Changeset 58133 in webkit for trunk/JavaScriptCore/runtime

Timestamp:

Apr 22, 2010, 5:11:37 PM (15 years ago)

Author:

[email protected]

Message:

​https://bugs.webkit.org/show_bug.cgi?id=38006
Change lifetime of JSC::IdentifierTables used by WebCores to match AtomicStringTable

Reviewed by Geoff Garen.

Presently JSC's IdentifierTables are owned by the JSGlobalData. For
JSGlobalData objects created via the API this should continue to be the case,
but for the JSGlobalData objects used by WebCore (the main thread's common
global data, and those for workers) use a IdentifierTable provided (and owned)
by wtfThreadData. This allow the lifetime of these IdentifierTable to match
those of the corresponding AtomicStringTables.

• API/APIShims.h:

(JSC::APIEntryShim::APIEntryShim):

• API/JSContextRef.cpp:

(JSContextGroupCreate):

• runtime/Collector.cpp:

(JSC::Heap::protect):
(JSC::Heap::unprotect):
(JSC::Heap::markRoots):

• runtime/JSGlobalData.cpp:

(JSC::JSGlobalData::JSGlobalData):
(JSC::JSGlobalData::~JSGlobalData):
(JSC::JSGlobalData::createContextGroup):
(JSC::JSGlobalData::create):
(JSC::JSGlobalData::sharedInstance):

• runtime/JSGlobalData.h:

(JSC::JSGlobalData::):
(JSC::JSGlobalData::isSharedInstance):

• runtime/JSLock.cpp:

(JSC::JSLock::JSLock):
(JSC::JSLock::lock):
(JSC::JSLock::unlock):
(JSC::JSLock::DropAllLocks::DropAllLocks):

• wtf/WTFThreadData.cpp:

(WTF::WTFThreadData::WTFThreadData):
(WTF::WTFThreadData::~WTFThreadData):

Location:

trunk/JavaScriptCore/runtime

Files:

• Collector.cpp (modified) (3 diffs)
• JSGlobalData.cpp (modified) (5 diffs)
• JSGlobalData.h (modified) (4 diffs)
• JSLock.cpp (modified) (3 diffs)

trunk/JavaScriptCore/runtime/Collector.cpp

@@ -973 +973 @@
 {
     ASSERT(k);
-    ASSERT(JSLock::currentThreadIsHoldingLock() || !m_globalData->isSharedInstance);
+//    ASSERT(JSLock::currentThreadIsHoldingLock() || !m_globalData->isSharedInstance());
 
     if (!k.isCell())
@@ -984 +984 @@
 {
     ASSERT(k);
-    ASSERT(JSLock::currentThreadIsHoldingLock() || !m_globalData->isSharedInstance);
+//    ASSERT(JSLock::currentThreadIsHoldingLock() || !m_globalData->isSharedInstance());
 
     if (!k.isCell())
@@ -1065 +1065 @@
 {
 #ifndef NDEBUG
-    if (m_globalData->isSharedInstance) {
+    if (m_globalData->isSharedInstance()) {
         ASSERT(JSLock::lockCount() > 0);
         ASSERT(JSLock::currentThreadIsHoldingLock());

trunk/JavaScriptCore/runtime/JSGlobalData.cpp

@@ -104 +104 @@
 }
 
-JSGlobalData::JSGlobalData(bool isShared, ThreadStackType threadStackType)
-    : isSharedInstance(isShared)
+JSGlobalData::JSGlobalData(GlobalDataType globalDataType, ThreadStackType threadStackType)
+    : globalDataType(globalDataType)
     , clientData(0)
     , arrayTable(fastNew<HashTable>(JSC::arrayTable))
@@ -129 +129 @@
     , numberStructure(JSNumberCell::createStructure(jsNull()))
 #endif
-    , identifierTable(createIdentifierTable())
+    , identifierTable(globalDataType == Default ? wtfThreadData().currentIdentifierTable() : createIdentifierTable())
     , literalTable(createLiteralTable())
     , propertyNames(new CommonIdentifiers(this))
@@ -194 +194 @@
 
     delete propertyNames;
-    deleteIdentifierTable(identifierTable);
+    if (globalDataType != Default)
+        deleteIdentifierTable(identifierTable);
     deleteLiteralTable(literalTable);
 
@@ -200 +201 @@
 }
 
-PassRefPtr<JSGlobalData> JSGlobalData::createNonDefault(ThreadStackType type)
-{
-    return adoptRef(new JSGlobalData(false, type));
+PassRefPtr<JSGlobalData> JSGlobalData::createContextGroup(ThreadStackType type)
+{
+    return adoptRef(new JSGlobalData(APIContextGroup, type));
 }
 
 PassRefPtr<JSGlobalData> JSGlobalData::create(ThreadStackType type)
 {
-    JSGlobalData* globalData = new JSGlobalData(false, type);
-    wtfThreadData().initializeIdentifierTable(globalData->identifierTable);
-    return adoptRef(globalData);
+    return adoptRef(new JSGlobalData(Default, type));
 }
 
@@ -229 +228 @@
     JSGlobalData*& instance = sharedInstanceInternal();
     if (!instance) {
-        instance = new JSGlobalData(true, ThreadStackTypeSmall);
+        instance = new JSGlobalData(APIShared, ThreadStackTypeSmall);
 #if ENABLE(JSC_MULTIPLE_THREADS)
         instance->makeUsableFromMultipleThreads();

trunk/JavaScriptCore/runtime/JSGlobalData.h

@@ -93 +93 @@
     class JSGlobalData : public RefCounted<JSGlobalData> {
     public:
+        // WebCore has a one-to-one mapping of threads to JSGlobalDatas;
+        // either create() or createLeaked() should only be called once
+        // on a thread, this is the 'default' JSGlobalData (it uses the
+        // thread's default string uniquing table from wtfThreadData).
+        // API contexts created using the new context group aware interface
+        // create APIContextGroup objects which require less locking of JSC
+        // than the old singleton APIShared JSGlobalData created for use by
+        // the original API.
+        enum GlobalDataType { Default, APIContextGroup, APIShared };
+
         struct ClientData {
             virtual ~ClientData() = 0;
         };
 
+        bool isSharedInstance() { return globalDataType == APIShared; }
         static bool sharedInstanceExists();
         static JSGlobalData& sharedInstance();
@@ -102 +113 @@
         static PassRefPtr<JSGlobalData> create(ThreadStackType);
         static PassRefPtr<JSGlobalData> createLeaked(ThreadStackType);
-        static PassRefPtr<JSGlobalData> createNonDefault(ThreadStackType);
+        static PassRefPtr<JSGlobalData> createContextGroup(ThreadStackType);
         ~JSGlobalData();
 
@@ -110 +121 @@
 #endif
 
-        bool isSharedInstance;
+        GlobalDataType globalDataType;
         ClientData* clientData;
 
@@ -206 +217 @@
         void dumpSampleData(ExecState* exec);
     private:
-        JSGlobalData(bool isShared, ThreadStackType);
+        JSGlobalData(GlobalDataType, ThreadStackType);
         static JSGlobalData*& sharedInstanceInternal();
         void createNativeThunk();

trunk/JavaScriptCore/runtime/JSLock.cpp

@@ -61 +61 @@
 
 JSLock::JSLock(ExecState* exec)
-    : m_lockBehavior(exec->globalData().isSharedInstance ? LockForReal : SilenceAssertionsOnly)
+    : m_lockBehavior(exec->globalData().isSharedInstance() ? LockForReal : SilenceAssertionsOnly)
 {
     lock(m_lockBehavior);
@@ -106 +106 @@
 void JSLock::lock(ExecState* exec)
 {
-    lock(exec->globalData().isSharedInstance ? LockForReal : SilenceAssertionsOnly);
+    lock(exec->globalData().isSharedInstance() ? LockForReal : SilenceAssertionsOnly);
 }
 
 void JSLock::unlock(ExecState* exec)
 {
-    unlock(exec->globalData().isSharedInstance ? LockForReal : SilenceAssertionsOnly);
+    unlock(exec->globalData().isSharedInstance() ? LockForReal : SilenceAssertionsOnly);
 }
 
@@ -163 +163 @@
 
 JSLock::DropAllLocks::DropAllLocks(ExecState* exec)
-    : m_lockBehavior(exec->globalData().isSharedInstance ? LockForReal : SilenceAssertionsOnly)
+    : m_lockBehavior(exec->globalData().isSharedInstance() ? LockForReal : SilenceAssertionsOnly)
 {
     pthread_once(&createJSLockCountOnce, createJSLockCount);