_LOW (size) == 8 &&
1033 TREE_INT_CST_HIGH (size) == 0)
1034 literal8_section ();
1038 else if (TREE_CODE (exp) == CONSTRUCTOR
1040 && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
1041 && TYPE_NAME (TREE_TYPE (exp)))
1043 tree name = TYPE_NAME (TREE_TYPE (exp));
1044 if (TREE_CODE (name) == TYPE_DECL)
1045 name = DECL_NAME (name);
1046 if (!strcmp (IDENTIFIER_POINTER (name), "NSConstantString"))
1047 objc_constant_string_object_section ();
1048 else if (!strcmp (IDENTIFIER_POINTER (name), "NXConstantString"))
1049 objc_string_object_section ();
1053 else if (TREE_CODE (exp) == VAR_DECL &&
1055 TREE_CODE (DECL_NAME (exp)) == IDENTIFIER_NODE &&
1056 IDENTIFIER_POINTER (DECL_NAME (exp)) &&
1057 !strncmp (IDENTIFIER_POINTER (DECL_NAME (exp)), "_OBJC_", 6))
1059 const char *name = IDENTIFIER_POINTER (DECL_NAME (exp));
1061 if (!strncmp (name, "_OBJC_CLASS_METHODS_", 20))
1062 objc_cls_meth_section ();
1063 else if (!strncmp (name, "_OBJC_INSTANCE_METHODS_", 23))
1064 objc_inst_meth_section ();
1065 else if (!strncmp (name, "_OBJC_CATEGORY_CLASS_METHODS_", 20))
1066 objc_cat_cls_meth_section ();
1067 else if (!strncmp (name, "_OBJC_CATEGORY_INSTANCE_METHODS_", 23))
1068 objc_cat_inst_meth_section ();
1069 else if (!strncmp (name, "_OBJC_CLASS_VARIABLES_", 22))
1070 objc_class_vars_section ();
1071 else if (!strncmp (name, "_OBJC_INSTANCE_VARIABLES_", 25))
1072 objc_instance_vars_section ();
1073 else if (!strncmp (name, "_OBJC_CLASS_PROTOCOLS_", 22))
1074 objc_cat_cls_meth_section ();
1075 else if (!strncmp (name, "_OBJC_CLASS_NAME_", 17))
1076 objc_class_names_section ();
1077 else if (!strncmp (name, "_OBJC_METH_VAR_NAME_", 20))
1078 objc_meth_var_names_section ();
1079 else if (!strncmp (name, "_OBJC_METH_VAR_TYPE_", 20))
1080 objc_meth_var_types_section ();
1081 else if (!strncmp (name, "_OBJC_CLASS_REFERENCES", 22))
1082 objc_cls_refs_section ();
1083 else if (!strncmp (name, "_OBJC_CLASS_", 12))
1084 objc_class_section ();
1085 else if (!strncmp (name, "_OBJC_METACLASS_", 16))
1086 objc_meta_class_section ();
1087 else if (!strncmp (name, "_OBJC_CATEGORY_", 15))
1088 objc_category_section ();
1089 else if (!strncmp (name, "_OBJC_SELECTOR_REFERENCES", 25))
1090 objc_selector_refs_section ();
1091 else if (!strncmp (name, "_OBJC_SELECTOR_FIXUP", 20))
1092 objc_selector_fixup_section ();
1093 else if (!strncmp (name, "_OBJC_SYMBOLS", 13))
1094 objc_symbols_section ();
1095 else if (!strncmp (name, "_OBJC_MODULES", 13))
1096 objc_module_info_section ();
1097 else if (!strncmp (name, "_OBJC_IMAGE_INFO", 16))
1098 objc_image_info_section ();
1099 else if (!strncmp (name, "_OBJC_PROTOCOL_INSTANCE_METHODS_", 32))
1100 objc_cat_inst_meth_section ();
1101 else if (!strncmp (name, "_OBJC_PROTOCOL_CLASS_METHODS_", 29))
1102 objc_cat_cls_meth_section ();
1103 else if (!strncmp (name, "_OBJC_PROTOCOL_REFS_", 20))
1104 objc_cat_cls_meth_section ();
1105 else if (!strncmp (name, "_OBJC_PROTOCOL_", 15))
1106 objc_protocol_section ();
1110 /* ::operator new and ::operator delete must be coalesced, even
1111 if not weak. There are 8 variants that we look for. */
1112 else if (TREE_CODE (exp) == FUNCTION_DECL
1113 && ! DECL_ONE_ONLY (exp))
1115 const char * name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (exp));
1116 if (name[0] == '_' && name[1] == 'Z'
1117 && ((name[2] == 'n' && (name[3] == 'a' || name[3] == 'w')
1119 || (name[2] == 'd' && (name[3] == 'a' || name[3] == 'l')
1120 && name[4] == 'P' && name[5] == 'v')))
1122 bool delete_p = name[2] == 'd';
1123 if (name[5 + delete_p] == 0
1124 || strcmp (name + 5 + delete_p, "KSt9nothrow_t") == 0)
1125 base_funs[reloc][1] ();
1136 /* This can be called with address expressions as "rtx".
1137 They must go in "const". */
1140 machopic_select_rtx_section (enum machine_mode mode, rtx x,
1141 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
1143 if (GET_MODE_SIZE (mode) == 8)
1144 literal8_section ();
1145 else if (GET_MODE_SIZE (mode) == 4
1146 && (GET_CODE (x) == CONST_INT
1147 || GET_CODE (x) == CONST_DOUBLE))
1148 literal4_section ();
1149 else if (MACHOPIC_INDIRECT
1150 && (GET_CODE (x) == SYMBOL_REF
1151 || GET_CODE (x) == CONST
1152 || GET_CODE (x) == LABEL_REF))
1153 const_data_section ();
1159 machopic_asm_out_constructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1161 if (MACHOPIC_INDIRECT)
1162 mod_init_section ();
1164 constructor_section ();
1165 assemble_align (POINTER_SIZE);
1166 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1168 if (! MACHOPIC_INDIRECT)
1169 fprintf (asm_out_file, ".reference .constructors_used\n");
1173 machopic_asm_out_destructor (rtx symbol, int priority ATTRIBUTE_UNUSED)
1175 if (MACHOPIC_INDIRECT)
1176 mod_term_section ();
1178 destructor_section ();
1179 assemble_align (POINTER_SIZE);
1180 assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
1182 if (! MACHOPIC_INDIRECT)
1183 fprintf (asm_out_file, ".reference .destructors_used\n");
1187 darwin_globalize_label (FILE *stream, const char *name)
1189 if (!!strncmp (name, "_OBJC_", 6))
1190 default_globalize_label (stream, name);
1194 darwin_asm_named_section (const char *name,
1195 unsigned int flags ATTRIBUTE_UNUSED,
1196 tree decl ATTRIBUTE_UNUSED)
1198 fprintf (asm_out_file, "\t.section %s\n", name);
1202 darwin_unique_section (tree decl ATTRIBUTE_UNUSED, int reloc ATTRIBUTE_UNUSED)
1204 /* Darwin does not use unique sections. */
1207 /* Handle a "weak_import" attribute; arguments as in
1208 struct attribute_spec.handler. */
1211 darwin_handle_weak_import_attribute (tree *node, tree name,
1212 tree ARG_UNUSED (args),
1213 int ARG_UNUSED (flags),
1214 bool * no_add_attrs)
1216 if (TREE_CODE (*node) != FUNCTION_DECL)
1218 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name));
1219 *no_add_attrs = true;
1222 declare_weak (*node);
1228 no_dead_strip (FILE *file, const char *lab)
1230 fprintf (file, ".no_dead_strip %s\n", lab);
1233 /* Emit a label for an FDE, making it global and/or weak if appropriate.
1234 The third parameter is nonzero if this is for exception handling.
1235 The fourth parameter is nonzero if this is just a placeholder for an
1236 FDE that we are omitting. */
1239 darwin_emit_unwind_label (FILE *file, tree decl, int for_eh, int empty)
1241 tree id = DECL_ASSEMBLER_NAME (decl)
1242 ? DECL_ASSEMBLER_NAME (decl)
1245 const char *prefix = "_";
1246 const int prefix_len = 1;
1248 const char *base = IDENTIFIER_POINTER (id);
1249 unsigned int base_len = IDENTIFIER_LENGTH (id);
1251 const char *suffix = ".eh";
1253 int need_quotes = name_needs_quotes (base);
1254 int quotes_len = need_quotes ? 2 : 0;
1260 lab = xmalloc (prefix_len + base_len + strlen (suffix) + quotes_len + 1);
1265 strcat(lab, prefix);
1267 strcat(lab, suffix);
1271 if (TREE_PUBLIC (decl))
1272 fprintf (file, "\t%s %s\n",
1273 (DECL_VISIBILITY (decl) != VISIBILITY_HIDDEN
1275 : ".private_extern"),
1278 if (DECL_WEAK (decl))
1279 fprintf (file, "\t.weak_definition %s\n", lab);
1283 fprintf (file, "%s = 0\n", lab);
1285 /* Mark the absolute .eh and .eh1 style labels as needed to
1286 ensure that we don't dead code strip them and keep such
1287 labels from another instantiation point until we can fix this
1288 properly with group comdat support. */
1289 no_dead_strip (file, lab);
1292 fprintf (file, "%s:\n", lab);
1297 /* Generate a PC-relative reference to a Mach-O non-lazy-symbol. */
1300 darwin_non_lazy_pcrel (FILE *file, rtx addr)
1302 const char *nlp_name;
1304 if (GET_CODE (addr) != SYMBOL_REF)
1307 nlp_name = machopic_indirection_name (addr, /*stub_p=*/false);
1308 fputs ("\t.long\t", file);
1309 ASM_OUTPUT_LABELREF (file, nlp_name);
1313 /* Emit an assembler directive to set visibility for a symbol. The
1314 only supported visibilities are VISIBILITY_DEFAULT and
1315 VISIBILITY_HIDDEN; the latter corresponds to Darwin's "private
1316 extern". There is no MACH-O equivalent of ELF's
1317 VISIBILITY_INTERNAL or VISIBILITY_PROTECTED. */
1320 darwin_assemble_visibility (tree decl, int vis)
1322 if (vis == VISIBILITY_DEFAULT)
1324 else if (vis == VISIBILITY_HIDDEN)
1326 fputs ("\t.private_extern ", asm_out_file);
1327 assemble_name (asm_out_file,
1328 (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))));
1329 fputs ("\n", asm_out_file);
1332 warning ("internal and protected visibility attributes not supported "
1333 "in this configuration; ignored");
1336 /* Output a difference of two labels that will be an assembly time
1337 constant if the two labels are local. (.long lab1-lab2 will be
1338 very different if lab1 is at the boundary between two sections; it
1339 will be relocated according to the second section, not the first,
1340 so one ends up with a difference between labels in different
1341 sections, which is bad in the dwarf2 eh context for instance.) */
1343 static int darwin_dwarf_label_counter;
1346 darwin_asm_output_dwarf_delta (FILE *file, int size ATTRIBUTE_UNUSED,
1347 const char *lab1, const char *lab2)
1349 int islocaldiff = (lab1[0] == '*' && lab1[1] == 'L'
1350 && lab2[0] == '*' && lab2[1] == 'L');
1353 fprintf (file, "\t.set L$set$%d,", darwin_dwarf_label_counter);
1355 fprintf (file, "\t%s\t", ".long");
1356 assemble_name (file, lab1);
1357 fprintf (file, "-");
1358 assemble_name (file, lab2);
1360 fprintf (file, "\n\t.long L$set$%d", darwin_dwarf_label_counter++);
1364 darwin_file_end (void)
1366 machopic_finish (asm_out_file);
1367 if (strcmp (lang_hooks.name, "GNU C++") == 0)
1369 constructor_section ();
1370 destructor_section ();
1371 ASM_OUTPUT_ALIGN (asm_out_file, 1);
1373 fprintf (asm_out_file, "\t.subsections_via_symbols\n");
1376 /* True, iff we're generating fast turn around debugging code. When
1377 true, we arrange for function prologues to start with 4 nops so
1378 that gdb may insert code to redirect them, and for data to accessed
1379 indirectly. The runtime uses this indirection to forward
1380 references for data to the original instance of that data. */
1382 int darwin_fix_and_continue;
1383 const char *darwin_fix_and_continue_switch;
1385 #include "gt-darwin.h"