First step toward an optimizing compiler:

runtime/vm/intermediate_language.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/intermediate_language.h"
 
 #include "vm/bit_vector.h"
 #include "vm/flow_graph_builder.h"
 #include "vm/object.h"
 #include "vm/os.h"
@@ skipping 27 matching lines @@
 void FlowGraphVisitor::VisitBlocks() {
   for (intptr_t i = 0; i < block_order_.length(); ++i) {
     Instruction* current = block_order_[i]->Accept(this);
     while ((current != NULL) && !current->IsBlockEntry()) {
       current = current->Accept(this);
     }
   }
 }
 
 
+UseVal::UseVal(BindInstr* definition) : definition_(definition) {
+  definition->SetUse(this);
+}
+
+
 // ==== Per-instruction input counts.
 intptr_t AssertAssignableComp::InputCount() const {
   // Value and optional instantiator and instantiator type arguments.
   intptr_t count = 1;
   if (instantiator() != NULL) count++;
   if (instantiator_type_arguments() != NULL) count++;
   return count;
 }
 
 
@@ skipping 488 matching lines @@
   return AbstractType::null();
 }
 
 
 RawAbstractType* CatchEntryComp::StaticType() const {
   UNREACHABLE();
   return AbstractType::null();
 }
 
 
+RawAbstractType* BinaryOpComp::StaticType() const {
+  // TODO(srdjan): Compute based on input types (ICData).
+  return Type::DynamicType();
+}
+
+
 }  // namespace dart