[vala] Fix symbol resolution and enable control flow analysis for signals

[Jürg Billeter <juergbi src gnome org>]

commit d9d9acc6b71331b883c0142ec357843587aa6e36
Author: Luca Bruno <lucabru src gnome org>
Date:   Fri Dec 17 22:39:31 2010 +0100

    Fix symbol resolution and enable control flow analysis for signals
    
    Fixes bug 635820.

 vala/valaflowanalyzer.vala |    6 ++++++
 vala/valasignal.vala       |    4 +++-
 2 files changed, 9 insertions(+), 1 deletions(-)
---
diff --git a/vala/valaflowanalyzer.vala b/vala/valaflowanalyzer.vala
index 010c443..c57ade7 100644
--- a/vala/valaflowanalyzer.vala
+++ b/vala/valaflowanalyzer.vala
@@ -176,6 +176,12 @@ public class Vala.FlowAnalyzer : CodeVisitor {
 		visit_subroutine (m);
 	}
 
+	public override void visit_signal (Signal sig) {
+		if (sig.default_handler != null) {
+			visit_subroutine (sig.default_handler);
+		}
+	}
+
 	void visit_subroutine (Subroutine m) {
 		if (m.body == null) {
 			return;
diff --git a/vala/valasignal.vala b/vala/valasignal.vala
index 6530c44..a2ed64a 100644
--- a/vala/valasignal.vala
+++ b/vala/valasignal.vala
@@ -205,7 +205,9 @@ public class Vala.Signal : Symbol, Lockable {
 		foreach (Parameter param in parameters) {
 			param.accept (visitor);
 		}
-		if (default_handler != null) {
+		if (default_handler == null && body != null) {
+			body.accept (visitor);
+		} else if (default_handler != null) {
 			default_handler.accept (visitor);
 		}
 	}