[vala] Do not allow creation of objects without constructor

[Jürg Billeter <juergbi src gnome org>]

commit 4f03e2f0f66e6391a3043d8378beed062fd4bdca
Author: Jürg Billeter <j bitron ch>
Date:   Mon Aug 17 21:16:48 2009 +0200

    Do not allow creation of objects without constructor
    
    Fixes bug 578417.

 codegen/valaccodebasemodule.vala       |   28 ++++++++--------------------
 vala/valaobjectcreationexpression.vala |   10 +++++++---
 vapi/glib-2.0.vapi                     |    4 ++++
 3 files changed, 19 insertions(+), 23 deletions(-)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index a970c3a..26c5e51 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -3144,33 +3144,21 @@ internal class Vala.CCodeBaseModule : CCodeModule {
 		}
 
 		if (expr.symbol_reference == null) {
-			CCodeFunctionCall creation_call = null;
-
 			// no creation method
-			if (expr.type_reference.data_type == glist_type ||
-			    expr.type_reference.data_type == gslist_type) {
-				// NULL is an empty list
-				expr.ccodenode = new CCodeConstant ("NULL");
-			} else if (expr.type_reference.data_type is Class && expr.type_reference.data_type.is_subtype_of (gobject_type)) {
-				generate_class_declaration ((Class) expr.type_reference.data_type, source_declarations);
-
-				creation_call = new CCodeFunctionCall (new CCodeIdentifier ("g_object_new"));
-				creation_call.add_argument (new CCodeConstant (expr.type_reference.data_type.get_type_id ()));
-				creation_call.add_argument (new CCodeConstant ("NULL"));
-			} else if (expr.type_reference.data_type is Class) {
-				creation_call = new CCodeFunctionCall (new CCodeIdentifier ("g_new0"));
-				creation_call.add_argument (new CCodeConstant (expr.type_reference.data_type.get_cname ()));
-				creation_call.add_argument (new CCodeConstant ("1"));
-			} else if (expr.type_reference.data_type is Struct) {
+			if (expr.type_reference.data_type is Struct) {
 				// memset needs string.h
 				source_declarations.add_include ("string.h");
-				creation_call = new CCodeFunctionCall (new CCodeIdentifier ("memset"));
+				var creation_call = new CCodeFunctionCall (new CCodeIdentifier ("memset"));
 				creation_call.add_argument (new CCodeUnaryExpression (CCodeUnaryOperator.ADDRESS_OF, instance));
 				creation_call.add_argument (new CCodeConstant ("0"));
 				creation_call.add_argument (new CCodeIdentifier ("sizeof (%s)".printf (expr.type_reference.get_cname ())));
-			}
 
-			creation_expr = creation_call;
+				creation_expr = creation_call;
+			}
+		} else if (expr.type_reference.data_type == glist_type ||
+		           expr.type_reference.data_type == gslist_type) {
+			// NULL is an empty list
+			expr.ccodenode = new CCodeConstant ("NULL");
 		} else if (expr.symbol_reference is Method) {
 			// use creation method
 			var m = (Method) expr.symbol_reference;
diff --git a/vala/valaobjectcreationexpression.vala b/vala/valaobjectcreationexpression.vala
index 860ccf7..f986886 100644
--- a/vala/valaobjectcreationexpression.vala
+++ b/vala/valaobjectcreationexpression.vala
@@ -250,10 +250,14 @@ public class Vala.ObjectCreationExpression : Expression {
 			if (symbol_reference == null) {
 				symbol_reference = cl.default_construction_method;
 
-				if (symbol_reference != null) {
-					// track usage for flow analyzer
-					symbol_reference.used = true;
+				if (symbol_reference == null) {
+					error = true;
+					Report.error (source_reference, "`%s' does not have a default constructor".printf (cl.get_full_name ()));
+					return false;
 				}
+
+				// track usage for flow analyzer
+				symbol_reference.used = true;
 			}
 
 			if (symbol_reference != null && symbol_reference.access == SymbolAccessibility.PRIVATE) {
diff --git a/vapi/glib-2.0.vapi b/vapi/glib-2.0.vapi
index 74af2ec..8713507 100644
--- a/vapi/glib-2.0.vapi
+++ b/vapi/glib-2.0.vapi
@@ -3006,6 +3006,8 @@ namespace GLib {
 	[Compact]
 	[CCode (dup_function = "g_list_copy", free_function = "g_list_free")]
 	public class List<G> {
+		public List ();
+
 		[ReturnsModifiedPointer ()]
 		public void append (owned G data);
 		[ReturnsModifiedPointer ()]
@@ -3060,6 +3062,8 @@ namespace GLib {
 	[Compact]
 	[CCode (dup_function = "g_slist_copy", free_function = "g_slist_free")]
 	public class SList<G> {
+		public SList ();
+
 		[ReturnsModifiedPointer ()]
 		public void append (owned G data);
 		[ReturnsModifiedPointer ()]