VM: New calling convention for generated code.

runtime/vm/weak_code.cc

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/weak_code.h"
 
 #include "platform/assert.h"
 
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 99 matching lines @@
       function.SwitchToUnoptimizedCode();
     } else if (function.unoptimized_code() == code.raw()) {
       ReportSwitchingCode(code);
       function.ClearICDataArray();
       // Remove the code object from the function. The next time the
       // function is invoked, it will be compiled again.
       function.ClearCode();
       // Invalidate the old code object so existing references to it
       // (from optimized code) will fail when invoked.
       if (!CodePatcher::IsEntryPatched(code)) {
-        CodePatcher::PatchEntry(code);
+        CodePatcher::PatchEntry(
+            code, Code::Handle(StubCode::FixCallersTarget_entry()->code()));
       }
     } else {
       // Make non-OSR code non-entrant.
-      if (code.GetEntryPatchPc() != 0) {
-        if (!CodePatcher::IsEntryPatched(code)) {
-          ReportSwitchingCode(code);
-          CodePatcher::PatchEntry(code);
-        }
+      if (!CodePatcher::IsEntryPatched(code)) {
+        ReportSwitchingCode(code);
+        CodePatcher::PatchEntry(
+            code, Code::Handle(StubCode::FixCallersTarget_entry()->code()));
       }
     }
   }
 }
 
 }  // namespace dart