使用ASM进行Java字节码操作
[英]Java Byte code Manipulation with ASM
问题描述
I'm using ASM 3.3.1. 
我正在使用ASM 3.3.1。 I am trying to intercept a class and change one of it's methods. 我试图拦截一个类并更改其方法之一。 I am using the org.objectweb.asm.util.ASMifierClassVisitor to get ASM code to make the new method. 我正在使用org.objectweb.asm.util.ASMifierClassVisitor来获取ASM代码以制作新方法。 Everything works great but I can't asmify if() statements. 一切都很好，但我无法将if（）语句进行氨化。 When I try to use the resulting asm code with an if statement (or loops) in it, I get a “stack size too large” error at runtime. 当我尝试在其中使用带有if语句（或循环）的结果asm代码时，在运行时出现“堆栈大小太大”错误。 I am using ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_FRAMES);. 我正在使用ClassWriter writer = new ClassWriter（ClassWriter.COMPUTE_FRAMES）;。 This is the ASMIFY code it gives me. 这是它给我的ASMIFY代码。
Do you have any idea why I would only get an error when i'm ASMIFYING if() statements? 你有什么主意，为什么我只会在if（）语句中出现错误？ I would greatly greatly appreciate any help. 我将不胜感激任何帮助。
`mv = cw.visitMethod(ACC_PUBLIC, "doWrite", "(Lorg/apache/tomcat/util/buf/ByteChunk;)V", null, new String[] { "java/io/IOException" });
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, "org/apache/coyote/Response", "req", "Lorg/apache/coyote/Request;");
mv.visitMethodInsn(INVOKEVIRTUAL, "org/apache/coyote/Request", "getParameters", "()Lorg/apache/tomcat/util/http/Parameters;");
mv.visitMethodInsn(INVOKEVIRTUAL, "org/apache/tomcat/util/http/Parameters", "paramsAsString", "()Ljava/lang/String;");
mv.visitVarInsn(ASTORE, 2);
mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
mv.visitInsn(DUP);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "()V");
mv.visitLdcInsn("The Parameters are: ");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;");
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V");
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, "org/apache/coyote/Response", "req", "Lorg/apache/coyote/Request;");
mv.visitMethodInsn(INVOKEVIRTUAL, "org/apache/coyote/Request", "getParameters", "()Lorg/apache/tomcat/util/http/Parameters;");
mv.visitLdcInsn("json");
mv.visitMethodInsn(INVOKEVIRTUAL, "org/apache/tomcat/util/http/Parameters", "getParameter", "(Ljava/lang/String;)Ljava/lang/String;");
mv.visitVarInsn(ASTORE, 3);
mv.visitVarInsn(ALOAD, 3);
Label l0 = new Label();
mv.visitJumpInsn(IFNULL, l0);
mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
mv.visitLdcInsn("###%#%#%$%#%#%#%#%#%#%#%##%#");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V");
mv.visitLabel(l0);
mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
mv.visitInsn(DUP);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "()V");
mv.visitLdcInsn("Headers: ");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;");
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, "org/apache/coyote/Response", "headers", "Lorg/apache/tomcat/util/http/MimeHeaders;");
mv.visitMethodInsn(INVOKEVIRTUAL, "org/apache/tomcat/util/http/MimeHeaders", "toString", "()Ljava/lang/String;");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;");
mv.visitLdcInsn("\n");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V");
mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
mv.visitInsn(DUP);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "()V");
mv.visitLdcInsn("Writeing: ");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;");
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, "org/apache/tomcat/util/buf/ByteChunk", "toString", "()Ljava/lang/String;");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;");
mv.visitLdcInsn("\n");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V");
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, "org/apache/coyote/Response", "outputBuffer", "Lorg/apache/coyote/OutputBuffer;");
mv.visitVarInsn(ALOAD, 1);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKEINTERFACE, "org/apache/coyote/OutputBuffer", "doWrite", "(Lorg/apache/tomcat/util/buf/ByteChunk;Lorg/apache/coyote/Response;)I");
mv.visitInsn(POP);
mv.visitVarInsn(ALOAD, 0);
mv.visitInsn(DUP);
mv.visitFieldInsn(GETFIELD, "org/apache/coyote/Response", "bytesWritten", "J");
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, "org/apache/tomcat/util/buf/ByteChunk", "getLength", "()I");
mv.visitInsn(I2L);
mv.visitInsn(LADD);
mv.visitFieldInsn(PUTFIELD, "org/apache/coyote/Response", "bytesWritten", "J");
mv.visitInsn(RETURN);
mv.visitMaxs(5, 4);
mv.visitEnd();
`
The Code I am ASMifying. 我正在批准的代码。 (Note: I've taken out the method as that's all I'm using) （注意：我已经删除了该方法，因为这就是我正在使用的所有方法）
public void doWrite(ByteChunk chunk/*byte buffer[], int pos, int count*/)
throws IOException
{
String params=req.getParameters().paramsAsString();
System.out.println("The Parameters are: "+params);
String reqParam = req.getParameters().getParameter("json");
if(reqParam != null)
{
System.out.println("###%#%#%$%#%#%#%#%#%#%#%##%#");
}
System.out.println("Headers: " + headers.toString()+ "\n");
System.out.println("Writeing: " +chunk.toString()+"\n");
outputBuffer.doWrite(chunk, this);
bytesWritten+=chunk.getLength();
}
The original method just contains the last two lines 原始方法仅包含最后两行
outputBuffer.doWrite(chunk, this);
bytesWritten+=chunk.getLength();
This Doesn't look good. 这看起来不太好。 I used the CheckClassAdapter.verify() method and got this for the part of class I'm messing with. 我使用了CheckClassAdapter.verify（）方法，并将其作为我所迷惑的类的一部分。
doWrite(Lorg/apache/tomcat/util/buf/ByteChunk;)V
00000 Response ByteChunk . . : : FRAME FULL [] []
00001 Response ByteChunk . . : : ALOAD 0
00002 Response ByteChunk . . : Response : GETFIELD org/apache/coyote/Response.req : Lorg/apache/coyote/Request;
00003 Response ByteChunk . . : Request : INVOKEVIRTUAL org/apache/coyote/Request.getParameters ()Lorg/apache/tomcat/util/http/Parameters;
00004 Response ByteChunk . . : Parameters : INVOKEVIRTUAL org/apache/tomcat/util/http/Parameters.paramsAsString ()Ljava/lang/String;
00005 Response ByteChunk . . : String : ASTORE 2
00006 Response ByteChunk String . : : GETSTATIC java/lang/System.out : Ljava/io/PrintStream;
00007 Response ByteChunk String . : PrintStream : NEW java/lang/StringBuilder
00008 Response ByteChunk String . : PrintStream StringBuilder : DUP
00009 Response ByteChunk String . : PrintStream StringBuilder StringBuilder : INVOKESPECIAL java/lang/StringBuilder.<init> ()V
00010 Response ByteChunk String . : PrintStream StringBuilder : LDC "The Parameters are: "
00011 Response ByteChunk String . : PrintStream StringBuilder String : INVOKEVIRTUAL java/lang/StringBuilder.append (Ljava/lang/String;)Ljava/lang/StringBuilder;
00012 Response ByteChunk String . : PrintStream StringBuilder : ALOAD 2
00013 Response ByteChunk String . : PrintStream StringBuilder String : INVOKEVIRTUAL java/lang/StringBuilder.append (Ljava/lang/String;)Ljava/lang/StringBuilder;
00014 Response ByteChunk String . : PrintStream StringBuilder : INVOKEVIRTUAL java/lang/StringBuilder.toString ()Ljava/lang/String;
00015 Response ByteChunk String . : PrintStream String : INVOKEVIRTUAL java/io/PrintStream.println (Ljava/lang/String;)V
00016 Response ByteChunk String . : : ALOAD 0
00017 Response ByteChunk String . : Response : GETFIELD org/apache/coyote/Response.req : Lorg/apache/coyote/Request;
00018 Response ByteChunk String . : Request : INVOKEVIRTUAL org/apache/coyote/Request.getParameters ()Lorg/apache/tomcat/util/http/Parameters;
00019 Response ByteChunk String . : Parameters : LDC "json"
00020 Response ByteChunk String . : Parameters String : INVOKEVIRTUAL org/apache/tomcat/util/http/Parameters.getParameter (Ljava/lang/String;)Ljava/lang/String;
00021 Response ByteChunk String . : String : ASTORE 3
00022 Response ByteChunk String String : : ALOAD 3
00023 Response ByteChunk String String : String : IFNULL L0
00024 Response ByteChunk String String : : GETSTATIC java/lang/System.out : Ljava/io/PrintStream;
00025 Response ByteChunk String String : PrintStream : LDC "###%#%#%$%#%#%#%#%#%#%#%##%#"
00026 Response ByteChunk String String : PrintStream String : INVOKEVIRTUAL java/io/PrintStream.println (Ljava/lang/String;)V
00027 Response ByteChunk String String : : L0
00028 Response ByteChunk String String : : FRAME FULL [org/apache/coyote/Response org/apache/tomcat/
00029 Response ByteChunk String String : : GETSTATIC java/lang/System.out : Ljava/io/PrintStream;
00030 Response ByteChunk String String : PrintStream : NEW java/lang/StringBuilder
00031 Response ByteChunk String String : PrintStream StringBuilder : DUP
00032 Response ByteChunk String String : PrintStream StringBuilder StringBuilder : INVOKESPECIAL java/lang/StringBuilder.<init> ()V
00033 Response ByteChunk String String : PrintStream StringBuilder : LDC "Headers: "
00034 Response ByteChunk String String : PrintStream StringBuilder String : INVOKEVIRTUAL java/lang/StringBuilder.append (Ljava/lang/String;)Ljava/lang/StringBuilder;
00035 Response ByteChunk String String : PrintStream StringBuilder : ALOAD 0
00036 Response ByteChunk String String : PrintStream StringBuilder Response : GETFIELD org/apache/coyote/Response.headers : Lorg/apache/tomcat/util/http/MimeHeaders;
00037 Response ByteChunk String String : PrintStream StringBuilder MimeHeaders : INVOKEVIRTUAL org/apache/tomcat/util/http/MimeHeaders.toString ()Ljava/lang/String;
00038 Response ByteChunk String String : PrintStream StringBuilder String : INVOKEVIRTUAL java/lang/StringBuilder.append (Ljava/lang/String;)Ljava/lang/StringBuilder;
00039 Response ByteChunk String String : PrintStream StringBuilder : LDC "\n"
00040 Response ByteChunk String String : PrintStream StringBuilder String : INVOKEVIRTUAL java/lang/StringBuilder.append (Ljava/lang/String;)Ljava/lang/StringBuilder;
00041 Response ByteChunk String String : PrintStream StringBuilder : INVOKEVIRTUAL java/lang/StringBuilder.toString ()Ljava/lang/String;
00042 Response ByteChunk String String : PrintStream String : INVOKEVIRTUAL java/io/PrintStream.println (Ljava/lang/String;)V
00043 Response ByteChunk String String : : GETSTATIC java/lang/System.out : Ljava/io/PrintStream;
00044 Response ByteChunk String String : PrintStream : NEW java/lang/StringBuilder
00045 Response ByteChunk String String : PrintStream StringBuilder : DUP
00046 Response ByteChunk String String : PrintStream StringBuilder StringBuilder : INVOKESPECIAL java/lang/StringBuilder.<init> ()V
00047 Response ByteChunk String String : PrintStream StringBuilder : LDC "Writeing: "
00048 Response ByteChunk String String : PrintStream StringBuilder String : INVOKEVIRTUAL java/lang/StringBuilder.append (Ljava/lang/String;)Ljava/lang/StringBuilder;
00049 Response ByteChunk String String : PrintStream StringBuilder : ALOAD 1
00050 Response ByteChunk String String : PrintStream StringBuilder ByteChunk : INVOKEVIRTUAL org/apache/tomcat/util/buf/ByteChunk.toString ()Ljava/lang/String;
00051 Response ByteChunk String String : PrintStream StringBuilder String : INVOKEVIRTUAL java/lang/StringBuilder.append (Ljava/lang/String;)Ljava/lang/StringBuilder;
00052 Response ByteChunk String String : PrintStream StringBuilder : LDC "\n"
00053 Response ByteChunk String String : PrintStream StringBuilder String : INVOKEVIRTUAL java/lang/StringBuilder.append (Ljava/lang/String;)Ljava/lang/StringBuilder;
00054 Response ByteChunk String String : PrintStream StringBuilder : INVOKEVIRTUAL java/lang/StringBuilder.toString ()Ljava/lang/String;
00055 Response ByteChunk String String : PrintStream String : INVOKEVIRTUAL java/io/PrintStream.println (Ljava/lang/String;)V
00056 Response ByteChunk String String : : ALOAD 0
00057 Response ByteChunk String String : Response : GETFIELD org/apache/coyote/Response.outputBuffer : Lorg/apache/coyote/OutputBuffer;
00058 Response ByteChunk String String : OutputBuffer : ALOAD 1
00059 Response ByteChunk String String : OutputBuffer ByteChunk : ALOAD 0
00060 Response ByteChunk String String : OutputBuffer ByteChunk Response : INVOKEINTERFACE org/apache/coyote/OutputBuffer.doWrite (Lorg/apache/tomcat/util/buf/ByteChunk;Lorg/apache/coyote/Response;)I
00061 Response ByteChunk String String : I : POP
00062 Response ByteChunk String String : : ALOAD 0
00063 Response ByteChunk String String : Response : DUP
00064 Response ByteChunk String String : Response Response : GETFIELD org/apache/coyote/Response.bytesWritten : J
00065 Response ByteChunk String String : Response J : ALOAD 1
00066 Response ByteChunk String String : Response J ByteChunk : INVOKEVIRTUAL org/apache/tomcat/util/buf/ByteChunk.getLength ()I
00067 Response ByteChunk String String : Response J I : I2L
00068 Response ByteChunk String String : Response J J : LADD
00069 Response ByteChunk String String : Response J : PUTFIELD org/apache/coyote/Response.bytesWritten : J
00070 Response ByteChunk String String : : RETURN
00071 ? : NOP
00072 ? : NOP
00073 ? : NOP
00074 ? : NOP
00075 ? : NOP
00076 ? : NOP
00077 ? : NOP
00078 ? : NOP
00079 ? : NOP
00080 ? : NOP
00081 ? : NOP
00082 ? : NOP
00083 ? : NOP
00084 ? : NOP
00085 ? : NOP
00086 ? : NOP
00087 ? : NOP
00088 ? : NOP
00089 ? : NOP
00090 ? : NOP
00091 ? : NOP
00092 ? : NOP
00093 ? : NOP
00094 ? : NOP
00095 ? : NOP
00096 ? : NOP
00097 ? : ATHROW
1 个解决方案
解决方案1
0 2011-10-07 17:59:21
I doubt the problem is you can't use ASMIfier on a class which contains an if statement. 我怀疑问题是您不能在包含if语句的类上使用ASMIfier。
It is far more likely that when you added to code generated by the ASMifier, you have used the stack in a way which increased the amount of stack needed and you didn't increase the maximum set at the end of the method. 当您添加到由ASMifier生成的代码时，使用堆栈的可能性更大，这增加了所需的堆栈数量，而没有增加方法结尾处的最大设置。
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