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