зеркало из https://github.com/mozilla/gecko-dev.git
Backed out changeset 75b28187fa5e (bug 1361900)
This commit is contained in:
Sebastian Hengst
Родитель
68e5b1d383
Коммит
b5071f569a
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@ -31,16 +31,14 @@ ScriptCacheChild::Init(const Maybe<FileDescriptor>& cacheFile, bool wantCacheDat
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// Finalize the script cache for the content process, and send back data about
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// any scripts executed up to this point.
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void
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ScriptCacheChild::SendScriptsAndFinalize(ScriptPreloader::ScriptHash& scripts)
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ScriptCacheChild::Finalize(LinkedList<ScriptPreloader::CachedScript>& scripts)
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{
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MOZ_ASSERT(mWantCacheData);
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AutoSafeJSAPI jsapi;
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auto matcher = ScriptPreloader::Match<ScriptPreloader::ScriptStatus::Saved>();
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nsTArray<ScriptData> dataArray;
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for (auto& script : IterHash(scripts, matcher)) {
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for (auto script : scripts) {
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if (!script->mSize && !script->XDREncode(jsapi.cx())) {
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continue;
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}
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@ -49,7 +49,7 @@ public:
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protected:
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virtual void ActorDestroy(ActorDestroyReason aWhy) override;
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void SendScriptsAndFinalize(ScriptPreloader::ScriptHash& scripts);
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void Finalize(LinkedList<ScriptPreloader::CachedScript>& scripts);
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private:
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bool mWantCacheData = false;
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@ -208,105 +208,6 @@ public:
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size_t cursor_ = 0;
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};
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template <typename T> struct Matcher;
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// Wraps the iterator for a nsTHashTable so that it may be used as a range
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// iterator. Each iterator result acts as a smart pointer to the hash element,
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// and has a Remove() method which will remove the element from the hash.
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//
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// It also accepts an optional Matcher instance against which to filter the
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// elements which should be iterated over.
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//
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// Example:
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//
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// for (auto& elem : HashElemIter<HashType>(hash)) {
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// if (elem->IsDead()) {
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// elem.Remove();
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// }
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// }
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template <typename T>
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class HashElemIter
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{
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using Iterator = typename T::Iterator;
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using ElemType = typename T::UserDataType;
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T& hash_;
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Matcher<ElemType>* matcher_;
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Maybe<Iterator> iter_;
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public:
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explicit HashElemIter(T& hash, Matcher<ElemType>* matcher = nullptr)
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: hash_(hash), matcher_(matcher)
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{
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iter_.emplace(Move(hash.Iter()));
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}
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class Elem
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{
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friend class HashElemIter<T>;
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HashElemIter<T>& iter_;
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bool done_;
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Elem(HashElemIter& iter, bool done)
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: iter_(iter), done_(done)
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{}
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Iterator& iter() { return iter_.iter_.ref(); }
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public:
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Elem& operator*() { return *this; }
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ElemType get() { return done_ ? nullptr : iter().Data(); }
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ElemType operator->() { return get(); }
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operator ElemType() { return get(); }
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void Remove() { iter().Remove(); }
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Elem& operator++()
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{
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MOZ_ASSERT(!done_);
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do {
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iter().Next();
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done_ = iter().Done();
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} while (!done_ && iter_.matcher_ && !iter_.matcher_->Matches(get()));
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return *this;
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}
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bool operator!=(Elem& other)
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{
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return done_ != other.done_ || this->get() != other.get();
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}
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};
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Elem begin() { return Elem(*this, iter_->Done()); }
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Elem end() { return Elem(*this, true); }
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};
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template <typename T>
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HashElemIter<T> IterHash(T& hash, Matcher<typename T::UserDataType>* matcher = nullptr)
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{
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return HashElemIter<T>(hash, matcher);
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}
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template <typename T, typename F>
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bool
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Find(T&& iter, F&& match)
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{
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for (auto& elem : iter) {
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if (match(elem)) {
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return true;
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}
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}
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return false;
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}
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}; // namespace loader
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}; // namespace mozilla
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@ -12,7 +12,6 @@
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#include "mozilla/ClearOnShutdown.h"
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#include "mozilla/FileUtils.h"
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#include "mozilla/Logging.h"
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#include "mozilla/ScopeExit.h"
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#include "mozilla/Services.h"
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#include "mozilla/Unused.h"
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#include "mozilla/dom/ContentChild.h"
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@ -56,13 +55,13 @@ ScriptPreloader::CollectReports(nsIHandleReportCallback* aHandleReport,
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{
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MOZ_COLLECT_REPORT(
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"explicit/script-preloader/heap/saved-scripts", KIND_HEAP, UNITS_BYTES,
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SizeOfHashEntries<ScriptStatus::Saved>(mScripts, MallocSizeOf),
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SizeOfLinkedList(mSavedScripts, MallocSizeOf),
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"Memory used to hold the scripts which have been executed in this "
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"session, and will be written to the startup script cache file.");
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MOZ_COLLECT_REPORT(
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"explicit/script-preloader/heap/restored-scripts", KIND_HEAP, UNITS_BYTES,
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SizeOfHashEntries<ScriptStatus::Restored>(mScripts, MallocSizeOf),
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SizeOfLinkedList(mRestoredScripts, MallocSizeOf),
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"Memory used to hold the scripts which have been restored from the "
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"startup script cache file, but have not been executed in this session.");
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@ -195,7 +194,11 @@ TraceOp(JSTracer* trc, void* data)
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void
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ScriptPreloader::Trace(JSTracer* trc)
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{
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for (auto& script : IterHash(mScripts)) {
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for (auto script : mSavedScripts) {
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JS::TraceEdge(trc, &script->mScript, "ScriptPreloader::CachedScript.mScript");
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}
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for (auto script : mRestoredScripts) {
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JS::TraceEdge(trc, &script->mScript, "ScriptPreloader::CachedScript.mScript");
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}
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}
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@ -256,7 +259,8 @@ ScriptPreloader::Cleanup()
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}
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}
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mScripts.Clear();
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mSavedScripts.clear();
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mRestoredScripts.clear();
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AutoSafeJSAPI jsapi;
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JS_RemoveExtraGCRootsTracer(jsapi.cx(), TraceOp, this);
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@ -265,19 +269,30 @@ ScriptPreloader::Cleanup()
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}
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void
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ScriptPreloader::FlushCache()
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ScriptPreloader::FlushScripts(LinkedList<CachedScript>& scripts)
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{
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MonitorAutoLock mal(mMonitor);
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for (auto next = scripts.getFirst(); next; ) {
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auto script = next;
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next = script->getNext();
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for (auto& script : IterHash(mScripts)) {
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// We can only purge finished scripts here. Async scripts that are
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// still being parsed off-thread have a non-refcounted reference to
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// this script, which needs to stay alive until they finish parsing.
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if (script->mReadyToExecute) {
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script->Cancel();
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script.Remove();
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script->remove();
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delete script;
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}
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}
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}
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void
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ScriptPreloader::FlushCache()
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{
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MonitorAutoLock mal(mMonitor);
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FlushScripts(mSavedScripts);
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FlushScripts(mRestoredScripts);
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// If we've already finished saving the cache at this point, start a new
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// delayed save operation. This will write out an empty cache file in place
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@ -315,7 +330,7 @@ ScriptPreloader::Observe(nsISupports* subject, const char* topic, const char16_t
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mStartupFinished = true;
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if (mChildActor) {
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mChildActor->SendScriptsAndFinalize(mScripts);
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mChildActor->Finalize(mSavedScripts);
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}
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} else if (!strcmp(topic, SHUTDOWN_TOPIC)) {
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ForceWriteCacheFile();
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@ -434,9 +449,7 @@ ScriptPreloader::InitCacheInternal()
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}
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{
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auto cleanup = MakeScopeExit([&] () {
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mScripts.Clear();
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});
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AutoCleanLinkedList<CachedScript> scripts;
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Range<uint8_t> header(data, data + headerSize);
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data += headerSize;
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@ -461,14 +474,17 @@ ScriptPreloader::InitCacheInternal()
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script->mXDRRange.emplace(scriptData, scriptData + script->mSize);
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mScripts.Put(script->mCachePath, script.release());
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scripts.insertBack(script.release());
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}
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if (buf.error()) {
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return Err(NS_ERROR_UNEXPECTED);
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}
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cleanup.release();
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for (auto script : scripts) {
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mScripts.Put(script->mCachePath, script);
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}
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mRestoredScripts = Move(scripts);
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}
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AutoJSAPI jsapi;
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@ -479,8 +495,7 @@ ScriptPreloader::InitCacheInternal()
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LOG(Info, "Off-thread decoding scripts...\n");
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JS::CompileOptions options(cx, JSVERSION_LATEST);
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for (auto& script : IterHash(mScripts, Match<ScriptStatus::Restored>())) {
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for (auto script : mRestoredScripts) {
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// Only async decode scripts which have been used in this process type.
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if (script->mProcessTypes.contains(CurrentProcessType()) &&
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script->AsyncDecodable() &&
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@ -521,25 +536,35 @@ ScriptPreloader::PrepareCacheWrite()
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return;
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}
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bool found = Find(IterHash(mScripts), [] (CachedScript* script) {
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return (script->mStatus == ScriptStatus::Restored ||
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!script->HasRange() || script->HasArray());
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});
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if (!found) {
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mSaveComplete = true;
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return;
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if (mRestoredScripts.isEmpty()) {
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// Check for any new scripts that we need to save. If there aren't
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// any, and there aren't any saved scripts that we need to remove,
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// don't bother writing out a new cache file.
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bool found = false;
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for (auto script : mSavedScripts) {
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if (!script->HasRange() || script->HasArray()) {
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found = true;
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break;
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}
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}
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if (!found) {
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mSaveComplete = true;
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return;
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}
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}
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AutoSafeJSAPI jsapi;
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for (auto& script : IterHash(mScripts, Match<ScriptStatus::Saved>())) {
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for (CachedScript* next = mSavedScripts.getFirst(); next; ) {
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CachedScript* script = next;
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next = script->getNext();
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// Don't write any scripts that are also in the child cache. They'll be
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// loaded from the child cache in that case, so there's no need to write
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// them twice.
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CachedScript* childScript = mChildCache ? mChildCache->mScripts.Get(script->mCachePath) : nullptr;
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if (childScript) {
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if (childScript->mStatus == ScriptStatus::Saved) {
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if (FindScript(mChildCache->mSavedScripts, script->mCachePath)) {
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childScript->UpdateLoadTime(script->mLoadTime);
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childScript->mProcessTypes += script->mProcessTypes;
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} else {
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@ -548,7 +573,8 @@ ScriptPreloader::PrepareCacheWrite()
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}
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if (childScript || (!script->mSize && !script->XDREncode(jsapi.cx()))) {
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script.Remove();
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script->remove();
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delete script;
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} else {
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script->mSize = script->Range().length();
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}
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@ -603,7 +629,7 @@ ScriptPreloader::WriteCache()
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NS_TRY(cacheFile->OpenNSPRFileDesc(PR_WRONLY | PR_CREATE_FILE, 0644, &fd.rwget()));
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nsTArray<CachedScript*> scripts;
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for (auto& script : IterHash(mScripts, Match<ScriptStatus::Saved>())) {
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for (auto script : mSavedScripts) {
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scripts.AppendElement(script);
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}
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@ -664,6 +690,17 @@ ScriptPreloader::Run()
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return NS_OK;
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}
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/* static */ ScriptPreloader::CachedScript*
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ScriptPreloader::FindScript(LinkedList<CachedScript>& scripts, const nsCString& cachePath)
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{
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for (auto script : scripts) {
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if (script->mCachePath == cachePath) {
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return script;
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}
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}
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return nullptr;
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}
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void
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ScriptPreloader::NoteScript(const nsCString& url, const nsCString& cachePath,
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JS::HandleScript jsscript)
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@ -680,14 +717,22 @@ ScriptPreloader::NoteScript(const nsCString& url, const nsCString& cachePath,
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return;
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}
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auto script = mScripts.LookupOrAdd(cachePath, *this, url, cachePath, jsscript);
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CachedScript* script = mScripts.Get(cachePath);
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bool restored = script && FindScript(mRestoredScripts, cachePath);
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if (script->mStatus == ScriptStatus::Restored) {
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script->mStatus = ScriptStatus::Saved;
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if (restored) {
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script->remove();
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mSavedScripts.insertBack(script);
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MOZ_ASSERT(jsscript);
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script->mScript = jsscript;
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script->mReadyToExecute = true;
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} else if (!script) {
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script = new CachedScript(*this, url, cachePath, jsscript);
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mSavedScripts.insertBack(script);
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mScripts.Put(cachePath, script);
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} else {
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return;
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}
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script->UpdateLoadTime(TimeStamp::Now());
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@ -699,13 +744,21 @@ ScriptPreloader::NoteScript(const nsCString& url, const nsCString& cachePath,
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ProcessType processType, nsTArray<uint8_t>&& xdrData,
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TimeStamp loadTime)
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{
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auto script = mScripts.LookupOrAdd(cachePath, *this, url, cachePath, nullptr);
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CachedScript* script = mScripts.Get(cachePath);
|
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bool restored = script && FindScript(mRestoredScripts, cachePath);
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if (script->mStatus == ScriptStatus::Restored) {
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script->mStatus = ScriptStatus::Saved;
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if (restored) {
|
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script->remove();
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mSavedScripts.insertBack(script);
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|
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script->mReadyToExecute = true;
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} else {
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if (!script) {
|
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script = new CachedScript(this, url, cachePath, nullptr);
|
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mSavedScripts.insertBack(script);
|
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mScripts.Put(cachePath, script);
|
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}
|
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|
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if (!script->HasRange()) {
|
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MOZ_ASSERT(!script->HasArray());
|
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@ -816,7 +869,6 @@ ScriptPreloader::OffThreadDecodeCallback(void* token, void* context)
|
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|
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ScriptPreloader::CachedScript::CachedScript(ScriptPreloader& cache, InputBuffer& buf)
|
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: mCache(cache)
|
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, mStatus(ScriptStatus::Restored)
|
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{
|
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Code(buf);
|
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}
|
||||
|
|
|
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@ -17,7 +17,7 @@
|
|||
#include "mozilla/Vector.h"
|
||||
#include "mozilla/Result.h"
|
||||
#include "mozilla/loader/AutoMemMap.h"
|
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#include "nsClassHashtable.h"
|
||||
#include "nsDataHashtable.h"
|
||||
#include "nsIFile.h"
|
||||
#include "nsIMemoryReporter.h"
|
||||
#include "nsIObserver.h"
|
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|
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@ -43,12 +43,6 @@ namespace loader {
|
|||
Web,
|
||||
Extension,
|
||||
};
|
||||
|
||||
template <typename T>
|
||||
struct Matcher
|
||||
{
|
||||
virtual bool Matches(T) = 0;
|
||||
};
|
||||
}
|
||||
|
||||
using namespace mozilla::loader;
|
||||
|
|
@ -107,11 +101,6 @@ protected:
|
|||
virtual ~ScriptPreloader() = default;
|
||||
|
||||
private:
|
||||
enum class ScriptStatus {
|
||||
Restored,
|
||||
Saved,
|
||||
};
|
||||
|
||||
// Represents a cached JS script, either initially read from the script
|
||||
// cache file, to be added to the next session's script cache file, or
|
||||
// both.
|
||||
|
|
@ -136,7 +125,7 @@ private:
|
|||
// the next session's cache file. If it was compiled in this session, its
|
||||
// mXDRRange will initially be empty, and its mXDRData buffer will be
|
||||
// populated just before it is written to the cache file.
|
||||
class CachedScript
|
||||
class CachedScript : public LinkedListElement<CachedScript>
|
||||
{
|
||||
public:
|
||||
CachedScript(CachedScript&&) = default;
|
||||
|
|
@ -145,14 +134,20 @@ private:
|
|||
: mCache(cache)
|
||||
, mURL(url)
|
||||
, mCachePath(cachePath)
|
||||
, mStatus(ScriptStatus::Saved)
|
||||
, mScript(script)
|
||||
, mReadyToExecute(true)
|
||||
{}
|
||||
|
||||
inline CachedScript(ScriptPreloader& cache, InputBuffer& buf);
|
||||
|
||||
~CachedScript() = default;
|
||||
~CachedScript()
|
||||
{
|
||||
#ifdef DEBUG
|
||||
auto hashValue = mCache->mScripts.Get(mCachePath);
|
||||
MOZ_ASSERT_IF(hashValue, hashValue == this);
|
||||
#endif
|
||||
mCache->mScripts.Remove(mCachePath);
|
||||
}
|
||||
|
||||
// For use with nsTArray::Sort.
|
||||
//
|
||||
|
|
@ -181,18 +176,6 @@ private:
|
|||
}
|
||||
};
|
||||
|
||||
struct StatusMatcher final : public Matcher<CachedScript*>
|
||||
{
|
||||
StatusMatcher(ScriptStatus status) : mStatus(status) {}
|
||||
|
||||
virtual bool Matches(CachedScript* script)
|
||||
{
|
||||
return script->mStatus == mStatus;
|
||||
}
|
||||
|
||||
const ScriptStatus mStatus;
|
||||
};
|
||||
|
||||
void Cancel();
|
||||
|
||||
void FreeData()
|
||||
|
|
@ -291,8 +274,6 @@ private:
|
|||
// The size of this script's encoded XDR data.
|
||||
uint32_t mSize = 0;
|
||||
|
||||
ScriptStatus mStatus;
|
||||
|
||||
TimeStamp mLoadTime{};
|
||||
|
||||
JS::Heap<JSScript*> mScript;
|
||||
|
|
@ -320,13 +301,6 @@ private:
|
|||
MaybeOneOf<JS::TranscodeBuffer, nsTArray<uint8_t>> mXDRData;
|
||||
};
|
||||
|
||||
template <ScriptStatus status>
|
||||
static Matcher<CachedScript*>* Match()
|
||||
{
|
||||
static CachedScript::StatusMatcher matcher{status};
|
||||
return &matcher;
|
||||
}
|
||||
|
||||
// There's a trade-off between the time it takes to setup an off-thread
|
||||
// decode and the time we save by doing the decode off-thread. At this
|
||||
// point, the setup is quite expensive, and 20K is about where we start to
|
||||
|
|
@ -350,6 +324,7 @@ private:
|
|||
void Cleanup();
|
||||
|
||||
void FlushCache();
|
||||
void FlushScripts(LinkedList<CachedScript>& scripts);
|
||||
|
||||
// Opens the cache file for reading.
|
||||
Result<Ok, nsresult> OpenCache();
|
||||
|
|
@ -366,6 +341,8 @@ private:
|
|||
Result<nsCOMPtr<nsIFile>, nsresult>
|
||||
GetCacheFile(const nsAString& suffix);
|
||||
|
||||
static CachedScript* FindScript(LinkedList<CachedScript>& scripts, const nsCString& cachePath);
|
||||
|
||||
// Waits for the given cached script to finish compiling off-thread, or
|
||||
// decodes it synchronously on the main thread, as appropriate.
|
||||
JSScript* WaitForCachedScript(JSContext* cx, CachedScript* script);
|
||||
|
|
@ -382,19 +359,26 @@ private:
|
|||
mallocSizeOf(mSaveThread.get()) + mallocSizeOf(mProfD.get()));
|
||||
}
|
||||
|
||||
using ScriptHash = nsClassHashtable<nsCStringHashKey, CachedScript>;
|
||||
|
||||
template<ScriptStatus status>
|
||||
static size_t SizeOfHashEntries(ScriptHash& scripts, mozilla::MallocSizeOf mallocSizeOf)
|
||||
template<typename T>
|
||||
static size_t SizeOfLinkedList(LinkedList<T>& list, mozilla::MallocSizeOf mallocSizeOf)
|
||||
{
|
||||
size_t size = 0;
|
||||
for (auto elem : IterHash(scripts, Match<status>())) {
|
||||
for (auto elem : list) {
|
||||
size += elem->HeapSizeOfIncludingThis(mallocSizeOf);
|
||||
}
|
||||
return size;
|
||||
}
|
||||
|
||||
ScriptHash mScripts;
|
||||
// The list of scripts executed during this session, and being saved for
|
||||
// potential reuse, and to be written to the next session's cache file.
|
||||
AutoCleanLinkedList<CachedScript> mSavedScripts;
|
||||
|
||||
// The list of scripts restored from the cache file at the start of this
|
||||
// session. Scripts are removed from this list and moved to mSavedScripts
|
||||
// the first time they're used during this session.
|
||||
AutoCleanLinkedList<CachedScript> mRestoredScripts;
|
||||
|
||||
nsDataHashtable<nsCStringHashKey, CachedScript*> mScripts;
|
||||
|
||||
// True after we've shown the first window, and are no longer adding new
|
||||
// scripts to the cache.
|
||||
|
|
|
|||
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