StackMapFrame


1   /**
2    * ASM: a very small and fast Java bytecode manipulation framework
3    * Copyright (c) 2000-2005 INRIA, France Telecom
4    * All rights reserved.
5    *
6    * Redistribution and use in source and binary forms, with or without
7    * modification, are permitted provided that the following conditions
8    * are met:
9    * 1. Redistributions of source code must retain the above copyright
10   *    notice, this list of conditions and the following disclaimer.
11   * 2. Redistributions in binary form must reproduce the above copyright
12   *    notice, this list of conditions and the following disclaimer in the
13   *    documentation and/or other materials provided with the distribution.
14   * 3. Neither the name of the copyright holders nor the names of its
15   *    contributors may be used to endorse or promote products derived from
16   *    this software without specific prior written permission.
17   *
18   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28   * THE POSSIBILITY OF SUCH DAMAGE.
29   */
30  package org.objectweb.asm.attrs;
31  
32  import java.util.List  ;
33  
34  import org.objectweb.asm.Label;
35  
36  /**
37   * Holds the state of the stack and local variables for a single execution
38   * branch.
39   * 
40   * <i>Note that Long and Double types are represented by two entries in locals
41   * and stack. Second entry should be always of type Top.</i>
42   * 
43   * @see <a HREF="http://www.jcp.org/en/jsr/detail?id=139">JSR 139 : Connected
44   *      Limited Device Configuration 1.1</a>
45   * 
46   * @see "ClassFileFormat-Java6.fm Page 138 Friday, April 15, 2005 3:22 PM"
47   * 
48   * @author Eugene Kuleshov
49   */
50  public class StackMapFrame {
51  
52      /**
53       * A <code>Label</code> for frame offset within method bytecode.
54       */
55      public Label label;
56  
57      /**
58       * A List of <code>StackMapType</code> instances that represent locals for
59       * this frame.
60       */
61      public List   locals;
62  
63      /**
64       * A List of <code>StackMapType</code> instances that represent stack for
65       * this frame.
66       */
67      public List   stack;
68  
69      public StackMapFrame(Label label, List   locals, List   stack) {
70          this.label = label;
71          this.locals = locals;
72          this.stack = stack;
73      }
74  
75      public String   toString() {
76          StringBuffer   sb = new StringBuffer  ("Frame:L");
77          sb.append(System.identityHashCode(label));
78          sb.append(" locals").append(locals);
79          sb.append(" stack").append(stack);
80          return sb.toString();
81      }
82  }
83
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