| // Copyright (c) 2019 Google LLC |
| // |
| // 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/id_use_descriptor.h" |
| |
| namespace spvtools { |
| namespace fuzz { |
| |
| opt::Instruction* transformation::FindInstruction( |
| const protobufs::IdUseDescriptor& descriptor, |
| spvtools::opt::IRContext* context) { |
| for (auto& function : *context->module()) { |
| for (auto& block : function) { |
| bool found_base = block.id() == descriptor.base_instruction_result_id(); |
| uint32_t num_ignored = 0; |
| for (auto& instruction : block) { |
| if (instruction.HasResultId() && |
| instruction.result_id() == |
| descriptor.base_instruction_result_id()) { |
| assert(!found_base && |
| "It should not be possible to find the base instruction " |
| "multiple times."); |
| found_base = true; |
| assert(num_ignored == 0 && |
| "The skipped instruction count should only be incremented " |
| "after the instruction base has been found."); |
| } |
| if (found_base && |
| instruction.opcode() == descriptor.target_instruction_opcode()) { |
| if (num_ignored == descriptor.num_opcodes_to_ignore()) { |
| if (descriptor.in_operand_index() >= instruction.NumInOperands()) { |
| return nullptr; |
| } |
| auto in_operand = |
| instruction.GetInOperand(descriptor.in_operand_index()); |
| if (in_operand.type != SPV_OPERAND_TYPE_ID) { |
| return nullptr; |
| } |
| if (in_operand.words[0] != descriptor.id_of_interest()) { |
| return nullptr; |
| } |
| return &instruction; |
| } |
| num_ignored++; |
| } |
| } |
| if (found_base) { |
| // We found the base instruction, but did not find the target |
| // instruction in the same block. |
| return nullptr; |
| } |
| } |
| } |
| return nullptr; |
| } |
| |
| protobufs::IdUseDescriptor transformation::MakeIdUseDescriptor( |
| uint32_t id_of_interest, SpvOp target_instruction_opcode, |
| uint32_t in_operand_index, uint32_t base_instruction_result_id, |
| uint32_t num_opcodes_to_ignore) { |
| protobufs::IdUseDescriptor result; |
| result.set_id_of_interest(id_of_interest); |
| result.set_target_instruction_opcode(target_instruction_opcode); |
| result.set_in_operand_index(in_operand_index); |
| result.set_base_instruction_result_id(base_instruction_result_id); |
| result.set_num_opcodes_to_ignore(num_opcodes_to_ignore); |
| return result; |
| } |
| |
| } // namespace fuzz |
| } // namespace spvtools |