Source Code Cross Referenced for Label.java in  » Scripting » Kawa » gnu » bytecode » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » Kawa » gnu.bytecode 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        // Copyright (c) 1997, 2004  Per M.A. Bothner.
02:        // This is free software;  for terms and warranty disclaimer see ./COPYING.
03:
04:        package gnu.bytecode;
05:
06:        /**
07:         * A Label represents a location in a Code attribute.
08:         */
09:
10:        public class Label {
11:
12:            /** Offset in the fixup_offsets and fixup_labels arrays.
13:             * The offset corresponds to the fixup itself. */
14:            int first_fixup;
15:
16:            /** The PC of where the label is, or -1 if not yet defined.
17:             * This PC may be tentative if we later run processFixups.
18:             * The offset in the code array is cattr.fixupOffset(first_fixup). */
19:            int position;
20:
21:            public final boolean defined() {
22:                return position >= 0;
23:            }
24:
25:            public Label() {
26:                position = -1;
27:            }
28:
29:            public Label(CodeAttr code) {
30:                position = -1;
31:            }
32:
33:            public Label(int position) {
34:                this .position = position;
35:            }
36:
37:            /**
38:             * Define the value of a label as having the current location.
39:             * @param code the "Code" attribute of the current method
40:             */
41:            public void define(CodeAttr code) {
42:                code.setReachable(true);
43:                if (position >= 0)
44:                    throw new Error("label definition more than once");
45:
46:                position = code.PC;
47:                first_fixup = code.fixup_count;
48:                code.fixupAdd(CodeAttr.FIXUP_DEFINE, this);
49:            }
50:
51:        }
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