зеркало из https://github.com/mozilla/gecko-dev.git
113 строки
4.0 KiB
C++
113 строки
4.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsPrintfCString.h"
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#include "mozilla/EndianUtils.h"
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#include "mozilla/dom/UniFFIPointer.h"
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#include "mozilla/dom/UniFFIBinding.h"
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#include "mozilla/Logging.h"
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#include "UniFFIRust.h"
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static mozilla::LazyLogModule sUniFFIPointerLogger("uniffi_logger");
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namespace mozilla::dom {
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using uniffi::RUST_CALL_SUCCESS;
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using uniffi::RustCallStatus;
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using uniffi::UniFFIPointerType;
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NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(UniFFIPointer)
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NS_IMPL_CYCLE_COLLECTING_ADDREF(UniFFIPointer)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(UniFFIPointer)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(UniFFIPointer)
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NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END
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// Static function
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already_AddRefed<UniFFIPointer> UniFFIPointer::Create(
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void* aPtr, const UniFFIPointerType* aType) {
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RefPtr<UniFFIPointer> uniFFIPointer = new UniFFIPointer(aPtr, aType);
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return uniFFIPointer.forget();
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}
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already_AddRefed<UniFFIPointer> UniFFIPointer::Read(
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const ArrayBuffer& aArrayBuff, uint32_t aPosition,
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const UniFFIPointerType* aType, ErrorResult& aError) {
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MOZ_LOG(sUniFFIPointerLogger, LogLevel::Info,
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("[UniFFI] Reading Pointer from buffer"));
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aArrayBuff.ComputeState();
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CheckedUint32 position = aPosition;
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CheckedUint32 end = position + 8;
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if (!end.isValid() || end.value() > aArrayBuff.Length()) {
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aError.ThrowRangeError("position is out of range");
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return nullptr;
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}
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// in Rust and Write(), a pointer is converted to a void* then written as u64
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// BigEndian we do the reverse here
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uint8_t* data_ptr = aArrayBuff.Data() +
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aPosition; // Pointer arithmetic, move by position bytes
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void* ptr = (void*)mozilla::BigEndian::readUint64(data_ptr);
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return UniFFIPointer::Create(ptr, aType);
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}
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void UniFFIPointer::Write(const ArrayBuffer& aArrayBuff, uint32_t aPosition,
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const UniFFIPointerType* aType,
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ErrorResult& aError) const {
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if (!this->IsSamePtrType(aType)) {
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aError.ThrowUnknownError(nsPrintfCString(
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"Attempt to write pointer with wrong type: %s (expected: %s)",
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aType->typeName.get(), this->mType->typeName.get()));
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return;
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}
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MOZ_LOG(sUniFFIPointerLogger, LogLevel::Info,
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("[UniFFI] Writing Pointer to buffer"));
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aArrayBuff.ComputeState();
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CheckedUint32 position = aPosition;
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CheckedUint32 end = position + 8;
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if (!end.isValid() || end.value() > aArrayBuff.Length()) {
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aError.ThrowRangeError("position is out of range");
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return;
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}
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// in Rust and Read(), a u64 is read as BigEndian and then converted to a
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// pointer we do the reverse here
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uint8_t* data_ptr = aArrayBuff.Data() +
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aPosition; // Pointer arithmetic, move by position bytes
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mozilla::BigEndian::writeUint64(data_ptr, (uint64_t)GetPtr());
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}
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UniFFIPointer::UniFFIPointer(void* aPtr, const UniFFIPointerType* aType) {
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mPtr = aPtr;
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mType = aType;
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}
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JSObject* UniFFIPointer::WrapObject(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) {
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return dom::UniFFIPointer_Binding::Wrap(aCx, this, aGivenProto);
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}
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void* UniFFIPointer::GetPtr() const {
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MOZ_LOG(sUniFFIPointerLogger, LogLevel::Info,
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("[UniFFI] Getting raw pointer"));
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return this->mPtr;
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}
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bool UniFFIPointer::IsSamePtrType(const UniFFIPointerType* aType) const {
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return this->mType == aType;
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}
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UniFFIPointer::~UniFFIPointer() {
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MOZ_LOG(sUniFFIPointerLogger, LogLevel::Info,
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("[UniFFI] Destroying pointer"));
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RustCallStatus status{};
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this->mType->destructor(this->mPtr, &status);
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MOZ_DIAGNOSTIC_ASSERT(status.code == RUST_CALL_SUCCESS,
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"UniFFI destructor call returned a non-success result");
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}
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} // namespace mozilla::dom
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