jdk8-mips64-public/hotspot: src/share/vm/interpreter/rewriter.hpp@be93aad57795

6655646: dynamic languages need dynamically linked call sites
Summary: invokedynamic instruction (JSR 292 RI)
Reviewed-by: twisti, never

     1 /*

     2  * Copyright 1998-2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 // The Rewriter adds caches to the constant pool and rewrites bytecode indices

    26 // pointing into the constant pool for better interpreter performance.

    28 class Rewriter: public StackObj {

    29  private:

    30   instanceKlassHandle _klass;

    31   constantPoolHandle  _pool;

    32   objArrayHandle      _methods;

    33   intArray            _cp_map;

    34   intStack            _cp_cache_map;

    36   void init_cp_map(int length) {

    37     _cp_map.initialize(length, -1);

    38     // Choose an initial value large enough that we don't get frequent

    39     // calls to grow().

    40     _cp_cache_map.initialize(length / 2);

    41   }

    42   int  cp_entry_to_cp_cache(int i) { assert(has_cp_cache(i), "oob"); return _cp_map[i]; }

    43   bool has_cp_cache(int i) { return (uint)i < (uint)_cp_map.length() && _cp_map[i] >= 0; }

    44   int maybe_add_cp_cache_entry(int i) { return has_cp_cache(i) ? _cp_map[i] : add_cp_cache_entry(i); }

    45   int add_cp_cache_entry(int cp_index) {

    46     assert(_cp_map[cp_index] == -1, "not twice on same cp_index");

    47     int cache_index = _cp_cache_map.append(cp_index);

    48     _cp_map.at_put(cp_index, cache_index);

    49     assert(cp_entry_to_cp_cache(cp_index) == cache_index, "");

    50     return cache_index;

    51   }

    52   int add_extra_cp_cache_entry(int main_entry);

    54   // All the work goes in here:

    55   Rewriter(instanceKlassHandle klass, TRAPS);

    57   void compute_index_maps();

    58   void make_constant_pool_cache(TRAPS);

    59   void scan_method(methodOop m);

    60   methodHandle rewrite_jsrs(methodHandle m, TRAPS);

    61   void rewrite_Object_init(methodHandle m, TRAPS);

    62   int  rewrite_member_reference(address bcp, int offset);

    63   void rewrite_invokedynamic(address bcp, int offset, int cp_index);

    65  public:

    66   // Driver routine:

    67   static void rewrite(instanceKlassHandle klass, TRAPS);

    68 };

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