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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

Calling Conventions

The Visual C/C++ compiler provides several different conventions for calling internal and external functions. Understanding these different approaches can help you debug your program and link your code with assembly-language routines.

The topics on this subject explain the differences between the calling conventions, how arguments are passed, and how values are returned by functions. They also discuss naked function calls, an advanced feature that enables you to write your own prolog and epilog code.

For information on calling conventions for x64 processors, see Calling Convention.

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