[Mono-list] Quick trampoline explanation

[Ferguson, Neale]

In the x86 mono_create_method_pointer routine there is the following section of code:

 

        /*
         * Handle the return value storage area.
         */
        x86_lea_membase (p, X86_EAX, X86_EBP, stackval_pos);
        x86_mov_membase_reg (p, X86_EBP, (MINV_POS + G_STRUCT_OFFSET (MonoInvocation, retval)), X86_EAX, 4);
        if (sig->ret->type == MONO_TYPE_VALUETYPE && !sig->ret->byref) {
                MonoClass *klass  = sig->ret->data.klass;
                if (!klass->enumtype) {
                        x86_mov_reg_membase (p, X86_ECX, X86_EBP, 8, 4);
                        x86_mov_membase_reg (p, X86_EBP, stackval_pos, X86_ECX, 4);
                }
        }

To my undestanding this does:

- Get the address of the return value and set this in the Monoinvocation structure

- if we are returning a structure (not by reference) and the structure isn't a simple type then ?? [this is what I need an explanation of]

Neale Ferguson