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