wasm: implemente WasmFrame::cast, fix inheritance

src/frames.cc

 // Copyright 2012 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/frames.h"
 
 #include <sstream>
 
 #include "src/ast/ast.h"
 #include "src/ast/scopeinfo.h"
@@ skipping 748 matching lines @@
     int byte_index = index >> kBitsPerByteLog2;
     int bit_index = index & (kBitsPerByte - 1);
     if ((safepoint_bits[byte_index] & (1U << bit_index)) != 0) {
       v->VisitPointer(parameters_limit + index);
     }
   }
 
   // Visit the return address in the callee and incoming arguments.
   IteratePc(v, pc_address(), constant_pool_address(), code);
 
-  if (!is_wasm() && !is_wasm_to_js()) {
+  if (!is_wasm() || is_wasm_to_js()) {

[bradnelson, 2016/03/29 17:06:57]

don't do that...

[JF, 2016/03/29 17:08:17]

Thought I'd backed that off.

     // Visit the context in stub frame and JavaScript frame.
     // Visit the function in JavaScript frame.
     v->VisitPointers(frame_header_base, frame_header_limit);
   }
 }
 
 
 void StubFrame::Iterate(ObjectVisitor* v) const {
   IterateCompiledFrame(v);
 }
@@ skipping 942 matching lines @@
   for (StackFrameIterator it(isolate); !it.done(); it.Advance()) {
     StackFrame* frame = AllocateFrameCopy(it.frame(), zone);
     list.Add(frame, zone);
   }
   return list.ToVector();
 }
 
 
 }  // namespace internal
 }  // namespace v8