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 
  35 #define WB_METHOD_DECLARE(result_type) extern "C" result_type JNICALL
  36 
  37 // Unconditionally clear pedantic pending JNI checks
  38 class ClearPendingJniExcCheck : public StackObj {
  39 private:
  40   JavaThread* _thread;
  41 public:
  42   ClearPendingJniExcCheck(JNIEnv* env) : _thread(JavaThread::thread_from_jni_environment(env)) {}
  43   ~ClearPendingJniExcCheck() {
  44     _thread->clear_pending_jni_exception_check();
  45   }
  46 };
  47 
  48 class CodeBlob;
  49 class CodeHeap;
  50 class JavaThread;
  51 
  52 class WhiteBox : public AllStatic {
  53  private:
  54   static bool _used;
  55  public:
  56   static volatile bool compilation_locked;
  57   static bool used()     { return _used; }
  58   static void set_used() { _used = true; }
  59   static int offset_for_field(const char* field_name, oop object,
  60     Symbol* signature_symbol);
  61   static const char* lookup_jstring(const char* field_name, oop object);
  62   static bool lookup_bool(const char* field_name, oop object);
  63   static int get_blob_type(const CodeBlob* code);
  64   static CodeHeap* get_code_heap(int blob_type);
  65   static CodeBlob* allocate_code_blob(int size, int blob_type);
  66   static int array_bytes_to_length(size_t bytes);
  67   static void register_methods(JNIEnv* env, jclass wbclass, JavaThread* thread,
  68     JNINativeMethod* method_array, int method_count);
  69   static void register_extended(JNIEnv* env, jclass wbclass, JavaThread* thread);
  70   static bool compile_method(Method* method, int comp_level, int bci, Thread* THREAD);
  71 };
  72 
  73 #endif // SHARE_VM_PRIMS_WHITEBOX_HPP