[wasm] Provide better stack traces for asm.js code

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index e8329883f7e6eaf44f04ebbccc137e5f106404e1..a4694d5d9367a3487ad6c5576203c16476f4a723 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -520,9 +520,14 @@ Handle<Object> Isolate::CaptureSimpleStackTrace(Handle<JSReceiver> error_object,
         DCHECK(wasm::IsWasmObject(*wasm_object) ||
                wasm_object->IsUndefined(this));
 
-        elements = FrameArray::AppendWasmFrame(
-            elements, wasm_object, wasm_function_index, abstract_code, offset,
-            FrameArray::kIsWasmFrame);
+        int flags = FrameArray::kIsWasmFrame;
+        if (wasm::WasmIsAsmJs(*wasm_object, this)) {
+          flags |= FrameArray::kIsAsmWasmFrame;

[jgruber, 2016/10/11 19:07:40]

Would it make sense to mark a frame as either kIsWasmFrame or kIsAsmWasmFrame?
If possible, I think I'd prefer going down that route.

[Clemens Hammacher, 2016/10/12 07:37:18]

Done.

+        }
+
+        elements = FrameArray::AppendWasmFrame(elements, wasm_object,
+                                               wasm_function_index,
+                                               abstract_code, offset, flags);
       } break;
 
       default: