[SANDBOX-319] Cannot pop operand off an empty stack

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Component/s: Javaflow

Environment

Java 6
javaflow svn revision 892381 (http://svn.apache.org/repos/asf/commons/sandbox/javaflow/trunk)
Debian (mix of testing and unstable)

• Assignee: Unassigned
• Reporter: Joshua Ball
• Created: 18/Dec/09 22:00
• Updated: 22/Dec/09 18:56
• Resolved: 22/Dec/09 18:56

Description

Steps to reproduce:

Create the file Example.java:

--------------
import java.util.concurrent.*;

public class Example {
private Executor executor = Executors.newFixedThreadPool(8);
private ScheduledThreadPoolExecutor stpe = new ScheduledThreadPoolExecutor(1);
public ScheduledFuture<?> schedule(final Runnable command, long delay, TimeUnit unit) {
return stpe.schedule(new Runnable() {
public void run()

{ executor.execute(command); }

}, delay, unit);
}
}
--------------

and the file Rewriter.java:

---------------
import org.apache.commons.javaflow.utils.RewritingUtils;
import org.apache.commons.javaflow.bytecode.transformation.ResourceTransformer;
import org.apache.commons.javaflow.bytecode.transformation.asm.AsmClassTransformer;

import java.io.File;

public class Rewriter {
public static void main(String[] args) throws Exception

{ ResourceTransformer transformer = new AsmClassTransformer(); RewritingUtils.rewriteClassFile(new File("Example.class"), transformer, new File("ExampleRewritten.class")); }

}
----------------

Compile:

javac -cp $JAVAFLOW *.java

Run:

java -cp $JAVAFLOW Rewriter

It produces the following error:

org.objectweb.asm.tree.analysis.AnalyzerException: Error at instruction 6: Method owner: expected LExample$1;, but found Ljava/util/concurrent/ScheduledThreadPoolExecutor;
at org.objectweb.asm.tree.analysis.Analyzer.analyze(Unknown Source)
at org.apache.commons.javaflow.bytecode.transformation.asm.ContinuationMethodAnalyzer$2.analyze(ContinuationMethodAnalyzer.java:124)
at org.apache.commons.javaflow.bytecode.transformation.asm.ContinuationMethodAnalyzer.visitEnd(ContinuationMethodAnalyzer.java:135)
at org.objectweb.asm.ClassReader.accept(Unknown Source)
at org.objectweb.asm.ClassReader.accept(Unknown Source)
at org.apache.commons.javaflow.bytecode.transformation.asm.AsmClassTransformer.transform(AsmClassTransformer.java:53)
at org.apache.commons.javaflow.bytecode.transformation.asm.AsmClassTransformer.transform(AsmClassTransformer.java:40)
at org.apache.commons.javaflow.utils.RewritingUtils.rewriteClassFile(RewritingUtils.java:60)
at Rewriter.main(Rewriter.java:10)
Caused by: org.objectweb.asm.tree.analysis.AnalyzerException: Method owner: expected LExample$1;, but found Ljava/util/concurrent/ScheduledThreadPoolExecutor;
at org.objectweb.asm.tree.analysis.BasicVerifier.naryOperation(Unknown Source)
at org.objectweb.asm.tree.analysis.Frame.execute(Unknown Source)
at org.apache.commons.javaflow.bytecode.transformation.asm.MonitoringFrame.execute(MonitoringFrame.java:70)
... 9 more
org.objectweb.asm.tree.analysis.AnalyzerException: Error at instruction 9: Cannot pop operand off an empty stack.
at org.objectweb.asm.tree.analysis.Analyzer.analyze(Unknown Source)
at org.objectweb.asm.util.CheckMethodAdapter$1.visitEnd(Unknown Source)
at org.objectweb.asm.util.CheckMethodAdapter.visitEnd(Unknown Source)
at org.objectweb.asm.tree.MethodNode.accept(Unknown Source)
at org.apache.commons.javaflow.bytecode.transformation.asm.ContinuationMethodAnalyzer.visitEnd(ContinuationMethodAnalyzer.java:141)
at org.objectweb.asm.ClassReader.accept(Unknown Source)
at org.objectweb.asm.ClassReader.accept(Unknown Source)
at org.apache.commons.javaflow.bytecode.transformation.asm.AsmClassTransformer.transform(AsmClassTransformer.java:53)
at org.apache.commons.javaflow.bytecode.transformation.asm.AsmClassTransformer.transform(AsmClassTransformer.java:40)
at org.apache.commons.javaflow.utils.RewritingUtils.rewriteClassFile(RewritingUtils.java:60)
at Rewriter.main(Rewriter.java:10)
Caused by: java.lang.IndexOutOfBoundsException: Cannot pop operand off an empty stack.
at org.objectweb.asm.tree.analysis.Frame.pop(Unknown Source)
at org.objectweb.asm.tree.analysis.Frame.execute(Unknown Source)
... 11 more
Exception in thread "main" java.lang.RuntimeException: Error at instruction 9: Cannot pop operand off an empty stack. schedule(Ljava/lang/Runnable;JLjava/util/concurrent/TimeUnit;)Ljava/util/concurrent/ScheduledFuture;
00000 R R J . R : : L0
00001 R R J . R : : LINENUMBER 7 L0
00002 R R J . R : : ALOAD 0
00003 R R J . R : R : GETFIELD Example.stpe : Ljava/util/concurrent/ScheduledThreadPoolExecutor;
00004 R R J . R : R : ALOAD 0
00005 R R J . R : R R : ALOAD 1
00006 R R J . R : R R R : INVOKESPECIAL Example$1.<init> (LExample;Ljava/lang/Runnable;)V
00007 R R J . R : : NEW Example$1
00008 R R J . R : R : DUP
00009 R R J . R : R R : DUP2_X2
00010 ? : POP2
00011 ? : LLOAD 2
00012 ? : ALOAD 4
00013 ? : L1
00014 ? : INVOKEVIRTUAL java/util/concurrent/ScheduledThreadPoolExecutor.schedule (Ljava/lang/Runnable;JLjava/util/concurrent/TimeUnit;)Ljava/util/concurrent/ScheduledFuture;
00015 ? : ARETURN

at org.objectweb.asm.util.CheckMethodAdapter$1.visitEnd(Unknown Source)
at org.objectweb.asm.util.CheckMethodAdapter.visitEnd(Unknown Source)
at org.objectweb.asm.tree.MethodNode.accept(Unknown Source)
at org.apache.commons.javaflow.bytecode.transformation.asm.ContinuationMethodAnalyzer.visitEnd(ContinuationMethodAnalyzer.java:141)
at org.objectweb.asm.ClassReader.accept(Unknown Source)
at org.objectweb.asm.ClassReader.accept(Unknown Source)
at org.apache.commons.javaflow.bytecode.transformation.asm.AsmClassTransformer.transform(AsmClassTransformer.java:53)
at org.apache.commons.javaflow.bytecode.transformation.asm.AsmClassTransformer.transform(AsmClassTransformer.java:40)
at org.apache.commons.javaflow.utils.RewritingUtils.rewriteClassFile(RewritingUtils.java:60)
at Rewriter.main(Rewriter.java:10)