Introduce a SignatureData class so that signature functions can store both their

runtime/vm/raw_object.h

 // Copyright (c) 2012, 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_RAW_OBJECT_H_
 #define RUNTIME_VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/atomic.h"
 #include "vm/globals.h"
 #include "vm/snapshot.h"
 #include "vm/token.h"
 #include "vm/token_position.h"
 
 namespace dart {
 
 // Macrobatics to define the Object hierarchy of VM implementation classes.
 #define CLASS_LIST_NO_OBJECT_NOR_STRING_NOR_ARRAY(V)                           \
   V(Class)                                                                     \
   V(UnresolvedClass)                                                           \
   V(TypeArguments)                                                             \
   V(PatchClass)                                                                \
   V(Function)                                                                  \
   V(ClosureData)                                                               \
+  V(SignatureData)                                                             \
   V(RedirectionData)                                                           \
   V(Field)                                                                     \
   V(LiteralToken)                                                              \
   V(TokenStream)                                                               \
   V(Script)                                                                    \
   V(Library)                                                                   \
   V(Namespace)                                                                 \
   V(Code)                                                                      \
   V(Instructions)                                                              \
   V(ObjectPool)                                                                \
@@ skipping 825 matching lines @@
   RawContextScope* context_scope_;
   RawFunction* parent_function_;  // Enclosing function of this local function.
   RawType* signature_type_;
   RawInstance* closure_;  // Closure object for static implicit closures.
   RawObject** to() { return reinterpret_cast<RawObject**>(&ptr()->closure_); }
 
   friend class Function;
 };
 
 
+class RawSignatureData : public RawObject {
+ private:
+  RAW_HEAP_OBJECT_IMPLEMENTATION(SignatureData);
+
+  RawObject** from() {
+    return reinterpret_cast<RawObject**>(&ptr()->parent_function_);
+  }
+  RawFunction* parent_function_;  // Enclosing function of this sig. function.
+  RawType* signature_type_;
+  RawObject** to() {
+    return reinterpret_cast<RawObject**>(&ptr()->signature_type_);
+  }
+
+  friend class Function;
+};
+
+
 class RawRedirectionData : public RawObject {
  private:
   RAW_HEAP_OBJECT_IMPLEMENTATION(RedirectionData);
 
   RawObject** from() { return reinterpret_cast<RawObject**>(&ptr()->type_); }
   RawType* type_;
   RawString* identifier_;
   RawFunction* target_;
   RawObject** to() { return reinterpret_cast<RawObject**>(&ptr()->target_); }
 };
@@ skipping 1520 matching lines @@
   COMPILE_ASSERT(kExternalTypedDataInt8ArrayCid ==
                  kTypedDataInt8ArrayViewCid + 15);
   COMPILE_ASSERT(kByteBufferCid == kExternalTypedDataInt8ArrayCid + 14);
   COMPILE_ASSERT(kNullCid == kByteBufferCid + 1);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_RAW_OBJECT_H_