1 /*
   2  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_PRIMS_WHITEBOX_HPP
  26 #define SHARE_VM_PRIMS_WHITEBOX_HPP
  27 
  28 #include "prims/jni.h"
  29 
  30 #include "memory/allocation.hpp"
  31 #include "oops/oopsHierarchy.hpp"
  32 
  33 // Entry macro to transition from JNI to VM state.
  34 
  35 #define WB_ENTRY(result_type, header) JNI_ENTRY(result_type, header)
  36 #define WB_END JNI_END
  37 #define WB_METHOD_DECLARE(result_type) extern "C" result_type JNICALL
  38 
  39 #define CHECK_JNI_EXCEPTION_RETURN_VALUE(env, value) \
  40   do {                                               \
  41     if (env->ExceptionCheck()) {                     \
  42       env->ExceptionClear();                         \
  43       return(value);                                 \
  44     }                                                \
  45   } while (0)
  46 
  47 #define CHECK_JNI_EXCEPTION_RETURN(env) \
  48   do {                                  \
  49     if (env->ExceptionCheck()) {        \
  50       env->ExceptionClear();            \
  51       return;                           \
  52     }                                   \
  53   } while (0)
  54 
  55 class WhiteBox : public AllStatic {
  56  private:
  57   static bool _used;
  58  public:
  59   static bool used()     { return _used; }
  60   static void set_used() { _used = true; }
  61   static int offset_for_field(const char* field_name, oop object,
  62     Symbol* signature_symbol);
  63   static const char* lookup_jstring(const char* field_name, oop object);
  64   static bool lookup_bool(const char* field_name, oop object);
  65 };
  66 
  67 
  68 
  69 #endif // SHARE_VM_PRIMS_WHITEBOX_HPP