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) 1995-2021 Free Software Foundation, Inc. 4 5 This file is part of GCC. 6 7 GCC 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 3, or (at your option) 10 any later version. 11 12 GCC 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 GCC; see the file COPYING3. If not see 19 <http://www.gnu.org/licenses/>. */ 20 21 #define DWARF2_DEBUGGING_INFO 1 22 23 #undef PREFERRED_DEBUGGING_TYPE 24 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG 25 26 #undef TARGET_SEH 27 #define TARGET_SEH (TARGET_64BIT_MS_ABI && flag_unwind_tables) 28 29 /* Win64 with SEH cannot represent DRAP stack frames. Disable its use. 30 Force the use of different mechanisms to allocate aligned local data. */ 31 #undef MAX_STACK_ALIGNMENT 32 #define MAX_STACK_ALIGNMENT (TARGET_SEH ? 128 : MAX_OFILE_ALIGNMENT) 33 34 /* 32-bit Windows aligns the stack on a 4-byte boundary but SSE instructions 35 may require 16-byte alignment. */ 36 #undef STACK_REALIGN_DEFAULT 37 #define STACK_REALIGN_DEFAULT TARGET_SSE 38 39 /* Support hooks for SEH. */ 40 #undef TARGET_ASM_UNWIND_EMIT 41 #define TARGET_ASM_UNWIND_EMIT i386_pe_seh_unwind_emit 42 #undef TARGET_ASM_UNWIND_EMIT_BEFORE_INSN 43 #define TARGET_ASM_UNWIND_EMIT_BEFORE_INSN false 44 #undef TARGET_ASM_FUNCTION_END_PROLOGUE 45 #define TARGET_ASM_FUNCTION_END_PROLOGUE i386_pe_seh_end_prologue 46 #undef TARGET_ASM_EMIT_EXCEPT_PERSONALITY 47 #define TARGET_ASM_EMIT_EXCEPT_PERSONALITY i386_pe_seh_emit_except_personality 48 #undef TARGET_ASM_INIT_SECTIONS 49 #define TARGET_ASM_INIT_SECTIONS i386_pe_seh_init_sections 50 #define SUBTARGET_ASM_UNWIND_INIT i386_pe_seh_init 51 52 #undef DEFAULT_ABI 53 #define DEFAULT_ABI (TARGET_64BIT ? MS_ABI : SYSV_ABI) 54 55 #undef TARGET_PECOFF 56 #define TARGET_PECOFF 1 57 58 #if ! defined (USE_MINGW64_LEADING_UNDERSCORES) 59 #undef USER_LABEL_PREFIX 60 #define USER_LABEL_PREFIX (TARGET_64BIT ? "" : "_") 61 62 #undef LOCAL_LABEL_PREFIX 63 #define LOCAL_LABEL_PREFIX (TARGET_64BIT ? "." : "") 64 65 #undef ASM_GENERATE_INTERNAL_LABEL 66 #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER) \ 67 sprintf ((BUF), "*%s%s%ld", LOCAL_LABEL_PREFIX, \ 68 (PREFIX), (long)(NUMBER)) 69 70 #undef LPREFIX 71 #define LPREFIX (TARGET_64BIT ? ".L" : "L") 72 73 #endif 74 75 #undef DBX_REGISTER_NUMBER 76 #define DBX_REGISTER_NUMBER(n) \ 77 (TARGET_64BIT ? dbx64_register_map[n] \ 78 : (dwarf_debuginfo_p () \ 79 ? svr4_dbx_register_map[n] : dbx_register_map[n])) 80 81 /* Map gcc register number to DWARF 2 CFA column number. For 32 bit 82 target, always use the svr4_dbx_register_map for DWARF .eh_frame 83 even if we don't use DWARF .debug_frame. */ 84 #undef DWARF_FRAME_REGNUM 85 #define DWARF_FRAME_REGNUM(n) \ 86 (TARGET_64BIT ? dbx64_register_map[(n)] \ 87 : svr4_dbx_register_map[(n)]) 88 89 /* The 64-bit MS_ABI changes the set of call-used registers. */ 90 #undef DWARF_FRAME_REGISTERS 91 #define DWARF_FRAME_REGISTERS (TARGET_64BIT ? 33 : 17) 92 93 /* Use section relative relocations for debugging offsets. Unlike 94 other targets that fake this by putting the section VMA at 0, PE 95 won't allow it. */ 96 #define ASM_OUTPUT_DWARF_OFFSET(FILE, SIZE, LABEL, OFFSET, SECTION) \ 97 do { \ 98 switch (SIZE) \ 99 { \ 100 case 4: \ 101 fputs ("\t.secrel32\t", FILE); \ 102 assemble_name (FILE, LABEL); \ 103 if ((OFFSET) != 0) \ 104 fprintf (FILE, "+" HOST_WIDE_INT_PRINT_DEC, \ 105 (HOST_WIDE_INT) (OFFSET)); \ 106 break; \ 107 case 8: \ 108 /* This is a hack. There is no 64-bit section relative \ 109 relocation. However, the COFF format also does not \ 110 support 64-bit file offsets; 64-bit applications are \ 111 limited to 32-bits of code+data in any one module. \ 112 Fake the 64-bit offset by zero-extending it. */ \ 113 fputs ("\t.secrel32\t", FILE); \ 114 assemble_name (FILE, LABEL); \ 115 if ((OFFSET) != 0) \ 116 fprintf (FILE, "+" HOST_WIDE_INT_PRINT_DEC, \ 117 (HOST_WIDE_INT) (OFFSET)); \ 118 fputs ("\n\t.long\t0", FILE); \ 119 break; \ 120 default: \ 121 gcc_unreachable (); \ 122 } \ 123 } while (0) 124 125 #define TARGET_EXECUTABLE_SUFFIX ".exe" 126 127 #define TARGET_OS_CPP_BUILTINS() \ 128 do \ 129 { \ 130 if (!TARGET_64BIT) \ 131 builtin_define ("_X86_=1"); \ 132 if (TARGET_SEH) \ 133 builtin_define ("__SEH__"); \ 134 builtin_assert ("system=winnt"); \ 135 builtin_define ("__stdcall=__attribute__((__stdcall__))"); \ 136 builtin_define ("__fastcall=__attribute__((__fastcall__))"); \ 137 builtin_define ("__thiscall=__attribute__((__thiscall__))"); \ 138 builtin_define ("__cdecl=__attribute__((__cdecl__))"); \ 139 if (!flag_iso) \ 140 { \ 141 builtin_define ("_stdcall=__attribute__((__stdcall__))"); \ 142 builtin_define ("_fastcall=__attribute__((__fastcall__))"); \ 143 builtin_define ("_thiscall=__attribute__((__thiscall__))"); \ 144 builtin_define ("_cdecl=__attribute__((__cdecl__))"); \ 145 } \ 146 /* Even though linkonce works with static libs, this is needed \ 147 to compare typeinfo symbols across dll boundaries. */ \ 148 builtin_define ("__GXX_MERGED_TYPEINFO_NAMES=0"); \ 149 builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0"); \ 150 EXTRA_OS_CPP_BUILTINS (); \ 151 } \ 152 while (0) 153 154 /* Get tree.c to declare a target-specific specialization of 155 merge_decl_attributes. */ 156 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1 157 158 /* This macro defines names of additional specifications to put in the specs 159 that can be used in various specifications like CC1_SPEC. Its definition 160 is an initializer with a subgrouping for each command option. 161 162 Each subgrouping contains a string constant, that defines the 163 specification name, and a string constant that used by the GCC driver 164 program. 165 166 Do not define this macro if it does not need to do anything. */ 167 168 #undef SUBTARGET_EXTRA_SPECS 169 #define SUBTARGET_EXTRA_SPECS \ 170 { "mingw_include_path", DEFAULT_TARGET_MACHINE } 171 172 #undef MATH_LIBRARY 173 #define MATH_LIBRARY "" 174 175 #undef TARGET_LIBC_HAS_FUNCTION 176 #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function 177 178 #define SIZE_TYPE (TARGET_64BIT ? "long long unsigned int" : "unsigned int") 179 #define PTRDIFF_TYPE (TARGET_64BIT ? "long long int" : "int") 180 181 #define WCHAR_TYPE_SIZE 16 182 #define WCHAR_TYPE "short unsigned int" 183 184 /* Windows64 continues to use a 32-bit long type. */ 185 #undef LONG_TYPE_SIZE 186 #define LONG_TYPE_SIZE 32 187 188 #define drectve_section() \ 189 (fprintf (asm_out_file, "\t.section .drectve\n"), \ 190 in_section = NULL) 191 192 /* Older versions of gas don't handle 'r' as data. 193 Explicitly set data flag with 'd'. */ 194 #define READONLY_DATA_SECTION_ASM_OP "\t.section .rdata,\"dr\"" 195 196 /* Don't allow flag_pic to propagate since gas may produce invalid code 197 otherwise. */ 198 199 #undef SUBTARGET_OVERRIDE_OPTIONS 200 #define SUBTARGET_OVERRIDE_OPTIONS \ 201 do { \ 202 flag_pic = TARGET_64BIT ? 1 : 0; \ 203 } while (0) 204 205 /* Define this macro if references to a symbol must be treated 206 differently depending on something about the variable or 207 function named by the symbol (such as what section it is in). 208 209 On i386 running Windows NT, modify the assembler name with a suffix 210 consisting of an atsign (@) followed by string of digits that represents 211 the number of bytes of arguments passed to the function, if it has the 212 attribute STDCALL. 213 214 In addition, we must mark dll symbols specially. Definitions of 215 dllexport'd objects install some info in the .drectve section. 216 References to dllimport'd objects are fetched indirectly via 217 _imp__. If both are declared, dllexport overrides. This is also 218 needed to implement one-only vtables: they go into their own 219 section and we need to set DECL_SECTION_NAME so we do that here. 220 Note that we can be called twice on the same decl. */ 221 222 #define SUBTARGET_ENCODE_SECTION_INFO i386_pe_encode_section_info 223 224 /* Local and global relocs can be placed always into readonly memory 225 for PE-COFF targets. */ 226 #undef TARGET_ASM_RELOC_RW_MASK 227 #define TARGET_ASM_RELOC_RW_MASK i386_pe_reloc_rw_mask 228 229 /* Output a common block. */ 230 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON 231 #define ASM_OUTPUT_ALIGNED_DECL_COMMON \ 232 i386_pe_asm_output_aligned_decl_common 233 234 /* Output the label for an initialized variable. */ 235 #undef ASM_DECLARE_OBJECT_NAME 236 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL) \ 237 do { \ 238 i386_pe_maybe_record_exported_symbol (DECL, NAME, 1); \ 239 ASM_OUTPUT_LABEL ((STREAM), (NAME)); \ 240 } while (0) 241 242 /* Output a reference to a label. Fastcall function symbols 243 keep their '@' prefix, while other symbols are prefixed 244 with user_label_prefix. */ 245 #undef ASM_OUTPUT_LABELREF 246 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \ 247 do { \ 248 if ((NAME)[0] != FASTCALL_PREFIX) \ 249 fputs (user_label_prefix, (STREAM)); \ 250 fputs ((NAME), (STREAM)); \ 251 } while (0) 252 253 /* This does much the same in memory rather than to a stream. */ 254 #undef TARGET_MANGLE_ASSEMBLER_NAME 255 #define TARGET_MANGLE_ASSEMBLER_NAME i386_pe_mangle_assembler_name 256 257 258 /* Emit code to check the stack when allocating more than 4000 259 bytes in one go. */ 260 #define CHECK_STACK_LIMIT 4000 261 262 /* By default, target has a 80387, uses IEEE compatible arithmetic, 263 returns float values in the 387 and needs stack probes. 264 We also align doubles to 64-bits for MSVC default compatibility. */ 265 266 #undef TARGET_SUBTARGET_DEFAULT 267 #define TARGET_SUBTARGET_DEFAULT \ 268 (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS \ 269 | MASK_STACK_PROBE | MASK_ALIGN_DOUBLE) 270 271 #undef TARGET_SUBTARGET64_DEFAULT 272 #define TARGET_SUBTARGET64_DEFAULT \ 273 MASK_128BIT_LONG_DOUBLE 274 275 /* This is how to output an assembler line 276 that says to advance the location counter 277 to a multiple of 2**LOG bytes. */ 278 279 #undef ASM_OUTPUT_ALIGN 280 #define ASM_OUTPUT_ALIGN(FILE,LOG) \ 281 if ((LOG) != 0) fprintf ((FILE), "\t.align %d\n", 1 << (LOG)) 282 283 /* Windows uses explicit import from shared libraries. */ 284 #define MULTIPLE_SYMBOL_SPACES 1 285 286 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section 287 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section 288 289 #define SUPPORTS_ONE_ONLY 1 290 291 /* Switch into a generic section. */ 292 #define TARGET_ASM_NAMED_SECTION i386_pe_asm_named_section 293 294 /* Select attributes for named sections. */ 295 #define TARGET_SECTION_TYPE_FLAGS i386_pe_section_type_flags 296 297 /* Write the extra assembler code needed to declare a function 298 properly. */ 299 #undef ASM_DECLARE_FUNCTION_NAME 300 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ 301 i386_pe_start_function (FILE, NAME, DECL) 302 303 /* Write the extra assembler code needed to declare the name of a 304 cold function partition properly. */ 305 306 #undef ASM_DECLARE_COLD_FUNCTION_NAME 307 #define ASM_DECLARE_COLD_FUNCTION_NAME(FILE, NAME, DECL) \ 308 do \ 309 { \ 310 i386_pe_declare_function_type (FILE, NAME, 0); \ 311 i386_pe_seh_cold_init (FILE, NAME); \ 312 ASM_OUTPUT_LABEL (FILE, NAME); \ 313 } \ 314 while (0) 315 316 #undef ASM_DECLARE_FUNCTION_SIZE 317 #define ASM_DECLARE_FUNCTION_SIZE(FILE,NAME,DECL) \ 318 i386_pe_end_function (FILE, NAME, DECL) 319 320 #undef ASM_DECLARE_COLD_FUNCTION_SIZE 321 #define ASM_DECLARE_COLD_FUNCTION_SIZE(FILE,NAME,DECL) \ 322 i386_pe_end_cold_function (FILE, NAME, DECL) 323 324 /* Add an external function to the list of functions to be declared at 325 the end of the file. */ 326 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \ 327 do \ 328 { \ 329 if (TREE_CODE (DECL) == FUNCTION_DECL) \ 330 i386_pe_record_external_function ((DECL), (NAME)); \ 331 } \ 332 while (0) 333 334 /* Declare the type properly for any external libcall. */ 335 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \ 336 i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1) 337 338 /* This says out to put a global symbol in the BSS section. */ 339 #undef ASM_OUTPUT_ALIGNED_BSS 340 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ 341 asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN)) 342 343 /* Output function declarations at the end of the file. */ 344 #undef TARGET_ASM_FILE_END 345 #define TARGET_ASM_FILE_END i386_pe_file_end 346 347 /* Kludge because of missing PE-COFF support for early LTO debug. */ 348 #undef TARGET_ASM_LTO_START 349 #define TARGET_ASM_LTO_START i386_pe_asm_lto_start 350 #undef TARGET_ASM_LTO_END 351 #define TARGET_ASM_LTO_END i386_pe_asm_lto_end 352 353 #undef ASM_COMMENT_START 354 #define ASM_COMMENT_START " #" 355 356 #ifndef DWARF2_UNWIND_INFO 357 /* If configured with --disable-sjlj-exceptions, use DWARF2 for 32-bit 358 mode else default to SJLJ. 64-bit code uses SEH unless you request 359 SJLJ. */ 360 #if (defined (CONFIG_SJLJ_EXCEPTIONS) && !CONFIG_SJLJ_EXCEPTIONS) 361 /* The logic of this #if must be kept synchronised with the logic 362 for selecting the tmake_eh_file fragment in libgcc/config.host. */ 363 #define DWARF2_UNWIND_INFO 1 364 #else 365 #define DWARF2_UNWIND_INFO 0 366 #endif 367 #endif 368 369 #undef PROFILE_HOOK 370 #define PROFILE_HOOK(LABEL) \ 371 if (MAIN_NAME_P (DECL_NAME (current_function_decl))) \ 372 { \ 373 emit_call_insn (gen_rtx_CALL (VOIDmode, \ 374 gen_rtx_MEM (FUNCTION_MODE, \ 375 gen_rtx_SYMBOL_REF (Pmode, "_monstartup")), \ 376 const0_rtx)); \ 377 } 378 379 /* For Win32 ABI compatibility */ 380 #undef DEFAULT_PCC_STRUCT_RETURN 381 #define DEFAULT_PCC_STRUCT_RETURN 0 382 383 /* MSVC returns aggregate types of up to 8 bytes via registers. 384 See i386.c:ix86_return_in_memory. */ 385 #undef MS_AGGREGATE_RETURN 386 #define MS_AGGREGATE_RETURN 1 387 388 /* Biggest alignment supported by the object file format of this 389 machine. Use this macro to limit the alignment which can be 390 specified using the `__attribute__ ((aligned (N)))' construct. If 391 not defined, the default value is `BIGGEST_ALIGNMENT'. */ 392 /* IMAGE_SCN_ALIGN_8192BYTES is the largest section alignment flag 393 specified in the PECOFF60 spec. Native MS compiler also limits 394 user-specified alignment to 8192 bytes. */ 395 #undef MAX_OFILE_ALIGNMENT 396 #define MAX_OFILE_ALIGNMENT (8192 * 8) 397 398 /* BIGGEST_FIELD_ALIGNMENT macro is used directly by libobjc, There, we 399 align internal doubles in structures on dword boundaries. Otherwise, 400 support vector modes using ADJUST_FIELD_ALIGN, defined in i386.h. */ 401 #ifdef IN_TARGET_LIBS 402 #undef BIGGEST_FIELD_ALIGNMENT 403 #define BIGGEST_FIELD_ALIGNMENT 64 404 #endif 405 406 /* Enable alias attribute support. */ 407 #ifndef SET_ASM_OP 408 #define SET_ASM_OP "\t.set\t" 409 #endif 410 411 /* This implements the `alias' attribute, keeping any stdcall or 412 fastcall decoration. */ 413 #undef ASM_OUTPUT_DEF_FROM_DECLS 414 #define ASM_OUTPUT_DEF_FROM_DECLS(STREAM, DECL, TARGET) \ 415 do \ 416 { \ 417 const char *alias \ 418 = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \ 419 i386_pe_maybe_record_exported_symbol (DECL, alias, 0); \ 420 if (TREE_CODE (DECL) == FUNCTION_DECL) \ 421 i386_pe_declare_function_type (STREAM, alias, \ 422 TREE_PUBLIC (DECL)); \ 423 ASM_OUTPUT_DEF (STREAM, alias, IDENTIFIER_POINTER (TARGET)); \ 424 } while (0) 425 426 /* GNU as supports weak symbols on PECOFF. */ 427 #ifdef HAVE_GAS_WEAK 428 #define ASM_WEAKEN_LABEL(FILE, NAME) \ 429 do \ 430 { \ 431 fputs ("\t.weak\t", (FILE)); \ 432 assemble_name ((FILE), (NAME)); \ 433 fputc ('\n', (FILE)); \ 434 } \ 435 while (0) 436 437 #endif /* HAVE_GAS_WEAK */ 438 439 /* Decide whether it is safe to use a local alias for a virtual function 440 when constructing thunks. */ 441 #undef TARGET_USE_LOCAL_THUNK_ALIAS_P 442 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) (!DECL_ONE_ONLY (DECL)) 443 444 #define SUBTARGET_ATTRIBUTE_TABLE \ 445 { "selectany", 0, 0, true, false, false, false, \ 446 ix86_handle_selectany_attribute, NULL } 447 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, 448 affects_type_identity, handler, exclude } */ 449 450 /* mcount() does not need a counter variable. */ 451 #undef NO_PROFILE_COUNTERS 452 #define NO_PROFILE_COUNTERS 1 453 454 #define TARGET_VALID_DLLIMPORT_ATTRIBUTE_P i386_pe_valid_dllimport_attribute_p 455 #define TARGET_CXX_ADJUST_CLASS_AT_DEFINITION i386_pe_adjust_class_at_definition 456 #define SUBTARGET_MANGLE_DECL_ASSEMBLER_NAME i386_pe_mangle_decl_assembler_name 457 458 #undef TARGET_ASM_ASSEMBLE_VISIBILITY 459 #define TARGET_ASM_ASSEMBLE_VISIBILITY i386_pe_assemble_visibility 460 461 #undef SUB_TARGET_RECORD_STUB 462 #define SUB_TARGET_RECORD_STUB i386_pe_record_stub 463 464 /* Static stack checking is supported by means of probes. */ 465 #define STACK_CHECK_STATIC_BUILTIN 1 466 467 #ifndef HAVE_GAS_ALIGNED_COMM 468 # define HAVE_GAS_ALIGNED_COMM 0 469 #endif 470