Deoptimization can occur at Dart calls (includes native calls to C) but not at runtime calls. This …

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/dart_entry.h"
 #include "vm/flow_graph_allocator.h"
 #include "vm/flow_graph_builder.h"
@@ skipping 1309 matching lines @@
 void ClosureCallComp::EmitNativeCode(FlowGraphCompiler* compiler) {
   // The arguments to the stub include the closure.  The arguments
   // descriptor describes the closure's arguments (and so does not include
   // the closure).
   Register temp_reg = locs()->temp(0).reg();
   int argument_count = ArgumentCount();
   const Array& arguments_descriptor =
       DartEntry::ArgumentsDescriptor(argument_count - 1,
                                          argument_names());
   __ LoadObject(temp_reg, arguments_descriptor);
-
-  compiler->GenerateCall(token_pos(),
-                         &StubCode::CallClosureFunctionLabel(),
-                         PcDescriptors::kOther,
-                         locs());
+  compiler->GenerateDartCall(deopt_id(),
+                             token_pos(),
+                             &StubCode::CallClosureFunctionLabel(),
+                             PcDescriptors::kOther,
+                             locs());
   __ Drop(argument_count);
 }
 
 
 LocationSummary* InstanceCallComp::MakeLocationSummary() const {
   return MakeCallSummary();
 }
 
 
 void InstanceCallComp::EmitNativeCode(FlowGraphCompiler* compiler) {
-  compiler->AddCurrentDescriptor(PcDescriptors::kDeopt,
+  compiler->AddCurrentDescriptor(PcDescriptors::kDeoptBefore,
                                  deopt_id(),
                                  token_pos());
   compiler->GenerateInstanceCall(deopt_id(),
                                  token_pos(),
                                  function_name(),
                                  ArgumentCount(),
                                  argument_names(),
                                  checked_argument_count(),
                                  locs());
 }
@@ skipping 176 matching lines @@
       use->AddToEnvUseList();
     }
   }
   instr->set_env(copy);
 }
 
 
 #undef __
 
 }  // namespace dart