gcc/config/i386/darwin.h

   1 /* Target definitions for x86 running Darwin.
   2    Copyright (C) 2001-2013 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 3, 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 COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 /* Enable Mach-O bits in generic x86 code.  */
  22 #undef TARGET_MACHO
  23 #define TARGET_MACHO 1
  24
  25 #undef DARWIN_X86
  26 #define DARWIN_X86 1
  27
  28 #undef  TARGET_64BIT
  29 #define TARGET_64BIT TARGET_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 /* Generate branch islands stubs if this is true.  */
  64 extern int darwin_emit_branch_islands;
  65
  66 #undef TARGET_MACHO_BRANCH_ISLANDS
  67 #define TARGET_MACHO_BRANCH_ISLANDS darwin_emit_branch_islands
  68
  69 /* For compatibility with OSX system tools, use the new style of pic stub
  70    if this is set.  */
  71 #undef  MACHOPIC_ATT_STUB
  72 #define MACHOPIC_ATT_STUB (darwin_macho_att_stub)
  73
  74 #undef MAX_BITS_PER_WORD
  75 #define MAX_BITS_PER_WORD 64
  76
  77 #undef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
  78 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN (0)
  79
  80 #undef TARGET_KEEPS_VECTOR_ALIGNED_STACK
  81 #define TARGET_KEEPS_VECTOR_ALIGNED_STACK 1
  82
  83 /* On Darwin, the stack is 128-bit aligned at the point of every call.
  84    Failure to ensure this will lead to a crash in the system libraries
  85    or dynamic loader.  */
  86 #undef STACK_BOUNDARY
  87 #define STACK_BOUNDARY \
  88  ((profile_flag || (TARGET_64BIT && ix86_abi == MS_ABI)) \
  89   ? 128 : BITS_PER_WORD)
  90
  91 #undef MAIN_STACK_BOUNDARY
  92 #define MAIN_STACK_BOUNDARY 128
  93
  94 /* Since we'll never want a stack boundary less aligned than 128 bits
  95    we need the extra work here otherwise bits of gcc get very grumpy
  96    when we ask for lower alignment.  We could just reject values less
  97    than 128 bits for Darwin, but it's easier to up the alignment if
  98    it's below the minimum.  */
  99 #undef PREFERRED_STACK_BOUNDARY
 100 #define PREFERRED_STACK_BOUNDARY                        \
 101   MAX (128, ix86_preferred_stack_boundary)
 102
 103 /* We want -fPIC by default, unless we're using -static to compile for
 104    the kernel or some such.  */
 105
 106 #undef CC1_SPEC
 107 #define CC1_SPEC "%(cc1_cpu) \
 108   %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
 109   %{!mmacosx-version-min=*:-mmacosx-version-min=%(darwin_minversion)} \
 110   %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} " \
 111   DARWIN_CC1_SPEC
 112
 113 #undef ASM_SPEC
 114 #define ASM_SPEC "-arch %(darwin_arch) -force_cpusubtype_ALL \
 115   %{static}"
 116
 117 #define DARWIN_ARCH_SPEC "%{m64:x86_64;:i386}"
 118 #define DARWIN_SUBARCH_SPEC DARWIN_ARCH_SPEC
 119
 120 /* Determine a minimum version based on compiler options.  */
 121 #define DARWIN_MINVERSION_SPEC                          \
 122  "%{!m64|fgnu-runtime:10.4;                             \
 123     ,objective-c|,objc-cpp-output:10.5;                 \
 124     ,objective-c-header:10.5;                           \
 125     ,objective-c++|,objective-c++-cpp-output:10.5;      \
 126     ,objective-c++-header|,objc++-cpp-output:10.5;      \
 127     :10.4}"
 128
 129 #undef ENDFILE_SPEC
 130 #define ENDFILE_SPEC \
 131   "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
 132    %{mpc32:crtprec32.o%s} \
 133    %{mpc64:crtprec64.o%s} \
 134    %{mpc80:crtprec80.o%s}" TM_DESTRUCTOR
 135
 136 #undef SUBTARGET_EXTRA_SPECS
 137 #define SUBTARGET_EXTRA_SPECS                                   \
 138   DARWIN_EXTRA_SPECS                                            \
 139   { "darwin_arch", DARWIN_ARCH_SPEC },                          \
 140   { "darwin_crt2", "" },                                        \
 141   { "darwin_subarch", DARWIN_SUBARCH_SPEC },
 142
 143 /* The Darwin assembler mostly follows AT&T syntax.  */
 144 #undef ASSEMBLER_DIALECT
 145 #define ASSEMBLER_DIALECT ASM_ATT
 146
 147 /* Define macro used to output shift-double opcodes when the shift
 148    count is in %cl.  Some assemblers require %cl as an argument;
 149    some don't.  This macro controls what to do: by default, don't
 150    print %cl.  */
 151
 152 #define SHIFT_DOUBLE_OMITS_COUNT 0
 153
 154 /* Put all *tf routines in libgcc.  */
 155 #undef LIBGCC2_HAS_TF_MODE
 156 #define LIBGCC2_HAS_TF_MODE 1
 157 #define LIBGCC2_TF_CEXT q
 158 #define TF_SIZE 113
 159
 160 #undef TARGET_ASM_FILE_END
 161 #define TARGET_ASM_FILE_END darwin_file_end
 162
 163 /* Define the syntax of pseudo-ops, labels and comments.  */
 164
 165 /* String containing the assembler's comment-starter.  */
 166
 167 #define ASM_COMMENT_START "#"
 168
 169 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 170    and returns float values in the 387.  */
 171
 172 #undef TARGET_SUBTARGET_DEFAULT
 173 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE)
 174
 175 /* For darwin we want to target specific processor features as a minimum,
 176    but these unfortunately don't correspond to a specific processor.  */
 177 #undef TARGET_SUBTARGET32_ISA_DEFAULT
 178 #define TARGET_SUBTARGET32_ISA_DEFAULT (OPTION_MASK_ISA_MMX             \
 179                                         | OPTION_MASK_ISA_SSE           \
 180                                         | OPTION_MASK_ISA_SSE2          \
 181                                         | OPTION_MASK_ISA_SSE3)
 182
 183 #undef TARGET_SUBTARGET64_ISA_DEFAULT
 184 #define TARGET_SUBTARGET64_ISA_DEFAULT TARGET_SUBTARGET32_ISA_DEFAULT
 185
 186 #undef GOT_SYMBOL_NAME
 187 #define GOT_SYMBOL_NAME MACHOPIC_FUNCTION_BASE_NAME
 188
 189 /* Define the syntax of pseudo-ops, labels and comments.  */
 190
 191 #define LPREFIX "L"
 192
 193 /* Assembler pseudos to introduce constants of various size.  */
 194
 195 #define ASM_BYTE "\t.byte\t"
 196 #define ASM_SHORT "\t.word\t"
 197 #define ASM_LONG "\t.long\t"
 198 #define ASM_QUAD "\t.quad\t"
 199
 200 #define SUBTARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
 201
 202 #undef ASM_OUTPUT_ALIGN
 203 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 204  do { if ((LOG) != 0)                   \
 205         {                               \
 206           if (in_section == text_section) \
 207             fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
 208           else                          \
 209             fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
 210         }                               \
 211     } while (0)
 212
 213 /* Darwin profiling -- call mcount.  */
 214 #undef FUNCTION_PROFILER
 215 #define FUNCTION_PROFILER(FILE, LABELNO)                                \
 216     do {                                                                \
 217       if (TARGET_MACHO_BRANCH_ISLANDS                                   \
 218            && MACHOPIC_INDIRECT && !TARGET_64BIT)                       \
 219         {                                                               \
 220           const char *name = machopic_mcount_stub_name ();              \
 221           fprintf (FILE, "\tcall %s\n", name+1);  /*  skip '&'  */      \
 222           machopic_validate_stub_or_non_lazy_ptr (name);                \
 223         }                                                               \
 224       else fprintf (FILE, "\tcall mcount\n");                           \
 225     } while (0)
 226
 227 #define C_COMMON_OVERRIDE_OPTIONS                                       \
 228   do {                                                                  \
 229     SUBTARGET_C_COMMON_OVERRIDE_OPTIONS;                                \
 230   } while (0)
 231
 232 #undef SUBTARGET_OVERRIDE_OPTIONS
 233 #define SUBTARGET_OVERRIDE_OPTIONS \
 234 do {                                                                    \
 235   if (TARGET_64BIT && MACHO_DYNAMIC_NO_PIC_P)                           \
 236     target_flags &= ~MASK_MACHO_DYNAMIC_NO_PIC;                         \
 237 } while (0)
 238
 239 /* Darwin on x86_64 uses dwarf-2 by default.  Pre-darwin9 32-bit
 240    compiles default to stabs+.  darwin9+ defaults to dwarf-2.  */
 241 #ifndef DARWIN_PREFER_DWARF
 242 #undef PREFERRED_DEBUGGING_TYPE
 243 #define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG)
 244 #endif
 245
 246 /* Darwin uses the standard DWARF register numbers but the default
 247    register numbers for STABS.  Fortunately for 64-bit code the
 248    default and the standard are the same.  */
 249 #undef DBX_REGISTER_NUMBER
 250 #define DBX_REGISTER_NUMBER(n)                                  \
 251   (TARGET_64BIT ? dbx64_register_map[n]                         \
 252    : write_symbols == DWARF2_DEBUG ? svr4_dbx_register_map[n]   \
 253    : dbx_register_map[n])
 254
 255 /* Unfortunately, the 32-bit EH information also doesn't use the standard
 256    DWARF register numbers.  */
 257 #define DWARF2_FRAME_REG_OUT(n, for_eh)                                 \
 258   (! (for_eh) || write_symbols != DWARF2_DEBUG || TARGET_64BIT ? (n)    \
 259    : (n) == 5 ? 4                                                       \
 260    : (n) == 4 ? 5                                                       \
 261    : (n) >= 11 && (n) <= 18 ? (n) + 1                                   \
 262    : (n))
 263
 264 #undef REGISTER_SUBTARGET_PRAGMAS
 265 #define REGISTER_SUBTARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS()
 266
 267 #undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES
 268 #define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes
 269
 270 /* For 64-bit, we need to add 4 because @GOTPCREL is relative to the
 271    end of the instruction, but without the 4 we'd only have the right
 272    address for the start of the instruction.  */
 273 #undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
 274 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE)     \
 275   if (TARGET_64BIT)                                                             \
 276     {                                                                           \
 277       if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel)                 \
 278         {                                                                       \
 279            fputs (ASM_LONG, FILE);                                              \
 280            assemble_name (FILE, XSTR (ADDR, 0));                                \
 281            fputs ("+4@GOTPCREL", FILE);                                         \
 282            goto DONE;                                                           \
 283         }                                                                       \
 284     }                                                                           \
 285   else                                                                          \
 286     {                                                                           \
 287       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1))                      \
 288         {                                                                       \
 289           darwin_non_lazy_pcrel (FILE, ADDR);                                   \
 290           goto DONE;                                                            \
 291         }                                                                       \
 292     }
 293
 294 /* This needs to move since i386 uses the first flag and other flags are
 295    used in Mach-O.  */
 296 #undef MACHO_SYMBOL_FLAG_VARIABLE
 297 #define MACHO_SYMBOL_FLAG_VARIABLE ((SYMBOL_FLAG_MACH_DEP) << 3)
 298
 299 #undef MACHOPIC_NL_SYMBOL_PTR_SECTION
 300 #define MACHOPIC_NL_SYMBOL_PTR_SECTION \
 301                 ".section __IMPORT,__pointers,non_lazy_symbol_pointers"
 302
 303 #define SUBTARGET32_DEFAULT_CPU "i686"
 304
 305 #undef  SUBTARGET_INIT_BUILTINS
 306 #define SUBTARGET_INIT_BUILTINS                                 \
 307 do {                                                            \
 308   ix86_builtins[(int) IX86_BUILTIN_CFSTRING]                    \
 309     = darwin_init_cfstring_builtins ((unsigned) (IX86_BUILTIN_CFSTRING));       \
 310   darwin_rename_builtins ();                                    \
 311 } while(0)