mirror of
https://github.com/mozilla/gecko-dev.git
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77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "mozilla/scache/StartupCache.h"
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#include "jsapi.h"
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#include "jsfriendapi.h"
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#include "js/CompileOptions.h"
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#include "js/Transcoding.h"
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#include "js/experimental/JSStencil.h"
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#include "mozilla/BasePrincipal.h"
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#include "mozilla/Span.h"
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using namespace JS;
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using namespace mozilla::scache;
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using mozilla::UniquePtr;
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static nsresult HandleTranscodeResult(JSContext* cx,
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JS::TranscodeResult result) {
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if (result == JS::TranscodeResult::Ok) {
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return NS_OK;
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}
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if (result == JS::TranscodeResult::Throw) {
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JS_ClearPendingException(cx);
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return NS_ERROR_OUT_OF_MEMORY;
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}
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MOZ_ASSERT(IsTranscodeFailureResult(result));
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return NS_ERROR_FAILURE;
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}
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nsresult ReadCachedStencil(StartupCache* cache, nsACString& cachePath,
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JSContext* cx,
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const JS::ReadOnlyDecodeOptions& options,
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JS::Stencil** stencilOut) {
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MOZ_ASSERT(options.borrowBuffer);
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MOZ_ASSERT(!options.usePinnedBytecode);
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const char* buf;
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uint32_t len;
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nsresult rv =
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cache->GetBuffer(PromiseFlatCString(cachePath).get(), &buf, &len);
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if (NS_FAILED(rv)) {
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return rv; // don't warn since NOT_AVAILABLE is an ok error
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}
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JS::TranscodeRange range(AsBytes(mozilla::Span(buf, len)));
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JS::TranscodeResult code = JS::DecodeStencil(cx, options, range, stencilOut);
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return HandleTranscodeResult(cx, code);
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}
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nsresult WriteCachedStencil(StartupCache* cache, nsACString& cachePath,
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JSContext* cx, JS::Stencil* stencil) {
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JS::TranscodeBuffer buffer;
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JS::TranscodeResult code = JS::EncodeStencil(cx, stencil, buffer);
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if (code != JS::TranscodeResult::Ok) {
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return HandleTranscodeResult(cx, code);
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}
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size_t size = buffer.length();
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if (size > UINT32_MAX) {
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return NS_ERROR_FAILURE;
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}
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// Move the vector buffer into a unique pointer buffer.
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mozilla::UniqueFreePtr<char[]> buf(
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reinterpret_cast<char*>(buffer.extractOrCopyRawBuffer()));
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nsresult rv = cache->PutBuffer(PromiseFlatCString(cachePath).get(),
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std::move(buf), size);
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return rv;
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}
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