57 lines
2.1 KiB
C++
57 lines
2.1 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_TRANSFORM_SIMPLIFY_POINTERS_H_
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#define SRC_TINT_TRANSFORM_SIMPLIFY_POINTERS_H_
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#include "src/tint/transform/transform.h"
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namespace tint::transform {
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/// SimplifyPointers is a Transform that moves all usage of function-scope
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/// `let` statements of a pointer type into their places of usage, while also
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/// simplifying any chains of address-of or indirections operators.
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///
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/// Parameters of a pointer type are not adjusted.
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///
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/// Note: SimplifyPointers does not operate on module-scope `let`s, as these
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/// cannot be pointers: https://gpuweb.github.io/gpuweb/wgsl/#module-constants
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/// `A module-scope let-declared constant must be of constructible type.`
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///
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/// @note Depends on the following transforms to have been run first:
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/// * Unshadow
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class SimplifyPointers final : public Castable<SimplifyPointers, Transform> {
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public:
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/// Constructor
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SimplifyPointers();
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/// Destructor
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~SimplifyPointers() override;
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protected:
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struct State;
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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_SIMPLIFY_POINTERS_H_
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