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#include "leaktrace.h"
#include <Windows.h>
#include <DbgHelp.h>
#include <set>
#include <map>
#include <vector>
#include <sstream>
#include <algorithm>
static const int FRAMES_TO_SKIP = 3; // StackData::StackData(), __TraceData::regTrace(), TraceAlloc()
static const int FRAMES_TO_CAPTURE = 10;
void initDbgIfNecessary()
{
HANDLE process = ::GetCurrentProcess();
static std::set<DWORD> initialized;
if (initialized.find(::GetCurrentProcessId()) == initialized.end()) {
static bool firstCall = true;
if (firstCall) {
::SymSetOptions(SYMOPT_UNDNAME | SYMOPT_DEFERRED_LOADS);
firstCall = false;
}
if (!::SymInitialize(process, NULL, TRUE)) {
printf("failed to initialize symbols: %d", ::GetLastError());
}
initialized.insert(::GetCurrentProcessId());
}
}
class StackData {
friend bool operator==(const StackData &LHS, const StackData &RHS);
friend bool operator<(const StackData &LHS, const StackData &RHS);
public:
StackData()
: m_Count(0), m_Hash(0UL), m_FunctionName("Dummy"), m_CodeLine(0)
{}
StackData(const char *functionName, int line) {
m_Count = ::CaptureStackBackTrace(FRAMES_TO_SKIP, FRAMES_TO_CAPTURE, m_Stack, &m_Hash);
m_FunctionName = functionName;
m_CodeLine = line;
if (m_Count == 0) {
// TODO in this case the hash doesn't seem to be set. This is of course not a good solution
m_Hash = reinterpret_cast<unsigned long>(m_FunctionName) + m_CodeLine;
}
}
std::string toString() const {
initDbgIfNecessary();
char buffer[sizeof(SYMBOL_INFO) + MAX_SYM_NAME * sizeof(TCHAR)];
PSYMBOL_INFO symbol = (PSYMBOL_INFO)buffer;
symbol->SizeOfStruct = sizeof(SYMBOL_INFO);
symbol->MaxNameLen = MAX_SYM_NAME;
std::ostringstream stackStream;
stackStream << m_FunctionName << " [" << m_CodeLine << "]\n";
for(unsigned int i = 0; i < m_Count; ++i) {
DWORD64 displacement = 0;
if (!::SymFromAddr(::GetCurrentProcess(), (DWORD64)m_Stack[i], &displacement, symbol)) {
stackStream << m_Count - i - 1 << ": [" << m_Stack[i] << "]\n";
} else {
stackStream << m_Count - i - 1 << ": " << symbol->Name << "\n";
}
}
return stackStream.str();
}
private:
LPVOID m_Stack[FRAMES_TO_CAPTURE];
USHORT m_Count;
ULONG m_Hash;
const char *m_FunctionName;
int m_CodeLine;
};
bool operator==(const StackData &LHS, const StackData &RHS) {
return LHS.m_Hash == RHS.m_Hash;
}
bool operator<(const StackData &LHS, const StackData &RHS) {
return LHS.m_Hash < RHS.m_Hash;
}
static struct __TraceData {
void regTrace(void *pointer, const char *functionName, int line) {
m_Traces[reinterpret_cast<unsigned long>(pointer)] = StackData(functionName, line);
}
void deregTrace(void *pointer) {
auto iter = m_Traces.find(reinterpret_cast<unsigned long>(pointer));
if (iter != m_Traces.end()) {
m_Traces.erase(iter);
}
}
~__TraceData() {
std::map<StackData, std::vector<unsigned long> > result;
for (auto iter = m_Traces.begin(); iter != m_Traces.end(); ++iter) {
result[iter->second].push_back(iter->first);
}
for (auto iter = result.begin(); iter != result.end(); ++iter) {
printf("-----------------------------------\n"
"%d objects not freed, allocated at:\n%s",
iter->second.size(), iter->first.toString().c_str());
printf("Addresses: ");
for (int i = 0; i < (std::min<int>)(5, iter->second.size()); ++i) {
printf("%p, ", iter->second[i]);
}
printf("\n");
}
}
std::map<unsigned long, StackData> m_Traces;
} __trace;
void LeakTrace::TraceAlloc(void *ptr, const char *functionName, int line)
{
__trace.regTrace(ptr, functionName, line);
}
void LeakTrace::TraceDealloc(void *ptr)
{
__trace.deregTrace(ptr);
}
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