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/* valasymbolresolver.vala
*
* Copyright (C) 2006-2007 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 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>
*/
using GLib;
/**
* Code visitor resolving symbol names.
*/
public class Vala.SymbolResolver : CodeVisitor {
Symbol root_symbol;
Symbol current_scope;
List<weak NamespaceReference> current_using_directives;
Class object_class;
/**
* Resolve symbol names in the specified code context.
*
* @param context a code context
*/
public void resolve (CodeContext! context) {
root_symbol = context.get_root ();
current_scope = root_symbol;
// TODO: don't require GLib namespace in symbol resolver
var glib_ns = root_symbol.lookup ("GLib");
if (glib_ns != null) {
object_class = (Class) glib_ns.lookup ("Object").node;
}
context.accept (this);
}
public override void visit_begin_source_file (SourceFile! file) {
current_using_directives = file.get_using_directives ();
}
public override void visit_end_source_file (SourceFile! file) {
current_using_directives = null;
}
public override void visit_begin_namespace (Namespace! ns) {
current_scope = ns.symbol;
}
public override void visit_end_namespace (Namespace! ns) {
// don't use current_scope.parent_symbol as that would be null
// if the current namespace is SourceFile.global_namespace
current_scope = root_symbol;
}
public override void visit_begin_class (Class! cl) {
current_scope = cl.symbol;
}
public override void visit_end_class (Class! cl) {
foreach (TypeReference type in cl.get_base_types ()) {
if (type.data_type is Class) {
if (cl.base_class != null) {
Report.error (type.source_reference, "%s: Classes cannot have multiple base classes (`%s' and `%s')".printf (cl.symbol.get_full_name (), cl.base_class.symbol.get_full_name (), type.data_type.symbol.get_full_name ()));
return;
}
cl.base_class = (Class) type.data_type;
}
}
if (cl.base_class == null && cl != object_class) {
var object_type = new TypeReference ();
object_type.data_type = object_class;
cl.add_base_type (object_type);
cl.base_class = object_class;
}
current_scope = current_scope.parent_symbol;
}
public override void visit_begin_struct (Struct! st) {
current_scope = st.symbol;
}
public override void visit_end_struct (Struct! st) {
current_scope = current_scope.parent_symbol;
}
public override void visit_begin_interface (Interface! iface) {
current_scope = iface.symbol;
}
public override void visit_end_interface (Interface! iface) {
current_scope = current_scope.parent_symbol;
}
public override void visit_begin_callback (Callback! cb) {
current_scope = cb.symbol;
}
public override void visit_end_callback (Callback! cb) {
current_scope = current_scope.parent_symbol;
}
public override void visit_formal_parameter (FormalParameter! p) {
if (!p.ellipsis && p.type_reference.is_ref) {
if ((p.type_reference.data_type != null &&
p.type_reference.data_type.is_reference_type ()) ||
p.type_reference.type_parameter != null) {
p.type_reference.takes_ownership = true;
} else {
p.type_reference.reference_to_value_type = true;
}
}
}
public override void visit_namespace_reference (NamespaceReference! ns) {
ns.namespace_symbol = current_scope.lookup (ns.name);
if (ns.namespace_symbol == null) {
ns.error = true;
Report.error (ns.source_reference, "The namespace name `%s' could not be found".printf (ns.name));
return;
}
}
public override void visit_type_reference (TypeReference! type) {
if (type.type_name == null || type.type_name == "void") {
// reset transfers_ownership
type.transfers_ownership = false;
return;
}
if (type.namespace_name == null) {
Symbol sym = null;
Symbol scope = current_scope;
while (sym == null && scope != null) {
sym = scope.lookup (type.type_name);
scope = scope.parent_symbol;
if (sym != null && !(sym.node is DataType) && !(sym.node is TypeParameter)) {
// ignore non-type symbols
sym = null;
}
}
if (sym == null) {
foreach (NamespaceReference ns in current_using_directives) {
if (ns.error) {
continue;
}
var local_sym = ns.namespace_symbol.lookup (type.type_name);
if (local_sym != null) {
if (sym != null) {
Report.error (type.source_reference, "`%s' is an ambiguous reference between `%s' and `%s'".printf (type.type_name, sym.get_full_name (), local_sym.get_full_name ()));
return;
}
sym = local_sym;
}
}
}
if (sym == null) {
Report.error (type.source_reference, "The type name `%s' could not be found".printf (type.type_name));
return;
}
if (sym.node is TypeParameter) {
type.type_parameter = (TypeParameter) sym.node;
} else {
type.data_type = (DataType) sym.node;
}
} else {
var ns_symbol = root_symbol.lookup (type.namespace_name);
if (ns_symbol == null) {
type.error = true;
Report.error (type.source_reference, "The namespace name `%s' could not be found".printf (type.namespace_name));
return;
}
var sym = ns_symbol.lookup (type.type_name);
if (sym == null) {
Report.error (type.source_reference, "The type name `%s' does not exist in the namespace `%s'".printf (type.type_name, type.namespace_name));
return;
}
type.data_type = (DataType) sym.node;
}
if (type.pointer_level > 0) {
if (type.data_type == null) {
type.error = true;
Report.error (type.source_reference, "Pointer to `%s' not supported".printf (type.type_name));
return;
}
var referent_type = new TypeReference ();
referent_type.data_type = type.data_type;
referent_type.pointer_level = type.pointer_level - 1;
if (type.data_type.is_reference_type ()) {
referent_type.takes_ownership = type.takes_ownership;
}
type.data_type = referent_type.data_type.get_pointer ();
type.add_type_argument (referent_type);
visit_type_reference (referent_type);
}
/* check for array */
if (type.array_rank > 0) {
var element_type = new TypeReference ();
element_type.data_type = type.data_type;
element_type.type_parameter = type.type_parameter;
foreach (TypeReference type_arg in type.get_type_arguments ()) {
element_type.add_type_argument (type_arg);
}
type.remove_all_type_arguments ();
if (type.data_type != null) {
if (type.data_type.is_reference_type ()) {
element_type.takes_ownership = type.takes_ownership;
}
type.data_type = element_type.data_type.get_array (type.array_rank);
} else {
type.data_type = element_type.type_parameter.get_array (type.array_rank);
type.type_parameter = null;
}
type.add_type_argument (element_type);
}
if (type.data_type != null && !type.data_type.is_reference_type ()) {
/* reset takes_ownership and transfers_ownership of
* value-types for contexts where types are ref by
* default (field declarations and method return types)
*/
type.takes_ownership = false;
type.transfers_ownership = false;
}
}
}
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