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About Linker and Loader
Linker and loader are the utility software programs that have a crucial role to play in the program execution. A program’s source code passes through many stages including assembler, compiler, loader, linker, in no particular order, before the execution of the program takes place. The linker accepts the object codes that the assembler generates and combines the codes to produce the module that is executable. Alternatively, the loader loads the module that is executable to the main memory for the purpose of execution.
The assembler generates the source program object code and passes the same to the linker, which in turn accepts the object code and generates the code that is executable for the program, and then passes that to the loader. The Linkers and Loaders programs of the high-level language contain built-in header files and libraries. The source program may have a few library functions that have their definitions stored in the libraries that are built-in. The linker connects these functions to those built-in libraries. If the built-in libraries are not there, the linker informs the compiler, which generates the error. The large programs often consist of subprograms called modules. The generation of the source program object modules takes place with the compilation and assembly of the modules. The linker has to link or combine all object modules for generating a source program executable file.  There are two types of linkers including linkage editor and dynamic linker. Linkage editor is basically a linker that generates the executable, relocatable module. And dynamic linker postpones or defers the linkage of a few external modules until the generation of executable modules. The linking happens during the runtime or load time.
The programs that require execution has to reside in the computer main memory. The loader has to load the module or executable file of a program that the linker generates to the main memory for execution purposes. Moreover, it allots the memory space to the module that is executable in the main memory. There are three primary loading approaches: absolute loading, relocatable loading, and dynamic runtime loading.
The approach of absolute loading loads the program executable file to the same location of the main memory every time. However, it has certain demerits. For instance, a programmer needs to be aware of the allotment strategy to load the modules to the main memory. If the program that needs to be modified requires deletion or insertion, the program addresses need to be altered. In relocatable loading, the assembler or compiler does not generate the actual address of the main memory. The address produced is relative. In dynamic runtime loading, the execution of the instruction of an executive module generates the program absolute address. It is possible to load the executable or loadable module into any area of the main memory.
In a nutshell, the linker accepts the program object modules from the assembler and connects the same together for generating a program executable module. The loader then loads the executable module into the main memory for execution purposes.
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