A brief introduction to Smali syntax

Source: Internet
Author: User

Smali language is actually the register language of Davlik;

The Smali language is the Android app. The APK is compiled with a Smali folder in Apktool, which is a file that ends in. Smali, and the file's display language.

The Smali syntax is briefly described as follows :

Davlik bytecode, registers are 32-bit, can support any type, 64-bit type (long/double) is represented by 2 registers;

There are two types of Dalvik bytecode: primitive type; reference type (including objects and arrays)

Primitive Type:v void can only be used for return value types

Z Boolean

B byte

S Short

C Char

I int

J Long (64-bit)

F float

D double (64-bit)

Object type : Lpackage/name/objectname; Equivalent to Package.name.ObjectName in Java, as explained below:

L: Indicates that this is an object type

Package/name: The package in which the object resides

;: Indicates the end of the object name

representation of the array:

[I : Represents a shaped one-dimensional array, equivalent to the Java int[];

for multidimensional arrays, just add [ on the line,[I = int[]; note: A maximum of 255 per dimension;

Representation of an array of objects:

[Ljava/lang/string represents an array of objects of a String;

Representation of the method:

lpackage/name/objectname;-->methodname (III) Z is detailed below:

Lpackage/name/objectname expression type

MethodName represents the method name

III represents the parameter (represented here as 3 integer parameters)

Note: The parameters of the method are one after the other, the middle is not separated;

representation of a field:


That means: Package name, field name, and field type

There are two ways to specify how many registers are available in a method:

The. Registers directive specifies the total number of registers in the method

The. Locals instruction shows the total number of non-parameter registers in the method, appearing in the first line of the method

Parameter of the method:

When a method is called, the parameters of the method are placed in the last n registers;

For example, a method has 2 parameters, 5 registers (V0~V4)

Then, the parameter will be placed in the last 2 registers (V3 and V4)

The first parameter in a non-static method always calls the object of the method;

Description: For static methods other than the implied this parameter, the others are the same

How registers are named:

V naming

P Naming the first register is the first parameter register in a method

Comparison: The use of the P name is to prevent later if the register is added in the method, it is necessary to re-numbering the parameter register disadvantage

In particular: long and double types are 64-bit and require 2 registers

For example, for non-static methods

Lmyobject-->mymethod (IJZ) V;

There are 4 parameters: Lmyobject,int,long,bool; 5 registers are required to store the parameters;

P0 this

P1 I (int)

P2,P3 J (Long)


A brief introduction to Smali syntax

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.