gcc/config/i386/darwin.h

   1 /* Target definitions for x86 running Darwin.
   2    Copyright (C) 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
   3    Contributed by Apple Computer Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22 /* Enable Mach-O bits in generic x86 code.  */
  23 #undef TARGET_MACHO
  24 #define TARGET_MACHO 1
  25
  26 #define TARGET_VERSION fprintf (stderr, " (i686 Darwin)");
  27
  28 #undef TARGET_FPMATH_DEFAULT
  29 #define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387)
  30
  31 #define TARGET_OS_CPP_BUILTINS()                \
  32   do                                            \
  33     {                                           \
  34       builtin_define ("__i386__");              \
  35       builtin_define ("__LITTLE_ENDIAN__");     \
  36       darwin_cpp_builtins (pfile);              \
  37     }                                           \
  38   while (0)
  39
  40 /* We want -fPIC by default, unless we're using -static to compile for
  41    the kernel or some such.  */
  42
  43 #undef CC1_SPEC
  44 #define CC1_SPEC "%{!static:-fPIC}\
  45   %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }}"
  46
  47 #undef ASM_SPEC
  48 #define ASM_SPEC "-arch i386 -force_cpusubtype_ALL"
  49
  50 #undef SUBTARGET_EXTRA_SPECS
  51 #define SUBTARGET_EXTRA_SPECS                                   \
  52   { "darwin_arch", "i386" },                                    \
  53   { "darwin_crt2", "" },                                        \
  54   { "darwin_subarch", "i386" },
  55
  56 /* Use the following macro for any Darwin/x86-specific command-line option
  57    translation.  */
  58 #define SUBTARGET_OPTION_TRANSLATE_TABLE \
  59   { "", "" }
  60
  61 /* The Darwin assembler mostly follows AT&T syntax.  */
  62 #undef ASSEMBLER_DIALECT
  63 #define ASSEMBLER_DIALECT ASM_ATT
  64
  65 /* Define macro used to output shift-double opcodes when the shift
  66    count is in %cl.  Some assemblers require %cl as an argument;
  67    some don't.  This macro controls what to do: by default, don't
  68    print %cl.  */
  69
  70 #define SHIFT_DOUBLE_OMITS_COUNT 0
  71
  72 /* Define the syntax of pseudo-ops, labels and comments.  */
  73
  74 /* String containing the assembler's comment-starter.  */
  75
  76 #define ASM_COMMENT_START "#"
  77
  78 /* By default, target has a 80387, uses IEEE compatible arithmetic,
  79    and returns float values in the 387.  */
  80
  81 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE | MASK_ALIGN_DOUBLE)
  82
  83 /* TARGET_DEEP_BRANCH_PREDICTION is incompatible with Mach-O PIC.  */
  84
  85 #undef TARGET_DEEP_BRANCH_PREDICTION
  86 #define TARGET_DEEP_BRANCH_PREDICTION   0
  87
  88 /* For now, disable dynamic-no-pic.  We'll need to go through i386.c
  89    with a fine-tooth comb looking for refs to flag_pic!  */
  90 #define MASK_MACHO_DYNAMIC_NO_PIC 0
  91 #define TARGET_DYNAMIC_NO_PIC     (target_flags & MASK_MACHO_DYNAMIC_NO_PIC)
  92
  93 /* Define the syntax of pseudo-ops, labels and comments.  */
  94
  95 #define LPREFIX "L"
  96
  97 /* These are used by -fbranch-probabilities */
  98 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
  99 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
 100                               "__TEXT,__unlikely,regular,pure_instructions"
 101
 102 /* Assembler pseudos to introduce constants of various size.  */
 103
 104 #define ASM_BYTE_OP "\t.byte\t"
 105 #define ASM_SHORT "\t.word\t"
 106 #define ASM_LONG "\t.long\t"
 107 /* Darwin as doesn't do ".quad".  */
 108
 109 #undef ASM_OUTPUT_ALIGN
 110 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 111  do { if ((LOG) != 0)                   \
 112         {                               \
 113           if (in_section == text_section) \
 114             fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
 115           else                          \
 116             fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
 117         }                               \
 118     } while (0)
 119
 120 /* This says how to output an assembler line
 121    to define a global common symbol.  */
 122
 123 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
 124 ( fputs (".comm ", (FILE)),                     \
 125   assemble_name ((FILE), (NAME)),               \
 126   fprintf ((FILE), ",%lu\n", (unsigned long)(ROUNDED)))
 127
 128 /* This says how to output an assembler line
 129    to define a local common symbol.  */
 130
 131 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
 132 ( fputs (".lcomm ", (FILE)),                    \
 133   assemble_name ((FILE), (NAME)),               \
 134   fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (ROUNDED)))
 135
 136 /* Darwin profiling -- call mcount.  */
 137 #undef FUNCTION_PROFILER
 138 #define FUNCTION_PROFILER(FILE, LABELNO)                                \
 139     do {                                                                \
 140       if (MACHOPIC_INDIRECT)                                            \
 141         {                                                               \
 142           const char *name = machopic_mcount_stub_name ();              \
 143           fprintf (FILE, "\tcall %s\n", name+1);  /*  skip '&'  */      \
 144           machopic_validate_stub_or_non_lazy_ptr (name);                \
 145         }                                                               \
 146       else fprintf (FILE, "\tcall mcount\n");                           \
 147     } while (0)