Abseil Common Libraries (C++) (grcp 依赖)
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72 lines
2.1 KiB
72 lines
2.1 KiB
// Copyright 2020 The Abseil Authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// https://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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#include <cxxabi.h> |
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#include <emscripten.h> |
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#include <algorithm> |
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#include <cstring> |
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#include "absl/base/internal/raw_logging.h" |
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#include "absl/debugging/internal/demangle.h" |
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#include "absl/strings/numbers.h" |
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#include "absl/strings/str_cat.h" |
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#include "absl/strings/string_view.h" |
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extern "C" { |
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const char* emscripten_pc_get_function(const void* pc); |
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} |
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// clang-format off |
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EM_JS(bool, HaveOffsetConverter, (), |
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{ return typeof wasmOffsetConverter !== 'undefined'; }); |
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// clang-format on |
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namespace absl { |
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ABSL_NAMESPACE_BEGIN |
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void InitializeSymbolizer(const char*) { |
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if (!HaveOffsetConverter()) { |
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ABSL_RAW_LOG(INFO, |
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"Symbolization unavailable. Rebuild with -sWASM=1 " |
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"and -sUSE_OFFSET_CONVERTER=1."); |
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} |
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} |
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bool Symbolize(const void* pc, char* out, int out_size) { |
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// Check if we have the offset converter necessary for pc_get_function. |
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// Without it, the program will abort(). |
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if (!HaveOffsetConverter()) { |
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return false; |
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} |
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const char* func_name = emscripten_pc_get_function(pc); |
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if (func_name == nullptr) { |
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return false; |
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} |
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strncpy(out, func_name, out_size); |
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if (out[out_size - 1] != '\0') { |
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// strncpy() does not '\0' terminate when it truncates. |
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static constexpr char kEllipsis[] = "..."; |
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int ellipsis_size = std::min<int>(sizeof(kEllipsis) - 1, out_size - 1); |
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memcpy(out + out_size - ellipsis_size - 1, kEllipsis, ellipsis_size); |
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out[out_size - 1] = '\0'; |
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} |
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return true; |
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} |
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ABSL_NAMESPACE_END |
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} // namespace absl
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