1 /*
   2  * Copyright (c) 2018, 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 #include "precompiled.hpp"
  26 #include "gc/shared/barrierSetAssembler.hpp"
  27 
  28 #define __ masm->
  29 
  30 void BarrierSetAssembler::load_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
  31                                   Register dst, Address src, Register tmp1, Register tmp2, Register tmp3) {
  32   bool on_heap = (decorators & IN_HEAP) != 0;
  33   bool in_native = (decorators & IN_NATIVE) != 0;
  34   switch (type) {
  35   case T_OBJECT:
  36   case T_ARRAY: {
  37     if (on_heap) {
  38 #ifdef AARCH64
  39       if (UseCompressedOops) {
  40         __ ldr_w(dst, src);
  41         __ decode_heap_oop(dst);
  42       } else
  43 #endif // AARCH64
  44       {
  45         __ ldr(dst, src);
  46       }
  47     } else {
  48       assert(in_native, "why else?");
  49       __ ldr(dst, src);
  50     }
  51     break;
  52   }
  53   default: Unimplemented();
  54   }
  55 
  56 }
  57 
  58 void BarrierSetAssembler::store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
  59                                    Address obj, Register val, Register tmp1, Register tmp2, Register tmp3, bool is_null) {
  60   bool on_heap = (decorators & IN_HEAP) != 0;
  61   bool in_native = (decorators & IN_NATIVE) != 0;
  62   switch (type) {
  63   case T_OBJECT:
  64   case T_ARRAY: {
  65     if (on_heap) {
  66 #ifdef AARCH64
  67       if (UseCompressedOops) {
  68         assert(!dst.uses(src), "not enough registers");
  69         if (!is_null) {
  70           __ encode_heap_oop(src);
  71         }
  72         __ str_w(val, obj);
  73       } else
  74 #endif // AARCH64
  75       {
  76         __ str(val, obj);
  77       }
  78     } else {
  79       assert(in_native, "why else?");
  80       __ str(val, obj);
  81     }
  82     break;
  83   }
  84   default: Unimplemented();
  85   }
  86 }
  87