Compiler Program
Compiler
A compiler is a program that reads a program written in one language the source language-and translates
into an equivalent program in another language-the target language. The translation process should also report the presence of errors in the source program.
Interpreter
An interpreter is a program that executes other programs. The interpreter and the underlying machine are combined into a virtual machine and simulate the execution of the input program on the virtual machine.
In general, the source language is any high level language, and the object language is an assembly/ machine language. We can show the general process of compilation by using following diagram.
Pre-processor is a program that processes its input data to produce output that is used as input to another program (compiler). The output is said to be a preprocessed form of the input data, which is generally used by compiler. Very basic work of pre-processor is to insert the files which are named in source program.
For example, let in source program, it is written #include “stdio.h”. The preprocessor replaces this file by its contents in the produced output.
The basic work of a linker is to merge object codes (that has not even been connected), produced by compiler, assembler, standard library functions, and operating system resources.
The codes generated by compiler, assembler, and linker are generally re-locatable by its nature, mean to say, the starting location of these codes are not determined, means, they can be anywhere in the computer
memory. Thus, the basic task of the loader is to find/calculate the exact address of these memory locations.
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