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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_SEM_ARRAY_COUNT_H_
#define SRC_TINT_SEM_ARRAY_COUNT_H_
#include <string>
#include "src/tint/sem/expression.h"
#include "src/tint/sem/variable.h"
#include "src/tint/type/array_count.h"
namespace tint::sem {
/// The variant of an ArrayCount when the count is a named override variable.
/// Example:
/// ```
/// override N : i32;
/// type arr = array<i32, N>
/// ```
class NamedOverrideArrayCount final : public Castable<NamedOverrideArrayCount, type::ArrayCount> {
public:
/// Constructor
/// @param var the `override` variable
explicit NamedOverrideArrayCount(const GlobalVariable* var);
~NamedOverrideArrayCount() override;
/// @returns a hash of the array count.
size_t Hash() const override;
/// @param t other array count
/// @returns true if this array count is equal to the given array count
bool Equals(const type::ArrayCount& t) const override;
/// @param symbols the symbol table
/// @returns the friendly name for this array count
std::string FriendlyName(const SymbolTable& symbols) const override;
/// The `override` variable.
const GlobalVariable* variable;
};
/// The variant of an ArrayCount when the count is an unnamed override variable.
/// Example:
/// ```
/// override N : i32;
/// type arr = array<i32, N*2>
/// ```
class UnnamedOverrideArrayCount final
: public Castable<UnnamedOverrideArrayCount, type::ArrayCount> {
public:
/// Constructor
/// @param e the override expression
explicit UnnamedOverrideArrayCount(const Expression* e);
~UnnamedOverrideArrayCount() override;
/// @returns a hash of the array count.
size_t Hash() const override;
/// @param t other array count
/// @returns true if this array count is equal to the given array count
bool Equals(const type::ArrayCount& t) const override;
/// @param symbols the symbol table
/// @returns the friendly name for this array count
std::string FriendlyName(const SymbolTable& symbols) const override;
/// The unnamed override expression.
/// Note: Each AST expression gets a unique semantic expression node, so two equivalent AST
/// expressions will not result in the same `expr` pointer. This property is important to ensure
/// that two array declarations with equivalent AST expressions do not compare equal.
/// For example, consider:
/// ```
/// override size : u32;
/// var<workgroup> a : array<f32, size * 2>;
/// var<workgroup> b : array<f32, size * 2>;
/// ```
// The array count for `a` and `b` have equivalent AST expressions, but the types for `a` and
// `b` must not compare equal.
const Expression* expr;
};
} // namespace tint::sem
#endif // SRC_TINT_SEM_ARRAY_COUNT_H_