1 /*
2 * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
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 "c1/c1_IR.hpp"
26 #include "gc/shared/satbMarkQueue.hpp"
27 #include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp"
28 #include "gc/shenandoah/shenandoahHeap.hpp"
29 #include "gc/shenandoah/shenandoahHeapRegion.hpp"
30 #include "gc/shenandoah/shenandoahRuntime.hpp"
31 #include "gc/shenandoah/shenandoahThreadLocalData.hpp"
32 #include "gc/shenandoah/c1/shenandoahBarrierSetC1.hpp"
33
34 #ifdef ASSERT
35 #define __ gen->lir(__FILE__, __LINE__)->
36 #else
37 #define __ gen->lir()->
38 #endif
39
40 void ShenandoahPreBarrierStub::emit_code(LIR_Assembler* ce) {
41 ShenandoahBarrierSetAssembler* bs = (ShenandoahBarrierSetAssembler*)BarrierSet::barrier_set()->barrier_set_assembler();
42 bs->gen_pre_barrier_stub(ce, this);
43 }
44
45 void ShenandoahLoadReferenceBarrierStub::emit_code(LIR_Assembler* ce) {
46 ShenandoahBarrierSetAssembler* bs = (ShenandoahBarrierSetAssembler*)BarrierSet::barrier_set()->barrier_set_assembler();
47 bs->gen_load_reference_barrier_stub(ce, this);
48 }
49
50 void ShenandoahBarrierSetC1::pre_barrier(LIRGenerator* gen, CodeEmitInfo* info, DecoratorSet decorators, LIR_Opr addr_opr, LIR_Opr pre_val) {
51 // First we test whether marking is in progress.
52 BasicType flag_type;
53 bool patch = (decorators & C1_NEEDS_PATCHING) != 0;
54 bool do_load = pre_val == LIR_OprFact::illegalOpr;
55 if (in_bytes(SATBMarkQueue::byte_width_of_active()) == 4) {
56 flag_type = T_INT;
57 } else {
58 guarantee(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1,
59 "Assumption");
60 // Use unsigned type T_BOOLEAN here rather than signed T_BYTE since some platforms, eg. ARM,
61 // need to use unsigned instructions to use the large offset to load the satb_mark_queue.
62 flag_type = T_BOOLEAN;
63 }
64 LIR_Opr thrd = gen->getThreadPointer();
65 LIR_Address* mark_active_flag_addr =
66 new LIR_Address(thrd,
67 in_bytes(ShenandoahThreadLocalData::satb_mark_queue_active_offset()),
68 flag_type);
69 // Read the marking-in-progress flag.
70 LIR_Opr flag_val = gen->new_register(T_INT);
71 __ load(mark_active_flag_addr, flag_val);
72 __ cmp(lir_cond_notEqual, flag_val, LIR_OprFact::intConst(0));
73
74 LIR_PatchCode pre_val_patch_code = lir_patch_none;
75
76 CodeStub* slow;
77
78 if (do_load) {
79 assert(pre_val == LIR_OprFact::illegalOpr, "sanity");
80 assert(addr_opr != LIR_OprFact::illegalOpr, "sanity");
81
82 if (patch)
83 pre_val_patch_code = lir_patch_normal;
84
85 pre_val = gen->new_register(T_OBJECT);
86
87 if (!addr_opr->is_address()) {
88 assert(addr_opr->is_register(), "must be");
89 addr_opr = LIR_OprFact::address(new LIR_Address(addr_opr, T_OBJECT));
90 }
91 slow = new ShenandoahPreBarrierStub(addr_opr, pre_val, pre_val_patch_code, info ? new CodeEmitInfo(info) : NULL);
92 } else {
93 assert(addr_opr == LIR_OprFact::illegalOpr, "sanity");
94 assert(pre_val->is_register(), "must be");
95 assert(pre_val->type() == T_OBJECT, "must be an object");
96
97 slow = new ShenandoahPreBarrierStub(pre_val);
98 }
99
100 __ branch(lir_cond_notEqual, T_INT, slow);
101 __ branch_destination(slow->continuation());
102 }
103
104 LIR_Opr ShenandoahBarrierSetC1::load_reference_barrier(LIRGenerator* gen, LIR_Opr obj) {
105 if (ShenandoahLoadRefBarrier) {
106 return load_reference_barrier_impl(gen, obj);
107 } else {
108 return obj;
109 }
110 }
111
112 LIR_Opr ShenandoahBarrierSetC1::load_reference_barrier_impl(LIRGenerator* gen, LIR_Opr obj) {
113 assert(ShenandoahLoadRefBarrier, "Should be enabled");
114
115 obj = ensure_in_register(gen, obj);
116 assert(obj->is_register(), "must be a register at this point");
117 LIR_Opr result = gen->result_register_for(obj->value_type());
118 __ move(obj, result);
119 LIR_Opr tmp1 = gen->new_register(T_OBJECT);
120 LIR_Opr tmp2 = gen->new_register(T_OBJECT);
121
122 LIR_Opr thrd = gen->getThreadPointer();
123 LIR_Address* active_flag_addr =
124 new LIR_Address(thrd,
125 in_bytes(ShenandoahThreadLocalData::gc_state_offset()),
126 T_BYTE);
127 // Read and check the gc-state-flag.
128 LIR_Opr flag_val = gen->new_register(T_INT);
129 __ load(active_flag_addr, flag_val);
130 LIR_Opr mask = LIR_OprFact::intConst(ShenandoahHeap::HAS_FORWARDED |
131 ShenandoahHeap::EVACUATION |
132 ShenandoahHeap::TRAVERSAL);
133 LIR_Opr mask_reg = gen->new_register(T_INT);
134 __ move(mask, mask_reg);
135
136 if (TwoOperandLIRForm) {
137 __ logical_and(flag_val, mask_reg, flag_val);
138 } else {
139 LIR_Opr masked_flag = gen->new_register(T_INT);
140 __ logical_and(flag_val, mask_reg, masked_flag);
141 flag_val = masked_flag;
142 }
143 __ cmp(lir_cond_notEqual, flag_val, LIR_OprFact::intConst(0));
144
145 CodeStub* slow = new ShenandoahLoadReferenceBarrierStub(obj, result, tmp1, tmp2);
146 __ branch(lir_cond_notEqual, T_INT, slow);
147 __ branch_destination(slow->continuation());
148
149 return result;
150 }
151
152 LIR_Opr ShenandoahBarrierSetC1::ensure_in_register(LIRGenerator* gen, LIR_Opr obj) {
153 if (!obj->is_register()) {
154 LIR_Opr obj_reg = gen->new_register(T_OBJECT);
155 if (obj->is_constant()) {
156 __ move(obj, obj_reg);
157 } else {
158 __ leal(obj, obj_reg);
159 }
160 obj = obj_reg;
161 }
162 return obj;
163 }
164
165 LIR_Opr ShenandoahBarrierSetC1::storeval_barrier(LIRGenerator* gen, LIR_Opr obj, CodeEmitInfo* info, DecoratorSet decorators) {
166 if (ShenandoahStoreValEnqueueBarrier) {
167 obj = ensure_in_register(gen, obj);
168 pre_barrier(gen, info, decorators, LIR_OprFact::illegalOpr, obj);
169 }
170 return obj;
171 }
172
173 void ShenandoahBarrierSetC1::store_at_resolved(LIRAccess& access, LIR_Opr value) {
174 if (access.is_oop()) {
175 if (ShenandoahSATBBarrier) {
176 pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), access.resolved_addr(), LIR_OprFact::illegalOpr /* pre_val */);
177 }
178 value = storeval_barrier(access.gen(), value, access.access_emit_info(), access.decorators());
179 }
180 BarrierSetC1::store_at_resolved(access, value);
181 }
182
183 void ShenandoahBarrierSetC1::load_at_resolved(LIRAccess& access, LIR_Opr result) {
184 if (!access.is_oop()) {
185 BarrierSetC1::load_at_resolved(access, result);
186 return;
187 }
188
189 LIRGenerator* gen = access.gen();
190
191 DecoratorSet decorators = access.decorators();
192 if ((decorators & IN_NATIVE) != 0) {
193 assert(access.is_oop(), "IN_NATIVE access only for oop values");
194 BarrierSetC1::load_at_resolved(access, result);
195 LIR_OprList* args = new LIR_OprList();
196 args->append(result);
197 BasicTypeList signature;
198 signature.append(T_OBJECT);
199 LIR_Opr call_result = gen->call_runtime(&signature, args,
200 CAST_FROM_FN_PTR(address, ShenandoahRuntime::load_reference_barrier_native),
201 objectType, NULL);
202 __ move(call_result, result);
203 return;
204 }
205
206 if (ShenandoahLoadRefBarrier) {
207 LIR_Opr tmp = gen->new_register(T_OBJECT);
208 BarrierSetC1::load_at_resolved(access, tmp);
209 tmp = load_reference_barrier(access.gen(), tmp);
210 __ move(tmp, result);
211 } else {
212 BarrierSetC1::load_at_resolved(access, result);
213 }
214
215 if (ShenandoahKeepAliveBarrier) {
216 bool is_weak = (decorators & ON_WEAK_OOP_REF) != 0;
217 bool is_phantom = (decorators & ON_PHANTOM_OOP_REF) != 0;
218 bool is_anonymous = (decorators & ON_UNKNOWN_OOP_REF) != 0;
219 if (is_weak || is_phantom || is_anonymous) {
220 // Register the value in the referent field with the pre-barrier
221 LabelObj *Lcont_anonymous;
222 if (is_anonymous) {
223 Lcont_anonymous = new LabelObj();
224 generate_referent_check(access, Lcont_anonymous);
225 }
226 pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), LIR_OprFact::illegalOpr /* addr_opr */,
227 result /* pre_val */);
228 if (is_anonymous) {
229 __ branch_destination(Lcont_anonymous->label());
230 }
231 }
232 }
233 }
234
235 class C1ShenandoahPreBarrierCodeGenClosure : public StubAssemblerCodeGenClosure {
236 virtual OopMapSet* generate_code(StubAssembler* sasm) {
237 ShenandoahBarrierSetAssembler* bs = (ShenandoahBarrierSetAssembler*)BarrierSet::barrier_set()->barrier_set_assembler();
238 bs->generate_c1_pre_barrier_runtime_stub(sasm);
239 return NULL;
240 }
241 };
242
243 class C1ShenandoahLoadReferenceBarrierCodeGenClosure : public StubAssemblerCodeGenClosure {
244 virtual OopMapSet* generate_code(StubAssembler* sasm) {
245 ShenandoahBarrierSetAssembler* bs = (ShenandoahBarrierSetAssembler*)BarrierSet::barrier_set()->barrier_set_assembler();
246 bs->generate_c1_load_reference_barrier_runtime_stub(sasm);
247 return NULL;
248 }
249 };
250
251 void ShenandoahBarrierSetC1::generate_c1_runtime_stubs(BufferBlob* buffer_blob) {
252 C1ShenandoahPreBarrierCodeGenClosure pre_code_gen_cl;
253 _pre_barrier_c1_runtime_code_blob = Runtime1::generate_blob(buffer_blob, -1,
254 "shenandoah_pre_barrier_slow",
255 false, &pre_code_gen_cl);
256 if (ShenandoahLoadRefBarrier) {
257 C1ShenandoahLoadReferenceBarrierCodeGenClosure lrb_code_gen_cl;
258 _load_reference_barrier_rt_code_blob = Runtime1::generate_blob(buffer_blob, -1,
259 "shenandoah_load_reference_barrier_slow",
260 false, &lrb_code_gen_cl);
261 }
262 }
263
264 const char* ShenandoahBarrierSetC1::rtcall_name_for_address(address entry) {
265 if (entry == CAST_FROM_FN_PTR(address, ShenandoahRuntime::load_reference_barrier_native)) {
266 return "ShenandoahRuntime::load_reference_barrier_native";
267 }
268 return NULL;
269 }