What goes into an object file?

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An object file contains five kinds of information.
• Header information: overall information about the file, such as the size of the code, name of the source file it was translated from, and creation date.
• Object code: Binary instructions and data generated by a compiler or assembler.
• Relocation: A list of the places in the object code that have to be fixed up when the linker changes the addresses of the object code.
• Symbols: Global symbols defined in this module, symbols to be imported from other modules or defined by the linker.
• Debugging information: Other information about the object code not needed for linking but of use to a debugger. This includes
source file and line number information, local symbols, descriptions of data structures used by the object code such as C structure
definitions.