gcc/config/rs6000/darwin.h

   1 /* Target definitions for PowerPC running Darwin (Mac OS X).
   2    Copyright (C) 1997, 2000, 2001, 2003 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 it
   8    under the terms of the GNU General Public License as published
   9    by the Free Software Foundation; either version 2, or (at your
  10    option) any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    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 the
  19    Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  20    MA 02111-1307, USA.  */
  21
  22 #undef  TARGET_VERSION
  23 #define TARGET_VERSION fprintf (stderr, " (Darwin/PowerPC)");
  24
  25 /* The "Darwin ABI" is mostly like AIX, but with some key differences.  */
  26
  27 #define DEFAULT_ABI ABI_DARWIN
  28
  29 /* The object file format is Mach-O.  */
  30
  31 #define TARGET_OBJECT_FORMAT OBJECT_MACHO
  32
  33 /* We're not ever going to do TOCs.  */
  34
  35 #define TARGET_TOC 0
  36 #define TARGET_NO_TOC 1
  37
  38 /* Darwin switches.  */
  39 /* Use dynamic-no-pic codegen (no picbase reg; not suitable for shlibs.)  */
  40 #define MASK_MACHO_DYNAMIC_NO_PIC 0x00800000
  41
  42 #define TARGET_DYNAMIC_NO_PIC   (target_flags & MASK_MACHO_DYNAMIC_NO_PIC)
  43
  44 /* Handle #pragma weak and #pragma pack.  */
  45 #define HANDLE_SYSV_PRAGMA 1
  46
  47
  48 #define TARGET_OS_CPP_BUILTINS()                \
  49   do                                            \
  50     {                                           \
  51       builtin_define ("__ppc__");               \
  52       builtin_define ("__POWERPC__");           \
  53       builtin_define ("__NATURAL_ALIGNMENT__"); \
  54       builtin_define ("__MACH__");              \
  55       builtin_define ("__APPLE__");             \
  56     }                                           \
  57   while (0)
  58
  59
  60 /*  */
  61 #undef  SUBTARGET_SWITCHES
  62 #define SUBTARGET_SWITCHES                                              \
  63   {"dynamic-no-pic",    MASK_MACHO_DYNAMIC_NO_PIC,                      \
  64       N_("Generate code suitable for executables (NOT shared libs)")},  \
  65   {"no-dynamic-no-pic", -MASK_MACHO_DYNAMIC_NO_PIC, ""},
  66
  67
  68 /* The Darwin ABI always includes AltiVec, can't be (validly) turned
  69    off.  */
  70
  71 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
  72 do {                                                                    \
  73   rs6000_altivec_abi = 1;                                               \
  74   if (DEFAULT_ABI == ABI_DARWIN)                                        \
  75   {                                                                     \
  76     if (MACHO_DYNAMIC_NO_PIC_P)                                         \
  77       {                                                                 \
  78         if (flag_pic)                                                   \
  79             warning ("-mdynamic-no-pic overrides -fpic or -fPIC");      \
  80         flag_pic = 0;                                                   \
  81       }                                                                 \
  82     else if (flag_pic == 1)                                             \
  83       {                                                                 \
  84         /* Darwin doesn't support -fpic.  */                            \
  85         warning ("-fpic is not supported; -fPIC assumed");              \
  86         flag_pic = 2;                                                   \
  87       }                                                                 \
  88   }                                                                     \
  89 }while(0)
  90
  91 /* We want -fPIC by default, unless we're using -static to compile for
  92    the kernel or some such.  */
  93
  94
  95 #define CC1_SPEC "\
  96 %{static: %{Zdynamic: %e conflicting code gen style switches are used}}\
  97 %{!static:%{!mdynamic-no-pic:-fPIC}}"
  98
  99 /* Make both r2 and r3 available for allocation.  */
 100 #define FIXED_R2 0
 101 #define FIXED_R13 0
 102
 103 /* Base register for access to local variables of the function.  */
 104
 105 #undef  FRAME_POINTER_REGNUM
 106 #define FRAME_POINTER_REGNUM 30
 107
 108 #undef  RS6000_PIC_OFFSET_TABLE_REGNUM
 109 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31
 110
 111 /* Pad the outgoing args area to 16 bytes instead of the usual 8.  */
 112
 113 #undef STARTING_FRAME_OFFSET
 114 #define STARTING_FRAME_OFFSET                                           \
 115   (RS6000_ALIGN (current_function_outgoing_args_size, 16)               \
 116    + RS6000_VARARGS_AREA                                                \
 117    + RS6000_SAVE_AREA)
 118
 119 #undef STACK_DYNAMIC_OFFSET
 120 #define STACK_DYNAMIC_OFFSET(FUNDECL)                                   \
 121   (RS6000_ALIGN (current_function_outgoing_args_size, 16)               \
 122    + (STACK_POINTER_OFFSET))
 123
 124 /* These are used by -fbranch-probabilities */
 125 #define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
 126 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
 127                               "__TEXT,__text2,regular,pure_instructions"
 128
 129 /* Define cutoff for using external functions to save floating point.
 130    Currently on Darwin, always use inline stores.  */
 131
 132 #undef  FP_SAVE_INLINE
 133 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64)
 134
 135 /* Always use the "debug" register names, they're what the assembler
 136    wants to see.  */
 137
 138 #undef REGISTER_NAMES
 139 #define REGISTER_NAMES DEBUG_REGISTER_NAMES
 140
 141 /* This outputs NAME to FILE.  */
 142
 143 #undef  RS6000_OUTPUT_BASENAME
 144 #define RS6000_OUTPUT_BASENAME(FILE, NAME)      \
 145     assemble_name (FILE, NAME);
 146
 147 /* Globalizing directive for a label.  */
 148 #undef GLOBAL_ASM_OP
 149 #define GLOBAL_ASM_OP "\t.globl "
 150 #undef TARGET_ASM_GLOBALIZE_LABEL
 151
 152 /* This is how to output an internal label prefix.  rs6000.c uses this
 153    when generating traceback tables.  */
 154 /* Not really used for Darwin?  */
 155
 156 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
 157 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)   \
 158   fprintf (FILE, "%s", PREFIX)
 159
 160 /* This says how to output an assembler line to define a global common
 161    symbol.  */
 162 /* ? */
 163 #undef  ASM_OUTPUT_ALIGNED_COMMON
 164 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)    \
 165   do { fputs (".comm ", (FILE));                        \
 166        RS6000_OUTPUT_BASENAME ((FILE), (NAME));         \
 167        fprintf ((FILE), ",%d\n", (SIZE)); } while (0)
 168
 169 /* Override the standard rs6000 definition.  */
 170
 171 #undef ASM_COMMENT_START
 172 #define ASM_COMMENT_START ";"
 173
 174 /* FP save and restore routines.  */
 175 #define SAVE_FP_PREFIX "._savef"
 176 #define SAVE_FP_SUFFIX ""
 177 #define RESTORE_FP_PREFIX "._restf"
 178 #define RESTORE_FP_SUFFIX ""
 179
 180 /* This is how to output an assembler line that says to advance
 181    the location counter to a multiple of 2**LOG bytes using the
 182    "nop" instruction as padding.  */
 183
 184 #define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG)                   \
 185   do                                                          \
 186     {                                                         \
 187       if ((LOG) < 3)                                          \
 188         {                                                     \
 189           ASM_OUTPUT_ALIGN (FILE,LOG);                        \
 190         }                                                     \
 191       else /* nop == ori r0,r0,0 */                           \
 192         fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG));  \
 193     } while (0)
 194
 195 /* Generate insns to call the profiler.  */
 196
 197 #define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)
 198
 199 /* Function name to call to do profiling.  */
 200
 201 #define RS6000_MCOUNT "*mcount"
 202
 203 /* Default processor: a G4.  */
 204
 205 #undef PROCESSOR_DEFAULT
 206 #define PROCESSOR_DEFAULT  PROCESSOR_PPC7400
 207
 208 /* Default target flag settings.  Despite the fact that STMW/LMW
 209    serializes, it's still a big codesize win to use them.  Use FSEL by
 210    default as well.  */
 211
 212 #undef  TARGET_DEFAULT
 213 #define TARGET_DEFAULT (MASK_POWERPC | MASK_MULTIPLE | MASK_NEW_MNEMONICS \
 214                       | MASK_PPC_GFXOPT)
 215
 216 /* Since Darwin doesn't do TOCs, stub this out.  */
 217
 218 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)  0
 219
 220 /* Unlike most other PowerPC targets, chars are signed, for
 221    consistency with other Darwin architectures.  */
 222
 223 #undef DEFAULT_SIGNED_CHAR
 224 #define DEFAULT_SIGNED_CHAR (1)
 225
 226 /* Given an rtx X being reloaded into a reg required to be
 227    in class CLASS, return the class of reg to actually use.
 228    In general this is just CLASS; but on some machines
 229    in some cases it is preferable to use a more restrictive class.
 230
 231    On the RS/6000, we have to return NO_REGS when we want to reload a
 232    floating-point CONST_DOUBLE to force it to be copied to memory.
 233
 234    Don't allow R0 when loading the address of, or otherwise furtling with,
 235    a SYMBOL_REF.  */
 236
 237 #undef PREFERRED_RELOAD_CLASS
 238 #define PREFERRED_RELOAD_CLASS(X,CLASS)                 \
 239   (((GET_CODE (X) == CONST_DOUBLE                       \
 240     && GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT)     \
 241    ? NO_REGS                                            \
 242    : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT         \
 243       && (CLASS) == NON_SPECIAL_REGS)                   \
 244    ? GENERAL_REGS                                       \
 245    : (GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH)       \
 246    ? BASE_REGS                                          \
 247    : (CLASS)))
 248
 249 /* Fix for emit_group_load (): force large constants to be pushed via regs.  */
 250 #define ALWAYS_PUSH_CONSTS_USING_REGS_P         1
 251
 252 /* Darwin word-aligns FP doubles but doubleword-aligns 64-bit ints.  */
 253 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 254   (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \
 255               ? get_inner_array_type (FIELD) \
 256               : TREE_TYPE (FIELD)) == DFmode \
 257    ? MIN ((COMPUTED), 32) : (COMPUTED))
 258
 259 /* Darwin increases natural record alignment to doubleword if the first
 260    field is an FP double while the FP fields remain word aligned.  */
 261 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)   \
 262   ((TREE_CODE (STRUCT) == RECORD_TYPE                   \
 263     || TREE_CODE (STRUCT) == UNION_TYPE                 \
 264     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)           \
 265    && TYPE_FIELDS (STRUCT) != 0                         \
 266    && DECL_MODE (TYPE_FIELDS (STRUCT)) == DFmode        \
 267    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 64)            \
 268    : (TARGET_ALTIVEC && TREE_CODE (STRUCT) == VECTOR_TYPE) \
 269    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128)           \
 270    : MAX ((COMPUTED), (SPECIFIED)))
 271
 272 /* XXX: Darwin supports neither .quad, or .llong, but it also doesn't
 273    support 64 bit PowerPC either, so this just keeps things happy.  */
 274 #define DOUBLE_INT_ASM_OP "\t.quad\t"
 275
 276 /* Get HOST_WIDE_INT and CONST_INT to be 32 bits, for compile time
 277    space/speed.  */
 278 #undef MAX_LONG_TYPE_SIZE
 279 #define MAX_LONG_TYPE_SIZE 32
 280
 281 /* For binary compatibility with 2.95; Darwin C APIs use bool from
 282    stdbool.h, which was an int-sized enum in 2.95.  */
 283 #define BOOL_TYPE_SIZE INT_TYPE_SIZE
 284
 285 #undef REGISTER_TARGET_PRAGMAS
 286 #define REGISTER_TARGET_PRAGMAS DARWIN_REGISTER_TARGET_PRAGMAS