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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_EQUATION_INSTRUCTION_H_
#define SOURCE_FUZZ_TRANSFORMATION_EQUATION_INSTRUCTION_H_
#include <vector>
#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 TransformationEquationInstruction : public Transformation {
public:
explicit TransformationEquationInstruction(
protobufs::TransformationEquationInstruction message);
TransformationEquationInstruction(
uint32_t fresh_id, SpvOp opcode,
const std::vector<uint32_t>& in_operand_id,
const protobufs::InstructionDescriptor& instruction_to_insert_before);
// - |message_.fresh_id| must be fresh.
// - |message_.instruction_to_insert_before| must identify an instruction
// before which an equation instruction can legitimately be inserted.
// - Each id in |message_.in_operand_id| must exist, not be an OpUndef, and
// be available before |message_.instruction_to_insert_before|.
// - |message_.opcode| must be an opcode for which we know how to handle
// equations, the types of the ids in |message_.in_operand_id| must be
// suitable for use with this opcode, and the module must contain an
// appropriate result type id.
bool IsApplicable(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const override;
// Adds an instruction to the module, right before
// |message_.instruction_to_insert_before|, of the form:
//
// |message_.fresh_id| = |message_.opcode| %type |message_.in_operand_ids|
//
// where %type is a type id that already exists in the module and that is
// compatible with the opcode and input operands.
//
// The fact manager is also updated to inform it of this equation fact.
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 type id for the equation instruction. Returns 0 if result type does
// not exist.
uint32_t MaybeGetResultTypeId(opt::IRContext* ir_context) const;
protobufs::TransformationEquationInstruction message_;
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_TRANSFORMATION_EQUATION_INSTRUCTION_H_
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