JavaScriptCore-621.1.tar.gz

[apple/javascriptcore.git] / API / JSContextRef.cpp

diff --git a/API/JSContextRef.cpp b/API/JSContextRef.cpp
index 203326e251f64e51f5364495abc115796e31970b..b97ceda6799a66e823379a414421239a3c4bac2c 100644 (file)
--- a/API/JSContextRef.cpp
+++ b/API/JSContextRef.cpp
@@ -1,4 +1,3 @@
-// -*- mode: c++; c-basic-offset: 4 -*-
 /*
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  *
@@ -26,51 +25,151 @@
 
 #include "config.h"
 #include "JSContextRef.h"
+#include "JSContextRefPrivate.h"
 
 #include "APICast.h"
+#include "InitializeThreading.h"
 #include "JSCallbackObject.h"
 #include "JSClassRef.h"
 #include "JSGlobalObject.h"
-#include "object.h"
-#include <wtf/Platform.h>
+#include "JSObject.h"
+#include <wtf/text/StringHash.h>
 
-using namespace KJS;
+#if OS(DARWIN)
+#include <mach-o/dyld.h>
+
+static const int32_t webkitFirstVersionWithConcurrentGlobalContexts = 0x2100500; // 528.5.0
+#endif
+
+using namespace JSC;
+
+JSContextGroupRef JSContextGroupCreate()
+{
+    initializeThreading();
+    return toRef(JSGlobalData::createContextGroup(ThreadStackTypeSmall).releaseRef());
+}
+
+JSContextGroupRef JSContextGroupRetain(JSContextGroupRef group)
+{
+    toJS(group)->ref();
+    return group;
+}
+
+void JSContextGroupRelease(JSContextGroupRef group)
+{
+    toJS(group)->deref();
+}
 
 JSGlobalContextRef JSGlobalContextCreate(JSClassRef globalObjectClass)
 {
-    JSLock lock;
+    initializeThreading();
+#if OS(DARWIN)
+    // When running on Tiger or Leopard, or if the application was linked before JSGlobalContextCreate was changed
+    // to use a unique JSGlobalData, we use a shared one for compatibility.
+#if !defined(BUILDING_ON_TIGER) && !defined(BUILDING_ON_LEOPARD)
+    if (NSVersionOfLinkTimeLibrary("JavaScriptCore") <= webkitFirstVersionWithConcurrentGlobalContexts) {
+#else
+    {
+#endif
+        JSLock lock(LockForReal);
+        return JSGlobalContextCreateInGroup(toRef(&JSGlobalData::sharedInstance()), globalObjectClass);
+    }
+#endif // OS(DARWIN)
+
+    return JSGlobalContextCreateInGroup(0, globalObjectClass);
+}
+
+JSGlobalContextRef JSGlobalContextCreateInGroup(JSContextGroupRef group, JSClassRef globalObjectClass)
+{
+    initializeThreading();
+
+    JSLock lock(LockForReal);
+    RefPtr<JSGlobalData> globalData = group ? PassRefPtr<JSGlobalData>(toJS(group)) : JSGlobalData::createContextGroup(ThreadStackTypeSmall);
+
+    APIEntryShim entryShim(globalData.get(), false);
+
+#if ENABLE(JSC_MULTIPLE_THREADS)
+    globalData->makeUsableFromMultipleThreads();
+#endif
 
     if (!globalObjectClass) {
-        JSGlobalObject* globalObject = new JSGlobalObject;
+        JSGlobalObject* globalObject = new (globalData.get()) JSGlobalObject;
         return JSGlobalContextRetain(toGlobalRef(globalObject->globalExec()));
     }
 
-    JSGlobalObject* globalObject = new JSCallbackObject<JSGlobalObject>(globalObjectClass);
-    JSGlobalContextRef ctx = toGlobalRef(globalObject->globalExec());
-    JSValue* prototype = globalObjectClass->prototype(ctx);
+    JSGlobalObject* globalObject = new (globalData.get()) JSCallbackObject<JSGlobalObject>(globalObjectClass);
+    ExecState* exec = globalObject->globalExec();
+    JSValue prototype = globalObjectClass->prototype(exec);
     if (!prototype)
         prototype = jsNull();
-    globalObject->reset(prototype);
-    return JSGlobalContextRetain(ctx);
+    globalObject->resetPrototype(prototype);
+    return JSGlobalContextRetain(toGlobalRef(exec));
 }
 
 JSGlobalContextRef JSGlobalContextRetain(JSGlobalContextRef ctx)
 {
-    JSLock lock;
     ExecState* exec = toJS(ctx);
+    APIEntryShim entryShim(exec);
+
+    JSGlobalData& globalData = exec->globalData();
     gcProtect(exec->dynamicGlobalObject());
+    globalData.ref();
     return ctx;
 }
 
 void JSGlobalContextRelease(JSGlobalContextRef ctx)
 {
-    JSLock lock;
     ExecState* exec = toJS(ctx);
-    gcUnprotect(exec->dynamicGlobalObject());
+    JSLock lock(exec);
+
+    JSGlobalData& globalData = exec->globalData();
+    JSGlobalObject* dgo = exec->dynamicGlobalObject();
+    IdentifierTable* savedIdentifierTable = wtfThreadData().setCurrentIdentifierTable(globalData.identifierTable);
+
+    // One reference is held by JSGlobalObject, another added by JSGlobalContextRetain().
+    bool releasingContextGroup = globalData.refCount() == 2;
+    bool releasingGlobalObject = Heap::heap(dgo)->unprotect(dgo);
+    // If this is the last reference to a global data, it should also
+    // be the only remaining reference to the global object too!
+    ASSERT(!releasingContextGroup || releasingGlobalObject);
+
+    // An API 'JSGlobalContextRef' retains two things - a global object and a
+    // global data (or context group, in API terminology).
+    // * If this is the last reference to any contexts in the given context group,
+    //   call destroy on the heap (the global data is being  freed).
+    // * If this was the last reference to the global object, then unprotecting
+    //   it may  release a lot of GC memory - run the garbage collector now.
+    // * If there are more references remaining the the global object, then do nothing
+    //   (specifically that is more protects, which we assume come from other JSGlobalContextRefs).
+    if (releasingContextGroup)
+        globalData.heap.destroy();
+    else if (releasingGlobalObject)
+        globalData.heap.collectAllGarbage();
+
+    globalData.deref();
+
+    wtfThreadData().setCurrentIdentifierTable(savedIdentifierTable);
 }
 
 JSObjectRef JSContextGetGlobalObject(JSContextRef ctx)
 {
     ExecState* exec = toJS(ctx);
-    return toRef(exec->dynamicGlobalObject());
+    APIEntryShim entryShim(exec);
+
+    // It is necessary to call toThisObject to get the wrapper object when used with WebCore.
+    return toRef(exec->lexicalGlobalObject()->toThisObject(exec));
+}
+
+JSContextGroupRef JSContextGetGroup(JSContextRef ctx)
+{
+    ExecState* exec = toJS(ctx);
+    return toRef(&exec->globalData());
+}
+
+JSGlobalContextRef JSContextGetGlobalContext(JSContextRef ctx)
+{
+    ExecState* exec = toJS(ctx);
+    APIEntryShim entryShim(exec);
+
+    return toGlobalRef(exec->lexicalGlobalObject()->globalExec());
 }