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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_function_parameters.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_function_parameters.h"
namespace spvtools {
namespace fuzz {
FuzzerPassPermuteFunctionParameters::FuzzerPassPermuteFunctionParameters(
opt::IRContext* ir_context, TransformationContext* transformation_context,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations)
: FuzzerPass(ir_context, transformation_context, fuzzer_context,
transformations) {}
void FuzzerPassPermuteFunctionParameters::Apply() {
for (const auto& function : *GetIRContext()->module()) {
uint32_t function_id = function.result_id();
// Skip the function if it is an entry point
if (fuzzerutil::FunctionIsEntryPoint(GetIRContext(), function_id)) {
continue;
}
if (!GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfPermutingParameters())) {
continue;
}
// Compute permutation for parameters
auto* function_type =
fuzzerutil::GetFunctionType(GetIRContext(), &function);
assert(function_type && "Function type is null");
// Don't take return type into account
uint32_t arg_size = function_type->NumInOperands() - 1;
// Create a vector, fill it with [0, n-1] values and shuffle it
std::vector<uint32_t> permutation(arg_size);
std::iota(permutation.begin(), permutation.end(), 0);
GetFuzzerContext()->Shuffle(&permutation);
// Apply our transformation
ApplyTransformation(TransformationPermuteFunctionParameters(
function_id, GetFuzzerContext()->GetFreshId(), permutation));
}
}
} // namespace fuzz
} // namespace spvtools
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