[wasm] Initial signal handler

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 3d8082ee1415f7a5ff41f4b059cce528bf22c381..c9ad5db4392afe7f0fa3aae90760946abe30563f 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -7578,6 +7578,17 @@ class V8_EXPORT V8 {
    */
   static void ShutdownPlatform();
 
+  /**
+   * Given the V8 signal handler a chance to handle a fault.
+   */
+  static bool MaybeHandleFault(int signum, void* info, void* context);

[jochen (gone - plz use gerrit), 2017/01/02 07:36:28]

also, what is signum, info, and context supposed to be? Please add comments
explaining what the embedder is supposed to pass here.

Please make sure that the embedder can pass this information an OS/arch
combinations we support.

[Eric Holk, 2017/01/10 23:10:48]

This version here is overly specific to Posix systems. I will rewrite it to have
the specific bits of information we need, which are available on the platforms
we support. Ideally we would pass all of the platform-specific information as
well. Would passing in a void* that points to platform specific context
information be okay, with documentation saying what should be there on each
system?

+
+  /**
+   * Enable the default signal handler rather than using one provided by the
+   * embedder.
+   */
+  static bool RegisterDefaultSignalHandler();
+
  private:
   V8();