hotspot/src/share/vm/runtime/jniHandles.hpp

rev 7151 : 8043224: -Xcheck:jni improvements to exception checking and excessive local refs
Summary: Warning when not checking exceptions from function that require so, also when local refs expand beyond capacity.
Reviewed-by: dsimms

*** 1,7 ****
  /*
!  * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
--- 1,7 ----
  /*
!  * Copyright (c) 1998, 2015, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
*** 110,119 ****
--- 110,122 ----
    JNIHandleBlock* _last;                        // Last block in use
    JNIHandleBlock* _pop_frame_link;              // Block to restore on PopLocalFrame call
    oop*            _free_list;                   // Handle free list
    int             _allocate_before_rebuild;     // Number of blocks to allocate before rebuilding free list
  
+   // Check JNI, "planned capacity" for current frame (or push/ensure)
+   size_t          _planned_capacity;
+ 
    #ifndef PRODUCT
    JNIHandleBlock* _block_list_link;             // Link for list below
    static JNIHandleBlock* _block_list;           // List of all allocated blocks (for debugging only)
    #endif
  
*** 150,159 ****
--- 153,167 ----
    // Traversal of regular handles
    void oops_do(OopClosure* f);
    // Traversal of weak handles. Unreachable oops are cleared.
    void weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f);
  
+   // Checked JNI support
+   void set_planned_capacity(size_t planned_capacity) { _planned_capacity = planned_capacity; }
+   const size_t get_planned_capacity() { return _planned_capacity; }
+   const size_t get_number_of_live_handles();
+ 
    // Debugging
    bool chain_contains(jobject handle) const;    // Does this block or following blocks contain handle
    bool contains(jobject handle) const;          // Does this block contain handle
    int length() const;                           // Length of chain starting with this block
    long memory_usage() const;