73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
// 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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