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// Copyright (c) 2020 Vasyl Teliman
//
// 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_MOVE_INSTRUCTION_DOWN_H_
#define SOURCE_FUZZ_TRANSFORMATION_MOVE_INSTRUCTION_DOWN_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 TransformationMoveInstructionDown : public Transformation {
public:
explicit TransformationMoveInstructionDown(
protobufs::TransformationMoveInstructionDown message);
explicit TransformationMoveInstructionDown(
const protobufs::InstructionDescriptor& instruction);
// - |instruction| should be a descriptor of a valid instruction in the module
// - |instruction|'s opcode should be supported by this transformation
// - neither |instruction| nor its successor may be the last instruction in
// the block
// - |instruction|'s successor may not be dependent on the |instruction|
// - it should be possible to insert |instruction|'s opcode after its
// successor
bool IsApplicable(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const override;
// Swaps |instruction| with its successor.
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 true if the |inst| is supported by this transformation.
static bool IsInstructionSupported(opt::IRContext* ir_context,
const opt::Instruction& inst);
// Returns true if |inst| represents a "simple" instruction. That is, it
// neither reads from nor writes to the memory and is not a barrier.
static bool IsSimpleInstruction(opt::IRContext* ir_context,
const opt::Instruction& inst);
// Returns true if |inst| reads from memory.
static bool IsMemoryReadInstruction(opt::IRContext* ir_context,
const opt::Instruction& inst);
// Returns id being used by |inst| to read from. |inst| must be a memory read
// instruction (see IsMemoryReadInstruction). Returned id is not guaranteed to
// have pointer type.
static uint32_t GetMemoryReadTarget(opt::IRContext* ir_context,
const opt::Instruction& inst);
// Returns true if |inst| that writes to the memory.
static bool IsMemoryWriteInstruction(opt::IRContext* ir_context,
const opt::Instruction& inst);
// Returns id being used by |inst| to write into. |inst| must be a memory
// write instruction (see IsMemoryWriteInstruction). Returned id is not
// guaranteed to have pointer type.
static uint32_t GetMemoryWriteTarget(opt::IRContext* ir_context,
const opt::Instruction& inst);
// Returns true if |inst| either reads from or writes to the memory
// (see IsMemoryReadInstruction and IsMemoryWriteInstruction accordingly).
static bool IsMemoryInstruction(opt::IRContext* ir_context,
const opt::Instruction& inst);
// Returns true if |inst| is a barrier instruction.
static bool IsBarrierInstruction(const opt::Instruction& inst);
// Returns true if it is possible to swap |a| and |b| without changing the
// module's semantics. |a| and |b| are required to be supported instructions
// (see IsInstructionSupported). In particular, if either |a| or |b| are
// memory or barrier instructions, some checks are used to only say that they
// can be swapped if the swap is definitely semantics-preserving.
static bool CanSafelySwapInstructions(opt::IRContext* ir_context,
const opt::Instruction& a,
const opt::Instruction& b,
const FactManager& fact_manager);
protobufs::TransformationMoveInstructionDown message_;
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_TRANSFORMATION_MOVE_INSTRUCTION_DOWN_H_
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