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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_replace_params_with_struct.h"
#include <numeric>
#include <vector>
#include "source/fuzz/fuzzer_context.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/transformation_replace_params_with_struct.h"
namespace spvtools {
namespace fuzz {
FuzzerPassReplaceParamsWithStruct::FuzzerPassReplaceParamsWithStruct(
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 FuzzerPassReplaceParamsWithStruct::Apply() {
for (const auto& function : *GetIRContext()->module()) {
auto params =
fuzzerutil::GetParameters(GetIRContext(), function.result_id());
if (params.empty() || fuzzerutil::FunctionIsEntryPoint(
GetIRContext(), function.result_id())) {
continue;
}
if (!GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfReplacingParametersWithStruct())) {
continue;
}
std::vector<uint32_t> parameter_index(params.size());
std::iota(parameter_index.begin(), parameter_index.end(), 0);
// Remove the indices of unsupported parameters.
auto new_end =
std::remove_if(parameter_index.begin(), parameter_index.end(),
[this, ¶ms](uint32_t index) {
return !TransformationReplaceParamsWithStruct::
IsParameterTypeSupported(GetIRContext(),
params[index]->type_id());
});
// std::remove_if changes the vector so that removed elements are placed at
// the end (i.e. [new_end, parameter_index.end()) is a range of removed
// elements). However, the size of the vector is not changed so we need to
// change that explicitly by popping those elements from the vector.
parameter_index.erase(new_end, parameter_index.end());
if (parameter_index.empty()) {
continue;
}
// Select |num_replaced_params| parameters at random. We shuffle the vector
// of indices for randomization and shrink it to select first
// |num_replaced_params| parameters.
auto num_replaced_params = std::min<size_t>(
parameter_index.size(),
GetFuzzerContext()->GetRandomNumberOfParametersReplacedWithStruct(
static_cast<uint32_t>(params.size())));
GetFuzzerContext()->Shuffle(¶meter_index);
parameter_index.resize(num_replaced_params);
// Make sure OpTypeStruct exists in the module.
std::vector<uint32_t> component_type_ids;
for (auto index : parameter_index) {
component_type_ids.push_back(params[index]->type_id());
}
FindOrCreateStructType(component_type_ids);
// Map parameters' indices to parameters' ids.
std::vector<uint32_t> parameter_id;
for (auto index : parameter_index) {
parameter_id.push_back(params[index]->result_id());
}
std::map<uint32_t, uint32_t> caller_id_to_fresh_id;
for (const auto* inst :
fuzzerutil::GetCallers(GetIRContext(), function.result_id())) {
caller_id_to_fresh_id[inst->result_id()] =
GetFuzzerContext()->GetFreshId();
}
ApplyTransformation(TransformationReplaceParamsWithStruct(
parameter_id, GetFuzzerContext()->GetFreshId(),
GetFuzzerContext()->GetFreshId(), caller_id_to_fresh_id));
}
}
} // namespace fuzz
} // namespace spvtools
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