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// Copyright 2020 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <cxxabi.h>
#include <execinfo.h>
#include <algorithm>
#include <cstring>
#include "absl/base/internal/raw_logging.h"
#include "absl/debugging/internal/demangle.h"
#include "absl/strings/numbers.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/string_view.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
void InitializeSymbolizer(const char*) {}
namespace debugging_internal {
namespace {
static std::string GetSymbolString(absl::string_view backtrace_line) {
// Example Backtrace lines:
// 0 libimaging_shared.dylib 0x018c152a
// _ZNSt11_Deque_baseIN3nik7mediadb4PageESaIS2_EE17_M_initialize_mapEm + 3478
//
// or
// 0 libimaging_shared.dylib 0x0000000001895c39
// _ZN3nik4util19register_shared_ptrINS_3gpu7TextureEEEvPKvS5_ + 39
//
// or
// 0 mysterious_app 0x0124000120120009 main + 17
auto address_pos = backtrace_line.find(" 0x");
if (address_pos == absl::string_view::npos) return std::string();
absl::string_view symbol_view = backtrace_line.substr(address_pos + 1);
auto space_pos = symbol_view.find(" ");
if (space_pos == absl::string_view::npos) return std::string();
symbol_view = symbol_view.substr(space_pos + 1); // to mangled symbol
auto plus_pos = symbol_view.find(" + ");
if (plus_pos == absl::string_view::npos) return std::string();
symbol_view = symbol_view.substr(0, plus_pos); // strip remainng
return std::string(symbol_view);
}
} // namespace
} // namespace debugging_internal
bool Symbolize(const void* pc, char* out, int out_size) {
if (out_size <= 0 || pc == nullptr) {
out = nullptr;
return false;
}
// This allocates a char* array.
char** frame_strings = backtrace_symbols(const_cast<void**>(&pc), 1);
if (frame_strings == nullptr) return false;
std::string symbol = debugging_internal::GetSymbolString(frame_strings[0]);
free(frame_strings);
char tmp_buf[1024];
if (debugging_internal::Demangle(symbol.c_str(), tmp_buf, sizeof(tmp_buf))) {
size_t len = strlen(tmp_buf);
if (len + 1 <= static_cast<size_t>(out_size)) { // +1 for '\0'
assert(len < sizeof(tmp_buf));
memmove(out, tmp_buf, len + 1);
}
} else {
strncpy(out, symbol.c_str(), out_size);
}
if (out[out_size - 1] != '\0') {
// strncpy() does not '\0' terminate when it truncates.
static constexpr char kEllipsis[] = "...";
int ellipsis_size = std::min<int>(sizeof(kEllipsis) - 1, out_size - 1);
memcpy(out + out_size - ellipsis_size - 1, kEllipsis, ellipsis_size);
out[out_size - 1] = '\0';
}
return true;
}
ABSL_NAMESPACE_END
} // namespace absl
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