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, 2004
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA.  */
  22
  23 #define DBX_DEBUGGING_INFO 1
  24 #define SDB_DEBUGGING_INFO 1
  25 #undef PREFERRED_DEBUGGING_TYPE
  26 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  27
  28 #ifdef HAVE_GAS_PE_SECREL32_RELOC
  29 #define DWARF2_DEBUGGING_INFO 1
  30
  31 #undef DBX_REGISTER_NUMBER
  32 #define DBX_REGISTER_NUMBER(n) (write_symbols == DWARF2_DEBUG   \
  33                                 ? svr4_dbx_register_map[n]      \
  34                                 : dbx_register_map[n])
  35
  36 /* Use section relative relocations for debugging offsets.  Unlike
  37    other targets that fake this by putting the section VMA at 0, PE
  38    won't allow it.  */
  39 #define ASM_OUTPUT_DWARF_OFFSET(FILE, SIZE, LABEL)    \
  40   do {                                                \
  41     if (SIZE != 4)                                    \
  42       abort ();                                       \
  43                                                       \
  44     fputs ("\t.secrel32\t", FILE);                    \
  45     assemble_name (FILE, LABEL);                      \
  46   } while (0)
  47 #endif
  48
  49 #define TARGET_EXECUTABLE_SUFFIX ".exe"
  50
  51 #include <stdio.h>
  52
  53 /* Masks for subtarget switches used by other files.  */
  54 #define MASK_NOP_FUN_DLLIMPORT 0x08000000 /* Ignore dllimport for functions */
  55
  56 /* Used in winnt.c.  */
  57 #define TARGET_NOP_FUN_DLLIMPORT (target_flags & MASK_NOP_FUN_DLLIMPORT)
  58
  59 #undef  SUBTARGET_SWITCHES
  60 #define SUBTARGET_SWITCHES \
  61 { "cygwin",               0, N_("Use the Cygwin interface") },  \
  62 { "no-cygwin",            0, N_("Use the Mingw32 interface") }, \
  63 { "windows",              0, N_("Create GUI application") },    \
  64 { "no-win32",             0, N_("Don't set Windows defines") }, \
  65 { "win32",                0, N_("Set Windows defines") },       \
  66 { "console",              0, N_("Create console application") },\
  67 { "dll",                  0, N_("Generate code for a DLL") },   \
  68 { "nop-fun-dllimport",    MASK_NOP_FUN_DLLIMPORT,               \
  69   N_("Ignore dllimport for functions") },                       \
  70 { "no-nop-fun-dllimport", -MASK_NOP_FUN_DLLIMPORT, "" },        \
  71 { "threads",              0, N_("Use Mingw-specific thread support") },
  72
  73 #define MAYBE_UWIN_CPP_BUILTINS() /* Nothing.  */
  74
  75 #define TARGET_OS_CPP_BUILTINS()                                        \
  76   do                                                                    \
  77     {                                                                   \
  78         builtin_define ("_X86_=1");                                     \
  79         builtin_assert ("system=winnt");                                \
  80         builtin_define ("__stdcall=__attribute__((__stdcall__))");      \
  81         builtin_define ("__fastcall=__attribute__((__fastcall__))");    \
  82         builtin_define ("__cdecl=__attribute__((__cdecl__))");          \
  83         if (!flag_iso)                                                  \
  84           {                                                             \
  85             builtin_define ("_stdcall=__attribute__((__stdcall__))");   \
  86             builtin_define ("_fastcall=__attribute__((__fastcall__))"); \
  87             builtin_define ("_cdecl=__attribute__((__cdecl__))");       \
  88           }                                                             \
  89         MAYBE_UWIN_CPP_BUILTINS ();                                     \
  90         EXTRA_OS_CPP_BUILTINS ();                                       \
  91   }                                                                     \
  92   while (0)
  93
  94 /* Get tree.c to declare a target-specific specialization of
  95    merge_decl_attributes.  */
  96 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1
  97
  98 /* This macro defines names of additional specifications to put in the specs
  99    that can be used in various specifications like CC1_SPEC.  Its definition
 100    is an initializer with a subgrouping for each command option.
 101
 102    Each subgrouping contains a string constant, that defines the
 103    specification name, and a string constant that used by the GCC driver
 104    program.
 105
 106    Do not define this macro if it does not need to do anything.  */
 107
 108 #undef  SUBTARGET_EXTRA_SPECS
 109 #define SUBTARGET_EXTRA_SPECS                                           \
 110   { "mingw_include_path", DEFAULT_TARGET_MACHINE }
 111
 112 #undef MATH_LIBRARY
 113 #define MATH_LIBRARY ""
 114
 115 #define SIZE_TYPE "unsigned int"
 116 #define PTRDIFF_TYPE "int"
 117 #define WCHAR_TYPE_SIZE 16
 118 #define WCHAR_TYPE "short unsigned int"
 119
 120 \f
 121 /* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop).  */
 122 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
 123
 124 union tree_node;
 125 #define TREE union tree_node *
 126 \f
 127 #undef EXTRA_SECTIONS
 128 #define EXTRA_SECTIONS in_drectve
 129
 130 #undef EXTRA_SECTION_FUNCTIONS
 131 #define EXTRA_SECTION_FUNCTIONS                                 \
 132   DRECTVE_SECTION_FUNCTION                                      \
 133   SWITCH_TO_SECTION_FUNCTION
 134
 135 #define DRECTVE_SECTION_FUNCTION \
 136 void                                                                    \
 137 drectve_section (void)                                                  \
 138 {                                                                       \
 139   if (in_section != in_drectve)                                         \
 140     {                                                                   \
 141       fprintf (asm_out_file, "%s\n", "\t.section .drectve\n");          \
 142       in_section = in_drectve;                                          \
 143     }                                                                   \
 144 }
 145 void drectve_section (void);
 146
 147 /* Older versions of gas don't handle 'r' as data.
 148    Explicitly set data flag with 'd'.  */
 149 #define READONLY_DATA_SECTION_ASM_OP "\t.section .rdata,\"dr\""
 150
 151 /* Switch to SECTION (an `enum in_section').
 152
 153    ??? This facility should be provided by GCC proper.
 154    The problem is that we want to temporarily switch sections in
 155    ASM_DECLARE_OBJECT_NAME and then switch back to the original section
 156    afterwards.  */
 157 #define SWITCH_TO_SECTION_FUNCTION                              \
 158 void switch_to_section (enum in_section, tree);                 \
 159 void                                                            \
 160 switch_to_section (enum in_section section, tree decl)          \
 161 {                                                               \
 162   switch (section)                                              \
 163     {                                                           \
 164       case in_text: text_section (); break;                     \
 165       case in_data: data_section (); break;                     \
 166       case in_readonly_data: readonly_data_section (); break;   \
 167       case in_named: named_section (decl, NULL, 0); break;      \
 168       case in_drectve: drectve_section (); break;               \
 169       default: abort (); break;                         \
 170     }                                                           \
 171 }
 172
 173 /* Don't allow flag_pic to propagate since gas may produce invalid code
 174    otherwise.  */
 175
 176 #undef  SUBTARGET_OVERRIDE_OPTIONS
 177 #define SUBTARGET_OVERRIDE_OPTIONS                                      \
 178 do {                                                                    \
 179   if (flag_pic)                                                         \
 180     {                                                                   \
 181       warning ("-f%s ignored for target (all code is position independent)",\
 182                (flag_pic > 1) ? "PIC" : "pic");                         \
 183       flag_pic = 0;                                                     \
 184     }                                                                   \
 185 } while (0)                                                             \
 186
 187 /* Define this macro if references to a symbol must be treated
 188    differently depending on something about the variable or
 189    function named by the symbol (such as what section it is in).
 190
 191    On i386 running Windows NT, modify the assembler name with a suffix
 192    consisting of an atsign (@) followed by string of digits that represents
 193    the number of bytes of arguments passed to the function, if it has the
 194    attribute STDCALL.
 195
 196    In addition, we must mark dll symbols specially. Definitions of
 197    dllexport'd objects install some info in the .drectve section.
 198    References to dllimport'd objects are fetched indirectly via
 199    _imp__.  If both are declared, dllexport overrides.  This is also
 200    needed to implement one-only vtables: they go into their own
 201    section and we need to set DECL_SECTION_NAME so we do that here.
 202    Note that we can be called twice on the same decl.  */
 203
 204 #undef TARGET_ENCODE_SECTION_INFO
 205 #define TARGET_ENCODE_SECTION_INFO  i386_pe_encode_section_info
 206 #undef  TARGET_STRIP_NAME_ENCODING
 207 #define TARGET_STRIP_NAME_ENCODING  i386_pe_strip_name_encoding_full
 208 \f
 209 /* Output a reference to a label.  */
 210 #undef ASM_OUTPUT_LABELREF
 211 #define ASM_OUTPUT_LABELREF  i386_pe_output_labelref
 212
 213 /* Output a common block.  */
 214 #undef ASM_OUTPUT_COMMON
 215 #define ASM_OUTPUT_COMMON(STREAM, NAME, SIZE, ROUNDED)  \
 216 do {                                                    \
 217   if (i386_pe_dllexport_name_p (NAME))                  \
 218     i386_pe_record_exported_symbol (NAME, 1);           \
 219   if (! i386_pe_dllimport_name_p (NAME))                \
 220     {                                                   \
 221       fprintf ((STREAM), "\t.comm\t");                  \
 222       assemble_name ((STREAM), (NAME));                 \
 223       fprintf ((STREAM), ", %d\t%s %d\n",               \
 224                (int)(ROUNDED), ASM_COMMENT_START, (int)(SIZE)); \
 225     }                                                   \
 226 } while (0)
 227
 228 /* Output the label for an initialized variable.  */
 229 #undef ASM_DECLARE_OBJECT_NAME
 230 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL)     \
 231 do {                                                    \
 232   if (i386_pe_dllexport_name_p (NAME))                  \
 233     i386_pe_record_exported_symbol (NAME, 1);           \
 234   ASM_OUTPUT_LABEL ((STREAM), (NAME));                  \
 235 } while (0)
 236
 237 \f
 238 /* Emit code to check the stack when allocating more that 4000
 239    bytes in one go.  */
 240
 241 #define CHECK_STACK_LIMIT 4000
 242
 243 /* By default, target has a 80387, uses IEEE compatible arithmetic,
 244    returns float values in the 387 and needs stack probes.
 245    We also align doubles to 64-bits for MSVC default compatibility.  */
 246
 247 #undef TARGET_SUBTARGET_DEFAULT
 248 #define TARGET_SUBTARGET_DEFAULT \
 249    (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_STACK_PROBE \
 250     | MASK_ALIGN_DOUBLE)
 251
 252 /* This is how to output an assembler line
 253    that says to advance the location counter
 254    to a multiple of 2**LOG bytes.  */
 255
 256 #undef ASM_OUTPUT_ALIGN
 257 #define ASM_OUTPUT_ALIGN(FILE,LOG)      \
 258     if ((LOG)!=0) fprintf ((FILE), "\t.align %d\n", 1<<(LOG))
 259
 260 /* Define this macro if in some cases global symbols from one translation
 261    unit may not be bound to undefined symbols in another translation unit
 262    without user intervention.  For instance, under Microsoft Windows
 263    symbols must be explicitly imported from shared libraries (DLLs).  */
 264 #define MULTIPLE_SYMBOL_SPACES
 265
 266 extern void i386_pe_unique_section (TREE, int);
 267 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section
 268
 269 #define SUPPORTS_ONE_ONLY 1
 270
 271 /* Switch into a generic section.  */
 272 #define TARGET_ASM_NAMED_SECTION  i386_pe_asm_named_section
 273
 274 /* Select attributes for named sections.  */
 275 #define TARGET_SECTION_TYPE_FLAGS  i386_pe_section_type_flags
 276
 277 /* Write the extra assembler code needed to declare a function
 278    properly.  If we are generating SDB debugging information, this
 279    will happen automatically, so we only need to handle other cases.  */
 280 #undef ASM_DECLARE_FUNCTION_NAME
 281 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)                     \
 282   do                                                                    \
 283     {                                                                   \
 284       if (i386_pe_dllexport_name_p (NAME))                              \
 285         i386_pe_record_exported_symbol (NAME, 0);                       \
 286       if (write_symbols != SDB_DEBUG)                                   \
 287         i386_pe_declare_function_type (FILE, NAME, TREE_PUBLIC (DECL)); \
 288       ASM_OUTPUT_LABEL (FILE, NAME);                                    \
 289     }                                                                   \
 290   while (0)
 291
 292 /* Add an external function to the list of functions to be declared at
 293    the end of the file.  */
 294 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)                           \
 295   do                                                                    \
 296     {                                                                   \
 297       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 298         i386_pe_record_external_function (NAME);                        \
 299     }                                                                   \
 300   while (0)
 301
 302 /* Declare the type properly for any external libcall.  */
 303 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
 304   i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1)
 305
 306 /* This says out to put a global symbol in the BSS section.  */
 307 #undef ASM_OUTPUT_ALIGNED_BSS
 308 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 309   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 310
 311 /* Output function declarations at the end of the file.  */
 312 #undef TARGET_ASM_FILE_END
 313 #define TARGET_ASM_FILE_END i386_pe_file_end
 314
 315 #undef ASM_COMMENT_START
 316 #define ASM_COMMENT_START " #"
 317
 318 /* DWARF2 Unwinding doesn't work with exception handling yet.  To make
 319    it work, we need to build a libgcc_s.dll, and dcrt0.o should be
 320    changed to call __register_frame_info/__deregister_frame_info.  */
 321 #define DWARF2_UNWIND_INFO 0
 322
 323 /* Don't assume anything about the header files.  */
 324 #define NO_IMPLICIT_EXTERN_C
 325
 326 #undef PROFILE_HOOK
 327 #define PROFILE_HOOK(LABEL)                                             \
 328   if (MAIN_NAME_P (DECL_NAME (current_function_decl)))                  \
 329     {                                                                   \
 330       emit_call_insn (gen_rtx_CALL (VOIDmode,                           \
 331         gen_rtx_MEM (FUNCTION_MODE,                                     \
 332                      gen_rtx_SYMBOL_REF (Pmode, "_monstartup")),        \
 333         const0_rtx));                                                   \
 334     }
 335
 336 /* Java Native Interface (JNI) methods on Win32 are invoked using the
 337    stdcall calling convention.  */
 338 #undef MODIFY_JNI_METHOD_CALL
 339 #define MODIFY_JNI_METHOD_CALL(MDECL)                                         \
 340   build_type_attribute_variant ((MDECL),                                      \
 341                                build_tree_list (get_identifier ("stdcall"),   \
 342                                                 NULL))
 343
 344 /* External function declarations.  */
 345
 346 extern void i386_pe_record_external_function (const char *);
 347 extern void i386_pe_declare_function_type (FILE *, const char *, int);
 348 extern void i386_pe_record_exported_symbol (const char *, int);
 349 extern void i386_pe_file_end (void);
 350 extern int i386_pe_dllexport_name_p (const char *);
 351 extern int i386_pe_dllimport_name_p (const char *);
 352
 353 /* For Win32 ABI compatibility */
 354 #undef DEFAULT_PCC_STRUCT_RETURN
 355 #define DEFAULT_PCC_STRUCT_RETURN 0
 356
 357 /* MSVC returns aggregate types of up to 8 bytes via registers.
 358    See i386.c:ix86_return_in_memory.  */
 359 #undef MS_AGGREGATE_RETURN
 360 #define MS_AGGREGATE_RETURN 1
 361
 362 /* No data type wants to be aligned rounder than this.  */
 363 #undef  BIGGEST_ALIGNMENT
 364 #define BIGGEST_ALIGNMENT 128
 365
 366 /* Native complier aligns internal doubles in structures on dword boundaries.  */
 367 #undef  BIGGEST_FIELD_ALIGNMENT
 368 #define BIGGEST_FIELD_ALIGNMENT 64
 369
 370 /* A bit-field declared as `int' forces `int' alignment for the struct.  */
 371 #undef PCC_BITFIELD_TYPE_MATTERS
 372 #define PCC_BITFIELD_TYPE_MATTERS 1
 373 #define GROUP_BITFIELDS_BY_ALIGN TYPE_NATIVE(rec)
 374
 375 /* Enable alias attribute support.  */
 376 #ifndef SET_ASM_OP
 377 #define SET_ASM_OP "\t.set\t"
 378 #endif
 379 /* This implements the `alias' attribute, keeping any stdcall or
 380    fastcall decoration.  */
 381 #undef  ASM_OUTPUT_DEF_FROM_DECLS
 382 #define ASM_OUTPUT_DEF_FROM_DECLS(STREAM, DECL, TARGET)                 \
 383   do                                                                    \
 384     {                                                                   \
 385       const char *alias;                                                \
 386       rtx rtlname = XEXP (DECL_RTL (DECL), 0);                          \
 387       if (GET_CODE (rtlname) == SYMBOL_REF)                             \
 388         alias = XSTR (rtlname, 0);                                      \
 389       else                                                              \
 390         abort ();                                                       \
 391       if (TREE_CODE (DECL) == FUNCTION_DECL)                            \
 392         i386_pe_declare_function_type (STREAM, alias,                   \
 393                                        TREE_PUBLIC (DECL));             \
 394       ASM_OUTPUT_DEF (STREAM, alias, IDENTIFIER_POINTER (TARGET));      \
 395     } while (0)
 396
 397 /* Decide whether it is safe to use a local alias for a virtual function
 398    when constructing thunks.  */
 399 #undef TARGET_USE_LOCAL_THUNK_ALIAS_P
 400 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) (!DECL_ONE_ONLY (DECL))
 401
 402 #undef TREE
 403
 404 #ifndef BUFSIZ
 405 # undef FILE
 406 #endif