[wasm] [asmjs] Route asm.js warnings to the dev console.

include/v8.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.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 5692 matching lines @@
 
 // --- Exceptions ---
 
 
 typedef void (*FatalErrorCallback)(const char* location, const char* message);
 
 typedef void (*OOMErrorCallback)(const char* location, bool is_heap_oom);
 
 typedef void (*MessageCallback)(Local<Message> message, Local<Value> error);
 
+// --- Warnings ---
+
+typedef void (*AsmJsWarningCallback)(Local<Message> message);
+
 // --- Tracing ---
 
 typedef void (*LogEventCallback)(const char* name, int event);
 
 /**
  * Create new error objects by calling the corresponding error object
  * constructor with the message.
  */
 class V8_EXPORT Exception {
  public:
@@ skipping 1337 matching lines @@
    * https://code.google.com/p/v8/issues/detail?id=3598
    */
   void GetCodeRange(void** start, size_t* length_in_bytes);
 
   /** Set the callback to invoke in case of fatal errors. */
   void SetFatalErrorHandler(FatalErrorCallback that);
 
   /** Set the callback to invoke in case of OOM errors. */
   void SetOOMErrorHandler(OOMErrorCallback that);
 
+  /** Set the callback to invoke in case of AsmJS validation errors. */
+  void SetAsmJsWarningHandler(AsmJsWarningCallback that);

[dgozman, 2016/11/29 19:00:53]

Do we really need this to be asm-js specific? What about SetWarninghandler, or
even (similar to message handler) {Add,Remove}WarningHandler?

+
   /**
    * Set the callback to invoke to check if code generation from
    * strings should be allowed.
    */
   void SetAllowCodeGenerationFromStringsCallback(
       AllowCodeGenerationFromStringsCallback callback);
 
   /**
   * Check if V8 is dead and therefore unusable.  This is the case after
   * fatal errors such as out-of-memory situations.
@@ skipping 2595 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // INCLUDE_V8_H_