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// Copyright Epic Games, Inc. All Rights Reserved.
#include <zencore/callstack.h>
#include <zencore/filesystem.h>
#include <zencore/thread.h>
#if ZEN_PLATFORM_WINDOWS
# include <zencore/windows.h>
# include <Dbghelp.h>
#endif
#if ZEN_PLATFORM_LINUX || ZEN_PLATFORM_MAC
# include <execinfo.h>
#endif
#if ZEN_WITH_TESTS
# include <zencore/testing.h>
#endif
#include <fmt/format.h>
namespace zen {
#if ZEN_PLATFORM_WINDOWS
class WinSymbolInit
{
public:
WinSymbolInit() {}
~WinSymbolInit()
{
m_CallstackLock.WithExclusiveLock([this]() {
if (m_Initialized)
{
SymCleanup(m_CurrentProcess);
}
});
}
bool GetSymbol(void* Frame, SYMBOL_INFO* OutSymbolInfo, DWORD64& OutDisplacement)
{
bool Result = false;
m_CallstackLock.WithExclusiveLock([&]() {
if (!m_Initialized)
{
m_CurrentProcess = GetCurrentProcess();
std::filesystem::path ProgramBaseDir = GetRunningExecutablePath().parent_path();
if (SymInitializeW(m_CurrentProcess, ProgramBaseDir.c_str(), TRUE) == TRUE)
{
m_Initialized = true;
}
}
if (m_Initialized)
{
if (SymFromAddr(m_CurrentProcess, (DWORD64)Frame, &OutDisplacement, OutSymbolInfo) == TRUE)
{
Result = true;
}
}
});
return Result;
}
private:
HANDLE m_CurrentProcess = NULL;
BOOL m_Initialized = FALSE;
RwLock m_CallstackLock;
};
static WinSymbolInit WinSymbols;
#endif
CallstackFrames*
CreateCallstack(uint32_t FrameCount, void** Frames) noexcept
{
if (FrameCount == 0)
{
return nullptr;
}
CallstackFrames* Callstack = (CallstackFrames*)malloc(sizeof(CallstackFrames) + sizeof(void*) * FrameCount);
if (Callstack != nullptr)
{
Callstack->FrameCount = FrameCount;
if (FrameCount == 0)
{
Callstack->Frames = nullptr;
}
else
{
Callstack->Frames = (void**)&Callstack[1];
memcpy(Callstack->Frames, Frames, sizeof(void*) * FrameCount);
}
}
return Callstack;
}
CallstackFrames*
CloneCallstack(const CallstackFrames* Callstack) noexcept
{
if (Callstack == nullptr)
{
return nullptr;
}
return CreateCallstack(Callstack->FrameCount, Callstack->Frames);
}
void
FreeCallstack(CallstackFrames* Callstack) noexcept
{
if (Callstack != nullptr)
{
free(Callstack);
}
}
uint32_t
GetCallstack(int FramesToSkip, int FramesToCapture, void* OutAddresses[])
{
#if ZEN_PLATFORM_WINDOWS
return (uint32_t)CaptureStackBackTrace(FramesToSkip, FramesToCapture, OutAddresses, 0);
#endif
#if ZEN_PLATFORM_LINUX || ZEN_PLATFORM_MAC
void* Frames[FramesToSkip + FramesToCapture];
int FrameCount = backtrace(Frames, FramesToSkip + FramesToCapture);
if (FrameCount > FramesToSkip)
{
for (int Index = FramesToSkip; Index < FrameCount; Index++)
{
OutAddresses[Index - FramesToSkip] = Frames[Index];
}
return (uint32_t)(FrameCount - FramesToSkip);
}
else
{
return 0;
}
#endif
}
std::vector<std::string>
GetFrameSymbols(uint32_t FrameCount, void** Frames)
{
std::vector<std::string> FrameSymbols;
if (FrameCount > 0)
{
FrameSymbols.resize(FrameCount);
#if ZEN_PLATFORM_WINDOWS
char SymbolBuffer[sizeof(SYMBOL_INFO) + 1024];
SYMBOL_INFO* SymbolInfo = (SYMBOL_INFO*)SymbolBuffer;
SymbolInfo->SizeOfStruct = sizeof(SYMBOL_INFO);
SymbolInfo->MaxNameLen = 1023;
DWORD64 Displacement = 0;
for (uint32_t FrameIndex = 0; FrameIndex < FrameCount; FrameIndex++)
{
if (WinSymbols.GetSymbol(Frames[FrameIndex], SymbolInfo, Displacement))
{
FrameSymbols[FrameIndex] = fmt::format("{}+{:#x} [{:#x}]", SymbolInfo->Name, Displacement, (uintptr_t)Frames[FrameIndex]);
}
}
#endif
#if ZEN_PLATFORM_LINUX || ZEN_PLATFORM_MAC
char** messages = backtrace_symbols(Frames, (int)FrameCount);
if (messages)
{
for (uint32_t FrameIndex = 0; FrameIndex < FrameCount; FrameIndex++)
{
FrameSymbols[FrameIndex] = messages[FrameIndex];
}
free(messages);
}
#endif
}
return FrameSymbols;
}
void
FormatCallstack(const CallstackFrames* Callstack, StringBuilderBase& SB, std::string_view Prefix)
{
bool First = true;
for (const std::string& Symbol : GetFrameSymbols(Callstack))
{
try
{
if (!First)
{
SB.Append("\n");
}
else
{
First = false;
}
if (!Prefix.empty())
{
SB.Append(Prefix);
}
SB.Append(Symbol);
}
catch (const std::exception&)
{
break;
}
}
}
std::string
CallstackToString(const CallstackFrames* Callstack, std::string_view Prefix)
{
StringBuilder<2048> SB;
FormatCallstack(Callstack, SB, Prefix);
return SB.ToString();
}
void
CallstackToStringRaw(const CallstackFrames* Callstack, void* CallbackUserData, CallstackRawCallback Callback)
{
if (Callstack && Callstack->FrameCount > 0)
{
#if ZEN_PLATFORM_WINDOWS
char SymbolBuffer[sizeof(SYMBOL_INFO) + 1024];
SYMBOL_INFO* SymbolInfo = (SYMBOL_INFO*)SymbolBuffer;
SymbolInfo->SizeOfStruct = sizeof(SYMBOL_INFO);
SymbolInfo->MaxNameLen = 1023;
DWORD64 Displacement = 0;
fmt::basic_memory_buffer<char, 2048> Message;
for (uint32_t FrameIndex = 0; FrameIndex < Callstack->FrameCount; FrameIndex++)
{
if (WinSymbols.GetSymbol(Callstack->Frames[FrameIndex], SymbolInfo, Displacement))
{
auto Appender = fmt::appender(Message);
fmt::format_to(Appender, "{}+{:#x} [{:#x}]", SymbolInfo->Name, Displacement, (uintptr_t)Callstack->Frames[FrameIndex]);
Message.push_back('\0');
Callback(CallbackUserData, FrameIndex, Message.data());
Message.resize(0);
}
}
#endif
#if ZEN_PLATFORM_LINUX || ZEN_PLATFORM_MAC
char** messages = backtrace_symbols(Callstack->Frames, (int)Callstack->FrameCount);
if (messages)
{
for (uint32_t FrameIndex = 0; FrameIndex < Callstack->FrameCount; FrameIndex++)
{
Callback(CallbackUserData, FrameIndex, messages[FrameIndex]);
}
free(messages);
}
#endif
}
}
CallstackFrames*
GetCallstackRaw(void* CaptureBuffer, int FramesToSkip, int FramesToCapture)
{
CallstackFrames* Callstack = (CallstackFrames*)CaptureBuffer;
Callstack->Frames = (void**)&Callstack[1];
Callstack->FrameCount = GetCallstack(FramesToSkip, FramesToCapture, Callstack->Frames);
return Callstack;
}
#if ZEN_WITH_TESTS
TEST_CASE("Callstack.Basic")
{
void* Addresses[4];
uint32_t FrameCount = GetCallstack(1, 4, Addresses);
CHECK(FrameCount > 0);
std::vector<std::string> Symbols = GetFrameSymbols(FrameCount, Addresses);
for (const std::string& Symbol : Symbols)
{
CHECK(!Symbol.empty());
}
}
void
callstack_forcelink()
{
}
#endif
} // namespace zen
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