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 "StringPrototype.h"
29
30 namespace JSC {
31
stringFromCharCodeSlowCase(ExecState * exec)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
stringFromCharCode(ExecState * exec)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
StringConstructor(ExecState * exec,JSGlobalObject * globalObject,Structure * structure,Structure * functionStructure,StringPrototype * stringPrototype)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
constructWithStringConstructor(ExecState * exec)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
getConstructData(ConstructData & constructData)76 ConstructType StringConstructor::getConstructData(ConstructData& constructData)
77 {
78 constructData.native.function = constructWithStringConstructor;
79 return ConstructTypeHost;
80 }
81
82 // ECMA 15.5.1
callStringConstructor(ExecState * exec)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
getCallData(CallData & callData)90 CallType StringConstructor::getCallData(CallData& callData)
91 {
92 callData.native.function = callStringConstructor;
93 return CallTypeHost;
94 }
95
96 } // namespace JSC
97