forked from mirrors/gecko-dev
1cf71b7095
Generate the C++ and JS code to handle UniFFI bindings. The WebIDL code is completely static and doesn't need to be generated. There's support for both synchronus and async functions, but we haven't decided the how we want this to be configured. In practice, almost all functions will need to be async, so for now we're just forcing all functions to be. The `uniffi-bindgen-gecko-js` crate builds the binary that generates the bindings. This binary needs to be fed a list of UDL files, the path of the .cpp file to generate, and the directory to generate .jsm files in (and also all of those arguments again, but for the test fixtures). This is quiet a horrible UI, but it's going to be wrapped in a mach command. The `uniffi-js` directory contains shared C++ code for `uniffi-bindgen-gecko-js`. As much as possible we tried to put the functionality here and have the generated code simply forward function calls here. Still Todo: - CallbackInterfaces - Custom and external types - Datetime and TimeInterval Differential Revision: https://phabricator.services.mozilla.com/D144472
92 lines
2.7 KiB
C++
92 lines
2.7 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 "nsString.h"
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#include "mozilla/dom/OwnedRustBuffer.h"
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namespace mozilla::uniffi {
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using dom::ArrayBuffer;
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OwnedRustBuffer::OwnedRustBuffer(const RustBuffer& aBuf) {
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mBuf = aBuf;
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MOZ_ASSERT(IsValid());
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}
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Result<OwnedRustBuffer, nsCString> OwnedRustBuffer::FromArrayBuffer(
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const ArrayBuffer& aArrayBuffer) {
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if (aArrayBuffer.Length() > INT32_MAX) {
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return Err("Input ArrayBuffer is too large"_ns);
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}
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RustCallStatus status{};
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RustBuffer buf = uniffi_rustbuffer_alloc(
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static_cast<int32_t>(aArrayBuffer.Length()), &status);
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buf.len = aArrayBuffer.Length();
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if (status.code != 0) {
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if (status.error_buf.data) {
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auto message = nsCString("uniffi_rustbuffer_alloc: ");
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message.Append(
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nsDependentCSubstring(reinterpret_cast<char*>(status.error_buf.data),
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status.error_buf.len));
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RustCallStatus status2{};
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uniffi_rustbuffer_free(status.error_buf, &status2);
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MOZ_RELEASE_ASSERT(status2.code == 0,
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"Freeing a rustbuffer should never fail");
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return Err(message);
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} else {
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return Err("Unknown error allocating rust buffer"_ns);
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}
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}
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memcpy(buf.data, aArrayBuffer.Data(), buf.len);
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return OwnedRustBuffer(buf);
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}
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OwnedRustBuffer::OwnedRustBuffer(OwnedRustBuffer&& aOther) : mBuf(aOther.mBuf) {
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aOther.mBuf = RustBuffer{0};
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}
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OwnedRustBuffer& OwnedRustBuffer::operator=(OwnedRustBuffer&& aOther) {
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if (&aOther != this) {
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FreeData();
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}
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mBuf = aOther.mBuf;
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aOther.mBuf = RustBuffer{0};
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return *this;
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}
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void OwnedRustBuffer::FreeData() {
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if (IsValid()) {
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RustCallStatus status{};
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uniffi_rustbuffer_free(mBuf, &status);
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MOZ_RELEASE_ASSERT(status.code == 0,
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"Freeing a rustbuffer should never fail");
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mBuf = {0};
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}
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}
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OwnedRustBuffer::~OwnedRustBuffer() { FreeData(); }
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RustBuffer OwnedRustBuffer::IntoRustBuffer() {
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RustBuffer rv = mBuf;
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mBuf = {};
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return rv;
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}
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JSObject* OwnedRustBuffer::IntoArrayBuffer(JSContext* cx) {
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int32_t len = mBuf.len;
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void* data = mBuf.data;
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auto userData = MakeUnique<OwnedRustBuffer>(std::move(*this));
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return JS::NewExternalArrayBuffer(cx, len, data, &ArrayBufferFreeFunc,
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userData.release());
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}
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void OwnedRustBuffer::ArrayBufferFreeFunc(void* contents, void* userData) {
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UniquePtr<OwnedRustBuffer> buf{reinterpret_cast<OwnedRustBuffer*>(userData)};
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}
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} // namespace mozilla::uniffi
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