Throw and a small fix to If.

frog/leg/ssa/builder.dart

Index: frog/leg/ssa/builder.dart
diff --git a/frog/leg/ssa/builder.dart b/frog/leg/ssa/builder.dart
index 94f33fbbc10e8cd22fa81aa79829d2075c28ecd3..6c9c70b8b8515cd1a8c792cd576c8aded90a0108 100644
--- a/frog/leg/ssa/builder.dart
+++ b/frog/leg/ssa/builder.dart
@@ -220,7 +220,7 @@ class SsaBuilder implements Visitor {
             joinDefinitions(joinBlock, thenDefinitions, elseDefinitions);
       } else if (thenBlockJoined) {
         thenExitBlock.addGoto(graph, joinBlock);
-      } else if (elseBlockJoined) {
+      } else if (elseBlockJoined && hasElse) {
         elseExitBlock.addGoto(graph, joinBlock);
       }
     }
@@ -325,7 +325,10 @@ class SsaBuilder implements Visitor {
   }
 
   visitThrow(Throw node) {
-    compiler.unimplemented("SsaBuilder.visitThrow");
+    visit(node.expression);

[ngeoffray, 2011/11/10 13:22:37]

Note that expression may be null.

[floitsch, 2011/11/10 14:02:22]

Done.

+    add(new HThrow(pop()));
+    // A throw aborts the building of the current block.
+    block = null;
   }
 
   visitTypeAnnotation(TypeAnnotation node) {