Address Binding and its Types

In this article, We are going to cover address binding with the help of an example and Its types like compile time, load time, and execution time address binding. Let’s discuss one by one.

Address Binding :
The Association of program instruction and data to the actual physical memory locations is called the Address Binding. Let’s consider the following example given below for better understanding.

Consider a program P1 has the set of instruction such that I1, I2, I3, I4, and program counter value is 10, 20, 30, 40 respectively.

Program P1
I1 --> 10 
I2 --> 20 
I3 --> 30 
I4 --> 40

Program Counter = 10, 20, 30, 40

Types of Address Binding :

Address Binding divided into three types as follows.

1. Compile-time Address Binding
2. Load time Address Binding
3. Execution time Address Binding

Compile-time Address Binding :

• If the compiler is responsible for performing address binding then it is called compile-time address binding.
• It will be done before loading the program into memory.
• The compiler requires interacts with an OS memory manager to perform compile-time address binding.

Load time Address Binding :

• It will be done after loading the program into memory.
• This type of address binding will be done by the OS memory manager i.e loader.

Execution time or dynamic Address Binding :

• It will be postponed even after loading the program into memory.
• The program will be kept on changing the locations in memory until the time of program execution.
• The dynamic type of address binding done by the processor at the time of program execution.

Note :
The majority of the Operating System practically implement dynamic loading, dynamic linking, dynamic address binding. For example – Windows, Linux, Unix all popular OS.

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