// isCrtStartupAlloc - Determines whether the memory leak was generated from crt startup code.
// This is not an actual memory leaks as it is freed by crt after the VLD object has been destroyed.
//
// Return Value:
//
// true if isCrtStartupModule for any callstack frame returns true.
//
bool CallStack::isCrtStartupAlloc()
{
if (m_status & CALLSTACK_STATUS_STARTUPCRT) {
return true;
} else if (m_status & CALLSTACK_STATUS_NOTSTARTUPCRT) {
return false;
}
IMAGEHLP_LINE64 sourceInfo = { 0 };
sourceInfo.SizeOfStruct = sizeof(IMAGEHLP_LINE64);
BYTE symbolBuffer[sizeof(SYMBOL_INFO) + MAX_SYMBOL_NAME_SIZE] = { 0 };
CriticalSectionLocker<DbgHelp> locker(g_DbgHelp);
// Iterate through each frame in the call stack.
for (UINT32 frame = 0; frame < m_size; frame++) {
// Try to get the source file and line number associated with
// this program counter address.
SIZE_T programCounter = (*this)[frame];
BOOL foundline = FALSE;
DWORD displacement = 0;
DbgTrace(L"dbghelp32.dll %i: SymGetLineFromAddrW64\n", GetCurrentThreadId());
foundline = g_DbgHelp.SymGetLineFromAddrW64(g_currentProcess, programCounter, &displacement, &sourceInfo);
if (foundline) {
DWORD64 displacement64;
LPCWSTR functionName = getFunctionName(programCounter, displacement64, (SYMBOL_INFO*)&symbolBuffer, locker);
if (beginWith(functionName, wcslen(functionName), L"`dynamic initializer for '")) {
break;
}
if (isCrtStartupModule(sourceInfo.FileName)) {
m_status |= CALLSTACK_STATUS_STARTUPCRT;
return true;
}
}
}
m_status |= CALLSTACK_STATUS_NOTSTARTUPCRT;
return false;
}
// Resolve - Creates a nicely formatted rendition of the CallStack, including
// symbolic information (function names and line numbers) if available. and
// saves it for later retrieval. This is almost identical to Callstack::dump above.
//
// Note: The symbol handler must be initialized prior to calling this
// function.
//
// - showInternalFrames (IN): If true, then all frames in the CallStack will be
// dumped. Otherwise, frames internal to the heap will not be dumped.
//
// Return Value:
//
// None.
//
int CallStack::resolve(BOOL showInternalFrames)
{
if (m_resolved)
{
// already resolved, no need to do it again
// resolving twice may report an incorrect module for the stack frames
// if the memory was leaked in a dynamic library that was already unloaded.
return 0;
}
if (m_status & CALLSTACK_STATUS_STARTUPCRT) {
// there is no need to resolve a leak that will not be reported
return 0;
}
if (m_status & CALLSTACK_STATUS_INCOMPLETE) {
// This call stack appears to be incomplete. Using StackWalk64 may be
// more reliable.
Report(L" HINT: The following call stack may be incomplete. Setting \"StackWalkMethod\"\n"
L" in the vld.ini file to \"safe\" instead of \"fast\" may result in a more\n"
L" complete stack trace.\n");
}
int unresolvedFunctionsCount = 0;
IMAGEHLP_LINE64 sourceInfo = { 0 };
sourceInfo.SizeOfStruct = sizeof(IMAGEHLP_LINE64);
bool skipStartupLeaks = !!(g_vld.GetOptions() & VLD_OPT_SKIP_CRTSTARTUP_LEAKS);
// Use static here to increase performance, and avoid heap allocs.
// It's thread safe because of g_heapMapLock lock.
static WCHAR stack_line[MAXREPORTLENGTH + 1] = L"";
bool isPrevFrameInternal = false;
bool isDynamicInitializer = false;
DWORD NumChars = 0;
CriticalSectionLocker<DbgHelp> locker(g_DbgHelp);
const size_t max_line_length = MAXREPORTLENGTH + 1;
m_resolvedCapacity = m_size * max_line_length;
const size_t allocedBytes = m_resolvedCapacity * sizeof(WCHAR);
m_resolved = new WCHAR[m_resolvedCapacity];
if (m_resolved) {
ZeroMemory(m_resolved, allocedBytes);
}
// Iterate through each frame in the call stack.
for (UINT32 frame = 0; frame < m_size; frame++)
{
// Try to get the source file and line number associated with
// this program counter address.
SIZE_T programCounter = (*this)[frame];
DWORD displacement = 0;
// It turns out that calls to SymGetLineFromAddrW64 may free the very memory we are scrutinizing here
// in this method. If this is the case, m_Resolved will be null after SymGetLineFromAddrW64 returns.
// When that happens there is nothing we can do except crash.
DbgTrace(L"dbghelp32.dll %i: SymGetLineFromAddrW64\n", GetCurrentThreadId());
BOOL foundline = g_DbgHelp.SymGetLineFromAddrW64(g_currentProcess, programCounter, &displacement, &sourceInfo, locker);
if (skipStartupLeaks && foundline && !isDynamicInitializer &&
!(m_status & CALLSTACK_STATUS_NOTSTARTUPCRT) && isCrtStartupModule(sourceInfo.FileName)) {
m_status |= CALLSTACK_STATUS_STARTUPCRT;
delete[] m_resolved;
m_resolved = NULL;
m_resolvedCapacity = 0;
m_resolvedLength = 0;
return 0;
}
bool isFrameInternal = false;
if (foundline && !showInternalFrames) {
if (isInternalModule(sourceInfo.FileName)) {
// Don't show frames in files internal to the heap.
isFrameInternal = true;
}
}
// show one allocation function for context
if (NumChars > 0 && !isFrameInternal && isPrevFrameInternal) {
m_resolvedLength += NumChars;
if (m_resolved) {
wcsncat_s(m_resolved, m_resolvedCapacity, stack_line, NumChars);
}
}
isPrevFrameInternal = isFrameInternal;
DWORD64 displacement64;
BYTE symbolBuffer[sizeof(SYMBOL_INFO) + MAX_SYMBOL_NAME_SIZE];
LPCWSTR functionName = getFunctionName(programCounter, displacement64, (SYMBOL_INFO*)&symbolBuffer, locker);
if (skipStartupLeaks && foundline && beginWith(functionName, wcslen(functionName), L"`dynamic initializer for '")) {
isDynamicInitializer = true;
}
if (!foundline)
displacement = (DWORD)displacement64;
NumChars = resolveFunction( programCounter, foundline ? &sourceInfo : NULL,
displacement, functionName, stack_line, _countof( stack_line ));
if (NumChars > 0 && !isFrameInternal) {
m_resolvedLength += NumChars;
if (m_resolved) {
wcsncat_s(m_resolved, m_resolvedCapacity, stack_line, NumChars);
}
}
} // end for loop
m_status |= CALLSTACK_STATUS_NOTSTARTUPCRT;
return unresolvedFunctionsCount;
}
// dump - Dumps a nicely formatted rendition of the CallStack, including
// symbolic information (function names and line numbers) if available.
//
// Note: The symbol handler must be initialized prior to calling this
// function.
//
// - showinternalframes (IN): If true, then all frames in the CallStack will be
// dumped. Otherwise, frames internal to the heap will not be dumped.
//
// Return Value:
//
// None.
//
void CallStack::dump(BOOL showInternalFrames, UINT start_frame) const
{
// The stack was dumped already
if (m_resolved)
{
dumpResolved();
return;
}
if (m_status & CALLSTACK_STATUS_INCOMPLETE) {
// This call stack appears to be incomplete. Using StackWalk64 may be
// more reliable.
Report(L" HINT: The following call stack may be incomplete. Setting \"StackWalkMethod\"\n"
L" in the vld.ini file to \"safe\" instead of \"fast\" may result in a more\n"
L" complete stack trace.\n");
}
IMAGEHLP_LINE64 sourceInfo = { 0 };
sourceInfo.SizeOfStruct = sizeof(IMAGEHLP_LINE64);
// Use static here to increase performance, and avoid heap allocs.
// It's thread safe because of g_heapMapLock lock.
static WCHAR stack_line[MAXREPORTLENGTH + 1] = L"";
bool isPrevFrameInternal = false;
CriticalSectionLocker<DbgHelp> locker(g_DbgHelp);
// Iterate through each frame in the call stack.
for (UINT32 frame = start_frame; frame < m_size; frame++)
{
// Try to get the source file and line number associated with
// this program counter address.
SIZE_T programCounter = (*this)[frame];
BOOL foundline = FALSE;
DWORD displacement = 0;
DbgTrace(L"dbghelp32.dll %i: SymGetLineFromAddrW64\n", GetCurrentThreadId());
foundline = g_DbgHelp.SymGetLineFromAddrW64(g_currentProcess, programCounter, &displacement, &sourceInfo, locker);
bool isFrameInternal = false;
if (foundline && !showInternalFrames) {
if (isInternalModule(sourceInfo.FileName))
{
// Don't show frames in files internal to the heap.
isFrameInternal = true;
}
}
// show one allocation function for context
if (!isFrameInternal && isPrevFrameInternal)
Print(stack_line);
isPrevFrameInternal = isFrameInternal;
DWORD64 displacement64;
BYTE symbolBuffer[sizeof(SYMBOL_INFO) + MAX_SYMBOL_NAME_SIZE];
LPCWSTR functionName = getFunctionName(programCounter, displacement64, (SYMBOL_INFO*)&symbolBuffer, locker);
if (!foundline)
displacement = (DWORD)displacement64;
DWORD NumChars = resolveFunction(programCounter, foundline ? &sourceInfo : NULL,
displacement, functionName, stack_line, _countof(stack_line));
UNREFERENCED_PARAMETER(NumChars);
if (!isFrameInternal)
Print(stack_line);
}
}
