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/*
* Copyright (C) 2014-2019 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. OR
* 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.
*/
#pragma once
#if ENABLE(ASSEMBLER)
#include "MacroAssembler.h"
namespace JSC {
// Reg is a polymorphic register class. It can refer to either integer or float registers.
// Here are some use cases:
//
// GPRReg gpr;
// Reg reg = gpr;
// reg.isSet() == true
// reg.isGPR() == true
// reg.isFPR() == false
//
// for (Reg reg = Reg::first(); reg <= Reg::last(); reg = reg.next()) {
// if (reg.isGPR()) {
// } else /* reg.isFPR() */ {
// }
// }
//
// The above loop could have also used !!reg or reg.isSet() as a condition.
class Reg {
public:
Reg()
: m_index(invalid())
{
}
Reg(WTF::HashTableDeletedValueType)
: m_index(deleted())
{
}
Reg(MacroAssembler::RegisterID reg)
: m_index(MacroAssembler::registerIndex(reg))
{
}
Reg(MacroAssembler::FPRegisterID reg)
: m_index(MacroAssembler::registerIndex(reg))
{
}
static Reg fromIndex(unsigned index)
{
Reg result;
result.m_index = index;
return result;
}
static Reg first()
{
Reg result;
result.m_index = 0;
return result;
}
static Reg last()
{
Reg result;
result.m_index = MacroAssembler::numberOfRegisters() + MacroAssembler::numberOfFPRegisters() - 1;
return result;
}
Reg next() const
{
ASSERT(!!*this);
if (*this == last())
return Reg();
Reg result;
result.m_index = m_index + 1;
return result;
}
unsigned index() const { return m_index; }
static unsigned maxIndex()
{
return last().index();
}
bool isSet() const { return m_index != invalid(); }
explicit operator bool() const { return isSet(); }
bool isHashTableDeletedValue() const { return m_index == deleted(); }
bool isGPR() const
{
return m_index < MacroAssembler::numberOfRegisters();
}
bool isFPR() const
{
return (m_index - MacroAssembler::numberOfRegisters()) < MacroAssembler::numberOfFPRegisters();
}
MacroAssembler::RegisterID gpr() const
{
ASSERT(isGPR());
return static_cast<MacroAssembler::RegisterID>(MacroAssembler::firstRegister() + m_index);
}
MacroAssembler::FPRegisterID fpr() const
{
ASSERT(isFPR());
return static_cast<MacroAssembler::FPRegisterID>(
MacroAssembler::firstFPRegister() + (m_index - MacroAssembler::numberOfRegisters()));
}
bool operator==(const Reg& other) const
{
return m_index == other.m_index;
}
bool operator!=(const Reg& other) const
{
return m_index != other.m_index;
}
bool operator<(const Reg& other) const
{
return m_index < other.m_index;
}
bool operator>(const Reg& other) const
{
return m_index > other.m_index;
}
bool operator<=(const Reg& other) const
{
return m_index <= other.m_index;
}
bool operator>=(const Reg& other) const
{
return m_index >= other.m_index;
}
unsigned hash() const
{
return m_index;
}
const char* debugName() const;
void dump(PrintStream&) const;
class AllRegsIterable {
public:
class iterator {
public:
iterator() { }
explicit iterator(Reg reg)
: m_regIndex(reg.index())
{
}
Reg operator*() const { return Reg::fromIndex(m_regIndex); }
iterator& operator++()
{
m_regIndex = Reg::fromIndex(m_regIndex).next().index();
return *this;
}
bool operator==(const iterator& other) const
{
return m_regIndex == other.m_regIndex;
}
bool operator!=(const iterator& other) const
{
return !(*this == other);
}
private:
unsigned m_regIndex;
};
iterator begin() const { return iterator(Reg::first()); }
iterator end() const { return iterator(Reg()); }
};
static AllRegsIterable all() { return AllRegsIterable(); }
private:
static uint8_t invalid() { return 0xff; }
static uint8_t deleted() { return 0xfe; }
uint8_t m_index;
};
struct RegHash {
static unsigned hash(const Reg& key) { return key.hash(); }
static bool equal(const Reg& a, const Reg& b) { return a == b; }
static constexpr bool safeToCompareToEmptyOrDeleted = true;
};
} // namespace JSC
namespace WTF {
template<typename T> struct DefaultHash;
template<> struct DefaultHash<JSC::Reg> : JSC::RegHash { };
template<typename T> struct HashTraits;
template<> struct HashTraits<JSC::Reg> : SimpleClassHashTraits<JSC::Reg> {
static constexpr bool emptyValueIsZero = false;
};
} // namespace WTF
#endif // ENABLE(ASSEMBLER)