1 /*

     2  *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)

     3  *  Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.

     4  *

     5  *  This library is free software; you can redistribute it and/or

     6  *  modify it under the terms of the GNU Lesser General Public

     7  *  License as published by the Free Software Foundation; either

     8  *  version 2 of the License, or (at your option) any later version.

     9  *

    10  *  This library is distributed in the hope that it will be useful,

    11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of

    12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    13  *  Lesser General Public License for more details.

    14  *

    15  *  You should have received a copy of the GNU Lesser General Public

    16  *  License along with this library; if not, write to the Free Software

    17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

    18  *

    19  */

    20 

    21 #include "config.h"

    22 #include "StringConstructor.h"

    23 

    24 #include "Executable.h"

    25 #include "JITCode.h"

    26 #include "JSFunction.h"

    27 #include "JSGlobalObject.h"

    28 #include "PrototypeFunction.h"

    29 #include "StringPrototype.h"

    30 

    31 namespace JSC {

    32 

    33 static NEVER_INLINE JSValue stringFromCharCodeSlowCase(ExecState* exec)

    34 {

    35     unsigned length = exec->argumentCount();

    36     UChar* buf;

    37     PassRefPtr<UStringImpl> impl = UStringImpl::createUninitialized(length, buf);

    38     for (unsigned i = 0; i < length; ++i)

    39         buf[i] = static_cast<UChar>(exec->argument(i).toUInt32(exec));

    40     return jsString(exec, impl);

    41 }

    42 

    43 static EncodedJSValue JSC_HOST_CALL stringFromCharCode(ExecState* exec)

    44 {

    45     if (LIKELY(exec->argumentCount() == 1))

    46         return JSValue::encode(jsSingleCharacterString(exec, exec->argument(0).toUInt32(exec)));

    47     return JSValue::encode(stringFromCharCodeSlowCase(exec));

    48 }

    49 

    50 ASSERT_CLASS_FITS_IN_CELL(StringConstructor);

    51 

    52 StringConstructor::StringConstructor(ExecState* exec, JSGlobalObject* globalObject, NonNullPassRefPtr<Structure> structure, Structure* prototypeFunctionStructure, StringPrototype* stringPrototype)

    53     : InternalFunction(&exec->globalData(), globalObject, structure, Identifier(exec, stringPrototype->classInfo()->className))

    54 {

    55     // ECMA 15.5.3.1 String.prototype

    56     putDirectWithoutTransition(exec->propertyNames().prototype, stringPrototype, ReadOnly | DontEnum | DontDelete);

    57 

    58     // ECMA 15.5.3.2 fromCharCode()

    59 #if ENABLE(JIT) && ENABLE(JIT_OPTIMIZE_NATIVE_CALL)

    60     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, globalObject, prototypeFunctionStructure, 1, exec->propertyNames().fromCharCode, exec->globalData().getHostFunction(stringFromCharCode, fromCharCodeThunkGenerator)), DontEnum);

    61 #else

    62     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, globalObject, prototypeFunctionStructure, 1, exec->propertyNames().fromCharCode, stringFromCharCode), DontEnum);

    63 #endif

    64     // no. of arguments for constructor

    65     putDirectWithoutTransition(exec->propertyNames().length, jsNumber(exec, 1), ReadOnly | DontEnum | DontDelete);

    66 }

    67 

    68 // ECMA 15.5.2

    69 static EncodedJSValue JSC_HOST_CALL constructWithStringConstructor(ExecState* exec)

    70 {

    71     if (!exec->argumentCount())

    72         return JSValue::encode(new (exec) StringObject(exec, exec->lexicalGlobalObject()->stringObjectStructure()));

    73     return JSValue::encode(new (exec) StringObject(exec, exec->lexicalGlobalObject()->stringObjectStructure(), exec->argument(0).toString(exec)));

    74 }

    75 

    76 ConstructType StringConstructor::getConstructData(ConstructData& constructData)

    77 {

    78     constructData.native.function = constructWithStringConstructor;

    79     return ConstructTypeHost;

    80 }

    81 

    82 // ECMA 15.5.1

    83 static EncodedJSValue JSC_HOST_CALL callStringConstructor(ExecState* exec)

    84 {

    85     if (!exec->argumentCount())

    86         return JSValue::encode(jsEmptyString(exec));

    87     return JSValue::encode(jsString(exec, exec->argument(0).toString(exec)));

    88 }

    89 

    90 CallType StringConstructor::getCallData(CallData& callData)

    91 {

    92     callData.native.function = callStringConstructor;

    93     return CallTypeHost;

    94 }

    95 

    96 } // namespace JSC