Support pass-through of stub caller arguments

src/frames.cc

Index: src/frames.cc
diff --git a/src/frames.cc b/src/frames.cc
index 98b3d65f955ed9eac36b52fc1f4dc365447bbfa7..40abf640363e5ab0322ce39c5cabd3fafdeed485 100644
--- a/src/frames.cc
+++ b/src/frames.cc
@@ -1304,14 +1304,41 @@ void InternalFrame::Iterate(ObjectVisitor* v) const {
 
 
 void StubFailureTrampolineFrame::Iterate(ObjectVisitor* v) const {
-  const int offset = StandardFrameConstants::kContextOffset;
   Object** base = &Memory::Object_at(sp());
-  Object** limit = &Memory::Object_at(fp() + offset) + 1;
+  Object** limit = &Memory::Object_at(fp() +
+                                      kFirstRegisterParameterFrameOffset);
+  v->VisitPointers(base, limit);
+  base = &Memory::Object_at(fp() + StandardFrameConstants::kMarkerOffset);
+  const int offset = StandardFrameConstants::kContextOffset;
+  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;
+}
+
+
 // -------------------------------------------------------------------------