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 "Executable.h"
  25 #include "JITCode.h"
  26 #include "JSFunction.h"
  27 #include "JSGlobalObject.h"
  28 #include "Operations.h"
  29 #include "StringPrototype.h"
  30
  31 namespace JSC {
  32
  33 static EncodedJSValue JSC_HOST_CALL stringFromCharCode(ExecState*);
  34
  35 }
  36
  37 #include "StringConstructor.lut.h"
  38
  39 namespace JSC {
  40
  41 const ClassInfo StringConstructor::s_info = { "Function", &InternalFunction::s_info, 0, ExecState::stringConstructorTable, CREATE_METHOD_TABLE(StringConstructor) };
  42
  43 /* Source for StringConstructor.lut.h
  44 @begin stringConstructorTable
  45   fromCharCode          stringFromCharCode         DontEnum|Function 1
  46 @end
  47 */
  48
  49 ASSERT_HAS_TRIVIAL_DESTRUCTOR(StringConstructor);
  50
  51 StringConstructor::StringConstructor(JSGlobalObject* globalObject, Structure* structure)
  52     : InternalFunction(globalObject, structure)
  53 {
  54 }
  55
  56 void StringConstructor::finishCreation(ExecState* exec, StringPrototype* stringPrototype)
  57 {
  58     Base::finishCreation(exec->vm(), stringPrototype->classInfo()->className);
  59     putDirectWithoutTransition(exec->vm(), exec->propertyNames().prototype, stringPrototype, ReadOnly | DontEnum | DontDelete);
  60     putDirectWithoutTransition(exec->vm(), exec->propertyNames().length, jsNumber(1), ReadOnly | DontEnum | DontDelete);
  61 }
  62
  63 bool StringConstructor::getOwnPropertySlot(JSCell* cell, ExecState* exec, PropertyName propertyName, PropertySlot &slot)
  64 {
  65     return getStaticFunctionSlot<InternalFunction>(exec, ExecState::stringConstructorTable(exec), jsCast<StringConstructor*>(cell), propertyName, slot);
  66 }
  67
  68 bool StringConstructor::getOwnPropertyDescriptor(JSObject* object, ExecState* exec, PropertyName propertyName, PropertyDescriptor& descriptor)
  69 {
  70     return getStaticFunctionDescriptor<InternalFunction>(exec, ExecState::stringConstructorTable(exec), jsCast<StringConstructor*>(object), propertyName, descriptor);
  71 }
  72
  73 // ------------------------------ Functions --------------------------------
  74
  75 static NEVER_INLINE JSValue stringFromCharCodeSlowCase(ExecState* exec)
  76 {
  77     unsigned length = exec->argumentCount();
  78     UChar* buf;
  79     PassRefPtr<StringImpl> impl = StringImpl::createUninitialized(length, buf);
  80     for (unsigned i = 0; i < length; ++i)
  81         buf[i] = static_cast<UChar>(exec->argument(i).toUInt32(exec));
  82     return jsString(exec, impl);
  83 }
  84
  85 static EncodedJSValue JSC_HOST_CALL stringFromCharCode(ExecState* exec)
  86 {
  87     if (LIKELY(exec->argumentCount() == 1))
  88         return JSValue::encode(jsSingleCharacterString(exec, exec->argument(0).toUInt32(exec)));
  89     return JSValue::encode(stringFromCharCodeSlowCase(exec));
  90 }
  91
  92 JSCell* JSC_HOST_CALL stringFromCharCode(ExecState* exec, int32_t arg)
  93 {
  94     return jsSingleCharacterString(exec, arg);
  95 }
  96
  97 static EncodedJSValue JSC_HOST_CALL constructWithStringConstructor(ExecState* exec)
  98 {
  99     JSGlobalObject* globalObject = asInternalFunction(exec->callee())->globalObject();
 100     if (!exec->argumentCount())
 101         return JSValue::encode(StringObject::create(exec, globalObject->stringObjectStructure()));
 102
 103     return JSValue::encode(StringObject::create(exec, globalObject->stringObjectStructure(), exec->argument(0).toString(exec)));
 104 }
 105
 106 ConstructType StringConstructor::getConstructData(JSCell*, ConstructData& constructData)
 107 {
 108     constructData.native.function = constructWithStringConstructor;
 109     return ConstructTypeHost;
 110 }
 111
 112 static EncodedJSValue JSC_HOST_CALL callStringConstructor(ExecState* exec)
 113 {
 114     if (!exec->argumentCount())
 115         return JSValue::encode(jsEmptyString(exec));
 116     return JSValue::encode(exec->argument(0).toString(exec));
 117 }
 118
 119 CallType StringConstructor::getCallData(JSCell*, CallData& callData)
 120 {
 121     callData.native.function = callStringConstructor;
 122     return CallTypeHost;
 123 }
 124
 125 } // namespace JSC