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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_BUILTIN_POLYFILL_H_
#define SRC_TINT_TRANSFORM_BUILTIN_POLYFILL_H_
#include "src/tint/transform/transform.h"
namespace tint::transform {
/// Implements builtins for backends that do not have a native implementation.
class BuiltinPolyfill final : public Castable<BuiltinPolyfill, Transform> {
public:
/// Constructor
BuiltinPolyfill();
/// Destructor
~BuiltinPolyfill() override;
/// Enumerator of polyfill levels
enum class Level {
/// No polyfill needed, supported by the backend.
kNone,
/// Clamp the parameters to the inner implementation.
kClampParameters,
/// Polyfill the entire function
kFull,
};
/// Specifies the builtins that should be polyfilled by the transform.
struct Builtins {
/// Should `countLeadingZeros()` be polyfilled?
bool count_leading_zeros = false;
/// Should `countTrailingZeros()` be polyfilled?
bool count_trailing_zeros = false;
/// What level should `extractBits()` be polyfilled?
Level extract_bits = Level::kNone;
/// Should `firstLeadingBit()` be polyfilled?
bool first_leading_bit = false;
/// Should `firstTrailingBit()` be polyfilled?
bool first_trailing_bit = false;
/// Should `insertBits()` be polyfilled?
Level insert_bits = Level::kNone;
};
/// Config is consumed by the BuiltinPolyfill transform.
/// Config specifies the builtins that should be polyfilled.
struct Config final : public Castable<Data, transform::Data> {
/// Constructor
/// @param b the list of builtins to polyfill
explicit Config(const Builtins& b);
/// Copy constructor
Config(const Config&);
/// Destructor
~Config() override;
/// The builtins to polyfill
const Builtins builtins;
};
/// @param program the program to inspect
/// @param data optional extra transform-specific input data
/// @returns true if this transform should be run for the given program
bool ShouldRun(const Program* program,
const DataMap& data = {}) const override;
protected:
struct State;
/// 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_BUILTIN_POLYFILL_H_