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gecko-dev/xpcom/base/nsStackFrameWin.cpp

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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is nsStackFrameWin.h code, released
* December 20, 2003.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2003
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Michael Judge, 20-December-2000
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nscore.h"
#include "windows.h"
#include "stdio.h"
#include "nsStackFrameWin.h"
// Define these as static pointers so that we can load the DLL on the
// fly (and not introduce a link-time dependency on it). Tip o' the
// hat to Matt Pietrick for this idea. See:
//
// http://msdn.microsoft.com/library/periodic/period97/F1/D3/S245C6.htm
//
PR_BEGIN_EXTERN_C
SYMSETOPTIONSPROC _SymSetOptions;
SYMINITIALIZEPROC _SymInitialize;
SYMCLEANUPPROC _SymCleanup;
STACKWALKPROC _StackWalk;
#ifdef USING_WXP_VERSION
STACKWALKPROC64 _StackWalk64;
#else
#define _StackWalk64 0
#endif
SYMFUNCTIONTABLEACCESSPROC _SymFunctionTableAccess;
#ifdef USING_WXP_VERSION
SYMFUNCTIONTABLEACCESSPROC64 _SymFunctionTableAccess64;
#else
#define _SymFunctionTableAccess64 0
#endif
SYMGETMODULEBASEPROC _SymGetModuleBase;
#ifdef USING_WXP_VERSION
SYMGETMODULEBASEPROC64 _SymGetModuleBase64;
#else
#define _SymGetModuleBase64 0
#endif
SYMGETSYMFROMADDRPROC _SymGetSymFromAddr;
#ifdef USING_WXP_VERSION
SYMFROMADDRPROC _SymFromAddr;
#else
#define _SymFromAddr 0
#endif
SYMLOADMODULE _SymLoadModule;
#ifdef USING_WXP_VERSION
SYMLOADMODULE64 _SymLoadModule64;
#else
#define _SymLoadModule64 0
#endif
SYMUNDNAME _SymUnDName;
SYMGETMODULEINFO _SymGetModuleInfo;
#ifdef USING_WXP_VERSION
SYMGETMODULEINFO64 _SymGetModuleInfo64;
#else
#define _SymGetModuleInfo64 0
#endif
ENUMLOADEDMODULES _EnumerateLoadedModules;
#ifdef USING_WXP_VERSION
ENUMLOADEDMODULES64 _EnumerateLoadedModules64;
#else
#define _EnumerateLoadedModules64 0
#endif
SYMGETLINEFROMADDRPROC _SymGetLineFromAddr;
#ifdef USING_WXP_VERSION
SYMGETLINEFROMADDRPROC64 _SymGetLineFromAddr64;
#else
#define _SymGetLineFromAddr64 0
#endif
HANDLE hStackWalkMutex;
PR_END_EXTERN_C
// Routine to print an error message to standard error.
// Will also print to an additional stream if one is supplied.
void PrintError(char *prefix, FILE *out)
{
LPVOID lpMsgBuf;
DWORD lastErr = GetLastError();
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
lastErr,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
0,
NULL
);
fprintf(stderr, "### ERROR: %s: %s", prefix, lpMsgBuf);
if (out)
fprintf(out, "### ERROR: %s: %s\n", prefix, lpMsgBuf);
LocalFree( lpMsgBuf );
}
PRBool
EnsureImageHlpInitialized()
{
static PRBool gInitialized = PR_FALSE;
if (gInitialized)
return gInitialized;
// Create a mutex with no initial owner.
hStackWalkMutex = CreateMutex(
NULL, // default security attributes
FALSE, // initially not owned
NULL); // unnamed mutex
if (hStackWalkMutex == NULL) {
PrintError("CreateMutex", NULL);
return PR_FALSE;
}
HMODULE module = ::LoadLibrary("DBGHELP.DLL");
if (!module) {
module = ::LoadLibrary("IMAGEHLP.DLL");
if (!module) return PR_FALSE;
}
_SymSetOptions = (SYMSETOPTIONSPROC) ::GetProcAddress(module, "SymSetOptions");
if (!_SymSetOptions) return PR_FALSE;
_SymInitialize = (SYMINITIALIZEPROC) ::GetProcAddress(module, "SymInitialize");
if (!_SymInitialize) return PR_FALSE;
_SymCleanup = (SYMCLEANUPPROC)GetProcAddress(module, "SymCleanup");
if (!_SymCleanup) return PR_FALSE;
#ifdef USING_WXP_VERSION
_StackWalk64 = (STACKWALKPROC64)GetProcAddress(module, "StackWalk64");
#endif
_StackWalk = (STACKWALKPROC)GetProcAddress(module, "StackWalk");
if (!_StackWalk64 && !_StackWalk) return PR_FALSE;
#ifdef USING_WXP_VERSION
_SymFunctionTableAccess64 = (SYMFUNCTIONTABLEACCESSPROC64) GetProcAddress(module, "SymFunctionTableAccess64");
#endif
_SymFunctionTableAccess = (SYMFUNCTIONTABLEACCESSPROC) GetProcAddress(module, "SymFunctionTableAccess");
if (!_SymFunctionTableAccess64 && !_SymFunctionTableAccess) return PR_FALSE;
#ifdef USING_WXP_VERSION
_SymGetModuleBase64 = (SYMGETMODULEBASEPROC64)GetProcAddress(module, "SymGetModuleBase64");
#endif
_SymGetModuleBase = (SYMGETMODULEBASEPROC)GetProcAddress(module, "SymGetModuleBase");
if (!_SymGetModuleBase64 && !_SymGetModuleBase) return PR_FALSE;
_SymGetSymFromAddr = (SYMGETSYMFROMADDRPROC)GetProcAddress(module, "SymGetSymFromAddr");
#ifdef USING_WXP_VERSION
_SymFromAddr = (SYMFROMADDRPROC)GetProcAddress(module, "SymFromAddr");
#endif
if (!_SymFromAddr && !_SymGetSymFromAddr) return PR_FALSE;
#ifdef USING_WXP_VERSION
_SymLoadModule64 = (SYMLOADMODULE64)GetProcAddress(module, "SymLoadModule64");
#endif
_SymLoadModule = (SYMLOADMODULE)GetProcAddress(module, "SymLoadModule");
if (!_SymLoadModule64 && !_SymLoadModule) return PR_FALSE;
_SymUnDName = (SYMUNDNAME)GetProcAddress(module, "SymUnDName");
if (!_SymUnDName) return PR_FALSE;
#ifdef USING_WXP_VERSION
_SymGetModuleInfo64 = (SYMGETMODULEINFO64)GetProcAddress(module, "SymGetModuleInfo64");
#endif
_SymGetModuleInfo = (SYMGETMODULEINFO)GetProcAddress(module, "SymGetModuleInfo");
if (!_SymGetModuleInfo64 && !_SymGetModuleInfo) return PR_FALSE;
#ifdef USING_WXP_VERSION
_EnumerateLoadedModules64 = (ENUMLOADEDMODULES64)GetProcAddress(module, "EnumerateLoadedModules64");
#endif
_EnumerateLoadedModules = (ENUMLOADEDMODULES)GetProcAddress(module, "EnumerateLoadedModules");
if (!_EnumerateLoadedModules64 && !_EnumerateLoadedModules) return PR_FALSE;
#ifdef USING_WXP_VERSION
_SymGetLineFromAddr64 = (SYMGETLINEFROMADDRPROC64)GetProcAddress(module, "SymGetLineFromAddr64");
#endif
_SymGetLineFromAddr = (SYMGETLINEFROMADDRPROC)GetProcAddress(module, "SymGetLineFromAddr");
if (!_SymGetLineFromAddr64 && !_SymGetLineFromAddr) return PR_FALSE;
return gInitialized = PR_TRUE;
}
static BOOL CALLBACK callbackEspecial(
LPSTR aModuleName,
DWORD aModuleBase,
ULONG aModuleSize,
PVOID aUserContext)
{
BOOL retval = TRUE;
DWORD addr = *(DWORD*)aUserContext;
/*
* You'll want to control this if we are running on an
* architecture where the addresses go the other direction.
* Not sure this is even a realistic consideration.
*/
const BOOL addressIncreases = TRUE;
/*
* If it falls inside the known range, load the symbols.
*/
if (addressIncreases
? (addr >= aModuleBase && addr <= (aModuleBase + aModuleSize))
: (addr <= aModuleBase && addr >= (aModuleBase - aModuleSize))
) {
retval = _SymLoadModule(GetCurrentProcess(), NULL, aModuleName, NULL, aModuleBase, aModuleSize);
}
return retval;
}
static BOOL CALLBACK callbackEspecial64(
PTSTR aModuleName,
DWORD64 aModuleBase,
ULONG aModuleSize,
PVOID aUserContext)
{
#ifdef USING_WXP_VERSION
BOOL retval = TRUE;
DWORD64 addr = *(DWORD64*)aUserContext;
/*
* You'll want to control this if we are running on an
* architecture where the addresses go the other direction.
* Not sure this is even a realistic consideration.
*/
const BOOL addressIncreases = TRUE;
/*
* If it falls in side the known range, load the symbols.
*/
if (addressIncreases
? (addr >= aModuleBase && addr <= (aModuleBase + aModuleSize))
: (addr <= aModuleBase && addr >= (aModuleBase - aModuleSize))
) {
retval = _SymLoadModule64(GetCurrentProcess(), NULL, aModuleName, NULL, aModuleBase, aModuleSize);
}
return retval;
#else
return FALSE;
#endif
}
/*
* SymGetModuleInfoEspecial
*
* Attempt to determine the module information.
* Bug 112196 says this DLL may not have been loaded at the time
* SymInitialize was called, and thus the module information
* and symbol information is not available.
* This code rectifies that problem.
*/
BOOL SymGetModuleInfoEspecial(HANDLE aProcess, DWORD aAddr, PIMAGEHLP_MODULE aModuleInfo, PIMAGEHLP_LINE aLineInfo)
{
BOOL retval = FALSE;
/*
* Init the vars if we have em.
*/
aModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE);
if (nsnull != aLineInfo) {
aLineInfo->SizeOfStruct = sizeof(IMAGEHLP_LINE);
}
/*
* Give it a go.
* It may already be loaded.
*/
retval = _SymGetModuleInfo(aProcess, aAddr, aModuleInfo);
if (FALSE == retval) {
BOOL enumRes = FALSE;
/*
* Not loaded, here's the magic.
* Go through all the modules.
*/
enumRes = _EnumerateLoadedModules(aProcess, callbackEspecial, (PVOID)&aAddr);
if (FALSE != enumRes)
{
/*
* One final go.
* If it fails, then well, we have other problems.
*/
retval = _SymGetModuleInfo(aProcess, aAddr, aModuleInfo);
}
}
/*
* If we got module info, we may attempt line info as well.
* We will not report failure if this does not work.
*/
if (FALSE != retval && nsnull != aLineInfo && nsnull != _SymGetLineFromAddr) {
DWORD displacement = 0;
BOOL lineRes = FALSE;
lineRes = _SymGetLineFromAddr(aProcess, aAddr, &displacement, aLineInfo);
}
return retval;
}
#ifdef USING_WXP_VERSION
BOOL SymGetModuleInfoEspecial64(HANDLE aProcess, DWORD64 aAddr, PIMAGEHLP_MODULE64 aModuleInfo, PIMAGEHLP_LINE64 aLineInfo)
{
BOOL retval = FALSE;
/*
* Init the vars if we have em.
*/
aModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64);
if (nsnull != aLineInfo) {
aLineInfo->SizeOfStruct = sizeof(IMAGEHLP_LINE64);
}
/*
* Give it a go.
* It may already be loaded.
*/
retval = _SymGetModuleInfo64(aProcess, aAddr, aModuleInfo);
if (FALSE == retval) {
BOOL enumRes = FALSE;
/*
* Not loaded, here's the magic.
* Go through all the modules.
*/
enumRes = _EnumerateLoadedModules64(aProcess, callbackEspecial64, (PVOID)&aAddr);
if (FALSE != enumRes)
{
/*
* One final go.
* If it fails, then well, we have other problems.
*/
retval = _SymGetModuleInfo64(aProcess, aAddr, aModuleInfo);
}
}
/*
* If we got module info, we may attempt line info as well.
* We will not report failure if this does not work.
*/
if (FALSE != retval && nsnull != aLineInfo && nsnull != _SymGetLineFromAddr64) {
DWORD displacement = 0;
BOOL lineRes = FALSE;
lineRes = _SymGetLineFromAddr64(aProcess, aAddr, &displacement, aLineInfo);
}
return retval;
}
#endif
HANDLE
GetCurrentPIDorHandle()
{
if (_SymGetModuleBase64)
return GetCurrentProcess(); // winxp and friends use process handle
return (HANDLE) GetCurrentProcessId(); // winme win98 win95 etc use process identifier
}
PRBool
EnsureSymInitialized()
{
static PRBool gInitialized = PR_FALSE;
PRBool retStat;
if (gInitialized)
return gInitialized;
if (!EnsureImageHlpInitialized())
return PR_FALSE;
_SymSetOptions(SYMOPT_LOAD_LINES | SYMOPT_UNDNAME);
retStat = _SymInitialize(GetCurrentPIDorHandle(), NULL, TRUE);
if (!retStat)
PrintError("SymInitialize", NULL);
gInitialized = retStat;
/* XXX At some point we need to arrange to call _SymCleanup */
return retStat;
}
/**
* Walk the stack, translating PC's found into strings and recording the
* chain in aBuffer. For this to work properly, the DLLs must be rebased
* so that the address in the file agrees with the address in memory.
* Otherwise StackWalk will return FALSE when it hits a frame in a DLL
* whose in memory address doesn't match its in-file address.
*/
void
DumpStackToFile(FILE* aStream)
{
HANDLE myProcess = ::GetCurrentProcess();
HANDLE myThread, walkerThread;
DWORD walkerReturn;
struct DumpStackToFileData data;
if (!EnsureSymInitialized())
return;
// Have to duplicate handle to get a real handle.
::DuplicateHandle(
::GetCurrentProcess(),
::GetCurrentThread(),
::GetCurrentProcess(),
&myThread,
THREAD_ALL_ACCESS, FALSE, 0
);
data.stream = aStream;
data.thread = myThread;
data.process = myProcess;
walkerThread = ::CreateThread( NULL, 0, DumpStackToFileThread, (LPVOID) &data, 0, NULL ) ;
if (walkerThread) {
walkerReturn = ::WaitForSingleObject(walkerThread, 2000); // no timeout is never a good idea
if (walkerReturn != WAIT_OBJECT_0) {
PrintError("ThreadWait", aStream);
}
CloseHandle(myThread);
}
else {
PrintError("ThreadCreate", aStream);
}
return;
}
DWORD WINAPI
DumpStackToFileThread(LPVOID lpdata)
{
struct DumpStackToFileData *data = (DumpStackToFileData *)lpdata;
DWORD ret ;
// Suspend the calling thread, dump his stack, and then resume him.
// He's currently waiting for us to finish so now should be a good time.
ret = ::SuspendThread( data->thread );
if (ret == -1) {
PrintError("ThreadSuspend", data->stream);
}
else {
if (_StackWalk64)
DumpStackToFileMain64(data);
else
DumpStackToFileMain(data);
ret = ::ResumeThread(data->thread);
if (ret == -1) {
PrintError("ThreadResume", data->stream);
}
}
return 0;
}
void
DumpStackToFileMain64(struct DumpStackToFileData* data)
{
#ifdef USING_WXP_VERSION
// Get the context information for the thread. That way we will
// know where our sp, fp, pc, etc. are and can fill in the
// STACKFRAME64 with the initial values.
CONTEXT context;
HANDLE myProcess = data->process;
HANDLE myThread = data->thread;
FILE* aStream = data->stream;
DWORD64 addr;
STACKFRAME64 frame64;
int skip = 6; // skip our own stack walking frames
BOOL ok;
// Get a context for the specified thread.
memset(&context, 0, sizeof(CONTEXT));
context.ContextFlags = CONTEXT_FULL;
if (!GetThreadContext(myThread, &context)) {
PrintError("GetThreadContext", aStream);
return;
}
// Setup initial stack frame to walk from
memset(&frame64, 0, sizeof(frame64));
#ifdef _M_IX86
frame64.AddrPC.Offset = context.Eip;
frame64.AddrStack.Offset = context.Esp;
frame64.AddrFrame.Offset = context.Ebp;
#elif defined _M_AMD64
frame64.AddrPC.Offset = context.Rip;
frame64.AddrStack.Offset = context.Rsp;
frame64.AddrFrame.Offset = context.Rbp;
#elif defined _M_IA64
frame64.AddrPC.Offset = context.StIIP;
frame64.AddrStack.Offset = context.SP;
frame64.AddrFrame.Offset = context.RsBSP;
#else
fprintf(aStream, "Unknown platform. No stack walking.");
return;
#endif
frame64.AddrPC.Mode = AddrModeFlat;
frame64.AddrStack.Mode = AddrModeFlat;
frame64.AddrFrame.Mode = AddrModeFlat;
frame64.AddrReturn.Mode = AddrModeFlat;
// Now walk the stack and map the pc's to symbol names
while (1) {
ok = 0;
// stackwalk is not threadsafe, so grab the lock.
DWORD dwWaitResult;
dwWaitResult = WaitForSingleObject(hStackWalkMutex, INFINITE);
if (dwWaitResult == WAIT_OBJECT_0) {
ok = _StackWalk64(
#ifdef _M_AMD64
IMAGE_FILE_MACHINE_AMD64,
#elif defined _M_IA64
IMAGE_FILE_MACHINE_IA64,
#elif defined _M_IX86
IMAGE_FILE_MACHINE_I386,
#else
0,
#endif
myProcess,
myThread,
&frame64,
&context,
NULL,
_SymFunctionTableAccess64, // function table access routine
_SymGetModuleBase64, // module base routine
0
);
if (ok)
addr = frame64.AddrPC.Offset;
else
PrintError("WalkStack64", aStream);
if (!ok || (addr == 0)) {
ReleaseMutex(hStackWalkMutex); // release our lock
break;
}
if (skip-- > 0) {
ReleaseMutex(hStackWalkMutex); // release our lock
continue;
}
//
// Attempt to load module info before we attempt to reolve the symbol.
// This just makes sure we get good info if available.
//
IMAGEHLP_MODULE64 modInfo;
modInfo.SizeOfStruct = sizeof(modInfo);
BOOL modInfoRes;
modInfoRes = SymGetModuleInfoEspecial64(myProcess, addr, &modInfo, nsnull);
ULONG64 buffer[(sizeof(SYMBOL_INFO) +
MAX_SYM_NAME*sizeof(TCHAR) + sizeof(ULONG64) - 1) / sizeof(ULONG64)];
PSYMBOL_INFO pSymbol = (PSYMBOL_INFO)buffer;
pSymbol->SizeOfStruct = sizeof(SYMBOL_INFO);
pSymbol->MaxNameLen = MAX_SYM_NAME;
DWORD64 displacement;
ok = _SymFromAddr && _SymFromAddr(myProcess, addr, &displacement, pSymbol);
// All done with debug calls so release our lock.
ReleaseMutex(hStackWalkMutex);
if (ok)
fprintf(aStream, "%s!%s+0x%016X\n", modInfo.ModuleName, pSymbol->Name, displacement);
else
fprintf(aStream, "0x%016X\n", addr);
// Stop walking when we get to kernel32.
if (strcmp(modInfo.ModuleName, "kernel32") == 0)
break;
}
else {
PrintError("LockError64", aStream);
}
}
return;
#endif
}
void
DumpStackToFileMain(struct DumpStackToFileData* data)
{
// Get the context information for the thread. That way we will
// know where our sp, fp, pc, etc. are and can fill in the
// STACKFRAME with the initial values.
CONTEXT context;
HANDLE myProcess = data->process;
HANDLE myThread = data->thread;
FILE* aStream = data->stream;
DWORD addr;
STACKFRAME frame;
int skip = 2; // skip our own stack walking frames
BOOL ok;
// Get a context for the specified thread.
memset(&context, 0, sizeof(CONTEXT));
context.ContextFlags = CONTEXT_FULL;
if (!GetThreadContext(myThread, &context)) {
PrintError("GetThreadContext", aStream);
return;
}
// Setup initial stack frame to walk from
#if defined _M_IX86
memset(&frame, 0, sizeof(frame));
frame.AddrPC.Offset = context.Eip;
frame.AddrPC.Mode = AddrModeFlat;
frame.AddrStack.Offset = context.Esp;
frame.AddrStack.Mode = AddrModeFlat;
frame.AddrFrame.Offset = context.Ebp;
frame.AddrFrame.Mode = AddrModeFlat;
#else
fprintf(aStream, "Unknown platform. No stack walking.");
return;
#endif
// Now walk the stack and map the pc's to symbol names
while (1) {
ok = 0;
// debug routines are not threadsafe, so grab the lock.
DWORD dwWaitResult;
dwWaitResult = WaitForSingleObject(hStackWalkMutex, INFINITE);
if (dwWaitResult == WAIT_OBJECT_0) {
ok = _StackWalk(
IMAGE_FILE_MACHINE_I386,
myProcess,
myThread,
&frame,
&context,
0, // read process memory routine
_SymFunctionTableAccess, // function table access routine
_SymGetModuleBase, // module base routine
0 // translate address routine
);
if (ok)
addr = frame.AddrPC.Offset;
else
PrintError("WalkStack", aStream);
if (!ok || (addr == 0)) {
ReleaseMutex(hStackWalkMutex); // release our lock
break;
}
if (skip-- > 0) {
ReleaseMutex(hStackWalkMutex); // release the lock
continue;
}
//
// Attempt to load module info before we attempt to resolve the symbol.
// This just makes sure we get good info if available.
//
IMAGEHLP_MODULE modInfo;
modInfo.SizeOfStruct = sizeof(modInfo);
BOOL modInfoRes;
modInfoRes = SymGetModuleInfoEspecial(myProcess, addr, &modInfo, nsnull);
#ifdef USING_WXP_VERSION
ULONG64 buffer[(sizeof(SYMBOL_INFO) +
MAX_SYM_NAME*sizeof(TCHAR) + sizeof(ULONG64) - 1) / sizeof(ULONG64)];
PSYMBOL_INFO pSymbol = (PSYMBOL_INFO)buffer;
pSymbol->SizeOfStruct = sizeof(SYMBOL_INFO);
pSymbol->MaxNameLen = MAX_SYM_NAME;
DWORD64 displacement;
ok = _SymFromAddr && _SymFromAddr(myProcess, addr, &displacement, pSymbol);
#else
char buf[sizeof(IMAGEHLP_SYMBOL) + 512];
PIMAGEHLP_SYMBOL pSymbol = (PIMAGEHLP_SYMBOL) buf;
pSymbol->SizeOfStruct = sizeof(buf);
pSymbol->MaxNameLength = 512;
DWORD displacement;
ok = _SymGetSymFromAddr(myProcess,
frame.AddrPC.Offset,
&displacement,
pSymbol);
#endif
// All done with debug calls so release our lock.
ReleaseMutex(hStackWalkMutex);
if (ok)
fprintf(aStream, "%s!%s+0x%08X\n", modInfo.ImageName, pSymbol->Name, displacement);
else
fprintf(aStream, "0x%08X\n", (DWORD) addr);
// Stop walking when we get to kernel32.dll.
if (strcmp(modInfo.ImageName, "kernel32.dll") == 0)
break;
}
else {
PrintError("LockError", aStream);
}
}
return;
}
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