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->new_register(T_OBJECT); 118 __ move(obj, result); 119 120 LIR_Opr thrd = gen->getThreadPointer(); 121 LIR_Address* active_flag_addr = 122 new LIR_Address(thrd, 123 in_bytes(ShenandoahThreadLocalData::gc_state_offset()), 124 T_BYTE); 125 // Read and check the gc-state-flag. 126 LIR_Opr flag_val = gen->new_register(T_INT); 127 __ load(active_flag_addr, flag_val); 128 LIR_Opr mask = LIR_OprFact::intConst(ShenandoahHeap::HAS_FORWARDED | 129 ShenandoahHeap::EVACUATION | 130 ShenandoahHeap::TRAVERSAL); 131 LIR_Opr mask_reg = gen->new_register(T_INT); 132 __ move(mask, mask_reg); 133 134 if (TwoOperandLIRForm) { 135 __ logical_and(flag_val, mask_reg, flag_val); 136 } else { 137 LIR_Opr masked_flag = gen->new_register(T_INT); 138 __ logical_and(flag_val, mask_reg, masked_flag); 139 flag_val = masked_flag; 140 } 141 __ cmp(lir_cond_notEqual, flag_val, LIR_OprFact::intConst(0)); 142 143 CodeStub* slow = new ShenandoahLoadReferenceBarrierStub(obj, result); 144 __ branch(lir_cond_notEqual, T_INT, slow); 145 __ branch_destination(slow->continuation()); 146 147 return result; 148 } 149 150 LIR_Opr ShenandoahBarrierSetC1::ensure_in_register(LIRGenerator* gen, LIR_Opr obj) { 151 if (!obj->is_register()) { 152 LIR_Opr obj_reg = gen->new_register(T_OBJECT); 153 if (obj->is_constant()) { 154 __ move(obj, obj_reg); 155 } else { 156 __ leal(obj, obj_reg); 157 } 158 obj = obj_reg; 159 } 160 return obj; 161 } 162 163 LIR_Opr ShenandoahBarrierSetC1::storeval_barrier(LIRGenerator* gen, LIR_Opr obj, CodeEmitInfo* info, DecoratorSet decorators) { 164 if (ShenandoahStoreValEnqueueBarrier) { 165 obj = ensure_in_register(gen, obj); 166 pre_barrier(gen, info, decorators, LIR_OprFact::illegalOpr, obj); 167 } 168 return obj; 169 } 170 171 void ShenandoahBarrierSetC1::store_at_resolved(LIRAccess& access, LIR_Opr value) { 172 if (access.is_oop()) { 173 if (ShenandoahSATBBarrier) { 174 pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), access.resolved_addr(), LIR_OprFact::illegalOpr /* pre_val */); 175 } 176 value = storeval_barrier(access.gen(), value, access.access_emit_info(), access.decorators()); 177 } 178 BarrierSetC1::store_at_resolved(access, value); 179 } 180 181 void ShenandoahBarrierSetC1::load_at_resolved(LIRAccess& access, LIR_Opr result) { 182 if (!access.is_oop()) { 183 BarrierSetC1::load_at_resolved(access, result); 184 return; 185 } 186 187 LIRGenerator* gen = access.gen(); 188 189 DecoratorSet decorators = access.decorators(); 190 if ((decorators & IN_NATIVE) != 0) { 191 assert(access.is_oop(), "IN_NATIVE access only for oop values"); 192 BarrierSetC1::load_at_resolved(access, result); 193 LIR_OprList* args = new LIR_OprList(); 194 args->append(result); 195 BasicTypeList signature; 196 signature.append(T_OBJECT); 197 LIR_Opr call_result = gen->call_runtime(&signature, args, 198 CAST_FROM_FN_PTR(address, ShenandoahRuntime::load_reference_barrier_native), 199 objectType, NULL); 200 __ move(call_result, result); 201 return; 202 } 203 204 if (ShenandoahLoadRefBarrier) { 205 LIR_Opr tmp = gen->new_register(T_OBJECT); 206 BarrierSetC1::load_at_resolved(access, tmp); 207 tmp = load_reference_barrier(access.gen(), tmp); 208 __ move(tmp, result); 209 } else { 210 BarrierSetC1::load_at_resolved(access, result); 211 } 212 213 if (ShenandoahKeepAliveBarrier) { 214 bool is_weak = (decorators & ON_WEAK_OOP_REF) != 0; 215 bool is_phantom = (decorators & ON_PHANTOM_OOP_REF) != 0; 216 bool is_anonymous = (decorators & ON_UNKNOWN_OOP_REF) != 0; 217 if (is_weak || is_phantom || is_anonymous) { 218 // Register the value in the referent field with the pre-barrier 219 LabelObj *Lcont_anonymous; 220 if (is_anonymous) { 221 Lcont_anonymous = new LabelObj(); 222 generate_referent_check(access, Lcont_anonymous); 223 } 224 pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), LIR_OprFact::illegalOpr /* addr_opr */, 225 result /* pre_val */); 226 if (is_anonymous) { 227 __ branch_destination(Lcont_anonymous->label()); 228 } 229 } 230 } 231 } 232 233 class C1ShenandoahPreBarrierCodeGenClosure : public StubAssemblerCodeGenClosure { 234 virtual OopMapSet* generate_code(StubAssembler* sasm) { 235 ShenandoahBarrierSetAssembler* bs = (ShenandoahBarrierSetAssembler*)BarrierSet::barrier_set()->barrier_set_assembler(); 236 bs->generate_c1_pre_barrier_runtime_stub(sasm); 237 return NULL; 238 } 239 }; 240 241 void ShenandoahBarrierSetC1::generate_c1_runtime_stubs(BufferBlob* buffer_blob) { 242 C1ShenandoahPreBarrierCodeGenClosure pre_code_gen_cl; 243 _pre_barrier_c1_runtime_code_blob = Runtime1::generate_blob(buffer_blob, -1, 244 "shenandoah_pre_barrier_slow", 245 false, &pre_code_gen_cl); 246 } 247 248 const char* ShenandoahBarrierSetC1::rtcall_name_for_address(address entry) { 249 if (entry == CAST_FROM_FN_PTR(address, ShenandoahRuntime::load_reference_barrier_native)) { 250 return "ShenandoahRuntime::load_reference_barrier_native"; 251 } 252 return NULL; 253 }