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/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 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 ModRefBSCodeGen::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 }