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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_REPLACE_LOAD_STORE_WITH_COPY_MEMORY_H_
#define SOURCE_FUZZ_TRANSFORMATION_REPLACE_LOAD_STORE_WITH_COPY_MEMORY_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"
namespace spvtools {
namespace fuzz {
class TransformationReplaceLoadStoreWithCopyMemory : public Transformation {
public:
explicit TransformationReplaceLoadStoreWithCopyMemory(
protobufs::TransformationReplaceLoadStoreWithCopyMemory message);
TransformationReplaceLoadStoreWithCopyMemory(
const protobufs::InstructionDescriptor& load_instruction_descriptor,
const protobufs::InstructionDescriptor& store_instruction_descriptor);
// - |message_.load_instruction_descriptor| must identify an OpLoad
// instruction.
// - |message_.store_instruction_descriptor| must identify an OpStore
// instruction.
// - The OpStore must write the intermediate value loaded by the OpLoad.
// - The OpLoad and the OpStore must not have certain instruction in between
// (checked by IsMemoryWritingOpCode(), IsMemoryBarrierOpCode(),
// IsStorageClassSafeAcrossMemoryBarriers()).
bool IsApplicable(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const override;
// Takes a pair of instruction descriptors to OpLoad and OpStore that have the
// same intermediate value and replaces the OpStore with an equivalent
// OpCopyMemory.
void Apply(opt::IRContext* ir_context,
TransformationContext* transformation_context) const override;
// Checks if the instruction that has an |op_code| might write to
// the source operand of the OpLoad instruction.
static bool IsMemoryWritingOpCode(spv::Op op_code);
// Checks if the instruction that has an |op_code| is a memory barrier that
// could interfere with the source operand of the OpLoad instruction
static bool IsMemoryBarrierOpCode(spv::Op op_code);
// Checks if the |storage_class| of the source operand of the OpLoad
// instruction implies that this variable cannot change (due to other threads)
// across memory barriers.
static bool IsStorageClassSafeAcrossMemoryBarriers(
spv::StorageClass storage_class);
std::unordered_set<uint32_t> GetFreshIds() const override;
protobufs::Transformation ToMessage() const override;
private:
protobufs::TransformationReplaceLoadStoreWithCopyMemory message_;
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_TRANSFORMATION_REPLACE_LOAD_STORE_WITH_COPY_MEMORY_H_
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