1 /*

     2  *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)

     3  *  Copyright (C) 2001 Peter Kelly (pmk@post.com)

     4  *  Copyright (C) 2003, 2007, 2008 Apple Inc. All rights reserved.

     5  *

     6  *  This library is free software; you can redistribute it and/or

     7  *  modify it under the terms of the GNU Library General Public

     8  *  License as published by the Free Software Foundation; either

     9  *  version 2 of the License, or (at your option) any later version.

    10  *

    11  *  This library is distributed in the hope that it will be useful,

    12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of

    13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    14  *  Library General Public License for more details.

    15  *

    16  *  You should have received a copy of the GNU Library General Public License

    17  *  along with this library; see the file COPYING.LIB.  If not, write to

    18  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

    19  *  Boston, MA 02110-1301, USA.

    20  *

    21  */

    22 

    23 #include "config.h"

    24 #include "JSValue.h"

    25 

    26 #include "BooleanConstructor.h"

    27 #include "BooleanPrototype.h"

    28 #include "Error.h"

    29 #include "ExceptionHelpers.h"

    30 #include "JSGlobalObject.h"

    31 #include "JSFunction.h"

    32 #include "JSNotAnObject.h"

    33 #include "NumberObject.h"

    34 #include <wtf/MathExtras.h>

    35 #include <wtf/StringExtras.h>

    36 

    37 namespace JSC {

    38 

    39 static const double D32 = 4294967296.0;

    40 

    41 // ECMA 9.4

    42 double JSValue::toInteger(ExecState* exec) const

    43 {

    44     if (isInt32())

    45         return asInt32();

    46     double d = toNumber(exec);

    47     return isnan(d) ? 0.0 : trunc(d);

    48 }

    49 

    50 double JSValue::toIntegerPreserveNaN(ExecState* exec) const

    51 {

    52     if (isInt32())

    53         return asInt32();

    54     return trunc(toNumber(exec));

    55 }

    56 

    57 JSObject* JSValue::toObjectSlowCase(ExecState* exec) const

    58 {

    59     ASSERT(!isCell());

    60 

    61     if (isInt32() || isDouble())

    62         return constructNumber(exec, asValue());

    63     if (isTrue() || isFalse())

    64         return constructBooleanFromImmediateBoolean(exec, asValue());

    65     ASSERT(isUndefinedOrNull());

    66     JSNotAnObjectErrorStub* exception = createNotAnObjectErrorStub(exec, isNull());

    67     throwError(exec, exception);

    68     return new (exec) JSNotAnObject(exec, exception);

    69 }

    70 

    71 JSObject* JSValue::toThisObjectSlowCase(ExecState* exec) const

    72 {

    73     ASSERT(!isCell());

    74 

    75     if (isInt32() || isDouble())

    76         return constructNumber(exec, asValue());

    77     if (isTrue() || isFalse())

    78         return constructBooleanFromImmediateBoolean(exec, asValue());

    79     ASSERT(isUndefinedOrNull());

    80     return exec->globalThisValue();

    81 }

    82 

    83 JSObject* JSValue::synthesizeObject(ExecState* exec) const

    84 {

    85     ASSERT(!isCell());

    86     if (isNumber())

    87         return constructNumber(exec, asValue());

    88     if (isBoolean())

    89         return constructBooleanFromImmediateBoolean(exec, asValue());

    90     

    91     JSNotAnObjectErrorStub* exception = createNotAnObjectErrorStub(exec, isNull());

    92     throwError(exec, exception);

    93     return new (exec) JSNotAnObject(exec, exception);

    94 }

    95 

    96 JSObject* JSValue::synthesizePrototype(ExecState* exec) const

    97 {

    98     ASSERT(!isCell());

    99     if (isNumber())

   100         return exec->lexicalGlobalObject()->numberPrototype();

   101     if (isBoolean())

   102         return exec->lexicalGlobalObject()->booleanPrototype();

   103 

   104     JSNotAnObjectErrorStub* exception = createNotAnObjectErrorStub(exec, isNull());

   105     throwError(exec, exception);

   106     return new (exec) JSNotAnObject(exec, exception);

   107 }

   108 

   109 #ifndef NDEBUG

   110 char* JSValue::description()

   111 {

   112     static const size_t size = 32;

   113     static char description[size];

   114 

   115     if (!*this)

   116         snprintf(description, size, "<JSValue()>");

   117     else if (isInt32())

   118         snprintf(description, size, "Int32: %d", asInt32());

   119     else if (isDouble())

   120         snprintf(description, size, "Double: %lf", asDouble());

   121     else if (isCell())

   122         snprintf(description, size, "Cell: %p", asCell());

   123     else if (isTrue())

   124         snprintf(description, size, "True");

   125     else if (isFalse())

   126         snprintf(description, size, "False");

   127     else if (isNull())

   128         snprintf(description, size, "Null");

   129     else if (isUndefined())

   130         snprintf(description, size, "Undefined");

   131     else

   132         snprintf(description, size, "INVALID");

   133 

   134     return description;

   135 }

   136 #endif

   137 

   138 int32_t toInt32SlowCase(double d, bool& ok)

   139 {

   140     ok = true;

   141 

   142     if (d >= -D32 / 2 && d < D32 / 2)

   143         return static_cast<int32_t>(d);

   144 

   145     if (isnan(d) || isinf(d)) {

   146         ok = false;

   147         return 0;

   148     }

   149 

   150     double d32 = fmod(trunc(d), D32);

   151     if (d32 >= D32 / 2)

   152         d32 -= D32;

   153     else if (d32 < -D32 / 2)

   154         d32 += D32;

   155     return static_cast<int32_t>(d32);

   156 }

   157 

   158 uint32_t toUInt32SlowCase(double d, bool& ok)

   159 {

   160     ok = true;

   161 

   162     if (d >= 0.0 && d < D32)

   163         return static_cast<uint32_t>(d);

   164 

   165     if (isnan(d) || isinf(d)) {

   166         ok = false;

   167         return 0;

   168     }

   169 

   170     double d32 = fmod(trunc(d), D32);

   171     if (d32 < 0)

   172         d32 += D32;

   173     return static_cast<uint32_t>(d32);

   174 }

   175 

   176 NEVER_INLINE double nonInlineNaN()

   177 {

   178 #if OS(SYMBIAN)

   179     return nanval();

   180 #else

   181     return std::numeric_limits<double>::quiet_NaN();

   182 #endif

   183 }

   184 

   185 bool JSValue::isValidCallee()

   186 {

   187     return asObject(asObject(asCell())->getAnonymousValue(0))->isGlobalObject();

   188 }

   189 

   190 } // namespace JSC