Support pass-through of stub caller arguments

src/frames.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1286 matching lines @@
 
 void InternalFrame::Iterate(ObjectVisitor* v) const {
   // Internal frames only have object pointers on the expression stack
   // as they never have any arguments.
   IterateExpressions(v);
   IteratePc(v, pc_address(), LookupCode());
 }
 
 
 void StubFailureTrampolineFrame::Iterate(ObjectVisitor* v) const {
+  Object** base = &Memory::Object_at(sp());
+  Object** limit = &Memory::Object_at(fp() +
+                                      kFirstRegisterParameterFrameOffset);
+  v->VisitPointers(base, limit);
+  base = &Memory::Object_at(fp() + StandardFrameConstants::kMarkerOffset);
   const int offset = StandardFrameConstants::kContextOffset;
-  Object** base = &Memory::Object_at(sp());
-  Object** limit = &Memory::Object_at(fp() + offset) + 1;
+  limit = &Memory::Object_at(fp() + offset) + 1;
   v->VisitPointers(base, limit);
   IteratePc(v, pc_address(), LookupCode());
 }
 
 
+Address StubFailureTrampolineFrame::GetCallerStackPointer() const {
+  return fp() + StandardFrameConstants::kCallerSPOffset;
+}
+
+
+Code* StubFailureTrampolineFrame::unchecked_code() const {
+  int i = 0;
+  for (; i <= StubFailureTrampolineStub::kMaxExtraExpressionStackCount; ++i) {
+    Code* trampoline;
+    StubFailureTrampolineStub(i).FindCodeInCache(&trampoline, isolate());

[Michael Starzinger, 2013/02/04 16:05:10]

Are we sure that this stub is in the cache? We should set the IsPregenerated
flag for these stubs to true and see if it trips any of our assertions.

+    ASSERT(trampoline != NULL);
+    Address current_pc = pc();
+    Address code_start = trampoline->instruction_start();
+    Address code_end = code_start + trampoline->instruction_size();
+    if (code_start <= current_pc && current_pc < code_end) {
+      return trampoline;
+    }
+  }
+  UNREACHABLE();
+  return NULL;
+}
+
+
 // -------------------------------------------------------------------------
 
 
 JavaScriptFrame* StackFrameLocator::FindJavaScriptFrame(int n) {
   ASSERT(n >= 0);
   for (int i = 0; i <= n; i++) {
     while (!iterator_.frame()->is_java_script()) iterator_.Advance();
     if (i == n) return JavaScriptFrame::cast(iterator_.frame());
     iterator_.Advance();
   }
@@ skipping 152 matching lines @@
   ZoneList<StackFrame*> list(10, zone);
   for (StackFrameIterator it; !it.done(); it.Advance()) {
     StackFrame* frame = AllocateFrameCopy(it.frame(), zone);
     list.Add(frame, zone);
   }
   return list.ToVector();
 }
 
 
 } }  // namespace v8::internal