[wasm] Throw real Error on wasm trap

src/runtime/runtime-internal.cc

 // Copyright 2014 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.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/ast/prettyprinter.h"
 #include "src/bootstrapper.h"
 #include "src/conversions.h"
@@ skipping 78 matching lines @@
   return isolate->ReThrow(args[0]);
 }
 
 
 RUNTIME_FUNCTION(Runtime_ThrowStackOverflow) {
   SealHandleScope shs(isolate);
   DCHECK_LE(0, args.length());
   return isolate->StackOverflow();
 }
 
+RUNTIME_FUNCTION(Runtime_ThrowWasmError) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(1, args.length());
+  CONVERT_SMI_ARG_CHECKED(message_id, 0);
+  // TODO(clemensh): discuss with titzer whether a WasmError class would make

[titzer, 2016/04/18 16:22:13]

When in doubt, leave it out :-)

+  // sense here
+  THROW_NEW_ERROR_RETURN_FAILURE(
+      isolate, NewError(static_cast<MessageTemplate::Template>(message_id)));
+}
 
 RUNTIME_FUNCTION(Runtime_UnwindAndFindExceptionHandler) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 0);
   return isolate->UnwindAndFindHandler();
 }
 
 
 RUNTIME_FUNCTION(Runtime_PromoteScheduledException) {
   SealHandleScope shs(isolate);
@@ skipping 375 matching lines @@
   std::stringstream stats_stream;
   isolate->counters()->runtime_call_stats()->Print(stats_stream);
   Handle<String> result =
       isolate->factory()->NewStringFromAsciiChecked(stats_stream.str().c_str());
   isolate->counters()->runtime_call_stats()->Reset();
   return *result;
 }
 
 }  // namespace internal
 }  // namespace v8