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fix: -Wunsafe-buffer-usage warning in WriteAsciiChunk() (#44134)

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* fix: -Wunsafe-buffer-usage warning in WriteAsciiChunk()

* chore: add // SAFETY comment to explain UNSAFE_BUFFERS() use
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Charles Kerr 2024-10-09 12:18:19 -05:00 committed by GitHub
parent b5227b4a17
commit dbbdf55493
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GPG key ID: B5690EEEBB952194
1 changed files with 8 additions and 2 deletions
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10
shell/common/heap_snapshot.cc
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@ -4,6 +4,7 @@
#include "shell/common/heap_snapshot.h"
#include "base/containers/span.h"
#include "base/files/file.h"
#include "base/memory/raw_ptr.h"
#include "v8/include/v8-profiler.h"
@ -24,8 +25,13 @@ class HeapSnapshotOutputStream : public v8::OutputStream {
void EndOfStream() override { is_complete_ = true; }
v8::OutputStream::WriteResult WriteAsciiChunk(char* data, int size) override {
auto bytes_written = file_->WriteAtCurrentPos(data, size);
return bytes_written == size ? kContinue : kAbort;
const uint8_t* udata = reinterpret_cast<const uint8_t*>(data);
const size_t usize = static_cast<size_t>(std::max(0, size));
// SAFETY: since WriteAsciiChunk() only gives us data + size, our
// UNSAFE_BUFFERS macro call is unavoidable here. It can be removed
// if/when v8 changes WriteAsciiChunk() to pass a v8::MemorySpan.
const auto data_span = UNSAFE_BUFFERS(base::span(udata, usize));
return file_->WriteAtCurrentPosAndCheck(data_span) ? kContinue : kAbort;
}
private: