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 "asm/macroAssembler.inline.hpp"

    27 #include "gc/shared/modRefBarrierSetAssembler.hpp"

    28 

    29 #define __ masm->

    30 

    31 void ModRefBarrierSetAssembler::arraycopy_prologue(MacroAssembler* masm, DecoratorSet decorators, BasicType type,

    32                                                    Register src, Register dst, Register count) {

    33   bool checkcast = (decorators & ARRAYCOPY_CHECKCAST) != 0;

    34   bool disjoint = (decorators & ARRAYCOPY_DISJOINT) != 0;

    35   bool obj_int = type == T_OBJECT LP64_ONLY(&& UseCompressedOops);

    36 

    37   if (type == T_OBJECT || type == T_ARRAY) {

    38 #ifdef _LP64

    39     if (!checkcast && !obj_int) {

    40       // Save count for barrier

    41       __ movptr(r11, count);

    42     } else if (disjoint && obj_int) {

    43       // Save dst in r11 in the disjoint case

    44       __ movq(r11, dst);

    45     }

    46 #else

    47     if (disjoint) {

    48       __ mov(rdx, dst);          // save 'to'

    49     }

    50 #endif

    51     gen_write_ref_array_pre_barrier(masm, decorators, dst, count);

    52   }

    53 }

    54 

    55 void ModRefBarrierSetAssembler::arraycopy_epilogue(MacroAssembler* masm, DecoratorSet decorators, BasicType type,

    56                                                    Register src, Register dst, Register count) {

    57   bool checkcast = (decorators & ARRAYCOPY_CHECKCAST) != 0;

    58   bool disjoint = (decorators & ARRAYCOPY_DISJOINT) != 0;

    59   bool obj_int = type == T_OBJECT LP64_ONLY(&& UseCompressedOops);

    60   Register tmp = rax;

    61 

    62   if (type == T_OBJECT || type == T_ARRAY) {

    63 #ifdef _LP64

    64     if (!checkcast && !obj_int) {

    65       // Save count for barrier

    66       count = r11;

    67     } else if (disjoint && obj_int) {

    68       // Use the saved dst in the disjoint case

    69       dst = r11;

    70     } else if (checkcast) {

    71       tmp = rscratch1;

    72     }

    73 #else

    74     if (disjoint) {

    75       __ mov(dst, rdx); // restore 'to'

    76     }

    77 #endif

    78     gen_write_ref_array_post_barrier(masm, decorators, dst, count, tmp);

    79   }

    80 }