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      1 /*
      2  *  Copyright (C) 1999-2001 Harri Porten (porten (at) 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 "StringPrototype.h"
     29 
     30 namespace JSC {
     31 
     32 static NEVER_INLINE JSValue stringFromCharCodeSlowCase(ExecState* exec)
     33 {
     34     unsigned length = exec->argumentCount();
     35     UChar* buf;
     36     PassRefPtr<StringImpl> impl = StringImpl::createUninitialized(length, buf);
     37     for (unsigned i = 0; i < length; ++i)
     38         buf[i] = static_cast<UChar>(exec->argument(i).toUInt32(exec));
     39     return jsString(exec, impl);
     40 }
     41 
     42 static EncodedJSValue JSC_HOST_CALL stringFromCharCode(ExecState* exec)
     43 {
     44     if (LIKELY(exec->argumentCount() == 1))
     45         return JSValue::encode(jsSingleCharacterString(exec, exec->argument(0).toUInt32(exec)));
     46     return JSValue::encode(stringFromCharCodeSlowCase(exec));
     47 }
     48 
     49 ASSERT_CLASS_FITS_IN_CELL(StringConstructor);
     50 
     51 StringConstructor::StringConstructor(ExecState* exec, JSGlobalObject* globalObject, Structure* structure, Structure* functionStructure, StringPrototype* stringPrototype)
     52     : InternalFunction(&exec->globalData(), globalObject, structure, Identifier(exec, stringPrototype->classInfo()->className))
     53 {
     54     // ECMA 15.5.3.1 String.prototype
     55     putDirectWithoutTransition(exec->globalData(), exec->propertyNames().prototype, stringPrototype, ReadOnly | DontEnum | DontDelete);
     56 
     57     // ECMA 15.5.3.2 fromCharCode()
     58 #if ENABLE(JIT) && ENABLE(JIT_OPTIMIZE_NATIVE_CALL)
     59     putDirectFunctionWithoutTransition(exec, new (exec) JSFunction(exec, globalObject, functionStructure, 1, exec->propertyNames().fromCharCode, exec->globalData().getHostFunction(stringFromCharCode, fromCharCodeThunkGenerator)), DontEnum);
     60 #else
     61     putDirectFunctionWithoutTransition(exec, new (exec) JSFunction(exec, globalObject, functionStructure, 1, exec->propertyNames().fromCharCode, stringFromCharCode), DontEnum);
     62 #endif
     63     // no. of arguments for constructor
     64     putDirectWithoutTransition(exec->globalData(), exec->propertyNames().length, jsNumber(1), ReadOnly | DontEnum | DontDelete);
     65 }
     66 
     67 // ECMA 15.5.2
     68 static EncodedJSValue JSC_HOST_CALL constructWithStringConstructor(ExecState* exec)
     69 {
     70     JSGlobalObject* globalObject = asInternalFunction(exec->callee())->globalObject();
     71     if (!exec->argumentCount())
     72         return JSValue::encode(new (exec) StringObject(exec, globalObject->stringObjectStructure()));
     73     return JSValue::encode(new (exec) StringObject(exec, globalObject->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
     97