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// Copyright 2021 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_TRANSFORM_WRAP_ARRAYS_IN_STRUCTS_H_
#define SRC_TRANSFORM_WRAP_ARRAYS_IN_STRUCTS_H_
#include <string>
#include <unordered_map>
#include "src/transform/transform.h"
// Forward declarations
namespace tint {
namespace ast {
class Type;
} // namespace ast
} // namespace tint
namespace tint {
namespace transform {
/// WrapArraysInStructs is a transform that replaces all array types with a
/// structure holding a single field of that array type.
/// Array index expressions and constructors are also adjusted to deal with this
/// wrapping.
/// This transform helps with backends that cannot directly return arrays or use
/// them as parameters.
class WrapArraysInStructs : public Castable<WrapArraysInStructs, Transform> {
public:
/// Constructor
WrapArraysInStructs();
/// Destructor
~WrapArraysInStructs() 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) override;
private:
struct WrappedArrayInfo {
WrappedArrayInfo();
WrappedArrayInfo(const WrappedArrayInfo&);
~WrappedArrayInfo();
Symbol wrapper_name;
std::function<const ast::Type*(CloneContext&)> array_type;
operator bool() { return wrapper_name.IsValid(); }
};
/// WrapArray wraps the fixed-size array type in a new structure (if it hasn't
/// already been wrapped). WrapArray will recursively wrap arrays-of-arrays.
/// The new structure will be added to module-scope type declarations of
/// `ctx.dst`.
/// @param ctx the CloneContext
/// @param wrapped_arrays a map of src array type to the wrapped structure
/// name
/// @param array the array type
/// @return the name of the structure that wraps the array, or an invalid
/// Symbol if this array should not be wrapped
WrappedArrayInfo WrapArray(
CloneContext& ctx,
std::unordered_map<const sem::Array*, WrappedArrayInfo>& wrapped_arrays,
const sem::Array* array) const;
};
} // namespace transform
} // namespace tint
#endif // SRC_TRANSFORM_WRAP_ARRAYS_IN_STRUCTS_H_