Remove some dead code.

src/variables.h

-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
@@ skipping 14 matching lines @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifndef V8_VARIABLES_H_
 #define V8_VARIABLES_H_
 
 #include "zone.h"
 
 namespace v8 {
 namespace internal {
 
-// Variables and AST expression nodes can track their "type" to enable
-// optimizations and removal of redundant checks when generating code.
-
-class StaticType {
- public:
-  enum Kind {
-    UNKNOWN,
-    LIKELY_SMI
-  };
-
-  StaticType() : kind_(UNKNOWN) {}
-
-  bool Is(Kind kind) const { return kind_ == kind; }
-
-  bool IsKnown() const { return !Is(UNKNOWN); }
-  bool IsUnknown() const { return Is(UNKNOWN); }
-  bool IsLikelySmi() const { return Is(LIKELY_SMI); }
-
-  void CopyFrom(StaticType* other) {
-    kind_ = other->kind_;
-  }
-
-  static const char* Type2String(StaticType* type);
-
-  // LIKELY_SMI accessors
-  void SetAsLikelySmi() {
-    kind_ = LIKELY_SMI;
-  }
-
-  void SetAsLikelySmiIfUnknown() {
-    if (IsUnknown()) {
-      SetAsLikelySmi();
-    }
-  }
-
- private:
-  Kind kind_;
-};
-
-
 // The AST refers to variables via VariableProxies - placeholders for the actual
 // variables. Variables themselves are never directly referred to from the AST,
 // they are maintained by scopes, and referred to from VariableProxies and Slots
 // after binding and variable allocation.
 
 class Variable: public ZoneObject {
  public:
   enum Mode {
     // User declared variables:
     VAR,       // declared via 'var', and 'function' declarations
@@ skipping 88 matching lines @@
     return local_if_not_shadowed_;
   }
 
   void set_local_if_not_shadowed(Variable* local) {
     local_if_not_shadowed_ = local;
   }
 
   Expression* rewrite() const { return rewrite_; }
   void set_rewrite(Expression* expr) { rewrite_ = expr; }
 
-  StaticType* type() { return &type_; }
-
  private:
   Scope* scope_;
   Handle<String> name_;
   Mode mode_;
   Kind kind_;
 
   Variable* local_if_not_shadowed_;
 
-  // Static type information
-  StaticType type_;
-
   // Code generation.
   // rewrite_ is usually a Slot or a Property, but may be any expression.
   Expression* rewrite_;
 
   // Valid as a LHS? (const and this are not valid LHS, for example)
   bool is_valid_LHS_;
 
   // Usage info.
   bool is_accessed_from_inner_scope_;  // set by variable resolver
   bool is_used_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_VARIABLES_H_