gcc/config/i386/darwin.h

   1 /* Target definitions for x86 running Darwin.
   2    Copyright (C) 2001-2016 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   %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} " \
 112   DARWIN_CC1_SPEC
 113
 114 #undef ASM_SPEC
 115 #define ASM_SPEC "-arch %(darwin_arch) \
 116   " ASM_OPTIONS " -force_cpusubtype_ALL \
 117   %{static}" ASM_MMACOSX_VERSION_MIN_SPEC
 118
 119 #define DARWIN_ARCH_SPEC "%{m64:x86_64;:i386}"
 120 #define DARWIN_SUBARCH_SPEC DARWIN_ARCH_SPEC
 121
 122 #undef ENDFILE_SPEC
 123 #define ENDFILE_SPEC \
 124   "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
 125    %{mpc32:crtprec32.o%s} \
 126    %{mpc64:crtprec64.o%s} \
 127    %{mpc80:crtprec80.o%s}" TM_DESTRUCTOR
 128
 129 #undef SUBTARGET_EXTRA_SPECS
 130 #define SUBTARGET_EXTRA_SPECS                                   \
 131   DARWIN_EXTRA_SPECS                                            \
 132   { "darwin_arch", DARWIN_ARCH_SPEC },                          \
 133   { "darwin_crt2", "" },                                        \
 134   { "darwin_subarch", DARWIN_SUBARCH_SPEC },
 135
 136 /* The Darwin assembler mostly follows AT&T syntax.  */
 137 #undef ASSEMBLER_DIALECT
 138 #define ASSEMBLER_DIALECT ASM_ATT
 139
 140 /* Define macro used to output shift-double opcodes when the shift
 141    count is in %cl.  Some assemblers require %cl as an argument;
 142    some don't.  This macro controls what to do: by default, don't
 143    print %cl.  */
 144
 145 #define SHIFT_DOUBLE_OMITS_COUNT 0
 146
 147 #undef TARGET_ASM_FILE_END
 148 #define TARGET_ASM_FILE_END darwin_file_end
 149
 150 /* Define the syntax of pseudo-ops, labels and comments.  */
 151
 152 /* String containing the assembler's comment-starter.  */
 153
 154 #define ASM_COMMENT_START "#"
 155
 156 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 157    and returns float values in the 387.  */
 158
 159 #undef TARGET_SUBTARGET_DEFAULT
 160 #define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE)
 161
 162 /* For darwin we want to target specific processor features as a minimum,
 163    but these unfortunately don't correspond to a specific processor.  */
 164 #undef TARGET_SUBTARGET32_ISA_DEFAULT
 165 #define TARGET_SUBTARGET32_ISA_DEFAULT (OPTION_MASK_ISA_MMX             \
 166                                         | OPTION_MASK_ISA_SSE           \
 167                                         | OPTION_MASK_ISA_SSE2          \
 168                                         | OPTION_MASK_ISA_SSE3)
 169
 170 #undef TARGET_SUBTARGET64_ISA_DEFAULT
 171 #define TARGET_SUBTARGET64_ISA_DEFAULT TARGET_SUBTARGET32_ISA_DEFAULT
 172
 173 #undef GOT_SYMBOL_NAME
 174 #define GOT_SYMBOL_NAME MACHOPIC_FUNCTION_BASE_NAME
 175
 176 /* Define the syntax of pseudo-ops, labels and comments.  */
 177
 178 #define LPREFIX "L"
 179
 180 /* Assembler pseudos to introduce constants of various size.  */
 181
 182 #define ASM_BYTE "\t.byte\t"
 183 #define ASM_SHORT "\t.word\t"
 184 #define ASM_LONG "\t.long\t"
 185 #define ASM_QUAD "\t.quad\t"
 186
 187 #define SUBTARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
 188
 189 #undef ASM_OUTPUT_ALIGN
 190 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 191  do { if ((LOG) != 0)                   \
 192         {                               \
 193           if (in_section == text_section) \
 194             fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
 195           else                          \
 196             fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
 197         }                               \
 198     } while (0)
 199
 200 /* Darwin profiling -- call mcount.  */
 201 #undef FUNCTION_PROFILER
 202 #define FUNCTION_PROFILER(FILE, LABELNO)                                \
 203     do {                                                                \
 204       if (TARGET_MACHO_BRANCH_ISLANDS                                   \
 205            && MACHOPIC_INDIRECT && !TARGET_64BIT)                       \
 206         {                                                               \
 207           const char *name = machopic_mcount_stub_name ();              \
 208           fprintf (FILE, "\tcall %s\n", name+1);  /*  skip '&'  */      \
 209           machopic_validate_stub_or_non_lazy_ptr (name);                \
 210         }                                                               \
 211       else fprintf (FILE, "\tcall mcount\n");                           \
 212     } while (0)
 213
 214 #define C_COMMON_OVERRIDE_OPTIONS                                       \
 215   do {                                                                  \
 216     SUBTARGET_C_COMMON_OVERRIDE_OPTIONS;                                \
 217   } while (0)
 218
 219 #undef SUBTARGET_OVERRIDE_OPTIONS
 220 #define SUBTARGET_OVERRIDE_OPTIONS \
 221 do {                                                                    \
 222   if (TARGET_64BIT && MACHO_DYNAMIC_NO_PIC_P)                           \
 223     target_flags &= ~MASK_MACHO_DYNAMIC_NO_PIC;                         \
 224 } while (0)
 225
 226 /* Darwin on x86_64 uses dwarf-2 by default.  Pre-darwin9 32-bit
 227    compiles default to stabs+.  darwin9+ defaults to dwarf-2.  */
 228 #ifndef DARWIN_PREFER_DWARF
 229 #undef PREFERRED_DEBUGGING_TYPE
 230 #ifdef HAVE_AS_STABS_DIRECTIVE
 231 #define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG)
 232 #else
 233 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 234 #endif
 235 #endif
 236
 237 /* Darwin uses the standard DWARF register numbers but the default
 238    register numbers for STABS.  Fortunately for 64-bit code the
 239    default and the standard are the same.  */
 240 #undef DBX_REGISTER_NUMBER
 241 #define DBX_REGISTER_NUMBER(n)                                  \
 242   (TARGET_64BIT ? dbx64_register_map[n]                         \
 243    : write_symbols == DWARF2_DEBUG ? svr4_dbx_register_map[n]   \
 244    : dbx_register_map[n])
 245
 246 /* Unfortunately, the 32-bit EH information also doesn't use the standard
 247    DWARF register numbers.  */
 248 #define DWARF2_FRAME_REG_OUT(n, for_eh)                                 \
 249   (! (for_eh) || write_symbols != DWARF2_DEBUG || TARGET_64BIT ? (n)    \
 250    : (n) == 5 ? 4                                                       \
 251    : (n) == 4 ? 5                                                       \
 252    : (n) >= 11 && (n) <= 18 ? (n) + 1                                   \
 253    : (n))
 254
 255 #undef REGISTER_SUBTARGET_PRAGMAS
 256 #define REGISTER_SUBTARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS()
 257
 258 #undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES
 259 #define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes
 260
 261 /* For 64-bit, we need to add 4 because @GOTPCREL is relative to the
 262    end of the instruction, but without the 4 we'd only have the right
 263    address for the start of the instruction.  */
 264 #undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
 265 #define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE)     \
 266   if (TARGET_64BIT)                                                             \
 267     {                                                                           \
 268       if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel)                 \
 269         {                                                                       \
 270            fputs (ASM_LONG, FILE);                                              \
 271            assemble_name (FILE, XSTR (ADDR, 0));                                \
 272            fputs ("+4@GOTPCREL", FILE);                                         \
 273            goto DONE;                                                           \
 274         }                                                                       \
 275     }                                                                           \
 276   else                                                                          \
 277     {                                                                           \
 278       if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1))                      \
 279         {                                                                       \
 280           darwin_non_lazy_pcrel (FILE, ADDR);                                   \
 281           goto DONE;                                                            \
 282         }                                                                       \
 283     }
 284
 285 /* This needs to move since i386 uses the first flag and other flags are
 286    used in Mach-O.  */
 287 #undef MACHO_SYMBOL_FLAG_VARIABLE
 288 #define MACHO_SYMBOL_FLAG_VARIABLE ((SYMBOL_FLAG_MACH_DEP) << 3)
 289
 290 #undef MACHOPIC_NL_SYMBOL_PTR_SECTION
 291 #define MACHOPIC_NL_SYMBOL_PTR_SECTION \
 292                 ".section __IMPORT,__pointers,non_lazy_symbol_pointers"
 293
 294 #define SUBTARGET32_DEFAULT_CPU "i686"
 295
 296 #undef  SUBTARGET_INIT_BUILTINS
 297 #define SUBTARGET_INIT_BUILTINS                                 \
 298 do {                                                            \
 299   ix86_builtins[(int) IX86_BUILTIN_CFSTRING]                    \
 300     = darwin_init_cfstring_builtins ((unsigned) (IX86_BUILTIN_CFSTRING));       \
 301   darwin_rename_builtins ();                                    \
 302 } while(0)