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comparison graal/com.oracle.truffle.ruby.nodes/src/com/oracle/truffle/ruby/nodes/control/FlipFlopNode.java @ 13514:0fbee3eb71f0

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Ruby: import project.
author Chris Seaton <chris.seaton@oracle.com>
date Mon, 06 Jan 2014 17:12:09 +0000
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13513:64a23ce736a0 13514:0fbee3eb71f0
1 /*
2 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
3 * code is released under a tri EPL/GPL/LGPL license. You can use it,
4 * redistribute it and/or modify it under the terms of the:
5 *
6 * Eclipse Public License version 1.0
7 * GNU General Public License version 2
8 * GNU Lesser General Public License version 2.1
9 */
10 package com.oracle.truffle.ruby.nodes.control;
11
12 import com.oracle.truffle.api.*;
13 import com.oracle.truffle.api.frame.*;
14 import com.oracle.truffle.api.nodes.*;
15 import com.oracle.truffle.ruby.nodes.*;
16 import com.oracle.truffle.ruby.nodes.cast.*;
17 import com.oracle.truffle.ruby.nodes.methods.locals.*;
18 import com.oracle.truffle.ruby.runtime.*;
19
20 @NodeInfo(shortName = "flip-flop")
21 public class FlipFlopNode extends RubyNode {
22
23 @Child protected BooleanCastNode begin;
24 @Child protected BooleanCastNode end;
25 @Child protected FlipFlopStateNode stateNode;
26
27 private final boolean exclusive;
28
29 public FlipFlopNode(RubyContext context, SourceSection sourceSection, BooleanCastNode begin, BooleanCastNode end, FlipFlopStateNode stateNode, boolean exclusive) {
30 super(context, sourceSection);
31 this.begin = adoptChild(begin);
32 this.end = adoptChild(end);
33 this.stateNode = adoptChild(stateNode);
34 this.exclusive = exclusive;
35 }
36
37 @Override
38 public boolean executeBoolean(VirtualFrame frame) {
39 if (exclusive) {
40 if (stateNode.getState(frame)) {
41 if (end.executeBoolean(frame)) {
42 stateNode.setState(frame, false);
43 }
44
45 return true;
46 } else {
47 final boolean newState = begin.executeBoolean(frame);
48 stateNode.setState(frame, newState);
49 return newState;
50 }
51 } else {
52 if (stateNode.getState(frame)) {
53 if (end.executeBoolean(frame)) {
54 stateNode.setState(frame, false);
55 }
56
57 return true;
58 } else {
59 if (begin.executeBoolean(frame)) {
60 stateNode.setState(frame, !end.executeBoolean(frame));
61 return true;
62 }
63
64 return false;
65 }
66 }
67 }
68
69 @Override
70 public Object execute(VirtualFrame frame) {
71 return executeBoolean(frame);
72 }
73
74 }