Microsoft Extensions

asm-statement:
__asm assembly-instruction ;opt

__asm { assembly-instruction-list };opt

assembly-instruction-list:
assembly-instruction ;opt

assembly-instruction ; assembly-instruction-list ;opt

ms-modifier-list:
ms-modifier ms-modifier-listopt

ms-modifier:
__cdecl

__fastcall

__stdcall

__syscall (reserved for future implementations)

__oldcall (reserved for future implementations)

__unaligned (reserved for future implementations)

based-modifier

based-modifier:
__based ( based-type )

based-type:
name