Upstream version 9.38.198.0
[platform/framework/web/crosswalk.git] / src / v8 / src / hydrogen-infer-types.cc
1 // Copyright 2013 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "src/hydrogen-infer-types.h"
6
7 namespace v8 {
8 namespace internal {
9
10 void HInferTypesPhase::InferTypes(int from_inclusive, int to_inclusive) {
11   for (int i = from_inclusive; i <= to_inclusive; ++i) {
12     HBasicBlock* block = graph()->blocks()->at(i);
13
14     const ZoneList<HPhi*>* phis = block->phis();
15     for (int j = 0; j < phis->length(); j++) {
16       phis->at(j)->UpdateInferredType();
17     }
18
19     for (HInstructionIterator it(block); !it.Done(); it.Advance()) {
20       it.Current()->UpdateInferredType();
21     }
22
23     if (block->IsLoopHeader()) {
24       HBasicBlock* last_back_edge =
25           block->loop_information()->GetLastBackEdge();
26       InferTypes(i + 1, last_back_edge->block_id());
27       // Skip all blocks already processed by the recursive call.
28       i = last_back_edge->block_id();
29       // Update phis of the loop header now after the whole loop body is
30       // guaranteed to be processed.
31       for (int j = 0; j < block->phis()->length(); ++j) {
32         HPhi* phi = block->phis()->at(j);
33         worklist_.Add(phi, zone());
34         in_worklist_.Add(phi->id());
35       }
36       while (!worklist_.is_empty()) {
37         HValue* current = worklist_.RemoveLast();
38         in_worklist_.Remove(current->id());
39         if (current->UpdateInferredType()) {
40           for (HUseIterator it(current->uses()); !it.Done(); it.Advance()) {
41             HValue* use = it.value();
42             if (!in_worklist_.Contains(use->id())) {
43               in_worklist_.Add(use->id());
44               worklist_.Add(use, zone());
45             }
46           }
47         }
48       }
49       DCHECK(in_worklist_.IsEmpty());
50     }
51   }
52 }
53
54 } }  // namespace v8::internal