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Prior to microcomputers, the machine manufacturer generally provided an operating system and compilers for several programming languages. On the other hand, conventions which are used as an API standard (such as stdcall) are very uniformly implemented. There are subtle differences in how various compilers implement these conventions, so it is often difficult to interface code which is compiled by different compilers. Calling conventions, type representations, and name mangling are all part of what is known as an application binary interface (ABI). This is intimately related with the assignment of sizes and formats to programming-language types.Īnother closely related topic is name mangling, which determines how symbol names in the code are mapped to symbol names used by the linker.

How the task of preparing the stack for, and restoring after, a function call is divided between the caller and the callee.

Which registers the called function must preserve for the caller (also known as: callee-saved registers or non-volatile registers).

How parameters are passed (pushed on the stack, placed in registers, or a mix of both).

The order in which atomic (scalar) parameters, or individual parts of a complex parameter, are allocated.

This article describes the calling conventions used when programming x86 architecture microprocessors.Ĭalling conventions describe the interface of called code: ( Learn how and when to remove this template message) ( February 2015) ( Learn how and when to remove this template message)

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