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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_TRANSFORM_PROMOTE_INITIALIZERS_TO_LET_H_
#define SRC_TINT_TRANSFORM_PROMOTE_INITIALIZERS_TO_LET_H_
#include "src/tint/transform/transform.h"
namespace tint::transform {
/// A transform that hoists array and structure initializers, and identifiers resolving to a
/// 'const' array to a 'let' variable, declared just before the statement of usage.
/// This transform is used by backends that do not support expressions that operate on an immediate
/// array or structure. For example, the following is not immediately expressable for HLSL:
/// `array<i32, 2>(1, 2)[0]`
/// @see crbug.com/tint/406
class PromoteInitializersToLet final : public Castable<PromoteInitializersToLet, Transform> {
public:
/// Constructor
PromoteInitializersToLet();
/// Destructor
~PromoteInitializersToLet() override;
protected:
/// Runs the transform using the CloneContext built for transforming a
/// program. Run() is responsible for calling Clone() on the CloneContext.
/// @param ctx the CloneContext primed with the input program and
/// ProgramBuilder
/// @param inputs optional extra transform-specific input data
/// @param outputs optional extra transform-specific output data
void Run(CloneContext& ctx, const DataMap& inputs, DataMap& outputs) const override;
};
} // namespace tint::transform
#endif // SRC_TINT_TRANSFORM_PROMOTE_INITIALIZERS_TO_LET_H_