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comparison graal/com.oracle.truffle.ruby.nodes/src/com/oracle/truffle/ruby/nodes/objects/ReadClassVariableNode.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.objects;
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.runtime.*;
17 import com.oracle.truffle.ruby.runtime.core.*;
18
19 @NodeInfo(shortName = "read-class-variable")
20 public class ReadClassVariableNode extends RubyNode {
21
22 protected final String name;
23 @Child protected RubyNode module;
24
25 public ReadClassVariableNode(RubyContext context, SourceSection sourceSection, String name, RubyNode module) {
26 super(context, sourceSection);
27 this.name = name;
28 this.module = adoptChild(module);
29 }
30
31 @Override
32 public Object execute(VirtualFrame frame) {
33 final RubyObject object = (RubyObject) module.execute(frame);
34
35 RubyModule moduleObject;
36
37 // TODO(CS): this cannot be right
38
39 if (object instanceof RubyModule) {
40 moduleObject = (RubyModule) object;
41 } else {
42 moduleObject = object.getRubyClass();
43 }
44
45 final Object value = moduleObject.lookupClassVariable(name);
46
47 if (value == null) {
48 // TODO(CS): is this right?
49 return NilPlaceholder.INSTANCE;
50 }
51
52 return value;
53 }
54
55 @Override
56 public Object isDefined(VirtualFrame frame) {
57 final RubyContext context = getContext();
58
59 final RubyObject object = (RubyObject) module.execute(frame);
60
61 RubyModule moduleObject;
62
63 if (object instanceof RubyModule) {
64 moduleObject = (RubyModule) object;
65 } else {
66 moduleObject = object.getRubyClass();
67 }
68
69 final Object value = moduleObject.lookupClassVariable(name);
70
71 if (value == null) {
72 return NilPlaceholder.INSTANCE;
73 } else {
74 return context.makeString("class variable");
75 }
76 }
77
78 }