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/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
* Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <wtf/StackTrace.h>
#include <wtf/Assertions.h>
#include <wtf/PrintStream.h>
#if HAVE(BACKTRACE_SYMBOLS) || HAVE(BACKTRACE)
#include <execinfo.h>
#endif
#if HAVE(DLADDR)
#include <cxxabi.h>
#include <dlfcn.h>
#endif
#if OS(WINDOWS)
#include <windows.h>
#include <wtf/win/DbgHelperWin.h>
#endif
void WTFGetBacktrace(void** stack, int* size)
{
#if HAVE(BACKTRACE)
*size = backtrace(stack, *size);
#elif OS(WINDOWS)
*size = RtlCaptureStackBackTrace(0, *size, stack, nullptr);
#else
UNUSED_PARAM(stack);
*size = 0;
#endif
}
namespace WTF {
ALWAYS_INLINE size_t StackTrace::instanceSize(int capacity)
{
ASSERT(capacity >= 1);
return sizeof(StackTrace) + (capacity - 1) * sizeof(void*);
}
std::unique_ptr<StackTrace> StackTrace::captureStackTrace(int maxFrames, int framesToSkip)
{
maxFrames = std::max(1, maxFrames);
size_t sizeToAllocate = instanceSize(maxFrames);
std::unique_ptr<StackTrace> trace(new (NotNull, fastMalloc(sizeToAllocate)) StackTrace());
// Skip 2 additional frames i.e. StackTrace::captureStackTrace and WTFGetBacktrace.
framesToSkip += 2;
int numberOfFrames = maxFrames + framesToSkip;
WTFGetBacktrace(&trace->m_skippedFrame0, &numberOfFrames);
if (numberOfFrames) {
RELEASE_ASSERT(numberOfFrames >= framesToSkip);
trace->m_size = numberOfFrames - framesToSkip;
} else
trace->m_size = 0;
trace->m_capacity = maxFrames;
return trace;
}
auto StackTrace::demangle(void* pc) -> std::optional<DemangleEntry>
{
#if HAVE(DLADDR)
const char* mangledName = nullptr;
const char* cxaDemangled = nullptr;
Dl_info info;
if (dladdr(pc, &info) && info.dli_sname)
mangledName = info.dli_sname;
if (mangledName) {
int status = 0;
cxaDemangled = abi::__cxa_demangle(mangledName, nullptr, nullptr, &status);
UNUSED_PARAM(status);
}
if (mangledName || cxaDemangled)
return DemangleEntry { mangledName, cxaDemangled };
#else
UNUSED_PARAM(pc);
#endif
return std::nullopt;
}
void StackTrace::dump(PrintStream& out, const char* indentString) const
{
const auto* stack = this->stack();
#if HAVE(BACKTRACE_SYMBOLS)
char** symbols = backtrace_symbols(stack, m_size);
if (!symbols)
return;
#elif OS(WINDOWS)
HANDLE hProc = GetCurrentProcess();
uint8_t symbolData[sizeof(SYMBOL_INFO) + MAX_SYM_NAME * sizeof(TCHAR)] = { 0 };
auto symbolInfo = reinterpret_cast<SYMBOL_INFO*>(symbolData);
symbolInfo->SizeOfStruct = sizeof(SYMBOL_INFO);
symbolInfo->MaxNameLen = MAX_SYM_NAME;
#endif
if (!indentString)
indentString = "";
for (int i = 0; i < m_size; ++i) {
const char* mangledName = nullptr;
const char* cxaDemangled = nullptr;
#if HAVE(BACKTRACE_SYMBOLS)
mangledName = symbols[i];
#elif OS(WINDOWS)
if (DbgHelper::SymFromAddress(hProc, reinterpret_cast<DWORD64>(stack[i]), nullptr, symbolInfo))
mangledName = symbolInfo->Name;
#endif
auto demangled = demangle(stack[i]);
if (demangled) {
mangledName = demangled->mangledName();
cxaDemangled = demangled->demangledName();
}
const int frameNumber = i + 1;
if (mangledName || cxaDemangled)
out.printf("%s%s%-3d %p %s\n", m_prefix ? m_prefix : "", indentString, frameNumber, stack[i], cxaDemangled ? cxaDemangled : mangledName);
else
out.printf("%s%s%-3d %p\n", m_prefix ? m_prefix : "", indentString, frameNumber, stack[i]);
}
#if HAVE(BACKTRACE_SYMBOLS)
free(symbols);
#endif
}
} // namespace WTF
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