1 /*
2 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2018, SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "gc/g1/g1BarrierSet.hpp"
29 #include "gc/g1/g1CardTable.hpp"
30 #include "gc/g1/g1BarrierSetAssembler.hpp"
31 #include "gc/g1/heapRegion.hpp"
32 #include "gc/shared/collectedHeap.hpp"
33 #include "runtime/thread.hpp"
34 #include "interpreter/interp_masm.hpp"
35
36 #define __ masm->
37
38 void G1BarrierSetAssembler::gen_write_ref_array_pre_barrier(MacroAssembler* masm, DecoratorSet decorators,
39 Register from, Register to, Register count,
40 Register preserve1, Register preserve2) {
41 bool dest_uninitialized = (decorators & AS_DEST_NOT_INITIALIZED) != 0;
42 // With G1, don't generate the call if we statically know that the target in uninitialized
43 if (!dest_uninitialized) {
44 int spill_slots = 3;
45 if (preserve1 != noreg) { spill_slots++; }
46 if (preserve2 != noreg) { spill_slots++; }
47 const int frame_size = align_up(frame::abi_reg_args_size + spill_slots * BytesPerWord, frame::alignment_in_bytes);
48 Label filtered;
49
50 // Is marking active?
51 if (in_bytes(SATBMarkQueue::byte_width_of_active()) == 4) {
52 __ lwz(R0, in_bytes(JavaThread::satb_mark_queue_offset() + SATBMarkQueue::byte_offset_of_active()), R16_thread);
53 } else {
54 guarantee(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1, "Assumption");
55 __ lbz(R0, in_bytes(JavaThread::satb_mark_queue_offset() + SATBMarkQueue::byte_offset_of_active()), R16_thread);
56 }
57 __ cmpdi(CCR0, R0, 0);
58 __ beq(CCR0, filtered);
59
60 __ save_LR_CR(R0);
61 __ push_frame(frame_size, R0);
62 int slot_nr = 0;
63 __ std(from, frame_size - (++slot_nr) * wordSize, R1_SP);
64 __ std(to, frame_size - (++slot_nr) * wordSize, R1_SP);
65 __ std(count, frame_size - (++slot_nr) * wordSize, R1_SP);
66 if (preserve1 != noreg) { __ std(preserve1, frame_size - (++slot_nr) * wordSize, R1_SP); }
67 if (preserve2 != noreg) { __ std(preserve2, frame_size - (++slot_nr) * wordSize, R1_SP); }
68
69 if (UseCompressedOops) {
70 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_pre_narrow_oop_entry), to, count);
71 } else {
72 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_pre_oop_entry), to, count);
73 }
74
75 slot_nr = 0;
76 __ ld(from, frame_size - (++slot_nr) * wordSize, R1_SP);
77 __ ld(to, frame_size - (++slot_nr) * wordSize, R1_SP);
78 __ ld(count, frame_size - (++slot_nr) * wordSize, R1_SP);
79 if (preserve1 != noreg) { __ ld(preserve1, frame_size - (++slot_nr) * wordSize, R1_SP); }
80 if (preserve2 != noreg) { __ ld(preserve2, frame_size - (++slot_nr) * wordSize, R1_SP); }
81 __ addi(R1_SP, R1_SP, frame_size); // pop_frame()
82 __ restore_LR_CR(R0);
83
84 __ bind(filtered);
85 }
86 }
87
88 void G1BarrierSetAssembler::gen_write_ref_array_post_barrier(MacroAssembler* masm, DecoratorSet decorators,
89 Register addr, Register count, Register preserve) {
90 int spill_slots = (preserve != noreg) ? 1 : 0;
91 const int frame_size = align_up(frame::abi_reg_args_size + spill_slots * BytesPerWord, frame::alignment_in_bytes);
92
93 __ save_LR_CR(R0);
94 __ push_frame(frame_size, R0);
95 if (preserve != noreg) { __ std(preserve, frame_size - 1 * wordSize, R1_SP); }
96 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_post_entry), addr, count);
97 if (preserve != noreg) { __ ld(preserve, frame_size - 1 * wordSize, R1_SP); }
98 __ addi(R1_SP, R1_SP, frame_size); // pop_frame();
99 __ restore_LR_CR(R0);
100 }