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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 <type_traits>
#include <wtf/Assertions.h>
#include <wtf/PrintStream.h>
#include <wtf/StringPrintStream.h>
#if USE(LIBBACKTRACE)
#include <string.h>
#include <wtf/NeverDestroyed.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 {
#if USE(LIBBACKTRACE)
static struct backtrace_state* backtraceState()
{
static NeverDestroyed<struct backtrace_state*> backtraceState = backtrace_create_state(nullptr, 1, nullptr, nullptr);
return backtraceState;
}
static void backtraceSyminfoCallback(void* data, uintptr_t, const char* symname, uintptr_t, uintptr_t)
{
const char** symbol = static_cast<const char**>(data);
*symbol = symname;
}
static int backtraceFullCallback(void* data, uintptr_t, const char*, int, const char* function)
{
const char** symbol = static_cast<const char**>(data);
*symbol = function;
return 0;
}
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
char** symbolize(void* const* addresses, int size)
{
struct backtrace_state* state = backtraceState();
if (!state)
return nullptr;
char** symbols = static_cast<char**>(malloc(sizeof(char*) * size));
for (int i = 0; i < size; ++i) {
uintptr_t pc = reinterpret_cast<uintptr_t>(addresses[i]);
char* symbol;
backtrace_pcinfo(state, pc, backtraceFullCallback, nullptr, &symbol);
if (!symbol)
backtrace_syminfo(backtraceState(), pc, backtraceSyminfoCallback, nullptr, &symbol);
if (symbol) {
char* demangled = abi::__cxa_demangle(symbol, nullptr, nullptr, nullptr);
if (demangled)
symbols[i] = demangled;
else
symbols[i] = strdup(symbol);
} else
symbols[i] = strdup("???");
}
return symbols;
}
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#endif
std::unique_ptr<StackTrace> StackTrace::captureStackTrace(size_t maxFrames, size_t framesToSkip)
{
static_assert(sizeof(StackTrace) == sizeof(void*) * 3);
// We overwrite the memory of the two first skipped frames, m_stack[0] will hold the third one.
static_assert(offsetof(StackTrace, m_stack) == sizeof(void*) * 2);
maxFrames = std::max<size_t>(1, maxFrames);
// Skip 2 additional frames i.e. StackTrace::captureStackTrace and WTFGetBacktrace.
framesToSkip += 2;
size_t capacity = maxFrames + framesToSkip;
void** storage = static_cast<void**>(fastMalloc(capacity * sizeof(void*)));
size_t size = 0;
size_t initialFrame = 0;
int capturedFrames = static_cast<int>(capacity);
WTFGetBacktrace(storage, &capturedFrames);
if (static_cast<size_t>(capturedFrames) > framesToSkip) {
size = static_cast<size_t>(capturedFrames) - framesToSkip;
initialFrame = framesToSkip - 2;
}
return std::unique_ptr<StackTrace> { new (NotNull, storage) StackTrace(size, initialFrame) };
}
String StackTrace::toString() const
{
StringPrintStream stream;
dump(stream);
return stream.toString();
}
auto StackTraceSymbolResolver::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 StackTracePrinter::dump(PrintStream& out) const
{
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
StackTraceSymbolResolver { m_stack }.forEach([&](int frameNumber, void* stackFrame, const char* name) {
out.printf("%s%-3d %p %s\n", m_prefix ? m_prefix : "", frameNumber, stackFrame, name);
});
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
}
} // namespace WTF
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