1 /*
   2  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2015-2018, Azul Systems, Inc. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #ifndef CPU_AARCH64_GC_SHARED_MODREFBARRIERSETASSEMBLER_AARCH64_HPP
  27 #define CPU_AARCH64_GC_SHARED_MODREFBARRIERSETASSEMBLER_AARCH64_HPP
  28 
  29 #include "asm/macroAssembler.hpp"
  30 #include "gc/shared/barrierSetAssembler.hpp"
  31 
  32 // The ModRefBarrierSetAssembler filters away accesses on BasicTypes other
  33 // than T_OBJECT/T_ARRAY (oops). The oop accesses call one of the protected
  34 // accesses, which are overridden in the concrete BarrierSetAssembler.
  35 
  36 class ModRefBarrierSetAssembler: public BarrierSetAssembler {
  37 protected:
  38   // Generate code for an array write pre barrier
  39   //
  40   //     addr    -  starting address
  41   //     count   -  element count
  42   //
  43   //     Destroy no registers!
  44   //
  45   virtual void gen_write_ref_array_pre_barrier(MacroAssembler* masm, DecoratorSet decorators,
  46                                                Register addr, Register count) {}
  47 
  48   // Generate code for an array write post barrier
  49   //
  50   //  Input:
  51   //     start    - register containing starting address of destination array
  52   //     end      - register containing ending address of destination array
  53   //     scratch  - scratch register
  54   //
  55   //  The input registers are overwritten.
  56   //  The ending address is inclusive.
  57   virtual void gen_write_ref_array_post_barrier(MacroAssembler* masm, DecoratorSet decorators,
  58                                                 Register start, Register end, Register scratch) {}
  59 
  60   virtual void oop_store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
  61                             Address dst, Register val, Register tmp1, Register tmp2) = 0;
  62 
  63 public:
  64   virtual void arraycopy_prologue(MacroAssembler* masm, DecoratorSet decorators, bool is_oop,
  65                                   Register addr, Register count);
  66   virtual void arraycopy_epilogue(MacroAssembler* masm, DecoratorSet decorators, bool is_oop,
  67                                   Register start, Register end, Register scratch);
  68   virtual void store_word_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
  69                              Address dst, Register val, Register tmp1, Register tmp2);
  70 };
  71 
  72 #endif // CPU_AARCH64_GC_SHARED_MODREFBARRIERSETASSEMBLER_AARCH64_HPP