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/*
* Copyright (C) 2015-2023 Apple Inc. All rights reserved.
* Copyright (C) 2021 Igalia S.L. 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(WEBASSEMBLY)
#include "FPRInfo.h"
#include "GPRInfo.h"
#include "Reg.h"
#include <wtf/PrintStream.h>
#include <wtf/TZoneMalloc.h>
namespace JSC {
namespace Wasm {
class ValueLocation {
WTF_MAKE_TZONE_ALLOCATED(ValueLocation);
public:
enum Kind : uint8_t {
GPRRegister,
FPRRegister,
Stack,
StackArgument,
};
ValueLocation()
: m_kind(GPRRegister)
{
}
explicit ValueLocation(JSValueRegs regs)
: m_kind(GPRRegister)
{
u.jsr = regs;
}
explicit ValueLocation(FPRReg reg)
: m_kind(FPRRegister)
{
u.fpr = reg;
}
static ValueLocation stack(intptr_t offsetFromFP)
{
ValueLocation result;
result.m_kind = Stack;
result.u.offsetFromFP = offsetFromFP;
return result;
}
static ValueLocation stackArgument(intptr_t offsetFromSP)
{
ValueLocation result;
result.m_kind = StackArgument;
result.u.offsetFromSP = offsetFromSP;
return result;
}
Kind kind() const { return m_kind; }
bool isGPR() const { return kind() == GPRRegister; }
bool isFPR() const { return kind() == FPRRegister; }
bool isStack() const { return kind() == Stack; }
bool isStackArgument() const { return kind() == StackArgument; }
JSValueRegs jsr() const
{
ASSERT(isGPR());
return u.jsr;
}
FPRReg fpr() const
{
ASSERT(isFPR());
return u.fpr;
}
intptr_t offsetFromFP() const
{
ASSERT(isStack());
return u.offsetFromFP;
}
intptr_t offsetFromSP() const
{
ASSERT(isStackArgument());
return u.offsetFromSP;
}
JS_EXPORT_PRIVATE void dump(PrintStream&) const;
private:
union U {
JSValueRegs jsr;
FPRReg fpr;
intptr_t offsetFromFP;
intptr_t offsetFromSP;
U()
{
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
memset(static_cast<void*>(this), 0, sizeof(*this));
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
}
} u;
Kind m_kind;
};
} } // namespace JSC::Wasm
namespace WTF {
template<>
struct VectorTraits<JSC::Wasm::ValueLocation> : VectorTraitsBase<false, JSC::Wasm::ValueLocation> {
static constexpr bool canInitializeWithMemset = true;
static constexpr bool canMoveWithMemcpy = true;
static constexpr bool canCopyWithMemcpy = true;
};
void printInternal(PrintStream&, JSC::Wasm::ValueLocation::Kind);
} // namespace WTF
#endif // ENABLE(WEBASSEMBLY)
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