Method find_variable_scope

src/CGContext.cpp:482–522

-------------------------------------------------------------- find the scope of a variable in relative to the current context * return: -1 if is global variable * 0 if from current function parameters * 1 if from top level block of same function * ... * n if from block of depth n * INVISIBLE if not visible in current context * IN

  *          active on stack frame neither
  **************************************************************/
int
CGContext::find_variable_scope(const Variable* var) const
{
	if (var->is_global()) {
		return -1;
	}
	Function *func = get_current_func();
	assert(func);

	int i;
	for (i=0; i<(int)func->param.size(); i++) {
		if (func->param[i]->match(var)) {
			return 0;
		}
	}

	// check if visible in current function
	const Block* b = get_current_block();
	i = 1;
	do {
		if (find_variable_in_set(b->local_vars, var) != -1) {
			return i;
		}
		b = b->parent;
		i++;
	} while (b);

	// check if exist on one of the stack frames
	for (i=call_chain.size()-1; i>=0; i--) {
		b = call_chain[i];
		do {
			if (find_variable_in_set(b->local_vars, var) != -1) {
				return INVISIBLE;
			}
			b = b->parent;
			i++;
		} while (b);
	}

	return INACTIVE;
}

void CGContext::extend_call_chain(const CGContext& cg_context)
{