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/g1/g1BarrierSet.hpp"
28 #include "gc/g1/g1CardTable.hpp"
29 #include "gc/g1/g1BSCodeGen.hpp"
30 #include "gc/g1/heapRegion.hpp"
31 #include "gc/shared/collectedHeap.hpp"
32 #include "interpreter/interp_masm.hpp"
33 #include "runtime/sharedRuntime.hpp"
34 #include "runtime/thread.hpp"
35 #include "utilities/macros.hpp"
36 
37 #define __ masm->
38 
39 void G1BSCodeGen::gen_write_ref_array_pre_barrier(MacroAssembler* masm, DecoratorSet decorators, Register addr, Register count) {
40   bool dest_uninitialized = (decorators & AS_DEST_NOT_INITIALIZED) != 0;
41   // With G1, don't generate the call if we statically know that the target in uninitialized
42   if (!dest_uninitialized) {
43     __ save_frame(0);
44     // Save the necessary global regs... will be used after.
45     if (addr->is_global()) {
46       __ mov(addr, L0);
47     }
48     if (count->is_global()) {
49       __ mov(count, L1);
50     }
51     __ mov(addr->after_save(), O0);
52     // Get the count into O1
53     address slowpath = UseCompressedOops ? CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_pre_narrow_oop_entry)
54                                          : CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_pre_oop_entry);
55     __ call(slowpath);
56     __ delayed()->mov(count->after_save(), O1);
57     if (addr->is_global()) {
58       __ mov(L0, addr);
59     }
60     if (count->is_global()) {
61       __ mov(L1, count);
62     }
63     __ restore();
64   }
65 }
66 
67 void G1BSCodeGen::gen_write_ref_array_post_barrier(MacroAssembler* masm, DecoratorSet decorators, Register addr, Register count, Register tmp) {
68   // Get some new fresh output registers.
69   __ save_frame(0);
70   __ mov(addr->after_save(), O0);
71   __ call(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_post_entry));
72   __ delayed()->mov(count->after_save(), O1);
73   __ restore();
74 }