Method SelectParentLocal

src/VariableSelector.cpp:965–1023

--------------------------------------------------------------

// --------------------------------------------------------------
Variable *
VariableSelector::SelectParentLocal(Effect::Access access,
				  const CGContext &cg_context,
                  const Type* type,
				  const CVQualifiers* qfer,
				  eMatchType mt,
				  const vector<const Variable*>& invalid_vars)
{
	DEPTH_GUARD_BY_TYPE_RETURN(dtSelectParentLocal, NULL);
	// Select from the local variables of the parent OR any of its block stack.
	Function& parent = *cg_context.get_current_func();
	if (parent.stack.empty()) {
		// We're choosing a local from a function whose body hasn't been built.
		// This should never happen.
		assert(!parent.stack.empty());
		return 0;
	}

	unsigned int index = rnd_upto(parent.stack.size());
	ERROR_GUARD(NULL);
	Block *block = parent.stack[index];

	// Should be "generate new block local"...
	const Type *t = NULL;
	if (block->local_vars.empty()) {
		if (CGOptions::expand_struct()) {
			Variable *var = VariableSelector::eager_create_local_struct(*block, access, cg_context, type, qfer, mt, invalid_vars);
			ERROR_GUARD(NULL);
			if (var)
				return var;
		}
		const Type* t = Type::random_type_from_type(type, true, false);
		ERROR_GUARD(NULL);
		return GenerateNewParentLocal(*block, access, cg_context, t, qfer);
	}

	if (type && type->eType == eSimple && (type->simple_type != eVoid)) {
		t = get_int_type();
	}
	else {
		t = Type::random_type_from_type(type, true, false);
		ERROR_GUARD(NULL);
	}

	Variable* var = choose_var(block->local_vars, access, cg_context, t, qfer, mt, invalid_vars);
	ERROR_GUARD(NULL);
	if (var == 0) {
#if 0
		if (CGOptions::expand_struct()) {
			var = VariableSelector::eager_create_local_struct(*block, access, cg_context, type, qfer, mt, invalid_vars);
			ERROR_GUARD(NULL);
			if (var)
				return var;
		}
#endif
		var = GenerateNewParentLocal(*block, access, cg_context, t, qfer);
	}
	return var;