runtime/Operations.cpp

   1 /*
   2  * Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
   3  * Copyright (C) 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 Library 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  *  Library General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Library General Public License
  16  *  along with this library; see the file COPYING.LIB.  If not, write to
  17  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18  *  Boston, MA 02110-1301, USA.
  19  *
  20  */
  21
  22 #include "config.h"
  23 #include "Operations.h"
  24
  25 #include "Error.h"
  26 #include "JSCInlines.h"
  27 #include "JSObject.h"
  28 #include "JSString.h"
  29 #include <wtf/MathExtras.h>
  30
  31 namespace JSC {
  32
  33 bool JSValue::equalSlowCase(ExecState* exec, JSValue v1, JSValue v2)
  34 {
  35     return equalSlowCaseInline(exec, v1, v2);
  36 }
  37
  38 bool JSValue::strictEqualSlowCase(ExecState* exec, JSValue v1, JSValue v2)
  39 {
  40     return strictEqualSlowCaseInline(exec, v1, v2);
  41 }
  42
  43 NEVER_INLINE JSValue jsAddSlowCase(CallFrame* callFrame, JSValue v1, JSValue v2)
  44 {
  45     // exception for the Date exception in defaultValue()
  46     JSValue p1 = v1.toPrimitive(callFrame);
  47     JSValue p2 = v2.toPrimitive(callFrame);
  48
  49     if (p1.isString())
  50         return jsString(callFrame, asString(p1), p2.toString(callFrame));
  51
  52     if (p2.isString())
  53         return jsString(callFrame, p1.toString(callFrame), asString(p2));
  54
  55     return jsNumber(p1.toNumber(callFrame) + p2.toNumber(callFrame));
  56 }
  57
  58 JSValue jsTypeStringForValue(VM& vm, JSGlobalObject* globalObject, JSValue v)
  59 {
  60     if (v.isUndefined())
  61         return vm.smallStrings.undefinedString();
  62     if (v.isBoolean())
  63         return vm.smallStrings.booleanString();
  64     if (v.isNumber())
  65         return vm.smallStrings.numberString();
  66     if (v.isString())
  67         return vm.smallStrings.stringString();
  68     if (v.isSymbol())
  69         return vm.smallStrings.symbolString();
  70     if (v.isObject()) {
  71         JSObject* object = asObject(v);
  72         // Return "undefined" for objects that should be treated
  73         // as null when doing comparisons.
  74         if (object->structure(vm)->masqueradesAsUndefined(globalObject))
  75             return vm.smallStrings.undefinedString();
  76         if (object->type() == JSFunctionType)
  77             return vm.smallStrings.functionString();
  78         if (object->inlineTypeFlags() & TypeOfShouldCallGetCallData) {
  79             CallData callData;
  80             JSObject* object = asObject(v);
  81             if (object->methodTable(vm)->getCallData(object, callData) != CallTypeNone)
  82                 return vm.smallStrings.functionString();
  83         }
  84     }
  85     return vm.smallStrings.objectString();
  86 }
  87
  88 JSValue jsTypeStringForValue(CallFrame* callFrame, JSValue v)
  89 {
  90     return jsTypeStringForValue(callFrame->vm(), callFrame->lexicalGlobalObject(), v);
  91 }
  92
  93 bool jsIsObjectTypeOrNull(CallFrame* callFrame, JSValue v)
  94 {
  95     if (!v.isCell())
  96         return v.isNull();
  97
  98     JSType type = v.asCell()->type();
  99     if (type == StringType || type == SymbolType)
 100         return false;
 101     if (type >= ObjectType) {
 102         if (asObject(v)->structure(callFrame->vm())->masqueradesAsUndefined(callFrame->lexicalGlobalObject()))
 103             return false;
 104         CallData callData;
 105         JSObject* object = asObject(v);
 106         if (object->methodTable(callFrame->vm())->getCallData(object, callData) != CallTypeNone)
 107             return false;
 108     }
 109     return true;
 110 }
 111
 112 bool jsIsFunctionType(JSValue v)
 113 {
 114     if (v.isObject()) {
 115         CallData callData;
 116         JSObject* object = asObject(v);
 117         if (object->methodTable()->getCallData(object, callData) != CallTypeNone)
 118             return true;
 119     }
 120     return false;
 121 }
 122
 123 } // namespace JSC