| // Copyright 2013 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/crankshaft/hydrogen-infer-types.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| void HInferTypesPhase::InferTypes(int from_inclusive, int to_inclusive) { |
| for (int i = from_inclusive; i <= to_inclusive; ++i) { |
| HBasicBlock* block = graph()->blocks()->at(i); |
| |
| const ZoneList<HPhi*>* phis = block->phis(); |
| for (int j = 0; j < phis->length(); j++) { |
| phis->at(j)->UpdateInferredType(); |
| } |
| |
| for (HInstructionIterator it(block); !it.Done(); it.Advance()) { |
| it.Current()->UpdateInferredType(); |
| } |
| |
| if (block->IsLoopHeader()) { |
| HBasicBlock* last_back_edge = |
| block->loop_information()->GetLastBackEdge(); |
| InferTypes(i + 1, last_back_edge->block_id()); |
| // Skip all blocks already processed by the recursive call. |
| i = last_back_edge->block_id(); |
| // Update phis of the loop header now after the whole loop body is |
| // guaranteed to be processed. |
| for (int j = 0; j < block->phis()->length(); ++j) { |
| HPhi* phi = block->phis()->at(j); |
| worklist_.Add(phi, zone()); |
| in_worklist_.Add(phi->id()); |
| } |
| while (!worklist_.is_empty()) { |
| HValue* current = worklist_.RemoveLast(); |
| in_worklist_.Remove(current->id()); |
| if (current->UpdateInferredType()) { |
| for (HUseIterator it(current->uses()); !it.Done(); it.Advance()) { |
| HValue* use = it.value(); |
| if (!in_worklist_.Contains(use->id())) { |
| in_worklist_.Add(use->id()); |
| worklist_.Add(use, zone()); |
| } |
| } |
| } |
| } |
| DCHECK(in_worklist_.IsEmpty()); |
| } |
| } |
| } |
| |
| } // namespace internal |
| } // namespace v8 |