Add asserts and state tracking to ensure that we do not call

src/deoptimizer.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 40 matching lines @@
   if (eager_deoptimization_entry_code_ != NULL) {
     eager_deoptimization_entry_code_->Free(EXECUTABLE);
     eager_deoptimization_entry_code_ = NULL;
   }
   if (lazy_deoptimization_entry_code_ != NULL) {
     lazy_deoptimization_entry_code_->Free(EXECUTABLE);
     lazy_deoptimization_entry_code_ = NULL;
   }
 }
 
+
+// We rely on this function not causing a GC.  It is called from generated code
+// without having a real stack frame in place.
 Deoptimizer* Deoptimizer::New(JSFunction* function,
                               BailoutType type,
                               unsigned bailout_id,
                               Address from,
                               int fp_to_sp_delta,
                               Isolate* isolate) {
   ASSERT(isolate == Isolate::Current());
   Deoptimizer* deoptimizer = new Deoptimizer(isolate,
                                              function,
                                              type,
@@ skipping 273 matching lines @@
   DeoptimizingCodeListNode* node =
       isolate->deoptimizer_data()->deoptimizing_code_list_;
   while (node != NULL) {
     length++;
     node = node->next();
   }
   return length;
 }
 
 
+// We rely on this function not causing a GC.  It is called from generated code
+// without having a real stack frame in place.
 void Deoptimizer::DoComputeOutputFrames() {
   if (bailout_type_ == OSR) {
     DoComputeOsrOutputFrame();
     return;
   }
 
   // Print some helpful diagnostic information.
   int64_t start = OS::Ticks();
   if (FLAG_trace_deopt) {
     PrintF("[deoptimizing%s: begin 0x%08" V8PRIxPTR " ",
@@ skipping 883 matching lines @@
       }
       frames_to_skip--;
     }
   }
 
   UNREACHABLE();
 }
 
 
 } }  // namespace v8::internal