49 lines
2.0 KiB
C++
49 lines
2.0 KiB
C++
// Copyright 2022 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_TRANSFORM_PROMOTE_INITIALIZERS_TO_LET_H_
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#define SRC_TINT_TRANSFORM_PROMOTE_INITIALIZERS_TO_LET_H_
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#include "src/tint/transform/transform.h"
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namespace tint::transform {
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/// A transform that hoists array and structure constructors, and identifiers resolving to a
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/// 'const' array to a 'let' variable, declared just before the statement of usage.
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/// This transform is used by backends that do not support expressions that operate on an immediate
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/// array or structure. For example, the following is not immediately expressable for HLSL:
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/// `array<i32, 2>(1, 2)[0]`
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/// @see crbug.com/tint/406
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class PromoteInitializersToLet final : public Castable<PromoteInitializersToLet, Transform> {
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public:
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/// Constructor
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PromoteInitializersToLet();
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/// Destructor
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~PromoteInitializersToLet() override;
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protected:
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/// Runs the transform using the CloneContext built for transforming a
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/// program. Run() is responsible for calling Clone() on the CloneContext.
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/// @param ctx the CloneContext primed with the input program and
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/// ProgramBuilder
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/// @param inputs optional extra transform-specific input data
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/// @param outputs optional extra transform-specific output data
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void Run(CloneContext& ctx, const DataMap& inputs, DataMap& outputs) const override;
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};
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} // namespace tint::transform
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#endif // SRC_TINT_TRANSFORM_PROMOTE_INITIALIZERS_TO_LET_H_
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