--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/JavaScriptCore/runtime/JSString.h Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,632 @@
+/*
+ * Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ * Copyright (C) 2001 Peter Kelly (pmk@post.com)
+ * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef JSString_h
+#define JSString_h
+
+#include "CallFrame.h"
+#include "CommonIdentifiers.h"
+#include "Identifier.h"
+#include "JSNumberCell.h"
+#include "PropertyDescriptor.h"
+#include "PropertySlot.h"
+#include "RopeImpl.h"
+
+namespace JSC {
+
+ class JSString;
+
+ JSString* jsEmptyString(JSGlobalData*);
+ JSString* jsEmptyString(ExecState*);
+ JSString* jsString(JSGlobalData*, const UString&); // returns empty string if passed null string
+ JSString* jsString(ExecState*, const UString&); // returns empty string if passed null string
+
+ JSString* jsSingleCharacterString(JSGlobalData*, UChar);
+ JSString* jsSingleCharacterString(ExecState*, UChar);
+ JSString* jsSingleCharacterSubstring(ExecState*, const UString&, unsigned offset);
+ JSString* jsSubstring(JSGlobalData*, const UString&, unsigned offset, unsigned length);
+ JSString* jsSubstring(ExecState*, const UString&, unsigned offset, unsigned length);
+
+ // Non-trivial strings are two or more characters long.
+ // These functions are faster than just calling jsString.
+ JSString* jsNontrivialString(JSGlobalData*, const UString&);
+ JSString* jsNontrivialString(ExecState*, const UString&);
+ JSString* jsNontrivialString(JSGlobalData*, const char*);
+ JSString* jsNontrivialString(ExecState*, const char*);
+
+ // Should be used for strings that are owned by an object that will
+ // likely outlive the JSValue this makes, such as the parse tree or a
+ // DOM object that contains a UString
+ JSString* jsOwnedString(JSGlobalData*, const UString&);
+ JSString* jsOwnedString(ExecState*, const UString&);
+
+ typedef void (*JSStringFinalizerCallback)(JSString*, void* context);
+ JSString* jsStringWithFinalizer(ExecState*, const UString&, JSStringFinalizerCallback callback, void* context);
+
+ class JS_EXPORTCLASS JSString : public JSCell {
+ public:
+ friend class JIT;
+ friend class JSGlobalData;
+ friend class SpecializedThunkJIT;
+ friend struct ThunkHelpers;
+
+ class RopeBuilder {
+ public:
+ RopeBuilder(unsigned fiberCount)
+ : m_index(0)
+ , m_rope(RopeImpl::tryCreateUninitialized(fiberCount))
+ {
+ }
+
+ bool isOutOfMemory() { return !m_rope; }
+
+ void append(RopeImpl::Fiber& fiber)
+ {
+ ASSERT(m_rope);
+ m_rope->initializeFiber(m_index, fiber);
+ }
+ void append(const UString& string)
+ {
+ ASSERT(m_rope);
+ m_rope->initializeFiber(m_index, string.rep());
+ }
+ void append(JSString* jsString)
+ {
+ if (jsString->isRope()) {
+ for (unsigned i = 0; i < jsString->m_fiberCount; ++i)
+ append(jsString->m_other.m_fibers[i]);
+ } else
+ append(jsString->string());
+ }
+
+ PassRefPtr<RopeImpl> release()
+ {
+ ASSERT(m_index == m_rope->fiberCount());
+ return m_rope.release();
+ }
+
+ unsigned length() { return m_rope->length(); }
+
+ private:
+ unsigned m_index;
+ RefPtr<RopeImpl> m_rope;
+ };
+
+ class RopeIterator {
+ public:
+ RopeIterator() { }
+
+ RopeIterator(RopeImpl::Fiber* fibers, size_t fiberCount)
+ {
+ ASSERT(fiberCount);
+ m_workQueue.append(WorkItem(fibers, fiberCount));
+ skipRopes();
+ }
+
+ RopeIterator& operator++()
+ {
+ WorkItem& item = m_workQueue.last();
+ ASSERT(!RopeImpl::isRope(item.fibers[item.i]));
+ if (++item.i == item.fiberCount)
+ m_workQueue.removeLast();
+ skipRopes();
+ return *this;
+ }
+
+ UStringImpl* operator*()
+ {
+ WorkItem& item = m_workQueue.last();
+ RopeImpl::Fiber fiber = item.fibers[item.i];
+ ASSERT(!RopeImpl::isRope(fiber));
+ return static_cast<UStringImpl*>(fiber);
+ }
+
+ bool operator!=(const RopeIterator& other) const
+ {
+ return m_workQueue != other.m_workQueue;
+ }
+
+ private:
+ struct WorkItem {
+ WorkItem(RopeImpl::Fiber* fibers, size_t fiberCount)
+ : fibers(fibers)
+ , fiberCount(fiberCount)
+ , i(0)
+ {
+ }
+
+ bool operator!=(const WorkItem& other) const
+ {
+ return fibers != other.fibers || fiberCount != other.fiberCount || i != other.i;
+ }
+
+ RopeImpl::Fiber* fibers;
+ size_t fiberCount;
+ size_t i;
+ };
+
+ void skipRopes()
+ {
+ if (m_workQueue.isEmpty())
+ return;
+
+ while (1) {
+ WorkItem& item = m_workQueue.last();
+ RopeImpl::Fiber fiber = item.fibers[item.i];
+ if (!RopeImpl::isRope(fiber))
+ break;
+ RopeImpl* rope = static_cast<RopeImpl*>(fiber);
+ if (++item.i == item.fiberCount)
+ m_workQueue.removeLast();
+ m_workQueue.append(WorkItem(rope->fibers(), rope->fiberCount()));
+ }
+ }
+
+ Vector<WorkItem, 16> m_workQueue;
+ };
+
+ ALWAYS_INLINE JSString(JSGlobalData* globalData, const UString& value)
+ : JSCell(globalData->stringStructure.get())
+ , m_length(value.size())
+ , m_value(value)
+ , m_fiberCount(0)
+ {
+ ASSERT(!m_value.isNull());
+ Heap::heap(this)->reportExtraMemoryCost(value.cost());
+ }
+
+ enum HasOtherOwnerType { HasOtherOwner };
+ JSString(JSGlobalData* globalData, const UString& value, HasOtherOwnerType)
+ : JSCell(globalData->stringStructure.get())
+ , m_length(value.size())
+ , m_value(value)
+ , m_fiberCount(0)
+ {
+ ASSERT(!m_value.isNull());
+ }
+ JSString(JSGlobalData* globalData, PassRefPtr<UStringImpl> value, HasOtherOwnerType)
+ : JSCell(globalData->stringStructure.get())
+ , m_length(value->length())
+ , m_value(value)
+ , m_fiberCount(0)
+ {
+ ASSERT(!m_value.isNull());
+ }
+ JSString(JSGlobalData* globalData, PassRefPtr<RopeImpl> rope)
+ : JSCell(globalData->stringStructure.get())
+ , m_length(rope->length())
+ , m_fiberCount(1)
+ {
+ m_other.m_fibers[0] = rope.releaseRef();
+ }
+ // This constructor constructs a new string by concatenating s1 & s2.
+ // This should only be called with fiberCount <= 3.
+ JSString(JSGlobalData* globalData, unsigned fiberCount, JSString* s1, JSString* s2)
+ : JSCell(globalData->stringStructure.get())
+ , m_length(s1->length() + s2->length())
+ , m_fiberCount(fiberCount)
+ {
+ ASSERT(fiberCount <= s_maxInternalRopeLength);
+ unsigned index = 0;
+ appendStringInConstruct(index, s1);
+ appendStringInConstruct(index, s2);
+ ASSERT(fiberCount == index);
+ }
+ // This constructor constructs a new string by concatenating s1 & s2.
+ // This should only be called with fiberCount <= 3.
+ JSString(JSGlobalData* globalData, unsigned fiberCount, JSString* s1, const UString& u2)
+ : JSCell(globalData->stringStructure.get())
+ , m_length(s1->length() + u2.size())
+ , m_fiberCount(fiberCount)
+ {
+ ASSERT(fiberCount <= s_maxInternalRopeLength);
+ unsigned index = 0;
+ appendStringInConstruct(index, s1);
+ appendStringInConstruct(index, u2);
+ ASSERT(fiberCount == index);
+ }
+ // This constructor constructs a new string by concatenating s1 & s2.
+ // This should only be called with fiberCount <= 3.
+ JSString(JSGlobalData* globalData, unsigned fiberCount, const UString& u1, JSString* s2)
+ : JSCell(globalData->stringStructure.get())
+ , m_length(u1.size() + s2->length())
+ , m_fiberCount(fiberCount)
+ {
+ ASSERT(fiberCount <= s_maxInternalRopeLength);
+ unsigned index = 0;
+ appendStringInConstruct(index, u1);
+ appendStringInConstruct(index, s2);
+ ASSERT(fiberCount == index);
+ }
+ // This constructor constructs a new string by concatenating v1, v2 & v3.
+ // This should only be called with fiberCount <= 3 ... which since every
+ // value must require a fiberCount of at least one implies that the length
+ // for each value must be exactly 1!
+ JSString(ExecState* exec, JSValue v1, JSValue v2, JSValue v3)
+ : JSCell(exec->globalData().stringStructure.get())
+ , m_length(0)
+ , m_fiberCount(s_maxInternalRopeLength)
+ {
+ unsigned index = 0;
+ appendValueInConstructAndIncrementLength(exec, index, v1);
+ appendValueInConstructAndIncrementLength(exec, index, v2);
+ appendValueInConstructAndIncrementLength(exec, index, v3);
+ ASSERT(index == s_maxInternalRopeLength);
+ }
+
+ // This constructor constructs a new string by concatenating u1 & u2.
+ JSString(JSGlobalData* globalData, const UString& u1, const UString& u2)
+ : JSCell(globalData->stringStructure.get())
+ , m_length(u1.size() + u2.size())
+ , m_fiberCount(2)
+ {
+ unsigned index = 0;
+ appendStringInConstruct(index, u1);
+ appendStringInConstruct(index, u2);
+ ASSERT(index <= s_maxInternalRopeLength);
+ }
+
+ // This constructor constructs a new string by concatenating u1, u2 & u3.
+ JSString(JSGlobalData* globalData, const UString& u1, const UString& u2, const UString& u3)
+ : JSCell(globalData->stringStructure.get())
+ , m_length(u1.size() + u2.size() + u3.size())
+ , m_fiberCount(s_maxInternalRopeLength)
+ {
+ unsigned index = 0;
+ appendStringInConstruct(index, u1);
+ appendStringInConstruct(index, u2);
+ appendStringInConstruct(index, u3);
+ ASSERT(index <= s_maxInternalRopeLength);
+ }
+
+ JSString(JSGlobalData* globalData, const UString& value, JSStringFinalizerCallback finalizer, void* context)
+ : JSCell(globalData->stringStructure.get())
+ , m_length(value.size())
+ , m_value(value)
+ , m_fiberCount(0)
+ {
+ ASSERT(!m_value.isNull());
+ // nasty hack because we can't union non-POD types
+ m_other.m_finalizerCallback = finalizer;
+ m_other.m_finalizerContext = context;
+ Heap::heap(this)->reportExtraMemoryCost(value.cost());
+ }
+
+ ~JSString()
+ {
+ ASSERT(vptr() == JSGlobalData::jsStringVPtr);
+ for (unsigned i = 0; i < m_fiberCount; ++i)
+ RopeImpl::deref(m_other.m_fibers[i]);
+
+ if (!m_fiberCount && m_other.m_finalizerCallback)
+ m_other.m_finalizerCallback(this, m_other.m_finalizerContext);
+ }
+
+ const UString& value(ExecState* exec) const
+ {
+ if (isRope())
+ resolveRope(exec);
+ return m_value;
+ }
+ const UString& tryGetValue() const
+ {
+ if (isRope())
+ resolveRope(0);
+ return m_value;
+ }
+ unsigned length() { return m_length; }
+
+ bool getStringPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
+ bool getStringPropertySlot(ExecState*, unsigned propertyName, PropertySlot&);
+ bool getStringPropertyDescriptor(ExecState*, const Identifier& propertyName, PropertyDescriptor&);
+
+ bool canGetIndex(unsigned i) { return i < m_length; }
+ JSString* getIndex(ExecState*, unsigned);
+ JSString* getIndexSlowCase(ExecState*, unsigned);
+
+ JSValue replaceCharacter(ExecState*, UChar, const UString& replacement);
+
+ static PassRefPtr<Structure> createStructure(JSValue proto) { return Structure::create(proto, TypeInfo(StringType, OverridesGetOwnPropertySlot | NeedsThisConversion), AnonymousSlotCount); }
+
+ private:
+ enum VPtrStealingHackType { VPtrStealingHack };
+ JSString(VPtrStealingHackType)
+ : JSCell(0)
+ , m_fiberCount(0)
+ {
+ }
+
+ void resolveRope(ExecState*) const;
+
+ void appendStringInConstruct(unsigned& index, const UString& string)
+ {
+ UStringImpl* impl = string.rep();
+ impl->ref();
+ m_other.m_fibers[index++] = impl;
+ }
+
+ void appendStringInConstruct(unsigned& index, JSString* jsString)
+ {
+ if (jsString->isRope()) {
+ for (unsigned i = 0; i < jsString->m_fiberCount; ++i) {
+ RopeImpl::Fiber fiber = jsString->m_other.m_fibers[i];
+ fiber->ref();
+ m_other.m_fibers[index++] = fiber;
+ }
+ } else
+ appendStringInConstruct(index, jsString->string());
+ }
+
+ void appendValueInConstructAndIncrementLength(ExecState* exec, unsigned& index, JSValue v)
+ {
+ if (v.isString()) {
+ ASSERT(asCell(v)->isString());
+ JSString* s = static_cast<JSString*>(asCell(v));
+ ASSERT(s->size() == 1);
+ appendStringInConstruct(index, s);
+ m_length += s->length();
+ } else {
+ UString u(v.toString(exec));
+ UStringImpl* impl = u.rep();
+ impl->ref();
+ m_other.m_fibers[index++] = impl;
+ m_length += u.size();
+ }
+ }
+
+ virtual JSValue toPrimitive(ExecState*, PreferredPrimitiveType) const;
+ virtual bool getPrimitiveNumber(ExecState*, double& number, JSValue& value);
+ virtual bool toBoolean(ExecState*) const;
+ virtual double toNumber(ExecState*) const;
+ virtual JSObject* toObject(ExecState*) const;
+ virtual UString toString(ExecState*) const;
+
+ virtual JSObject* toThisObject(ExecState*) const;
+
+ // Actually getPropertySlot, not getOwnPropertySlot (see JSCell).
+ virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
+ virtual bool getOwnPropertySlot(ExecState*, unsigned propertyName, PropertySlot&);
+ virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&);
+
+ static const unsigned s_maxInternalRopeLength = 3;
+
+ // A string is represented either by a UString or a RopeImpl.
+ unsigned m_length;
+ mutable UString m_value;
+ mutable unsigned m_fiberCount;
+ // This structure exists to support a temporary workaround for a GC issue.
+ struct JSStringFinalizerStruct {
+ JSStringFinalizerStruct() : m_finalizerCallback(0) {}
+ union {
+ mutable FixedArray<RopeImpl::Fiber, s_maxInternalRopeLength> m_fibers;
+ struct {
+ JSStringFinalizerCallback m_finalizerCallback;
+ void* m_finalizerContext;
+ };
+ };
+ } m_other;
+
+ bool isRope() const { return m_fiberCount; }
+ UString& string() { ASSERT(!isRope()); return m_value; }
+ unsigned size() { return m_fiberCount ? m_fiberCount : 1; }
+
+ friend JSValue jsString(ExecState* exec, JSString* s1, JSString* s2);
+ friend JSValue jsString(ExecState* exec, const UString& u1, JSString* s2);
+ friend JSValue jsString(ExecState* exec, JSString* s1, const UString& u2);
+ friend JSValue jsString(ExecState* exec, Register* strings, unsigned count);
+ friend JSValue jsString(ExecState* exec, JSValue thisValue);
+ friend JSString* jsStringWithFinalizer(ExecState*, const UString&, JSStringFinalizerCallback callback, void* context);
+ };
+
+ JSString* asString(JSValue);
+
+ // When an object is created from a different DLL, MSVC changes vptr to a "local" one right after invoking a constructor,
+ // see <http://groups.google.com/group/microsoft.public.vc.language/msg/55cdcefeaf770212>.
+ // This breaks isJSString(), and we don't need that hack anyway, so we change vptr back to primary one.
+ // The below function must be called by any inline function that invokes a JSString constructor.
+#if COMPILER(MSVC) && !defined(BUILDING_JavaScriptCore)
+ inline JSString* fixupVPtr(JSGlobalData* globalData, JSString* string) { string->setVPtr(globalData->jsStringVPtr); return string; }
+#else
+ inline JSString* fixupVPtr(JSGlobalData*, JSString* string) { return string; }
+#endif
+
+ inline JSString* asString(JSValue value)
+ {
+ ASSERT(asCell(value)->isString());
+ return static_cast<JSString*>(asCell(value));
+ }
+
+ inline JSString* jsEmptyString(JSGlobalData* globalData)
+ {
+ return globalData->smallStrings.emptyString(globalData);
+ }
+
+ inline JSString* jsSingleCharacterString(JSGlobalData* globalData, UChar c)
+ {
+ if (c <= 0xFF)
+ return globalData->smallStrings.singleCharacterString(globalData, c);
+ return fixupVPtr(globalData, new (globalData) JSString(globalData, UString(&c, 1)));
+ }
+
+ inline JSString* jsSingleCharacterSubstring(ExecState* exec, const UString& s, unsigned offset)
+ {
+ JSGlobalData* globalData = &exec->globalData();
+ ASSERT(offset < static_cast<unsigned>(s.size()));
+ UChar c = s.data()[offset];
+ if (c <= 0xFF)
+ return globalData->smallStrings.singleCharacterString(globalData, c);
+ return fixupVPtr(globalData, new (globalData) JSString(globalData, UString(UStringImpl::create(s.rep(), offset, 1))));
+ }
+
+ inline JSString* jsNontrivialString(JSGlobalData* globalData, const char* s)
+ {
+ ASSERT(s);
+ ASSERT(s[0]);
+ ASSERT(s[1]);
+ return fixupVPtr(globalData, new (globalData) JSString(globalData, s));
+ }
+
+ inline JSString* jsNontrivialString(JSGlobalData* globalData, const UString& s)
+ {
+ ASSERT(s.size() > 1);
+ return fixupVPtr(globalData, new (globalData) JSString(globalData, s));
+ }
+
+ inline JSString* JSString::getIndex(ExecState* exec, unsigned i)
+ {
+ ASSERT(canGetIndex(i));
+ if (isRope())
+ return getIndexSlowCase(exec, i);
+ ASSERT(i < m_value.size());
+ return jsSingleCharacterSubstring(exec, m_value, i);
+ }
+
+ inline JSString* jsString(JSGlobalData* globalData, const UString& s)
+ {
+ int size = s.size();
+ if (!size)
+ return globalData->smallStrings.emptyString(globalData);
+ if (size == 1) {
+ UChar c = s.data()[0];
+ if (c <= 0xFF)
+ return globalData->smallStrings.singleCharacterString(globalData, c);
+ }
+ return fixupVPtr(globalData, new (globalData) JSString(globalData, s));
+ }
+
+ inline JSString* jsStringWithFinalizer(ExecState* exec, const UString& s, JSStringFinalizerCallback callback, void* context)
+ {
+ ASSERT(s.size() && (s.size() > 1 || s.data()[0] > 0xFF));
+ JSGlobalData* globalData = &exec->globalData();
+ return fixupVPtr(globalData, new (globalData) JSString(globalData, s, callback, context));
+ }
+
+ inline JSString* jsSubstring(JSGlobalData* globalData, const UString& s, unsigned offset, unsigned length)
+ {
+ ASSERT(offset <= static_cast<unsigned>(s.size()));
+ ASSERT(length <= static_cast<unsigned>(s.size()));
+ ASSERT(offset + length <= static_cast<unsigned>(s.size()));
+ if (!length)
+ return globalData->smallStrings.emptyString(globalData);
+ if (length == 1) {
+ UChar c = s.data()[offset];
+ if (c <= 0xFF)
+ return globalData->smallStrings.singleCharacterString(globalData, c);
+ }
+ return fixupVPtr(globalData, new (globalData) JSString(globalData, UString(UStringImpl::create(s.rep(), offset, length)), JSString::HasOtherOwner));
+ }
+
+ inline JSString* jsOwnedString(JSGlobalData* globalData, const UString& s)
+ {
+ int size = s.size();
+ if (!size)
+ return globalData->smallStrings.emptyString(globalData);
+ if (size == 1) {
+ UChar c = s.data()[0];
+ if (c <= 0xFF)
+ return globalData->smallStrings.singleCharacterString(globalData, c);
+ }
+ return fixupVPtr(globalData, new (globalData) JSString(globalData, s, JSString::HasOtherOwner));
+ }
+
+ inline JSString* jsEmptyString(ExecState* exec) { return jsEmptyString(&exec->globalData()); }
+ inline JSString* jsString(ExecState* exec, const UString& s) { return jsString(&exec->globalData(), s); }
+ inline JSString* jsSingleCharacterString(ExecState* exec, UChar c) { return jsSingleCharacterString(&exec->globalData(), c); }
+ inline JSString* jsSubstring(ExecState* exec, const UString& s, unsigned offset, unsigned length) { return jsSubstring(&exec->globalData(), s, offset, length); }
+ inline JSString* jsNontrivialString(ExecState* exec, const UString& s) { return jsNontrivialString(&exec->globalData(), s); }
+ inline JSString* jsNontrivialString(ExecState* exec, const char* s) { return jsNontrivialString(&exec->globalData(), s); }
+ inline JSString* jsOwnedString(ExecState* exec, const UString& s) { return jsOwnedString(&exec->globalData(), s); }
+
+ ALWAYS_INLINE bool JSString::getStringPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
+ {
+ if (propertyName == exec->propertyNames().length) {
+ slot.setValue(jsNumber(exec, m_length));
+ return true;
+ }
+
+ bool isStrictUInt32;
+ unsigned i = propertyName.toStrictUInt32(&isStrictUInt32);
+ if (isStrictUInt32 && i < m_length) {
+ slot.setValue(getIndex(exec, i));
+ return true;
+ }
+
+ return false;
+ }
+
+ ALWAYS_INLINE bool JSString::getStringPropertySlot(ExecState* exec, unsigned propertyName, PropertySlot& slot)
+ {
+ if (propertyName < m_length) {
+ slot.setValue(getIndex(exec, propertyName));
+ return true;
+ }
+
+ return false;
+ }
+
+ inline bool isJSString(JSGlobalData* globalData, JSValue v) { return v.isCell() && v.asCell()->vptr() == globalData->jsStringVPtr; }
+
+ // --- JSValue inlines ----------------------------
+
+ inline UString JSValue::toString(ExecState* exec) const
+ {
+ if (isString())
+ return static_cast<JSString*>(asCell())->value(exec);
+ if (isInt32())
+ return exec->globalData().numericStrings.add(asInt32());
+ if (isDouble())
+ return exec->globalData().numericStrings.add(asDouble());
+ if (isTrue())
+ return "true";
+ if (isFalse())
+ return "false";
+ if (isNull())
+ return "null";
+ if (isUndefined())
+ return "undefined";
+ ASSERT(isCell());
+ return asCell()->toString(exec);
+ }
+
+ inline UString JSValue::toPrimitiveString(ExecState* exec) const
+ {
+ if (isString())
+ return static_cast<JSString*>(asCell())->value(exec);
+ if (isInt32())
+ return exec->globalData().numericStrings.add(asInt32());
+ if (isDouble())
+ return exec->globalData().numericStrings.add(asDouble());
+ if (isTrue())
+ return "true";
+ if (isFalse())
+ return "false";
+ if (isNull())
+ return "null";
+ if (isUndefined())
+ return "undefined";
+ ASSERT(isCell());
+ return asCell()->toPrimitive(exec, NoPreference).toString(exec);
+ }
+
+} // namespace JSC
+
+#endif // JSString_h