| // 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_parameter_with_global.h" |
| |
| #include <numeric> |
| #include <vector> |
| |
| #include "source/fuzz/fuzzer_context.h" |
| #include "source/fuzz/fuzzer_util.h" |
| #include "source/fuzz/transformation_replace_parameter_with_global.h" |
| |
| namespace spvtools { |
| namespace fuzz { |
| |
| FuzzerPassReplaceParameterWithGlobal::FuzzerPassReplaceParameterWithGlobal( |
| 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 FuzzerPassReplaceParameterWithGlobal::Apply() { |
| for (const auto& function : *GetIRContext()->module()) { |
| if (fuzzerutil::FunctionIsEntryPoint(GetIRContext(), |
| function.result_id())) { |
| continue; |
| } |
| |
| if (!GetFuzzerContext()->ChoosePercentage( |
| GetFuzzerContext()->GetChanceOfReplacingParametersWithGlobals())) { |
| continue; |
| } |
| |
| auto params = |
| fuzzerutil::GetParameters(GetIRContext(), function.result_id()); |
| |
| // Make sure at least one parameter can be replaced. Also checks that the |
| // function has at least one parameter. |
| if (std::none_of(params.begin(), params.end(), |
| [this](const opt::Instruction* param) { |
| return TransformationReplaceParameterWithGlobal:: |
| IsParameterTypeSupported(GetIRContext(), |
| param->type_id()); |
| })) { |
| continue; |
| } |
| |
| // Select id of a parameter to replace. |
| const opt::Instruction* replaced_param; |
| uint32_t param_type_id; |
| do { |
| replaced_param = GetFuzzerContext()->RemoveAtRandomIndex(¶ms); |
| param_type_id = replaced_param->type_id(); |
| assert(param_type_id && "Parameter has invalid type"); |
| } while ( |
| !TransformationReplaceParameterWithGlobal::IsParameterTypeSupported( |
| GetIRContext(), param_type_id)); |
| |
| assert(replaced_param && "Unable to find a parameter to replace"); |
| |
| // Make sure type id for the global variable exists in the module. |
| FindOrCreatePointerType(replaced_param->type_id(), SpvStorageClassPrivate); |
| |
| // Make sure initializer for the global variable exists in the module. |
| FindOrCreateZeroConstant(replaced_param->type_id(), false); |
| |
| ApplyTransformation(TransformationReplaceParameterWithGlobal( |
| GetFuzzerContext()->GetFreshId(), replaced_param->result_id(), |
| GetFuzzerContext()->GetFreshId())); |
| } |
| } |
| |
| } // namespace fuzz |
| } // namespace spvtools |