83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
// Copyright 2021 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0(the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_TINT_SEM_CONSTANT_H_
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#define SRC_TINT_SEM_CONSTANT_H_
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#include <variant>
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#include "src/tint/number.h"
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// Forward declarations
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namespace tint::sem {
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class Type;
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}
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namespace tint::sem {
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/// Constant is the interface to a compile-time evaluated expression value.
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class Constant {
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public:
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/// Constructor
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Constant();
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/// Destructor
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virtual ~Constant();
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/// @returns the type of the constant
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virtual const sem::Type* Type() const = 0;
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/// @returns the value of this Constant, if this constant is of a scalar value or abstract
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/// numeric, otherwise std::monostate.
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virtual std::variant<std::monostate, AInt, AFloat> Value() const = 0;
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/// @returns the child constant element with the given index, or nullptr if the constant has no
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/// children, or the index is out of bounds.
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/// For arrays, this returns the i'th element of the array.
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/// For vectors, this returns the i'th element of the vector.
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/// For matrices, this returns the i'th column vector of the matrix.
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/// For structures, this returns the i'th member field of the structure.
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virtual const Constant* Index(size_t) const = 0;
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/// @returns true if child elements of this constant are positive-zero valued.
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virtual bool AllZero() const = 0;
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/// @returns true if any child elements of this constant are positive-zero valued.
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virtual bool AnyZero() const = 0;
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/// @returns true if all child elements of this constant have the same value and type.
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virtual bool AllEqual() const = 0;
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/// @returns a hash of the constant.
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virtual size_t Hash() const = 0;
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/// @returns the value of the constant as the given scalar or abstract value.
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template <typename T>
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T As() const {
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return std::visit(
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[](auto v) {
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if constexpr (std::is_same_v<decltype(v), std::monostate>) {
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return T(0);
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} else {
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return static_cast<T>(v);
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}
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},
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Value());
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}
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};
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} // namespace tint::sem
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#endif // SRC_TINT_SEM_CONSTANT_H_
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