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qtdeclarative/qmljs_value.h

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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the V4VM module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QMLJS_VALUE_H
#define QMLJS_VALUE_H
#include <wtf/Platform.h>
#include <QtCore/QString>
#include <QtCore/qnumeric.h>
#include <QtCore/QDebug>
namespace QQmlJS {
namespace VM {
struct String;
struct Object;
struct BooleanObject;
struct NumberObject;
struct StringObject;
struct ArrayObject;
struct DateObject;
struct FunctionObject;
struct RegExpObject;
struct ErrorObject;
struct ArgumentsObject;
struct ExecutionContext;
struct ExecutionEngine;
struct Value;
extern "C" {
double __qmljs_to_number(Value value, ExecutionContext *ctx);
}
typedef uint Bool;
struct Value
{
union {
quint64 val;
double dbl;
struct {
#if Q_BYTE_ORDER != Q_LITTLE_ENDIAN
uint tag;
#endif
union {
uint uint_32;
int int_32;
#if CPU(X86_64)
#else
Object *o;
String *s;
#endif
};
#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
uint tag;
#endif
};
};
enum Masks {
NotDouble_Mask = 0xfff80000,
Type_Mask = 0xffff0000,
Immediate_Mask = NotDouble_Mask | 0x00040000,
Tag_Shift = 32
};
enum ValueType {
Undefined_Type = Immediate_Mask | 0x00000,
Null_Type = Immediate_Mask | 0x10000,
Boolean_Type = Immediate_Mask | 0x20000,
Integer_Type = Immediate_Mask | 0x30000,
Object_Type = NotDouble_Mask | 0x00000,
String_Type = NotDouble_Mask | 0x10000
};
enum ImmediateFlags {
ConvertibleToInt = Immediate_Mask | (0x1 << 15)
};
enum ValueTypeInternal {
_Undefined_Type = Undefined_Type,
_Null_Type = Null_Type | ConvertibleToInt,
_Boolean_Type = Boolean_Type | ConvertibleToInt,
_Integer_Type = Integer_Type | ConvertibleToInt,
_Object_Type = Object_Type,
_String_Type = String_Type
};
inline unsigned type() const {
return tag & Type_Mask;
}
inline bool isUndefined() const { return tag == _Undefined_Type; }
inline bool isNull() const { return tag == _Null_Type; }
inline bool isBoolean() const { return tag == _Boolean_Type; }
inline bool isInteger() const { return tag == _Integer_Type; }
inline bool isDouble() const { return (tag & NotDouble_Mask) != NotDouble_Mask; }
inline bool isNumber() const { return tag == _Integer_Type || (tag & NotDouble_Mask) != NotDouble_Mask; }
#if CPU(X86_64)
inline bool isString() const { return (tag & Type_Mask) == String_Type; }
inline bool isObject() const { return (tag & Type_Mask) == Object_Type; }
#else
inline bool isString() const { return tag == String_Type; }
inline bool isObject() const { return tag == Object_Type; }
#endif
inline bool isConvertibleToInt() const { return (tag & ConvertibleToInt) == ConvertibleToInt; }
Bool booleanValue() const {
return int_32;
}
double doubleValue() const {
return dbl;
}
void setDouble(double d) {
dbl = d;
}
double asDouble() const {
if (tag == _Integer_Type)
return int_32;
return dbl;
}
int integerValue() const {
return int_32;
}
#if CPU(X86_64)
String *stringValue() const {
return (String *)(val & ~(quint64(Type_Mask) << Tag_Shift));
}
Object *objectValue() const {
return (Object *)(val & ~(quint64(Type_Mask) << Tag_Shift));
}
#else
String *stringValue() const {
return s;
}
Object *objectValue() const {
return o;
}
#endif
quint64 rawValue() const {
return val;
}
static Value undefinedValue();
static Value nullValue();
static Value fromBoolean(Bool b);
static Value fromDouble(double d);
static Value fromInt32(int i);
static Value fromString(String *s);
static Value fromObject(Object *o);
#ifndef QMLJS_LLVM_RUNTIME
static Value fromString(ExecutionContext *ctx, const QString &fromString);
#endif
static double toInteger(double fromNumber);
static int toInt32(double value);
static unsigned int toUInt32(double value);
int toUInt16(ExecutionContext *ctx);
int toInt32(ExecutionContext *ctx);
unsigned int toUInt32(ExecutionContext *ctx);
Bool toBoolean(ExecutionContext *ctx) const;
double toInteger(ExecutionContext *ctx) const;
double toNumber(ExecutionContext *ctx) const;
String *toString(ExecutionContext *ctx) const;
Value toObject(ExecutionContext *ctx) const;
inline bool isPrimitive() const { return !isObject(); }
#if CPU(X86_64)
inline bool integerCompatible() const {
const quint64 mask = quint64(ConvertibleToInt) << 32;
return (val & mask) == mask;
}
static inline bool integerCompatible(Value a, Value b) {
const quint64 mask = quint64(ConvertibleToInt) << 32;
return ((a.val & b.val) & mask) == mask;
}
static inline bool bothDouble(Value a, Value b) {
const quint64 mask = quint64(NotDouble_Mask) << 32;
return ((a.val | b.val) & mask) != mask;
}
#else
inline bool integerCompatible() const {
return (tag & ConvertibleToInt) == ConvertibleToInt;
}
static inline bool integerCompatible(Value a, Value b) {
return ((a.tag & b.tag) & ConvertibleToInt) == ConvertibleToInt;
}
static inline bool bothDouble(Value a, Value b) {
return ((a.tag | b.tag) & NotDouble_Mask) != NotDouble_Mask;
}
#endif
inline bool tryIntegerConversion() {
bool b = isConvertibleToInt();
if (b)
tag = _Integer_Type;
return b;
}
Object *asObject() const;
FunctionObject *asFunctionObject() const;
BooleanObject *asBooleanObject() const;
NumberObject *asNumberObject() const;
StringObject *asStringObject() const;
DateObject *asDateObject() const;
RegExpObject *asRegExpObject() const;
ArrayObject *asArrayObject() const;
ErrorObject *asErrorObject() const;
Value property(ExecutionContext *ctx, String *name) const;
// Section 9.12
bool sameValue(Value other);
};
inline Value Value::undefinedValue()
{
Value v;
#if CPU(X86_64)
v.val = quint64(_Undefined_Type) << Tag_Shift;
#else
v.tag = _Undefined_Type;
v.int_32 = 0;
#endif
return v;
}
inline Value Value::nullValue()
{
Value v;
#if CPU(X86_64)
v.val = quint64(_Null_Type) << Tag_Shift;
#else
v.tag = _Null_Type;
v.int_32 = 0;
#endif
return v;
}
inline Value Value::fromBoolean(Bool b)
{
Value v;
v.tag = _Boolean_Type;
v.int_32 = (bool)b;
return v;
}
inline Value Value::fromDouble(double d)
{
Value v;
v.dbl = d;
return v;
}
inline Value Value::fromInt32(int i)
{
Value v;
v.tag = _Integer_Type;
v.int_32 = i;
return v;
}
inline Value Value::fromString(String *s)
{
Value v;
#if CPU(X86_64)
v.val = (quint64)s;
v.val |= quint64(_String_Type) << Tag_Shift;
#else
v.tag = _String_Type;
v.s = s;
#endif
return v;
}
inline Value Value::fromObject(Object *o)
{
Value v;
#if CPU(X86_64)
v.val = (quint64)o;
v.val |= quint64(_Object_Type) << Tag_Shift;
#else
v.tag = _Object_Type;
v.o = o;
#endif
return v;
}
inline int Value::toInt32(ExecutionContext *ctx)
{
if (isConvertibleToInt())
return int_32;
double d;
if (isDouble())
d = dbl;
else
d = __qmljs_to_number(*this, ctx);
const double D32 = 4294967296.0;
const double D31 = D32 / 2.0;
if ((d >= -D31 && d < D31))
return static_cast<int>(d);
return Value::toInt32(__qmljs_to_number(*this, ctx));
}
inline unsigned int Value::toUInt32(ExecutionContext *ctx) {
if (isConvertibleToInt())
return (unsigned) int_32;
double d;
if (isDouble())
d = dbl;
else
d = __qmljs_to_number(*this, ctx);
const double D32 = 4294967296.0;
if (dbl >= 0 && dbl < D32)
return static_cast<uint>(dbl);
return toUInt32(d);
}
} // namespace VM
} // namespace QQmlJS
#endif
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