Question

编译java文件时，在IntelliJ项目中出现此错误。没有列出特定的源文件，但它因此错误而失败。

删除以下编译器标志可修复错误：

-source 1.5 -target 1.5

然而，由于我们的目标是Java 5，因此需要将它们放在那里。是否存在导致此错误的特定代码（可能是try/catch块）？

2013-10-15 16:21:50,556 [26947209]   INFO - ompiler.BackendCompilerWrapper - JSR/RET are not supported with computeFrames option 
java.lang.RuntimeException: JSR/RET are not supported with computeFrames option
    at org.objectweb.asm.Frame.a(Unknown Source)
    at org.objectweb.asm.MethodWriter.visitJumpInsn(Unknown Source)
    at org.objectweb.asm.MethodAdapter.visitJumpInsn(Unknown Source)
    at org.objectweb.asm.ClassReader.accept(Unknown Source)
    at org.objectweb.asm.ClassReader.accept(Unknown Source)
    at com.intellij.compiler.impl.javaCompiler.BackendCompilerWrapper$ClassParsingThread.a(BackendCompilerWrapper.java:893)
    at com.intellij.compiler.impl.javaCompiler.BackendCompilerWrapper$ClassParsingThread.run(BackendCompilerWrapper.java:846)
    at com.intellij.openapi.application.impl.ApplicationImpl$7.run(ApplicationImpl.java:386)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:680)
    at com.intellij.openapi.application.impl.ApplicationImpl$1$1.run(ApplicationImpl.java:130)

Answer 1

当try / finally块出现在源代码中时，

JSR / RET指令出现在字节代码中。即使使用-target 1.5，Javac 1.6+似乎也不会发出它们，但Eclipse java编译器会这样做。

实施例

public class JSRDemo {
    public static void main(String[] args) {
        try {
            bodyOfTry();
        }
        finally {
            bodyOfFinally();
        }
    }

...

字节代码

  // access flags 0x9
  public static main([Ljava/lang/String;)V
    TRYCATCHBLOCK L0 L1 L1 null
    TRYCATCHBLOCK L2 L3 L1 null
   L0
    LINENUMBER 4 L0
    INVOKESTATIC JSRDemo.bodyOfTry ()V
   L4
    LINENUMBER 5 L4
    GOTO L2
   L1
    LINENUMBER 6 L1
    ASTORE 2
    JSR L5               // JSR jumps to the finally block
   L6
    LINENUMBER 8 L6
    ALOAD 2
    ATHROW
   L5
    LINENUMBER 6 L5
    ASTORE 1
   L7
    LINENUMBER 7 L7
    INVOKESTATIC JSRDemo.bodyOfFinally ()V
   L8
    LINENUMBER 8 L8
    RET 1                 // RET returns from the finally block
   L2
    JSR L5                // Jump to the same finally block from another execution path
   L3
    LINENUMBER 9 L3
    RETURN
   L9
    LOCALVARIABLE args [Ljava/lang/String; L0 L9 0
    MAXSTACK = 1
    MAXLOCALS = 3

编译错误：computeFrames选项不支持JSR / RET

1 个答案: