(3)Smali系列学习之Smali语法详解

数据类型

Dalvik字节码只有两种格式：基本类型和引用类型。对象和数组属于引用类型

语法含义
V void，只用于返回值类型
Z boolean
B byte
S short
C char
I int
J long
F flot
D double
L Java类 类型
[ 数组类型

Ljava/lang/String; 相当于java.lang.String 
[I 相当于一维int数组，int[] 
[[I 相当于int[][]

方法

它使用方法名，参数类型和返回值来描述一个方法 
package/name/ObjectName;->methodName(III)Z

package/name/ObjectName:一个类 
methodName：方法名 
III：参数类型 
Z：返回值

(III)Z：方法签名

BakSmali生成的方法代码以.method指令开始，以.end method指令结束，根据方法的类型不同，可以会在方法前加#表示方法类型

# vitual methods:虚方法，如：

 1 # virtual methods
 2 .method public get(Ljava/lang/String;)Lcn/woblog/markdowndiary/domain/Note;
 3     .locals 2
 4     .param p1, "noteId"    # Ljava/lang/String;
 5 
 6     .prologue
 7     .line 50
 8     iget-object v0, p0, Lcn/woblog/markdowndiary/repository/LocalNoteRepository;->orm:Lcom/litesuits/orm/LiteOrm;
 9 
10     const-class v1, Lcn/woblog/markdowndiary/domain/Note;
11 
12     invoke-virtual {v0, p1, v1}, Lcom/litesuits/orm/LiteOrm;->queryById(Ljava/lang/String;Ljava/lang/Class;)Ljava/lang/Object;
13 
14     move-result-object v0
15 
16     check-cast v0, Lcn/woblog/markdowndiary/domain/Note;
17 
18     return-object v0
19 .end method

# direct methods:直接方法，如：

 1 # direct methods
 2 .method public constructor <init>(Landroid/content/Context;)V
 3     .locals 2
 4     .param p1, "context"    # Landroid/content/Context;
 5 
 6     .prologue
 7     .line 22
 8     invoke-direct {p0}, Ljava/lang/Object;-><init>()V
 9 
10     .line 23
11     iput-object p1, p0, Lcn/woblog/markdowndiary/repository/LocalNoteRepository;->context:Landroid/content/Context;
12 
13     .line 24
14     const-string v0, "note.db"
15 
16     invoke-static {p1, v0}, Lcom/litesuits/orm/LiteOrm;->newSingleInstance(Landroid/content/Context;Ljava/lang/String;)Lcom/litesuits/orm/LiteOrm;
17 
18     move-result-object v0
19 
20     iput-object v0, p0, Lcn/woblog/markdowndiary/repository/LocalNoteRepository;->orm:Lcom/litesuits/orm/LiteOrm;
21 
22     .line 25
23     iget-object v0, p0, Lcn/woblog/markdowndiary/repository/LocalNoteRepository;->orm:Lcom/litesuits/orm/LiteOrm;
24 
25     const/4 v1, 0x1
26 
27     invoke-virtual {v0, v1}, Lcom/litesuits/orm/LiteOrm;->setDebugged(Z)V
28 
29     .line 26
30     return-void
31 .end method

有些方法没有这样的注释

 1 .method public save(Lcn/woblog/markdowndiary/domain/Note;)V
 2     .locals 1
 3     .param p1, "note"    # Lcn/woblog/markdowndiary/domain/Note;
 4 
 5     .prologue
 6     .line 37
 7     iget-object v0, p0, Lcn/woblog/markdowndiary/repository/LocalNoteRepository;->orm:Lcom/litesuits/orm/LiteOrm;
 8 
 9     invoke-virtual {v0, p1}, Lcom/litesuits/orm/LiteOrm;->save(Ljava/lang/Object;)J
10 
11     .line 38
12     return-void
13 .end method

静态方法：

 1 .method public static formatTime(J)Ljava/lang/String;
 2     .locals 4
 3     .param p0, "date"    # J
 4 
 5     .prologue
 6     .line 11
 7     new-instance v0, Ljava/text/SimpleDateFormat;
 8 
 9     const-string v1, "yyyyu5e74MMu6708ddu65e5 EEEE"
10 
11     sget-object v2, Ljava/util/Locale;->CHINESE:Ljava/util/Locale;
12 
13     invoke-direct {v0, v1, v2}, Ljava/text/SimpleDateFormat;-><init>(Ljava/lang/String;Ljava/util/Locale;)V
14 
15     .line 13
16     .local v0, "simpleDateFormat":Ljava/text/SimpleDateFormat;
17     invoke-static {p0, p1}, Ljava/lang/Long;->valueOf(J)Ljava/lang/Long;
18 
19     move-result-object v1
20 
21     invoke-virtual {v0, v1}, Ljava/text/SimpleDateFormat;->format(Ljava/lang/Object;)Ljava/lang/String;
22 
23     move-result-object v1
24 
25     return-object v1
26 .end method

字段

与方法表示很相似，只是字段没有方法签名和返回值，取而代之的是字段类型 
Lpackage/name/ObjectName;->FiedlName:Ljava/lang/String;

其中字段名与字段类型用冒号“:”分割

1 # static fields
2 .field private static instance:Lcn/woblog/markdowndiary/repository/LocalNoteRepository;
3 
4 
5 # instance fields
6 .field private final context:Landroid/content/Context;

其中： 
# static fields：静态字段 
# instance fields：实例字段

Dalvik指令集

他在调用格式上模仿了C语言的调用约定，官方地址,指令语法与助词有如下特点：

  1. 采用采用从目标(destination)到源(source)的方法
  2. 根据字节码的大小与类型不同，一些字节码添加了名称后缀已消除歧义 
    2.1 32位常规类型的字节码未添加任何后缀 
    2.2 64位常规类型的字节码添加 -wide后缀 
    3.3 特殊类型的字节码根据具体类型添加后缀，-boolean,-byte,-char,-short,-int,-long,-float,-double,-object,-string,-class,-void之一
  3. 根据字节码的布局和选项不同，一些字节码添加了字节后缀消除歧义，后缀与字节码直接用/分割
  4. 在指令集的描述中，宽度值中每个字母表示宽度为4位

如： 
move-wide/from16 vAA, vBBBB 
move-wide/from16 v18, v0

move:基础字节码(base opcode)，标示是基本操作 
wide:标示指令操作的数据宽度为64位宽度 
from16:字节码后缀(opcode suffix),标示源(vBBBB)为一个16的寄存器引用变量 
vAA:目的寄存器，v0~v255 
vBBBB:源寄存器，v0~v65535

指令

nop

空操作，被用来做对齐代码

数据定义

用来定义程序中用到的常量，字符串，类等数据 
const/4 vA, #+B :将数组扩展为32位后赋给寄存器vA 
const/16 vAA, #+BBBB 
const vAA, #+BBBBBBBB：将数组赋值给寄存器vAA 
const-wide/16 vAA, #+BBBBB ：将数值扩展为64位后赋给寄存器vAA 
const-string vAA, string@BBBB：将字符串索引构造一个字符串并赋给vAA 
const-class vAA, type@BBBB:通过类型索引获取一个类的引用并赋给寄存器vAA

 1 private void testConst() {
 2     int a = 1;
 3     int b = 7;
 4     int c = 254;
 5     int d = 2345;
 6     int d1 = 65538;
 7 
 8     long e = 12435465657677L;
 9     float f = 123235409234.09097945F;
10     double g = 111343333454999999999.912384375;
11 }
 1 //-8到7用4，大于255小于等于65535用16
 2 const/4 v0, 0x1
 3 
 4 .line 25
 5 .local v0, "a":I
 6 const/4 v1, 0x7
 7 
 8 .line 26
 9 .local v1, "b":I
10 const/16 v2, 0xfe
11 
12 .line 27
13 .local v2, "c":I
14 const/16 v3, 0x929
15 
16 .line 28
17 .local v3, "d":I
18 const v4, 0x10002 //65538，大于65535用const v4
19 
20 //long用const-wide
21 .line 30
22 .local v4, "d1":I
23 const-wide v6, 0xb4f5b835d4dL
24 
25 .line 31
26 .local v6, "e":J
27 const v5, 0x51e58b39
28 
29 .line 32
30 .local v5, "f":F
31 const-wide v8, 0x441824cbef6b9491L    # 1.11343333455E20

数据操作指令

move destination, source 
根据字节码大小和类型不同，后面回天津不同的后缀 
move vA, vB：vB寄存器值赋值给vA寄存器，都为4位 
move-object vA,vB 
move-result vAA：将上一个invoke类型的指令操作的单字非对象结果负责vAA寄存器 
move-result-object vAA：将上一个invoke类型指令操作的对象赋值给vAA 
move-exception vAA:保存一个运行时发生的异常vAA寄存器，必须是异常发生时的异常处理的第一条指令

 1 private void testMove() {
 2     int a = 100;
 3     long b = 100000000000000000L;
 4 
 5     int c = a;
 6     long d = b;
 7 
 8     Log.d(TAG,c+"");
 9     Log.d(TAG,d+"");
10 
11 
12     int e = getIntResult();
13     Log.d(TAG,e+"");
14 
15     try {
16         int f = e/c;
17     } catch (ArithmeticException e1) {
18         e1.printStackTrace();
19     }catch (Exception e1) {
20         e1.printStackTrace();
21     }finally {
22 
23     }
24 }
 1 //move-result-object
 2 invoke-direct {v7}, Ljava/lang/StringBuilder;-><init>()V
 3 
 4 invoke-virtual {v7, v1}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;
 5 
 6 move-result-object v7
 7 
 8 const-string v8, ""
 9 
10 invoke-virtual {v7, v8}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;
11 
12 move-result-object v7
13 
14 //move-result
15 invoke-direct {p0}, Lcom/woblog/testsmali/MainActivity;->getIntResult()I
16 
17 move-result v6
18 
19 //move exception
20 .line 35
21 :try_start_0
22 div-int v8, v6, v1
23 :try_end_0
24 .catch Ljava/lang/ArithmeticException; {:try_start_0 .. :try_end_0} :catch_0
25 .catch Ljava/lang/Exception; {:try_start_0 .. :try_end_0} :catch_1
26 .catchall {:try_start_0 .. :try_end_0} :catchall_0
27 
28 .line 43
29 :goto_0
30 return-void
31 
32 .line 36
33 :catch_0
34 move-exception v7
35 
36 .line 37
37 .local v7, "e1":Ljava/lang/ArithmeticException;
38 :try_start_1
39 invoke-virtual {v7}, Ljava/lang/ArithmeticException;->printStackTrace()V
40 :try_end_1
41 .catchall {:try_start_1 .. :try_end_1} :catchall_0
42 
43 goto :goto_0
44 
45 .line 40
46 .end local v7    # "e1":Ljava/lang/ArithmeticException;
47 :catchall_0
48 move-exception v8
49 
50 throw v8
51 
52 .line 38
53 :catch_1
54 move-exception v7
55 
56 .line 39
57 .local v7, "e1":Ljava/lang/Exception;
58 :try_start_2
59 invoke-virtual {v7}, Ljava/lang/Exception;->printStackTrace()V
60 :try_end_2
61 .catchall {:try_start_2 .. :try_end_2} :catchall_0
62 
63 goto :goto_0

返回指令

return-void :返回一个void 
return vAA:返回一个32位非对象类型的值，返回寄存器为8位 
return-wide vAA：返回一个64位非对象类型的值，返回寄存器为8位 
return-object vAA:返回一个对象类型

 1 private String returnObject() {
 2     return new String("");
 3 }
 4 
 5 private float returnFloat() {
 6     return 12333334.00234345F;
 7 }
 8 
 9 private double returnDouble() {
10     return 3425465767.9345865;
11 }
12 
13 private long returnLong() {
14     return 12445657999999L;
15 }
16 
17 private int returnInt() {
18     return 1024;
19 }
20 
21 private void returnVoid() {
22     int a = 3;
23 }
 1 .method private returnDouble()D
 2     .locals 2
 3 
 4     .prologue
 5     .line 40
 6     const-wide v0, 0x41e9858eb4fde822L    # 3.4254657679345865E9
 7 
 8     return-wide v0
 9 .end method
10 
11 .method private returnFloat()F
12     .locals 1
13 
14     .prologue
15     .line 36
16     const v0, 0x4b3c3116    # 1.2333334E7f
17 
18     return v0
19 .end method
20 
21 .method private returnInt()I
22     .locals 1
23 
24     .prologue
25     .line 48
26     const/16 v0, 0x400
27 
28     return v0
29 .end method
30 
31 .method private returnLong()J
32     .locals 2
33 
34     .prologue
35     .line 44
36     const-wide v0, 0xb51bb062a7fL
37 
38     return-wide v0
39 .end method
40 
41 .method private returnObject()Ljava/lang/String;
42     .locals 2
43 
44     .prologue
45     .line 32
46     new-instance v0, Ljava/lang/String;
47 
48     const-string v1, ""
49 
50     invoke-direct {v0, v1}, Ljava/lang/String;-><init>(Ljava/lang/String;)V
51 
52     return-object v0
53 .end method
54 
55 .method private returnVoid()V
56     .locals 1
57 
58     .prologue
59     .line 52
60     const/4 v0, 0x3
61 
62     .line 53
63     .local v0, "a":I
64     return-void
65 .end method

锁指令

锁指令多用在多线程程序中对同一对象的操作 
monitor-enter vAA 为指定的对象获取锁 
monitor-exit vAA 释放指定的对象的锁

 1 private void callSynchronizeClassMethod() {
 2     synchronized (MainActivity.class) {
 3         Log.d("TAG","synchronized class");
 4     }
 5 }
 6 
 7 private void callSynchronizeMethod() {
 8     synchronized (this) {
 9         Log.d("TAG","synchronized this");
10     }
11 }
12 
13 private synchronized void callLockMethod() {
14     Log.d("TAG","synchronized method");
15 }
 1 .method private declared-synchronized callLockMethod()V
 2     .locals 2
 3 
 4     .prologue
 5     .line 43
 6     monitor-enter p0
 7 
 8     :try_start_0
 9     const-string v0, "TAG"
10 
11     const-string v1, "synchronized method"
12 
13     invoke-static {v0, v1}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
14     :try_end_0
15     .catchall {:try_start_0 .. :try_end_0} :catchall_0
16 
17     .line 44
18     monitor-exit p0
19 
20     return-void
21 
22     .line 43
23     :catchall_0
24     move-exception v0
25 
26     monitor-exit p0
27 
28     throw v0
29 .end method
30 
31 .method private callSynchronizeClassMethod()V
32     .locals 3
33 
34     .prologue
35     .line 31
36     const-class v1, Lcom/woblog/testsmali/MainActivity;
37 
38     monitor-enter v1
39 
40     .line 32
41     :try_start_0
42     const-string v0, "TAG"
43 
44     const-string v2, "synchronized class"
45 
46     invoke-static {v0, v2}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
47 
48     .line 33
49     monitor-exit v1
50 
51     .line 34
52     return-void
53 
54     .line 33
55     :catchall_0
56     move-exception v0
57 
58     monitor-exit v1
59     :try_end_0
60     .catchall {:try_start_0 .. :try_end_0} :catchall_0
61 
62     throw v0
63 .end method
64 
65 .method private callSynchronizeMethod()V
66     .locals 2
67 
68     .prologue
69     .line 37
70     monitor-enter p0
71 
72     .line 38
73     :try_start_0
74     const-string v0, "TAG"
75 
76     const-string v1, "synchronized this"
77 
78     invoke-static {v0, v1}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
79 
80     .line 39
81     monitor-exit p0
82 
83     .line 40
84     return-void
85 
86     .line 39
87     :catchall_0
88     move-exception v0
89 
90     monitor-exit p0
91     :try_end_0
92     .catchall {:try_start_0 .. :try_end_0} :catchall_0
93 
94     throw v0
95 .end method

实例操作

包括类型转换，检查和创建新实例 
check-cast vAA, type@BBBB：将vAA中的对象转为指定类型，如果失败会抛出ClassCastException异常，如果类型B是基本类型，对于分基本类型的A来说运行始终是失败的 
instance-of vA, vB, type@CCCC:判断vB寄存器的对象是否可以转为指定类型，如果可以vA为1，否则为0 
new-instance vAA, type@BBBB:构造一个指定类型的对象，并赋值给vAA寄存器，不能是数组类型

 1 CharSequence cs = new String();
 2 Object o = cs;
 3 
 4 String s = (String) cs;
 5 
 6 //实例检测
 7 if (s instanceof CharSequence) {
 8     Log.d("TAG", "ok");
 9 } else {
10     Log.d("TAG","no");
11 }
12 
13 
14 //创建实例
15 StringBuilder sb = new StringBuilder();
16 sb.append("Ok");
17 
18 String s1 = new String("new string");
19 String s2 = "string";
 1 new-instance v1, Ljava/lang/String;
 2 
 3 invoke-direct {v1}, Ljava/lang/String;-><init>()V
 4 
 5 .line 33
 6 .local v1, "cs":Ljava/lang/CharSequence;
 7 move-object v7, v1
 8 
 9 .local v7, "o":Ljava/lang/CharSequence;
10 move-object v8, v1
11 
12 .line 35
13 check-cast v8, Ljava/lang/String;
14 
15 .line 38
16 .local v8, "s":Ljava/lang/String;
17 instance-of v12, v8, Ljava/lang/CharSequence;
18 
19 if-eqz v12, :cond_0
20 
21 .line 39
22 const-string v12, "TAG"
23 
24 const-string v13, "ok"
25 
26 invoke-static {v12, v13}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
27 
28 .line 46
29 :goto_0
30 new-instance v11, Ljava/lang/StringBuilder;
31 
32 invoke-direct {v11}, Ljava/lang/StringBuilder;-><init>()V
33 
34 .line 47
35 .local v11, "sb":Ljava/lang/StringBuilder;
36 const-string v12, "Ok"
37 
38 invoke-virtual {v11, v12}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;
39 
40 .line 49
41 new-instance v9, Ljava/lang/String;
42 
43 const-string v12, "new string"
44 
45 invoke-direct {v9, v12}, Ljava/lang/String;-><init>(Ljava/lang/String;)V
46 
47 .line 50
48 .local v9, "s1":Ljava/lang/String;
49 const-string v10, "string"
50 
51 .line 51
52 .local v10, "s2":Ljava/lang/String;
53 return-void
54 
55 .line 41
56 .end local v9    # "s1":Ljava/lang/String;
57 .end local v10    # "s2":Ljava/lang/String;
58 .end local v11    # "sb":Ljava/lang/StringBuilder;
59 :cond_0
60 const-string v12, "TAG"
61 
62 const-string v13, "no"
63 
64 invoke-static {v12, v13}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
65 
66 goto :goto_0

数组操作

包括获取数组长度，新建数组，数组赋值，数组元素取值与赋值等 
array-length vA, vB:获取vB寄存器中数组的长度并赋值给vA寄存器 
new-array vA, vB, type@CCCC：构造指定类型(type@CCCC)与大小(vB)的数组，并赋值给vA寄存器 
filled-new-array {vC,vD,vE,vF,vG}, type@BBBB:构造指定类型(type@BBBB)与大小vA的数组并填充数组内容，除了指定数组的大小还指定了参数个数 
filled-new-array/range {vCCCC .. vNNNN}, type@BBBB:与上一条类似，只是参数使用取值范围，vC是第一个参数寄存器，N=A+C-1 
fill-array-data vAA, +BBBBBBBB:vAA为寄存器数组引用，后面跟一个数据表 
arrayop vAA, vBB, vCC：对vBB寄存器指定的数组元素进入取值或赋值。vCC指定数组元素索引，vAA寄存器用来存放读取的或需要设置的值。读取元素使用age类指令，赋值使用aput类指令，根据数组中存储的类指令后面会跟不同的后缀： 
aget,aget-wide,aget-object,aget-boolean,aget-byte,aget-char,aget-short 
aput,aput-wide,aput-object,aput-boolean,aput-byte,aput-char,aput-short

 1 private void testArray() {
 2     int[] ints = new int[2];
 3     int[] ints1 = null;
 4     int[] ints2 = {1,2,3};
 5 
 6     Integer[] integers = new Integer[]{1,2,4};
 7 
 8     int[] strings = {1,2,3,4,5,6,5,6,6,6,6,6,6,7,7,8,8,8,8,8,1,1,1,3,3,5,6,54,5,6,56,567,67,6,34,45,45,6,56,57,45,45,5,56,56,7,34,543,543,6,56,56,45,4,54,5,45,56};
 9 
10     //数组长度
11     int length = ints.length;
12     int length1 = ints2.length;
13     int length2 = strings.length;
14 
15     //获取数组元素
16     int string = strings[30];
17     int string1 = ints2[1];
18 
19     //赋值
20     strings[30] =  length;
21     ints2[1] =  length2;
22 }
  1 .method private testArray()V
  2     .locals 15
  3 
  4     .prologue
  5     const/16 v14, 0x1e
  6 
  7     const/4 v10, 0x3
  8 
  9     const/4 v13, 0x2
 10 
 11     const/4 v12, 0x1
 12 
 13     .line 27
 14     new-array v1, v13, [I
 15 
 16     .line 28
 17     .local v1, "ints":[I
 18     const/4 v2, 0x0
 19 
 20     .line 29
 21     .local v2, "ints1":[I
 22     new-array v3, v10, [I
 23 
 24     fill-array-data v3, :array_0
 25 
 26     .line 31
 27     .local v3, "ints2":[I
 28     new-array v0, v10, [Ljava/lang/Integer;
 29 
 30     const/4 v10, 0x0
 31 
 32     invoke-static {v12}, Ljava/lang/Integer;->valueOf(I)Ljava/lang/Integer;
 33 
 34     move-result-object v11
 35 
 36     aput-object v11, v0, v10
 37 
 38     invoke-static {v13}, Ljava/lang/Integer;->valueOf(I)Ljava/lang/Integer;
 39 
 40     move-result-object v10
 41 
 42     aput-object v10, v0, v12
 43 
 44     const/4 v10, 0x4
 45 
 46     invoke-static {v10}, Ljava/lang/Integer;->valueOf(I)Ljava/lang/Integer;
 47 
 48     move-result-object v10
 49 
 50     aput-object v10, v0, v13
 51 
 52     .line 33
 53     .local v0, "integers":[Ljava/lang/Integer;
 54     const/16 v10, 0x3a
 55 
 56     new-array v9, v10, [I
 57 
 58     fill-array-data v9, :array_1
 59 
 60     .line 36
 61     .local v9, "strings":[I
 62     array-length v4, v1
 63 
 64     .line 37
 65     .local v4, "length":I
 66     array-length v5, v3
 67 
 68     .line 38
 69     .local v5, "length1":I
 70     array-length v6, v9
 71 
 72     .line 41
 73     .local v6, "length2":I
 74     aget v7, v9, v14
 75 
 76     .line 42
 77     .local v7, "string":I
 78     aget v8, v3, v12
 79 
 80     .line 45
 81     .local v8, "string1":I
 82     aput v4, v9, v14
 83 
 84     .line 46
 85     aput v6, v3, v12
 86 
 87     .line 47
 88     return-void
 89 
 90     .line 29
 91     :array_0
 92     .array-data 4
 93         0x1
 94         0x2
 95         0x3
 96     .end array-data
 97 
 98     .line 33
 99     :array_1
100     .array-data 4
101         0x1
102         0x2
103         0x3
104         0x4
105         0x5
106         0x6
107         0x5
108         0x6
109         0x6
110         0x6
111         0x6
112         0x6
113         0x6
114         0x7
115         0x7
116         0x8
117         0x8
118         0x8
119         0x8
120         0x8
121         0x1
122         0x1
123         0x1
124         0x3
125         0x3
126         0x5
127         0x6
128         0x36
129         0x5
130         0x6
131         0x38
132         0x237
133         0x43
134         0x6
135         0x22
136         0x2d
137         0x2d
138         0x6
139         0x38
140         0x39
141         0x2d
142         0x2d
143         0x5
144         0x38
145         0x38
146         0x7
147         0x22
148         0x21f
149         0x21f
150         0x6
151         0x38
152         0x38
153         0x2d
154         0x4
155         0x36
156         0x5
157         0x2d
158         0x38
159     .end array-data
160 .end method

异常指令

throw vAA:抛出vAA寄存器中指定类型的异常

 1 private void throw2() {
 2     try {
 3         throw new Exception("test throw runtime exception");
 4     } catch (Exception e) {
 5         e.printStackTrace();
 6     }
 7 }
 8 
 9 private void throw1() {
10     throw new RuntimeException("test throw runtime exception");
11 }
 1 .method private throw1()V
 2     .locals 2
 3 
 4     .prologue
 5     .line 38
 6     new-instance v0, Ljava/lang/RuntimeException;
 7 
 8     const-string v1, "test throw runtime exception"
 9 
10     invoke-direct {v0, v1}, Ljava/lang/RuntimeException;-><init>(Ljava/lang/String;)V
11 
12     throw v0
13 .end method
14 
15 .method private throw2()V
16     .locals 3
17 
18     .prologue
19     .line 31
20     :try_start_0
21     new-instance v1, Ljava/lang/Exception;
22 
23     const-string v2, "test throw runtime exception"
24 
25     invoke-direct {v1, v2}, Ljava/lang/Exception;-><init>(Ljava/lang/String;)V
26 
27     throw v1
28     :try_end_0
29     .catch Ljava/lang/Exception; {:try_start_0 .. :try_end_0} :catch_0
30 
31     .line 32
32     :catch_0
33     move-exception v0
34 
35     .line 33
36     .local v0, "e":Ljava/lang/Exception;
37     invoke-virtual {v0}, Ljava/lang/Exception;->printStackTrace()V
38 
39     .line 35
40     return-void
41 .end method

跳转指令

用于从当前地址跳转到指定的偏移处，提供了三种指令：无条件(goto),分支跳转(switch),条件跳转(if) 
goto +AA:无条件跳转到指定偏移处，AA不能为0 
goto/16 +AAAA 
goto/32 +AAAAAAAA

packed-switch vAA, +BBBBBBBB:分支跳转，vAA寄存器为switch分支需要判断的值

if-test vA, vB, +CCCC 条件跳转指令，比较vA寄存器与vB寄存器的值，如果比较结果满足就跳转到CCCC指定的偏移处，不能为0，有以下几条：

if-eq:if(vA==vB) 
if-ne:vA!=vB 
if-lt:vA

 1 private void testIfz() {
 2     int a = 3;
 3     if (a == 0) {
 4 
 5     } else {
 6 
 7     }
 8     if (a != 0) {
 9 
10     } else {
11 
12     }
13     if (a < 0) {
14 
15     } else {
16 
17     }
18     if (a > 0) {
19 
20     } else {
21 
22     }
23     if (a <= 0) {
24 
25     } else {
26 
27     }
28     if (a >= 0) {
29 
30     } else {
31 
32     }
33 
34     if (a < 5) {
35         Log.d("TAG", "<5");
36     } else if (a > 5) {
37         Log.d("TAG", ">5");
38     } else {
39         Log.d("TAG", "=5");
40     }
41 }
42 
43 private void testIf() {
44     int a = 2;
45     int b = 3;
46     if (a == b) {
47 
48     } else {
49 
50     }
51     if (a != b) {
52 
53     } else {
54 
55     }
56     if (a < b) {
57 
58     } else {
59 
60     }
61     if (a > b) {
62 
63     } else {
64 
65     }
66     if (a <= b) {
67 
68     } else {
69 
70     }
71     if (a >= b) {
72 
73     } else {
74 
75     }
76 
77 }
  1 .method private testIf()V
  2     .locals 2
  3 
  4     .prologue
  5     .line 69
  6     const/4 v0, 0x2
  7 
  8     .line 70
  9     .local v0, "a":I
 10     const/4 v1, 0x3
 11 
 12     .line 71
 13     .local v1, "b":I
 14     if-ne v0, v1, :cond_0
 15 
 16     .line 76
 17     :cond_0
 18     if-eq v0, v1, :cond_1
 19 
 20     .line 81
 21     :cond_1
 22     if-ge v0, v1, :cond_2
 23 
 24     .line 86
 25     :cond_2
 26     if-le v0, v1, :cond_3
 27 
 28     .line 91
 29     :cond_3
 30     if-gt v0, v1, :cond_4
 31 
 32     .line 96
 33     :cond_4
 34     if-lt v0, v1, :cond_5
 35 
 36     .line 102
 37     :cond_5
 38     return-void
 39 .end method
 40 
 41 .method private testIfz()V
 42     .locals 3
 43 
 44     .prologue
 45     const/4 v1, 0x5
 46 
 47     .line 27
 48     const/4 v0, 0x3
 49 
 50     .line 28
 51     .local v0, "a":I
 52     if-nez v0, :cond_0
 53 
 54     .line 33
 55     :cond_0
 56     if-eqz v0, :cond_1
 57 
 58     .line 38
 59     :cond_1
 60     if-gez v0, :cond_2
 61 
 62     .line 43
 63     :cond_2
 64     if-lez v0, :cond_3
 65 
 66     .line 48
 67     :cond_3
 68     if-gtz v0, :cond_4
 69 
 70     .line 53
 71     :cond_4
 72     if-ltz v0, :cond_5
 73 
 74     .line 59
 75     :cond_5
 76     if-ge v0, v1, :cond_6
 77 
 78     .line 60
 79     const-string v1, "TAG"
 80 
 81     const-string v2, "<5"
 82 
 83     invoke-static {v1, v2}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
 84 
 85     .line 66
 86     :goto_0
 87     return-void
 88 
 89     .line 61
 90     :cond_6
 91     if-le v0, v1, :cond_7
 92 
 93     .line 62
 94     const-string v1, "TAG"
 95 
 96     const-string v2, ">5"
 97 
 98     invoke-static {v1, v2}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
 99 
100     goto :goto_0
101 
102     .line 64
103     :cond_7
104     const-string v1, "TAG"
105 
106     const-string v2, "=5"
107 
108     invoke-static {v1, v2}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
109 
110     goto :goto_0
111 .end method

比较指令

用于对两个寄存器的值比较 
cmpkind vAA, vBB, vCC：vBB和vCC为要比较的值，结果放到vAA中 
cmpl-float:单精度，vBB大于vCC，vAA=-1,等于vAA=0,小于vAA=1 
cmpg-float：单精度，vBB大于vCC，vAA=1,等于vAA=0,小于vAA=-1 
cmpl-double:双精度 
cmpg-double:双精度 
cmp-long:长整形

 1 private void testCmpLong() {
 2     long a = 13;
 3     long b = 12;
 4     if (a < b) {
 5         Log.d("TAG", "<");
 6     } else if (a > b) {
 7         Log.d("TAG", ">");
 8     } else {
 9         Log.d("TAG", "=");
10     }
11 }
12 
13 private void testCmpDouble() {
14     double a = 13.4;
15     double b = 11.4;
16     if (a < b) {
17         Log.d("TAG", "<");
18     } else if (a > b) {
19         Log.d("TAG", ">");
20     } else {
21         Log.d("TAG", "=");
22     }
23 }
24 
25 private void testCmpFloat() {
26     float a = 13.4F;
27     float b = 10.4F;
28     if (a < b) {
29         Log.d("TAG", "<");
30     } else if (a > b) {
31         Log.d("TAG", ">");
32     } else {
33         Log.d("TAG", "=");
34     }
35 }
  1 .method private testCmpDouble()V
  2     .locals 6
  3 
  4     .prologue
  5     .line 46
  6     const-wide v0, 0x402acccccccccccdL    # 13.4
  7 
  8     .line 47
  9     .local v0, "a":D
 10     const-wide v2, 0x4026cccccccccccdL    # 11.4
 11 
 12     .line 48
 13     .local v2, "b":D
 14     cmpg-double v4, v0, v2
 15 
 16     if-gez v4, :cond_0
 17 
 18     .line 49
 19     const-string v4, "TAG"
 20 
 21     const-string v5, "<"
 22 
 23     invoke-static {v4, v5}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
 24 
 25     .line 55
 26     :goto_0
 27     return-void
 28 
 29     .line 50
 30     :cond_0
 31     cmpl-double v4, v0, v2
 32 
 33     if-lez v4, :cond_1
 34 
 35     .line 51
 36     const-string v4, "TAG"
 37 
 38     const-string v5, ">"
 39 
 40     invoke-static {v4, v5}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
 41 
 42     goto :goto_0
 43 
 44     .line 53
 45     :cond_1
 46     const-string v4, "TAG"
 47 
 48     const-string v5, "="
 49 
 50     invoke-static {v4, v5}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
 51 
 52     goto :goto_0
 53 .end method
 54 
 55 .method private testCmpFloat()V
 56     .locals 4
 57 
 58     .prologue
 59     .line 58
 60     const v0, 0x41566666    # 13.4f
 61 
 62     .line 59
 63     .local v0, "a":F
 64     const v1, 0x41266666    # 10.4f
 65 
 66     .line 60
 67     .local v1, "b":F
 68     cmpg-float v2, v0, v1
 69 
 70     if-gez v2, :cond_0 #>=
 71 
 72     .line 61
 73     const-string v2, "TAG"
 74 
 75     const-string v3, "<"
 76 
 77     invoke-static {v2, v3}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
 78 
 79     .line 67
 80     :goto_0
 81     return-void
 82 
 83     .line 62
 84     :cond_0
 85     cmpl-float v2, v0, v1
 86 
 87     if-lez v2, :cond_1 #<=
 88 
 89     .line 63
 90     const-string v2, "TAG"
 91 
 92     const-string v3, ">"
 93 
 94     invoke-static {v2, v3}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
 95 
 96     goto :goto_0
 97 
 98     .line 65
 99     :cond_1
100     const-string v2, "TAG"
101 
102     const-string v3, "="
103 
104     invoke-static {v2, v3}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
105 
106     goto :goto_0
107 .end method
108 
109 .method private testCmpLong()V
110     .locals 6
111 
112     .prologue
113     .line 34
114     const-wide/16 v0, 0xd
115 
116     .line 35
117     .local v0, "a":J
118     const-wide/16 v2, 0xc
119 
120     .line 36
121     .local v2, "b":J
122     cmp-long v4, v0, v2
123 
124     if-gez v4, :cond_0
125 
126     .line 37
127     const-string v4, "TAG"
128 
129     const-string v5, "<"
130 
131     invoke-static {v4, v5}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
132 
133     .line 43
134     :goto_0
135     return-void
136 
137     .line 38
138     :cond_0
139     cmp-long v4, v0, v2
140 
141     if-lez v4, :cond_1
142 
143     .line 39
144     const-string v4, "TAG"
145 
146     const-string v5, ">"
147 
148     invoke-static {v4, v5}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
149 
150     goto :goto_0
151 
152     .line 41
153     :cond_1
154     const-string v4, "TAG"
155 
156     const-string v5, "="
157 
158     invoke-static {v4, v5}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
159 
160     goto :goto_0
161 .end method

字段操作指令

用来对 对象实例的字段进行读写操作。字段类型可以是Java中有效的类型，对于实例字段和静态字段有两类指令： 
iget,iput对实例字段进行读，写 
sget,sput对静态字段

会根据类型不同添加不同的后缀 
iget，iget-wide,iget-object,iget-boolean,iget-byte,iget-char,iget-short 
iput,iput-wide,iput-object,iput-boolean,iput-byte,iput-char,iput-short

sget,sget-wide,sget-object,sget-boolean,sget-byte,sget-char,sget-short 

 1 private void testInstanceFieldOperator() {
 2     //write
 3     InstanceObject instanceObject = new InstanceObject();
 4     instanceObject.aInt=1;
 5     instanceObject.aLong=12454L;
 6     instanceObject.aFloat=12344.45F;
 7     instanceObject.aDouble=123546.2;
 8     instanceObject.object=new Object();
 9     instanceObject.aBoolean=true;
10     instanceObject.aByte=3;
11     instanceObject.aChar='c';
12     instanceObject.aShort=1;
13 
14     Log.d("TAG",String.valueOf(instanceObject.aInt));
15     Log.d("TAG",String.valueOf(instanceObject.aLong));
16     Log.d("TAG",String.valueOf(instanceObject.aFloat));
17     Log.d("TAG",String.valueOf(instanceObject.aDouble));
18     Log.d("TAG",String.valueOf(instanceObject.object));
19     Log.d("TAG",String.valueOf(instanceObject.aBoolean));
20     Log.d("TAG",String.valueOf(instanceObject.aByte));
21     Log.d("TAG",String.valueOf(instanceObject.aChar));
22     Log.d("TAG",String.valueOf(instanceObject.aShort));
23 }
24 
25 private void testStatusFieldOperator() {
26     //write
27     StatusObject.aInt=1;
28     StatusObject.aLong=12454L;
29     StatusObject.aFloat=12344.45F;
30     StatusObject.aDouble=123546.2;
31     StatusObject.object=new Object();
32     StatusObject.aBoolean=true;
33     StatusObject.aByte=3;
34     StatusObject.aChar='c';
35     StatusObject.aShort=1;
36 
37     Log.d("TAG",String.valueOf(StatusObject.aInt));
38     Log.d("TAG",String.valueOf(StatusObject.aLong));
39     Log.d("TAG",String.valueOf(StatusObject.aFloat));
40     Log.d("TAG",String.valueOf(StatusObject.aDouble));
41     Log.d("TAG",String.valueOf(StatusObject.object));
42     Log.d("TAG",String.valueOf(StatusObject.aBoolean));
43     Log.d("TAG",String.valueOf(StatusObject.aByte));
44     Log.d("TAG",String.valueOf(StatusObject.aChar));
45     Log.d("TAG",String.valueOf(StatusObject.aShort));
46 }
  1 .method private testInstanceFieldOperator()V
  2     .locals 5
  3 
  4     .prologue
  5     const/4 v4, 0x1
  6 
  7     .line 30
  8     new-instance v0, Lcom/woblog/testsmali/InstanceObject;
  9 
 10     invoke-direct {v0}, Lcom/woblog/testsmali/InstanceObject;-><init>()V
 11 
 12     .line 31
 13     .local v0, "instanceObject":Lcom/woblog/testsmali/InstanceObject;
 14     iput v4, v0, Lcom/woblog/testsmali/InstanceObject;->aInt:I
 15 
 16     .line 32
 17     const-wide/16 v2, 0x30a6
 18 
 19     iput-wide v2, v0, Lcom/woblog/testsmali/InstanceObject;->aLong:J
 20 
 21     .line 33
 22     const v1, 0x4640e1cd
 23 
 24     iput v1, v0, Lcom/woblog/testsmali/InstanceObject;->aFloat:F
 25 
 26     .line 34
 27     const-wide v2, 0x40fe29a333333333L    # 123546.2
 28 
 29     iput-wide v2, v0, Lcom/woblog/testsmali/InstanceObject;->aDouble:D
 30 
 31     .line 35
 32     new-instance v1, Ljava/lang/Object;
 33 
 34     invoke-direct {v1}, Ljava/lang/Object;-><init>()V
 35 
 36     iput-object v1, v0, Lcom/woblog/testsmali/InstanceObject;->object:Ljava/lang/Object;
 37 
 38     .line 36
 39     iput-boolean v4, v0, Lcom/woblog/testsmali/InstanceObject;->aBoolean:Z
 40 
 41     .line 37
 42     const/4 v1, 0x3
 43 
 44     iput-byte v1, v0, Lcom/woblog/testsmali/InstanceObject;->aByte:B
 45 
 46     .line 38
 47     const/16 v1, 0x63
 48 
 49     iput-char v1, v0, Lcom/woblog/testsmali/InstanceObject;->aChar:C
 50 
 51     .line 39
 52     iput-short v4, v0, Lcom/woblog/testsmali/InstanceObject;->aShort:S
 53 
 54     .line 41
 55     const-string v1, "TAG"
 56 
 57     iget v2, v0, Lcom/woblog/testsmali/InstanceObject;->aInt:I
 58 
 59     invoke-static {v2}, Ljava/lang/String;->valueOf(I)Ljava/lang/String;
 60 
 61     move-result-object v2
 62 
 63     invoke-static {v1, v2}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
 64 
 65     .line 42
 66     const-string v1, "TAG"
 67 
 68     iget-wide v2, v0, Lcom/woblog/testsmali/InstanceObject;->aLong:J
 69 
 70     invoke-static {v2, v3}, Ljava/lang/String;->valueOf(J)Ljava/lang/String;
 71 
 72     move-result-object v2
 73 
 74     invoke-static {v1, v2}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
 75 
 76     .line 43
 77     const-string v1, "TAG"
 78 
 79     iget v2, v0, Lcom/woblog/testsmali/InstanceObject;->aFloat:F
 80 
 81     invoke-static {v2}, Ljava/lang/String;->valueOf(F)Ljava/lang/String;
 82 
 83     move-result-object v2
 84 
 85     invoke-static {v1, v2}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
 86 
 87     .line 44
 88     const-string v1, "TAG"
 89 
 90     iget-wide v2, v0, Lcom/woblog/testsmali/InstanceObject;->aDouble:D
 91 
 92     invoke-static {v2, v3}, Ljava/lang/String;->valueOf(D)Ljava/lang/String;
 93 
 94     move-result-object v2
 95 
 96     invoke-static {v1, v2}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
 97 
 98     .line 45
 99     const-string v1, "TAG"
100 
101     iget-object v2, v0, Lcom/woblog/testsmali/InstanceObject;->object:Ljava/lang/Object;
102 
103     invoke-static {v2}, Ljava/lang/String;->valueOf(Ljava/lang/Object;)Ljava/lang/String;
104 
105     move-result-object v2
106 
107     invoke-static {v1, v2}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
108 
109     .line 46
110     const-string v1, "TAG"
111 
112     iget-boolean v2, v0, Lcom/woblog/testsmali/InstanceObject;->aBoolean:Z
113 
114     invoke-static {v2}, Ljava/lang/String;->valueOf(Z)Ljava/lang/String;
115 
116     move-result-object v2
117 
118     invoke-static {v1, v2}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
119 
120     .line 47
121     const-string v1, "TAG"
122 
123     iget-byte v2, v0, Lcom/woblog/testsmali/InstanceObject;->aByte:B
124 
125     invoke-static {v2}, Ljava/lang/String;->valueOf(I)Ljava/lang/String;
126 
127     move-result-object v2
128 
129     invoke-static {v1, v2}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
130 
131     .line 48
132     const-string v1, "TAG"
133 
134     iget-char v2, v0, Lcom/woblog/testsmali/InstanceObject;->aChar:C
135 
136     invoke-static {v2}, Ljava/lang/String;->valueOf(C)Ljava/lang/String;
137 
138     move-result-object v2
139 
140     invoke-static {v1, v2}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
141 
142     .line 49
143     const-string v1, "TAG"
144 
145     iget-short v2, v0, Lcom/woblog/testsmali/InstanceObject;->aShort:S
146 
147     invoke-static {v2}, Ljava/lang/String;->valueOf(I)Ljava/lang/String;
148 
149     move-result-object v2
150 
151     invoke-static {v1, v2}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
152 
153     .line 50
154     return-void
155 .end method
156 
157 .method private testStatusFieldOperator()V
158     .locals 4
159 
160     .prologue
161     const/4 v2, 0x1
162 
163     .line 54
164     sput v2, Lcom/woblog/testsmali/StatusObject;->aInt:I
165 
166     .line 55
167     const-wide/16 v0, 0x30a6
168 
169     sput-wide v0, Lcom/woblog/testsmali/StatusObject;->aLong:J
170 
171     .line 56
172     const v0, 0x4640e1cd
173 
174     sput v0, Lcom/woblog/testsmali/StatusObject;->aFloat:F
175 
176     .line 57
177     const-wide v0, 0x40fe29a333333333L    # 123546.2
178 
179     sput-wide v0, Lcom/woblog/testsmali/StatusObject;->aDouble:D
180 
181     .line 58
182     new-instance v0, Ljava/lang/Object;
183 
184     invoke-direct {v0}, Ljava/lang/Object;-><init>()V
185 
186     sput-object v0, Lcom/woblog/testsmali/StatusObject;->object:Ljava/lang/Object;
187 
188     .line 59
189     sput-boolean v2, Lcom/woblog/testsmali/StatusObject;->aBoolean:Z
190 
191     .line 60
192     const/4 v0, 0x3
193 
194     sput-byte v0, Lcom/woblog/testsmali/StatusObject;->aByte:B
195 
196     .line 61
197     const/16 v0, 0x63
198 
199     sput-char v0, Lcom/woblog/testsmali/StatusObject;->aChar:C
200 
201     .line 62
202     sput-short v2, Lcom/woblog/testsmali/StatusObject;->aShort:S
203 
204     .line 64
205     const-string v0, "TAG"
206 
207     sget v1, Lcom/woblog/testsmali/StatusObject;->aInt:I
208 
209     invoke-static {v1}, Ljava/lang/String;->valueOf(I)Ljava/lang/String;
210 
211     move-result-object v1
212 
213     invoke-static {v0, v1}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
214 
215     .line 65
216     const-string v0, "TAG"
217 
218     sget-wide v2, Lcom/woblog/testsmali/StatusObject;->aLong:J
219 
220     invoke-static {v2, v3}, Ljava/lang/String;->valueOf(J)Ljava/lang/String;
221 
222     move-result-object v1
223 
224     invoke-static {v0, v1}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
225 
226     .line 66
227     const-string v0, "TAG"
228 
229     sget v1, Lcom/woblog/testsmali/StatusObject;->aFloat:F
230 
231     invoke-static {v1}, Ljava/lang/String;->valueOf(F)Ljava/lang/String;
232 
233     move-result-object v1
234 
235     invoke-static {v0, v1}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
236 
237     .line 67
238     const-string v0, "TAG"
239 
240     sget-wide v2, Lcom/woblog/testsmali/StatusObject;->aDouble:D
241 
242     invoke-static {v2, v3}, Ljava/lang/String;->valueOf(D)Ljava/lang/String;
243 
244     move-result-object v1
245 
246     invoke-static {v0, v1}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
247 
248     .line 68
249     const-string v0, "TAG"
250 
251     sget-object v1, Lcom/woblog/testsmali/StatusObject;->object:Ljava/lang/Object;
252 
253     invoke-static {v1}, Ljava/lang/String;->valueOf(Ljava/lang/Object;)Ljava/lang/String;
254 
255     move-result-object v1
256 
257     invoke-static {v0, v1}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
258 
259     .line 69
260     const-string v0, "TAG"
261 
262     sget-boolean v1, Lcom/woblog/testsmali/StatusObject;->aBoolean:Z
263 
264     invoke-static {v1}, Ljava/lang/String;->valueOf(Z)Ljava/lang/String;
265 
266     move-result-object v1
267 
268     invoke-static {v0, v1}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
269 
270     .line 70
271     const-string v0, "TAG"
272 
273     sget-byte v1, Lcom/woblog/testsmali/StatusObject;->aByte:B
274 
275     invoke-static {v1}, Ljava/lang/String;->valueOf(I)Ljava/lang/String;
276 
277     move-result-object v1
278 
279     invoke-static {v0, v1}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
280 
281     .line 71
282     const-string v0, "TAG"
283 
284     sget-char v1, Lcom/woblog/testsmali/StatusObject;->aChar:C
285 
286     invoke-static {v1}, Ljava/lang/String;->valueOf(C)Ljava/lang/String;
287 
288     move-result-object v1
289 
290     invoke-static {v0, v1}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
291 
292     .line 72
293     const-string v0, "TAG"
294 
295     sget-short v1, Lcom/woblog/testsmali/StatusObject;->aShort:S
296 
297     invoke-static {v1}, Ljava/lang/String;->valueOf(I)Ljava/lang/String;
298 
299     move-result-object v1
300 
301     invoke-static {v0, v1}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
302 
303     .line 73
304     return-void
305 .end method

方法调用

在方法调用者我们可以看到有：

1 invoke-super {p0, p1}, Lcom/woblog/testsmali/BaseActivity;->onCreate(Landroid/os/Bundle;)V
2 
3 invoke-virtual {p0, v0}, Lcom/woblog/testsmali/MainActivity;->setContentView(I)V
4 
5 invoke-direct {p0}, Lcom/woblog/testsmali/MainActivity;->initMove()V
6 
7 invoke-static {}, Lcom/woblog/testsmali/TimeUtil;->getCurrentTime()J
8 
9 invoke-interface {v0}, Lcom/woblog/testsmali/ICallback;->onSuccess()V

数据转换

数据转换指令用于将一种数据类型转换为另一个类型，unop vA, vB:寄存器存储要转换的数据，vA存储转换后的数据 
neg-int:整形求补 
not-int:整形求反 
neg-long:长整型求补 
not-long:长整型求反 
neg-float:单精度求补 
not-float: 
neg-double: 
not-double:

int-to-long:整型转为长整型 
int-to-float:整型转单精度浮点型 
int-to-double:整型转双精度浮点型

int-to-byte:整型转字节型 
int-to-char:整型转字符串 
int-to-short:整型转短整型

long-to-int 
long-to-float 
long-to-double

float-to-int 
float-to-long 
float-to-double

double-to-int 
double-to-long 
double-to-float

 1 private void testConvert() {
 2     int i1=13;
 3 
 4     //int 转其他类型
 5     long l1 = i1;
 6     float f1 = i1;
 7     double d1 = i1;
 8 
 9     byte b1 = (byte) i1;
10     char c1 = (char) i1;
11     short s1 = (short) i1;
12 
13     //long 转其他类型
14     long l2 = 234444556576L;
15     int i2 = (int) l2;
16     float f2 = l2;
17     double d2 = l2;
18 
19     //float 转其他类型
20     float f10 =234399.9F;
21     int i10 = (int) f10;
22     long l10 = (long) f10;
23     double d10 = f10;
24 
25     //double 转其他类型
26     double d20 = 123344445.324;
27     int i20 = (int) d20;
28     long l20 = (long) d20;
29     float f20 = (float) d20;
30 }
  1 .method private testConvert()V
  2     .locals 29
  3 
  4     .prologue
  5     .line 30
  6     const/16 v16, 0xd
  7 
  8     .line 33
  9     .local v16, "i1":I
 10     move/from16 v0, v16
 11 
 12     int-to-long v0, v0
 13 
 14     move-wide/from16 v20, v0
 15 
 16     .line 34
 17     .local v20, "l1":J
 18     move/from16 v0, v16
 19 
 20     int-to-float v12, v0
 21 
 22     .line 35
 23     .local v12, "f1":F
 24     move/from16 v0, v16
 25 
 26     int-to-double v4, v0
 27 
 28     .line 37
 29     .local v4, "d1":D
 30     move/from16 v0, v16
 31 
 32     int-to-byte v2, v0
 33 
 34     .line 38
 35     .local v2, "b1":B
 36     move/from16 v0, v16
 37 
 38     int-to-char v3, v0
 39 
 40     .line 39
 41     .local v3, "c1":C
 42     move/from16 v0, v16
 43 
 44     int-to-short v0, v0
 45 
 46     move/from16 v28, v0
 47 
 48     .line 42
 49     .local v28, "s1":S
 50     const-wide v24, 0x3695fc0920L
 51 
 52     .line 43
 53     .local v24, "l2":J
 54     move-wide/from16 v0, v24
 55 
 56     long-to-int v0, v0
 57 
 58     move/from16 v18, v0
 59 
 60     .line 44
 61     .local v18, "i2":I
 62     move-wide/from16 v0, v24
 63 
 64     long-to-float v14, v0
 65 
 66     .line 45
 67     .local v14, "f2":F
 68     move-wide/from16 v0, v24
 69 
 70     long-to-double v8, v0
 71 
 72     .line 48
 73     .local v8, "d2":D
 74     const v13, 0x4864e7fa    # 234399.9f
 75 
 76     .line 49
 77     .local v13, "f10":F
 78     float-to-int v0, v13
 79 
 80     move/from16 v17, v0
 81 
 82     .line 50
 83     .local v17, "i10":I
 84     float-to-long v0, v13
 85 
 86     move-wide/from16 v22, v0
 87 
 88     .line 51
 89     .local v22, "l10":J
 90     float-to-double v6, v13
 91 
 92     .line 54
 93     .local v6, "d10":D
 94     const-wide v10, 0x419d6858f54bc6a8L    # 1.23344445324E8
 95 
 96     .line 55
 97     .local v10, "d20":D
 98     double-to-int v0, v10
 99 
100     move/from16 v19, v0
101 
102     .line 56
103     .local v19, "i20":I
104     double-to-long v0, v10
105 
106     move-wide/from16 v26, v0
107 
108     .line 57
109     .local v26, "l20":J
110     double-to-float v15, v10
111 
112     .line 58
113     .local v15, "f20":F
114     return-void
115 .end method

数据运行指令

算术运算：加，减，乘，除，模，移位等 
逻辑运算：与，或，非，异或等

binop vAA, vBB, vCC：将vBB寄存器与vCC寄存器进行运算，结果保存到vAA

上面的指令会根据数据类型的不同在基础后面添加数据类型后缀，如：-int或-long 
add-type vBB：vBB寄存器与vCC寄存器值进行加法运算,+ 
sub-type vBB:- 
mul-type vBB:* 
div-type vBB:/ 
rem-type vBB:% 
and-type vBB:and 
or-type vBB:or 
xor-type vBB:xor 
shl-type vBB:左移vCC位，<< 
shr-type vBB:右移vCC位，>> 
ushr-type vBB:无符号>>

其中type可以为int,long,float,double

binop/2addr vA, vB:将vA寄存器与vB寄存器进行运算，结果保存到vA 
binop/lit16 vA, vB, #+CCCC:将vB寄存器与常量CCCC进行运算，结果保存到vA 
binop/lit8 vAA, vBB, #+CC:将vBB寄存器与常量CC进行运行，结果保存到vAA

Dalvik hello world

首先写一个基本框架

 1 .class public LHelloWorld; #定义类名
 2 .super Ljava/lang/Object; #定义父类
 3 .method public static main([Ljava/lang/String;)V #声明静态的main函数
 4     .locals 4 #使用的寄存器个数，包括一个参数寄存器
 5     .param p0, "args" #一个参数
 6 
 7     .prologue #代码起始指令
 8 
 9 
10     # 这里是代码主体
11 
12 
13     return-void
14 .end method

完整版如下：

 1 .class public LHelloWorld; #定义类名
 2 .super Ljava/lang/Object; #定义父类
 3 .method public static main([Ljava/lang/String;)V #声明静态的main函数
 4     .locals 4 #使用的寄存器个数，包括一个参数寄存器
 5     .param p0, "args" #一个参数
 6 
 7     .prologue #代码起始指令
 8 
 9 
10     const-string v1, "Hello World"
11 
12     sget-object v0, Ljava/lang/System;->out:Ljava/io/PrintStream;
13 
14     invoke-virtual {v0,v1}, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
15 
16 
17     return-void
18 .end method

编译smali

我们去官网下载smali.jar，然后运行

java -jar smali.jar -o classes.dex HelloWorld.smali

编译完后我们把classes.dex push到手机里面

adb push classes.dex /data/local/

运行

dalvikvm -cp /data/local/classes.dex HelloWorld

加强版本

 1 .class public LHelloWorld; #定义类名
 2 .super Ljava/lang/Object; #定义父类
 3 .method public static main([Ljava/lang/String;)V #声明静态的main函数
 4     .locals 10 #使用的寄存器个数，包括一个参数寄存器
 5     .param p0, "args" #一个参数
 6 
 7     .prologue #代码起始指令
 8 
 9     sget-object v0, Ljava/lang/System;->out:Ljava/io/PrintStream;
10 
11     # 空指令
12 
13     nop
14 
15     nop
16 
17     nop
18 
19 
20     # 数据定义指令
21 
22     const/4 v2, 0x3
23 
24     const/16 v3, 0xffff ##不能大于65535
25 
26     #大于65535用-wide
27 
28     const-wide v4, 0x10000
29 
30 
31     # 定义一个类 类型
32 
33     const-class v5, Ljava/lang/String;
34 
35 
36     # 数据操作指令
37 
38     move v6, v2
39 
40     new-instance v7, Ljava/lang/StringBuilder;
41 
42     invoke-direct {v7}, Ljava/lang/StringBuilder;-><init>()V
43 
44     const-string v8, "u8fd9u662fu4e00u4e2au624bu5199u7684u0073u006du0061u006cu0069u5b9eu4f8b"
45 
46     invoke-virtual {v7, v8}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;
47 
48     move-result-object v7
49 
50     invoke-virtual {v7}, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;
51 
52     move-result-object v9
53 
54     invoke-virtual {v0, v9}, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
55 
56 
57     # 打印字符串
58 
59     const-string v1, "Hello World"
60 
61 
62     invoke-virtual {v0,v1}, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
63 
64 
65     return-void
66 .end method

https://blog.csdn.net/woblog/article/details/52106571

【推广】 免费学中医，健康全家人
原文地址：https://www.cnblogs.com/eustoma/p/8990713.html