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Issue 21065003: Turn mark deoptimize on undefined into a proper HPhase. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Addressed comments Created 7 years, 4 months ago
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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-mark-deoptimize.h"
29
30 namespace v8 {
31 namespace internal {
32
33 void HMarkDeoptimizeOnUndefinedPhase::Run() {
34 const ZoneList<HPhi*>* phi_list = graph()->phi_list();
35 for (int i = 0; i < phi_list->length(); i++) {
36 HPhi* phi = phi_list->at(i);
37 if (phi->CheckFlag(HValue::kAllowUndefinedAsNaN)) {
38 for (HUseIterator it(phi->uses()); !it.Done(); it.Advance()) {
39 HValue* use_value = it.value();
40 if (!use_value->CheckFlag(HValue::kAllowUndefinedAsNaN)) {
41 ProcessPhi(phi);
42 break;
43 }
44 }
45 }
46 }
47 }
48
49
50 void HMarkDeoptimizeOnUndefinedPhase::ProcessPhi(HPhi* phi) {
51 ASSERT(phi->CheckFlag(HValue::kAllowUndefinedAsNaN));
52 ASSERT(worklist_.is_empty());
53
54 // Push the phi onto the worklist
55 phi->ClearFlag(HValue::kAllowUndefinedAsNaN);
56 worklist_.Add(phi, zone());
57
58 // Process all phis that can reach this phi
59 while (!worklist_.is_empty()) {
60 phi = worklist_.RemoveLast();
61 for (int i = phi->OperandCount() - 1; i >= 0; --i) {
62 HValue* input = phi->OperandAt(i);
63 if (input->IsPhi() && input->CheckFlag(HValue::kAllowUndefinedAsNaN)) {
64 input->ClearFlag(HValue::kAllowUndefinedAsNaN);
65 worklist_.Add(HPhi::cast(input), zone());
66 }
67 }
68 }
69 }
70
71 } } // namespace v8::internal
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