forked from mirrors/gecko-dev
79 lines
2.6 KiB
C++
79 lines
2.6 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 "js/Transcoding.h"
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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 "mozilla/BasePrincipal.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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// We only serialize scripts with system principals. So we don't serialize the
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// principals when writing a script. Instead, when reading it back, we set the
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// principals to the system principals.
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nsresult ReadCachedScript(StartupCache* cache, nsACString& uri, JSContext* cx,
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const JS::ReadOnlyCompileOptions& options,
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MutableHandleScript scriptp) {
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const char* buf;
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uint32_t len;
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nsresult rv = cache->GetBuffer(PromiseFlatCString(uri).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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void* copy = malloc(len);
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if (!copy) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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memcpy(copy, buf, len);
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JS::TranscodeBuffer buffer;
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buffer.replaceRawBuffer(reinterpret_cast<uint8_t*>(copy), len);
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JS::TranscodeResult code = JS::DecodeScript(cx, options, buffer, scriptp);
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return HandleTranscodeResult(cx, code);
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}
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nsresult WriteCachedScript(StartupCache* cache, nsACString& uri, JSContext* cx,
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HandleScript script) {
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MOZ_ASSERT(
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nsJSPrincipals::get(JS_GetScriptPrincipals(script))->IsSystemPrincipal());
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JS::TranscodeBuffer buffer;
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JS::TranscodeResult code = JS::EncodeScript(cx, buffer, script);
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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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UniquePtr<char[]> buf(
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reinterpret_cast<char*>(buffer.extractOrCopyRawBuffer()));
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nsresult rv =
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cache->PutBuffer(PromiseFlatCString(uri).get(), std::move(buf), size);
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return rv;
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}
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