Additional asserts to debug issue #26927.

runtime/vm/code_generator.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/code_generator.h"
 
 #include "vm/assembler.h"
 #include "vm/ast.h"
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
@@ skipping 1846 matching lines @@
         }
         // Reduce the chance of triggering optimization while the function is
         // being optimized in the background. INT_MIN should ensure that it
         // takes long time to trigger optimization.
         // Note that the background compilation queue rejects duplicate entries.
         function.set_usage_counter(INT_MIN);
         BackgroundCompiler::EnsureInit(thread);
         ASSERT(isolate->background_compiler() != NULL);
         isolate->background_compiler()->CompileOptimized(function);
         // Continue in the same code.
-        arguments.SetReturn(Code::Handle(zone, function.CurrentCode()));
+        const Code& code = Code::Handle(zone, function.CurrentCode());
+        ASSERT(!code.IsDisabled());
+        arguments.SetReturn(code);
         return;
       }
     }
 
     // Reset usage counter for reoptimization before calling optimizer to
     // prevent recursive triggering of function optimization.
     function.set_usage_counter(0);
     if (FLAG_trace_compiler || FLAG_trace_optimizing_compiler) {
       if (function.HasOptimizedCode()) {
         THR_Print("ReCompiling function: '%s' \n",
                   function.ToFullyQualifiedCString());
       }
     }
     const Error& error = Error::Handle(
         zone, Compiler::CompileOptimizedFunction(thread, function));
     if (!error.IsNull()) {
       Exceptions::PropagateError(error);
     }
     const Code& optimized_code = Code::Handle(zone, function.CurrentCode());
     ASSERT(!optimized_code.IsNull());
   }
-  arguments.SetReturn(Code::Handle(zone, function.CurrentCode()));
+  const Code& code = Code::Handle(zone, function.CurrentCode());
+  ASSERT(!code.IsDisabled());
+  arguments.SetReturn(code);
 #else
   UNREACHABLE();
 #endif  // !DART_PRECOMPILED_RUNTIME
 }
 
 
 // The caller must be a static call in a Dart frame, or an entry frame.
 // Patch static call to point to valid code's entry point.
 DEFINE_RUNTIME_ENTRY(FixCallersTarget, 0) {
   StackFrameIterator iterator(StackFrameIterator::kDontValidateFrames);
@@ skipping 28 matching lines @@
                                  caller_code,
                                  current_target_code);
   caller_code.SetStaticCallTargetCodeAt(frame->pc(), current_target_code);
   if (FLAG_trace_patching) {
     OS::PrintErr("FixCallersTarget: caller %#" Px " "
                  "target '%s' -> %#" Px "\n",
                  frame->pc(),
                  target_function.ToFullyQualifiedCString(),
                  current_target_code.UncheckedEntryPoint());
   }
+  ASSERT(!current_target_code.IsDisabled());
   arguments.SetReturn(current_target_code);
 }
 
 
 // The caller tried to allocate an instance via an invalidated allocation
 // stub.
 DEFINE_RUNTIME_ENTRY(FixAllocationStubTarget, 0) {
 #if !defined(DART_PRECOMPILED_RUNTIME)
   StackFrameIterator iterator(StackFrameIterator::kDontValidateFrames);
   StackFrame* frame = iterator.NextFrame();
@@ skipping 396 matching lines @@
   const intptr_t elm_size = old_data.ElementSizeInBytes();
   const TypedData& new_data =
       TypedData::Handle(TypedData::New(cid, new_size, Heap::kOld));
   TypedData::Copy(new_data, 0, old_data, 0, old_size * elm_size);
   typed_data_cell.SetAt(0, new_data);
   arguments.SetReturn(new_data);
 }
 
 
 }  // namespace dart