Deoptimizer support for hydrogen stubs that accept a variable number of 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 1293 matching lines @@
   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());
-    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;
-    }
+  Code* trampoline;
+  StubFailureTrampolineStub(false).FindCodeInCache(&trampoline, isolate());
+  if (trampoline->contains(pc())) {
+    return trampoline;
   }
+
+  StubFailureTrampolineStub(true).FindCodeInCache(&trampoline, isolate());
+  if (trampoline->contains(pc())) {
+    return trampoline;
+  }
+
   UNREACHABLE();
   return NULL;
 }
 
 
 // -------------------------------------------------------------------------
 
 
 JavaScriptFrame* StackFrameLocator::FindJavaScriptFrame(int n) {
   ASSERT(n >= 0);
@@ skipping 157 matching lines @@
   ZoneList<StackFrame*> list(10, zone);
   for (StackFrameIterator it(isolate); !it.done(); it.Advance()) {
     StackFrame* frame = AllocateFrameCopy(it.frame(), zone);
     list.Add(frame, zone);
   }
   return list.ToVector();
 }
 
 
 } }  // namespace v8::internal