gcc/config/i386/cygming.h

   1 /* Operating system specific defines to be used when targeting GCC for
   2    hosting on Windows32, using a Unix style C library and tools.
   3    Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   4    2004, 2005, 2007
   5    Free Software Foundation, Inc.
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 3, or (at your option)
  12 any later version.
  13
  14 GCC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING3.  If not see
  21 <http://www.gnu.org/licenses/>.  */
  22
  23 #define DBX_DEBUGGING_INFO 1
  24 #define SDB_DEBUGGING_INFO 1
  25 #if TARGET_64BIT_DEFAULT || defined (HAVE_GAS_PE_SECREL32_RELOC)
  26 #define DWARF2_DEBUGGING_INFO 1
  27 #endif
  28
  29 #undef PREFERRED_DEBUGGING_TYPE
  30 #if (DWARF2_DEBUGGING_INFO)
  31 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
  32 #else
  33 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  34 #endif
  35
  36 #undef TARGET_64BIT_MS_ABI
  37 #define TARGET_64BIT_MS_ABI TARGET_64BIT
  38
  39 #undef DBX_REGISTER_NUMBER
  40 #define DBX_REGISTER_NUMBER(n)                          \
  41   (TARGET_64BIT ? dbx64_register_map[n]                 \
  42    : (write_symbols == DWARF2_DEBUG                     \
  43       ? svr4_dbx_register_map[n] : dbx_register_map[n]))
  44
  45 /* Map gcc register number to DWARF 2 CFA column number. For 32 bit
  46    target, always use the svr4_dbx_register_map for DWARF .eh_frame
  47    even if we don't use DWARF .debug_frame. */
  48 #undef DWARF_FRAME_REGNUM
  49 #define DWARF_FRAME_REGNUM(n) TARGET_64BIT \
  50         ? dbx64_register_map[(n)] : svr4_dbx_register_map[(n)]
  51
  52 #ifdef HAVE_GAS_PE_SECREL32_RELOC
  53 /* Use section relative relocations for debugging offsets.  Unlike
  54    other targets that fake this by putting the section VMA at 0, PE
  55    won't allow it.  */
  56 #define ASM_OUTPUT_DWARF_OFFSET(FILE, SIZE, LABEL, SECTION)     \
  57   do {                                                          \
  58     if (SIZE != 4)                                              \
  59       abort ();                                                 \
  60                                                                 \
  61     fputs ("\t.secrel32\t", FILE);                              \
  62     assemble_name (FILE, LABEL);                                \
  63   } while (0)
  64 #endif
  65
  66 #define TARGET_EXECUTABLE_SUFFIX ".exe"
  67
  68 #include <stdio.h>
  69
  70 #define MAYBE_UWIN_CPP_BUILTINS() /* Nothing.  */
  71
  72 #define TARGET_OS_CPP_BUILTINS()                                        \
  73   do                                                                    \
  74     {                                                                   \
  75         builtin_define ("_X86_=1");                                     \
  76         builtin_assert ("system=winnt");                                \
  77         builtin_define ("__stdcall=__attribute__((__stdcall__))");      \
  78         builtin_define ("__fastcall=__attribute__((__fastcall__))");    \
  79         builtin_define ("__cdecl=__attribute__((__cdecl__))");          \
  80         if (!flag_iso)                                                  \
  81           {                                                             \
  82             builtin_define ("_stdcall=__attribute__((__stdcall__))");   \
  83             builtin_define ("_fastcall=__attribute__((__fastcall__))"); \
  84             builtin_define ("_cdecl=__attribute__((__cdecl__))");       \
  85           }                                                             \
  86         /* Even though linkonce works with static libs, this is needed  \
  87             to compare typeinfo symbols across dll boundaries.  */      \
  88         builtin_define ("__GXX_MERGED_TYPEINFO_NAMES=0");               \
  89         builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0");            \
  90         MAYBE_UWIN_CPP_BUILTINS ();                                     \
  91         EXTRA_OS_CPP_BUILTINS ();                                       \
  92   }                                                                     \
  93   while (0)
  94
  95 /* Get tree.c to declare a target-specific specialization of
  96    merge_decl_attributes.  */
  97 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1
  98
  99 /* This macro defines names of additional specifications to put in the specs
 100    that can be used in various specifications like CC1_SPEC.  Its definition
 101    is an initializer with a subgrouping for each command option.
 102
 103    Each subgrouping contains a string constant, that defines the
 104    specification name, and a string constant that used by the GCC driver
 105    program.
 106
 107    Do not define this macro if it does not need to do anything.  */
 108
 109 #undef  SUBTARGET_EXTRA_SPECS
 110 #define SUBTARGET_EXTRA_SPECS                                           \
 111   { "mingw_include_path", DEFAULT_TARGET_MACHINE }
 112
 113 #undef MATH_LIBRARY
 114 #define MATH_LIBRARY ""
 115
 116 #define SIZE_TYPE (TARGET_64BIT ? "long long unsigned int" : "unsigned int")
 117 #define PTRDIFF_TYPE (TARGET_64BIT ? "long long int" : "int")
 118
 119 #define WCHAR_TYPE_SIZE 16
 120 #define WCHAR_TYPE "short unsigned int"
 121
 122 /* Windows64 continues to use a 32-bit long type.  */
 123 #undef LONG_TYPE_SIZE
 124 #define LONG_TYPE_SIZE 32
 125 \f
 126 #undef REG_PARM_STACK_SPACE
 127 #define REG_PARM_STACK_SPACE(FNDECL) (TARGET_64BIT_MS_ABI ? 32 : 0)
 128
 129 #undef OUTGOING_REG_PARM_STACK_SPACE
 130 #define OUTGOING_REG_PARM_STACK_SPACE (TARGET_64BIT_MS_ABI ? 1 : 0)
 131
 132 #undef REGPARM_MAX
 133 #define REGPARM_MAX (TARGET_64BIT_MS_ABI ? 4 : 3)
 134
 135 #undef SSE_REGPARM_MAX
 136 #define SSE_REGPARM_MAX (TARGET_64BIT_MS_ABI ? 4 : TARGET_SSE ? 3 : 0)
 137 \f
 138 /* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop).  */
 139 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
 140 /* Enable push_macro & pop_macro */
 141 #define HANDLE_PRAGMA_PUSH_POP_MACRO 1
 142
 143 union tree_node;
 144 #define TREE union tree_node *
 145 \f
 146 #define drectve_section() \
 147   (fprintf (asm_out_file, "\t.section .drectve\n"), \
 148    in_section = NULL)
 149
 150 /* Older versions of gas don't handle 'r' as data.
 151    Explicitly set data flag with 'd'.  */
 152 #define READONLY_DATA_SECTION_ASM_OP "\t.section .rdata,\"dr\""
 153
 154 /* Don't allow flag_pic to propagate since gas may produce invalid code
 155    otherwise.  */
 156
 157 #undef  SUBTARGET_OVERRIDE_OPTIONS
 158 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 159 do {                                                                    \
 160   if (flag_pic)                                                         \
 161     {                                                                   \
 162       warning (0, "-f%s ignored for target (all code is position independent)",\
 163                (flag_pic > 1) ? "PIC" : "pic");                         \
 164       flag_pic = 0;                                                     \
 165     }                                                                   \
 166 } while (0)                                                             \
 167
 168 /* Define this macro if references to a symbol must be treated
 169    differently depending on something about the variable or
 170    function named by the symbol (such as what section it is in).
 171
 172    On i386 running Windows NT, modify the assembler name with a suffix
 173    consisting of an atsign (@) followed by string of digits that represents
 174    the number of bytes of arguments passed to the function, if it has the
 175    attribute STDCALL.
 176
 177    In addition, we must mark dll symbols specially. Definitions of
 178    dllexport'd objects install some info in the .drectve section.
 179    References to dllimport'd objects are fetched indirectly via
 180    _imp__.  If both are declared, dllexport overrides.  This is also
 181    needed to implement one-only vtables: they go into their own
 182    section and we need to set DECL_SECTION_NAME so we do that here.
 183    Note that we can be called twice on the same decl.  */
 184
 185 #define SUBTARGET_ENCODE_SECTION_INFO  i386_pe_encode_section_info
 186
 187 /* Output a common block.  */
 188 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON
 189 #define ASM_OUTPUT_ALIGNED_DECL_COMMON \
 190   i386_pe_asm_output_aligned_decl_common
 191
 192 /* Output the label for an initialized variable.  */
 193 #undef ASM_DECLARE_OBJECT_NAME
 194 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL)     \
 195 do {                                                    \
 196   i386_pe_maybe_record_exported_symbol (DECL, NAME, 1); \
 197   ASM_OUTPUT_LABEL ((STREAM), (NAME));                  \
 198 } while (0)
 199
 200 \f
 201 /* Emit code to check the stack when allocating more than 4000
 202    bytes in one go.  */
 203 #define CHECK_STACK_LIMIT 4000
 204
 205 #undef STACK_BOUNDARY
 206 #define STACK_BOUNDARY  (TARGET_64BIT_MS_ABI ? 128 : BITS_PER_WORD)
 207
 208 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 209    returns float values in the 387 and needs stack probes.
 210    We also align doubles to 64-bits for MSVC default compatibility.  */
 211
 212 #undef TARGET_SUBTARGET_DEFAULT
 213 #define TARGET_SUBTARGET_DEFAULT \
 214         (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS \
 215          | MASK_STACK_PROBE | MASK_ALIGN_DOUBLE)
 216
 217 /* This is how to output an assembler line
 218    that says to advance the location counter
 219    to a multiple of 2**LOG bytes.  */
 220
 221 #undef ASM_OUTPUT_ALIGN
 222 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 223     if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
 224
 225 /* Windows uses explicit import from shared libraries.  */
 226 #define MULTIPLE_SYMBOL_SPACES 1
 227
 228 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section
 229 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 230
 231 #define SUPPORTS_ONE_ONLY 1
 232
 233 /* Switch into a generic section.  */
 234 #define TARGET_ASM_NAMED_SECTION  i386_pe_asm_named_section
 235
 236 /* Select attributes for named sections.  */
 237 #define TARGET_SECTION_TYPE_FLAGS  i386_pe_section_type_flags
 238
 239 /* Write the extra assembler code needed to declare a function
 240    properly.  If we are generating SDB debugging information, this
 241    will happen automatically, so we only need to handle other cases.  */
 242 #undef ASM_DECLARE_FUNCTION_NAME
 243 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 244   do                                                                    \
 245     {                                                                   \
 246       i386_pe_maybe_record_exported_symbol (DECL, NAME, 0);             \
 247       if (write_symbols != SDB_DEBUG)                                   \
 248         i386_pe_declare_function_type (FILE, NAME, TREE_PUBLIC (DECL)); \
 249       ASM_OUTPUT_LABEL (FILE, NAME);                                    \
 250     }                                                                   \
 251   while (0)
 252
 253 /* Add an external function to the list of functions to be declared at
 254    the end of the file.  */
 255 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 256   do                                                                    \
 257     {                                                                   \
 258       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 259         i386_pe_record_external_function ((DECL), (NAME));              \
 260     }                                                                   \
 261   while (0)
 262
 263 /* Declare the type properly for any external libcall.  */
 264 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
 265   i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1)
 266
 267 /* This says out to put a global symbol in the BSS section.  */
 268 #undef ASM_OUTPUT_ALIGNED_BSS
 269 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 270   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 271
 272 /* Output function declarations at the end of the file.  */
 273 #undef TARGET_ASM_FILE_END
 274 #define TARGET_ASM_FILE_END i386_pe_file_end
 275
 276 #undef ASM_COMMENT_START
 277 #define ASM_COMMENT_START " #"
 278
 279 #ifndef DWARF2_UNWIND_INFO
 280 /* 64-bit target uses DWARF2 unwind by default. If 32-bit target
 281    configured with --disable-sjlj-exceptions, use DWARF2, else default
 282    to SJLJ.  */
 283 #if TARGET_64BIT_DEFAULT \
 284     || (defined (CONFIG_SJLJ_EXCEPTIONS) && !CONFIG_SJLJ_EXCEPTIONS)
 285 #define DWARF2_UNWIND_INFO 1
 286 #else
 287 #define DWARF2_UNWIND_INFO 0
 288 #endif
 289 #endif
 290
 291 /* Don't assume anything about the header files.  */
 292 #define NO_IMPLICIT_EXTERN_C
 293
 294 #undef PROFILE_HOOK
 295 #define PROFILE_HOOK(LABEL)                                             \
 296   if (MAIN_NAME_P (DECL_NAME (current_function_decl)))                  \
 297     {                                                                   \
 298       emit_call_insn (gen_rtx_CALL (VOIDmode,                           \
 299         gen_rtx_MEM (FUNCTION_MODE,                                     \
 300                      gen_rtx_SYMBOL_REF (Pmode, "_monstartup")),        \
 301         const0_rtx));                                                   \
 302     }
 303
 304 /* Java Native Interface (JNI) methods on Win32 are invoked using the
 305    stdcall calling convention.  */
 306 #undef MODIFY_JNI_METHOD_CALL
 307 #define MODIFY_JNI_METHOD_CALL(MDECL)                                         \
 308   build_type_attribute_variant ((MDECL),                                      \
 309                                build_tree_list (get_identifier ("stdcall"),   \
 310                                                 NULL))
 311
 312 /* For Win32 ABI compatibility */
 313 #undef DEFAULT_PCC_STRUCT_RETURN
 314 #define DEFAULT_PCC_STRUCT_RETURN 0
 315
 316 /* MSVC returns aggregate types of up to 8 bytes via registers.
 317    See i386.c:ix86_return_in_memory.  */
 318 #undef MS_AGGREGATE_RETURN
 319 #define MS_AGGREGATE_RETURN 1
 320
 321 /* No data type wants to be aligned rounder than this.  */
 322 #undef  BIGGEST_ALIGNMENT
 323 #define BIGGEST_ALIGNMENT 128
 324
 325 /* Biggest alignment supported by the object file format of this
 326    machine.  Use this macro to limit the alignment which can be
 327    specified using the `__attribute__ ((aligned (N)))' construct.  If
 328    not defined, the default value is `BIGGEST_ALIGNMENT'.  */
 329 /* IMAGE_SCN_ALIGN_8192BYTES is the largest section alignment flag
 330    specified in the PECOFF60 spec.  Native MS compiler also limits
 331    user-specified alignment to 8192 bytes.  */
 332 #undef MAX_OFILE_ALIGNMENT
 333 #define MAX_OFILE_ALIGNMENT (8192 * 8)
 334
 335 /* Native complier aligns internal doubles in structures on dword boundaries.  */
 336 #undef  BIGGEST_FIELD_ALIGNMENT
 337 #define BIGGEST_FIELD_ALIGNMENT 64
 338
 339 /* A bit-field declared as `int' forces `int' alignment for the struct.  */
 340 #undef PCC_BITFIELD_TYPE_MATTERS
 341 #define PCC_BITFIELD_TYPE_MATTERS 1
 342 #define GROUP_BITFIELDS_BY_ALIGN TYPE_NATIVE(rec)
 343
 344 /* Enable alias attribute support.  */
 345 #ifndef SET_ASM_OP
 346 #define SET_ASM_OP "\t.set\t"
 347 #endif
 348
 349 /* This implements the `alias' attribute, keeping any stdcall or
 350    fastcall decoration.  */
 351 #undef  ASM_OUTPUT_DEF_FROM_DECLS
 352 #define ASM_OUTPUT_DEF_FROM_DECLS(STREAM, DECL, TARGET)                 \
 353   do                                                                    \
 354     {                                                                   \
 355       const char *alias                                                 \
 356         = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));              \
 357       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 358         i386_pe_declare_function_type (STREAM, alias,                   \
 359                                        TREE_PUBLIC (DECL));             \
 360       ASM_OUTPUT_DEF (STREAM, alias, IDENTIFIER_POINTER (TARGET));      \
 361     } while (0)
 362
 363 /* GNU as supports weak symbols on PECOFF. */
 364 #ifdef HAVE_GAS_WEAK
 365 #define ASM_WEAKEN_LABEL(FILE, NAME)  \
 366   do                                  \
 367     {                                 \
 368       fputs ("\t.weak\t", (FILE));    \
 369       assemble_name ((FILE), (NAME)); \
 370       fputc ('\n', (FILE));           \
 371     }                                 \
 372   while (0)
 373 #endif /* HAVE_GAS_WEAK */
 374
 375 /* FIXME: SUPPORTS_WEAK && TARGET_HAVE_NAMED_SECTIONS is true,
 376    but for .jcr section to work we also need crtbegin and crtend
 377    objects.  */
 378 #define TARGET_USE_JCR_SECTION 0
 379
 380 /* Decide whether it is safe to use a local alias for a virtual function
 381    when constructing thunks.  */
 382 #undef TARGET_USE_LOCAL_THUNK_ALIAS_P
 383 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) (!DECL_ONE_ONLY (DECL))
 384
 385 #define SUBTARGET_ATTRIBUTE_TABLE \
 386   { "selectany", 0, 0, true, false, false, ix86_handle_selectany_attribute }
 387   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
 388
 389 /*  mcount() does not need a counter variable.  */
 390 #undef NO_PROFILE_COUNTERS
 391 #define NO_PROFILE_COUNTERS 1
 392
 393 #define TARGET_VALID_DLLIMPORT_ATTRIBUTE_P i386_pe_valid_dllimport_attribute_p
 394 #define TARGET_CXX_ADJUST_CLASS_AT_DEFINITION i386_pe_adjust_class_at_definition
 395 #define TARGET_MANGLE_DECL_ASSEMBLER_NAME i386_pe_mangle_decl_assembler_name
 396
 397 #undef TREE
 398
 399 #ifndef BUFSIZ
 400 # undef FILE
 401 #endif