1 /*
   2  * Copyright (c) 2012, 2017, 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 "jni.h"
  29 
  30 #include "utilities/exceptions.hpp"
  31 #include "memory/allocation.hpp"
  32 #include "oops/oopsHierarchy.hpp"
  33 #include "oops/symbol.hpp"
  34 #include "runtime/interfaceSupport.hpp"

  35 
  36 // Unconditionally clear pedantic pending JNI checks
  37 class ClearPendingJniExcCheck : public StackObj {
  38 private:
  39   JavaThread* _thread;
  40 public:
  41   ClearPendingJniExcCheck(JNIEnv* env) : _thread(JavaThread::thread_from_jni_environment(env)) {}
  42   ~ClearPendingJniExcCheck() {
  43     _thread->clear_pending_jni_exception_check();
  44   }
  45 };
  46 
  47 // Entry macro to transition from JNI to VM state.
  48 
  49 #define WB_ENTRY(result_type, header) JNI_ENTRY(result_type, header) \
  50   ClearPendingJniExcCheck _clearCheck(env);
  51 
  52 #define WB_END JNI_END
  53 #define WB_METHOD_DECLARE(result_type) extern "C" result_type JNICALL
  54 
  55 #define CHECK_JNI_EXCEPTION_(env, value)                               \
  56   do {                                                                 \
  57     JavaThread* THREAD = JavaThread::thread_from_jni_environment(env); \
  58     if (HAS_PENDING_EXCEPTION) {                                       \
  59       return(value);                                                   \
  60     }                                                                  \
  61   } while (0)
  62 
  63 #define CHECK_JNI_EXCEPTION(env)                                       \
  64   do {                                                                 \
  65     JavaThread* THREAD = JavaThread::thread_from_jni_environment(env); \
  66     if (HAS_PENDING_EXCEPTION) {                                       \
  67       return;                                                          \
  68     }                                                                  \
  69   } while (0)
  70 
  71 class CodeBlob;
  72 class CodeHeap;
  73 class JavaThread;
  74 
  75 class WhiteBox : public AllStatic {
  76  private:
  77   static bool _used;
  78  public:
  79   static volatile bool compilation_locked;
  80   static bool used()     { return _used; }
  81   static void set_used() { _used = true; }
  82   static int offset_for_field(const char* field_name, oop object,
  83     Symbol* signature_symbol);
  84   static const char* lookup_jstring(const char* field_name, oop object);
  85   static bool lookup_bool(const char* field_name, oop object);
  86   static int get_blob_type(const CodeBlob* code);
  87   static CodeHeap* get_code_heap(int blob_type);
  88   static CodeBlob* allocate_code_blob(int size, int blob_type);
  89   static int array_bytes_to_length(size_t bytes);
  90   static void register_methods(JNIEnv* env, jclass wbclass, JavaThread* thread,
  91     JNINativeMethod* method_array, int method_count);
  92   static void register_extended(JNIEnv* env, jclass wbclass, JavaThread* thread);
  93   static bool compile_method(Method* method, int comp_level, int bci, Thread* THREAD);
  94 };
  95 
  96 
  97 
  98 #endif // SHARE_VM_PRIMS_WHITEBOX_HPP
--- EOF ---