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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_DUPLICATE_REGION_WITH_SELECTION_H_
#define SOURCE_FUZZ_TRANSFORMATION_DUPLICATE_REGION_WITH_SELECTION_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 TransformationDuplicateRegionWithSelection : public Transformation {
public:
explicit TransformationDuplicateRegionWithSelection(
const protobufs::TransformationDuplicateRegionWithSelection& message);
explicit TransformationDuplicateRegionWithSelection(
uint32_t new_entry_fresh_id, uint32_t condition_id,
uint32_t merge_label_fresh_id, uint32_t entry_block_id,
uint32_t exit_block_id,
const std::map<uint32_t, uint32_t>& original_label_to_duplicate_label,
const std::map<uint32_t, uint32_t>& original_id_to_duplicate_id,
const std::map<uint32_t, uint32_t>& original_id_to_phi_id);
// - |new_entry_fresh_id|, |merge_label_fresh_id| must be fresh and distinct.
// - |condition_id| must refer to a valid instruction of boolean type.
// - |entry_block_id| and |exit_block_id| must refer to valid blocks and they
// must form a single-entry, single-exit region. Its constructs and their
// merge blocks must be either wholly within or wholly outside of the
// region.
// - |original_label_to_duplicate_label| must contain at least a key for every
// block in the original region.
// - |original_id_to_duplicate_id| must contain at least a key for every
// result id in the original region.
// - |original_id_to_phi_id| must contain at least a key for every result id
// available at the end of the original region.
// - In each of these three maps, each value must be a distinct, fresh id.
bool IsApplicable(
opt::IRContext* ir_context,
const TransformationContext& transformation_context) const override;
// A transformation that inserts a conditional statement with a boolean
// expression of arbitrary value and duplicates a given single-entry,
// single-exit region, so that it is present in each conditional branch and
// will be executed regardless of which branch will be taken.
void Apply(opt::IRContext* ir_context,
TransformationContext* transformation_context) const override;
// Returns the set of blocks dominated by |entry_block| and post-dominated
// by |exit_block|.
static std::set<opt::BasicBlock*> GetRegionBlocks(
opt::IRContext* ir_context, opt::BasicBlock* entry_block,
opt::BasicBlock* exit_block);
// Returns true if and only if |instr| is available at the end of the region
// for which |exit_block| is the final block.
static bool AvailableAfterRegion(const opt::Instruction& instr,
opt::BasicBlock* exit_block,
opt::IRContext* ir_context);
// Returns true if and only if |instr| is valid as an argument to an OpPhi
// instruction.
static bool ValidOpPhiArgument(const opt::Instruction& instr,
opt::IRContext* ir_context);
std::unordered_set<uint32_t> GetFreshIds() const override;
protobufs::Transformation ToMessage() const override;
private:
protobufs::TransformationDuplicateRegionWithSelection message_;
};
} // namespace fuzz
} // namespace spvtools
#endif // SOURCE_FUZZ_TRANSFORMATION_DUPLICATE_REGION_WITH_SELECTION_H_
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