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/* valadovamethodcallmodule.vala
*
* Copyright (C) 2006-2010 Jürg Billeter
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author:
* Jürg Billeter <j@bitron.ch>
*/
public class Vala.DovaMethodCallModule : DovaAssignmentModule {
public override void visit_method_call (MethodCall expr) {
// the bare function call
var ccall = new CCodeFunctionCall (get_cvalue (expr.call));
Method m = null;
Delegate deleg = null;
List<Parameter> params;
var ma = expr.call as MemberAccess;
var itype = expr.call.value_type;
params = itype.get_parameters ();
if (itype is MethodType) {
assert (ma != null);
m = ((MethodType) itype).method_symbol;
} else if (itype is ObjectType) {
// constructor
var cl = (Class) ((ObjectType) itype).type_symbol;
m = cl.default_construction_method;
generate_method_declaration (m, cfile);
ccall = new CCodeFunctionCall (new CCodeIdentifier (get_ccode_real_name (m)));
} else if (itype is DelegateType) {
deleg = ((DelegateType) itype).delegate_symbol;
ccall = new CCodeFunctionCall (new CCodeIdentifier ("%s_invoke".printf (get_ccode_lower_case_name (deleg))));
ccall.add_argument (get_cvalue (expr.call));
}
if (m is CreationMethod) {
var cl = (Class) m.parent_symbol;
if (cl == current_class) {
ccall.add_argument (new CCodeIdentifier ("this"));
} else {
ccall.add_argument (new CCodeCastExpression (new CCodeIdentifier ("this"), get_ccode_name (cl) + "*"));
}
} else if (m != null) {
if (m.binding == MemberBinding.INSTANCE) {
var instance = get_cvalue (ma.inner);
if (ma.member_name == "begin" && ma.inner.symbol_reference == ma.symbol_reference) {
var inner_ma = (MemberAccess) ma.inner;
instance = get_cvalue (inner_ma.inner);
}
var st = m.parent_symbol as Struct;
if (st != null && !st.is_simple_type ()) {
// we need to pass struct instance by reference
var unary = instance as CCodeUnaryExpression;
if (unary != null && unary.operator == CCodeUnaryOperator.POINTER_INDIRECTION) {
// *expr => expr
instance = unary.inner;
} else if (instance is CCodeIdentifier || instance is CCodeMemberAccess) {
instance = new CCodeUnaryExpression (CCodeUnaryOperator.ADDRESS_OF, instance);
} else {
// if instance is e.g. a function call, we can't take the address of the expression
// (tmp = expr, &tmp)
var ccomma = new CCodeCommaExpression ();
var temp_var = get_temp_variable (ma.inner.target_type);
emit_temp_var (temp_var);
ccomma.append_expression (new CCodeAssignment (get_variable_cexpression (temp_var.name), instance));
ccomma.append_expression (new CCodeUnaryExpression (CCodeUnaryOperator.ADDRESS_OF, get_variable_cexpression (temp_var.name)));
instance = ccomma;
}
}
if (ma.inner is BaseAccess) {
ccall.add_argument (new CCodeFunctionCall (new CCodeIdentifier ("%s_type_get".printf (get_ccode_lower_case_name (current_class.base_class)))));
}
ccall.add_argument (instance);
}
if (m.binding != MemberBinding.INSTANCE && m.parent_symbol is ObjectTypeSymbol) {
// support static methods in generic types
var type_symbol = (ObjectTypeSymbol) m.parent_symbol;
if (type_symbol.get_type_parameters ().size > 0 && ma.inner is MemberAccess) {
var type_ma = (MemberAccess) ma.inner;
add_generic_type_arguments (ccall, type_ma.get_type_arguments (), expr);
}
}
if (m.get_type_parameters ().size > 0) {
add_generic_type_arguments (ccall, ma.get_type_arguments (), expr);
}
}
// the complete call expression, might include casts, comma expressions, and/or assignments
CCodeExpression ccall_expr = ccall;
bool ellipsis = false;
int i = 1;
Iterator<Parameter> params_it = params.iterator ();
foreach (Expression arg in expr.get_argument_list ()) {
CCodeExpression cexpr = get_cvalue (arg);
if (params_it.next ()) {
var param = params_it.get ();
ellipsis = param.params_array || param.ellipsis;
if (!ellipsis) {
cexpr = handle_struct_argument (param, arg, cexpr);
// unref old value for non-null non-weak ref/out arguments
// disabled for arrays for now as that requires special handling
// (ret_tmp = call (&tmp), var1 = (assign_tmp = dup (tmp), free (var1), assign_tmp), ret_tmp)
if (param.direction != ParameterDirection.IN && requires_destroy (arg.value_type)
&& (param.direction == ParameterDirection.OUT || !param.variable_type.value_owned)
&& !(param.variable_type is ArrayType)) {
var unary = (UnaryExpression) arg;
var ccomma = new CCodeCommaExpression ();
var temp_var = get_temp_variable (param.variable_type, param.variable_type.value_owned);
emit_temp_var (temp_var);
cexpr = new CCodeUnaryExpression (CCodeUnaryOperator.ADDRESS_OF, get_variable_cexpression (temp_var.name));
if (param.direction == ParameterDirection.REF) {
var crefcomma = new CCodeCommaExpression ();
crefcomma.append_expression (new CCodeAssignment (get_variable_cexpression (temp_var.name), get_cvalue (unary.inner)));
crefcomma.append_expression (cexpr);
cexpr = crefcomma;
}
// call function
LocalVariable ret_temp_var = null;
if (itype.get_return_type () is VoidType) {
ccomma.append_expression (ccall_expr);
} else {
ret_temp_var = get_temp_variable (itype.get_return_type ());
emit_temp_var (ret_temp_var);
ccomma.append_expression (new CCodeAssignment (get_variable_cexpression (ret_temp_var.name), ccall_expr));
}
var cassign_comma = new CCodeCommaExpression ();
var assign_temp_var = get_temp_variable (unary.inner.value_type, unary.inner.value_type.value_owned);
emit_temp_var (assign_temp_var);
cassign_comma.append_expression (new CCodeAssignment (get_variable_cexpression (assign_temp_var.name), transform_expression (get_variable_cexpression (temp_var.name), param.variable_type, unary.inner.value_type, arg)));
// unref old value
cassign_comma.append_expression (get_unref_expression (get_cvalue (unary.inner), arg.value_type, arg));
cassign_comma.append_expression (get_variable_cexpression (assign_temp_var.name));
// assign new value
ccomma.append_expression (new CCodeAssignment (get_cvalue (unary.inner), cassign_comma));
// return value
if (!(itype.get_return_type () is VoidType)) {
ccomma.append_expression (get_variable_cexpression (ret_temp_var.name));
}
ccall_expr = ccomma;
}
if (CCodeBaseModule.get_ccode_type (param) != null) {
cexpr = new CCodeCastExpression (cexpr, CCodeBaseModule.get_ccode_type (param));
}
}
}
ccall.add_argument (cexpr);
i++;
}
if (params_it.next ()) {
var param = params_it.get ();
/* if there are more parameters than arguments,
* the additional parameter is an ellipsis parameter
* otherwise there is a bug in the semantic analyzer
*/
assert (param.params_array || param.ellipsis);
ellipsis = true;
}
if (itype.get_return_type () is GenericType) {
var ccomma = new CCodeCommaExpression ();
var temp_var = get_temp_variable (expr.value_type);
emit_temp_var (temp_var);
if (expr.value_type is GenericType) {
ccall.add_argument (get_variable_cexpression (temp_var.name));
} else {
ccall.add_argument (new CCodeUnaryExpression (CCodeUnaryOperator.ADDRESS_OF, get_variable_cexpression (temp_var.name)));
}
// call function
ccomma.append_expression (ccall_expr);
ccomma.append_expression (get_variable_cexpression (temp_var.name));
ccall_expr = ccomma;
}
if (expr.parent_node is ExpressionStatement) {
ccode.add_expression (ccall_expr);
} else {
var temp_var = get_temp_variable (expr.value_type);
var temp_ref = get_variable_cexpression (temp_var.name);
emit_temp_var (temp_var);
ccode.add_assignment (temp_ref, ccall_expr);
set_cvalue (expr, temp_ref);
}
}
}
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