author | rkennke |
Mon, 10 Dec 2018 15:47:44 +0100 | |
changeset 52925 | 9c18c9d839d3 |
child 54423 | 6c0ab8bd8da5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2018, Red Hat, Inc. All rights reserved. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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|
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#include "precompiled.hpp" |
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#include "c1/c1_IR.hpp" |
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#include "gc/shared/satbMarkQueue.hpp" |
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#include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp" |
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#include "gc/shenandoah/shenandoahBrooksPointer.hpp" |
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#include "gc/shenandoah/shenandoahHeap.hpp" |
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#include "gc/shenandoah/shenandoahHeapRegion.hpp" |
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#include "gc/shenandoah/shenandoahThreadLocalData.hpp" |
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#include "gc/shenandoah/c1/shenandoahBarrierSetC1.hpp" |
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#ifndef PATCHED_ADDR |
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#define PATCHED_ADDR (max_jint) |
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#endif |
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#ifdef ASSERT |
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#define __ gen->lir(__FILE__, __LINE__)-> |
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#else |
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#define __ gen->lir()-> |
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#endif |
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void ShenandoahPreBarrierStub::emit_code(LIR_Assembler* ce) { |
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ShenandoahBarrierSetAssembler* bs = (ShenandoahBarrierSetAssembler*)BarrierSet::barrier_set()->barrier_set_assembler(); |
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bs->gen_pre_barrier_stub(ce, this); |
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} |
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void ShenandoahWriteBarrierStub::emit_code(LIR_Assembler* ce) { |
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ShenandoahBarrierSetAssembler* bs = (ShenandoahBarrierSetAssembler*)BarrierSet::barrier_set()->barrier_set_assembler(); |
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bs->gen_write_barrier_stub(ce, this); |
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} |
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void ShenandoahBarrierSetC1::pre_barrier(LIRGenerator* gen, CodeEmitInfo* info, DecoratorSet decorators, LIR_Opr addr_opr, LIR_Opr pre_val) { |
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// First we test whether marking is in progress. |
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BasicType flag_type; |
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bool patch = (decorators & C1_NEEDS_PATCHING) != 0; |
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bool do_load = pre_val == LIR_OprFact::illegalOpr; |
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if (in_bytes(SATBMarkQueue::byte_width_of_active()) == 4) { |
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flag_type = T_INT; |
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} else { |
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guarantee(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1, |
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"Assumption"); |
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// Use unsigned type T_BOOLEAN here rather than signed T_BYTE since some platforms, eg. ARM, |
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// need to use unsigned instructions to use the large offset to load the satb_mark_queue. |
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flag_type = T_BOOLEAN; |
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} |
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LIR_Opr thrd = gen->getThreadPointer(); |
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LIR_Address* mark_active_flag_addr = |
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new LIR_Address(thrd, |
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in_bytes(ShenandoahThreadLocalData::satb_mark_queue_active_offset()), |
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flag_type); |
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// Read the marking-in-progress flag. |
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LIR_Opr flag_val = gen->new_register(T_INT); |
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__ load(mark_active_flag_addr, flag_val); |
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__ cmp(lir_cond_notEqual, flag_val, LIR_OprFact::intConst(0)); |
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LIR_PatchCode pre_val_patch_code = lir_patch_none; |
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CodeStub* slow; |
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if (do_load) { |
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assert(pre_val == LIR_OprFact::illegalOpr, "sanity"); |
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assert(addr_opr != LIR_OprFact::illegalOpr, "sanity"); |
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if (patch) |
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pre_val_patch_code = lir_patch_normal; |
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pre_val = gen->new_register(T_OBJECT); |
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if (!addr_opr->is_address()) { |
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assert(addr_opr->is_register(), "must be"); |
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addr_opr = LIR_OprFact::address(new LIR_Address(addr_opr, T_OBJECT)); |
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} |
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slow = new ShenandoahPreBarrierStub(addr_opr, pre_val, pre_val_patch_code, info ? new CodeEmitInfo(info) : NULL); |
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} else { |
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assert(addr_opr == LIR_OprFact::illegalOpr, "sanity"); |
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assert(pre_val->is_register(), "must be"); |
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assert(pre_val->type() == T_OBJECT, "must be an object"); |
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101 |
slow = new ShenandoahPreBarrierStub(pre_val); |
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102 |
} |
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|
103 |
|
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104 |
__ branch(lir_cond_notEqual, T_INT, slow); |
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105 |
__ branch_destination(slow->continuation()); |
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|
106 |
} |
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|
107 |
|
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108 |
LIR_Opr ShenandoahBarrierSetC1::read_barrier(LIRGenerator* gen, LIR_Opr obj, CodeEmitInfo* info, bool need_null_check) { |
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|
109 |
if (UseShenandoahGC && ShenandoahReadBarrier) { |
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110 |
return read_barrier_impl(gen, obj, info, need_null_check); |
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111 |
} else { |
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112 |
return obj; |
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113 |
} |
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114 |
} |
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|
115 |
|
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116 |
LIR_Opr ShenandoahBarrierSetC1::read_barrier_impl(LIRGenerator* gen, LIR_Opr obj, CodeEmitInfo* info, bool need_null_check) { |
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117 |
assert(UseShenandoahGC && (ShenandoahReadBarrier || ShenandoahStoreValReadBarrier), "Should be enabled"); |
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118 |
LabelObj* done = new LabelObj(); |
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119 |
LIR_Opr result = gen->new_register(T_OBJECT); |
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120 |
__ move(obj, result); |
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121 |
if (need_null_check) { |
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122 |
__ cmp(lir_cond_equal, result, LIR_OprFact::oopConst(NULL)); |
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123 |
__ branch(lir_cond_equal, T_LONG, done->label()); |
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124 |
} |
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125 |
LIR_Address* brooks_ptr_address = gen->generate_address(result, ShenandoahBrooksPointer::byte_offset(), T_ADDRESS); |
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126 |
__ load(brooks_ptr_address, result, info ? new CodeEmitInfo(info) : NULL, lir_patch_none); |
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|
127 |
|
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|
128 |
__ branch_destination(done->label()); |
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129 |
return result; |
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|
130 |
} |
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|
131 |
|
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|
132 |
LIR_Opr ShenandoahBarrierSetC1::write_barrier(LIRGenerator* gen, LIR_Opr obj, CodeEmitInfo* info, bool need_null_check) { |
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|
133 |
if (UseShenandoahGC && ShenandoahWriteBarrier) { |
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|
134 |
return write_barrier_impl(gen, obj, info, need_null_check); |
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|
135 |
} else { |
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|
136 |
return obj; |
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|
137 |
} |
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|
138 |
} |
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|
139 |
|
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|
140 |
LIR_Opr ShenandoahBarrierSetC1::write_barrier_impl(LIRGenerator* gen, LIR_Opr obj, CodeEmitInfo* info, bool need_null_check) { |
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|
141 |
assert(UseShenandoahGC && (ShenandoahWriteBarrier || ShenandoahStoreValEnqueueBarrier), "Should be enabled"); |
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|
142 |
|
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|
143 |
obj = ensure_in_register(gen, obj); |
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|
144 |
assert(obj->is_register(), "must be a register at this point"); |
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|
145 |
LIR_Opr result = gen->new_register(T_OBJECT); |
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|
146 |
__ move(obj, result); |
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|
147 |
|
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|
148 |
LIR_Opr thrd = gen->getThreadPointer(); |
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|
149 |
LIR_Address* active_flag_addr = |
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|
150 |
new LIR_Address(thrd, |
9c18c9d839d3
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|
151 |
in_bytes(ShenandoahThreadLocalData::gc_state_offset()), |
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|
152 |
T_BYTE); |
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|
153 |
// Read and check the gc-state-flag. |
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|
154 |
LIR_Opr flag_val = gen->new_register(T_INT); |
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|
155 |
__ load(active_flag_addr, flag_val); |
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|
156 |
LIR_Opr mask = LIR_OprFact::intConst(ShenandoahHeap::HAS_FORWARDED | |
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|
157 |
ShenandoahHeap::EVACUATION | |
9c18c9d839d3
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|
158 |
ShenandoahHeap::TRAVERSAL); |
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|
159 |
LIR_Opr mask_reg = gen->new_register(T_INT); |
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|
160 |
__ move(mask, mask_reg); |
9c18c9d839d3
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|
161 |
|
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|
162 |
if (TwoOperandLIRForm) { |
9c18c9d839d3
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|
163 |
__ logical_and(flag_val, mask_reg, flag_val); |
9c18c9d839d3
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|
164 |
} else { |
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|
165 |
LIR_Opr masked_flag = gen->new_register(T_INT); |
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|
166 |
__ logical_and(flag_val, mask_reg, masked_flag); |
9c18c9d839d3
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|
167 |
flag_val = masked_flag; |
9c18c9d839d3
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|
168 |
} |
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|
169 |
__ cmp(lir_cond_notEqual, flag_val, LIR_OprFact::intConst(0)); |
9c18c9d839d3
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|
170 |
|
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|
171 |
CodeStub* slow = new ShenandoahWriteBarrierStub(obj, result, info ? new CodeEmitInfo(info) : NULL, need_null_check); |
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|
172 |
__ branch(lir_cond_notEqual, T_INT, slow); |
9c18c9d839d3
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|
173 |
__ branch_destination(slow->continuation()); |
9c18c9d839d3
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|
174 |
|
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|
175 |
return result; |
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|
176 |
} |
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|
177 |
|
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|
178 |
LIR_Opr ShenandoahBarrierSetC1::ensure_in_register(LIRGenerator* gen, LIR_Opr obj) { |
9c18c9d839d3
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|
179 |
if (!obj->is_register()) { |
9c18c9d839d3
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|
180 |
LIR_Opr obj_reg = gen->new_register(T_OBJECT); |
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|
181 |
if (obj->is_constant()) { |
9c18c9d839d3
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|
182 |
__ move(obj, obj_reg); |
9c18c9d839d3
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|
183 |
} else { |
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|
184 |
__ leal(obj, obj_reg); |
9c18c9d839d3
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|
185 |
} |
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|
186 |
obj = obj_reg; |
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|
187 |
} |
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|
188 |
return obj; |
9c18c9d839d3
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|
189 |
} |
9c18c9d839d3
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|
190 |
|
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|
191 |
LIR_Opr ShenandoahBarrierSetC1::storeval_barrier(LIRGenerator* gen, LIR_Opr obj, CodeEmitInfo* info, DecoratorSet decorators) { |
9c18c9d839d3
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|
192 |
bool need_null_check = (decorators & IS_NOT_NULL) == 0; |
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|
193 |
if (ShenandoahStoreValEnqueueBarrier) { |
9c18c9d839d3
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|
194 |
obj = write_barrier_impl(gen, obj, info, need_null_check); |
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|
195 |
pre_barrier(gen, info, decorators, LIR_OprFact::illegalOpr, obj); |
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|
196 |
} |
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|
197 |
if (ShenandoahStoreValReadBarrier) { |
9c18c9d839d3
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|
198 |
obj = read_barrier_impl(gen, obj, info, true /*need_null_check*/); |
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|
199 |
} |
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|
200 |
return obj; |
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|
201 |
} |
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|
202 |
|
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203 |
LIR_Opr ShenandoahBarrierSetC1::resolve_address(LIRAccess& access, bool resolve_in_register) { |
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DecoratorSet decorators = access.decorators(); |
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bool is_array = (decorators & IS_ARRAY) != 0; |
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bool needs_patching = (decorators & C1_NEEDS_PATCHING) != 0; |
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|
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bool is_write = (decorators & ACCESS_WRITE) != 0; |
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bool needs_null_check = (decorators & IS_NOT_NULL) == 0; |
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|
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LIR_Opr base = access.base().item().result(); |
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LIR_Opr offset = access.offset().opr(); |
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LIRGenerator* gen = access.gen(); |
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|
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if (is_write) { |
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base = write_barrier(gen, base, access.access_emit_info(), needs_null_check); |
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} else { |
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base = read_barrier(gen, base, access.access_emit_info(), needs_null_check); |
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} |
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|
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LIR_Opr addr_opr; |
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if (is_array) { |
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addr_opr = LIR_OprFact::address(gen->emit_array_address(base, offset, access.type())); |
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} else if (needs_patching) { |
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// we need to patch the offset in the instruction so don't allow |
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// generate_address to try to be smart about emitting the -1. |
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// Otherwise the patching code won't know how to find the |
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// instruction to patch. |
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addr_opr = LIR_OprFact::address(new LIR_Address(base, PATCHED_ADDR, access.type())); |
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} else { |
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addr_opr = LIR_OprFact::address(gen->generate_address(base, offset, 0, 0, access.type())); |
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} |
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233 |
|
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if (resolve_in_register) { |
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LIR_Opr resolved_addr = gen->new_pointer_register(); |
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__ leal(addr_opr, resolved_addr); |
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resolved_addr = LIR_OprFact::address(new LIR_Address(resolved_addr, access.type())); |
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return resolved_addr; |
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} else { |
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return addr_opr; |
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} |
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} |
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243 |
|
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void ShenandoahBarrierSetC1::store_at_resolved(LIRAccess& access, LIR_Opr value) { |
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if (access.is_oop()) { |
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if (ShenandoahSATBBarrier) { |
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pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), access.resolved_addr(), LIR_OprFact::illegalOpr /* pre_val */); |
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} |
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value = storeval_barrier(access.gen(), value, access.access_emit_info(), access.decorators()); |
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} |
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BarrierSetC1::store_at_resolved(access, value); |
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} |
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253 |
|
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void ShenandoahBarrierSetC1::load_at_resolved(LIRAccess& access, LIR_Opr result) { |
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BarrierSetC1::load_at_resolved(access, result); |
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256 |
|
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if (ShenandoahKeepAliveBarrier) { |
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DecoratorSet decorators = access.decorators(); |
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bool is_weak = (decorators & ON_WEAK_OOP_REF) != 0; |
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bool is_phantom = (decorators & ON_PHANTOM_OOP_REF) != 0; |
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bool is_anonymous = (decorators & ON_UNKNOWN_OOP_REF) != 0; |
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LIRGenerator *gen = access.gen(); |
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if (access.is_oop() && (is_weak || is_phantom || is_anonymous)) { |
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// Register the value in the referent field with the pre-barrier |
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LabelObj *Lcont_anonymous; |
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if (is_anonymous) { |
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Lcont_anonymous = new LabelObj(); |
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generate_referent_check(access, Lcont_anonymous); |
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} |
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pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), LIR_OprFact::illegalOpr /* addr_opr */, |
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result /* pre_val */); |
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if (is_anonymous) { |
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__ branch_destination(Lcont_anonymous->label()); |
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} |
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} |
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} |
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} |
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278 |
|
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LIR_Opr ShenandoahBarrierSetC1::atomic_add_at_resolved(LIRAccess& access, LIRItem& value) { |
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return BarrierSetC1::atomic_add_at_resolved(access, value); |
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} |
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282 |
|
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LIR_Opr ShenandoahBarrierSetC1::resolve(LIRGenerator* gen, DecoratorSet decorators, LIR_Opr obj) { |
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bool is_write = decorators & ACCESS_WRITE; |
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if (is_write) { |
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return write_barrier(gen, obj, NULL, (decorators & IS_NOT_NULL) == 0); |
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} else { |
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return read_barrier(gen, obj, NULL, (decorators & IS_NOT_NULL) == 0); |
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} |
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290 |
} |
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291 |
|
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class C1ShenandoahPreBarrierCodeGenClosure : public StubAssemblerCodeGenClosure { |
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virtual OopMapSet* generate_code(StubAssembler* sasm) { |
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ShenandoahBarrierSetAssembler* bs = (ShenandoahBarrierSetAssembler*)BarrierSet::barrier_set()->barrier_set_assembler(); |
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bs->generate_c1_pre_barrier_runtime_stub(sasm); |
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return NULL; |
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} |
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298 |
}; |
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299 |
|
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void ShenandoahBarrierSetC1::generate_c1_runtime_stubs(BufferBlob* buffer_blob) { |
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C1ShenandoahPreBarrierCodeGenClosure pre_code_gen_cl; |
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_pre_barrier_c1_runtime_code_blob = Runtime1::generate_blob(buffer_blob, -1, |
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"shenandoah_pre_barrier_slow", |
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false, &pre_code_gen_cl); |
9c18c9d839d3
8214259: Implementation: JEP 189: Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)
rkennke
parents:
diff
changeset
|
305 |
} |