[vala] GAsync: Fix returning out parameters from async methods

[Luca Bruno <lucabru src gnome org>]

commit 9b22a27ed5ca78b74f56df7456ab321fd535d405
Author: Luca Bruno <lucabru src gnome org>
Date:   Tue Jun 28 12:09:04 2011 +0200

    GAsync: Fix returning out parameters from async methods
    
    Fixes bug 640721.

 codegen/valaccodebasemodule.vala  |    9 ++++++++-
 codegen/valagasyncmodule.vala     |    4 ++--
 tests/Makefile.am                 |    1 +
 tests/asynchronous/bug640721.vala |    8 ++++++++
 4 files changed, 19 insertions(+), 3 deletions(-)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index 84d7b30..39adeb4 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -3162,11 +3162,14 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 		return false;
 	}
 
-	void return_out_parameter (Parameter param) {
+	public void return_out_parameter (Parameter param) {
 		var delegate_type = param.variable_type as DelegateType;
 
 		var value = load_parameter (param);
 
+		var old_coroutine = is_in_coroutine ();
+		current_method.coroutine = false;
+
 		ccode.open_if (get_variable_cexpression (param.name));
 		ccode.add_assignment (new CCodeUnaryExpression (CCodeUnaryOperator.POINTER_INDIRECTION, get_variable_cexpression (param.name)), get_cvalue_ (value));
 
@@ -3179,7 +3182,9 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 
 		if (param.variable_type.is_disposable ()){
 			ccode.add_else ();
+			current_method.coroutine = old_coroutine;
 			ccode.add_expression (destroy_parameter (param));
+			current_method.coroutine = false;
 		}
 		ccode.close ();
 
@@ -3191,6 +3196,8 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 				ccode.close ();
 			}
 		}
+
+		current_method.coroutine = old_coroutine;
 	}
 
 	public override void visit_return_statement (ReturnStatement stmt) {
diff --git a/codegen/valagasyncmodule.vala b/codegen/valagasyncmodule.vala
index 68469d1..c6843ed 100644
--- a/codegen/valagasyncmodule.vala
+++ b/codegen/valagasyncmodule.vala
@@ -371,7 +371,7 @@ public class Vala.GAsyncModule : GSignalModule {
 
 
 	void generate_finish_function (Method m) {
-		push_context (new EmitContext ());
+		push_context (new EmitContext (m));
 
 		string dataname = Symbol.lower_case_to_camel_case (m.get_cname ()) + "Data";
 
@@ -418,7 +418,7 @@ public class Vala.GAsyncModule : GSignalModule {
 
 		foreach (Parameter param in m.get_parameters ()) {
 			if (param.direction != ParameterDirection.IN) {
-				ccode.add_assignment (new CCodeUnaryExpression (CCodeUnaryOperator.POINTER_INDIRECTION, new CCodeIdentifier (param.name)), new CCodeMemberAccess.pointer (data_var, get_variable_cname (param.name)));
+				return_out_parameter (param);
 				if (!(param.variable_type is ValueType) || param.variable_type.nullable) {
 					ccode.add_assignment (new CCodeMemberAccess.pointer (data_var, get_variable_cname (param.name)), new CCodeConstant ("NULL"));
 				}
diff --git a/tests/Makefile.am b/tests/Makefile.am
index e3d6a5a..309c72c 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -114,6 +114,7 @@ TESTS = \
 	asynchronous/bug613484.vala \
 	asynchronous/bug620740.vala \
 	asynchronous/bug639591.vala \
+	asynchronous/bug640721.vala \
 	asynchronous/bug641182.vala \
 	asynchronous/bug646945.vala \
 	asynchronous/bug652252.vala \
diff --git a/tests/asynchronous/bug640721.vala b/tests/asynchronous/bug640721.vala
new file mode 100644
index 0000000..d7ff612
--- /dev/null
+++ b/tests/asynchronous/bug640721.vala
@@ -0,0 +1,8 @@
+async void foo (out int i) {
+}
+
+void main () {
+	var loop = new MainLoop ();
+	foo ((s,r) => { foo.end (r, null); loop.quit (); });
+	loop.run ();
+}