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
   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 2, 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 COPYING.  If not, write to
  21 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  22 Boston, MA 02110-1301, USA.  */
  23
  24 #define DBX_DEBUGGING_INFO 1
  25 #define SDB_DEBUGGING_INFO 1
  26 #undef PREFERRED_DEBUGGING_TYPE
  27 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  28
  29 #ifdef HAVE_GAS_PE_SECREL32_RELOC
  30 #define DWARF2_DEBUGGING_INFO 1
  31
  32 #undef DBX_REGISTER_NUMBER
  33 #define DBX_REGISTER_NUMBER(n) (write_symbols == DWARF2_DEBUG   \
  34                                 ? svr4_dbx_register_map[n]      \
  35                                 : dbx_register_map[n])
  36
  37 /* Use section relative relocations for debugging offsets.  Unlike
  38    other targets that fake this by putting the section VMA at 0, PE
  39    won't allow it.  */
  40 #define ASM_OUTPUT_DWARF_OFFSET(FILE, SIZE, LABEL, SECTION)     \
  41   do {                                                          \
  42     if (SIZE != 4)                                              \
  43       abort ();                                                 \
  44                                                                 \
  45     fputs ("\t.secrel32\t", FILE);                              \
  46     assemble_name (FILE, LABEL);                                \
  47   } while (0)
  48 #endif
  49
  50 #define TARGET_EXECUTABLE_SUFFIX ".exe"
  51
  52 #include <stdio.h>
  53
  54 #define MAYBE_UWIN_CPP_BUILTINS() /* Nothing.  */
  55
  56 #define TARGET_OS_CPP_BUILTINS()                                        \
  57   do                                                                    \
  58     {                                                                   \
  59         builtin_define ("_X86_=1");                                     \
  60         builtin_assert ("system=winnt");                                \
  61         builtin_define ("__stdcall=__attribute__((__stdcall__))");      \
  62         builtin_define ("__fastcall=__attribute__((__fastcall__))");    \
  63         builtin_define ("__cdecl=__attribute__((__cdecl__))");          \
  64         if (!flag_iso)                                                  \
  65           {                                                             \
  66             builtin_define ("_stdcall=__attribute__((__stdcall__))");   \
  67             builtin_define ("_fastcall=__attribute__((__fastcall__))"); \
  68             builtin_define ("_cdecl=__attribute__((__cdecl__))");       \
  69           }                                                             \
  70         /* Even though linkonce works with static libs, this is needed  \
  71             to compare typeinfo symbols across dll boundaries.  */      \
  72         builtin_define ("__GXX_MERGED_TYPEINFO_NAMES=0");               \
  73         builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0");            \
  74         MAYBE_UWIN_CPP_BUILTINS ();                                     \
  75         EXTRA_OS_CPP_BUILTINS ();                                       \
  76   }                                                                     \
  77   while (0)
  78
  79 /* Get tree.c to declare a target-specific specialization of
  80    merge_decl_attributes.  */
  81 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1
  82
  83 /* This macro defines names of additional specifications to put in the specs
  84    that can be used in various specifications like CC1_SPEC.  Its definition
  85    is an initializer with a subgrouping for each command option.
  86
  87    Each subgrouping contains a string constant, that defines the
  88    specification name, and a string constant that used by the GCC driver
  89    program.
  90
  91    Do not define this macro if it does not need to do anything.  */
  92
  93 #undef  SUBTARGET_EXTRA_SPECS
  94 #define SUBTARGET_EXTRA_SPECS                                           \
  95   { "mingw_include_path", DEFAULT_TARGET_MACHINE }
  96
  97 #undef MATH_LIBRARY
  98 #define MATH_LIBRARY ""
  99
 100 #define SIZE_TYPE "unsigned int"
 101 #define PTRDIFF_TYPE "int"
 102 #define WCHAR_TYPE_SIZE 16
 103 #define WCHAR_TYPE "short unsigned int"
 104
 105 \f
 106 /* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop).  */
 107 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
 108
 109 union tree_node;
 110 #define TREE union tree_node *
 111 \f
 112 #define drectve_section() \
 113   (fprintf (asm_out_file, "\t.section .drectve\n"), \
 114    in_section = NULL)
 115
 116 /* Older versions of gas don't handle 'r' as data.
 117    Explicitly set data flag with 'd'.  */
 118 #define READONLY_DATA_SECTION_ASM_OP "\t.section .rdata,\"dr\""
 119
 120 /* Don't allow flag_pic to propagate since gas may produce invalid code
 121    otherwise.  */
 122
 123 #undef  SUBTARGET_OVERRIDE_OPTIONS
 124 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 125 do {                                                                    \
 126   if (flag_pic)                                                         \
 127     {                                                                   \
 128       warning (0, "-f%s ignored for target (all code is position independent)",\
 129                (flag_pic > 1) ? "PIC" : "pic");                         \
 130       flag_pic = 0;                                                     \
 131     }                                                                   \
 132 } while (0)                                                             \
 133
 134 /* Define this macro if references to a symbol must be treated
 135    differently depending on something about the variable or
 136    function named by the symbol (such as what section it is in).
 137
 138    On i386 running Windows NT, modify the assembler name with a suffix
 139    consisting of an atsign (@) followed by string of digits that represents
 140    the number of bytes of arguments passed to the function, if it has the
 141    attribute STDCALL.
 142
 143    In addition, we must mark dll symbols specially. Definitions of
 144    dllexport'd objects install some info in the .drectve section.
 145    References to dllimport'd objects are fetched indirectly via
 146    _imp__.  If both are declared, dllexport overrides.  This is also
 147    needed to implement one-only vtables: they go into their own
 148    section and we need to set DECL_SECTION_NAME so we do that here.
 149    Note that we can be called twice on the same decl.  */
 150
 151 #undef SUBTARGET_ENCODE_SECTION_INFO
 152 #define SUBTARGET_ENCODE_SECTION_INFO  i386_pe_encode_section_info
 153 #undef  TARGET_STRIP_NAME_ENCODING
 154 #define TARGET_STRIP_NAME_ENCODING  i386_pe_strip_name_encoding_full
 155 \f
 156 /* Output a reference to a label.  */
 157 #undef ASM_OUTPUT_LABELREF
 158 #define ASM_OUTPUT_LABELREF  i386_pe_output_labelref
 159
 160 #undef  COMMON_ASM_OP
 161 #define COMMON_ASM_OP   "\t.comm\t"
 162
 163 /* Output a common block.  */
 164 #undef ASM_OUTPUT_COMMON
 165 #define ASM_OUTPUT_COMMON(STREAM, NAME, SIZE, ROUNDED)  \
 166 do {                                                    \
 167   if (i386_pe_dllexport_name_p (NAME))                  \
 168     i386_pe_record_exported_symbol (NAME, 1);           \
 169   if (! i386_pe_dllimport_name_p (NAME))                \
 170     {                                                   \
 171       fprintf ((STREAM), "\t.comm\t");                  \
 172       assemble_name ((STREAM), (NAME));                 \
 173       fprintf ((STREAM), ", %d\t%s %d\n",               \
 174                (int)(ROUNDED), ASM_COMMENT_START, (int)(SIZE)); \
 175     }                                                   \
 176 } while (0)
 177
 178 /* Output the label for an initialized variable.  */
 179 #undef ASM_DECLARE_OBJECT_NAME
 180 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL)     \
 181 do {                                                    \
 182   if (i386_pe_dllexport_name_p (NAME))                  \
 183     i386_pe_record_exported_symbol (NAME, 1);           \
 184   ASM_OUTPUT_LABEL ((STREAM), (NAME));                  \
 185 } while (0)
 186
 187 \f
 188 /* Emit code to check the stack when allocating more that 4000
 189    bytes in one go.  */
 190
 191 #define CHECK_STACK_LIMIT 4000
 192
 193 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 194    returns float values in the 387 and needs stack probes.
 195    We also align doubles to 64-bits for MSVC default compatibility.  */
 196
 197 #undef TARGET_SUBTARGET_DEFAULT
 198 #define TARGET_SUBTARGET_DEFAULT \
 199    (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_STACK_PROBE \
 200     | MASK_ALIGN_DOUBLE)
 201
 202 /* This is how to output an assembler line
 203    that says to advance the location counter
 204    to a multiple of 2**LOG bytes.  */
 205
 206 #undef ASM_OUTPUT_ALIGN
 207 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 208     if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
 209
 210 /* Windows uses explicit import from shared libraries.  */
 211 #define MULTIPLE_SYMBOL_SPACES 1
 212
 213 extern void i386_pe_unique_section (TREE, int);
 214 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section
 215 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
 216
 217 #define SUPPORTS_ONE_ONLY 1
 218
 219 /* Switch into a generic section.  */
 220 #define TARGET_ASM_NAMED_SECTION  i386_pe_asm_named_section
 221
 222 /* Select attributes for named sections.  */
 223 #define TARGET_SECTION_TYPE_FLAGS  i386_pe_section_type_flags
 224
 225 /* Write the extra assembler code needed to declare a function
 226    properly.  If we are generating SDB debugging information, this
 227    will happen automatically, so we only need to handle other cases.  */
 228 #undef ASM_DECLARE_FUNCTION_NAME
 229 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 230   do                                                                    \
 231     {                                                                   \
 232       if (i386_pe_dllexport_name_p (NAME))                              \
 233         i386_pe_record_exported_symbol (NAME, 0);                       \
 234       if (write_symbols != SDB_DEBUG)                                   \
 235         i386_pe_declare_function_type (FILE, NAME, TREE_PUBLIC (DECL)); \
 236       ASM_OUTPUT_LABEL (FILE, NAME);                                    \
 237     }                                                                   \
 238   while (0)
 239
 240 /* Add an external function to the list of functions to be declared at
 241    the end of the file.  */
 242 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 243   do                                                                    \
 244     {                                                                   \
 245       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 246         i386_pe_record_external_function ((DECL), (NAME));              \
 247     }                                                                   \
 248   while (0)
 249
 250 /* Declare the type properly for any external libcall.  */
 251 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
 252   i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1)
 253
 254 /* This says out to put a global symbol in the BSS section.  */
 255 #undef ASM_OUTPUT_ALIGNED_BSS
 256 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 257   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 258
 259 /* Output function declarations at the end of the file.  */
 260 #undef TARGET_ASM_FILE_END
 261 #define TARGET_ASM_FILE_END i386_pe_file_end
 262
 263 #undef ASM_COMMENT_START
 264 #define ASM_COMMENT_START " #"
 265
 266 /* DWARF2 Unwinding doesn't work with exception handling yet.  To make
 267    it work, we need to build a libgcc_s.dll, and dcrt0.o should be
 268    changed to call __register_frame_info/__deregister_frame_info.  */
 269 #define DWARF2_UNWIND_INFO 0
 270
 271 /* Don't assume anything about the header files.  */
 272 #define NO_IMPLICIT_EXTERN_C
 273
 274 #undef PROFILE_HOOK
 275 #define PROFILE_HOOK(LABEL)                                             \
 276   if (MAIN_NAME_P (DECL_NAME (current_function_decl)))                  \
 277     {                                                                   \
 278       emit_call_insn (gen_rtx_CALL (VOIDmode,                           \
 279         gen_rtx_MEM (FUNCTION_MODE,                                     \
 280                      gen_rtx_SYMBOL_REF (Pmode, "_monstartup")),        \
 281         const0_rtx));                                                   \
 282     }
 283
 284 /* Java Native Interface (JNI) methods on Win32 are invoked using the
 285    stdcall calling convention.  */
 286 #undef MODIFY_JNI_METHOD_CALL
 287 #define MODIFY_JNI_METHOD_CALL(MDECL)                                         \
 288   build_type_attribute_variant ((MDECL),                                      \
 289                                build_tree_list (get_identifier ("stdcall"),   \
 290                                                 NULL))
 291
 292 /* External function declarations.  */
 293
 294 extern void i386_pe_record_external_function (tree, const char *);
 295 extern void i386_pe_declare_function_type (FILE *, const char *, int);
 296 extern void i386_pe_record_exported_symbol (const char *, int);
 297 extern void i386_pe_file_end (void);
 298 extern int i386_pe_dllexport_name_p (const char *);
 299 extern int i386_pe_dllimport_name_p (const char *);
 300
 301 /* For Win32 ABI compatibility */
 302 #undef DEFAULT_PCC_STRUCT_RETURN
 303 #define DEFAULT_PCC_STRUCT_RETURN 0
 304
 305 /* MSVC returns aggregate types of up to 8 bytes via registers.
 306    See i386.c:ix86_return_in_memory.  */
 307 #undef MS_AGGREGATE_RETURN
 308 #define MS_AGGREGATE_RETURN 1
 309
 310 /* No data type wants to be aligned rounder than this.  */
 311 #undef  BIGGEST_ALIGNMENT
 312 #define BIGGEST_ALIGNMENT 128
 313
 314 /* Biggest alignment supported by the object file format of this
 315    machine.  Use this macro to limit the alignment which can be
 316    specified using the `__attribute__ ((aligned (N)))' construct.  If
 317    not defined, the default value is `BIGGEST_ALIGNMENT'.  */
 318 #undef MAX_OFILE_ALIGNMENT
 319 /* IMAGE_SCN_ALIGN_8192BYTES is the largest section alignment flag
 320    specified in the PECOFF60 spec.  Native MS compiler also limits
 321    user-specified alignment to 8192 bytes.  */
 322 #define MAX_OFILE_ALIGNMENT (8192 * 8)
 323
 324 /* Native complier aligns internal doubles in structures on dword boundaries.  */
 325 #undef  BIGGEST_FIELD_ALIGNMENT
 326 #define BIGGEST_FIELD_ALIGNMENT 64
 327
 328 /* A bit-field declared as `int' forces `int' alignment for the struct.  */
 329 #undef PCC_BITFIELD_TYPE_MATTERS
 330 #define PCC_BITFIELD_TYPE_MATTERS 1
 331 #define GROUP_BITFIELDS_BY_ALIGN TYPE_NATIVE(rec)
 332
 333 /* Enable alias attribute support.  */
 334 #ifndef SET_ASM_OP
 335 #define SET_ASM_OP "\t.set\t"
 336 #endif
 337 /* This implements the `alias' attribute, keeping any stdcall or
 338    fastcall decoration.  */
 339 #undef  ASM_OUTPUT_DEF_FROM_DECLS
 340 #define ASM_OUTPUT_DEF_FROM_DECLS(STREAM, DECL, TARGET)                 \
 341   do                                                                    \
 342     {                                                                   \
 343       const char *alias;                                                \
 344       rtx rtlname = XEXP (DECL_RTL (DECL), 0);                          \
 345       if (GET_CODE (rtlname) == SYMBOL_REF)                             \
 346         alias = XSTR (rtlname, 0);                                      \
 347       else                                                              \
 348         abort ();                                                       \
 349       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 350         i386_pe_declare_function_type (STREAM, alias,                   \
 351                                        TREE_PUBLIC (DECL));             \
 352       ASM_OUTPUT_DEF (STREAM, alias, IDENTIFIER_POINTER (TARGET));      \
 353     } while (0)
 354
 355 /* GNU as supports weak symbols on PECOFF. */
 356 #ifdef HAVE_GAS_WEAK
 357 #define ASM_WEAKEN_LABEL(FILE, NAME)  \
 358   do                                  \
 359     {                                 \
 360       fputs ("\t.weak\t", (FILE));    \
 361       assemble_name ((FILE), (NAME)); \
 362       fputc ('\n', (FILE));           \
 363     }                                 \
 364   while (0)
 365 #endif /* HAVE_GAS_WEAK */
 366
 367 /* FIXME: SUPPORTS_WEAK && TARGET_HAVE_NAMED_SECTIONS is true,
 368    but for .jcr section to work we also need crtbegin and crtend
 369    objects.  */
 370 #define TARGET_USE_JCR_SECTION 0
 371
 372 /* Decide whether it is safe to use a local alias for a virtual function
 373    when constructing thunks.  */
 374 #undef TARGET_USE_LOCAL_THUNK_ALIAS_P
 375 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) (!DECL_ONE_ONLY (DECL))
 376
 377 #define SUBTARGET_ATTRIBUTE_TABLE \
 378   /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ \
 379   { "selectany", 0, 0, true, false, false, ix86_handle_selectany_attribute }
 380
 381 /*  mcount() does not need a counter variable.  */
 382 #undef NO_PROFILE_COUNTERS
 383 #define NO_PROFILE_COUNTERS 1
 384
 385 #define TARGET_VALID_DLLIMPORT_ATTRIBUTE_P i386_pe_valid_dllimport_attribute_p
 386 #define TARGET_CXX_ADJUST_CLASS_AT_DEFINITION i386_pe_adjust_class_at_definition
 387
 388 #undef TREE
 389
 390 #ifndef BUFSIZ
 391 # undef FILE
 392 #endif