libsanitizer/sanitizer_common/sanitizer_win.cpp

   1 //===-- sanitizer_win.cpp -------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file is shared between AddressSanitizer and ThreadSanitizer
  10 // run-time libraries and implements windows-specific functions from
  11 // sanitizer_libc.h.
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "sanitizer_platform.h"
  15 #if SANITIZER_WINDOWS
  16
  17 #define WIN32_LEAN_AND_MEAN
  18 #define NOGDI
  19 #include <windows.h>
  20 #include <io.h>
  21 #include <psapi.h>
  22 #include <stdlib.h>
  23
  24 #include "sanitizer_common.h"
  25 #include "sanitizer_file.h"
  26 #include "sanitizer_libc.h"
  27 #include "sanitizer_mutex.h"
  28 #include "sanitizer_placement_new.h"
  29 #include "sanitizer_win_defs.h"
  30
  31 #if defined(PSAPI_VERSION) && PSAPI_VERSION == 1
  32 #pragma comment(lib, "psapi")
  33 #endif
  34 #if SANITIZER_WIN_TRACE
  35 #include <traceloggingprovider.h>
  36 //  Windows trace logging provider init
  37 #pragma comment(lib, "advapi32.lib")
  38 TRACELOGGING_DECLARE_PROVIDER(g_asan_provider);
  39 // GUID must be the same in utils/AddressSanitizerLoggingProvider.wprp
  40 TRACELOGGING_DEFINE_PROVIDER(g_asan_provider, "AddressSanitizerLoggingProvider",
  41                              (0x6c6c766d, 0x3846, 0x4e6a, 0xa4, 0xfb, 0x5b,
  42                               0x53, 0x0b, 0xd0, 0xf3, 0xfa));
  43 #else
  44 #define TraceLoggingUnregister(x)
  45 #endif
  46
  47 // For WaitOnAddress
  48 #  pragma comment(lib, "synchronization.lib")
  49
  50 // A macro to tell the compiler that this part of the code cannot be reached,
  51 // if the compiler supports this feature. Since we're using this in
  52 // code that is called when terminating the process, the expansion of the
  53 // macro should not terminate the process to avoid infinite recursion.
  54 #if defined(__clang__)
  55 # define BUILTIN_UNREACHABLE() __builtin_unreachable()
  56 #elif defined(__GNUC__) && \
  57     (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5))
  58 # define BUILTIN_UNREACHABLE() __builtin_unreachable()
  59 #elif defined(_MSC_VER)
  60 # define BUILTIN_UNREACHABLE() __assume(0)
  61 #else
  62 # define BUILTIN_UNREACHABLE()
  63 #endif
  64
  65 namespace __sanitizer {
  66
  67 #include "sanitizer_syscall_generic.inc"
  68
  69 // --------------------- sanitizer_common.h
  70 uptr GetPageSize() {
  71   SYSTEM_INFO si;
  72   GetSystemInfo(&si);
  73   return si.dwPageSize;
  74 }
  75
  76 uptr GetMmapGranularity() {
  77   SYSTEM_INFO si;
  78   GetSystemInfo(&si);
  79   return si.dwAllocationGranularity;
  80 }
  81
  82 uptr GetMaxUserVirtualAddress() {
  83   SYSTEM_INFO si;
  84   GetSystemInfo(&si);
  85   return (uptr)si.lpMaximumApplicationAddress;
  86 }
  87
  88 uptr GetMaxVirtualAddress() {
  89   return GetMaxUserVirtualAddress();
  90 }
  91
  92 bool FileExists(const char *filename) {
  93   return ::GetFileAttributesA(filename) != INVALID_FILE_ATTRIBUTES;
  94 }
  95
  96 bool DirExists(const char *path) {
  97   auto attr = ::GetFileAttributesA(path);
  98   return (attr != INVALID_FILE_ATTRIBUTES) && (attr & FILE_ATTRIBUTE_DIRECTORY);
  99 }
 100
 101 uptr internal_getpid() {
 102   return GetProcessId(GetCurrentProcess());
 103 }
 104
 105 int internal_dlinfo(void *handle, int request, void *p) {
 106   UNIMPLEMENTED();
 107 }
 108
 109 // In contrast to POSIX, on Windows GetCurrentThreadId()
 110 // returns a system-unique identifier.
 111 tid_t GetTid() {
 112   return GetCurrentThreadId();
 113 }
 114
 115 uptr GetThreadSelf() {
 116   return GetTid();
 117 }
 118
 119 #if !SANITIZER_GO
 120 void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
 121                                 uptr *stack_bottom) {
 122   CHECK(stack_top);
 123   CHECK(stack_bottom);
 124   MEMORY_BASIC_INFORMATION mbi;
 125   CHECK_NE(VirtualQuery(&mbi /* on stack */, &mbi, sizeof(mbi)), 0);
 126   // FIXME: is it possible for the stack to not be a single allocation?
 127   // Are these values what ASan expects to get (reserved, not committed;
 128   // including stack guard page) ?
 129   *stack_top = (uptr)mbi.BaseAddress + mbi.RegionSize;
 130   *stack_bottom = (uptr)mbi.AllocationBase;
 131 }
 132 #endif  // #if !SANITIZER_GO
 133
 134 bool ErrorIsOOM(error_t err) {
 135   // TODO: This should check which `err`s correspond to OOM.
 136   return false;
 137 }
 138
 139 void *MmapOrDie(uptr size, const char *mem_type, bool raw_report) {
 140   void *rv = VirtualAlloc(0, size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
 141   if (rv == 0)
 142     ReportMmapFailureAndDie(size, mem_type, "allocate",
 143                             GetLastError(), raw_report);
 144   return rv;
 145 }
 146
 147 void UnmapOrDie(void *addr, uptr size) {
 148   if (!size || !addr)
 149     return;
 150
 151   MEMORY_BASIC_INFORMATION mbi;
 152   CHECK(VirtualQuery(addr, &mbi, sizeof(mbi)));
 153
 154   // MEM_RELEASE can only be used to unmap whole regions previously mapped with
 155   // VirtualAlloc. So we first try MEM_RELEASE since it is better, and if that
 156   // fails try MEM_DECOMMIT.
 157   if (VirtualFree(addr, 0, MEM_RELEASE) == 0) {
 158     if (VirtualFree(addr, size, MEM_DECOMMIT) == 0) {
 159       Report("ERROR: %s failed to "
 160              "deallocate 0x%zx (%zd) bytes at address %p (error code: %d)\n",
 161              SanitizerToolName, size, size, addr, GetLastError());
 162       CHECK("unable to unmap" && 0);
 163     }
 164   }
 165 }
 166
 167 static void *ReturnNullptrOnOOMOrDie(uptr size, const char *mem_type,
 168                                      const char *mmap_type) {
 169   error_t last_error = GetLastError();
 170   if (last_error == ERROR_NOT_ENOUGH_MEMORY)
 171     return nullptr;
 172   ReportMmapFailureAndDie(size, mem_type, mmap_type, last_error);
 173 }
 174
 175 void *MmapOrDieOnFatalError(uptr size, const char *mem_type) {
 176   void *rv = VirtualAlloc(0, size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
 177   if (rv == 0)
 178     return ReturnNullptrOnOOMOrDie(size, mem_type, "allocate");
 179   return rv;
 180 }
 181
 182 // We want to map a chunk of address space aligned to 'alignment'.
 183 void *MmapAlignedOrDieOnFatalError(uptr size, uptr alignment,
 184                                    const char *mem_type) {
 185   CHECK(IsPowerOfTwo(size));
 186   CHECK(IsPowerOfTwo(alignment));
 187
 188   // Windows will align our allocations to at least 64K.
 189   alignment = Max(alignment, GetMmapGranularity());
 190
 191   uptr mapped_addr =
 192       (uptr)VirtualAlloc(0, size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
 193   if (!mapped_addr)
 194     return ReturnNullptrOnOOMOrDie(size, mem_type, "allocate aligned");
 195
 196   // If we got it right on the first try, return. Otherwise, unmap it and go to
 197   // the slow path.
 198   if (IsAligned(mapped_addr, alignment))
 199     return (void*)mapped_addr;
 200   if (VirtualFree((void *)mapped_addr, 0, MEM_RELEASE) == 0)
 201     ReportMmapFailureAndDie(size, mem_type, "deallocate", GetLastError());
 202
 203   // If we didn't get an aligned address, overallocate, find an aligned address,
 204   // unmap, and try to allocate at that aligned address.
 205   int retries = 0;
 206   const int kMaxRetries = 10;
 207   for (; retries < kMaxRetries &&
 208          (mapped_addr == 0 || !IsAligned(mapped_addr, alignment));
 209        retries++) {
 210     // Overallocate size + alignment bytes.
 211     mapped_addr =
 212         (uptr)VirtualAlloc(0, size + alignment, MEM_RESERVE, PAGE_NOACCESS);
 213     if (!mapped_addr)
 214       return ReturnNullptrOnOOMOrDie(size, mem_type, "allocate aligned");
 215
 216     // Find the aligned address.
 217     uptr aligned_addr = RoundUpTo(mapped_addr, alignment);
 218
 219     // Free the overallocation.
 220     if (VirtualFree((void *)mapped_addr, 0, MEM_RELEASE) == 0)
 221       ReportMmapFailureAndDie(size, mem_type, "deallocate", GetLastError());
 222
 223     // Attempt to allocate exactly the number of bytes we need at the aligned
 224     // address. This may fail for a number of reasons, in which case we continue
 225     // the loop.
 226     mapped_addr = (uptr)VirtualAlloc((void *)aligned_addr, size,
 227                                      MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
 228   }
 229
 230   // Fail if we can't make this work quickly.
 231   if (retries == kMaxRetries && mapped_addr == 0)
 232     return ReturnNullptrOnOOMOrDie(size, mem_type, "allocate aligned");
 233
 234   return (void *)mapped_addr;
 235 }
 236
 237 // ZeroMmapFixedRegion zero's out a region of memory previously returned from a
 238 // call to one of the MmapFixed* helpers. On non-windows systems this would be
 239 // done with another mmap, but on windows remapping is not an option.
 240 // VirtualFree(DECOMMIT)+VirtualAlloc(RECOMMIT) would also be a way to zero the
 241 // memory, but we can't do this atomically, so instead we fall back to using
 242 // internal_memset.
 243 bool ZeroMmapFixedRegion(uptr fixed_addr, uptr size) {
 244   internal_memset((void*) fixed_addr, 0, size);
 245   return true;
 246 }
 247
 248 bool MmapFixedNoReserve(uptr fixed_addr, uptr size, const char *name) {
 249   // FIXME: is this really "NoReserve"? On Win32 this does not matter much,
 250   // but on Win64 it does.
 251   (void)name;  // unsupported
 252 #if !SANITIZER_GO && SANITIZER_WINDOWS64
 253   // On asan/Windows64, use MEM_COMMIT would result in error
 254   // 1455:ERROR_COMMITMENT_LIMIT.
 255   // Asan uses exception handler to commit page on demand.
 256   void *p = VirtualAlloc((LPVOID)fixed_addr, size, MEM_RESERVE, PAGE_READWRITE);
 257 #else
 258   void *p = VirtualAlloc((LPVOID)fixed_addr, size, MEM_RESERVE | MEM_COMMIT,
 259                          PAGE_READWRITE);
 260 #endif
 261   if (p == 0) {
 262     Report("ERROR: %s failed to "
 263            "allocate %p (%zd) bytes at %p (error code: %d)\n",
 264            SanitizerToolName, size, size, fixed_addr, GetLastError());
 265     return false;
 266   }
 267   return true;
 268 }
 269
 270 bool MmapFixedSuperNoReserve(uptr fixed_addr, uptr size, const char *name) {
 271   // FIXME: Windows support large pages too. Might be worth checking
 272   return MmapFixedNoReserve(fixed_addr, size, name);
 273 }
 274
 275 // Memory space mapped by 'MmapFixedOrDie' must have been reserved by
 276 // 'MmapFixedNoAccess'.
 277 void *MmapFixedOrDie(uptr fixed_addr, uptr size, const char *name) {
 278   void *p = VirtualAlloc((LPVOID)fixed_addr, size,
 279       MEM_COMMIT, PAGE_READWRITE);
 280   if (p == 0) {
 281     char mem_type[30];
 282     internal_snprintf(mem_type, sizeof(mem_type), "memory at address 0x%zx",
 283                       fixed_addr);
 284     ReportMmapFailureAndDie(size, mem_type, "allocate", GetLastError());
 285   }
 286   return p;
 287 }
 288
 289 // Uses fixed_addr for now.
 290 // Will use offset instead once we've implemented this function for real.
 291 uptr ReservedAddressRange::Map(uptr fixed_addr, uptr size, const char *name) {
 292   return reinterpret_cast<uptr>(MmapFixedOrDieOnFatalError(fixed_addr, size));
 293 }
 294
 295 uptr ReservedAddressRange::MapOrDie(uptr fixed_addr, uptr size,
 296                                     const char *name) {
 297   return reinterpret_cast<uptr>(MmapFixedOrDie(fixed_addr, size));
 298 }
 299
 300 void ReservedAddressRange::Unmap(uptr addr, uptr size) {
 301   // Only unmap if it covers the entire range.
 302   CHECK((addr == reinterpret_cast<uptr>(base_)) && (size == size_));
 303   // We unmap the whole range, just null out the base.
 304   base_ = nullptr;
 305   size_ = 0;
 306   UnmapOrDie(reinterpret_cast<void*>(addr), size);
 307 }
 308
 309 void *MmapFixedOrDieOnFatalError(uptr fixed_addr, uptr size, const char *name) {
 310   void *p = VirtualAlloc((LPVOID)fixed_addr, size,
 311       MEM_COMMIT, PAGE_READWRITE);
 312   if (p == 0) {
 313     char mem_type[30];
 314     internal_snprintf(mem_type, sizeof(mem_type), "memory at address 0x%zx",
 315                       fixed_addr);
 316     return ReturnNullptrOnOOMOrDie(size, mem_type, "allocate");
 317   }
 318   return p;
 319 }
 320
 321 void *MmapNoReserveOrDie(uptr size, const char *mem_type) {
 322   // FIXME: make this really NoReserve?
 323   return MmapOrDie(size, mem_type);
 324 }
 325
 326 uptr ReservedAddressRange::Init(uptr size, const char *name, uptr fixed_addr) {
 327   base_ = fixed_addr ? MmapFixedNoAccess(fixed_addr, size) : MmapNoAccess(size);
 328   size_ = size;
 329   name_ = name;
 330   (void)os_handle_;  // unsupported
 331   return reinterpret_cast<uptr>(base_);
 332 }
 333
 334
 335 void *MmapFixedNoAccess(uptr fixed_addr, uptr size, const char *name) {
 336   (void)name; // unsupported
 337   void *res = VirtualAlloc((LPVOID)fixed_addr, size,
 338                            MEM_RESERVE, PAGE_NOACCESS);
 339   if (res == 0)
 340     Report("WARNING: %s failed to "
 341            "mprotect %p (%zd) bytes at %p (error code: %d)\n",
 342            SanitizerToolName, size, size, fixed_addr, GetLastError());
 343   return res;
 344 }
 345
 346 void *MmapNoAccess(uptr size) {
 347   void *res = VirtualAlloc(nullptr, size, MEM_RESERVE, PAGE_NOACCESS);
 348   if (res == 0)
 349     Report("WARNING: %s failed to "
 350            "mprotect %p (%zd) bytes (error code: %d)\n",
 351            SanitizerToolName, size, size, GetLastError());
 352   return res;
 353 }
 354
 355 bool MprotectNoAccess(uptr addr, uptr size) {
 356   DWORD old_protection;
 357   return VirtualProtect((LPVOID)addr, size, PAGE_NOACCESS, &old_protection);
 358 }
 359
 360 bool MprotectReadOnly(uptr addr, uptr size) {
 361   DWORD old_protection;
 362   return VirtualProtect((LPVOID)addr, size, PAGE_READONLY, &old_protection);
 363 }
 364
 365 void ReleaseMemoryPagesToOS(uptr beg, uptr end) {
 366   uptr beg_aligned = RoundDownTo(beg, GetPageSizeCached()),
 367        end_aligned = RoundDownTo(end, GetPageSizeCached());
 368   CHECK(beg < end);                // make sure the region is sane
 369   if (beg_aligned == end_aligned)  // make sure we're freeing at least 1 page;
 370     return;
 371   UnmapOrDie((void *)beg, end_aligned - beg_aligned);
 372 }
 373
 374 void SetShadowRegionHugePageMode(uptr addr, uptr size) {
 375   // FIXME: probably similar to ReleaseMemoryToOS.
 376 }
 377
 378 bool DontDumpShadowMemory(uptr addr, uptr length) {
 379   // This is almost useless on 32-bits.
 380   // FIXME: add madvise-analog when we move to 64-bits.
 381   return true;
 382 }
 383
 384 uptr MapDynamicShadow(uptr shadow_size_bytes, uptr shadow_scale,
 385                       uptr min_shadow_base_alignment,
 386                       UNUSED uptr &high_mem_end) {
 387   const uptr granularity = GetMmapGranularity();
 388   const uptr alignment =
 389       Max<uptr>(granularity << shadow_scale, 1ULL << min_shadow_base_alignment);
 390   const uptr left_padding =
 391       Max<uptr>(granularity, 1ULL << min_shadow_base_alignment);
 392   uptr space_size = shadow_size_bytes + left_padding;
 393   uptr shadow_start = FindAvailableMemoryRange(space_size, alignment,
 394                                                granularity, nullptr, nullptr);
 395   CHECK_NE((uptr)0, shadow_start);
 396   CHECK(IsAligned(shadow_start, alignment));
 397   return shadow_start;
 398 }
 399
 400 uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding,
 401                               uptr *largest_gap_found,
 402                               uptr *max_occupied_addr) {
 403   uptr address = 0;
 404   while (true) {
 405     MEMORY_BASIC_INFORMATION info;
 406     if (!::VirtualQuery((void*)address, &info, sizeof(info)))
 407       return 0;
 408
 409     if (info.State == MEM_FREE) {
 410       uptr shadow_address = RoundUpTo((uptr)info.BaseAddress + left_padding,
 411                                       alignment);
 412       if (shadow_address + size < (uptr)info.BaseAddress + info.RegionSize)
 413         return shadow_address;
 414     }
 415
 416     // Move to the next region.
 417     address = (uptr)info.BaseAddress + info.RegionSize;
 418   }
 419   return 0;
 420 }
 421
 422 uptr MapDynamicShadowAndAliases(uptr shadow_size, uptr alias_size,
 423                                 uptr num_aliases, uptr ring_buffer_size) {
 424   CHECK(false && "HWASan aliasing is unimplemented on Windows");
 425   return 0;
 426 }
 427
 428 bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
 429   MEMORY_BASIC_INFORMATION mbi;
 430   CHECK(VirtualQuery((void *)range_start, &mbi, sizeof(mbi)));
 431   return mbi.Protect == PAGE_NOACCESS &&
 432          (uptr)mbi.BaseAddress + mbi.RegionSize >= range_end;
 433 }
 434
 435 void *MapFileToMemory(const char *file_name, uptr *buff_size) {
 436   UNIMPLEMENTED();
 437 }
 438
 439 void *MapWritableFileToMemory(void *addr, uptr size, fd_t fd, OFF_T offset) {
 440   UNIMPLEMENTED();
 441 }
 442
 443 static const int kMaxEnvNameLength = 128;
 444 static const DWORD kMaxEnvValueLength = 32767;
 445
 446 namespace {
 447
 448 struct EnvVariable {
 449   char name[kMaxEnvNameLength];
 450   char value[kMaxEnvValueLength];
 451 };
 452
 453 }  // namespace
 454
 455 static const int kEnvVariables = 5;
 456 static EnvVariable env_vars[kEnvVariables];
 457 static int num_env_vars;
 458
 459 const char *GetEnv(const char *name) {
 460   // Note: this implementation caches the values of the environment variables
 461   // and limits their quantity.
 462   for (int i = 0; i < num_env_vars; i++) {
 463     if (0 == internal_strcmp(name, env_vars[i].name))
 464       return env_vars[i].value;
 465   }
 466   CHECK_LT(num_env_vars, kEnvVariables);
 467   DWORD rv = GetEnvironmentVariableA(name, env_vars[num_env_vars].value,
 468                                      kMaxEnvValueLength);
 469   if (rv > 0 && rv < kMaxEnvValueLength) {
 470     CHECK_LT(internal_strlen(name), kMaxEnvNameLength);
 471     internal_strncpy(env_vars[num_env_vars].name, name, kMaxEnvNameLength);
 472     num_env_vars++;
 473     return env_vars[num_env_vars - 1].value;
 474   }
 475   return 0;
 476 }
 477
 478 const char *GetPwd() {
 479   UNIMPLEMENTED();
 480 }
 481
 482 u32 GetUid() {
 483   UNIMPLEMENTED();
 484 }
 485
 486 namespace {
 487 struct ModuleInfo {
 488   const char *filepath;
 489   uptr base_address;
 490   uptr end_address;
 491 };
 492
 493 #if !SANITIZER_GO
 494 int CompareModulesBase(const void *pl, const void *pr) {
 495   const ModuleInfo *l = (const ModuleInfo *)pl, *r = (const ModuleInfo *)pr;
 496   if (l->base_address < r->base_address)
 497     return -1;
 498   return l->base_address > r->base_address;
 499 }
 500 #endif
 501 }  // namespace
 502
 503 #if !SANITIZER_GO
 504 void DumpProcessMap() {
 505   Report("Dumping process modules:\n");
 506   ListOfModules modules;
 507   modules.init();
 508   uptr num_modules = modules.size();
 509
 510   InternalMmapVector<ModuleInfo> module_infos(num_modules);
 511   for (size_t i = 0; i < num_modules; ++i) {
 512     module_infos[i].filepath = modules[i].full_name();
 513     module_infos[i].base_address = modules[i].ranges().front()->beg;
 514     module_infos[i].end_address = modules[i].ranges().back()->end;
 515   }
 516   qsort(module_infos.data(), num_modules, sizeof(ModuleInfo),
 517         CompareModulesBase);
 518
 519   for (size_t i = 0; i < num_modules; ++i) {
 520     const ModuleInfo &mi = module_infos[i];
 521     if (mi.end_address != 0) {
 522       Printf("\t%p-%p %s\n", mi.base_address, mi.end_address,
 523              mi.filepath[0] ? mi.filepath : "[no name]");
 524     } else if (mi.filepath[0]) {
 525       Printf("\t??\?-??? %s\n", mi.filepath);
 526     } else {
 527       Printf("\t???\n");
 528     }
 529   }
 530 }
 531 #endif
 532
 533 void DisableCoreDumperIfNecessary() {
 534   // Do nothing.
 535 }
 536
 537 void ReExec() {
 538   UNIMPLEMENTED();
 539 }
 540
 541 void PlatformPrepareForSandboxing(void *args) {}
 542
 543 bool StackSizeIsUnlimited() {
 544   UNIMPLEMENTED();
 545 }
 546
 547 void SetStackSizeLimitInBytes(uptr limit) {
 548   UNIMPLEMENTED();
 549 }
 550
 551 bool AddressSpaceIsUnlimited() {
 552   UNIMPLEMENTED();
 553 }
 554
 555 void SetAddressSpaceUnlimited() {
 556   UNIMPLEMENTED();
 557 }
 558
 559 bool IsPathSeparator(const char c) {
 560   return c == '\\' || c == '/';
 561 }
 562
 563 static bool IsAlpha(char c) {
 564   c = ToLower(c);
 565   return c >= 'a' && c <= 'z';
 566 }
 567
 568 bool IsAbsolutePath(const char *path) {
 569   return path != nullptr && IsAlpha(path[0]) && path[1] == ':' &&
 570          IsPathSeparator(path[2]);
 571 }
 572
 573 void internal_usleep(u64 useconds) { Sleep(useconds / 1000); }
 574
 575 u64 NanoTime() {
 576   static LARGE_INTEGER frequency = {};
 577   LARGE_INTEGER counter;
 578   if (UNLIKELY(frequency.QuadPart == 0)) {
 579     QueryPerformanceFrequency(&frequency);
 580     CHECK_NE(frequency.QuadPart, 0);
 581   }
 582   QueryPerformanceCounter(&counter);
 583   counter.QuadPart *= 1000ULL * 1000000ULL;
 584   counter.QuadPart /= frequency.QuadPart;
 585   return counter.QuadPart;
 586 }
 587
 588 u64 MonotonicNanoTime() { return NanoTime(); }
 589
 590 void Abort() {
 591   internal__exit(3);
 592 }
 593
 594 bool CreateDir(const char *pathname) {
 595   return CreateDirectoryA(pathname, nullptr) != 0;
 596 }
 597
 598 #if !SANITIZER_GO
 599 // Read the file to extract the ImageBase field from the PE header. If ASLR is
 600 // disabled and this virtual address is available, the loader will typically
 601 // load the image at this address. Therefore, we call it the preferred base. Any
 602 // addresses in the DWARF typically assume that the object has been loaded at
 603 // this address.
 604 static uptr GetPreferredBase(const char *modname, char *buf, size_t buf_size) {
 605   fd_t fd = OpenFile(modname, RdOnly, nullptr);
 606   if (fd == kInvalidFd)
 607     return 0;
 608   FileCloser closer(fd);
 609
 610   // Read just the DOS header.
 611   IMAGE_DOS_HEADER dos_header;
 612   uptr bytes_read;
 613   if (!ReadFromFile(fd, &dos_header, sizeof(dos_header), &bytes_read) ||
 614       bytes_read != sizeof(dos_header))
 615     return 0;
 616
 617   // The file should start with the right signature.
 618   if (dos_header.e_magic != IMAGE_DOS_SIGNATURE)
 619     return 0;
 620
 621   // The layout at e_lfanew is:
 622   // "PE\0\0"
 623   // IMAGE_FILE_HEADER
 624   // IMAGE_OPTIONAL_HEADER
 625   // Seek to e_lfanew and read all that data.
 626   if (::SetFilePointer(fd, dos_header.e_lfanew, nullptr, FILE_BEGIN) ==
 627       INVALID_SET_FILE_POINTER)
 628     return 0;
 629   if (!ReadFromFile(fd, buf, buf_size, &bytes_read) || bytes_read != buf_size)
 630     return 0;
 631
 632   // Check for "PE\0\0" before the PE header.
 633   char *pe_sig = &buf[0];
 634   if (internal_memcmp(pe_sig, "PE\0\0", 4) != 0)
 635     return 0;
 636
 637   // Skip over IMAGE_FILE_HEADER. We could do more validation here if we wanted.
 638   IMAGE_OPTIONAL_HEADER *pe_header =
 639       (IMAGE_OPTIONAL_HEADER *)(pe_sig + 4 + sizeof(IMAGE_FILE_HEADER));
 640
 641   // Check for more magic in the PE header.
 642   if (pe_header->Magic != IMAGE_NT_OPTIONAL_HDR_MAGIC)
 643     return 0;
 644
 645   // Finally, return the ImageBase.
 646   return (uptr)pe_header->ImageBase;
 647 }
 648
 649 void ListOfModules::init() {
 650   clearOrInit();
 651   HANDLE cur_process = GetCurrentProcess();
 652
 653   // Query the list of modules.  Start by assuming there are no more than 256
 654   // modules and retry if that's not sufficient.
 655   HMODULE *hmodules = 0;
 656   uptr modules_buffer_size = sizeof(HMODULE) * 256;
 657   DWORD bytes_required;
 658   while (!hmodules) {
 659     hmodules = (HMODULE *)MmapOrDie(modules_buffer_size, __FUNCTION__);
 660     CHECK(EnumProcessModules(cur_process, hmodules, modules_buffer_size,
 661                              &bytes_required));
 662     if (bytes_required > modules_buffer_size) {
 663       // Either there turned out to be more than 256 hmodules, or new hmodules
 664       // could have loaded since the last try.  Retry.
 665       UnmapOrDie(hmodules, modules_buffer_size);
 666       hmodules = 0;
 667       modules_buffer_size = bytes_required;
 668     }
 669   }
 670
 671   InternalMmapVector<char> buf(4 + sizeof(IMAGE_FILE_HEADER) +
 672                                sizeof(IMAGE_OPTIONAL_HEADER));
 673   InternalMmapVector<wchar_t> modname_utf16(kMaxPathLength);
 674   InternalMmapVector<char> module_name(kMaxPathLength);
 675   // |num_modules| is the number of modules actually present,
 676   size_t num_modules = bytes_required / sizeof(HMODULE);
 677   for (size_t i = 0; i < num_modules; ++i) {
 678     HMODULE handle = hmodules[i];
 679     MODULEINFO mi;
 680     if (!GetModuleInformation(cur_process, handle, &mi, sizeof(mi)))
 681       continue;
 682
 683     // Get the UTF-16 path and convert to UTF-8.
 684     int modname_utf16_len =
 685         GetModuleFileNameW(handle, &modname_utf16[0], kMaxPathLength);
 686     if (modname_utf16_len == 0)
 687       modname_utf16[0] = '\0';
 688     int module_name_len = ::WideCharToMultiByte(
 689         CP_UTF8, 0, &modname_utf16[0], modname_utf16_len + 1, &module_name[0],
 690         kMaxPathLength, NULL, NULL);
 691     module_name[module_name_len] = '\0';
 692
 693     uptr base_address = (uptr)mi.lpBaseOfDll;
 694     uptr end_address = (uptr)mi.lpBaseOfDll + mi.SizeOfImage;
 695
 696     // Adjust the base address of the module so that we get a VA instead of an
 697     // RVA when computing the module offset. This helps llvm-symbolizer find the
 698     // right DWARF CU. In the common case that the image is loaded at it's
 699     // preferred address, we will now print normal virtual addresses.
 700     uptr preferred_base =
 701         GetPreferredBase(&module_name[0], &buf[0], buf.size());
 702     uptr adjusted_base = base_address - preferred_base;
 703
 704     modules_.push_back(LoadedModule());
 705     LoadedModule &cur_module = modules_.back();
 706     cur_module.set(&module_name[0], adjusted_base);
 707     // We add the whole module as one single address range.
 708     cur_module.addAddressRange(base_address, end_address, /*executable*/ true,
 709                                /*writable*/ true);
 710   }
 711   UnmapOrDie(hmodules, modules_buffer_size);
 712 }
 713
 714 void ListOfModules::fallbackInit() { clear(); }
 715
 716 // We can't use atexit() directly at __asan_init time as the CRT is not fully
 717 // initialized at this point.  Place the functions into a vector and use
 718 // atexit() as soon as it is ready for use (i.e. after .CRT$XIC initializers).
 719 InternalMmapVectorNoCtor<void (*)(void)> atexit_functions;
 720
 721 int Atexit(void (*function)(void)) {
 722   atexit_functions.push_back(function);
 723   return 0;
 724 }
 725
 726 static int RunAtexit() {
 727   TraceLoggingUnregister(g_asan_provider);
 728   int ret = 0;
 729   for (uptr i = 0; i < atexit_functions.size(); ++i) {
 730     ret |= atexit(atexit_functions[i]);
 731   }
 732   return ret;
 733 }
 734
 735 #pragma section(".CRT$XID", long, read)
 736 __declspec(allocate(".CRT$XID")) int (*__run_atexit)() = RunAtexit;
 737 #endif
 738
 739 // ------------------ sanitizer_libc.h
 740 fd_t OpenFile(const char *filename, FileAccessMode mode, error_t *last_error) {
 741   // FIXME: Use the wide variants to handle Unicode filenames.
 742   fd_t res;
 743   if (mode == RdOnly) {
 744     res = CreateFileA(filename, GENERIC_READ,
 745                       FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
 746                       nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
 747   } else if (mode == WrOnly) {
 748     res = CreateFileA(filename, GENERIC_WRITE, 0, nullptr, CREATE_ALWAYS,
 749                       FILE_ATTRIBUTE_NORMAL, nullptr);
 750   } else {
 751     UNIMPLEMENTED();
 752   }
 753   CHECK(res != kStdoutFd || kStdoutFd == kInvalidFd);
 754   CHECK(res != kStderrFd || kStderrFd == kInvalidFd);
 755   if (res == kInvalidFd && last_error)
 756     *last_error = GetLastError();
 757   return res;
 758 }
 759
 760 void CloseFile(fd_t fd) {
 761   CloseHandle(fd);
 762 }
 763
 764 bool ReadFromFile(fd_t fd, void *buff, uptr buff_size, uptr *bytes_read,
 765                   error_t *error_p) {
 766   CHECK(fd != kInvalidFd);
 767
 768   // bytes_read can't be passed directly to ReadFile:
 769   // uptr is unsigned long long on 64-bit Windows.
 770   unsigned long num_read_long;
 771
 772   bool success = ::ReadFile(fd, buff, buff_size, &num_read_long, nullptr);
 773   if (!success && error_p)
 774     *error_p = GetLastError();
 775   if (bytes_read)
 776     *bytes_read = num_read_long;
 777   return success;
 778 }
 779
 780 bool SupportsColoredOutput(fd_t fd) {
 781   // FIXME: support colored output.
 782   return false;
 783 }
 784
 785 bool WriteToFile(fd_t fd, const void *buff, uptr buff_size, uptr *bytes_written,
 786                  error_t *error_p) {
 787   CHECK(fd != kInvalidFd);
 788
 789   // Handle null optional parameters.
 790   error_t dummy_error;
 791   error_p = error_p ? error_p : &dummy_error;
 792   uptr dummy_bytes_written;
 793   bytes_written = bytes_written ? bytes_written : &dummy_bytes_written;
 794
 795   // Initialize output parameters in case we fail.
 796   *error_p = 0;
 797   *bytes_written = 0;
 798
 799   // Map the conventional Unix fds 1 and 2 to Windows handles. They might be
 800   // closed, in which case this will fail.
 801   if (fd == kStdoutFd || fd == kStderrFd) {
 802     fd = GetStdHandle(fd == kStdoutFd ? STD_OUTPUT_HANDLE : STD_ERROR_HANDLE);
 803     if (fd == 0) {
 804       *error_p = ERROR_INVALID_HANDLE;
 805       return false;
 806     }
 807   }
 808
 809   DWORD bytes_written_32;
 810   if (!WriteFile(fd, buff, buff_size, &bytes_written_32, 0)) {
 811     *error_p = GetLastError();
 812     return false;
 813   } else {
 814     *bytes_written = bytes_written_32;
 815     return true;
 816   }
 817 }
 818
 819 uptr internal_sched_yield() {
 820   Sleep(0);
 821   return 0;
 822 }
 823
 824 void internal__exit(int exitcode) {
 825   TraceLoggingUnregister(g_asan_provider);
 826   // ExitProcess runs some finalizers, so use TerminateProcess to avoid that.
 827   // The debugger doesn't stop on TerminateProcess like it does on ExitProcess,
 828   // so add our own breakpoint here.
 829   if (::IsDebuggerPresent())
 830     __debugbreak();
 831   TerminateProcess(GetCurrentProcess(), exitcode);
 832   BUILTIN_UNREACHABLE();
 833 }
 834
 835 uptr internal_ftruncate(fd_t fd, uptr size) {
 836   UNIMPLEMENTED();
 837 }
 838
 839 uptr GetRSS() {
 840   PROCESS_MEMORY_COUNTERS counters;
 841   if (!GetProcessMemoryInfo(GetCurrentProcess(), &counters, sizeof(counters)))
 842     return 0;
 843   return counters.WorkingSetSize;
 844 }
 845
 846 void *internal_start_thread(void *(*func)(void *arg), void *arg) { return 0; }
 847 void internal_join_thread(void *th) { }
 848
 849 void FutexWait(atomic_uint32_t *p, u32 cmp) {
 850   WaitOnAddress(p, &cmp, sizeof(cmp), INFINITE);
 851 }
 852
 853 void FutexWake(atomic_uint32_t *p, u32 count) {
 854   if (count == 1)
 855     WakeByAddressSingle(p);
 856   else
 857     WakeByAddressAll(p);
 858 }
 859
 860 uptr GetTlsSize() {
 861   return 0;
 862 }
 863
 864 void InitTlsSize() {
 865 }
 866
 867 void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size,
 868                           uptr *tls_addr, uptr *tls_size) {
 869 #if SANITIZER_GO
 870   *stk_addr = 0;
 871   *stk_size = 0;
 872   *tls_addr = 0;
 873   *tls_size = 0;
 874 #else
 875   uptr stack_top, stack_bottom;
 876   GetThreadStackTopAndBottom(main, &stack_top, &stack_bottom);
 877   *stk_addr = stack_bottom;
 878   *stk_size = stack_top - stack_bottom;
 879   *tls_addr = 0;
 880   *tls_size = 0;
 881 #endif
 882 }
 883
 884 void ReportFile::Write(const char *buffer, uptr length) {
 885   SpinMutexLock l(mu);
 886   ReopenIfNecessary();
 887   if (!WriteToFile(fd, buffer, length)) {
 888     // stderr may be closed, but we may be able to print to the debugger
 889     // instead.  This is the case when launching a program from Visual Studio,
 890     // and the following routine should write to its console.
 891     OutputDebugStringA(buffer);
 892   }
 893 }
 894
 895 void SetAlternateSignalStack() {
 896   // FIXME: Decide what to do on Windows.
 897 }
 898
 899 void UnsetAlternateSignalStack() {
 900   // FIXME: Decide what to do on Windows.
 901 }
 902
 903 void InstallDeadlySignalHandlers(SignalHandlerType handler) {
 904   (void)handler;
 905   // FIXME: Decide what to do on Windows.
 906 }
 907
 908 HandleSignalMode GetHandleSignalMode(int signum) {
 909   // FIXME: Decide what to do on Windows.
 910   return kHandleSignalNo;
 911 }
 912
 913 // Check based on flags if we should handle this exception.
 914 bool IsHandledDeadlyException(DWORD exceptionCode) {
 915   switch (exceptionCode) {
 916     case EXCEPTION_ACCESS_VIOLATION:
 917     case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
 918     case EXCEPTION_STACK_OVERFLOW:
 919     case EXCEPTION_DATATYPE_MISALIGNMENT:
 920     case EXCEPTION_IN_PAGE_ERROR:
 921       return common_flags()->handle_segv;
 922     case EXCEPTION_ILLEGAL_INSTRUCTION:
 923     case EXCEPTION_PRIV_INSTRUCTION:
 924     case EXCEPTION_BREAKPOINT:
 925       return common_flags()->handle_sigill;
 926     case EXCEPTION_FLT_DENORMAL_OPERAND:
 927     case EXCEPTION_FLT_DIVIDE_BY_ZERO:
 928     case EXCEPTION_FLT_INEXACT_RESULT:
 929     case EXCEPTION_FLT_INVALID_OPERATION:
 930     case EXCEPTION_FLT_OVERFLOW:
 931     case EXCEPTION_FLT_STACK_CHECK:
 932     case EXCEPTION_FLT_UNDERFLOW:
 933     case EXCEPTION_INT_DIVIDE_BY_ZERO:
 934     case EXCEPTION_INT_OVERFLOW:
 935       return common_flags()->handle_sigfpe;
 936   }
 937   return false;
 938 }
 939
 940 bool IsAccessibleMemoryRange(uptr beg, uptr size) {
 941   SYSTEM_INFO si;
 942   GetNativeSystemInfo(&si);
 943   uptr page_size = si.dwPageSize;
 944   uptr page_mask = ~(page_size - 1);
 945
 946   for (uptr page = beg & page_mask, end = (beg + size - 1) & page_mask;
 947        page <= end;) {
 948     MEMORY_BASIC_INFORMATION info;
 949     if (VirtualQuery((LPCVOID)page, &info, sizeof(info)) != sizeof(info))
 950       return false;
 951
 952     if (info.Protect == 0 || info.Protect == PAGE_NOACCESS ||
 953         info.Protect == PAGE_EXECUTE)
 954       return false;
 955
 956     if (info.RegionSize == 0)
 957       return false;
 958
 959     page += info.RegionSize;
 960   }
 961
 962   return true;
 963 }
 964
 965 bool SignalContext::IsStackOverflow() const {
 966   return (DWORD)GetType() == EXCEPTION_STACK_OVERFLOW;
 967 }
 968
 969 void SignalContext::InitPcSpBp() {
 970   EXCEPTION_RECORD *exception_record = (EXCEPTION_RECORD *)siginfo;
 971   CONTEXT *context_record = (CONTEXT *)context;
 972
 973   pc = (uptr)exception_record->ExceptionAddress;
 974 #  if SANITIZER_WINDOWS64
 975 #    if SANITIZER_ARM64
 976   bp = (uptr)context_record->Fp;
 977   sp = (uptr)context_record->Sp;
 978 #    else
 979   bp = (uptr)context_record->Rbp;
 980   sp = (uptr)context_record->Rsp;
 981 #    endif
 982 #  else
 983   bp = (uptr)context_record->Ebp;
 984   sp = (uptr)context_record->Esp;
 985 #  endif
 986 }
 987
 988 uptr SignalContext::GetAddress() const {
 989   EXCEPTION_RECORD *exception_record = (EXCEPTION_RECORD *)siginfo;
 990   if (exception_record->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
 991     return exception_record->ExceptionInformation[1];
 992   return (uptr)exception_record->ExceptionAddress;
 993 }
 994
 995 bool SignalContext::IsMemoryAccess() const {
 996   return ((EXCEPTION_RECORD *)siginfo)->ExceptionCode ==
 997          EXCEPTION_ACCESS_VIOLATION;
 998 }
 999
1000 bool SignalContext::IsTrueFaultingAddress() const { return true; }
1001
1002 SignalContext::WriteFlag SignalContext::GetWriteFlag() const {
1003   EXCEPTION_RECORD *exception_record = (EXCEPTION_RECORD *)siginfo;
1004
1005   // The write flag is only available for access violation exceptions.
1006   if (exception_record->ExceptionCode != EXCEPTION_ACCESS_VIOLATION)
1007     return SignalContext::Unknown;
1008
1009   // The contents of this array are documented at
1010   // https://docs.microsoft.com/en-us/windows/win32/api/winnt/ns-winnt-exception_record
1011   // The first element indicates read as 0, write as 1, or execute as 8.  The
1012   // second element is the faulting address.
1013   switch (exception_record->ExceptionInformation[0]) {
1014     case 0:
1015       return SignalContext::Read;
1016     case 1:
1017       return SignalContext::Write;
1018     case 8:
1019       return SignalContext::Unknown;
1020   }
1021   return SignalContext::Unknown;
1022 }
1023
1024 void SignalContext::DumpAllRegisters(void *context) {
1025   // FIXME: Implement this.
1026 }
1027
1028 int SignalContext::GetType() const {
1029   return static_cast<const EXCEPTION_RECORD *>(siginfo)->ExceptionCode;
1030 }
1031
1032 const char *SignalContext::Describe() const {
1033   unsigned code = GetType();
1034   // Get the string description of the exception if this is a known deadly
1035   // exception.
1036   switch (code) {
1037     case EXCEPTION_ACCESS_VIOLATION:
1038       return "access-violation";
1039     case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
1040       return "array-bounds-exceeded";
1041     case EXCEPTION_STACK_OVERFLOW:
1042       return "stack-overflow";
1043     case EXCEPTION_DATATYPE_MISALIGNMENT:
1044       return "datatype-misalignment";
1045     case EXCEPTION_IN_PAGE_ERROR:
1046       return "in-page-error";
1047     case EXCEPTION_ILLEGAL_INSTRUCTION:
1048       return "illegal-instruction";
1049     case EXCEPTION_PRIV_INSTRUCTION:
1050       return "priv-instruction";
1051     case EXCEPTION_BREAKPOINT:
1052       return "breakpoint";
1053     case EXCEPTION_FLT_DENORMAL_OPERAND:
1054       return "flt-denormal-operand";
1055     case EXCEPTION_FLT_DIVIDE_BY_ZERO:
1056       return "flt-divide-by-zero";
1057     case EXCEPTION_FLT_INEXACT_RESULT:
1058       return "flt-inexact-result";
1059     case EXCEPTION_FLT_INVALID_OPERATION:
1060       return "flt-invalid-operation";
1061     case EXCEPTION_FLT_OVERFLOW:
1062       return "flt-overflow";
1063     case EXCEPTION_FLT_STACK_CHECK:
1064       return "flt-stack-check";
1065     case EXCEPTION_FLT_UNDERFLOW:
1066       return "flt-underflow";
1067     case EXCEPTION_INT_DIVIDE_BY_ZERO:
1068       return "int-divide-by-zero";
1069     case EXCEPTION_INT_OVERFLOW:
1070       return "int-overflow";
1071   }
1072   return "unknown exception";
1073 }
1074
1075 uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) {
1076   if (buf_len == 0)
1077     return 0;
1078
1079   // Get the UTF-16 path and convert to UTF-8.
1080   InternalMmapVector<wchar_t> binname_utf16(kMaxPathLength);
1081   int binname_utf16_len =
1082       GetModuleFileNameW(NULL, &binname_utf16[0], kMaxPathLength);
1083   if (binname_utf16_len == 0) {
1084     buf[0] = '\0';
1085     return 0;
1086   }
1087   int binary_name_len =
1088       ::WideCharToMultiByte(CP_UTF8, 0, &binname_utf16[0], binname_utf16_len,
1089                             buf, buf_len, NULL, NULL);
1090   if ((unsigned)binary_name_len == buf_len)
1091     --binary_name_len;
1092   buf[binary_name_len] = '\0';
1093   return binary_name_len;
1094 }
1095
1096 uptr ReadLongProcessName(/*out*/char *buf, uptr buf_len) {
1097   return ReadBinaryName(buf, buf_len);
1098 }
1099
1100 void CheckVMASize() {
1101   // Do nothing.
1102 }
1103
1104 void InitializePlatformEarly() {
1105   // Do nothing.
1106 }
1107
1108 void CheckASLR() {
1109   // Do nothing
1110 }
1111
1112 void CheckMPROTECT() {
1113   // Do nothing
1114 }
1115
1116 char **GetArgv() {
1117   // FIXME: Actually implement this function.
1118   return 0;
1119 }
1120
1121 char **GetEnviron() {
1122   // FIXME: Actually implement this function.
1123   return 0;
1124 }
1125
1126 pid_t StartSubprocess(const char *program, const char *const argv[],
1127                       const char *const envp[], fd_t stdin_fd, fd_t stdout_fd,
1128                       fd_t stderr_fd) {
1129   // FIXME: implement on this platform
1130   // Should be implemented based on
1131   // SymbolizerProcess::StarAtSymbolizerSubprocess
1132   // from lib/sanitizer_common/sanitizer_symbolizer_win.cpp.
1133   return -1;
1134 }
1135
1136 bool IsProcessRunning(pid_t pid) {
1137   // FIXME: implement on this platform.
1138   return false;
1139 }
1140
1141 int WaitForProcess(pid_t pid) { return -1; }
1142
1143 // FIXME implement on this platform.
1144 void GetMemoryProfile(fill_profile_f cb, uptr *stats) {}
1145
1146 void CheckNoDeepBind(const char *filename, int flag) {
1147   // Do nothing.
1148 }
1149
1150 // FIXME: implement on this platform.
1151 bool GetRandom(void *buffer, uptr length, bool blocking) {
1152   UNIMPLEMENTED();
1153 }
1154
1155 u32 GetNumberOfCPUs() {
1156   SYSTEM_INFO sysinfo = {};
1157   GetNativeSystemInfo(&sysinfo);
1158   return sysinfo.dwNumberOfProcessors;
1159 }
1160
1161 #if SANITIZER_WIN_TRACE
1162 // TODO(mcgov): Rename this project-wide to PlatformLogInit
1163 void AndroidLogInit(void) {
1164   HRESULT hr = TraceLoggingRegister(g_asan_provider);
1165   if (!SUCCEEDED(hr))
1166     return;
1167 }
1168
1169 void SetAbortMessage(const char *) {}
1170
1171 void LogFullErrorReport(const char *buffer) {
1172   if (common_flags()->log_to_syslog) {
1173     InternalMmapVector<wchar_t> filename;
1174     DWORD filename_length = 0;
1175     do {
1176       filename.resize(filename.size() + 0x100);
1177       filename_length =
1178           GetModuleFileNameW(NULL, filename.begin(), filename.size());
1179     } while (filename_length >= filename.size());
1180     TraceLoggingWrite(g_asan_provider, "AsanReportEvent",
1181                       TraceLoggingValue(filename.begin(), "ExecutableName"),
1182                       TraceLoggingValue(buffer, "AsanReportContents"));
1183   }
1184 }
1185 #endif // SANITIZER_WIN_TRACE
1186
1187 void InitializePlatformCommonFlags(CommonFlags *cf) {}
1188
1189 }  // namespace __sanitizer
1190
1191 #endif  // _WIN32