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comparison graal/com.oracle.truffle.ruby.nodes/src/com/oracle/truffle/ruby/nodes/control/TryNode.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.api.utilities.*;
16 import com.oracle.truffle.ruby.nodes.*;
17 import com.oracle.truffle.ruby.runtime.*;
18 import com.oracle.truffle.ruby.runtime.control.*;
19 import com.oracle.truffle.ruby.runtime.objects.*;
20
21 /**
22 * Represents a block of code run with exception handlers. There's no {@code try} keyword in Ruby -
23 * it's implicit - but it's similar to a try statement in any other language.
24 */
25 @NodeInfo(shortName = "try")
26 public class TryNode extends RubyNode {
27
28 @Child protected RubyNode tryPart;
29 @Children final RescueNode[] rescueParts;
30 @Child protected RubyNode elsePart;
31
32 private final BranchProfile controlFlowProfile = new BranchProfile();
33
34 public TryNode(RubyContext context, SourceSection sourceSection, RubyNode tryPart, RescueNode[] rescueParts, RubyNode elsePart) {
35 super(context, sourceSection);
36 this.tryPart = adoptChild(tryPart);
37 this.rescueParts = adoptChildren(rescueParts);
38 this.elsePart = adoptChild(elsePart);
39 }
40
41 @Override
42 public Object execute(VirtualFrame frame) {
43 while (true) {
44 try {
45 final Object result = tryPart.execute(frame);
46 elsePart.executeVoid(frame);
47 return result;
48 } catch (ControlFlowException exception) {
49 controlFlowProfile.enter();
50
51 throw exception;
52 } catch (RuntimeException exception) {
53 CompilerDirectives.transferToInterpreter();
54
55 try {
56 return handleException(frame, exception);
57 } catch (RetryException e) {
58 continue;
59 }
60 }
61 }
62 }
63
64 private Object handleException(VirtualFrame frame, RuntimeException exception) {
65 CompilerAsserts.neverPartOfCompilation();
66
67 final RubyContext context = getContext();
68
69 final RubyBasicObject rubyException = ExceptionTranslator.translateException(context, exception);
70
71 context.getCoreLibrary().getGlobalVariablesObject().setInstanceVariable("$!", rubyException);
72
73 for (RescueNode rescue : rescueParts) {
74 if (rescue.canHandle(frame, rubyException)) {
75 return rescue.execute(frame);
76 }
77 }
78
79 throw exception;
80 }
81
82 }