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// Copyright (c) 2020 Google LLC
//
// 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 SOURCE_FUZZ_TRANSFORMATION_ADD_OPPHI_SYNONYM_H_
#define SOURCE_FUZZ_TRANSFORMATION_ADD_OPPHI_SYNONYM_H_
#include "source/fuzz/transformation.h"
namespace spvtools {
namespace fuzz {
class TransformationAddOpPhiSynonym : public Transformation {
public:
explicit TransformationAddOpPhiSynonym(
const protobufs::TransformationAddOpPhiSynonym& message);
TransformationAddOpPhiSynonym(
uint32_t block_id, const std::map<uint32_t, uint32_t>& preds_to_ids,
uint32_t fresh_id);
// - |message_.block_id| is the label of a block with at least one
// predecessor.
// - |message_.pred_to_id| contains a mapping from each of the predecessors of
// the block to an id that is available at the end of the predecessor.
// - All the ids corresponding to a predecessor in |message_.pred_to_id|:
// - have been recorded as synonymous and all have the same type.
// TODO(https://github.com/KhronosGroup/SPIRV-Tools/issues/3726): if a
// predecessor is a dead block, any id of the right type could be used,
// even if it is not synonym with the others.
// - have one of the following types: Bool, Integer, Float, Vector, Matrix,
// Array, Struct. Pointer types are also allowed if the VariablePointers
// capability is enabled and the storage class is Workgroup or
// StorageBuffer.
// - |message_.fresh_id| is a fresh id.
bool IsApplicable(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const override;
// Given a block with n predecessors, with n >= 1, and n corresponding
// synonymous ids of the same type, each available to use at the end of the
// corresponding predecessor, adds an OpPhi instruction at the beginning of
// the block of the form:
// %fresh_id = OpPhi %type %id_1 %pred_1 %id_2 %pred_2 ... %id_n %pred_n
// This instruction is then marked as synonymous with the ids.
void Apply(opt::IRContext* ir_context,
TransformationContext* transformation_context) const override;
// Returns true if |type_id| is the id of a type in the module, which is one
// of the following: Bool, Integer, Float, Vector, Matrix, Array, Struct.
// Pointer types are also allowed if the VariablePointers capability is
// enabled and the storage class is Workgroup or StorageBuffer.
static bool CheckTypeIsAllowed(opt::IRContext* ir_context, uint32_t type_id);
protobufs::Transformation ToMessage() const override;
private:
protobufs::TransformationAddOpPhiSynonym message_;
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_TRANSFORMATION_ADD_OPPHI_SYNONYM_H_
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