[vala] Support implicit GValue conversion when assigning to properties

[Jürg Billeter <juergbi src gnome org>]

commit ddea34cef0d4db7d3f3da0b9da56006fc630992e
Author: Luca Bruno <lethalman88 gmail com>
Date:   Thu Jun 10 11:00:13 2010 +0200

    Support implicit GValue conversion when assigning to properties
    
    Thanks to Michal Hruby for the test case.
    
    Fixes bug 620706.

 codegen/valaccodebasemodule.vala |   14 +++++++++++++-
 tests/Makefile.am                |    1 +
 tests/objects/bug620706.vala     |   13 +++++++++++++
 3 files changed, 27 insertions(+), 1 deletions(-)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index bf7703e..6a17886 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -5484,6 +5484,11 @@ public class Vala.CCodeBaseModule : CodeGenerator {
 	 * from a vala to C point of view all expressions denoting locals, fields and
 	 * parameters are eligable to an ADDRESS_OF operator */
 	public bool is_address_of_possible (Expression e) {
+		if (gvalue_type != null && e.target_type.data_type == gvalue_type && e.value_type.data_type != gvalue_type) {
+			// implicit conversion to GValue is not addressable
+			return false;
+		}
+
 		var ma = e as MemberAccess;
 
 		if (ma == null) {
@@ -5502,7 +5507,14 @@ public class Vala.CCodeBaseModule : CodeGenerator {
 		}
 
 		var ccomma = new CCodeCommaExpression ();
-		var temp_decl = get_temp_variable (e.value_type, true, null, false);
+		DataType address_of_type;
+		if (gvalue_type != null && e.target_type != null && e.target_type.data_type == gvalue_type) {
+			// implicit conversion to GValue
+			address_of_type = e.target_type;
+		} else {
+			address_of_type = e.value_type;
+		}
+		var temp_decl = get_temp_variable (address_of_type, true, null, false);
 		var ctemp = get_variable_cexpression (temp_decl.name);
 		temp_vars.add (temp_decl);
 		ccomma.append_expression (new CCodeAssignment (ctemp, ce));
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 2430407..b24ea23 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -69,6 +69,7 @@ TESTS = \
 	objects/bug597155.vala \
 	objects/bug597161.vala \
 	objects/bug613486.vala \
+	objects/bug620706.vala \
 	errors/errors.vala \
 	errors/bug567181.vala \
 	errors/bug579101.vala \
diff --git a/tests/objects/bug620706.vala b/tests/objects/bug620706.vala
new file mode 100644
index 0000000..7ac4bc9
--- /dev/null
+++ b/tests/objects/bug620706.vala
@@ -0,0 +1,13 @@
+class Foo : Object {
+	public Value val { get; set; }
+}
+
+struct Bar {
+	int dummy;
+}
+
+void main () {
+	var f = new Foo ();
+	var b = Bar ();
+	f.val = b;
+}