Support BottomType in the VM Kernel reader

runtime/vm/kernel.h

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_KERNEL_H_
 #define RUNTIME_VM_KERNEL_H_
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/globals.h"
 #include "vm/growable_array.h"
 #include "vm/token_position.h"
 
 
 #define KERNEL_NODES_DO(M)                                                     \
   M(Name)                                                                      \
   M(DartType)                                                                  \
   M(InvalidType)                                                               \
   M(DynamicType)                                                               \
   M(VoidType)                                                                  \
+  M(BottomType)                                                                \
   M(InterfaceType)                                                             \
   M(FunctionType)                                                              \
   M(TypeParameterType)                                                         \
   M(VectorType)                                                                \
   M(TypedefType)
 
 #define KERNEL_TREE_NODES_DO(M)                                                \
   M(Library)                                                                   \
   M(Typedef)                                                                   \
   M(Class)                                                                     \
@@ skipping 2642 matching lines @@
   virtual void AcceptDartTypeVisitor(DartTypeVisitor* visitor);
   virtual void VisitChildren(Visitor* visitor);
 
  private:
   VoidType() {}
 
   DISALLOW_COPY_AND_ASSIGN(VoidType);
 };
 
 
+class BottomType : public DartType {
+ public:
+  static BottomType* ReadFrom(Reader* reader);
+
+  virtual ~BottomType();
+
+  DEFINE_CASTING_OPERATIONS(BottomType);
+
+  virtual void AcceptDartTypeVisitor(DartTypeVisitor* visitor);
+  virtual void VisitChildren(Visitor* visitor);
+
+ private:
+  BottomType() {}
+
+  DISALLOW_COPY_AND_ASSIGN(BottomType);
+};
+
+
 class InterfaceType : public DartType {
  public:
   static InterfaceType* ReadFrom(Reader* reader);
   static InterfaceType* ReadFrom(Reader* reader, bool _without_type_arguments_);
 
   explicit InterfaceType(intptr_t class_reference)
       : class_reference_(class_reference) {}
   virtual ~InterfaceType();
 
   DEFINE_CASTING_OPERATIONS(InterfaceType);
@@ skipping 432 matching lines @@
   virtual ~DartTypeVisitor() {}
 
   virtual void VisitDefaultDartType(DartType* node) = 0;
   virtual void VisitInvalidType(InvalidType* node) {
     VisitDefaultDartType(node);
   }
   virtual void VisitDynamicType(DynamicType* node) {
     VisitDefaultDartType(node);
   }
   virtual void VisitVoidType(VoidType* node) { VisitDefaultDartType(node); }
+  virtual void VisitBottomType(BottomType* node) { VisitDefaultDartType(node); }
   virtual void VisitInterfaceType(InterfaceType* node) {
     VisitDefaultDartType(node);
   }
   virtual void VisitFunctionType(FunctionType* node) {
     VisitDefaultDartType(node);
   }
   virtual void VisitTypeParameterType(TypeParameterType* node) {
     VisitDefaultDartType(node);
   }
   virtual void VisitVectorType(VectorType* node) { VisitDefaultDartType(node); }
@@ skipping 143 matching lines @@
 }  // namespace kernel
 
 kernel::Program* ReadPrecompiledKernelFromBuffer(const uint8_t* buffer,
                                                  intptr_t buffer_length);
 
 
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)
 #endif  // RUNTIME_VM_KERNEL_H_