[vala] Do not generate C code for unreachable Vala code

[Jürg Billeter <juergbi src gnome org>]

commit cd098ddcda9464d2e37562a2117ec49d959ea11f
Author: Jürg Billeter <j bitron ch>
Date:   Mon Mar 22 22:57:47 2010 +0100

    Do not generate C code for unreachable Vala code
    
    Fixes bug 598190.

 codegen/valaccodebasemodule.vala |    2 +-
 vala/valacodenode.vala           |    6 ++++--
 vala/valaflowanalyzer.vala       |    1 +
 3 files changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index 83aafae..cb0cd24 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -1897,7 +1897,7 @@ internal class Vala.CCodeBaseModule : CCodeModule {
 		}
 
 		foreach (CodeNode stmt in b.get_statements ()) {
-			if (stmt.error) {
+			if (stmt.error || stmt.unreachable) {
 				continue;
 			}
 			
diff --git a/vala/valacodenode.vala b/vala/valacodenode.vala
index feaf60a..f3ae4a4 100644
--- a/vala/valacodenode.vala
+++ b/vala/valacodenode.vala
@@ -1,6 +1,6 @@
 /* valacodenode.vala
  *
- * Copyright (C) 2006-2009  Jürg Billeter
+ * Copyright (C) 2006-2010  Jürg Billeter
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -39,7 +39,9 @@ public abstract class Vala.CodeNode {
 	 * been written.
 	 */
 	public SourceReference? source_reference { get; set; }
-	
+
+	public bool unreachable { get; set; }
+
 	/**
 	 * Contains all attributes that have been specified for this code node.
 	 */
diff --git a/vala/valaflowanalyzer.vala b/vala/valaflowanalyzer.vala
index af0e946..ff5f255 100644
--- a/vala/valaflowanalyzer.vala
+++ b/vala/valaflowanalyzer.vala
@@ -1023,6 +1023,7 @@ public class Vala.FlowAnalyzer : CodeVisitor {
 
 	private bool unreachable (CodeNode node) {
 		if (current_block == null) {
+			node.unreachable = true;
 			if (!unreachable_reported) {
 				Report.warning (node.source_reference, "unreachable code detected");
 				unreachable_reported = true;