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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 <emscripten.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"
extern "C" {
const char* emscripten_pc_get_function(const void* pc);
}
// clang-format off
EM_JS(bool, HaveOffsetConverter, (),
{ return typeof wasmOffsetConverter !== 'undefined'; });
// clang-format on
namespace absl {
ABSL_NAMESPACE_BEGIN
void InitializeSymbolizer(const char*) {
if (!HaveOffsetConverter()) {
ABSL_RAW_LOG(INFO,
"Symbolization unavailable. Rebuild with -sWASM=1 "
"and -sUSE_OFFSET_CONVERTER=1.");
}
}
bool Symbolize(const void* pc, char* out, int out_size) {
// Check if we have the offset converter necessary for pc_get_function.
// Without it, the program will abort().
if (!HaveOffsetConverter()) {
return false;
}
const char* func_name = emscripten_pc_get_function(pc);
if (func_name == nullptr) {
return false;
}
strncpy(out, func_name, 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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