[wasm] Support undefined indirect table entries, behind a flag.

src/messages.h

 // Copyright 2006-2008 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.
 
 // The infrastructure used for (localized) message reporting in V8.
 //
 // Note: there's a big unresolved issue about ownership of the data
 // structures used by this framework.
 
 #ifndef V8_MESSAGES_H_
@@ skipping 465 matching lines @@
   /* URIError */                                                               \
   T(URIMalformed, "URI malformed")                                             \
   /* Wasm errors (currently Error) */                                          \
   T(WasmTrapUnreachable, "unreachable")                                        \
   T(WasmTrapMemOutOfBounds, "memory access out of bounds")                     \
   T(WasmTrapDivByZero, "divide by zero")                                       \
   T(WasmTrapDivUnrepresentable, "divide result unrepresentable")               \
   T(WasmTrapRemByZero, "remainder by zero")                                    \
   T(WasmTrapFloatUnrepresentable, "integer result unrepresentable")            \
   T(WasmTrapFuncInvalid, "invalid function")                                   \
-  T(WasmTrapFuncSigMismatch, "function signature mismatch")
+  T(WasmTrapFuncSigMismatch, "function signature mismatch")                    \
+  T(WasmTrapDefaultFuncCall, "default function call")

[bradn, 2016/06/14 02:02:46]

I don't think we want to pay for a separate check.

 
 class MessageTemplate {
  public:
   enum Template {
 #define TEMPLATE(NAME, STRING) k##NAME,
     MESSAGE_TEMPLATES(TEMPLATE)
 #undef TEMPLATE
         kLastMessage
   };
 
@@ skipping 28 matching lines @@
   static Handle<String> GetMessage(Isolate* isolate, Handle<Object> data);
   static base::SmartArrayPointer<char> GetLocalizedMessage(Isolate* isolate,
                                                            Handle<Object> data);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_MESSAGES_H_