ARM Compiler toolchain v4.1 for µVision Using the Compiler

Using the Inline and Embedded Assemblers of the ARM Compiler
7.47 Calling a nonvirtual member function
Example 7-6 shows code that can be used to call a nonvirtual function in either a virtual or
nonvirtual base:
Example 7-6 Calling a nonvirtual function
// rp contains a D* and we want to do the equivalent of rp->f() where f is a
// nonvirtual function
// all arguments other than the this pointer are already set up
// assumes f does not return a struct
if __mcall_is_in_vbase(D, f)
LDR r12, [rp]
// fetch vtable pointer
LDR r0, [r12, #-__mcall_offsetof_vbase(D, f)] // fetch the vbase offset
ADD r0, r0, rp
// do this adjustment
else
ADD r0, rp, #__mcall_this_offset(D, f)
endif
BL __cpp(&D::f)
// set up and adjust this
// pointer for D*
// call D::f
7.47.1 See also
Concepts
• Calling nonstatic member functions in embedded assembler on page 7-53.
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