a15fa87558refactor: use base::as_bytes() in WriteAsciiChunk() this avoids a reinterpret_cast and a static_cast
65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
// Copyright (c) 2018 GitHub, Inc.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#include "shell/common/heap_snapshot.h"
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#include "base/containers/span.h"
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#include "base/files/file.h"
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#include "base/memory/raw_ptr.h"
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#include "base/numerics/safe_conversions.h"
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#include "v8/include/v8-profiler.h"
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#include "v8/include/v8.h"
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namespace {
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class HeapSnapshotOutputStream : public v8::OutputStream {
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public:
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explicit HeapSnapshotOutputStream(base::File* file) : file_(file) {
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DCHECK(file_);
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}
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[[nodiscard]] bool IsComplete() const { return is_complete_; }
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// v8::OutputStream
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int GetChunkSize() override { return 65536; }
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void EndOfStream() override { is_complete_ = true; }
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v8::OutputStream::WriteResult WriteAsciiChunk(char* data, int size) override {
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// SAFETY: since WriteAsciiChunk() only gives us data + size, our
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// UNSAFE_BUFFERS macro call is unavoidable here. It can be removed
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// if/when v8 changes WriteAsciiChunk() to pass a v8::MemorySpan.
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const auto data_span = base::as_bytes(
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UNSAFE_BUFFERS(base::span{data, base::saturated_cast<size_t>(size)}));
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return file_->WriteAtCurrentPosAndCheck(data_span) ? kContinue : kAbort;
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}
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private:
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raw_ptr<base::File> file_ = nullptr;
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bool is_complete_ = false;
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};
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} // namespace
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namespace electron {
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bool TakeHeapSnapshot(v8::Isolate* isolate, base::File* file) {
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DCHECK(isolate);
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DCHECK(file);
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if (!file->IsValid())
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return false;
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auto* snapshot = isolate->GetHeapProfiler()->TakeHeapSnapshot();
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if (!snapshot)
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return false;
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HeapSnapshotOutputStream stream(file);
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snapshot->Serialize(&stream, v8::HeapSnapshot::kJSON);
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const_cast<v8::HeapSnapshot*>(snapshot)->Delete();
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return stream.IsComplete();
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}
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} // namespace electron
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