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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/debug/stack_trace.h"
#include <errno.h>
#include <execinfo.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <unistd.h>
#include <string>
#include <vector>
#if defined(__GLIBCXX__)
#include <cxxabi.h>
#endif
#if defined(OS_MACOSX)
#include <AvailabilityMacros.h>
#endif
#include <iostream>
#include "base/basictypes.h"
#include "base/eintr_wrapper.h"
#include "base/logging.h"
#include "base/safe_strerror_posix.h"
#include "base/scoped_ptr.h"
#include "base/string_piece.h"
#include "base/stringprintf.h"
#if defined(USE_SYMBOLIZE)
#include "base/third_party/symbolize/symbolize.h"
#endif
namespace base {
namespace debug {
namespace {
// The prefix used for mangled symbols, per the Itanium C++ ABI:
// http://www.codesourcery.com/cxx-abi/abi.html#mangling
const char kMangledSymbolPrefix[] = "_Z";
// Characters that can be used for symbols, generated by Ruby:
// (('a'..'z').to_a+('A'..'Z').to_a+('0'..'9').to_a + ['_']).join
const char kSymbolCharacters[] =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_";
#if !defined(USE_SYMBOLIZE)
// Demangles C++ symbols in the given text. Example:
//
// "out/Debug/base_unittests(_ZN10StackTraceC1Ev+0x20) [0x817778c]"
// =>
// "out/Debug/base_unittests(StackTrace::StackTrace()+0x20) [0x817778c]"
void DemangleSymbols(std::string* text) {
#if defined(__GLIBCXX__)
std::string::size_type search_from = 0;
while (search_from < text->size()) {
// Look for the start of a mangled symbol, from search_from.
std::string::size_type mangled_start =
text->find(kMangledSymbolPrefix, search_from);
if (mangled_start == std::string::npos) {
break; // Mangled symbol not found.
}
// Look for the end of the mangled symbol.
std::string::size_type mangled_end =
text->find_first_not_of(kSymbolCharacters, mangled_start);
if (mangled_end == std::string::npos) {
mangled_end = text->size();
}
std::string mangled_symbol =
text->substr(mangled_start, mangled_end - mangled_start);
// Try to demangle the mangled symbol candidate.
int status = 0;
scoped_ptr_malloc<char> demangled_symbol(
abi::__cxa_demangle(mangled_symbol.c_str(), NULL, 0, &status));
if (status == 0) { // Demangling is successful.
// Remove the mangled symbol.
text->erase(mangled_start, mangled_end - mangled_start);
// Insert the demangled symbol.
text->insert(mangled_start, demangled_symbol.get());
// Next time, we'll start right after the demangled symbol we inserted.
search_from = mangled_start + strlen(demangled_symbol.get());
} else {
// Failed to demangle. Retry after the "_Z" we just found.
search_from = mangled_start + 2;
}
}
#endif // defined(__GLIBCXX__)
}
#endif // !defined(USE_SYMBOLIZE)
// Gets the backtrace as a vector of strings. If possible, resolve symbol
// names and attach these. Otherwise just use raw addresses. Returns true
// if any symbol name is resolved. Returns false on error and *may* fill
// in |error_message| if an error message is available.
bool GetBacktraceStrings(void **trace, int size,
std::vector<std::string>* trace_strings,
std::string* error_message) {
#ifdef ANDROID
return false;
#endif
bool symbolized = false;
#if defined(USE_SYMBOLIZE)
for (int i = 0; i < size; ++i) {
char symbol[1024];
// Subtract by one as return address of function may be in the next
// function when a function is annotated as noreturn.
if (google::Symbolize(static_cast<char *>(trace[i]) - 1,
symbol, sizeof(symbol))) {
// Don't call DemangleSymbols() here as the symbol is demangled by
// google::Symbolize().
trace_strings->push_back(
base::StringPrintf("%s [%p]", symbol, trace[i]));
symbolized = true;
} else {
trace_strings->push_back(base::StringPrintf("%p", trace[i]));
}
}
#else
scoped_ptr_malloc<char*> trace_symbols(backtrace_symbols(trace, size));
if (trace_symbols.get()) {
for (int i = 0; i < size; ++i) {
std::string trace_symbol = trace_symbols.get()[i];
DemangleSymbols(&trace_symbol);
trace_strings->push_back(trace_symbol);
}
symbolized = true;
} else {
if (error_message)
*error_message = safe_strerror(errno);
for (int i = 0; i < size; ++i) {
trace_strings->push_back(base::StringPrintf("%p", trace[i]));
}
}
#endif // defined(USE_SYMBOLIZE)
return symbolized;
}
} // namespace
StackTrace::StackTrace() {
#if (defined(OS_MACOSX) && MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5) || defined(ANDROID)
#if defined(ANDROID)
return;
#else
if (backtrace == NULL) {
count_ = 0;
return;
}
#endif // ANDROID
#endif
// Though the backtrace API man page does not list any possible negative
// return values, we take no chance.
count_ = std::max(backtrace(trace_, arraysize(trace_)), 0);
}
void StackTrace::PrintBacktrace() {
#if (defined(OS_MACOSX) && MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5) || defined(ANDROID)
#if defined(ANDROID)
return;
#else
if (backtrace_symbols_fd == NULL)
return;
#endif // ANDROID
#endif
fflush(stderr);
std::vector<std::string> trace_strings;
GetBacktraceStrings(trace_, count_, &trace_strings, NULL);
for (size_t i = 0; i < trace_strings.size(); ++i) {
std::cerr << "\t" << trace_strings[i] << "\n";
}
}
void StackTrace::OutputToStream(std::ostream* os) {
#if (defined(OS_MACOSX) && MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5) || defined(ANDROID)
#if defined(ANDROID)
return;
#else
if (backtrace_symbols == NULL)
return;
#endif // ANDROID
#endif
std::vector<std::string> trace_strings;
std::string error_message;
if (GetBacktraceStrings(trace_, count_, &trace_strings, &error_message)) {
(*os) << "Backtrace:\n";
} else {
if (!error_message.empty())
error_message = " (" + error_message + ")";
(*os) << "Unable to get symbols for backtrace" << error_message << ". "
<< "Dumping raw addresses in trace:\n";
}
for (size_t i = 0; i < trace_strings.size(); ++i) {
(*os) << "\t" << trace_strings[i] << "\n";
}
}
} // namespace debug
} // namespace base
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