Mark await expressions as caught or uncaught

src/objects.h

 // Copyright 2015 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.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
@@ skipping 4579 matching lines @@
   // exception or cause a re-throw to outside the code boundary. Since this is
   // undecidable it is merely an approximation (e.g. useful for debugger).
   enum CatchPrediction {
     UNCAUGHT,    // The handler will (likely) rethrow the exception.
     CAUGHT,      // The exception will be caught by the handler.
     PROMISE,     // The exception will be caught and cause a promise rejection.
     DESUGARING,  // The exception will be caught, but both the exception and the
                  // catching are part of a desugaring and should therefore not
                  // be visible to the user (we won't notify the debugger of such
                  // exceptions).
+    ASYNC_AWAIT,  // The exception will be caught and cause a promise rejection
+                  // in the desugaring of an async function, so special
+                  // async/await handling in the debugger can take place.
   };
 
   // Getters for handler table based on ranges.
   inline int GetRangeStart(int index) const;
   inline int GetRangeEnd(int index) const;
   inline int GetRangeHandler(int index) const;
   inline int GetRangeData(int index) const;
 
   // Setters for handler table based on ranges.
   inline void SetRangeStart(int index, int value);
@@ skipping 32 matching lines @@
   static const int kRangeHandlerIndex = 2;
   static const int kRangeDataIndex = 3;
   static const int kRangeEntrySize = 4;
 
   // Layout description for handler table based on return addresses.
   static const int kReturnOffsetIndex = 0;
   static const int kReturnHandlerIndex = 1;
   static const int kReturnEntrySize = 2;
 
   // Encoding of the {handler} field.
-  class HandlerPredictionField : public BitField<CatchPrediction, 0, 2> {};
-  class HandlerOffsetField : public BitField<int, 2, 30> {};
+  class HandlerPredictionField : public BitField<CatchPrediction, 0, 3> {};
+  class HandlerOffsetField : public BitField<int, 3, 29> {};
 };
 
 // ByteArray represents fixed sized byte arrays.  Used for the relocation info
 // that is attached to code objects.
 class ByteArray: public FixedArrayBase {
  public:
   inline int Size();
 
   // Setter and getter.
   inline byte get(int index);
@@ skipping 6562 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_