From 80c9e32b4fd58ee73df507fc49c1c3c25d443b0f Mon Sep 17 00:00:00 2001
From: emc <unknown>
Date: Tue, 19 Feb 2013 11:36:52 -0500
Subject: [PATCH] 8007153: Ensure that MethodParameters API works properly with
 RedefineClasses Summary: Adds code to HotSpot to properly update
 MethodParameter attributes' constant pool indexes when redefineClasses is
 called Reviewed-by: coleenp, sspitsyn

---
 src/share/vm/oops/method.hpp                |  2 ++
 src/share/vm/prims/jvmtiRedefineClasses.cpp | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/src/share/vm/oops/method.hpp b/src/share/vm/oops/method.hpp
index a2d24ebca..0c6203fc6 100644
--- a/src/share/vm/oops/method.hpp
+++ b/src/share/vm/oops/method.hpp
@@ -456,6 +456,8 @@ class Method : public Metadata {
   void print_codes_on(int from, int to, outputStream* st) const    PRODUCT_RETURN;
 
   // method parameters
+  bool has_method_parameters() const
+                         { return constMethod()->has_method_parameters(); }
   int method_parameters_length() const
                          { return constMethod()->method_parameters_length(); }
   MethodParametersElement* method_parameters_start() const
diff --git a/src/share/vm/prims/jvmtiRedefineClasses.cpp b/src/share/vm/prims/jvmtiRedefineClasses.cpp
index 14cb63c60..9eaa07a09 100644
--- a/src/share/vm/prims/jvmtiRedefineClasses.cpp
+++ b/src/share/vm/prims/jvmtiRedefineClasses.cpp
@@ -1558,6 +1558,18 @@ void VM_RedefineClasses::rewrite_cp_refs_in_method(methodHandle method,
       } break;
     }
   } // end for each bytecode
+
+  // We also need to rewrite the parameter name indexes, if there is
+  // method parameter data present
+  if(method->has_method_parameters()) {
+    const int len = method->method_parameters_length();
+    MethodParametersElement* elem = method->method_parameters_start();
+
+    for (int i = 0; i < len; i++) {
+      const u2 cp_index = elem[i].name_cp_index;
+      elem[i].name_cp_index = find_new_index(cp_index);
+    }
+  }
 } // end rewrite_cp_refs_in_method()
 
 
-- 
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