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/*
* Copyright (c) 2023 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
#include <wtf/FixedVector.h>
namespace WGSL {
struct Type;
// A constant value might be:
// - a scalar
// - a vector
// - a matrix
// - a fixed-size array type
// - a structure
struct ConstantValue;
struct ConstantArray {
ConstantArray(size_t size)
: elements(size)
{
}
ConstantArray(FixedVector<ConstantValue>&& elements)
: elements(WTFMove(elements))
{
}
FixedVector<ConstantValue> elements;
};
struct ConstantVector {
ConstantVector(size_t size)
: elements(size)
{
}
ConstantVector(FixedVector<ConstantValue>&& elements)
: elements(WTFMove(elements))
{
}
FixedVector<ConstantValue> elements;
};
using BaseValue = std::variant<double, int64_t, bool, ConstantArray, ConstantVector>;
struct ConstantValue : BaseValue {
ConstantValue() = default;
template<typename T>
ConstantValue(const Type* type, T&& value)
: BaseValue(std::forward<T>(value))
, type(type)
{
}
static void constructDeletedValue(ConstantValue& slot)
{
slot.type = bitwise_cast<Type*>(static_cast<intptr_t>(-1));
}
static bool isDeletedValue(const ConstantValue& value)
{
return value.type == bitwise_cast<Type*>(static_cast<intptr_t>(-1));
}
void dump(PrintStream&) const;
bool isNumber() const
{
return std::holds_alternative<int64_t>(*this) || std::holds_alternative<double>(*this);
}
double toDouble() const
{
ASSERT(isNumber());
if (std::holds_alternative<double>(*this))
return std::get<double>(*this);
return static_cast<double>(std::get<int64_t>(*this));
}
const Type* type;
};
} // namespace WGSL
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