Jasmin Assembler VerifyError:期望在堆栈上找到对象/数组

时间:2011-07-15 14:37:32

标签: java jvm bytecode assembly jasmin

我在“java testphase”之后得到了这个错误:

C:\jasmin-2.4>java testphase
Exception in thread "main" java.lang.VerifyError: 
  (class: testphase, method: main signature: ([Ljava/lang/String;)V) 
  Expecting to find object/array on stack
  Could not find the main class: testphase. 
Program will exit.

代码:

.class public testphase
.super java/lang/Object

; standard initializer
.method public <init>()V
  aload_0
  invokenonvirtual java/lang/Object/<init>()V
  return
.end method

.method public static main([Ljava/lang/String;)V
  .limit stack 10
  .limit locals 3

  ; assign something
  iconst_1
  iconst_1
  iadd
  istore_1

 ; assign something
  iconst_2
  iconst_2
  isub
  istore_2

 ; Writeln
  getstatic java/lang/System/out Ljava/io/PrintStream;
  iload_1
  invokevirtual java/io/PrintStream/println(Ljava/lang/String;)V

  return
.end method

2 个答案:

答案 0 :(得分:1)

你有多个问题。

首先:你需要改变最后的

iload_1

aload_1

  • 您正在加载String数组参数,因此不应使用整数加载(iload)来执行此操作。

其次,您正在加载String数组,而不是String。您需要选择所需的元素。 (查看aaload,了解如何取消引用数组中的元素。)

你需要在实际工作之前解决这两个问题。

答案 1 :(得分:0)

这将有效:

.class public testphase
.super java/lang/Object

; standard initializer
  .method public <init>()V
   aload_0
   invokenonvirtual java/lang/Object/<init>()V
   return
.end method

.method public static main([Ljava/lang/String;)V
  .limit stack 2
  .limit locals 3

  ; assign something
  iconst_1
  iconst_1
  iadd
  istore_1

  ; assign something
  iconst_2
  iconst_2
  isub
  istore_2

  ; Writeln
  getstatic java/lang/System/out Ljava/io/PrintStream;
  iload_1
  invokevirtual java/io/PrintStream/println(I)V

  ; Writeln variable 2
  getstatic java/lang/System/out Ljava/io/PrintStream;
  iload_2
  invokevirtual java/io/PrintStream/println(I)V

  return
.end method

基本上,更改包含System.out.println(int)的签名。