mstarzinger@chromium.org | e0e1b0d | 2013-07-08 08:38:06 +0000 | [diff] [blame] | 1 | // Copyright 2013 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #include "hydrogen-infer-types.h" |
| 29 | |
| 30 | namespace v8 { |
| 31 | namespace internal { |
| 32 | |
| 33 | void HInferTypesPhase::InferTypes(int from_inclusive, int to_inclusive) { |
| 34 | for (int i = from_inclusive; i <= to_inclusive; ++i) { |
| 35 | HBasicBlock* block = graph()->blocks()->at(i); |
| 36 | |
| 37 | const ZoneList<HPhi*>* phis = block->phis(); |
| 38 | for (int j = 0; j < phis->length(); j++) { |
| 39 | phis->at(j)->UpdateInferredType(); |
| 40 | } |
| 41 | |
| 42 | for (HInstructionIterator it(block); !it.Done(); it.Advance()) { |
| 43 | it.Current()->UpdateInferredType(); |
| 44 | } |
| 45 | |
| 46 | if (block->IsLoopHeader()) { |
| 47 | HBasicBlock* last_back_edge = |
| 48 | block->loop_information()->GetLastBackEdge(); |
| 49 | InferTypes(i + 1, last_back_edge->block_id()); |
| 50 | // Skip all blocks already processed by the recursive call. |
| 51 | i = last_back_edge->block_id(); |
| 52 | // Update phis of the loop header now after the whole loop body is |
| 53 | // guaranteed to be processed. |
| 54 | for (int j = 0; j < block->phis()->length(); ++j) { |
| 55 | HPhi* phi = block->phis()->at(j); |
| 56 | worklist_.Add(phi, zone()); |
| 57 | in_worklist_.Add(phi->id()); |
| 58 | } |
| 59 | while (!worklist_.is_empty()) { |
| 60 | HValue* current = worklist_.RemoveLast(); |
| 61 | in_worklist_.Remove(current->id()); |
| 62 | if (current->UpdateInferredType()) { |
| 63 | for (HUseIterator it(current->uses()); !it.Done(); it.Advance()) { |
| 64 | HValue* use = it.value(); |
| 65 | if (!in_worklist_.Contains(use->id())) { |
| 66 | in_worklist_.Add(use->id()); |
| 67 | worklist_.Add(use, zone()); |
| 68 | } |
| 69 | } |
| 70 | } |
| 71 | } |
| 72 | ASSERT(in_worklist_.IsEmpty()); |
| 73 | } |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | } } // namespace v8::internal |