Specify descriptor kind to iterate on.

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 <limits>
 #include "include/dart_api.h"
 #include "platform/assert.h"
@@ skipping 3016 matching lines @@
 
   static void PrintHeaderString();
 
   void PrintToJSONObject(JSONObject* jsobj) const;
 
   // We would have a VisitPointers function here to traverse the
   // pc descriptors table to visit objects if any in the table.
 
   class Iterator : ValueObject {
    public:
-    explicit Iterator(const PcDescriptors& descriptors)
-        : descriptors_(descriptors), current_ix_(0) {}
+    Iterator(const PcDescriptors& descriptors, intptr_t kind_mask)
+        : descriptors_(descriptors), kind_mask_(kind_mask), current_ix_(0) {
+      MoveToMatching();
+    }
+
+    bool HasNext() const { return current_ix_ < descriptors_.Length(); }
+
+    const RawPcDescriptors::PcDescriptorRec& Next() {
+      ASSERT(HasNext());
+      const RawPcDescriptors::PcDescriptorRec* res =
+         descriptors_.recAt(current_ix_++);
+      MoveToMatching();
+      return *res;
+    }
+
+   private:
+    friend class PcDescriptors;
 
     // For nested iterations, starting at element after.
     explicit Iterator(const Iterator& iter)
         : ValueObject(),
           descriptors_(iter.descriptors_),
+          kind_mask_(iter.kind_mask_),
           current_ix_(iter.current_ix_) {}
 
-    bool HasNext() { return current_ix_ < descriptors_.Length(); }
-
-    const RawPcDescriptors::PcDescriptorRec& Next() {
-      ASSERT(HasNext());
-      return *descriptors_.recAt(current_ix_++);
+    // Moves to record that matches kind_mask_.
+    void MoveToMatching() {
+      while (current_ix_ < descriptors_.Length()) {
+        const RawPcDescriptors::PcDescriptorRec& rec =
+            *descriptors_.recAt(current_ix_);
+        if ((rec.kind_ & kind_mask_) != 0) {
+          return;  // Current is valid.
+        } else {
+          ++current_ix_;
+        }
+      }
     }
 
-   private:
     const PcDescriptors& descriptors_;
+    const intptr_t kind_mask_;
     intptr_t current_ix_;
   };
 
  private:
   static const char* KindAsStr(RawPcDescriptors::Kind kind);
 
   intptr_t Length() const;
 
   RawPcDescriptors::PcDescriptorRec* recAt(intptr_t ix) const {
     ASSERT(ix < Length());
@@ skipping 4083 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_