Mercurial > hg > Members > kono > jpf-core

comparison src/main/gov/nasa/jpf/jvm/bytecode/JSR.java @ 0:61d41facf527

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initial v8 import (history reset)
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
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1 /*
2 * Copyright (C) 2014, United States Government, as represented by the
3 * Administrator of the National Aeronautics and Space Administration.
4 * All rights reserved.
5 *
6 * The Java Pathfinder core (jpf-core) platform is licensed under the
7 * Apache License, Version 2.0 (the "License"); you may not use this file except
8 * in compliance with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0.
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package gov.nasa.jpf.jvm.bytecode;
19
20 import gov.nasa.jpf.vm.Instruction;
21 import gov.nasa.jpf.vm.StackFrame;
22 import gov.nasa.jpf.vm.ThreadInfo;
23
24
25 /**
26 * Jump subroutine
27 * ... => ..., address
28 */
29 public class JSR extends Instruction implements JVMInstruction {
30 private int target;
31
32 public JSR(int targetPc){
33 target = targetPc;
34 }
35
36 @Override
37 public Instruction execute (ThreadInfo ti) {
38 StackFrame frame = ti.getModifiableTopFrame();
39
40 int tgtAdr = getNext(ti).getPosition();
41
42 frame.push( tgtAdr);
43
44 return mi.getInstructionAt(target);
45 }
46
47 @Override
48 public int getLength() {
49 return 3; // opcode, bb1, bb2
50 }
51
52 @Override
53 public int getByteCode () {
54 return 0xA8;
55 }
56
57 @Override
58 public void accept(JVMInstructionVisitor insVisitor) {
59 insVisitor.visit(this);
60 }
61
62 public int getTarget() {
63 return target;
64 }
65
66 }