// Perform a function call
private FuncFrame func_call(WFunction func)
{
ASSERT_ERR(this.state.func_depth > MAX_RECURSION, CoreErrorType.MAX_RECURSION, "Maxmimum recursion depth achieved!");
this.state.func_depth++;
// Set the size of the locals to the args count & locals count
this.locals = new WItem[func.args_size + func.locals_size];
// Then define the function arguments passed in that were on the exec stack
for (int i = 0; i < func.args_size; i++)
{
this.locals[i] = exec_stack.pop();
}
// First create a new FuncFrame to push to the function stack
FuncFrame frame = new FuncFrame(this, func.name, this.pc, this.locals, this.exec_stack, this.bytecode);
// Then push the frame to the FuncStack
this.func_stack.push(frame);
// Check if the function is native
if (func.is_native)
{
// Natively call the func
push_exec(this.native_interface.call_native_func(VM.state.current_file, func.name, this.locals));
// Becuase native functions can't implement Opcode.RETURN, we need to manually return & advance
func_return();
goto_next();
}
else
{
this.pc = 0;
this.exec_stack = new ExecStack(this);
this.bytecode = func.bytecode;
this.state.opcode_count = this.bytecode.Length;
}
return(frame);
}
public Core(VM vm, int id) : base("Core", id)
{
this.vm = vm;
this.native_interface = new NativeInterface(this.vm, this);
this.state = new CoreState(id, new CoreErrorHandler(), 0, false, 0);
this.pc = 0;
this.locals = new WItem[0];
this.traceback = new TraceBack();
this.func_stack = new FuncStack(this);
this.exec_stack = new ExecStack(this);
}
private void func_return()
{
this.state.func_depth--;
// First get the return value, by poping it from the exec stack
WItem return_value = this.exec_stack.pop();
// Then restore the state of the core
FuncFrame previous_frame = this.func_stack.pop();
this.pc = previous_frame.pc;
this.locals = previous_frame.locals;
this.exec_stack = previous_frame.exec_stack;
this.bytecode = previous_frame.bytecode;
this.state.opcode_count = this.bytecode.Length;
// Then push the returned value to the exec stack
this.exec_stack.push(return_value);
}
