Mercurial > hg > Members > kono > jpf-core

comparison src/main/gov/nasa/jpf/listener/StackDepthChecker.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.listener;
19
20 import gov.nasa.jpf.Config;
21 import gov.nasa.jpf.JPF;
22 import gov.nasa.jpf.ListenerAdapter;
23 import gov.nasa.jpf.util.JPFLogger;
24 import gov.nasa.jpf.vm.Instruction;
25 import gov.nasa.jpf.vm.MethodInfo;
26 import gov.nasa.jpf.vm.VM;
27 import gov.nasa.jpf.vm.StackFrame;
28 import gov.nasa.jpf.vm.ThreadInfo;
29
30 /**
31 * listener that throws a java.lang.StackOverflowError in case a thread
32 * exceeds a configured max stack depth
33 *
34 * <2do> - maybe we should only count visible stackframes, i.e. the ones for
35 * which we have invoke insns on the stack
36 */
37 public class StackDepthChecker extends ListenerAdapter {
38
39 static JPFLogger log = JPF.getLogger("gov.nasa.jpf.listener.StackDepthChecker");
40
41 protected int maxDepth;
42
43 public StackDepthChecker (Config config, JPF jpf){
44 maxDepth = config.getInt( "sdc.max_stack_depth", 42);
45 }
46
47 @Override
48 public void methodEntered (VM vm, ThreadInfo thread, MethodInfo mi){
49
50 ThreadInfo ti = ThreadInfo.getCurrentThread();
51 int depth = ti.getStackDepth(); // note this is only an approximation since it also returns natives and overlays
52
53 if (depth > maxDepth){
54 log.info("configured vm.max_stack_depth exceeded: ", depth);
55
56 // NOTE - we get this notification from inside of the InvokeInstruction.enter(),
57 // i.e. before we get the instructionExecuted(). Throwing exceptions is
58 // therefore a bit harder since we have to set the next pc explicitly
59
60 Instruction nextPc = ti.createAndThrowException("java.lang.StackOverflowError");
61 StackFrame topFrame = ti.getModifiableTopFrame();
62 topFrame.setPC(nextPc);
63 }
64 }
65 }