Lazily generate local var descriptors.

runtime/vm/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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 12029 matching lines @@
 void Code::Comments::SetCommentAt(intptr_t idx, const String& comment) {
   comments_.SetAt(idx * kNumberOfEntries + kCommentEntry, comment);
 }
 
 
 Code::Comments::Comments(const Array& comments)
     : comments_(comments) {
 }
 
 
+RawLocalVarDescriptors* Code::GetLocalVarDescriptors() const {
+  LocalVarDescriptors& v = LocalVarDescriptors::Handle(var_descriptors());
+  if (v.IsNull()) {
+    const Function& f = Function::Handle(function());
+    ASSERT(!f.IsIrregexpFunction());  // Not yet implemented.
+    Compiler::ComputeLocalVarDescriptors(*this);
+  }
+  return v.raw();
+}
+
+
 void Code::set_state_bits(intptr_t bits) const {
   StoreNonPointer(&raw_ptr()->state_bits_, bits);
 }
 
 
 void Code::set_is_optimized(bool value) const {
   set_state_bits(OptimizedBit::update(value, raw_ptr()->state_bits_));
 }
 
 
@@ skipping 8655 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart