[jboss-jira] [JBoss JIRA] Commented: (JASSIST-80) Editing MethodCall produces incorrect byte code | java.lang.VerifyError: Illegal target of jump or branch | invalid instruction

Editing MethodCall produces incorrect byte code | java.lang.VerifyError: Illegal target of jump or branch | invalid instruction ------------------------------------------------------------------------------------------------------------------------------- Key: JASSIST-80 URL: https://jira.jboss.org/jira/browse/JASSIST-80 Project: Javassist Issue Type: Bug Affects Versions: 3.10.0.GA Environment: $ java -version java version "1.6.0_07" Java(TM) SE Runtime Environment (build 1.6.0_07-b06-153) Java HotSpot(TM) 64-Bit Server VM (build 1.6.0_07-b06-57, mixed mode) Reporter: Martin Burger Assignee: Shigeru Chiba Attachments: TokenStream.java, TokenStream_instrumented.class, TokenStream_instrumented.dump, TokenStream_original.class Note: Most likely this issue is related to JASSIST-79. I instrument method calls in a class called org.mozilla.javascript.TokenStream. If I run (or, load) this class, a java.lang.VerifyError will be thrown: Exception in thread "main" java.lang.VerifyError: (class: org/mozilla/javascript/TokenStream, method: getToken$JINSI_4etOXffNDXVw signature: ()I) Illegal target of jump or branch It seems Javassist introduces a defective goto statement at position 33217 in method getToken$JINSI_4etOXffNDXVw: 33217 goto 465 The corresponding Java code (excerpt): case '-': if (matchChar('=')) { this.op = SUB; c = ASSIGN; } else if (matchChar('-')) { if (0 == (flags & TSF_DIRTYLINE)) { // treat HTML end-comment after possible whitespace // after line start as comment-utill-eol if (matchChar('>')) { skipLine(); continue retry; } } c = DEC; } else { c = SUB; } flags |= TSF_DIRTYLINE; return c; I think the continue statement is related to this defect. JAD fails to decompile the instrumented class: ERROR: invalid instruction at 33217 in the method getToken$JINSI_4etOXffNDXVw. The method will be decompiled incorrectly. Javassist's framedump fails, too: Exception in thread "main" java.lang.RuntimeException: javassist.bytecode.BadBytecode: Stack is empty[pos = 465] at javassist.bytecode.analysis.FramePrinter.print(FramePrinter.java:89) at javassist.bytecode.analysis.FramePrinter.print(FramePrinter.java:60) at javassist.bytecode.analysis.FramePrinter.print(FramePrinter.java:51) at javassist.tools.framedump.main(framedump.java:45) Caused by: javassist.bytecode.BadBytecode: Stack is empty[pos = 465] at javassist.bytecode.analysis.Analyzer.analyzeNextEntry(Analyzer.java:179) at javassist.bytecode.analysis.Analyzer.analyze(Analyzer.java:143) at javassist.bytecode.analysis.FramePrinter.print(FramePrinter.java:87) ... 3 more Caused by: java.lang.IndexOutOfBoundsException: Stack is empty at javassist.bytecode.analysis.Frame.pop(Frame.java:130) at javassist.bytecode.analysis.Executor.simplePop(Executor.java:970) at javassist.bytecode.analysis.Executor.evalStore(Executor.java:869) at javassist.bytecode.analysis.Executor.execute(Executor.java:188) at javassist.bytecode.analysis.Analyzer.analyzeNextEntry(Analyzer.java:177) ... 5 more