[jboss-jira] [JBoss JIRA] (JASSIST-207) Inconsistent Stack Map when inserting throw Expression with Java 7

[Shigeru Chiba (JIRA)]

    [ https://issues.jboss.org/browse/JASSIST-207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12796136#comment-12796136 ] 

Shigeru Chiba commented on JASSIST-207:
---------------------------------------

This problem was due to several bugs related to dead code.
I investigated the entire code of the stack map generator
and (hopefully) fixed them.
                
> Inconsistent Stack Map when inserting throw Expression with Java 7
> ------------------------------------------------------------------
>
>                 Key: JASSIST-207
>                 URL: https://issues.jboss.org/browse/JASSIST-207
>             Project: Javassist
>          Issue Type: Bug
>    Affects Versions: 3.18.0-GA
>            Reporter: Ben Romberg
>            Assignee: Shigeru Chiba
>            Priority: Critical
>         Attachments: afterInsertThrowExpression.txt, beforeInsertThrowExpression.txt, conditionalThrowExceptionInserted.txt
>
>
> I wrote a unit-test for javassist, reproducing the issue:
> {code}
> public class ThrowExpressionCorruptsStackMapTableTest extends JvstTestRoot {
> 	public ThrowExpressionCorruptsStackMapTableTest(String name) {
> 		super(name);
> 	}
> 	public void testInsertLocalVars() throws Exception {
> 		CtClass cc = sloader.get("test4.LocalVars");
> 		CtMethod m1 = cc.getDeclaredMethod("run");
> 		m1.insertBefore("throw new AssertionError((Object) \"assertion error\");");
> 		cc.writeFile();
> 		Object obj = make(cc.getName());
> 		assertEquals(10, invoke(obj, "run"));
> 	}
> }
> {code}
> Throws:
> java.lang.VerifyError: Expecting a stack map frame in method test4.LocalVars.run()I at offset 45
> My use-case is almost the same, inserting a "throw AssertionError(...)" expression with insertBefore. However, I get a slightly different error message:
> Stack map does not match the one at exception handler 37 in method timeofday.TimeOfDay.getSecond()I at offset 27

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