| // 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_copy_memory.h" |
| |
| #include "source/fuzz/fuzzer_context.h" |
| #include "source/fuzz/fuzzer_util.h" |
| #include "source/fuzz/instruction_descriptor.h" |
| #include "source/fuzz/transformation_add_copy_memory.h" |
| |
| namespace spvtools { |
| namespace fuzz { |
| |
| FuzzerPassAddCopyMemory::FuzzerPassAddCopyMemory( |
| 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 FuzzerPassAddCopyMemory::Apply() { |
| ForEachInstructionWithInstructionDescriptor( |
| [this](opt::Function* function, opt::BasicBlock* block, |
| opt::BasicBlock::iterator inst_it, |
| const protobufs::InstructionDescriptor& instruction_descriptor) { |
| // Check that we can insert an OpCopyMemory before this instruction. |
| if (!fuzzerutil::CanInsertOpcodeBeforeInstruction(SpvOpCopyMemory, |
| inst_it)) { |
| return; |
| } |
| |
| if (!GetFuzzerContext()->ChoosePercentage( |
| GetFuzzerContext()->GetChanceOfAddingCopyMemory())) { |
| return; |
| } |
| |
| // Get all instructions available before |inst_it| according to the |
| // domination rules. |
| auto instructions = FindAvailableInstructions( |
| function, block, inst_it, |
| TransformationAddCopyMemory::IsInstructionSupported); |
| |
| if (instructions.empty()) { |
| return; |
| } |
| |
| const auto* inst = |
| instructions[GetFuzzerContext()->RandomIndex(instructions)]; |
| |
| // Decide whether to create global or local variable. |
| auto storage_class = GetFuzzerContext()->ChooseEven() |
| ? SpvStorageClassPrivate |
| : SpvStorageClassFunction; |
| |
| auto pointee_type_id = fuzzerutil::GetPointeeTypeIdFromPointerType( |
| GetIRContext(), inst->type_id()); |
| |
| // Create a pointer type with |storage_class| if needed. |
| FindOrCreatePointerType(pointee_type_id, storage_class); |
| |
| ApplyTransformation(TransformationAddCopyMemory( |
| instruction_descriptor, GetFuzzerContext()->GetFreshId(), |
| inst->result_id(), storage_class, |
| FindOrCreateZeroConstant(pointee_type_id, false))); |
| }); |
| } |
| |
| } // namespace fuzz |
| } // namespace spvtools |