gcc/config/i386/darwin.h

   1 /* Target definitions for x86 running Darwin.
   2    Copyright (C) 2001-2014 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 #undef  TARGET_64BIT_P
  30 #define TARGET_64BIT TARGET_ISA_64BIT
  31 #define TARGET_64BIT_P(x) TARGET_ISA_64BIT_P(x)
  32
  33 #ifdef IN_LIBGCC2
  34 #undef TARGET_64BIT
  35 #ifdef __x86_64__
  36 #define TARGET_64BIT 1
  37 #else
  38 #define TARGET_64BIT 0
  39 #endif
  40 #endif
  41
  42 /* Size of the Obj-C jump buffer.  */
  43 #define OBJC_JBLEN ((TARGET_64BIT) ? ((9 * 2) + 3 + 16) : (18))
  44
  45 #undef TARGET_FPMATH_DEFAULT
  46 #define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387)
  47
  48 #define TARGET_OS_CPP_BUILTINS()                \
  49   do                                            \
  50     {                                           \
  51       builtin_define ("__LITTLE_ENDIAN__");     \
  52       darwin_cpp_builtins (pfile);              \
  53     }                                           \
  54   while (0)
  55
  56 #undef PTRDIFF_TYPE
  57 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
  58
  59 #undef WCHAR_TYPE
  60 #define WCHAR_TYPE "int"
  61
  62 #undef WCHAR_TYPE_SIZE
  63 #define WCHAR_TYPE_SIZE 32
  64
  65 /* Generate branch islands stubs if this is true.  */
  66 extern int darwin_emit_branch_islands;
  67
  68 #undef TARGET_MACHO_BRANCH_ISLANDS
  69 #define TARGET_MACHO_BRANCH_ISLANDS darwin_emit_branch_islands
  70
  71 /* For compatibility with OSX system tools, use the new style of pic stub
  72    if this is set.  */
  73 #undef  MACHOPIC_ATT_STUB
  74 #define MACHOPIC_ATT_STUB (darwin_macho_att_stub)
  75
  76 #undef MAX_BITS_PER_WORD
  77 #define MAX_BITS_PER_WORD 64
  78
  79 #undef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
  80 #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN (0)
  81
  82 #undef TARGET_KEEPS_VECTOR_ALIGNED_STACK
  83 #define TARGET_KEEPS_VECTOR_ALIGNED_STACK 1
  84
  85 /* On Darwin, the stack is 128-bit aligned at the point of every call.
  86    Failure to ensure this will lead to a crash in the system libraries
  87    or dynamic loader.  */
  88 #undef STACK_BOUNDARY
  89 #define STACK_BOUNDARY \
  90  ((profile_flag || (TARGET_64BIT && ix86_abi == MS_ABI)) \
  91   ? 128 : BITS_PER_WORD)
  92
  93 #undef MAIN_STACK_BOUNDARY
  94 #define MAIN_STACK_BOUNDARY 128
  95
  96 /* Since we'll never want a stack boundary less aligned than 128 bits
  97    we need the extra work here otherwise bits of gcc get very grumpy
  98    when we ask for lower alignment.  We could just reject values less
  99    than 128 bits for Darwin, but it's easier to up the alignment if
 100    it's below the minimum.  */
 101 #undef PREFERRED_STACK_BOUNDARY
 102 #define PREFERRED_STACK_BOUNDARY                        \
 103   MAX (128, ix86_preferred_stack_boundary)
 104
 105 /* We want -fPIC by default, unless we're using -static to compile for
 106    the kernel or some such.  */
 107
 108 #undef CC1_SPEC
 109 #define CC1_SPEC "%(cc1_cpu) \
 110   %{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
 111   %{!mmacosx-version-min=*:-mmacosx-version-min=%(darwin_minversion)} \
 112   %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} " \
 113   DARWIN_CC1_SPEC
 114
 115 #undef ASM_SPEC
 116 #define ASM_SPEC "-arch %(darwin_arch) -force_cpusubtype_ALL \
 117   %{static}"
 118
 119 #define DARWIN_ARCH_SPEC "%{m64:x86_64;:i386}"
 120 #define DARWIN_SUBARCH_SPEC DARWIN_ARCH_SPEC
 121
 122 /* Determine a minimum version based on compiler options.  */
 123 #define DARWIN_MINVERSION_SPEC                          \
 124  "%{!m64|fgnu-runtime:10.4;                             \
 125     ,objective-c|,objc-cpp-output:10.5;                 \
 126     ,objective-c-header:10.5;                           \
 127     ,objective-c++|,objective-c++-cpp-output:10.5;      \
 128     ,objective-c++-header|,objc++-cpp-output:10.5;      \
 129     :10.4}"
 130
 131 #undef ENDFILE_SPEC
 132 #define ENDFILE_SPEC \
 133   "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
 134    %{mpc32:crtprec32.o%s} \
 135    %{mpc64:crtprec64.o%s} \
 136    %{mpc80:crtprec80.o%s}" TM_DESTRUCTOR
 137
 138 #undef SUBTARGET_EXTRA_SPECS
 139 #define SUBTARGET_EXTRA_SPECS                                   \
 140   DARWIN_EXTRA_SPECS                                            \
 141   { "darwin_arch", DARWIN_ARCH_SPEC },                          \
 142   { "darwin_crt2", "" },                                        \
 143   { "darwin_subarch", DARWIN_SUBARCH_SPEC },
 144
 145 /* The Darwin assembler mostly follows AT&T syntax.  */
 146 #undef ASSEMBLER_DIALECT
 147 #define ASSEMBLER_DIALECT ASM_ATT
 148
 149 /* Define macro used to output shift-double opcodes when the shift
 150    count is in %cl.  Some assemblers require %cl as an argument;
 151    some don't.  This macro controls what to do: by default, don't
 152    print %cl.  */
 153
 154 #define SHIFT_DOUBLE_OMITS_COUNT 0
 155
 156 /* Put all *tf routines in libgcc.  */
 157 #define LIBGCC2_TF_CEXT q
 158
 159 #undef TARGET_ASM_FILE_END
 160 #define TARGET_ASM_FILE_END darwin_file_end
 161
 162 /* Define the syntax of pseudo-ops, labels and comments.  */
 163
 164 /* String containing the assembler's comment-starter.  */
 165
 166 #define ASM_COMMENT_START "#"
 167
 168 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 169    and returns float values in the 387.  */
 170
 171 #undef TARGET_SUBTARGET_DEFAULT
 172 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE)
 173
 174 /* For darwin we want to target specific processor features as a minimum,
 175    but these unfortunately don't correspond to a specific processor.  */
 176 #undef TARGET_SUBTARGET32_ISA_DEFAULT
 177 #define TARGET_SUBTARGET32_ISA_DEFAULT (OPTION_MASK_ISA_MMX             \
 178                                         | OPTION_MASK_ISA_SSE           \
 179                                         | OPTION_MASK_ISA_SSE2          \
 180                                         | OPTION_MASK_ISA_SSE3)
 181
 182 #undef TARGET_SUBTARGET64_ISA_DEFAULT
 183 #define TARGET_SUBTARGET64_ISA_DEFAULT TARGET_SUBTARGET32_ISA_DEFAULT
 184
 185 #undef GOT_SYMBOL_NAME
 186 #define GOT_SYMBOL_NAME MACHOPIC_FUNCTION_BASE_NAME
 187
 188 /* Define the syntax of pseudo-ops, labels and comments.  */
 189
 190 #define LPREFIX "L"
 191
 192 /* Assembler pseudos to introduce constants of various size.  */
 193
 194 #define ASM_BYTE "\t.byte\t"
 195 #define ASM_SHORT "\t.word\t"
 196 #define ASM_LONG "\t.long\t"
 197 #define ASM_QUAD "\t.quad\t"
 198
 199 #define SUBTARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
 200
 201 #undef ASM_OUTPUT_ALIGN
 202 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 203  do { if ((LOG) != 0)                   \
 204         {                               \
 205           if (in_section == text_section) \
 206             fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
 207           else                          \
 208             fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
 209         }                               \
 210     } while (0)
 211
 212 /* Darwin profiling -- call mcount.  */
 213 #undef FUNCTION_PROFILER
 214 #define FUNCTION_PROFILER(FILE, LABELNO)                                \
 215     do {                                                                \
 216       if (TARGET_MACHO_BRANCH_ISLANDS                                   \
 217            && MACHOPIC_INDIRECT && !TARGET_64BIT)                       \
 218         {                                                               \
 219           const char *name = machopic_mcount_stub_name ();              \
 220           fprintf (FILE, "\tcall %s\n", name+1);  /*  skip '&'  */      \
 221           machopic_validate_stub_or_non_lazy_ptr (name);                \
 222         }                                                               \
 223       else fprintf (FILE, "\tcall mcount\n");                           \
 224     } while (0)
 225
 226 #define C_COMMON_OVERRIDE_OPTIONS                                       \
 227   do {                                                                  \
 228     SUBTARGET_C_COMMON_OVERRIDE_OPTIONS;                                \
 229   } while (0)
 230
 231 #undef SUBTARGET_OVERRIDE_OPTIONS
 232 #define SUBTARGET_OVERRIDE_OPTIONS \
 233 do {                                                                    \
 234   if (TARGET_64BIT && MACHO_DYNAMIC_NO_PIC_P)                           \
 235     target_flags &= ~MASK_MACHO_DYNAMIC_NO_PIC;                         \
 236 } while (0)
 237
 238 /* Darwin on x86_64 uses dwarf-2 by default.  Pre-darwin9 32-bit
 239    compiles default to stabs+.  darwin9+ defaults to dwarf-2.  */
 240 #ifndef DARWIN_PREFER_DWARF
 241 #undef PREFERRED_DEBUGGING_TYPE
 242 #define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG)
 243 #endif
 244
 245 /* Darwin uses the standard DWARF register numbers but the default
 246    register numbers for STABS.  Fortunately for 64-bit code the
 247    default and the standard are the same.  */
 248 #undef DBX_REGISTER_NUMBER
 249 #define DBX_REGISTER_NUMBER(n)                                  \
 250   (TARGET_64BIT ? dbx64_register_map[n]                         \
 251    : write_symbols == DWARF2_DEBUG ? svr4_dbx_register_map[n]   \
 252    : dbx_register_map[n])
 253
 254 /* Unfortunately, the 32-bit EH information also doesn't use the standard
 255    DWARF register numbers.  */
 256 #define DWARF2_FRAME_REG_OUT(n, for_eh)                                 \
 257   (! (for_eh) || write_symbols != DWARF2_DEBUG || TARGET_64BIT ? (n)    \
 258    : (n) == 5 ? 4                                                       \
 259    : (n) == 4 ? 5                                                       \
 260    : (n) >= 11 && (n) <= 18 ? (n) + 1                                   \
 261    : (n))
 262
 263 #undef REGISTER_SUBTARGET_PRAGMAS
 264 #define REGISTER_SUBTARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS()
 265
 266 #undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES
 267 #define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes
 268
 269 /* For 64-bit, we need to add 4 because @GOTPCREL is relative to the
 270    end of the instruction, but without the 4 we'd only have the right
 271    address for the start of the instruction.  */
 272 #undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
 273 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE)     \
 274   if (TARGET_64BIT)                                                             \
 275     {                                                                           \
 276       if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel)                 \
 277         {                                                                       \
 278            fputs (ASM_LONG, FILE);                                              \
 279            assemble_name (FILE, XSTR (ADDR, 0));                                \
 280            fputs ("+4@GOTPCREL", FILE);                                         \
 281            goto DONE;                                                           \
 282         }                                                                       \
 283     }                                                                           \
 284   else                                                                          \
 285     {                                                                           \
 286       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1))                      \
 287         {                                                                       \
 288           darwin_non_lazy_pcrel (FILE, ADDR);                                   \
 289           goto DONE;                                                            \
 290         }                                                                       \
 291     }
 292
 293 /* This needs to move since i386 uses the first flag and other flags are
 294    used in Mach-O.  */
 295 #undef MACHO_SYMBOL_FLAG_VARIABLE
 296 #define MACHO_SYMBOL_FLAG_VARIABLE ((SYMBOL_FLAG_MACH_DEP) << 3)
 297
 298 #undef MACHOPIC_NL_SYMBOL_PTR_SECTION
 299 #define MACHOPIC_NL_SYMBOL_PTR_SECTION \
 300                 ".section __IMPORT,__pointers,non_lazy_symbol_pointers"
 301
 302 #define SUBTARGET32_DEFAULT_CPU "i686"
 303
 304 #undef  SUBTARGET_INIT_BUILTINS
 305 #define SUBTARGET_INIT_BUILTINS                                 \
 306 do {                                                            \
 307   ix86_builtins[(int) IX86_BUILTIN_CFSTRING]                    \
 308     = darwin_init_cfstring_builtins ((unsigned) (IX86_BUILTIN_CFSTRING));       \
 309   darwin_rename_builtins ();                                    \
 310 } while(0)