// 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