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diff --git a/Source/JavaScriptCore/API/JSBase.cpp b/Source/JavaScriptCore/API/JSBase.cpp
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+/*
+ * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "JSBase.h"
+#include "JSBasePrivate.h"
+
+#include "APICast.h"
+#include "APIShims.h"
+#include "Completion.h"
+#include "OpaqueJSString.h"
+#include "SourceCode.h"
+#include <interpreter/CallFrame.h>
+#include <runtime/InitializeThreading.h>
+#include <runtime/Completion.h>
+#include <runtime/JSGlobalObject.h>
+#include <runtime/JSLock.h>
+#include <runtime/JSObject.h>
+#include <wtf/text/StringHash.h>
+
+using namespace JSC;
+
+JSValueRef JSEvaluateScript(JSContextRef ctx, JSStringRef script, JSObjectRef thisObject, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception)
+{
+    ExecState* exec = toJS(ctx);
+    APIEntryShim entryShim(exec);
+
+    JSObject* jsThisObject = toJS(thisObject);
+
+    // evaluate sets "this" to the global object if it is NULL
+    JSGlobalObject* globalObject = exec->dynamicGlobalObject();
+    SourceCode source = makeSource(script->ustring(), sourceURL->ustring(), startingLineNumber);
+    Completion completion = evaluate(globalObject->globalExec(), globalObject->globalScopeChain(), source, jsThisObject);
+
+    if (completion.complType() == Throw) {
+        if (exception)
+            *exception = toRef(exec, completion.value());
+        return 0;
+    }
+
+    if (completion.value())
+        return toRef(exec, completion.value());
+    
+    // happens, for example, when the only statement is an empty (';') statement
+    return toRef(exec, jsUndefined());
+}
+
+bool JSCheckScriptSyntax(JSContextRef ctx, JSStringRef script, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception)
+{
+    ExecState* exec = toJS(ctx);
+    APIEntryShim entryShim(exec);
+
+    SourceCode source = makeSource(script->ustring(), sourceURL->ustring(), startingLineNumber);
+    Completion completion = checkSyntax(exec->dynamicGlobalObject()->globalExec(), source);
+    if (completion.complType() == Throw) {
+        if (exception)
+            *exception = toRef(exec, completion.value());
+        return false;
+    }
+    
+    return true;
+}
+
+void JSGarbageCollect(JSContextRef ctx)
+{
+    // We used to recommend passing NULL as an argument here, which caused the only heap to be collected.
+    // As there is no longer a shared heap, the previously recommended usage became a no-op (but the GC
+    // will happen when the context group is destroyed).
+    // Because the function argument was originally ignored, some clients may pass their released context here,
+    // in which case there is a risk of crashing if another thread performs GC on the same heap in between.
+    if (!ctx)
+        return;
+
+    ExecState* exec = toJS(ctx);
+    APIEntryShim entryShim(exec, false);
+
+    JSGlobalData& globalData = exec->globalData();
+    if (!globalData.heap.isBusy())
+        globalData.heap.collectAllGarbage();
+
+    // FIXME: Perhaps we should trigger a second mark and sweep
+    // once the garbage collector is done if this is called when
+    // the collector is busy.
+}
+
+void JSReportExtraMemoryCost(JSContextRef ctx, size_t size)
+{
+    ExecState* exec = toJS(ctx);
+    APIEntryShim entryShim(exec);
+    exec->globalData().heap.reportExtraMemoryCost(size);
+}