class文件与dex文件比较

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新建smali.java

public class smali{    public int foo(int a,int b){        return (a+b)*(a-b);    }    public static void main(String[] argc){        smali s=new smali();        System.out.println(s.foo(3,5));    }}

编译.java文件,生成：javac smali.java
编译.class文件,生成dex文件：dx --dex --output=smali.dex smali.class //dx工具在sdk目录下（android-sdk\build-tools\26.0.2）

反编译阶段
反编译.class文件：javap -c smali.class
输出结果：

Compiled from "smali.java"public class smali {  public smali();    Code:       0: aload_0       1: invokespecial #1                  // Method java/lang/Object."<init>":()V       4: return  public int foo(int, int);    Code:       0: iload_1       1: iload_2       2: iadd       3: iload_1       4: iload_2       5: isub       6: imul       7: ireturn  public static void main(java.lang.String[]);    Code:       0: new           #2                  // class smali       3: dup       4: invokespecial #3                  // Method "<init>":()V       7: astore_1       8: getstatic     #4                  // Field java/lang/System.out:Ljava/io/PrintStream;      11: aload_1      12: iconst_3      13: iconst_5      14: invokevirtual #5                  // Method foo:(II)I      17: invokevirtual #6                  // Method java/io/PrintStream.println:(I)V      20: return}

反编译.dex文件：dexdump -d smali.dex（dexdump命令也在sdk目录）
输出信息：

Processing 'smali.dex'...Opened 'smali.dex', DEX version '035'Class #0            -  Class descriptor  : 'Lsmali;'  Access flags      : 0x0001 (PUBLIC)  Superclass        : 'Ljava/lang/Object;'  Interfaces        -  Static fields     -  Instance fields   -  Direct methods    -    #0              : (in Lsmali;)      name          : '<init>'      type          : '()V'      access        : 0x10001 (PUBLIC CONSTRUCTOR)      code          -      registers     : 1      ins           : 1      outs          : 1      insns size    : 4 16-bit code units00014c:                                        |[00014c] smali.<init>:()V00015c: 7010 0100 0000                         |0000: invoke-direct {v0}, Ljava/lang/Object;.<init>:()V // method@0001000162: 0e00                                   |0003: return-void      catches       : (none)      positions     :        0x0000 line=1      locals        :        0x0000 - 0x0004 reg=0 this Lsmali;    #1              : (in Lsmali;)      name          : 'main'      type          : '([Ljava/lang/String;)V'      access        : 0x0009 (PUBLIC STATIC)      code          -      registers     : 5      ins           : 1      outs          : 3      insns size    : 17 16-bit code units000164:                                        |[000164] smali.main:([Ljava/lang/String;)V000174: 2200 0400                              |0000: new-instance v0, Lsmali; // type@0004000178: 7010 0200 0000                         |0002: invoke-direct {v0}, Lsmali;.<init>:()V // method@000200017e: 6201 0000                              |0005: sget-object v1, Ljava/lang/System;.out:Ljava/io/PrintStream; // field@0000000182: 1232                                   |0007: const/4 v2, #int 3 // #3000184: 1253                                   |0008: const/4 v3, #int 5 // #5000186: 6e30 0300 2003                         |0009: invoke-virtual {v0, v2, v3}, Lsmali;.foo:(II)I // method@000300018c: 0a00                                   |000c: move-result v000018e: 6e20 0000 0100                         |000d: invoke-virtual {v1, v0}, Ljava/io/PrintStream;.println:(I)V // method@0000000194: 0e00                                   |0010: return-void      catches       : (none)      positions     :        0x0000 line=7        0x0005 line=8        0x0010 line=9      locals        :  Virtual methods   -    #0              : (in Lsmali;)      name          : 'foo'      type          : '(II)I'      access        : 0x0001 (PUBLIC)      code          -      registers     : 5      ins           : 3      outs          : 0      insns size    : 6 16-bit code units000198:                                        |[000198] smali.foo:(II)I0001a8: 9000 0304                              |0000: add-int v0, v3, v40001ac: 9101 0304                              |0002: sub-int v1, v3, v40001b0: b210                                   |0004: mul-int/2addr v0, v10001b2: 0f00                                   |0005: return v0      catches       : (none)      positions     :        0x0000 line=3      locals        :        0x0000 - 0x0006 reg=2 this Lsmali;  source_file_idx   : 15 (smali.java)

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