Mercurial > hg > Members > kono > jpf-core
view src/main/gov/nasa/jpf/listener/StackDepthChecker.java @ 0:61d41facf527
initial v8 import (history reset)
author | Peter Mehlitz <Peter.C.Mehlitz@nasa.gov> |
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date | Fri, 23 Jan 2015 10:14:01 -0800 |
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/* * Copyright (C) 2014, United States Government, as represented by the * Administrator of the National Aeronautics and Space Administration. * All rights reserved. * * The Java Pathfinder core (jpf-core) platform is licensed under the * Apache License, Version 2.0 (the "License"); you may not use this file except * in compliance with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0. * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package gov.nasa.jpf.listener; import gov.nasa.jpf.Config; import gov.nasa.jpf.JPF; import gov.nasa.jpf.ListenerAdapter; import gov.nasa.jpf.util.JPFLogger; import gov.nasa.jpf.vm.Instruction; import gov.nasa.jpf.vm.MethodInfo; import gov.nasa.jpf.vm.VM; import gov.nasa.jpf.vm.StackFrame; import gov.nasa.jpf.vm.ThreadInfo; /** * listener that throws a java.lang.StackOverflowError in case a thread * exceeds a configured max stack depth * * <2do> - maybe we should only count visible stackframes, i.e. the ones for * which we have invoke insns on the stack */ public class StackDepthChecker extends ListenerAdapter { static JPFLogger log = JPF.getLogger("gov.nasa.jpf.listener.StackDepthChecker"); protected int maxDepth; public StackDepthChecker (Config config, JPF jpf){ maxDepth = config.getInt( "sdc.max_stack_depth", 42); } @Override public void methodEntered (VM vm, ThreadInfo thread, MethodInfo mi){ ThreadInfo ti = ThreadInfo.getCurrentThread(); int depth = ti.getStackDepth(); // note this is only an approximation since it also returns natives and overlays if (depth > maxDepth){ log.info("configured vm.max_stack_depth exceeded: ", depth); // NOTE - we get this notification from inside of the InvokeInstruction.enter(), // i.e. before we get the instructionExecuted(). Throwing exceptions is // therefore a bit harder since we have to set the next pc explicitly Instruction nextPc = ti.createAndThrowException("java.lang.StackOverflowError"); StackFrame topFrame = ti.getModifiableTopFrame(); topFrame.setPC(nextPc); } } }