Resubmit change 6302 after fixing the compiler warning on older GCC compiler versions:

vm/raw_object.cc

 // 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.
 
 #include "vm/raw_object.h"
 
 #include "vm/freelist.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/visitor.h"
@@ skipping 210 matching lines @@
       UNREACHABLE();
       break;
   }
 
   ASSERT(size != 0);
   ASSERT(size == Size());
   return size;
 }
 
 
+bool RawObject::FindObject(FindObjectVisitor* visitor) {
+  ASSERT(visitor != NULL);
+  return visitor->FindObject(const_cast<RawObject*>(this));
+}
+
+
 intptr_t RawClass::VisitClassPointers(RawClass* raw_obj,
                                       ObjectPointerVisitor* visitor) {
   visitor->VisitPointers(raw_obj->from(), raw_obj->to());
   return Class::InstanceSize();
 }
 
 
 intptr_t RawUnresolvedClass::VisitUnresolvedClassPointers(
     RawUnresolvedClass* raw_obj, ObjectPointerVisitor* visitor) {
   visitor->VisitPointers(raw_obj->from(), raw_obj->to());
@@ skipping 121 matching lines @@
 
 
 intptr_t RawInstructions::VisitInstructionsPointers(
     RawInstructions* raw_obj, ObjectPointerVisitor* visitor) {
   RawInstructions* obj = raw_obj->ptr();
   visitor->VisitPointer(reinterpret_cast<RawObject**>(&obj->code_));
   return Instructions::InstanceSize(obj->size_);
 }
 
 
+bool RawInstructions::ContainsPC(RawObject* raw_obj, uword pc) {
+  RawClass* raw_class = raw_obj->ptr()->class_;
+  ObjectKind instance_kind = raw_class->ptr()->instance_kind_;
+  if (instance_kind == kInstructions) {
+    RawInstructions* raw_instr = reinterpret_cast<RawInstructions*>(raw_obj);
+    uword start_pc =
+        reinterpret_cast<uword>(raw_instr->ptr()) + Instructions::HeaderSize();
+    uword end_pc = start_pc + raw_instr->ptr()->size_;
+    ASSERT(end_pc > start_pc);
+    if ((pc >= start_pc) && (pc < end_pc)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+
 intptr_t RawPcDescriptors::VisitPcDescriptorsPointers(
     RawPcDescriptors* raw_obj, ObjectPointerVisitor* visitor) {
   RawPcDescriptors* obj = raw_obj->ptr();
   intptr_t length = Smi::Value(obj->length_);
   visitor->VisitPointer(reinterpret_cast<RawObject**>(&obj->length_));
   return PcDescriptors::InstanceSize(length);
 }
 
 
 intptr_t RawStackmap::VisitStackmapPointers(RawStackmap* raw_obj,
@@ skipping 288 matching lines @@
 intptr_t RawJSRegExp::VisitJSRegExpPointers(RawJSRegExp* raw_obj,
                                             ObjectPointerVisitor* visitor) {
   // Make sure that we got here with the tagged pointer as this.
   ASSERT(raw_obj->IsHeapObject());
   intptr_t length = Smi::Value(raw_obj->ptr()->data_length_);
   visitor->VisitPointers(raw_obj->from(), raw_obj->to());
   return JSRegExp::InstanceSize(length);
 }
 
 }  // namespace dart