Memory model of program

Memory partition model .

Memory is divided into 4 Regions , They are code areas , Global area , The stack area , Heap area .

When a process starts , There are the following assignments 4 Regions .

（ One ） Code area and global area

After the program is compiled , Will generate a exe Executable program of , Before the program is executed, it is divided into two areas , Code area and global area .

Code section

• Store the binary code of the function body , Managed by the operating system .
• Deposit CPU Machine instructions executed .
• The code area is share Of , The purpose of sharing is for programs that are frequently executed , Just have a code in memory , Remove redundant code .
• The code area is read-only Of , The purpose of read-only is to prevent the program from being modified by its instructions .

Global area

Store global variables and static variables (static int a), Contains the constant area ,（ String constant , Other constants const Decorated variable ）

const The decorated global variables are placed in the global area ,const The decorated local variables are placed in the code area .

The stack area ：

Stored is the return address of the subroutine 、 Parameters of subroutine 、 And the local variables of the program .

Heap area ：

Store dynamically allocated data for example ：new and malloc.