This is not a problem of ASM version, I've hit the same bug:
http://issues.apache.org/jira/browse/SANDBOX-318
The issue is related with constructor invocation in method instrumented by
AsmClassTransformer (problem does not exists with BcelClassTransformer)
> >> private void echo(int x) {
> >> System.out.println("echo " + x);
> >> Continuation.suspend();
> >> }
"echo " + x is causing the creation of StringBuilder object:
new StringBuilder("echo ").append(x);
As an ugly workaround, method may be rewritten as this:
private void echo(int x) {
System.out.println(join("echo ", x));
Continuation.suspend();
}
private String join(String prefix, int o) { return prefix + o; }
Btw, is Eugen still participate in Javaflow project? Need fix for this bug
too, but JVM bytecode is a Greek for me...
Jin Mingjian wrote:
>
> get the older archive? why not use the asm version?
>
> regards,
> Jin
>
>
>
> 2009/9/1 Hiroshi Yamauchi <[email protected]>
>
>> Hi Torsten,
>>
>> How do I use BCEL from javaflow, or how do I get the BCEL based javaflow?
>>
>> Thanks,
>>
>> Hiroshi
>>
>> On Sun, Aug 23, 2009 at 10:10 AM, Torsten Curdt<[email protected]> wrote:
>> > In the latest trunk javaflow switched to use the ASM engine instead of
>> > the BCEL one by default. There is still some work to do. But maybe
>> > give the BCEL one a try.
>> >
>> > cheers
>> > --
>> > Torsten
>> >
>> > On Tue, Aug 18, 2009 at 02:15, Hiroshi Yamauchi<[email protected]>
>> wrote:
>> >> Hi,
>> >>
>> >> I'm trying to run a javaflow example code. But it's been unsuccessful
>> so
>> far.
>> >>
>> >> I'm basically following this blog post:
>> >> http://blogs.sun.com/sundararajan/entry/continuations_for_java
>> >>
>> >> I built javaflow-1.0-SNAPSHOT.jar using maven and downloaded
>> >> commons-logging-1.1.1.jar and asm-all-3.2.jar.
>> >>
>> >> Here's what I did:
>> >>
>> >> $ cat Test.java
>> >> import org.apache.commons.javaflow.*;
>> >>
>> >> class Test {
>> >> static class MyRunnable implements Runnable {
>> >> public void run() {
>> >> System.out.println("run started!");
>> >> for( int i=0; i < 10; i++ ) {
>> >> echo(i);
>> >> }
>> >> }
>> >>
>> >> private void echo(int x) {
>> >> System.out.println("echo " + x);
>> >> Continuation.suspend();
>> >> }
>> >> }
>> >>
>> >> public static void main(String[] args) {
>> >> System.out.println("main started");
>> >> Continuation c = Continuation.startWith(new MyRunnable());
>> >> System.out.println("in main after continuation return");
>> >> while (c != null) {
>> >> c = Continuation.continueWith(c);
>> >> System.out.println("in main");
>> >> }
>> >> }
>> >> }
>> >> $ javac -cp ../target/javaflow-1.0-SNAPSHOT.jar Test.java
>> >> $ jar cvf Test.jar Test.class Test\$MyRunnable.class
>> >> added manifest
>> >> adding: Test.class(in = 882) (out= 516)(deflated 41%)
>> >> adding: Test$MyRunnable.class(in = 903) (out= 563)(deflated 37%)
>> >> $ java -cp
>> ../target/javaflow-1.0-SNAPSHOT.jar:../lib/commons-logging-1.1.1.jar:../lib/asm-all-3.2.jar
>> >> org.apache.commons.javaflow.utils.RewritingUtils Test.jar
>> >> Test-instrumented.jar
>> >> rewriting Test.jar
>> >> org.objectweb.asm.tree.analysis.AnalyzerException: Error at
>> >> instruction 8: Cannot pop operand off an empty stack.
>> >> 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.rewriteJar(RewritingUtils.java:108)
>> >> at
>> org.apache.commons.javaflow.utils.RewritingUtils.rewriteJar(RewritingUtils.java:71)
>> >> at
>> org.apache.commons.javaflow.utils.RewritingUtils.main(RewritingUtils.java:181)
>> >> 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)
>> >> at
>> org.apache.commons.javaflow.bytecode.transformation.asm.MonitoringFrame.execute(MonitoringFrame.java:70)
>> >> ... 10 more
>> >> org.objectweb.asm.tree.analysis.AnalyzerException: Error at
>> >> instruction 8: Cannot pop operand off an empty stack.
>> >> at org.objectweb.asm.tree.analysis.Analyzer.analyze(Unknown
>> Source)
>> >> at org.objectweb.asm.util.CheckMethodAdapter$1.visitEnd(Unknown
>> Source)
>> >> at org.objectweb.asm.util.CheckMethodAdapter.visitEnd(Unknown
>> Source)
>> >> at org.objectweb.asm.tree.MethodNode.accept(Unknown Source)
>> >> at
>> org.apache.commons.javaflow.bytecode.transformation.asm.ContinuationMethodAnalyzer.visitEnd(ContinuationMethodAnalyzer.java:141)
>> >> at org.objectweb.asm.ClassReader.accept(Unknown Source)
>> >> at org.objectweb.asm.ClassReader.accept(Unknown Source)
>> >> at
>> org.apache.commons.javaflow.bytecode.transformation.asm.AsmClassTransformer.transform(AsmClassTransformer.java:53)
>> >> at
>> org.apache.commons.javaflow.bytecode.transformation.asm.AsmClassTransformer.transform(AsmClassTransformer.java:40)
>> >> at
>> org.apache.commons.javaflow.utils.RewritingUtils.rewriteJar(RewritingUtils.java:108)
>> >> at
>> org.apache.commons.javaflow.utils.RewritingUtils.rewriteJar(RewritingUtils.java:71)
>> >> at
>> org.apache.commons.javaflow.utils.RewritingUtils.main(RewritingUtils.java:181)
>> >> Caused by: java.lang.IndexOutOfBoundsException: Cannot pop operand off
>> >> an empty stack.
>> >> at org.objectweb.asm.tree.analysis.Frame.pop(Unknown Source)
>> >> at org.objectweb.asm.tree.analysis.Frame.execute(Unknown Source)
>> >> ... 12 more
>> >> Exception in thread "main" java.lang.RuntimeException: Error at
>> >> instruction 8: Cannot pop operand off an empty stack.
>> >> main([Ljava/lang/String;)V
>> >> 00000 R . : : L0
>> >> 00001 R . : : LINENUMBER 19 L0
>> >> 00002 R . : : GETSTATIC java/lang/System.out :
>> Ljava/io/PrintStream;
>> >> 00003 R . : R : LDC "main started"
>> >> 00004 R . : R R : L1
>> >> 00005 R . : R R : INVOKEVIRTUAL java/io/PrintStream.println
>> >> (Ljava/lang/String;)V
>> >> 00006 R . : : L2
>> >> 00007 R . : : LINENUMBER 20 L2
>> >> 00008 R . : : INVOKESPECIAL Test$MyRunnable.<init> ()V
>> >> 00009 ? : NEW Test$MyRunnable
>> >> 00010 ? : DUP
>> >> 00011 ? : L3
>> >> 00012 ? : INVOKESTATIC
>> >> org/apache/commons/javaflow/Continuation.startWith
>> >> (Ljava/lang/Runnable;)Lorg/apache/commons/javaflow/Continuation;
>> >> 00013 ? : ASTORE 1
>> >> 00014 ? : L4
>> >> 00015 ? : LINENUMBER 21 L4
>> >> 00016 ? : GETSTATIC java/lang/System.out :
>> Ljava/io/PrintStream;
>> >> 00017 ? : LDC "in main after continuation return"
>> >> 00018 ? : L5
>> >> 00019 ? : INVOKEVIRTUAL java/io/PrintStream.println
>> >> (Ljava/lang/String;)V
>> >> 00020 ? : L6
>> >> 00021 ? : LINENUMBER 22 L6
>> >> 00022 ? : FRAME APPEND
>> [org/apache/commons/javaflow/Continuation]
>> >> 00023 ? : ALOAD 1
>> >> 00024 ? : IFNULL L7
>> >> 00025 ? : L8
>> >> 00026 ? : LINENUMBER 23 L8
>> >> 00027 ? : ALOAD 1
>> >> 00028 ? : L9
>> >> 00029 ? : INVOKESTATIC
>> >> org/apache/commons/javaflow/Continuation.continueWith
>> >>
>> (Lorg/apache/commons/javaflow/Continuation;)Lorg/apache/commons/javaflow/Continuation;
>> >> 00030 ? : ASTORE 1
>> >> 00031 ? : L10
>> >> 00032 ? : LINENUMBER 24 L10
>> >> 00033 ? : GETSTATIC java/lang/System.out :
>> Ljava/io/PrintStream;
>> >> 00034 ? : LDC "in main"
>> >> 00035 ? : L11
>> >> 00036 ? : INVOKEVIRTUAL java/io/PrintStream.println
>> >> (Ljava/lang/String;)V
>> >> 00037 ? : GOTO L6
>> >> 00038 ? : L7
>> >> 00039 ? : LINENUMBER 26 L7
>> >> 00040 ? : FRAME SAME
>> >> 00041 ? : RETURN
>> >>
>> >>
>> >> 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.rewriteJar(RewritingUtils.java:108)
>> >> at
>> org.apache.commons.javaflow.utils.RewritingUtils.rewriteJar(RewritingUtils.java:71)
>> >> at
>> org.apache.commons.javaflow.utils.RewritingUtils.main(RewritingUtils.java:181)
>> >>
>> >> Can someone advise how to get this working?
>> >>
>> >> Thanks,
>> >> Hiroshi
>> >>
>> >> ---------------------------------------------------------------------
>> >> To unsubscribe, e-mail: [email protected]
>> >> For additional commands, e-mail: [email protected]
>> >>
>> >>
>> >
>> > ---------------------------------------------------------------------
>> > To unsubscribe, e-mail: [email protected]
>> > For additional commands, e-mail: [email protected]
>> >
>> >
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: [email protected]
>> For additional commands, e-mail: [email protected]
>>
>>
>
>
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