Prevent excessive deoptimization when optimistically assuming Smi in typed data stores.

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 6735 matching lines @@
 
 void Function::set_ic_data_array(const Array& value) const {
   StorePointer(&raw_ptr()->ic_data_array_, value.raw());
 }
 
 
 RawArray* Function::ic_data_array() const {
   return raw_ptr()->ic_data_array_;
 }
 
-void Function::ClearICData() const {
+void Function::ClearICDataArray() const {
   set_ic_data_array(Array::Handle());
 }
 
 
+void Function::SetDeoptReasonForAll(intptr_t deopt_id,
+                                    ICData::DeoptReasonId reason) {
+  const Array& icd_array = Array::Handle(ic_data_array());
+  ICData& icd = ICData::Handle();
+  for (intptr_t i = 0; i < icd_array.Length(); i++) {
+    icd ^= icd_array.At(i);
+    if (icd.deopt_id() == deopt_id) {
+      icd.AddDeoptReason(reason);
+    }
+  }
+}
+
+
 bool Function::CheckSourceFingerprint(const char* prefix, int32_t fp) const {
   if (SourceFingerprint() != fp) {
     const bool recalculatingFingerprints = false;
     if (recalculatingFingerprints) {
       // This output can be copied into a file, then used with sed
       // to replace the old values.
       // sed -i .bak -f /tmp/newkeys runtime/vm/method_recognizer.h
       // sed -i .bak -f /tmp/newkeys runtime/vm/flow_graph_builder.h
       OS::Print("s/V(%s, %d)/V(%s, %d)/\n",
                 prefix, fp, prefix, SourceFingerprint());
@@ skipping 14036 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart