| // Copyright (c) 2017 Google Inc. |
| // |
| // 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/opt/compact_ids_pass.h" |
| |
| #include <cassert> |
| #include <unordered_map> |
| |
| #include "source/opt/ir_context.h" |
| |
| namespace spvtools { |
| namespace opt { |
| namespace { |
| |
| // Returns the remapped id of |id| from |result_id_mapping|. If the remapped |
| // id does not exist, adds a new one to |result_id_mapping| and returns it. |
| uint32_t GetRemappedId( |
| std::unordered_map<uint32_t, uint32_t>* result_id_mapping, uint32_t id) { |
| auto it = result_id_mapping->find(id); |
| if (it == result_id_mapping->end()) { |
| const uint32_t new_id = |
| static_cast<uint32_t>(result_id_mapping->size()) + 1; |
| const auto insertion_result = result_id_mapping->emplace(id, new_id); |
| it = insertion_result.first; |
| assert(insertion_result.second); |
| } |
| return it->second; |
| } |
| |
| } // namespace |
| |
| Pass::Status CompactIdsPass::Process() { |
| bool modified = false; |
| std::unordered_map<uint32_t, uint32_t> result_id_mapping; |
| |
| context()->module()->ForEachInst( |
| [&result_id_mapping, &modified](Instruction* inst) { |
| auto operand = inst->begin(); |
| while (operand != inst->end()) { |
| const auto type = operand->type; |
| if (spvIsIdType(type)) { |
| assert(operand->words.size() == 1); |
| uint32_t& id = operand->words[0]; |
| uint32_t new_id = GetRemappedId(&result_id_mapping, id); |
| if (id != new_id) { |
| modified = true; |
| id = new_id; |
| // Update data cached in the instruction object. |
| if (type == SPV_OPERAND_TYPE_RESULT_ID) { |
| inst->SetResultId(id); |
| } else if (type == SPV_OPERAND_TYPE_TYPE_ID) { |
| inst->SetResultType(id); |
| } |
| } |
| } |
| ++operand; |
| } |
| |
| uint32_t scope_id = inst->GetDebugScope().GetLexicalScope(); |
| if (scope_id != kNoDebugScope) { |
| uint32_t new_id = GetRemappedId(&result_id_mapping, scope_id); |
| if (scope_id != new_id) { |
| inst->UpdateLexicalScope(new_id); |
| modified = true; |
| } |
| } |
| uint32_t inlinedat_id = inst->GetDebugInlinedAt(); |
| if (inlinedat_id != kNoInlinedAt) { |
| uint32_t new_id = GetRemappedId(&result_id_mapping, inlinedat_id); |
| if (inlinedat_id != new_id) { |
| inst->UpdateDebugInlinedAt(new_id); |
| modified = true; |
| } |
| } |
| }, |
| true); |
| |
| if (modified) { |
| context()->module()->SetIdBound( |
| static_cast<uint32_t>(result_id_mapping.size() + 1)); |
| // There are ids in the feature manager that could now be invalid |
| context()->ResetFeatureManager(); |
| } |
| |
| return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange; |
| } |
| |
| } // namespace opt |
| } // namespace spvtools |