gcc/config/rs6000/darwin.h

   1 /* Target definitions for PowerPC running Darwin (Mac OS X).
   2    Copyright (C) 1997, 2000, 2001 Free Software Foundation, Inc.
   3    Contributed by Apple Computer Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC 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 2, or (at your option)
  10 any later version.
  11
  12 GNU CC 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 GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, 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 /* Handle #pragma weak and #pragma pack.  */
  39 #define HANDLE_SYSV_PRAGMA
  40
  41 /* The Darwin ABI always includes AltiVec, can't be (validly) turned
  42    off.  */
  43
  44 #define SUBTARGET_OVERRIDE_OPTIONS  \
  45   rs6000_altivec_abi = 1;
  46
  47 #define TARGET_OS_CPP_BUILTINS()                \
  48   do                                            \
  49     {                                           \
  50       builtin_define ("__ppc__");               \
  51       builtin_define ("__POWERPC__");           \
  52       builtin_define ("__NATURAL_ALIGNMENT__"); \
  53       builtin_define ("__MACH__");              \
  54       builtin_define ("__APPLE__");             \
  55     }                                           \
  56   while (0)
  57
  58 /* We want -fPIC by default, unless we're using -static to compile for
  59    the kernel or some such.  */
  60
  61 #define CC1_SPEC "%{!static:-fPIC}"
  62
  63 /* Make both r2 and r3 available for allocation.  */
  64 #define FIXED_R2 0
  65 #define FIXED_R13 0
  66
  67 /* Base register for access to local variables of the function.  */
  68
  69 #undef  FRAME_POINTER_REGNUM
  70 #define FRAME_POINTER_REGNUM 30
  71
  72 #undef  RS6000_PIC_OFFSET_TABLE_REGNUM
  73 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31
  74
  75 /* Pad the outgoing args area to 16 bytes instead of the usual 8.  */
  76
  77 #undef STARTING_FRAME_OFFSET
  78 #define STARTING_FRAME_OFFSET                                           \
  79   (RS6000_ALIGN (current_function_outgoing_args_size, 16)               \
  80    + RS6000_VARARGS_AREA                                                \
  81    + RS6000_SAVE_AREA)
  82
  83 #undef STACK_DYNAMIC_OFFSET
  84 #define STACK_DYNAMIC_OFFSET(FUNDECL)                                   \
  85   (RS6000_ALIGN (current_function_outgoing_args_size, 16)               \
  86    + (STACK_POINTER_OFFSET))
  87
  88 /* Define cutoff for using external functions to save floating point.
  89    Currently on Darwin, always use inline stores.  */
  90
  91 #undef  FP_SAVE_INLINE
  92 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64)
  93
  94 /* Always use the "debug" register names, they're what the assembler
  95    wants to see.  */
  96
  97 #undef REGISTER_NAMES
  98 #define REGISTER_NAMES DEBUG_REGISTER_NAMES
  99
 100 /* This outputs NAME to FILE.  */
 101
 102 #undef  RS6000_OUTPUT_BASENAME
 103 #define RS6000_OUTPUT_BASENAME(FILE, NAME)      \
 104     assemble_name (FILE, NAME);
 105
 106 /* Globalizing directive for a label.  */
 107 #undef GLOBAL_ASM_OP
 108 #define GLOBAL_ASM_OP "\t.globl "
 109 #undef TARGET_ASM_GLOBALIZE_LABEL
 110
 111 /* This is how to output an internal label prefix.  rs6000.c uses this
 112    when generating traceback tables.  */
 113 /* Not really used for Darwin?  */
 114
 115 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
 116 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)   \
 117   fprintf (FILE, "%s", PREFIX)
 118
 119 /* This says how to output an assembler line to define a global common
 120    symbol.  */
 121 /* ? */
 122 #undef  ASM_OUTPUT_ALIGNED_COMMON
 123 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)    \
 124   do { fputs (".comm ", (FILE));                        \
 125        RS6000_OUTPUT_BASENAME ((FILE), (NAME));         \
 126        fprintf ((FILE), ",%d\n", (SIZE)); } while (0)
 127
 128 /* Override the standard rs6000 definition.  */
 129
 130 #undef ASM_COMMENT_START
 131 #define ASM_COMMENT_START ";"
 132
 133 /* FP save and restore routines.  */
 134 #define SAVE_FP_PREFIX "._savef"
 135 #define SAVE_FP_SUFFIX ""
 136 #define RESTORE_FP_PREFIX "._restf"
 137 #define RESTORE_FP_SUFFIX ""
 138
 139 /* Generate insns to call the profiler.  */
 140
 141 #define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)
 142
 143 /* Function name to call to do profiling.  */
 144
 145 #define RS6000_MCOUNT "*mcount"
 146
 147 /* Default processor: a G4.  */
 148
 149 #undef PROCESSOR_DEFAULT
 150 #define PROCESSOR_DEFAULT  PROCESSOR_PPC7400
 151
 152 /* Default target flag settings.  Despite the fact that STMW/LMW
 153    serializes, it's still a big codesize win to use them.  Use FSEL by
 154    default as well.  */
 155
 156 #undef  TARGET_DEFAULT
 157 #define TARGET_DEFAULT (MASK_POWERPC | MASK_MULTIPLE | MASK_NEW_MNEMONICS \
 158                       | MASK_PPC_GFXOPT)
 159
 160 /* Since Darwin doesn't do TOCs, stub this out.  */
 161
 162 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)  0
 163
 164 /* Unlike most other PowerPC targets, chars are signed, for
 165    consistency with other Darwin architectures.  */
 166
 167 #undef DEFAULT_SIGNED_CHAR
 168 #define DEFAULT_SIGNED_CHAR (1)
 169
 170 /* Given an rtx X being reloaded into a reg required to be
 171    in class CLASS, return the class of reg to actually use.
 172    In general this is just CLASS; but on some machines
 173    in some cases it is preferable to use a more restrictive class.
 174
 175    On the RS/6000, we have to return NO_REGS when we want to reload a
 176    floating-point CONST_DOUBLE to force it to be copied to memory.
 177
 178    Don't allow R0 when loading the address of, or otherwise furtling with,
 179    a SYMBOL_REF.  */
 180
 181 #undef PREFERRED_RELOAD_CLASS
 182 #define PREFERRED_RELOAD_CLASS(X,CLASS)                 \
 183   (((GET_CODE (X) == CONST_DOUBLE                       \
 184     && GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT)     \
 185    ? NO_REGS                                            \
 186    : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT         \
 187       && (CLASS) == NON_SPECIAL_REGS)                   \
 188    ? GENERAL_REGS                                       \
 189    : (GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH)       \
 190    ? BASE_REGS                                          \
 191    : (CLASS)))
 192
 193 /* Fix for emit_group_load (): force large constants to be pushed via regs.  */
 194 #define ALWAYS_PUSH_CONSTS_USING_REGS_P         1
 195
 196 /* Darwin word-aligns FP doubles but doubleword-aligns 64-bit ints.  */
 197 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 198   (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \
 199               ? get_inner_array_type (FIELD) \
 200               : TREE_TYPE (FIELD)) == DFmode \
 201    ? MIN ((COMPUTED), 32) : (COMPUTED))
 202
 203 /* Darwin increases natural record alignment to doubleword if the first
 204    field is an FP double while the FP fields remain word aligned.  */
 205 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)   \
 206   ((TREE_CODE (STRUCT) == RECORD_TYPE                   \
 207     || TREE_CODE (STRUCT) == UNION_TYPE                 \
 208     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)           \
 209    && TYPE_FIELDS (STRUCT) != 0                         \
 210    && DECL_MODE (TYPE_FIELDS (STRUCT)) == DFmode        \
 211    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 64)            \
 212    : (TARGET_ALTIVEC && TREE_CODE (STRUCT) == VECTOR_TYPE) \
 213    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128)           \
 214    : MAX ((COMPUTED), (SPECIFIED)))
 215
 216 /* XXX: Darwin supports neither .quad, or .llong, but it also doesn't
 217    support 64 bit PowerPC either, so this just keeps things happy.  */
 218 #define DOUBLE_INT_ASM_OP "\t.quad\t"
 219
 220 /* Get HOST_WIDE_INT and CONST_INT to be 32 bits, for compile time
 221    space/speed.  */
 222 #undef MAX_LONG_TYPE_SIZE
 223 #define MAX_LONG_TYPE_SIZE 32
 224
 225 /* For binary compatibility with 2.95; Darwin C APIs use bool from
 226    stdbool.h, which was an int-sized enum in 2.95.  */
 227 #define BOOL_TYPE_SIZE INT_TYPE_SIZE
 228
 229 #undef REGISTER_TARGET_PRAGMAS
 230 #define REGISTER_TARGET_PRAGMAS DARWIN_REGISTER_TARGET_PRAGMAS