Compute expected type for variables

src/variables.h

Index: src/variables.h
diff --git a/src/variables.h b/src/variables.h
index 39451d5dfb1df987e0a2528365be3354760e019f..57fd44c2dfeee0aaa334a7277ca12d5422ad71a4 100644
--- a/src/variables.h
+++ b/src/variables.h
@@ -29,6 +29,7 @@
 #define V8_VARIABLES_H_
 
 #include "zone.h"
+#include "types.h"
 #include "interface.h"
 
 namespace v8 {
@@ -143,6 +144,9 @@ class Variable: public ZoneObject {
     local_if_not_shadowed_ = local;
   }
 
+  Handle<Type> expected_type() { return expected_type_; }
+  void set_expected_type(Handle<Type> type) { expected_type_ = type; }
+
   Location location() const { return location_; }
   int index() const { return index_; }
   InitializationFlag initialization_flag() const {
@@ -162,6 +166,7 @@ class Variable: public ZoneObject {
   Handle<String> name_;
   VariableMode mode_;
   Kind kind_;
+  Handle<Type> expected_type_;  // Intersection of all reads

[Jakob Kummerow, 2013/07/09 16:01:50]

nit: trailing full stop. And, uhm, "Union" ;-)

   Location location_;
   int index_;
   int initializer_position_;