Implement CALLMETHOD, SH_STRUCTREF and PUSHSTRUCTPAGE instructions.
Constructors are a bit tricky since SH_LOCALCREATE has to implicitly
call an arbitrary number of functions before it returns (just changing
the instruction pointer only allows for calling a single function).
To get around this, there is now a vm_call() function which is used to
call a function synchronously, before returning from the current
instruction.
Methods are implemented as functions, except that they get a struct page
as local variable -1.
Destructors are still not implemented.
Random note: The SDK compiler generates some pretty strange code for
'n++' when 'n' is a reference:
instruction state of stack after instruction
----------- --------------------------------
PUSHLOCALPAGE ; P(ref n)
PUSH <variable index of n> ; P(ref n),V(ref n)
REFREF ; P(n),V(n)
DUP2 ; P(n),V(n),P(n),V(n)
REF ; P(n),V(n),n
DUP_X2 ; n,P(n),V(n),n
POP ; n,P(n),V(n)
INC ; n
POP ;
This would seem to be completely equivalent to the following:
PUSHLOCALPAGE
PUSH <variable index of n>
REFREF
INC
An assortment of instructions have been implemented so far, mostly basic
stuff such as stack management. The following program can be executed:
int main(void)
{
hello(2);
for (;;) {
system.Peek();
system.Sleep(1);
}
return 0;
}
void hello(int n)
{
int i;
for (i = 0; i < n; i++) {
system.Output("Hello, world! " + string(i));
}
}
Nunuhara Cabbage