asan_win.cc revision 736cf49a46b3cc5aa1856762f85e6f2799c24e5a 
1//===-- asan_win.cc -------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file is a part of AddressSanitizer, an address sanity checker.
11//
12// Windows-specific details.
13//===----------------------------------------------------------------------===//
14
15#include "sanitizer_common/sanitizer_platform.h"
16#if SANITIZER_WINDOWS
17#include <windows.h>
18
19#include <dbghelp.h>
20#include <stdlib.h>
21
22#include "asan_interceptors.h"
23#include "asan_internal.h"
24#include "asan_thread.h"
25#include "sanitizer_common/sanitizer_libc.h"
26#include "sanitizer_common/sanitizer_mutex.h"
27
28namespace __asan {
29
30// ---------------------- Stacktraces, symbols, etc. ---------------- {{{1
31static BlockingMutex dbghelp_lock(LINKER_INITIALIZED);
32static bool dbghelp_initialized = false;
33#pragma comment(lib, "dbghelp.lib")
34
35// ---------------------- TSD ---------------- {{{1
36static bool tsd_key_inited = false;
37
38static __declspec(thread) void *fake_tsd = 0;
39
40void AsanTSDInit(void (*destructor)(void *tsd)) {
41  // FIXME: we're ignoring the destructor for now.
42  tsd_key_inited = true;
43}
44
45void *AsanTSDGet() {
46  CHECK(tsd_key_inited);
47  return fake_tsd;
48}
49
50void AsanTSDSet(void *tsd) {
51  CHECK(tsd_key_inited);
52  fake_tsd = tsd;
53}
54
55// ---------------------- Various stuff ---------------- {{{1
56void MaybeReexec() {
57  // No need to re-exec on Windows.
58}
59
60void *AsanDoesNotSupportStaticLinkage() {
61#if defined(_DEBUG)
62#error Please build the runtime with a non-debug CRT: /MD or /MT
63#endif
64  return 0;
65}
66
67void SetAlternateSignalStack() {
68  // FIXME: Decide what to do on Windows.
69}
70
71void UnsetAlternateSignalStack() {
72  // FIXME: Decide what to do on Windows.
73}
74
75void InstallSignalHandlers() {
76  // FIXME: Decide what to do on Windows.
77}
78
79void AsanPlatformThreadInit() {
80  // Nothing here for now.
81}
82
83void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
84  UNIMPLEMENTED();
85}
86
87}  // namespace __asan
88
89// ---------------------- Interface ---------------- {{{1
90using namespace __asan;  // NOLINT
91
92extern "C" {
93SANITIZER_INTERFACE_ATTRIBUTE NOINLINE
94bool __asan_symbolize(const void *addr, char *out_buffer, int buffer_size) {
95  BlockingMutexLock lock(&dbghelp_lock);
96  if (!dbghelp_initialized) {
97    SymSetOptions(SYMOPT_DEFERRED_LOADS |
98                  SYMOPT_UNDNAME |
99                  SYMOPT_LOAD_LINES);
100    CHECK(SymInitialize(GetCurrentProcess(), 0, TRUE));
101    // FIXME: We don't call SymCleanup() on exit yet - should we?
102    dbghelp_initialized = true;
103  }
104
105  // See http://msdn.microsoft.com/en-us/library/ms680578(VS.85).aspx
106  char buffer[sizeof(SYMBOL_INFO) + MAX_SYM_NAME * sizeof(CHAR)];
107  PSYMBOL_INFO symbol = (PSYMBOL_INFO)buffer;
108  symbol->SizeOfStruct = sizeof(SYMBOL_INFO);
109  symbol->MaxNameLen = MAX_SYM_NAME;
110  DWORD64 offset = 0;
111  BOOL got_objname = SymFromAddr(GetCurrentProcess(),
112                                 (DWORD64)addr, &offset, symbol);
113  if (!got_objname)
114    return false;
115
116  DWORD  unused;
117  IMAGEHLP_LINE64 info;
118  info.SizeOfStruct = sizeof(IMAGEHLP_LINE64);
119  BOOL got_fileline = SymGetLineFromAddr64(GetCurrentProcess(),
120                                           (DWORD64)addr, &unused, &info);
121  int written = 0;
122  out_buffer[0] = '\0';
123  // FIXME: it might be useful to print out 'obj' or 'obj+offset' info too.
124  if (got_fileline) {
125    written += internal_snprintf(out_buffer + written, buffer_size - written,
126                        " %s %s:%d", symbol->Name,
127                        info.FileName, info.LineNumber);
128  } else {
129    written += internal_snprintf(out_buffer + written, buffer_size - written,
130                        " %s+0x%p", symbol->Name, offset);
131  }
132  return true;
133}
134}  // extern "C"
135
136
137#endif  // _WIN32
138