X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/9dae56ea45a0f5f8136a5c93d6f3a7f99399ca73..cb9aa2694aba0ae4f946ed34b8e0f6c99c1cfe44:/runtime/JSString.h diff --git a/runtime/JSString.h b/runtime/JSString.h index e4baa73..1287b66 100644 --- a/runtime/JSString.h +++ b/runtime/JSString.h @@ -1,7 +1,7 @@ /* * 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. + * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2014 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 @@ -23,190 +23,607 @@ #ifndef JSString_h #define JSString_h -#include "CommonIdentifiers.h" #include "CallFrame.h" +#include "CommonIdentifiers.h" #include "Identifier.h" -#include "JSNumberCell.h" +#include "PropertyDescriptor.h" #include "PropertySlot.h" +#include "Structure.h" +#include namespace JSC { class JSString; + class JSRopeString; + class LLIntOffsetsExtractor; - JSString* jsEmptyString(JSGlobalData*); + JSString* jsEmptyString(VM*); 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* jsString(VM*, const String&); // returns empty string if passed null string + JSString* jsString(ExecState*, const String&); // returns empty string if passed null string - JSString* jsSingleCharacterString(JSGlobalData*, UChar); + JSString* jsSingleCharacterString(VM*, UChar); JSString* jsSingleCharacterString(ExecState*, UChar); - JSString* jsSingleCharacterSubstring(JSGlobalData*, const UString&, unsigned offset); - 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); + JSString* jsSingleCharacterSubstring(ExecState*, const String&, unsigned offset); + JSString* jsSubstring(VM*, const String&, unsigned offset, unsigned length); + JSString* jsSubstring(ExecState*, const String&, 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*); + JSString* jsNontrivialString(VM*, const String&); + JSString* jsNontrivialString(ExecState*, const String&); // 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&); + // DOM object that contains a String + JSString* jsOwnedString(VM*, const String&); + JSString* jsOwnedString(ExecState*, const String&); + + JSRopeString* jsStringBuilder(VM*); class JSString : public JSCell { + public: friend class JIT; - friend class Interpreter; + friend class VM; + friend class SpecializedThunkJIT; + friend class JSRopeString; + friend class MarkStack; + friend class SlotVisitor; + friend struct ThunkHelpers; - public: - JSString(JSGlobalData* globalData, const UString& value) - : JSCell(globalData->stringStructure.get()) + typedef JSCell Base; + + static const bool needsDestruction = true; + static const bool hasImmortalStructure = true; + static void destroy(JSCell*); + + private: + JSString(VM& vm, PassRefPtr value) + : JSCell(vm, vm.stringStructure.get()) + , m_flags(0) , m_value(value) { - Heap::heap(this)->reportExtraMemoryCost(value.cost()); } - enum HasOtherOwnerType { HasOtherOwner }; - JSString(JSGlobalData* globalData, const UString& value, HasOtherOwnerType) - : JSCell(globalData->stringStructure.get()) - , m_value(value) + JSString(VM& vm) + : JSCell(vm, vm.stringStructure.get()) + , m_flags(0) { } - JSString(JSGlobalData* globalData, PassRefPtr value, HasOtherOwnerType) - : JSCell(globalData->stringStructure.get()) - , m_value(value) + + void finishCreation(VM& vm, size_t length) { + ASSERT(!m_value.isNull()); + Base::finishCreation(vm); + m_length = length; + setIs8Bit(m_value.impl()->is8Bit()); + vm.m_newStringsSinceLastHashCons++; } - - const UString& value() const { return m_value; } - bool getStringPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&); + void finishCreation(VM& vm, size_t length, size_t cost) + { + ASSERT(!m_value.isNull()); + Base::finishCreation(vm); + m_length = length; + setIs8Bit(m_value.impl()->is8Bit()); + Heap::heap(this)->reportExtraMemoryCost(cost); + vm.m_newStringsSinceLastHashCons++; + } + + protected: + void finishCreation(VM& vm) + { + Base::finishCreation(vm); + m_length = 0; + setIs8Bit(true); + vm.m_newStringsSinceLastHashCons++; + } + + public: + static JSString* create(VM& vm, PassRefPtr value) + { + ASSERT(value); + int32_t length = value->length(); + RELEASE_ASSERT(length >= 0); + size_t cost = value->cost(); + JSString* newString = new (NotNull, allocateCell(vm.heap)) JSString(vm, value); + newString->finishCreation(vm, length, cost); + return newString; + } + static JSString* createHasOtherOwner(VM& vm, PassRefPtr value) + { + ASSERT(value); + size_t length = value->length(); + JSString* newString = new (NotNull, allocateCell(vm.heap)) JSString(vm, value); + newString->finishCreation(vm, length); + return newString; + } + + Identifier toIdentifier(ExecState*) const; + AtomicString toAtomicString(ExecState*) const; + AtomicStringImpl* toExistingAtomicString(ExecState*) const; + const String& value(ExecState*) const; + const String& tryGetValue() const; + const StringImpl* tryGetValueImpl() const; + unsigned length() const { return m_length; } + + JSValue toPrimitive(ExecState*, PreferredPrimitiveType) const; + JS_EXPORT_PRIVATE bool toBoolean() const; + bool getPrimitiveNumber(ExecState*, double& number, JSValue&) const; + JSObject* toObject(ExecState*, JSGlobalObject*) const; + double toNumber(ExecState*) const; + + bool getStringPropertySlot(ExecState*, PropertyName, PropertySlot&); bool getStringPropertySlot(ExecState*, unsigned propertyName, PropertySlot&); + bool getStringPropertyDescriptor(ExecState*, PropertyName, PropertyDescriptor&); - bool canGetIndex(unsigned i) { return i < static_cast(m_value.size()); } - JSString* getIndex(JSGlobalData*, unsigned); + bool canGetIndex(unsigned i) { return i < m_length; } + JSString* getIndex(ExecState*, unsigned); - static PassRefPtr createStructure(JSValuePtr proto) { return Structure::create(proto, TypeInfo(StringType, NeedsThisConversion)); } + static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue proto) + { + return Structure::create(vm, globalObject, proto, TypeInfo(StringType, StructureFlags), info()); + } + + static size_t offsetOfLength() { return OBJECT_OFFSETOF(JSString, m_length); } + static size_t offsetOfFlags() { return OBJECT_OFFSETOF(JSString, m_flags); } + static size_t offsetOfValue() { return OBJECT_OFFSETOF(JSString, m_value); } + + DECLARE_EXPORT_INFO; + + static void dumpToStream(const JSCell*, PrintStream&); + static void visitChildren(JSCell*, SlotVisitor&); + enum { + HashConsLock = 1u << 2, + IsHashConsSingleton = 1u << 1, + Is8Bit = 1u + }; + + protected: + static const unsigned StructureFlags = OverridesGetOwnPropertySlot | InterceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero | StructureIsImmortal; + + friend class JSValue; + + bool isRope() const { return m_value.isNull(); } + bool is8Bit() const { return m_flags & Is8Bit; } + void setIs8Bit(bool flag) + { + if (flag) + m_flags |= Is8Bit; + else + m_flags &= ~Is8Bit; + } + bool shouldTryHashCons(); + bool isHashConsSingleton() const { return m_flags & IsHashConsSingleton; } + void clearHashConsSingleton() { m_flags &= ~IsHashConsSingleton; } + void setHashConsSingleton() { m_flags |= IsHashConsSingleton; } + bool tryHashConsLock(); + void releaseHashConsLock(); + + unsigned m_flags; + + // A string is represented either by a String or a rope of fibers. + unsigned m_length; + mutable String m_value; + + private: + friend class LLIntOffsetsExtractor; + + static JSValue toThis(JSCell*, ExecState*, ECMAMode); + + String& string() { ASSERT(!isRope()); return m_value; } + + friend JSValue jsString(ExecState*, JSString*, JSString*); + friend JSString* jsSubstring(ExecState*, JSString*, unsigned offset, unsigned length); + }; + + class JSRopeString : public JSString { + friend class JSString; + + friend JSRopeString* jsStringBuilder(VM*); + + class RopeBuilder { + public: + RopeBuilder(VM& vm) + : m_vm(vm) + , m_jsString(jsStringBuilder(&vm)) + , m_index(0) + { + } + + bool append(JSString* jsString) + { + if (m_index == JSRopeString::s_maxInternalRopeLength) + expand(); + if (static_cast(m_jsString->length() + jsString->length()) < 0) { + m_jsString = nullptr; + return false; + } + m_jsString->append(m_vm, m_index++, jsString); + return true; + } + + JSRopeString* release() + { + RELEASE_ASSERT(m_jsString); + JSRopeString* tmp = m_jsString; + m_jsString = 0; + return tmp; + } + + unsigned length() const { return m_jsString->m_length; } + + private: + void expand(); + + VM& m_vm; + JSRopeString* m_jsString; + size_t m_index; + }; + private: - enum VPtrStealingHackType { VPtrStealingHack }; - JSString(VPtrStealingHackType) - : JSCell(0) + JSRopeString(VM& vm) + : JSString(vm) + { + } + + void finishCreation(VM& vm, JSString* s1, JSString* s2) + { + Base::finishCreation(vm); + m_length = s1->length() + s2->length(); + setIs8Bit(s1->is8Bit() && s2->is8Bit()); + m_fibers[0].set(vm, this, s1); + m_fibers[1].set(vm, this, s2); + } + + void finishCreation(VM& vm, JSString* s1, JSString* s2, JSString* s3) + { + Base::finishCreation(vm); + m_length = s1->length() + s2->length() + s3->length(); + setIs8Bit(s1->is8Bit() && s2->is8Bit() && s3->is8Bit()); + m_fibers[0].set(vm, this, s1); + m_fibers[1].set(vm, this, s2); + m_fibers[2].set(vm, this, s3); + } + + void finishCreation(VM& vm) { + JSString::finishCreation(vm); } - virtual JSValuePtr toPrimitive(ExecState*, PreferredPrimitiveType) const; - virtual bool getPrimitiveNumber(ExecState*, double& number, JSValuePtr& value); - virtual bool toBoolean(ExecState*) const; - virtual double toNumber(ExecState*) const; - virtual JSObject* toObject(ExecState*) const; - virtual UString toString(ExecState*) const; + void append(VM& vm, size_t index, JSString* jsString) + { + m_fibers[index].set(vm, this, jsString); + m_length += jsString->m_length; + RELEASE_ASSERT(static_cast(m_length) >= 0); + setIs8Bit(is8Bit() && jsString->is8Bit()); + } - virtual JSObject* toThisObject(ExecState*) const; - virtual UString toThisString(ExecState*) const; - virtual JSString* toThisJSString(ExecState*); + static JSRopeString* createNull(VM& vm) + { + JSRopeString* newString = new (NotNull, allocateCell(vm.heap)) JSRopeString(vm); + newString->finishCreation(vm); + return newString; + } - // Actually getPropertySlot, not getOwnPropertySlot (see JSCell). - virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&); - virtual bool getOwnPropertySlot(ExecState*, unsigned propertyName, PropertySlot&); + public: + static JSString* create(VM& vm, JSString* s1, JSString* s2) + { + JSRopeString* newString = new (NotNull, allocateCell(vm.heap)) JSRopeString(vm); + newString->finishCreation(vm, s1, s2); + return newString; + } + static JSString* create(VM& vm, JSString* s1, JSString* s2, JSString* s3) + { + JSRopeString* newString = new (NotNull, allocateCell(vm.heap)) JSRopeString(vm); + newString->finishCreation(vm, s1, s2, s3); + return newString; + } + + void visitFibers(SlotVisitor&); + + static ptrdiff_t offsetOfFibers() { return OBJECT_OFFSETOF(JSRopeString, m_fibers); } - UString m_value; + static const unsigned s_maxInternalRopeLength = 3; + + private: + friend JSValue jsStringFromRegisterArray(ExecState*, Register*, unsigned); + friend JSValue jsStringFromArguments(ExecState*, JSValue); + + JS_EXPORT_PRIVATE void resolveRope(ExecState*) const; + JS_EXPORT_PRIVATE void resolveRopeToAtomicString(ExecState*) const; + JS_EXPORT_PRIVATE AtomicStringImpl* resolveRopeToExistingAtomicString(ExecState*) const; + void resolveRopeSlowCase8(LChar*) const; + void resolveRopeSlowCase(UChar*) const; + void outOfMemory(ExecState*) const; + void resolveRopeInternal8(LChar*) const; + void resolveRopeInternal16(UChar*) const; + void clearFibers() const; + + JS_EXPORT_PRIVATE JSString* getIndexSlowCase(ExecState*, unsigned); + + mutable std::array, s_maxInternalRopeLength> m_fibers; }; - JSString* asString(JSValuePtr); - inline JSString* asString(JSValuePtr value) + inline const StringImpl* JSString::tryGetValueImpl() const + { + return m_value.impl(); + } + + JSString* asString(JSValue); + + inline JSString* asString(JSValue value) { - ASSERT(asCell(value)->isString()); - return static_cast(asCell(value)); + ASSERT(value.asCell()->isString()); + return jsCast(value.asCell()); } - inline JSString* jsEmptyString(JSGlobalData* globalData) + inline JSString* jsEmptyString(VM* vm) { - return globalData->smallStrings.emptyString(globalData); + return vm->smallStrings.emptyString(); } - inline JSString* jsSingleCharacterString(JSGlobalData* globalData, UChar c) + ALWAYS_INLINE JSString* jsSingleCharacterString(VM* vm, UChar c) { - if (c <= 0xFF) - return globalData->smallStrings.singleCharacterString(globalData, c); - return new (globalData) JSString(globalData, UString(&c, 1)); + if (c <= maxSingleCharacterString) + return vm->smallStrings.singleCharacterString(c); + return JSString::create(*vm, String(&c, 1).impl()); } - inline JSString* jsSingleCharacterSubstring(JSGlobalData* globalData, const UString& s, unsigned offset) + ALWAYS_INLINE JSString* jsSingleCharacterSubstring(ExecState* exec, const String& s, unsigned offset) { - ASSERT(offset < static_cast(s.size())); - UChar c = s.data()[offset]; - if (c <= 0xFF) - return globalData->smallStrings.singleCharacterString(globalData, c); - return new (globalData) JSString(globalData, UString::Rep::create(s.rep(), offset, 1)); + VM* vm = &exec->vm(); + ASSERT(offset < static_cast(s.length())); + UChar c = s.characterAt(offset); + if (c <= maxSingleCharacterString) + return vm->smallStrings.singleCharacterString(c); + return JSString::create(*vm, StringImpl::createSubstringSharingImpl(s.impl(), offset, 1)); } - inline JSString* jsNontrivialString(JSGlobalData* globalData, const char* s) + inline JSString* jsNontrivialString(VM* vm, const String& s) { - ASSERT(s); - ASSERT(s[0]); - ASSERT(s[1]); - return new (globalData) JSString(globalData, s); + ASSERT(s.length() > 1); + return JSString::create(*vm, s.impl()); } - inline JSString* jsNontrivialString(JSGlobalData* globalData, const UString& s) + ALWAYS_INLINE Identifier JSString::toIdentifier(ExecState* exec) const { - ASSERT(s.size() > 1); - return new (globalData) JSString(globalData, s); + return Identifier(exec, toAtomicString(exec)); } - inline JSString* JSString::getIndex(JSGlobalData* globalData, unsigned i) + ALWAYS_INLINE AtomicString JSString::toAtomicString(ExecState* exec) const + { + if (isRope()) + static_cast(this)->resolveRopeToAtomicString(exec); + return AtomicString(m_value); + } + + ALWAYS_INLINE AtomicStringImpl* JSString::toExistingAtomicString(ExecState* exec) const + { + if (isRope()) + return static_cast(this)->resolveRopeToExistingAtomicString(exec); + if (m_value.impl()->isAtomic()) + return static_cast(m_value.impl()); + if (AtomicStringImpl* existingAtomicString = AtomicString::find(m_value.impl())) { + m_value = *existingAtomicString; + return existingAtomicString; + } + return nullptr; + } + + inline const String& JSString::value(ExecState* exec) const + { + if (isRope()) + static_cast(this)->resolveRope(exec); + return m_value; + } + + inline const String& JSString::tryGetValue() const + { + if (isRope()) + static_cast(this)->resolveRope(0); + return m_value; + } + + inline JSString* JSString::getIndex(ExecState* exec, unsigned i) { ASSERT(canGetIndex(i)); - return jsSingleCharacterSubstring(globalData, m_value, i); + if (isRope()) + return static_cast(this)->getIndexSlowCase(exec, i); + ASSERT(i < m_value.length()); + return jsSingleCharacterSubstring(exec, m_value, i); } - 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* jsSingleCharacterSubstring(ExecState* exec, const UString& s, unsigned offset) { return jsSingleCharacterSubstring(&exec->globalData(), s, offset); } - 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); } + inline JSString* jsString(VM* vm, const String& s) + { + int size = s.length(); + if (!size) + return vm->smallStrings.emptyString(); + if (size == 1) { + UChar c = s.characterAt(0); + if (c <= maxSingleCharacterString) + return vm->smallStrings.singleCharacterString(c); + } + return JSString::create(*vm, s.impl()); + } + + inline JSString* jsSubstring(ExecState* exec, JSString* s, unsigned offset, unsigned length) + { + ASSERT(offset <= static_cast(s->length())); + ASSERT(length <= static_cast(s->length())); + ASSERT(offset + length <= static_cast(s->length())); + VM* vm = &exec->vm(); + if (!length) + return vm->smallStrings.emptyString(); + return jsSubstring(vm, s->value(exec), offset, length); + } + + inline JSString* jsSubstring8(VM* vm, const String& s, unsigned offset, unsigned length) + { + ASSERT(offset <= static_cast(s.length())); + ASSERT(length <= static_cast(s.length())); + ASSERT(offset + length <= static_cast(s.length())); + if (!length) + return vm->smallStrings.emptyString(); + if (length == 1) { + UChar c = s.characterAt(offset); + if (c <= maxSingleCharacterString) + return vm->smallStrings.singleCharacterString(c); + } + return JSString::createHasOtherOwner(*vm, StringImpl::createSubstringSharingImpl8(s.impl(), offset, length)); + } + + inline JSString* jsSubstring(VM* vm, const String& s, unsigned offset, unsigned length) + { + ASSERT(offset <= static_cast(s.length())); + ASSERT(length <= static_cast(s.length())); + ASSERT(offset + length <= static_cast(s.length())); + if (!length) + return vm->smallStrings.emptyString(); + if (length == 1) { + UChar c = s.characterAt(offset); + if (c <= maxSingleCharacterString) + return vm->smallStrings.singleCharacterString(c); + } + return JSString::createHasOtherOwner(*vm, StringImpl::createSubstringSharingImpl(s.impl(), offset, length)); + } + + inline JSString* jsOwnedString(VM* vm, const String& s) + { + int size = s.length(); + if (!size) + return vm->smallStrings.emptyString(); + if (size == 1) { + UChar c = s.characterAt(0); + if (c <= maxSingleCharacterString) + return vm->smallStrings.singleCharacterString(c); + } + return JSString::createHasOtherOwner(*vm, s.impl()); + } - ALWAYS_INLINE bool JSString::getStringPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot) + inline JSRopeString* jsStringBuilder(VM* vm) + { + return JSRopeString::createNull(*vm); + } + + inline JSString* jsEmptyString(ExecState* exec) { return jsEmptyString(&exec->vm()); } + inline JSString* jsString(ExecState* exec, const String& s) { return jsString(&exec->vm(), s); } + inline JSString* jsSingleCharacterString(ExecState* exec, UChar c) { return jsSingleCharacterString(&exec->vm(), c); } + inline JSString* jsSubstring8(ExecState* exec, const String& s, unsigned offset, unsigned length) { return jsSubstring8(&exec->vm(), s, offset, length); } + inline JSString* jsSubstring(ExecState* exec, const String& s, unsigned offset, unsigned length) { return jsSubstring(&exec->vm(), s, offset, length); } + inline JSString* jsNontrivialString(ExecState* exec, const String& s) { return jsNontrivialString(&exec->vm(), s); } + inline JSString* jsOwnedString(ExecState* exec, const String& s) { return jsOwnedString(&exec->vm(), s); } + + JS_EXPORT_PRIVATE JSString* jsStringWithCacheSlowCase(VM&, StringImpl&); + + ALWAYS_INLINE JSString* jsStringWithCache(ExecState* exec, const String& s) + { + VM& vm = exec->vm(); + StringImpl* stringImpl = s.impl(); + if (!stringImpl || !stringImpl->length()) + return jsEmptyString(&vm); + + if (stringImpl->length() == 1) { + UChar singleCharacter = (*stringImpl)[0u]; + if (singleCharacter <= maxSingleCharacterString) + return vm.smallStrings.singleCharacterString(static_cast(singleCharacter)); + } + + if (JSString* lastCachedString = vm.lastCachedString.get()) { + if (lastCachedString->tryGetValueImpl() == stringImpl) + return lastCachedString; + } + + return jsStringWithCacheSlowCase(vm, *stringImpl); + } + + ALWAYS_INLINE JSString* jsStringWithCache(ExecState* exec, const AtomicString& s) + { + return jsStringWithCache(exec, s.string()); + } + + ALWAYS_INLINE bool JSString::getStringPropertySlot(ExecState* exec, PropertyName propertyName, PropertySlot& slot) { if (propertyName == exec->propertyNames().length) { - slot.setValue(jsNumber(exec, m_value.size())); + slot.setValue(this, DontEnum | DontDelete | ReadOnly, jsNumber(m_length)); return true; } - bool isStrictUInt32; - unsigned i = propertyName.toStrictUInt32(&isStrictUInt32); - if (isStrictUInt32 && i < static_cast(m_value.size())) { - slot.setValue(jsSingleCharacterSubstring(exec, m_value, i)); + unsigned i = propertyName.asIndex(); + if (i < m_length) { + ASSERT(i != PropertyName::NotAnIndex); // No need for an explicit check, the above test would always fail! + slot.setValue(this, DontDelete | ReadOnly, getIndex(exec, i)); return true; } return false; } - + ALWAYS_INLINE bool JSString::getStringPropertySlot(ExecState* exec, unsigned propertyName, PropertySlot& slot) { - if (propertyName < static_cast(m_value.size())) { - slot.setValue(jsSingleCharacterSubstring(exec, m_value, propertyName)); + if (propertyName < m_length) { + slot.setValue(this, DontDelete | ReadOnly, getIndex(exec, propertyName)); return true; } return false; } + inline bool isJSString(JSValue v) { return v.isCell() && v.asCell()->type() == StringType; } + // --- JSValue inlines ---------------------------- + + inline bool JSValue::toBoolean(ExecState* exec) const + { + if (isInt32()) + return asInt32(); + if (isDouble()) + return asDouble() > 0.0 || asDouble() < 0.0; // false for NaN + if (isCell()) + return asCell()->toBoolean(exec); + return isTrue(); // false, null, and undefined all convert to false. + } + + inline JSString* JSValue::toString(ExecState* exec) const + { + if (isString()) + return jsCast(asCell()); + return toStringSlowCase(exec); + } - inline JSString* JSValuePtr::toThisJSString(ExecState* exec) + inline String JSValue::toWTFString(ExecState* exec) const { - return JSImmediate::isImmediate(asValue()) ? jsString(exec, JSImmediate::toString(asValue())) : asCell()->toThisJSString(exec); + if (isString()) + return static_cast(asCell())->value(exec); + return toWTFStringSlowCase(exec); + } + + ALWAYS_INLINE String inlineJSValueNotStringtoString(const JSValue& value, ExecState* exec) + { + VM& vm = exec->vm(); + if (value.isInt32()) + return vm.numericStrings.add(value.asInt32()); + if (value.isDouble()) + return vm.numericStrings.add(value.asDouble()); + if (value.isTrue()) + return vm.propertyNames->trueKeyword.string(); + if (value.isFalse()) + return vm.propertyNames->falseKeyword.string(); + if (value.isNull()) + return vm.propertyNames->nullKeyword.string(); + if (value.isUndefined()) + return vm.propertyNames->undefinedKeyword.string(); + return value.toString(exec)->value(exec); + } + + ALWAYS_INLINE String JSValue::toWTFStringInline(ExecState* exec) const + { + if (isString()) + return static_cast(asCell())->value(exec); + + return inlineJSValueNotStringtoString(*this, exec); } } // namespace JSC