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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.
#include "source/fuzz/fuzzer_pass_permute_phi_operands.h"
#include <numeric>
#include <vector>
#include "source/fuzz/fuzzer_context.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
#include "source/fuzz/transformation_permute_phi_operands.h"
namespace spvtools {
namespace fuzz {
FuzzerPassPermutePhiOperands::FuzzerPassPermutePhiOperands(
opt::IRContext* ir_context, TransformationContext* transformation_context,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations,
bool ignore_inapplicable_transformations)
: FuzzerPass(ir_context, transformation_context, fuzzer_context,
transformations, ignore_inapplicable_transformations) {}
void FuzzerPassPermutePhiOperands::Apply() {
ForEachInstructionWithInstructionDescriptor(
[this](opt::Function* /*unused*/, opt::BasicBlock* /*unused*/,
opt::BasicBlock::iterator inst_it,
const protobufs::InstructionDescriptor& /*unused*/) {
const auto& inst = *inst_it;
if (inst.opcode() != SpvOpPhi) {
return;
}
if (!GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfPermutingPhiOperands())) {
return;
}
// Create a vector of indices for each pair of operands in the |inst|.
// OpPhi always has an even number of operands.
std::vector<uint32_t> permutation(inst.NumInOperands() / 2);
std::iota(permutation.begin(), permutation.end(), 0);
GetFuzzerContext()->Shuffle(&permutation);
ApplyTransformation(TransformationPermutePhiOperands(
inst.result_id(), std::move(permutation)));
});
}
} // namespace fuzz
} // namespace spvtools
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