ARM Compiler toolchain v4.1 for µVision Using the Compiler

Using the Inline and Embedded Assemblers of the ARM Compiler
7.43 __mcall_offsetof_vbase(D, f)
Where D is a class type and f is a nonstatic member function defined in a virtual base class of D,
in other words __mcall_is_in_vbase(D,f) returns {TRUE}.
__mcall_offsetof_vbase() returns the negative offset from the value of the vtable pointer of the
vtable slot that holds the base offset (from the beginning of a D object to the start of the base that
f is defined in).
The base offset is the this adjustment necessary when making a call to f with a pointer to a D.
Note
The offset returns a positive number that then has to be subtracted from the value of the vtable
pointer.
7.43.1 See also
Tasks
• Calling a nonvirtual member function on page 7-54
• Calling a virtual member function on page 7-55.
Concepts
• Compiler-supported keywords for calling class member functions in embedded assembler
on page 7-47.
ARM DUI 0375C Copyright © 2007-2008, 2011 ARM. All rights reserved. 7-50
ID061811
Non-Confidential