Smali語法學習五

#算數運算 Java代碼：

public void num(int b){
    int a = b;
    boolean b1 = true;
    Log.d("MainActivity","a + b ="+(a+b));
    Log.d("MainActivity","a - b ="+(a-b));
    Log.d("MainActivity","a * b ="+(a*b));
    Log.d("MainActivity","a / b ="+(a/b));
    Log.d("MainActivity","a % b ="+(a%b));
}

與之對應的smali代碼：

.method public num(I)V
    .locals 5                  #定義局部變量寄存器
    .param p1,"b"         #聲明參數
    .prologue                #代碼開始

    .line 30
    move v0, p1            #數據變量賦值    

    .line 31
    .local v0, "a":I        #定義局部變量
    const/4 v1, 0x1     #數據常量賦值

    .line 32
    .local v1, "b1":Z    #定義局部變量
    const-string v2, "MainActivity"    #定義字符串常量
    new-instance v3,Ljava/lang/StringBuilder;    #建立StringBuilder對象
    invoke-direct {v3},Ljava/lang/StringBuilder;-><init>()V #調用構造
    const-string v4,"a+b="    #調用虛方法  v3.append(v4)
    invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(Ljava/lang/String;)Ljava/lang/StringBuilder;
    move-result-object v3    #將返回值放入v3
    add-int v4,v0,p1        #v4=v0+v1
    invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;    # v3.append(v4)
    move-result-object v3
    invoke-virtual v3, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;
    move-result-object v3
    invoke-static {v2,v3},Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String)    #調用靜態方法
    
    .line 33
    const-string v2,"MainActivity"
    new-instance v3,Ljava/lang/StringBuilder;-><init>V
    const-string v4,"a-b="
    invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;
    move-result-object v3
    sub-int v4,v0,p1        #v4 = v0 - p1
     invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;
    move-result-object v3
    invoke-virtual v3, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;
    move-result-object v3
    invoke-static {v2,v3},Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String) 

    .line 34
    const-string v2,"MainActivity"
    new-instance v3,Ljava/lang/StringBuilder;-><init>V
    const-string v4,"a/b="
    invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;
    move-result-object v3
    div-int v4,v0,p1        #v4 = v0 / p1
     invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;
    move-result-object v3
    invoke-virtual v3, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;
    move-result-object v3
    invoke-static {v2,v3},Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String) 

    .line35
    const-string v2,"MainActivity"
    new-instance v3,Ljava/lang/StringBuilder;-><init>V
    const-string v4,"a*b="
    invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;
    move-result-object v3
    mul-int v4,v0,p1    #v4 = v0 * p1
     invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;
    move-result-object v3
    invoke-virtual v3, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;
    move-result-object v3
    invoke-static {v2,v3},Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String) 

    .line 36
    const-string v2,"MainActivity"
    new-instance v3,Ljava/lang/StringBuilder;-><init>V
    const-string v4,"a/b="
    invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;
    move-result-object v3
    rem-int v4,v0,p1        #v4 = v0 % p1
     invoke-virtual {v3,v4}, Ljava/lang/StringBuilder;->append(I)Ljava/lang/StringBuilder;
    move-result-object v3
    invoke-virtual v3, Ljava/lang/StringBuilder;->toString()Ljava/lang/String;
    move-result-object v3
    invoke-static {v2,v3},Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String) 

    .line 37
    return-void
.end method

能夠看到關於算數運算的代碼以下：

add-int v4, v0 ,p1        加法，v4 = v0 + p1
    sub-int v4, v0 ,p1        減法，v4 = v0 - p1
    mul-int v4, v0 ,p1        乘法，v4 = v0 * p1
    div-int v4, v0 ,p1        除法，v4 = v0 / p1
    rem-int v4, v0 ,p1        取餘，v4 = v0 % p1