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

src/messages.h

 // Copyright 2006-2008 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.
 
 // The infrastructure used for (localized) message reporting in V8.
 //
 // Note: there's a big unresolved issue about ownership of the data
 // structures used by this framework.
 
 #ifndef V8_MESSAGES_H_
@@ skipping 130 matching lines @@
   int GetColumnNumber() override { return -1; }
 
   bool IsNative() override { return false; }
   bool IsToplevel() override { return false; }
   bool IsEval() override { return false; }
   bool IsConstructor() override { return false; }
   bool IsStrict() const override { return false; }
 
   MaybeHandle<String> ToString() override;
 
- private:
-  void FromFrameArray(Isolate* isolate, Handle<FrameArray> array, int frame_ix);
+ protected:
   Handle<Object> Null() const;
 
   Isolate* isolate_;
 
   Handle<Object> wasm_obj_;
   uint32_t wasm_func_index_;
   Handle<AbstractCode> code_;
   int offset_;
 
+ private:
+  void FromFrameArray(Isolate* isolate, Handle<FrameArray> array, int frame_ix);
+
   friend class FrameArrayIterator;
 };
 
+class AsmJsWasmStackFrame : public WasmStackFrame {
+ public:
+  virtual ~AsmJsWasmStackFrame() {}
+
+  Handle<Object> GetReceiver() const override;
+  Handle<Object> GetFunction() const override;
+
+  Handle<Object> GetFileName() override;
+  Handle<Object> GetFunctionName() override;
+  Handle<Object> GetScriptNameOrSourceUrl() override;
+
+  int GetPosition() const override;
+  int GetLineNumber() override;
+  int GetColumnNumber() override;
+
+  MaybeHandle<String> ToString() override;
+};
+
 class FrameArrayIterator {
  public:
   FrameArrayIterator(Isolate* isolate, Handle<FrameArray> array,
                      int frame_ix = 0);
 
   StackFrameBase* Frame();
 
   bool HasNext() const;
   void Next();
 
  private:
   Isolate* isolate_;
 
   Handle<FrameArray> array_;
   int next_frame_ix_;
 
   WasmStackFrame wasm_frame_;
+  AsmJsWasmStackFrame asm_wasm_frame_;
   JSStackFrame js_frame_;
 };
 
 // Determines how stack trace collection skips frames.
 enum FrameSkipMode {
   // Unconditionally skips the first frame. Used e.g. when the Error constructor
   // is called, in which case the first frame is always a BUILTIN_EXIT frame.
   SKIP_FIRST,
   // Skip all frames until a specified caller function is seen.
   SKIP_UNTIL_SEEN,
@@ skipping 489 matching lines @@
   static Handle<String> GetMessage(Isolate* isolate, Handle<Object> data);
   static std::unique_ptr<char[]> GetLocalizedMessage(Isolate* isolate,
                                                      Handle<Object> data);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_MESSAGES_H_