[wasm] Initial signal handler

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 4b6134d1781c4c25f8079afdbbb7939f079e5f86..85cb2b7a9bd05b1c03f0725d333f61ada352a3ca 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -7646,6 +7646,32 @@ class V8_EXPORT V8 {
    */
   static void ShutdownPlatform();
 
+  /**
+   * Given the V8 signal handler a chance to handle a fault.
+   *
+   * This function determines whether a memory access violation can be recovered
+   * by V8. If so, it will return true and set return_address to a location
+   * to jump to in order to recover from the fault. Otherwise, TryHandleFault
+   * will return true.
+   *
+   * \param source_instruction The address of the instruction that caused the
+   * fault.
+   *
+   * \param target_data The address that the faulting instruction was trying
+   * to read from or write to.
+   *
+   * \param return_address An output parameter where TryHandleFault will store
+   * the return address if V8 can recover from the fault.
+   */
+  static bool TryHandleFault(void* source_instruction, void* target_data,
+                             void** return_address);
+
+  /**
+   * Enable the default signal handler rather than using one provided by the
+   * embedder.
+   */
+  static bool RegisterDefaultSignalHandler();
+
  private:
   V8();