1 /*
2 * Copyright (c) 2015, Red Hat, Inc. and/or its affiliates.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 #include "precompiled.hpp"
25 #include "gc_implementation/shenandoah/brooksPointer.hpp"
26 #include "gc_implementation/shenandoah/shenandoahBarrierSet.inline.hpp"
27
28 #include "asm/macroAssembler.hpp"
29 #include "interpreter/interpreter.hpp"
30
31 #define __ masm->
32
33 #ifndef CC_INTERP
34
35 void ShenandoahBarrierSet::interpreter_read_barrier(MacroAssembler* masm, Register dst) {
36 if (ShenandoahReadBarrier) {
37
38 Label is_null;
39 __ testptr(dst, dst);
40 __ jcc(Assembler::zero, is_null);
41 interpreter_read_barrier_not_null(masm, dst);
42 __ bind(is_null);
43 }
44 }
45
46 void ShenandoahBarrierSet::interpreter_read_barrier_not_null(MacroAssembler* masm, Register dst) {
47 if (ShenandoahReadBarrier) {
48 __ movptr(dst, Address(dst, BrooksPointer::byte_offset()));
49 }
50 }
51
52 void ShenandoahBarrierSet::interpreter_write_barrier(MacroAssembler* masm, Register dst) {
53
54 if (! ShenandoahWriteBarrier) {
55 return interpreter_read_barrier(masm, dst);
56 }
57
58 #ifdef _LP64
59 assert(dst != rscratch1, "different regs");
60
61 Label done;
62
63 Address gc_state(r15_thread, in_bytes(JavaThread::gc_state_offset()));
64
65 // Now check if evacuation is in progress.
66 __ testb(gc_state, ShenandoahHeap::HAS_FORWARDED | ShenandoahHeap::EVACUATION);
67 __ jcc(Assembler::zero, done);
68
69 // Heap is unstable, need to perform the read-barrier even if WB is inactive
70 interpreter_read_barrier_not_null(masm, dst);
71
72 __ testb(gc_state, ShenandoahHeap::EVACUATION);
73 __ jcc(Assembler::zero, done);
74 __ push(rscratch1);
75 __ push(rscratch2);
76
77 __ movptr(rscratch1, dst);
78 __ shrptr(rscratch1, ShenandoahHeapRegion::region_size_bytes_shift_jint());
79 __ movptr(rscratch2, (intptr_t) ShenandoahHeap::in_cset_fast_test_addr());
80 __ movbool(rscratch2, Address(rscratch2, rscratch1, Address::times_1));
81 __ testb(rscratch2, 0x1);
82
83 __ pop(rscratch2);
84 __ pop(rscratch1);
85
86 __ jcc(Assembler::zero, done);
87
88 __ push(rscratch1);
89
90 // Save possibly live regs.
91 if (dst != rax) {
92 __ push(rax);
93 }
94 if (dst != rbx) {
95 __ push(rbx);
96 }
97 if (dst != rcx) {
98 __ push(rcx);
99 }
100 if (dst != rdx) {
101 __ push(rdx);
102 }
103 if (dst != c_rarg1) {
104 __ push(c_rarg1);
105 }
106
107 __ subptr(rsp, 2 * wordSize);
108 __ movdbl(Address(rsp, 0), xmm0);
109
110 // Call into runtime
111 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, ShenandoahBarrierSet::write_barrier_IRT), dst);
112 __ mov(rscratch1, rax);
113
114 // Restore possibly live regs.
115 __ movdbl(xmm0, Address(rsp, 0));
116 __ addptr(rsp, 2 * Interpreter::stackElementSize);
117
118 if (dst != c_rarg1) {
119 __ pop(c_rarg1);
120 }
121 if (dst != rdx) {
122 __ pop(rdx);
123 }
124 if (dst != rcx) {
125 __ pop(rcx);
126 }
127 if (dst != rbx) {
128 __ pop(rbx);
129 }
130 if (dst != rax) {
131 __ pop(rax);
132 }
133
134 // Move result into dst reg.
135 __ mov(dst, rscratch1);
136
137 __ pop(rscratch1);
138
139 __ bind(done);
140 #else
141 Unimplemented();
142 #endif
143 }
144
145 void ShenandoahBarrierSet::asm_acmp_barrier(MacroAssembler* masm, Register op1, Register op2) {
146 assert (UseShenandoahGC, "Should be enabled");
147 if (ShenandoahAcmpBarrier) {
148 Label done;
149 __ jccb(Assembler::equal, done);
150 interpreter_read_barrier(masm, op1);
151 interpreter_read_barrier(masm, op2);
152 __ cmpptr(op1, op2);
153 __ bind(done);
154 }
155 }
156
157 void ShenandoahHeap::compile_prepare_oop(MacroAssembler* masm, Register obj) {
158 #ifdef _LP64
159 __ incrementq(obj, BrooksPointer::byte_size());
160 #else
161 __ incrementl(obj, BrooksPointer::byte_size());
162 #endif
163 __ movptr(Address(obj, BrooksPointer::byte_offset()), obj);
164 }
165 #endif