1 /*
   2  * Copyright (c) 2016, 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 "asm/macroAssembler.inline.hpp"
  27 #include "gc/shared/modRefBSCodeGen.hpp"
  28 
  29 #define __ masm->
  30 
  31 void ModRefBSCodeGen::arraycopy_prologue(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
  32                                          Register src, Register dst, Register count) {
  33   bool covariant = (decorators & DEST_COVARIANT) != 0;
  34   bool conjoint = (decorators & DEST_CONJOINT) != 0;
  35   bool disjoint = (decorators & DEST_DISJOINT) != 0;
  36   bool obj_int = type == T_OBJECT LP64_ONLY(&& UseCompressedOops);
  37 
  38   if (type == T_OBJECT || type == T_ARRAY) {
  39     if (covariant && !obj_int) {
  40       // Save count for barrier
  41       __ movptr(r11, count);
  42     } else if (covariant && disjoint && obj_int) {
  43       // Save dst in r11 in the disjoint covariant case
  44       __ movq(r11, dst);
  45     }
  46     gen_write_ref_array_pre_barrier(masm, decorators, dst, count);
  47   }
  48 }
  49 
  50 void ModRefBSCodeGen::arraycopy_epilogue(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
  51                                          Register src, Register dst, Register count) {
  52   bool covariant = (decorators & DEST_COVARIANT) != 0;
  53   bool contravariant = (decorators & DEST_CONTRAVARIANT) != 0;
  54   bool disjoint = (decorators & DEST_DISJOINT) != 0;
  55   bool obj_int = type == T_OBJECT LP64_ONLY(&& UseCompressedOops);
  56   Register tmp = rax;
  57 
  58   if (type == T_OBJECT || type == T_ARRAY) {
  59     if (covariant && !obj_int) {
  60       // Save count for barrier
  61       count = r11;
  62     } else if (covariant && disjoint && obj_int) {
  63       // Use the saved dst in the disjoint covariant case
  64       dst = r11;
  65     } else if (contravariant && disjoint) {
  66       tmp = rscratch1;
  67     }
  68     gen_write_ref_array_post_barrier(masm, decorators, dst, count, tmp);
  69   }
  70 }
  71 
  72 void ModRefBSCodeGen::oop_store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
  73                                    Address dst, Register val, Register tmp1, Register tmp2) {
  74   BarrierSetCodeGen::store_at(masm, decorators, type, dst, val, tmp1, tmp2);
  75 }
  76 
  77 void ModRefBSCodeGen::store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
  78                                Address dst, Register val, Register tmp1, Register tmp2) {
  79   if (type == T_OBJECT || type == T_ARRAY) {
  80     oop_store_at(masm, decorators, type, dst, val, tmp1, tmp2);
  81   } else {
  82     BarrierSetCodeGen::store_at(masm, decorators, type, dst, val, tmp1, tmp2);
  83   }
  84 }