runtime/StringConstructor.cpp

   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 "JSFunction.h"
  25 #include "JSGlobalObject.h"
  26 #include "PrototypeFunction.h"
  27 #include "StringPrototype.h"
  28
  29 namespace JSC {
  30
  31 static NEVER_INLINE JSValue stringFromCharCodeSlowCase(ExecState* exec, const ArgList& args)
  32 {
  33     unsigned length = args.size();
  34     UChar* buf;
  35     PassRefPtr<UStringImpl> impl = UStringImpl::createUninitialized(length, buf);
  36     for (unsigned i = 0; i < length; ++i)
  37         buf[i] = static_cast<UChar>(args.at(i).toUInt32(exec));
  38     return jsString(exec, impl);
  39 }
  40
  41 static JSValue JSC_HOST_CALL stringFromCharCode(ExecState* exec, JSObject*, JSValue, const ArgList& args)
  42 {
  43     if (LIKELY(args.size() == 1))
  44         return jsSingleCharacterString(exec, args.at(0).toUInt32(exec));
  45     return stringFromCharCodeSlowCase(exec, args);
  46 }
  47
  48 ASSERT_CLASS_FITS_IN_CELL(StringConstructor);
  49
  50 StringConstructor::StringConstructor(ExecState* exec, NonNullPassRefPtr<Structure> structure, Structure* prototypeFunctionStructure, StringPrototype* stringPrototype)
  51     : InternalFunction(&exec->globalData(), structure, Identifier(exec, stringPrototype->classInfo()->className))
  52 {
  53     // ECMA 15.5.3.1 String.prototype
  54     putDirectWithoutTransition(exec->propertyNames().prototype, stringPrototype, ReadOnly | DontEnum | DontDelete);
  55
  56     // ECMA 15.5.3.2 fromCharCode()
  57 #if ENABLE(JIT) && ENABLE(JIT_OPTIMIZE_NATIVE_CALL)
  58     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, prototypeFunctionStructure, 1, exec->propertyNames().fromCharCode, exec->globalData().getThunk(fromCharCodeThunkGenerator), stringFromCharCode), DontEnum);
  59 #else
  60     putDirectFunctionWithoutTransition(exec, new (exec) NativeFunctionWrapper(exec, prototypeFunctionStructure, 1, exec->propertyNames().fromCharCode, stringFromCharCode), DontEnum);
  61 #endif
  62     // no. of arguments for constructor
  63     putDirectWithoutTransition(exec->propertyNames().length, jsNumber(exec, 1), ReadOnly | DontEnum | DontDelete);
  64 }
  65
  66 // ECMA 15.5.2
  67 static JSObject* constructWithStringConstructor(ExecState* exec, JSObject*, const ArgList& args)
  68 {
  69     if (args.isEmpty())
  70         return new (exec) StringObject(exec, exec->lexicalGlobalObject()->stringObjectStructure());
  71     return new (exec) StringObject(exec, exec->lexicalGlobalObject()->stringObjectStructure(), args.at(0).toString(exec));
  72 }
  73
  74 ConstructType StringConstructor::getConstructData(ConstructData& constructData)
  75 {
  76     constructData.native.function = constructWithStringConstructor;
  77     return ConstructTypeHost;
  78 }
  79
  80 // ECMA 15.5.1
  81 static JSValue JSC_HOST_CALL callStringConstructor(ExecState* exec, JSObject*, JSValue, const ArgList& args)
  82 {
  83     if (args.isEmpty())
  84         return jsEmptyString(exec);
  85     return jsString(exec, args.at(0).toString(exec));
  86 }
  87
  88 CallType StringConstructor::getCallData(CallData& callData)
  89 {
  90     callData.native.function = callStringConstructor;
  91     return CallTypeHost;
  92 }
  93
  94 } // namespace JSC