void wxStackWalker::ProcessFrames(size_t skip)
{
wxStackFrame frames[MAX_FRAMES];
if (!ms_symbols || !m_depth)
return;
// we have 3 more "intermediate" frames which the calling code doesn't know
// about, account for them
skip += 3;
// call addr2line only once since this call may be very slow
// (it has to load in memory the entire EXE of this app which may be quite
// big, especially if it contains debug info and is compiled statically!)
int towalk = InitFrames(frames, m_depth - skip, &ms_addresses[skip], &ms_symbols[skip]);
// now do user-defined operations on each frame
for ( int n = 0; n < towalk - (int)skip; n++ )
OnStackFrame(frames[n]);
}
void wxStackWalker::ProcessFrames(size_t skip)
{
wxStackFrame frames[MAX_FRAMES];
if (!ms_symbols || !m_depth)
return;
// we are another level down from Walk(), so adjust the number of stack
// frames to skip accordingly
skip += 1;
// call addr2line only once since this call may be very slow
// (it has to load in memory the entire EXE of this app which may be quite
// big, especially if it contains debug info and is compiled statically!)
int numFrames = InitFrames(frames, m_depth - skip,
&ms_addresses[skip], &ms_symbols[skip]);
// now do user-defined operations on each frame
for ( int n = 0; n < numFrames; n++ )
OnStackFrame(frames[n]);
}
void wxStackWalker::WalkFrom(const CONTEXT *pCtx, size_t skip)
{
#if wxUSE_THREADS
// wxDbgHelpDLL has its own mutex locks for some critical functions, but really it
// should have locks on ALL its functions. So until it gets fixed, we'll use a
// mutex here for stackframe walking. --air
wxMutexLocker lock(s_mtx_StackWalker);
#endif
if ( !wxDbgHelpDLL::Init() )
{
// don't log a user-visible error message here because the stack trace
// is only needed for debugging/diagnostics anyhow and we shouldn't
// confuse the user by complaining that we couldn't generate it
wxLogDebug(_T("Failed to get stack backtrace: %s"),
wxDbgHelpDLL::GetErrorMessage().c_str());
return;
}
// according to MSDN, the first parameter should be just a unique value and
// not process handle (although the parameter is prototyped as "HANDLE
// hProcess") and actually it advises to use the process id and not handle
// for Win9x, but then we need to use the same value in StackWalk() call
// below which should be a real handle... so this is what we use
const HANDLE hProcess = ::GetCurrentProcess();
if ( !wxDbgHelpDLL::RefreshModuleList(hProcess) ) return;
CONTEXT ctx = *pCtx; // will be modified by StackWalk()
DWORD dwMachineType;
// initialize the initial frame: currently we can do it for x86 only
STACKFRAME sf;
wxZeroMemory(sf);
#ifdef _M_IX86
sf.AddrPC.Offset = ctx.Eip;
sf.AddrPC.Mode = AddrModeFlat;
sf.AddrStack.Offset = ctx.Esp;
sf.AddrStack.Mode = AddrModeFlat;
sf.AddrFrame.Offset = ctx.Ebp;
sf.AddrFrame.Mode = AddrModeFlat;
dwMachineType = IMAGE_FILE_MACHINE_I386;
#else
#error "Need to initialize STACKFRAME on non x86"
#endif // _M_IX86
// iterate over all stack frames (but stop after 200 to avoid entering
// infinite loop if the stack is corrupted)
for ( size_t nLevel = 0; nLevel < 200; nLevel++ )
{
// get the next stack frame
if ( !wxDbgHelpDLL::StackWalk
(
dwMachineType,
hProcess,
::GetCurrentThread(),
&sf,
&ctx,
NULL, // read memory function (default)
wxDbgHelpDLL::SymFunctionTableAccess,
wxDbgHelpDLL::SymGetModuleBase,
NULL // address translator for 16 bit
) )
{
if ( ::GetLastError() )
wxDbgHelpDLL::LogError(_T("StackWalk"));
break;
}
// don't show this frame itself in the output
if ( nLevel >= skip )
{
wxStackFrame frame(nLevel - skip,
(void *)sf.AddrPC.Offset,
sf.AddrFrame.Offset);
OnStackFrame(frame);
}
}
// this results in crashes inside ntdll.dll when called from
// exception handler ...
#if 0
if ( !wxDbgHelpDLL::SymCleanup(hProcess) )
{
wxDbgHelpDLL::LogError(_T("SymCleanup"));
}
#endif
}
void wxStackWalker::WalkFrom(const CONTEXT *pCtx, size_t skip)
{
if ( !wxDbgHelpDLL::Init() )
{
wxLogError(_("Failed to get stack backtrace:\n%s"),
wxDbgHelpDLL::GetErrorMessage().c_str());
return;
}
// according to MSDN, the first parameter should be just a unique value and
// not process handle (although the parameter is prototyped as "HANDLE
// hProcess") and actually it advises to use the process id and not handle
// for Win9x, but then we need to use the same value in StackWalk() call
// below which should be a real handle... so this is what we use
const HANDLE hProcess = ::GetCurrentProcess();
if ( !wxDbgHelpDLL::SymInitialize
(
hProcess,
NULL, // use default symbol search path
TRUE // load symbols for all loaded modules
) )
{
wxDbgHelpDLL::LogError(_T("SymInitialize"));
return;
}
CONTEXT ctx = *pCtx; // will be modified by StackWalk()
DWORD dwMachineType;
// initialize the initial frame: currently we can do it for x86 only
STACKFRAME sf;
wxZeroMemory(sf);
#ifdef _M_IX86
sf.AddrPC.Offset = ctx.Eip;
sf.AddrPC.Mode = AddrModeFlat;
sf.AddrStack.Offset = ctx.Esp;
sf.AddrStack.Mode = AddrModeFlat;
sf.AddrFrame.Offset = ctx.Ebp;
sf.AddrFrame.Mode = AddrModeFlat;
dwMachineType = IMAGE_FILE_MACHINE_I386;
#else
#error "Need to initialize STACKFRAME on non x86"
#endif // _M_IX86
// iterate over all stack frames
for ( size_t nLevel = 0; ; nLevel++ )
{
// get the next stack frame
if ( !wxDbgHelpDLL::StackWalk
(
dwMachineType,
hProcess,
::GetCurrentThread(),
&sf,
&ctx,
NULL, // read memory function (default)
wxDbgHelpDLL::SymFunctionTableAccess,
wxDbgHelpDLL::SymGetModuleBase,
NULL // address translator for 16 bit
) )
{
if ( ::GetLastError() )
wxDbgHelpDLL::LogError(_T("StackWalk"));
break;
}
// don't show this frame itself in the output
if ( nLevel >= skip )
{
wxStackFrame frame(nLevel - skip,
(void *)sf.AddrPC.Offset,
sf.AddrFrame.Offset);
OnStackFrame(frame);
}
}
// this results in crashes inside ntdll.dll when called from
// exception handler ...
#if 0
if ( !wxDbgHelpDLL::SymCleanup(hProcess) )
{
wxDbgHelpDLL::LogError(_T("SymCleanup"));
}
#endif
}
void wxStackWalker::WalkFrom(const CONTEXT *pCtx, size_t skip, size_t maxDepth)
{
if ( !wxDbgHelpDLL::Init() )
{
// don't log a user-visible error message here because the stack trace
// is only needed for debugging/diagnostics anyhow and we shouldn't
// confuse the user by complaining that we couldn't generate it
wxLogDebug(wxT("Failed to get stack backtrace: %s"),
wxDbgHelpDLL::GetErrorMessage().c_str());
return;
}
// according to MSDN, the first parameter should be just a unique value and
// not process handle (although the parameter is prototyped as "HANDLE
// hProcess") and actually it advises to use the process id and not handle
// for Win9x, but then we need to use the same value in StackWalk() call
// below which should be a real handle... so this is what we use
const HANDLE hProcess = ::GetCurrentProcess();
if ( !wxDbgHelpDLL::SymInitialize
(
hProcess,
NULL, // use default symbol search path
TRUE // load symbols for all loaded modules
) )
{
wxDbgHelpDLL::LogError(wxT("SymInitialize"));
return;
}
CONTEXT ctx = *pCtx; // will be modified by StackWalk()
DWORD dwMachineType;
// initialize the initial frame: currently we can do it for x86 only
STACKFRAME sf;
wxZeroMemory(sf);
#if defined(_M_AMD64)
sf.AddrPC.Offset = ctx.Rip;
sf.AddrPC.Mode = AddrModeFlat;
sf.AddrStack.Offset = ctx.Rsp;
sf.AddrStack.Mode = AddrModeFlat;
sf.AddrFrame.Offset = ctx.Rbp;
sf.AddrFrame.Mode = AddrModeFlat;
dwMachineType = IMAGE_FILE_MACHINE_AMD64;
#elif defined(_M_IX86)
sf.AddrPC.Offset = ctx.Eip;
sf.AddrPC.Mode = AddrModeFlat;
sf.AddrStack.Offset = ctx.Esp;
sf.AddrStack.Mode = AddrModeFlat;
sf.AddrFrame.Offset = ctx.Ebp;
sf.AddrFrame.Mode = AddrModeFlat;
dwMachineType = IMAGE_FILE_MACHINE_I386;
#else
#error "Need to initialize STACKFRAME on non x86"
#endif // _M_IX86
// iterate over all stack frames
for ( size_t nLevel = 0; nLevel < maxDepth; nLevel++ )
{
// get the next stack frame
if ( !wxDbgHelpDLL::StackWalk
(
dwMachineType,
hProcess,
::GetCurrentThread(),
&sf,
&ctx,
NULL, // read memory function (default)
wxDbgHelpDLL::SymFunctionTableAccess,
wxDbgHelpDLL::SymGetModuleBase,
NULL // address translator for 16 bit
) )
{
if ( ::GetLastError() )
wxDbgHelpDLL::LogError(wxT("StackWalk"));
break;
}
// don't show this frame itself in the output
if ( nLevel >= skip )
{
wxStackFrame frame(nLevel - skip,
wxUIntToPtr(sf.AddrPC.Offset),
sf.AddrFrame.Offset);
OnStackFrame(frame);
}
}
if ( !wxDbgHelpDLL::SymCleanup(hProcess) )
{
wxDbgHelpDLL::LogError(wxT("SymCleanup"));
}
}
