void PrintBacktrace(PCONTEXT context)
{
HANDLE hProcess = GetCurrentProcess();
HANDLE hThread = GetCurrentThread();
char appDir[MAX_PATH + 1];
GetModuleFileName(nullptr, appDir, sizeof(appDir));
char* end = strrchr(appDir, PATH_SEPARATOR);
if (end) *end = '\0';
SymSetOptions(SymGetOptions() | SYMOPT_LOAD_LINES | SYMOPT_FAIL_CRITICAL_ERRORS);
if (!SymInitialize(hProcess, appDir, TRUE))
{
warn("Could not obtain detailed exception information: SymInitialize failed");
return;
}
const int MAX_NAMELEN = 1024;
IMAGEHLP_SYMBOL64* sym = (IMAGEHLP_SYMBOL64 *) malloc(sizeof(IMAGEHLP_SYMBOL64) + MAX_NAMELEN);
memset(sym, 0, sizeof(IMAGEHLP_SYMBOL64) + MAX_NAMELEN);
sym->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
sym->MaxNameLength = MAX_NAMELEN;
IMAGEHLP_LINE64 ilLine;
memset(&ilLine, 0, sizeof(ilLine));
ilLine.SizeOfStruct = sizeof(ilLine);
STACKFRAME64 sfStackFrame;
memset(&sfStackFrame, 0, sizeof(sfStackFrame));
DWORD imageType;
#ifdef _M_IX86
imageType = IMAGE_FILE_MACHINE_I386;
sfStackFrame.AddrPC.Offset = context->Eip;
sfStackFrame.AddrPC.Mode = AddrModeFlat;
sfStackFrame.AddrFrame.Offset = context->Ebp;
sfStackFrame.AddrFrame.Mode = AddrModeFlat;
sfStackFrame.AddrStack.Offset = context->Esp;
sfStackFrame.AddrStack.Mode = AddrModeFlat;
#elif _M_X64
imageType = IMAGE_FILE_MACHINE_AMD64;
sfStackFrame.AddrPC.Offset = context->Rip;
sfStackFrame.AddrPC.Mode = AddrModeFlat;
sfStackFrame.AddrFrame.Offset = context->Rsp;
sfStackFrame.AddrFrame.Mode = AddrModeFlat;
sfStackFrame.AddrStack.Offset = context->Rsp;
sfStackFrame.AddrStack.Mode = AddrModeFlat;
#else
warn("Could not obtain detailed exception information: platform not supported");
return;
#endif
for (int frameNum = 0; ; frameNum++)
{
if (frameNum > 1000)
{
warn("Endless stack, abort tracing");
return;
}
if (!StackWalk64(imageType, hProcess, hThread, &sfStackFrame, context, nullptr, SymFunctionTableAccess64, SymGetModuleBase64, nullptr))
{
warn("Could not obtain detailed exception information: StackWalk64 failed");
return;
}
DWORD64 dwAddr = sfStackFrame.AddrPC.Offset;
BString<1024> symName;
BString<1024> srcFileName;
int lineNumber = 0;
DWORD64 dwSymbolDisplacement;
if (SymGetSymFromAddr64(hProcess, dwAddr, &dwSymbolDisplacement, sym))
{
UnDecorateSymbolName(sym->Name, symName, symName.Capacity(), UNDNAME_COMPLETE);
symName[sizeof(symName) - 1] = '\0';
}
else
{
symName = "<symbol not available>";
}
DWORD dwLineDisplacement;
if (SymGetLineFromAddr64(hProcess, dwAddr, &dwLineDisplacement, &ilLine))
{
lineNumber = ilLine.LineNumber;
char* useFileName = ilLine.FileName;
char* root = strstr(useFileName, "\\daemon\\");
if (root)
{
useFileName = root;
}
srcFileName = useFileName;
}
else
{
srcFileName = "<filename not available>";
}
info("%s (%i) : %s", *srcFileName, lineNumber, *symName);
if (sfStackFrame.AddrReturn.Offset == 0)
{
break;
}
}
}
CString FileSystem::GetLastErrorMessage()
{
BString<1024> msg;
strerror_r(errno, msg, msg.Capacity());
return *msg;
}
