SPIRV-Tools/source/fuzz/fuzzer_pass_add_parameters.cpp
2020-07-11 07:43:06 +01:00

94 lines
3.3 KiB
C++

// 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_add_parameters.h"
#include "source/fuzz/fuzzer_context.h"
#include "source/fuzz/fuzzer_util.h"
#include "source/fuzz/instruction_descriptor.h"
#include "source/fuzz/transformation_add_parameter.h"
namespace spvtools {
namespace fuzz {
FuzzerPassAddParameters::FuzzerPassAddParameters(
opt::IRContext* ir_context, TransformationContext* transformation_context,
FuzzerContext* fuzzer_context,
protobufs::TransformationSequence* transformations)
: FuzzerPass(ir_context, transformation_context, fuzzer_context,
transformations) {}
FuzzerPassAddParameters::~FuzzerPassAddParameters() = default;
void FuzzerPassAddParameters::Apply() {
// Compute type candidates for the new parameter.
std::vector<uint32_t> type_candidates;
for (const auto& type_inst : GetIRContext()->module()->GetTypes()) {
const auto* type =
GetIRContext()->get_type_mgr()->GetType(type_inst->result_id());
assert(type && "Type instruction is not registered in the type manager");
if (TransformationAddParameter::IsParameterTypeSupported(*type)) {
type_candidates.push_back(type_inst->result_id());
}
}
if (type_candidates.empty()) {
// The module contains no suitable types to use in new parameters.
return;
}
// Iterate over all functions in the module.
for (const auto& function : *GetIRContext()->module()) {
// Skip all entry-point functions - we don't want to change those.
if (fuzzerutil::FunctionIsEntryPoint(GetIRContext(),
function.result_id())) {
continue;
}
if (GetNumberOfParameters(function) >=
GetFuzzerContext()->GetMaximumNumberOfFunctionParameters()) {
continue;
}
if (!GetFuzzerContext()->ChoosePercentage(
GetFuzzerContext()->GetChanceOfAddingParameters())) {
continue;
}
auto num_new_parameters =
GetFuzzerContext()->GetRandomNumberOfNewParameters(
GetNumberOfParameters(function));
for (uint32_t i = 0; i < num_new_parameters; ++i) {
ApplyTransformation(TransformationAddParameter(
function.result_id(), GetFuzzerContext()->GetFreshId(),
FindOrCreateZeroConstant(
type_candidates[GetFuzzerContext()->RandomIndex(
type_candidates)]),
GetFuzzerContext()->GetFreshId()));
}
}
}
uint32_t FuzzerPassAddParameters::GetNumberOfParameters(
const opt::Function& function) const {
const auto* type = GetIRContext()->get_type_mgr()->GetType(
function.DefInst().GetSingleWordInOperand(1));
assert(type && type->AsFunction());
return static_cast<uint32_t>(type->AsFunction()->param_types().size());
}
} // namespace fuzz
} // namespace spvtools