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/*
* Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef Register_h
#define Register_h
#include "JSCJSValue.h"
#include <wtf/Assertions.h>
#include <wtf/VectorTraits.h>
namespace JSC {
class CodeBlock;
class ExecState;
class JSLexicalEnvironment;
class JSObject;
class JSScope;
typedef ExecState CallFrame;
class Register {
WTF_MAKE_FAST_ALLOCATED;
public:
Register();
Register(const JSValue&);
Register& operator=(const JSValue&);
JSValue jsValue() const;
JSValue asanUnsafeJSValue() const;
EncodedJSValue encodedJSValue() const;
Register& operator=(CallFrame*);
Register& operator=(CodeBlock*);
Register& operator=(JSScope*);
Register& operator=(JSObject*);
int32_t i() const;
CallFrame* callFrame() const;
CodeBlock* codeBlock() const;
CodeBlock* asanUnsafeCodeBlock() const;
JSObject* object() const;
JSScope* scope() const;
int32_t unboxedInt32() const;
int64_t unboxedInt52() const;
int64_t unboxedStrictInt52() const;
bool unboxedBoolean() const;
double unboxedDouble() const;
JSCell* unboxedCell() const;
int32_t payload() const;
int32_t tag() const;
int32_t unsafeTag() const;
int32_t& payload();
int32_t& tag();
static Register withInt(int32_t i)
{
Register r = jsNumber(i);
return r;
}
private:
union {
EncodedJSValue value;
CallFrame* callFrame;
CodeBlock* codeBlock;
EncodedValueDescriptor encodedValue;
double number;
int64_t integer;
} u;
};
ALWAYS_INLINE Register::Register()
{
#ifndef NDEBUG
*this = JSValue();
#endif
}
ALWAYS_INLINE Register::Register(const JSValue& v)
{
u.value = JSValue::encode(v);
}
ALWAYS_INLINE Register& Register::operator=(const JSValue& v)
{
u.value = JSValue::encode(v);
return *this;
}
// FIXME (rdar://problem/19379214): ASan only needs to be suppressed for Register::jsValue() when called from prepareOSREntry(), but there is currently no way to express this short of adding a separate copy of the function.
SUPPRESS_ASAN ALWAYS_INLINE JSValue Register::asanUnsafeJSValue() const
{
return JSValue::decode(u.value);
}
ALWAYS_INLINE JSValue Register::jsValue() const
{
return JSValue::decode(u.value);
}
ALWAYS_INLINE EncodedJSValue Register::encodedJSValue() const
{
return u.value;
}
// Interpreter functions
ALWAYS_INLINE Register& Register::operator=(CallFrame* callFrame)
{
u.callFrame = callFrame;
return *this;
}
ALWAYS_INLINE Register& Register::operator=(CodeBlock* codeBlock)
{
u.codeBlock = codeBlock;
return *this;
}
ALWAYS_INLINE int32_t Register::i() const
{
return jsValue().asInt32();
}
ALWAYS_INLINE CallFrame* Register::callFrame() const
{
return u.callFrame;
}
ALWAYS_INLINE CodeBlock* Register::codeBlock() const
{
return u.codeBlock;
}
SUPPRESS_ASAN ALWAYS_INLINE CodeBlock* Register::asanUnsafeCodeBlock() const
{
return u.codeBlock;
}
ALWAYS_INLINE int32_t Register::unboxedInt32() const
{
return payload();
}
ALWAYS_INLINE int64_t Register::unboxedInt52() const
{
return u.integer >> JSValue::int52ShiftAmount;
}
ALWAYS_INLINE int64_t Register::unboxedStrictInt52() const
{
return u.integer;
}
ALWAYS_INLINE bool Register::unboxedBoolean() const
{
return !!payload();
}
ALWAYS_INLINE double Register::unboxedDouble() const
{
return u.number;
}
ALWAYS_INLINE JSCell* Register::unboxedCell() const
{
#if USE(JSVALUE64)
return u.encodedValue.ptr;
#else
return bitwise_cast<JSCell*>(payload());
#endif
}
ALWAYS_INLINE int32_t Register::payload() const
{
return u.encodedValue.asBits.payload;
}
ALWAYS_INLINE int32_t Register::tag() const
{
return u.encodedValue.asBits.tag;
}
SUPPRESS_ASAN ALWAYS_INLINE int32_t Register::unsafeTag() const
{
return u.encodedValue.asBits.tag;
}
ALWAYS_INLINE int32_t& Register::payload()
{
return u.encodedValue.asBits.payload;
}
ALWAYS_INLINE int32_t& Register::tag()
{
return u.encodedValue.asBits.tag;
}
} // namespace JSC
namespace WTF {
template<> struct VectorTraits<JSC::Register> : VectorTraitsBase<true, JSC::Register> { };
} // namespace WTF
#endif // Register_h
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