Simple array bounds check elimination on top of range analysis framework.

runtime/vm/il_printer.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/il_printer.h"
 
 #include "vm/intermediate_language.h"
 #include "vm/os.h"
 #include "vm/parser.h"
 
@@ skipping 233 matching lines @@
         f->Print("%"Pd, value_);
       }
       break;
     case kUnknown:
       f->Print("_|_");
       break;
   }
 }
 
 
+const char* RangeBoundary::ToCString() const {
+  char buffer[256];
+  BufferFormatter f(buffer, sizeof(buffer));
+  PrintTo(&f);
+  return Isolate::Current()->current_zone()->MakeCopyOfString(buffer);
+}
+
+
 void AssertAssignableInstr::PrintOperandsTo(BufferFormatter* f) const {
   value()->PrintTo(f);
   f->Print(", %s, '%s'%s",
            String::Handle(dst_type().Name()).ToCString(),
            dst_name().ToCString(),
            is_eliminated() ? " eliminated" : "");
   f->Print(" instantiator(");
   instantiator()->PrintTo(f);
   f->Print(")");
   f->Print(" instantiator_type_arguments(");
@@ skipping 389 matching lines @@
       f->Print(" [");
       locations_[i].PrintTo(f);
       f->Print("]");
     }
   }
   f->Print(" }");
   if (outer_ != NULL) outer_->PrintTo(f);
 }
 
 }  // namespace dart