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// Copyright 2022 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SRC_TINT_CONSTANT_COMPOSITE_H_
#define SRC_TINT_CONSTANT_COMPOSITE_H_
#include "src/tint/castable.h"
#include "src/tint/constant/value.h"
#include "src/tint/number.h"
#include "src/tint/type/type.h"
#include "src/tint/utils/hash.h"
#include "src/tint/utils/vector.h"
namespace tint::constant {
/// Composite holds a number of mixed child values.
/// Composite may be of a vector, matrix or array type.
/// If each element is the same type and value, then a Splat would be a more efficient constant
/// implementation. Use CreateComposite() to create the appropriate type.
class Composite : public Castable<Composite, constant::Value> {
public:
/// Constructor
/// @param t the compsite type
/// @param els the composite elements
/// @param all_0 true if all elements are 0
/// @param any_0 true if any element is 0
Composite(const type::Type* t,
utils::VectorRef<const constant::Value*> els,
bool all_0,
bool any_0);
~Composite() override;
const type::Type* Type() const override { return type; }
const constant::Value* Index(size_t i) const override {
return i < elements.Length() ? elements[i] : nullptr;
}
bool AllZero() const override { return all_zero; }
bool AnyZero() const override { return any_zero; }
bool AllEqual() const override { return false; }
size_t Hash() const override { return hash; }
/// The composite type
type::Type const* const type;
/// The composite elements
const utils::Vector<const constant::Value*, 4> elements;
/// True if all elements are zero
const bool all_zero;
/// True if any element is zero
const bool any_zero;
/// The hash of the composite
const size_t hash;
protected:
std::variant<std::monostate, AInt, AFloat> InternalValue() const override { return {}; }
private:
size_t CalcHash() {
auto h = utils::Hash(type, all_zero, any_zero);
for (auto* el : elements) {
h = utils::HashCombine(h, el->Hash());
}
return h;
}
};
} // namespace tint::constant
#endif // SRC_TINT_CONSTANT_COMPOSITE_H_