1af4217925
The C++ templates were hard to understand and modify. Instead of using the templates, let's monomorphize by hand and generate equivalent classes for each FFI function signature. I tried a slightly different approach for the template code. . In the template struct itself, we now generate some simple Rust structs with all the data the templates need. I like this because it's easier to compute these values in Rust than in an Aksama template. Differential Revision: https://phabricator.services.mozilla.com/D212342
152 lines
5.7 KiB
C++
152 lines
5.7 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 <inttypes.h>
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#include "nsError.h"
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#include "nsString.h"
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#include "nsPrintfCString.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/UniquePtr.h"
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#include "mozilla/dom/UniFFICall.h"
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#include "mozilla/dom/UniFFICallbacks.h"
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#include "mozilla/dom/UniFFIScaffolding.h"
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// This file implements the UniFFI WebIDL interface by leveraging the generate
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// code in UniFFIScaffolding.cpp and UniFFIFixtureScaffolding.cpp. It's main
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// purpose is to check if MOZ_UNIFFI_FIXTURES is set and only try calling the
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// scaffolding code if it is.
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using mozilla::dom::ArrayBuffer;
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using mozilla::dom::GlobalObject;
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using mozilla::dom::Promise;
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using mozilla::dom::RootedDictionary;
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using mozilla::dom::Sequence;
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using mozilla::dom::UniFFICallbackHandler;
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using mozilla::dom::UniFFIPointer;
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using mozilla::dom::UniFFIScaffoldingCallResult;
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using mozilla::dom::UniFFIScaffoldingValue;
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using mozilla::uniffi::UniffiHandlerBase;
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namespace mozilla::uniffi {
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// Prototypes for the generated functions
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UniquePtr<UniffiHandlerBase> UniFFIGetHandler(uint64_t aId);
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Maybe<already_AddRefed<UniFFIPointer>> UniFFIReadPointer(
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const GlobalObject& aGlobal, uint64_t aId, const ArrayBuffer& aArrayBuff,
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long aPosition, ErrorResult& aError);
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bool UniFFIWritePointer(const GlobalObject& aGlobal, uint64_t aId,
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const UniFFIPointer& aPtr,
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const ArrayBuffer& aArrayBuff, long aPosition,
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ErrorResult& aError);
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#ifdef MOZ_UNIFFI_FIXTURES
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UniquePtr<UniffiHandlerBase> UniFFIFixturesGetHandler(uint64_t aId);
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Maybe<already_AddRefed<UniFFIPointer>> UniFFIFixturesReadPointer(
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const GlobalObject& aGlobal, uint64_t aId, const ArrayBuffer& aArrayBuff,
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long aPosition, ErrorResult& aError);
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bool UniFFIFixturesWritePointer(const GlobalObject& aGlobal, uint64_t aId,
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const UniFFIPointer& aPtr,
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const ArrayBuffer& aArrayBuff, long aPosition,
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ErrorResult& aError);
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#endif
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// Helper function to access both `UniFFIGetHandler` and
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// `UniFFIFixturesGetHandler` if supported.
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static UniquePtr<UniffiHandlerBase> GetHandlerHelper(uint64_t aId) {
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UniquePtr<UniffiHandlerBase> handler = uniffi::UniFFIGetHandler(aId);
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#ifdef MOZ_UNIFFI_FIXTURES
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if (!handler) {
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handler = uniffi::UniFFIFixturesGetHandler(aId);
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}
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#endif
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return handler;
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}
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} // namespace mozilla::uniffi
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namespace mozilla::dom {
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// Implement the interface using the generated functions
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already_AddRefed<Promise> UniFFIScaffolding::CallAsync(
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const GlobalObject& aGlobal, uint64_t aId,
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const Sequence<UniFFIScaffoldingValue>& aArgs, ErrorResult& aError) {
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if (UniquePtr<UniffiHandlerBase> handler = uniffi::GetHandlerHelper(aId)) {
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return UniffiHandlerBase::CallAsync(std::move(handler), aGlobal, aArgs,
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aError);
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}
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aError.ThrowUnknownError(
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nsPrintfCString("Unknown function id: %" PRIu64, aId));
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return nullptr;
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}
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void UniFFIScaffolding::CallSync(
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const GlobalObject& aGlobal, uint64_t aId,
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const Sequence<UniFFIScaffoldingValue>& aArgs,
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RootedDictionary<UniFFIScaffoldingCallResult>& aReturnValue,
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ErrorResult& aError) {
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if (UniquePtr<UniffiHandlerBase> handler = uniffi::GetHandlerHelper(aId)) {
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return UniffiHandlerBase::CallSync(std::move(handler), aGlobal, aArgs,
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aReturnValue, aError);
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}
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aError.ThrowUnknownError(
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nsPrintfCString("Unknown function id: %" PRIu64, aId));
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}
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already_AddRefed<UniFFIPointer> UniFFIScaffolding::ReadPointer(
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const GlobalObject& aGlobal, uint64_t aId, const ArrayBuffer& aArrayBuff,
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long aPosition, ErrorResult& aError) {
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Maybe<already_AddRefed<UniFFIPointer>> firstTry =
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uniffi::UniFFIReadPointer(aGlobal, aId, aArrayBuff, aPosition, aError);
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if (firstTry.isSome()) {
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return firstTry.extract();
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}
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#ifdef MOZ_UNIFFI_FIXTURES
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Maybe<already_AddRefed<UniFFIPointer>> secondTry =
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uniffi::UniFFIFixturesReadPointer(aGlobal, aId, aArrayBuff, aPosition,
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aError);
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if (secondTry.isSome()) {
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return secondTry.extract();
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}
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#endif
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aError.ThrowUnknownError(nsPrintfCString("Unknown object id: %" PRIu64, aId));
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return nullptr;
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}
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void UniFFIScaffolding::WritePointer(const GlobalObject& aGlobal, uint64_t aId,
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const UniFFIPointer& aPtr,
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const ArrayBuffer& aArrayBuff,
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long aPosition, ErrorResult& aError) {
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if (uniffi::UniFFIWritePointer(aGlobal, aId, aPtr, aArrayBuff, aPosition,
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aError)) {
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return;
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}
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#ifdef MOZ_UNIFFI_FIXTURES
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if (uniffi::UniFFIFixturesWritePointer(aGlobal, aId, aPtr, aArrayBuff,
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aPosition, aError)) {
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return;
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}
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#endif
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aError.ThrowUnknownError(nsPrintfCString("Unknown object id: %" PRIu64, aId));
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}
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void UniFFIScaffolding::RegisterCallbackHandler(
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GlobalObject& aGlobal, uint64_t aInterfaceId,
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UniFFICallbackHandler& aCallbackHandler, ErrorResult& aError) {
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uniffi::RegisterCallbackHandler(aInterfaceId, aCallbackHandler, aError);
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}
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void UniFFIScaffolding::DeregisterCallbackHandler(GlobalObject& aGlobal,
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uint64_t aInterfaceId,
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ErrorResult& aError) {
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uniffi::DeregisterCallbackHandler(aInterfaceId, aError);
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}
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} // namespace mozilla::dom
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