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// Copyright (c) 2019 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_VECTOR_SHUFFLE_H_
#define SOURCE_FUZZ_TRANSFORMATION_VECTOR_SHUFFLE_H_
#include "source/fuzz/protobufs/spirvfuzz_protobufs.h"
#include "source/fuzz/transformation.h"
#include "source/fuzz/transformation_context.h"
#include "source/opt/ir_context.h"
#include "source/opt/types.h"
namespace spvtools {
namespace fuzz {
class TransformationVectorShuffle : public Transformation {
public:
explicit TransformationVectorShuffle(
const protobufs::TransformationVectorShuffle& message);
TransformationVectorShuffle(
const protobufs::InstructionDescriptor& instruction_to_insert_before,
uint32_t fresh_id, uint32_t vector1, uint32_t vector2,
const std::vector<uint32_t>& component);
// - |message_.fresh_id| must not be in use
// - |message_.instruction_to_insert_before| must identify an instruction
// before which it is legitimate to insert an OpVectorShuffle
// - |message_.vector1| and |message_.vector2| must be instructions of vector
// type, and the element types of these vectors must be the same
// - Each element of |message_.component| must either be 0xFFFFFFFF
// (representing an undefined component), or must be less than the combined
// sizes of the input vectors
// - The module must already contain a vector type with the same element type
// as |message_.vector1| and |message_.vector2|, and with the size of
// |message_component| as its element count
bool IsApplicable(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const override;
// Inserts an OpVectorShuffle instruction before
// |message_.instruction_to_insert_before|, shuffles vectors
// |message_.vector1| and |message_.vector2| using the indices provided by
// |message_.component|, into |message_.fresh_id|.
//
// If |message_.fresh_id| is irrelevant (e.g. due to being in a dead block)
// of if one of |message_.vector1| or |message_.vector2| is irrelevant and the
// shuffle reads components from the irrelevant vector then no synonym facts
// are added.
//
// Otherwise, a fact is added recording that element of |message_.fresh_id| is
// synonymous with the element of |message_.vector1| or |message_.vector2|
// from which it came (with undefined components being ignored).
void Apply(opt::IRContext* ir_context,
TransformationContext* transformation_context) const override;
std::unordered_set<uint32_t> GetFreshIds() const override;
protobufs::Transformation ToMessage() const override;
private:
// Returns a type id that already exists in |ir_context| suitable for
// representing the result of the shuffle, where |element_type| is known to
// be the common element type of the vectors to which the shuffle is being
// applied. Returns 0 if no such id exists.
uint32_t GetResultTypeId(opt::IRContext* ir_context,
const opt::analysis::Type& element_type) const;
// Returns the type associated with |id_of_vector| in |ir_context|.
static opt::analysis::Vector* GetVectorType(opt::IRContext* ir_context,
uint32_t id_of_vector);
// Helper method for adding data synonym facts when applying the
// transformation to |ir_context| and |transformation_context|.
void AddDataSynonymFacts(opt::IRContext* ir_context,
TransformationContext* transformation_context) const;
protobufs::TransformationVectorShuffle message_;
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_TRANSFORMATION_VECTOR_SHUFFLE_H_
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