Provide a counter for thrown JavaScript errors per context

src/contexts.h

 // Copyright 2012 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_CONTEXTS_H_
 #define V8_CONTEXTS_H_
 
 #include "src/heap/heap.h"
 #include "src/objects.h"
 
@@ skipping 168 matching lines @@
     bound_function_with_constructor_map)                                       \
   V(BOUND_FUNCTION_WITHOUT_CONSTRUCTOR_MAP_INDEX, Map,                         \
     bound_function_without_constructor_map)                                    \
   V(CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, JSFunction,                            \
     call_as_constructor_delegate)                                              \
   V(CALL_AS_FUNCTION_DELEGATE_INDEX, JSFunction, call_as_function_delegate)    \
   V(CONTEXT_EXTENSION_FUNCTION_INDEX, JSFunction, context_extension_function)  \
   V(DATA_VIEW_FUN_INDEX, JSFunction, data_view_fun)                            \
   V(ERROR_MESSAGE_FOR_CODE_GEN_FROM_STRINGS_INDEX, Object,                     \
     error_message_for_code_gen_from_strings)                                   \
+  V(ERRORS_THROWN_INDEX, Object, errors_thrown)                         \

[Yang, 2015/11/02 05:48:57]

Can we make the type Smi?

[Michael Hablich, 2015/11/04 10:58:07]

Done.

   V(EXTRAS_EXPORTS_OBJECT_INDEX, JSObject, extras_binding_object)              \
   V(EXTRAS_UTILS_OBJECT_INDEX, JSObject, extras_utils_object)                  \
   V(FAST_ALIASED_ARGUMENTS_MAP_INDEX, Map, fast_aliased_arguments_map)         \
   V(FLOAT32_ARRAY_FUN_INDEX, JSFunction, float32_array_fun)                    \
   V(FLOAT32X4_FUNCTION_INDEX, JSFunction, float32x4_function)                  \
   V(FLOAT64_ARRAY_FUN_INDEX, JSFunction, float64_array_fun)                    \
   V(FUNCTION_CACHE_INDEX, ObjectHashTable, function_cache)                     \
   V(GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX, Map, generator_object_prototype_map) \
   V(INITIAL_ARRAY_PROTOTYPE_INDEX, JSObject, initial_array_prototype)          \
   V(INITIAL_OBJECT_PROTOTYPE_INDEX, JSObject, initial_object_prototype)        \
@@ skipping 190 matching lines @@
 
     // Total number of slots.
     NATIVE_CONTEXT_SLOTS,
     FIRST_WEAK_SLOT = OPTIMIZED_FUNCTIONS_LIST,
 
     MIN_CONTEXT_SLOTS = GLOBAL_PROXY_INDEX,
     // This slot holds the thrown value in catch contexts.
     THROWN_OBJECT_INDEX = MIN_CONTEXT_SLOTS,
   };
 
+  void IncrementErrorsThrown();
+  int GetErrorsThrown();
+
   // Direct slot access.
   inline JSFunction* closure();
   inline void set_closure(JSFunction* closure);
 
   inline Context* previous();
   inline void set_previous(Context* context);
 
   inline bool has_extension();
   inline Object* extension();
   inline void set_extension(Object* object);
@@ skipping 144 matching lines @@
 #endif
 
   STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize);
   STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CONTEXTS_H_