Check for initialized code stub descriptor in the deoptimizer.

src/deoptimizer.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/disasm.h"
@@ skipping 1606 matching lines @@
   //                                         reg = number of parameters
   //                                         reg = failure handler address
   //                                         reg = saved frame
   //                                         reg = JSFunction context
   //
 
   CHECK(compiled_code_->is_hydrogen_stub());
   int major_key = CodeStub::GetMajorKey(compiled_code_);
   CodeStubInterfaceDescriptor* descriptor =
       isolate_->code_stub_interface_descriptor(major_key);
+  // Check that there is a matching descriptor to the major key.
+  // This will fail if there has not been one installed to the isolate.
+  DCHECK_EQ(descriptor->MajorKey(), major_key);
 
   // The output frame must have room for all pushed register parameters
   // and the standard stack frame slots.  Include space for an argument
   // object to the callee and optionally the space to pass the argument
   // object to the stub failure handler.
   int param_count = descriptor->GetEnvironmentParameterCount();
   CHECK_GE(param_count, 0);
 
   int height_in_bytes = kPointerSize * param_count + sizeof(Arguments) +
       kPointerSize;
@@ skipping 2033 matching lines @@
 }
 
 
 void DeoptimizedFrameInfo::Iterate(ObjectVisitor* v) {
   v->VisitPointer(BitCast<Object**>(&function_));
   v->VisitPointers(parameters_, parameters_ + parameters_count_);
   v->VisitPointers(expression_stack_, expression_stack_ + expression_count_);
 }
 
 } }  // namespace v8::internal