Deoptimize non-smi switch cases if they are reached.

src/runtime.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 6858 matching lines @@
       function->PrintName();
       PrintF("]\n");
     }
 
     // Try to compile the optimized code.  A true return value from
     // CompileOptimized means that compilation succeeded, not necessarily
     // that optimization succeeded.
     if (CompileOptimized(function, ast_id) && function->IsOptimized()) {
       DeoptimizationInputData* data = DeoptimizationInputData::cast(
           function->code()->deoptimization_data());
-      if (FLAG_trace_osr) {
-        PrintF("[on-stack replacement offset %d in optimized code]\n",
+      if (data->OsrPcOffset()->value() >= 0) {
+        if (FLAG_trace_osr) {
+          PrintF("[on-stack replacement offset %d in optimized code]\n",
                data->OsrPcOffset()->value());
+        }
+        ASSERT(data->OsrAstId()->value() == ast_id);
+      } else {
+        // We may never generate the desired OSR entry if we emit an
+        // early deoptimize.
+        succeeded = false;
       }
-      ASSERT(data->OsrAstId()->value() == ast_id);
-      ASSERT(data->OsrPcOffset()->value() >= 0);
     } else {
       succeeded = false;
     }
   }
 
   // Revert to the original stack checks in the original unoptimized code.
   if (FLAG_trace_osr) {
     PrintF("[restoring original stack checks in ");
     function->PrintName();
     PrintF("]\n");
@@ skipping 3894 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     Counters::gc_last_resort_from_js.Increment();
     Heap::CollectAllGarbage(false);
   }
 }
 
 
 } }  // namespace v8::internal