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 CPP_PREDEFINES "-D__ppc__ -D__POWERPC__ -D__NATURAL_ALIGNMENT__ -D__MACH__ -D__BIG_ENDIAN__ -D__APPLE__"
  48
  49 /* We want -fPIC by default, unless we're using -static to compile for
  50    the kernel or some such.  */
  51
  52 #define CC1_SPEC "%{!static:-fPIC}"
  53
  54 /* Make both r2 and r3 available for allocation.  */
  55 #define FIXED_R2 0
  56 #define FIXED_R13 0
  57
  58 /* Base register for access to local variables of the function.  */
  59
  60 #undef  FRAME_POINTER_REGNUM
  61 #define FRAME_POINTER_REGNUM 30
  62
  63 #undef  RS6000_PIC_OFFSET_TABLE_REGNUM
  64 #define RS6000_PIC_OFFSET_TABLE_REGNUM 31
  65
  66 /* Pad the outgoing args area to 16 bytes instead of the usual 8.  */
  67
  68 #undef STARTING_FRAME_OFFSET
  69 #define STARTING_FRAME_OFFSET                                           \
  70   (RS6000_ALIGN (current_function_outgoing_args_size, 16)               \
  71    + RS6000_VARARGS_AREA                                                \
  72    + RS6000_SAVE_AREA)
  73
  74 #undef STACK_DYNAMIC_OFFSET
  75 #define STACK_DYNAMIC_OFFSET(FUNDECL)                                   \
  76   (RS6000_ALIGN (current_function_outgoing_args_size, 16)               \
  77    + (STACK_POINTER_OFFSET))
  78
  79 /* Define cutoff for using external functions to save floating point.
  80    Currently on Darwin, always use inline stores.  */
  81
  82 #undef  FP_SAVE_INLINE
  83 #define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64)
  84
  85 /* Always use the "debug" register names, they're what the assembler
  86    wants to see.  */
  87
  88 #undef REGISTER_NAMES
  89 #define REGISTER_NAMES DEBUG_REGISTER_NAMES
  90
  91 /* This outputs NAME to FILE.  */
  92
  93 #undef  RS6000_OUTPUT_BASENAME
  94 #define RS6000_OUTPUT_BASENAME(FILE, NAME)      \
  95     assemble_name (FILE, NAME);
  96
  97 /* Output before instructions.  */
  98 /* This is how to output the definition of a user-level label named NAME,
  99    such as the label on a static function or variable NAME.  */
 100
 101 #define ASM_OUTPUT_LABEL(FILE,NAME)     \
 102   do { assemble_name (FILE, NAME); fputs (":\n", FILE); } while (0)
 103
 104 /* This is how to output a command to make the user-level label named NAME
 105    defined for reference from other files.  */
 106
 107 #undef ASM_GLOBALIZE_LABEL
 108 #define ASM_GLOBALIZE_LABEL(FILE,NAME)  \
 109   do { fputs ("\t.globl ", FILE);       \
 110        RS6000_OUTPUT_BASENAME (FILE, NAME); putc ('\n', FILE);} while (0)
 111
 112 /* This is how to output an internal label prefix.  rs6000.c uses this
 113    when generating traceback tables.  */
 114 /* Not really used for Darwin?  */
 115
 116 #undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
 117 #define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX)   \
 118   fprintf (FILE, "%s", PREFIX)
 119
 120 #undef TEXT_SECTION_ASM_OP
 121 #define TEXT_SECTION_ASM_OP ".text"
 122
 123 /* Output before writable data.  */
 124
 125 #undef DATA_SECTION_ASM_OP
 126 #define DATA_SECTION_ASM_OP ".data"
 127
 128 /* This says how to output an assembler line to define a global common
 129    symbol.  */
 130 /* ? */
 131 #undef  ASM_OUTPUT_ALIGNED_COMMON
 132 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)    \
 133   do { fputs (".comm ", (FILE));                        \
 134        RS6000_OUTPUT_BASENAME ((FILE), (NAME));         \
 135        fprintf ((FILE), ",%d\n", (SIZE)); } while (0)
 136
 137 #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
 138   fprintf (FILE, "\t.space %d\n", SIZE)
 139
 140 /* Override the standard rs6000 definition.  */
 141
 142 #undef ASM_COMMENT_START
 143 #define ASM_COMMENT_START ";"
 144
 145 /* FP save and restore routines.  */
 146 #define SAVE_FP_PREFIX "._savef"
 147 #define SAVE_FP_SUFFIX ""
 148 #define RESTORE_FP_PREFIX "._restf"
 149 #define RESTORE_FP_SUFFIX ""
 150
 151 /* Generate insns to call the profiler.  */
 152
 153 #define PROFILE_HOOK(LABEL)   output_profile_hook (LABEL)
 154
 155 /* Function name to call to do profiling.  */
 156
 157 #define RS6000_MCOUNT "*mcount"
 158
 159 /* Default processor: a G4.  */
 160
 161 #undef PROCESSOR_DEFAULT
 162 #define PROCESSOR_DEFAULT  PROCESSOR_PPC7400
 163
 164 /* Default target flag settings.  Despite the fact that STMW/LMW
 165    serializes, it's still a big codesize win to use them.  Use FSEL by
 166    default as well.  */
 167
 168 #undef  TARGET_DEFAULT
 169 #define TARGET_DEFAULT (MASK_POWERPC | MASK_MULTIPLE | MASK_NEW_MNEMONICS \
 170                       | MASK_PPC_GFXOPT)
 171
 172 /* Since Darwin doesn't do TOCs, stub this out.  */
 173
 174 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)  0
 175
 176 /* Unlike most other PowerPC targets, chars are signed, for
 177    consistency with other Darwin architectures.  */
 178
 179 #undef DEFAULT_SIGNED_CHAR
 180 #define DEFAULT_SIGNED_CHAR (1)
 181
 182 /* Given an rtx X being reloaded into a reg required to be
 183    in class CLASS, return the class of reg to actually use.
 184    In general this is just CLASS; but on some machines
 185    in some cases it is preferable to use a more restrictive class.
 186
 187    On the RS/6000, we have to return NO_REGS when we want to reload a
 188    floating-point CONST_DOUBLE to force it to be copied to memory.
 189
 190    Don't allow R0 when loading the address of, or otherwise furtling with,
 191    a SYMBOL_REF.  */
 192
 193 #undef PREFERRED_RELOAD_CLASS
 194 #define PREFERRED_RELOAD_CLASS(X,CLASS)                 \
 195   (((GET_CODE (X) == CONST_DOUBLE                       \
 196     && GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT)     \
 197    ? NO_REGS                                            \
 198    : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT         \
 199       && (CLASS) == NON_SPECIAL_REGS)                   \
 200    ? GENERAL_REGS                                       \
 201    : (GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH)       \
 202    ? BASE_REGS                                          \
 203    : (CLASS)))
 204
 205 /* Fix for emit_group_load (): force large constants to be pushed via regs.  */
 206 #define ALWAYS_PUSH_CONSTS_USING_REGS_P         1
 207
 208 /* Darwin word-aligns FP doubles but doubleword-aligns 64-bit ints.  */
 209 #define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
 210   (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \
 211               ? get_inner_array_type (FIELD) \
 212               : TREE_TYPE (FIELD)) == DFmode \
 213    ? MIN ((COMPUTED), 32) : (COMPUTED))
 214
 215 /* Darwin increases natural record alignment to doubleword if the first
 216    field is an FP double while the FP fields remain word aligned.  */
 217 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)   \
 218   ((TREE_CODE (STRUCT) == RECORD_TYPE                   \
 219     || TREE_CODE (STRUCT) == UNION_TYPE                 \
 220     || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)           \
 221    && TYPE_FIELDS (STRUCT) != 0                         \
 222    && DECL_MODE (TYPE_FIELDS (STRUCT)) == DFmode        \
 223    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 64)            \
 224    : (TARGET_ALTIVEC && TREE_CODE (STRUCT) == VECTOR_TYPE) \
 225    ? MAX (MAX ((COMPUTED), (SPECIFIED)), 128)           \
 226    : MAX ((COMPUTED), (SPECIFIED)))
 227
 228 /* XXX: Darwin supports neither .quad, or .llong, but it also doesn't
 229    support 64 bit powerpc either, so this just keeps things happy.  */
 230 #define DOUBLE_INT_ASM_OP "\t.quad\t"
 231
 232 /* Get HOST_WIDE_INT and CONST_INT to be 32 bits, for compile time
 233    space/speed.  */
 234 #undef MAX_LONG_TYPE_SIZE
 235 #define MAX_LONG_TYPE_SIZE 32
 236
 237 /* For binary compatibility with 2.95; Darwin C APIs use bool from
 238    stdbool.h, which was an int-sized enum in 2.95.  */
 239 #define BOOL_TYPE_SIZE INT_TYPE_SIZE