gcc/config/i386/darwin.h

   1 /* Target definitions for x86 running Darwin.
   2    Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007
   3    Free Software Foundation, Inc.
   4    Contributed by Apple Computer Inc.
   5
   6 This file is part of GCC.
   7
   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 3, or (at your option)
  11 any later version.
  12
  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.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  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_64BIT
  29 #define TARGET_64BIT OPTION_ISA_64BIT
  30
  31 #ifdef IN_LIBGCC2
  32 #undef TARGET_64BIT
  33 #ifdef __x86_64__
  34 #define TARGET_64BIT 1
  35 #else
  36 #define TARGET_64BIT 0
  37 #endif
  38 #endif
  39
  40 /* Size of the Obj-C jump buffer.  */
  41 #define OBJC_JBLEN ((TARGET_64BIT) ? ((9 * 2) + 3 + 16) : (18))
  42
  43 #undef TARGET_FPMATH_DEFAULT
  44 #define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387)
  45
  46 #define TARGET_OS_CPP_BUILTINS()                \
  47   do                                            \
  48     {                                           \
  49       builtin_define ("__LITTLE_ENDIAN__");     \
  50       darwin_cpp_builtins (pfile);              \
  51     }                                           \
  52   while (0)
  53
  54 #undef PTRDIFF_TYPE
  55 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
  56
  57 #undef WCHAR_TYPE
  58 #define WCHAR_TYPE "int"
  59
  60 #undef WCHAR_TYPE_SIZE
  61 #define WCHAR_TYPE_SIZE 32
  62
  63 #undef MAX_BITS_PER_WORD
  64 #define MAX_BITS_PER_WORD 64
  65
  66 #undef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
  67 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN (0)
  68
  69 #undef TARGET_KEEPS_VECTOR_ALIGNED_STACK
  70 #define TARGET_KEEPS_VECTOR_ALIGNED_STACK 1
  71
  72 /* On Darwin, the stack is 128-bit aligned at the point of every call.
  73    Failure to ensure this will lead to a crash in the system libraries
  74    or dynamic loader.  */
  75 #undef STACK_BOUNDARY
  76 #define STACK_BOUNDARY 128
  77
  78 /* Since we'll never want a stack boundary less aligned than 128 bits
  79    we need the extra work here otherwise bits of gcc get very grumpy
  80    when we ask for lower alignment.  We could just reject values less
  81    than 128 bits for Darwin, but it's easier to up the alignment if
  82    it's below the minimum.  */
  83 #undef PREFERRED_STACK_BOUNDARY
  84 #define PREFERRED_STACK_BOUNDARY                        \
  85   MAX (STACK_BOUNDARY, ix86_preferred_stack_boundary)
  86
  87 /* We want -fPIC by default, unless we're using -static to compile for
  88    the kernel or some such.  */
  89
  90 #undef CC1_SPEC
  91 #define CC1_SPEC "%(cc1_cpu) \
  92   %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
  93   %{!mmacosx-version-min=*:-mmacosx-version-min=%(darwin_minversion)} \
  94   %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }}"
  95
  96 #undef ASM_SPEC
  97 #define ASM_SPEC "-arch %(darwin_arch) -force_cpusubtype_ALL"
  98
  99 #define DARWIN_ARCH_SPEC "%{m64:x86_64;:i386}"
 100 #define DARWIN_SUBARCH_SPEC DARWIN_ARCH_SPEC
 101
 102 /* Determine a minimum version based on compiler options.  */
 103 #define DARWIN_MINVERSION_SPEC                          \
 104  "%{!m64|fgnu-runtime:10.4;                             \
 105     ,objective-c|,objc-cpp-output:10.5;                 \
 106     ,objective-c-header:10.5;                           \
 107     ,objective-c++|,objective-c++-cpp-output:10.5;      \
 108     ,objective-c++-header|,objc++-cpp-output:10.5;      \
 109     :10.4}"
 110
 111 #undef ENDFILE_SPEC
 112 #define ENDFILE_SPEC \
 113   "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
 114    %{mpc32:crtprec32.o%s} \
 115    %{mpc64:crtprec64.o%s} \
 116    %{mpc80:crtprec80.o%s}"
 117
 118 #undef SUBTARGET_EXTRA_SPECS
 119 #define SUBTARGET_EXTRA_SPECS                                   \
 120   DARWIN_EXTRA_SPECS                                            \
 121   { "darwin_arch", DARWIN_ARCH_SPEC },                          \
 122   { "darwin_crt2", "" },                                        \
 123   { "darwin_subarch", DARWIN_SUBARCH_SPEC },
 124
 125 /* Use the following macro for any Darwin/x86-specific command-line option
 126    translation.  */
 127 #define SUBTARGET_OPTION_TRANSLATE_TABLE \
 128   { "", "" }
 129
 130 /* The Darwin assembler mostly follows AT&T syntax.  */
 131 #undef ASSEMBLER_DIALECT
 132 #define ASSEMBLER_DIALECT ASM_ATT
 133
 134 /* Define macro used to output shift-double opcodes when the shift
 135    count is in %cl.  Some assemblers require %cl as an argument;
 136    some don't.  This macro controls what to do: by default, don't
 137    print %cl.  */
 138
 139 #define SHIFT_DOUBLE_OMITS_COUNT 0
 140
 141 extern void darwin_x86_file_end (void);
 142 #undef TARGET_ASM_FILE_END
 143 #define TARGET_ASM_FILE_END darwin_x86_file_end
 144
 145 /* Define the syntax of pseudo-ops, labels and comments.  */
 146
 147 /* String containing the assembler's comment-starter.  */
 148
 149 #define ASM_COMMENT_START "#"
 150
 151 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 152    and returns float values in the 387.  */
 153
 154 #undef TARGET_SUBTARGET_DEFAULT
 155 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE)
 156
 157 /* For darwin we want to target specific processor features as a minimum,
 158    but these unfortunately don't correspond to a specific processor.  */
 159 #undef TARGET_SUBTARGET32_ISA_DEFAULT
 160 #define TARGET_SUBTARGET32_ISA_DEFAULT (OPTION_MASK_ISA_MMX             \
 161                                         | OPTION_MASK_ISA_SSE           \
 162                                         | OPTION_MASK_ISA_SSE2)
 163
 164 #undef TARGET_SUBTARGET64_ISA_DEFAULT
 165 #define TARGET_SUBTARGET64_ISA_DEFAULT (OPTION_MASK_ISA_MMX             \
 166                                         | OPTION_MASK_ISA_SSE           \
 167                                         | OPTION_MASK_ISA_SSE2          \
 168                                         | OPTION_MASK_ISA_SSE3)
 169
 170 /* For now, disable dynamic-no-pic.  We'll need to go through i386.c
 171    with a fine-tooth comb looking for refs to flag_pic!  */
 172 #define MASK_MACHO_DYNAMIC_NO_PIC 0
 173 #define TARGET_DYNAMIC_NO_PIC     (target_flags & MASK_MACHO_DYNAMIC_NO_PIC)
 174
 175 #undef GOT_SYMBOL_NAME
 176 #define GOT_SYMBOL_NAME (machopic_function_base_name ())
 177
 178 /* Define the syntax of pseudo-ops, labels and comments.  */
 179
 180 #define LPREFIX "L"
 181
 182 /* These are used by -fbranch-probabilities */
 183 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
 184 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
 185                               "__TEXT,__unlikely,regular,pure_instructions"
 186
 187 /* Assembler pseudos to introduce constants of various size.  */
 188
 189 #define ASM_BYTE_OP "\t.byte\t"
 190 #define ASM_SHORT "\t.word\t"
 191 #define ASM_LONG "\t.long\t"
 192 #define ASM_QUAD "\t.quad\t"
 193
 194 #define SUBTARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
 195
 196 #undef ASM_OUTPUT_ALIGN
 197 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 198  do { if ((LOG) != 0)                   \
 199         {                               \
 200           if (in_section == text_section) \
 201             fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
 202           else                          \
 203             fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
 204         }                               \
 205     } while (0)
 206
 207 /* This says how to output an assembler line
 208    to define a global common symbol.  */
 209
 210 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
 211 ( fputs (".comm ", (FILE)),                     \
 212   assemble_name ((FILE), (NAME)),               \
 213   fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (ROUNDED)))
 214
 215 /* This says how to output an assembler line
 216    to define a local common symbol.  */
 217
 218 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
 219 ( fputs (".lcomm ", (FILE)),                    \
 220   assemble_name ((FILE), (NAME)),               \
 221   fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (ROUNDED)))
 222
 223 /* Darwin profiling -- call mcount.  */
 224 #undef FUNCTION_PROFILER
 225 #define FUNCTION_PROFILER(FILE, LABELNO)                                \
 226     do {                                                                \
 227       if (MACHOPIC_INDIRECT && !TARGET_64BIT)                           \
 228         {                                                               \
 229           const char *name = machopic_mcount_stub_name ();              \
 230           fprintf (FILE, "\tcall %s\n", name+1);  /*  skip '&'  */      \
 231           machopic_validate_stub_or_non_lazy_ptr (name);                \
 232         }                                                               \
 233       else fprintf (FILE, "\tcall mcount\n");                           \
 234     } while (0)
 235
 236 #define C_COMMON_OVERRIDE_OPTIONS                                       \
 237   do {                                                                  \
 238     SUBTARGET_C_COMMON_OVERRIDE_OPTIONS;                                \
 239   } while (0)
 240
 241 /* Darwin on x86_64 uses dwarf-2 by default.  Pre-darwin9 32-bit
 242    compiles default to stabs+.  darwin9+ defaults to dwarf-2.  */
 243 #ifndef DARWIN_PREFER_DWARF
 244 #undef PREFERRED_DEBUGGING_TYPE
 245 #define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG)
 246 #endif
 247
 248 /* Darwin uses the standard DWARF register numbers but the default
 249    register numbers for STABS.  Fortunately for 64-bit code the
 250    default and the standard are the same.  */
 251 #undef DBX_REGISTER_NUMBER
 252 #define DBX_REGISTER_NUMBER(n)                                  \
 253   (TARGET_64BIT ? dbx64_register_map[n]                         \
 254    : write_symbols == DWARF2_DEBUG ? svr4_dbx_register_map[n]   \
 255    : dbx_register_map[n])
 256
 257 /* Unfortunately, the 32-bit EH information also doesn't use the standard
 258    DWARF register numbers.  */
 259 #define DWARF2_FRAME_REG_OUT(n, for_eh)                                 \
 260   (! (for_eh) || write_symbols != DWARF2_DEBUG || TARGET_64BIT ? (n)    \
 261    : (n) == 5 ? 4                                                       \
 262    : (n) == 4 ? 5                                                       \
 263    : (n) >= 11 && (n) <= 18 ? (n) + 1                                   \
 264    : (n))
 265
 266 #undef REGISTER_TARGET_PRAGMAS
 267 #define REGISTER_TARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS()
 268
 269 #undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES
 270 #define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes
 271
 272 /* For 64-bit, we need to add 4 because @GOTPCREL is relative to the
 273    end of the instruction, but without the 4 we'd only have the right
 274    address for the start of the instruction.  */
 275 #undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
 276 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE)     \
 277   if (TARGET_64BIT)                                                             \
 278     {                                                                           \
 279       if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel)                 \
 280         {                                                                       \
 281            fputs (ASM_LONG, FILE);                                              \
 282            assemble_name (FILE, XSTR (ADDR, 0));                                \
 283            fputs ("+4@GOTPCREL", FILE);                                         \
 284            goto DONE;                                                           \
 285         }                                                                       \
 286     }                                                                           \
 287   else                                                                          \
 288     {                                                                           \
 289       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1))                      \
 290         {                                                                       \
 291           darwin_non_lazy_pcrel (FILE, ADDR);                                   \
 292           goto DONE;                                                            \
 293         }                                                                       \
 294     }
 295
 296 /* This needs to move since i386 uses the first flag and other flags are
 297    used in Mach-O.  */
 298 #undef MACHO_SYMBOL_FLAG_VARIABLE
 299 #define MACHO_SYMBOL_FLAG_VARIABLE ((SYMBOL_FLAG_MACH_DEP) << 3)