src/tint/lang/wgsl/ast/type.h

// Copyright 2023 The Dawn & Tint Authors
//
// 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.
//
// 3. Neither the name of the copyright holder nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT HOLDER 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.

#ifndef SRC_TINT_LANG_WGSL_AST_TYPE_H_
#define SRC_TINT_LANG_WGSL_AST_TYPE_H_

#include "src/tint/utils/id/generation_id.h"

// Forward declarations
namespace tint::ast {
class IdentifierExpression;
}  // namespace tint::ast

namespace tint::ast {

/// Type is a thin wrapper around an IdentifierExpression, to help statically disambiguate known
/// type expressions from other expressions.
struct Type {
    /// The type expression
    const IdentifierExpression* expr = nullptr;

    /// Indirection operator for accessing the type's expression
    /// @return #expr
    const IdentifierExpression* operator->() const { return expr; }

    /// Implicit conversion operator to the type's expression
    /// @return #expr
    operator const IdentifierExpression*() const { return expr; }
};

}  // namespace tint::ast

namespace tint {

/// @param type an AST type
/// @returns the GenerationID of the given AST type.
GenerationID GenerationIDOf(ast::Type type);

}  // namespace tint

#endif  // SRC_TINT_LANG_WGSL_AST_TYPE_H_