Runtime support for evaluation of static field initializer expressions

runtime/vm/intermediate_language.cc

 // Copyright (c) 2013, 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/bigint_operations.h"
 #include "vm/bit_vector.h"
 #include "vm/cpu.h"
 #include "vm/dart_entry.h"
@@ skipping 308 matching lines @@
   ASSERT(other_load != NULL);
   if (field() != NULL) {
     return (other_load->field() != NULL) &&
         (field()->raw() == other_load->field()->raw());
   }
   return (other_load->field() == NULL) &&
       (offset_in_bytes() == other_load->offset_in_bytes());
 }
 
 
+Instruction* InitStaticFieldInstr::Canonicalize(FlowGraph* flow_graph) {
+  const bool is_initialized =
+      (field_.value() != Object::sentinel().raw()) &&
+      (field_.value() != Object::transition_sentinel().raw());
+  return is_initialized ? NULL : this;
+}
+
+
 EffectSet LoadStaticFieldInstr::Dependencies() const {
   return StaticField().is_final() ? EffectSet::None() : EffectSet::All();
 }
 
 
 bool LoadStaticFieldInstr::AttributesEqual(Instruction* other) const {
   LoadStaticFieldInstr* other_load = other->AsLoadStaticField();
   ASSERT(other_load != NULL);
   // Assert that the field is initialized.
   ASSERT(StaticField().value() != Object::sentinel().raw());
@@ skipping 2623 matching lines @@
     case Token::kTRUNCDIV: return 0;
     case Token::kMOD: return 1;
     default: UNIMPLEMENTED(); return -1;
   }
 }
 
 
 #undef __
 
 }  // namespace dart