Add ability for Function to generate source

runtime/vm/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 VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 1425 matching lines @@
 };
 
 
 class Function : public Object {
  public:
   RawString* name() const { return raw_ptr()->name_; }
   RawString* UserVisibleName() const;
   RawString* QualifiedUserVisibleName() const;
   virtual RawString* DictionaryName() const { return name(); }
 
+  RawString* GenerateSource();
+
   // Build a string of the form 'C<T, R>(T, {b: B, c: C}) => R' representing the
   // internal signature of the given function. In this example, T and R are
   // type parameters of class C, the owner of the function.
   RawString* Signature() const {
     const bool instantiate = false;
     return BuildSignature(instantiate, kInternalName, TypeArguments::Handle());
   }
 
   // Build a string of the form '(T, {b: B, c: C}) => R' representing the
   // user visible signature of the given function. In this example, T and R are
@@ skipping 810 matching lines @@
 
 
 class TokenStream : public Object {
  public:
   RawArray* TokenObjects() const;
   void SetTokenObjects(const Array& value) const;
 
   RawExternalTypedData* GetStream() const;
   void SetStream(const ExternalTypedData& stream) const;
 
-  RawString* GenerateSource() const;
+  RawString* GenerateSource(intptr_t start_tok_pos = 0,
+                            intptr_t end_tok_pos = -1) const;
   intptr_t ComputeSourcePosition(intptr_t tok_pos) const;
 
   RawString* PrivateKey() const;
 
   static const intptr_t kBytesPerElement = 1;
   static const intptr_t kMaxElements = kSmiMax / kBytesPerElement;
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawTokenStream));
   }
@@ skipping 4094 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_