Program compilation in c

Source code is not included by the compiler, therefore compiled code is more secure than interpreted code. The compiler produces an executable file, and therefore the program can be run without the need of the source code.

Object code needs to be produced before a final executable file, this can be a low process. When an error is found, the whole program has to be re-compiled again and again. The interpreter transforms the high-level program into an intermediate language that it then executes, or it could parse the high-level source code and then performs the commands directly, which is done line by line Or statement by statement. An interpreter also produces a low-level program from a high-level program, but the working of the interpreter is not High language similar to that of the compiler.

An interpreter processes the high-level program line-by-line and simultaneously, produces the low-level program. Debugging check errors is easier since the interpreter stops when it finds an error.

Easier to create multi-platform run on the different operating system code. Compilation Process in C. If an error is found then there is no need to retranslate the whole program like a compiler. Interpreters are generally slower than compiled programs because interpreter translates one line at a time. Source code is required for the program to be executed, and this source code can be read by any other programmer so it is not a secured.

A loader loads the programs into the main memory from the storage device. The OS transparently calls the loader when needed.

A loader is a program used by an operating system to load programs from a secondary to main memory so as to be executed. Linker links and combines objects generated by a compiler into a single executable.

A linker is also responsible to link and combine all modules of a program if written separately. Usually, large applications are written into small modules and are then compiled into object codes.

A linker is a program that combines these object modules to form an executable. The linker is a program that links together several object modules and libraries to form a single, coherent, executable program.

The loader is a program that brings an executable file residing on a disk into memory. Loading places data and machine instructions into the memory.

The preprocessor handles the preprocessor directives, like include and define. The preprocessor works on a stream of preprocessing tokens. Macro substitution is defined as replacing tokens with other tokens the operator enables merging two tokens when it make sense. After all this, the preprocessor produces a single output that is a stream of tokens resulting from the transformations described above.

It also adds some special markers that tell the compiler where each line came from so that it can use those to produce sensible error messages. The compilation step is performed on each output of the preprocessor. Then invokes underlying back-end assembler in toolchain that assembles that code into machine code producing actual binary file in some format ELF, COFF, a. This object file contains the compiled code in binary form of the symbols defined in the input.

Symbols in object files are referred to by name. Object files can refer to symbols that are not defined. This is the case when you use a declaration, and don't provide a definition for it. The compiler doesn't mind this, and will happily produce the object file as long as the source code is well-formed.

Or we can say that the C compiler converts the pre-processed code into assembly code. The assembly code is converted into object code by using an assembler. The name of the object file generated by the assembler is the same as the source file. The extension of the object file in DOS is '. If the name of the source file is 'hello. Mainly, all the programs written in C use library functions. These library functions are pre-compiled, and the object code of these library files is stored with '.

The main working of the linker is to combine the object code of library files with the object code of our program. Sometimes the situation arises when our program refers to the functions defined in other files; then linker plays a very important role in this.

It links the object code of these files to our program. Therefore, we conclude that the job of the linker is to link the object code of our program with the object code of the library files and other files. The output of the linker is the executable file. The name of the executable file is the same as the source file but differs only in their extensions.

In DOS, the extension of the executable file is '. For example, if we are using printf function in a program, then the linker adds its associated code in an output file.

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