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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_MUTATE_POINTER_H_
#define SOURCE_FUZZ_TRANSFORMATION_MUTATE_POINTER_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 TransformationMutatePointer : public Transformation {
public:
explicit TransformationMutatePointer(
protobufs::TransformationMutatePointer message);
explicit TransformationMutatePointer(
uint32_t pointer_id, uint32_t fresh_id,
const protobufs::InstructionDescriptor& insert_before);
// - |fresh_id| must be fresh.
// - |insert_before| must be a valid instruction descriptor of some
// instruction in the module.
// - It should be possible to insert OpLoad and OpStore before
// |insert_before|.
// - |pointer_id| must be a result id of some instruction in the module.
// - Instruction with result id |pointer_id| must be valid (see
// IsValidPointerInstruction method).
// - There must exist an irrelevant constant in the module. Type of the
// constant must be equal to the type of the |pointer_id|'s pointee.
// - |pointer_id| must be available (according to the dominance rules) before
// |insert_before|.
bool IsApplicable(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const override;
// Inserts the following instructions before |insert_before|:
// %fresh_id = OpLoad %pointee_type_id %pointer_id
// OpStore %pointer_id %constant_id
// OpStore %pointer_id %fresh_id
void Apply(opt::IRContext* ir_context,
TransformationContext* transformation_context) const override;
std::unordered_set<uint32_t> GetFreshIds() const override;
protobufs::Transformation ToMessage() const override;
// Returns true if |inst| valid pointer according to the following:
// - |inst| has result id and type id.
// - |inst| is neither OpUndef nor OpConstantNull.
// - |inst| has a pointer type.
// - |inst|'s storage class is either Private, Function or Workgroup.
// - |inst|'s pointee type and all its constituents are either scalar or
// composite.
static bool IsValidPointerInstruction(opt::IRContext* ir_context,
const opt::Instruction& inst);
private:
protobufs::TransformationMutatePointer message_;
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_TRANSFORMATION_MUTATE_POINTER_H_
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