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src/hotspot/share/gc/shenandoah/c1/shenandoahBarrierSetC1.cpp

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  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #include "precompiled.hpp"
 26 #include "c1/c1_IR.hpp"
 27 #include "gc/shared/satbMarkQueue.hpp"

 28 #include "gc/shenandoah/shenandoahBarrierSet.hpp"
 29 #include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp"
 30 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
 31 #include "gc/shenandoah/shenandoahHeapRegion.hpp"
 32 #include "gc/shenandoah/shenandoahRuntime.hpp"
 33 #include "gc/shenandoah/shenandoahThreadLocalData.hpp"
 34 #include "gc/shenandoah/c1/shenandoahBarrierSetC1.hpp"
 35 
 36 #ifdef ASSERT
 37 #define __ gen->lir(__FILE__, __LINE__)->
 38 #else
 39 #define __ gen->lir()->
 40 #endif
 41 
 42 void ShenandoahPreBarrierStub::emit_code(LIR_Assembler* ce) {
 43   ShenandoahBarrierSetAssembler* bs = (ShenandoahBarrierSetAssembler*)BarrierSet::barrier_set()->barrier_set_assembler();
 44   bs->gen_pre_barrier_stub(ce, this);
 45 }
 46 
 47 void ShenandoahLoadReferenceBarrierStub::emit_code(LIR_Assembler* ce) {

176   }
177   return obj;
178 }
179 
180 LIR_Opr ShenandoahBarrierSetC1::iu_barrier(LIRGenerator* gen, LIR_Opr obj, CodeEmitInfo* info, DecoratorSet decorators) {
181   if (ShenandoahIUBarrier) {
182     obj = ensure_in_register(gen, obj, T_OBJECT);
183     pre_barrier(gen, info, decorators, LIR_OprFact::illegalOpr, obj);
184   }
185   return obj;
186 }
187 
188 void ShenandoahBarrierSetC1::store_at_resolved(LIRAccess& access, LIR_Opr value) {
189   if (access.is_oop()) {
190     if (ShenandoahSATBBarrier) {
191       pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), access.resolved_addr(), LIR_OprFact::illegalOpr /* pre_val */);
192     }
193     value = iu_barrier(access.gen(), value, access.access_emit_info(), access.decorators());
194   }
195   BarrierSetC1::store_at_resolved(access, value);










196 }
197 
198 LIR_Opr ShenandoahBarrierSetC1::resolve_address(LIRAccess& access, bool resolve_in_register) {
199   // We must resolve in register when patching. This is to avoid
200   // having a patch area in the load barrier stub, since the call
201   // into the runtime to patch will not have the proper oop map.
202   const bool patch_before_barrier = access.is_oop() && (access.decorators() & C1_NEEDS_PATCHING) != 0;
203   return BarrierSetC1::resolve_address(access, resolve_in_register || patch_before_barrier);
204 }
205 
206 void ShenandoahBarrierSetC1::load_at_resolved(LIRAccess& access, LIR_Opr result) {
207   // 1: non-reference load, no additional barrier is needed
208   if (!access.is_oop()) {
209     BarrierSetC1::load_at_resolved(access, result);
210     return;
211   }
212 
213   LIRGenerator* gen = access.gen();
214   DecoratorSet decorators = access.decorators();
215   BasicType type = access.type();

274     _load_reference_barrier_strong_rt_code_blob = Runtime1::generate_blob(buffer_blob, -1,
275                                                                   "shenandoah_load_reference_barrier_strong_slow",
276                                                                   false, &lrb_strong_code_gen_cl);
277 
278     C1ShenandoahLoadReferenceBarrierCodeGenClosure lrb_strong_native_code_gen_cl(ON_STRONG_OOP_REF | IN_NATIVE);
279     _load_reference_barrier_strong_native_rt_code_blob = Runtime1::generate_blob(buffer_blob, -1,
280                                                                           "shenandoah_load_reference_barrier_strong_native_slow",
281                                                                           false, &lrb_strong_native_code_gen_cl);
282 
283     C1ShenandoahLoadReferenceBarrierCodeGenClosure lrb_weak_code_gen_cl(ON_WEAK_OOP_REF);
284     _load_reference_barrier_weak_rt_code_blob = Runtime1::generate_blob(buffer_blob, -1,
285                                                                           "shenandoah_load_reference_barrier_weak_slow",
286                                                                           false, &lrb_weak_code_gen_cl);
287 
288     C1ShenandoahLoadReferenceBarrierCodeGenClosure lrb_phantom_code_gen_cl(ON_PHANTOM_OOP_REF | IN_NATIVE);
289     _load_reference_barrier_phantom_rt_code_blob = Runtime1::generate_blob(buffer_blob, -1,
290                                                                            "shenandoah_load_reference_barrier_phantom_slow",
291                                                                            false, &lrb_phantom_code_gen_cl);
292   }
293 }






























































  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  *
 23  */
 24 
 25 #include "precompiled.hpp"
 26 #include "c1/c1_IR.hpp"
 27 #include "gc/shared/satbMarkQueue.hpp"
 28 #include "gc/shenandoah/mode/shenandoahMode.hpp"
 29 #include "gc/shenandoah/shenandoahBarrierSet.hpp"
 30 #include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp"
 31 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
 32 #include "gc/shenandoah/shenandoahHeapRegion.hpp"
 33 #include "gc/shenandoah/shenandoahRuntime.hpp"
 34 #include "gc/shenandoah/shenandoahThreadLocalData.hpp"
 35 #include "gc/shenandoah/c1/shenandoahBarrierSetC1.hpp"
 36 
 37 #ifdef ASSERT
 38 #define __ gen->lir(__FILE__, __LINE__)->
 39 #else
 40 #define __ gen->lir()->
 41 #endif
 42 
 43 void ShenandoahPreBarrierStub::emit_code(LIR_Assembler* ce) {
 44   ShenandoahBarrierSetAssembler* bs = (ShenandoahBarrierSetAssembler*)BarrierSet::barrier_set()->barrier_set_assembler();
 45   bs->gen_pre_barrier_stub(ce, this);
 46 }
 47 
 48 void ShenandoahLoadReferenceBarrierStub::emit_code(LIR_Assembler* ce) {

177   }
178   return obj;
179 }
180 
181 LIR_Opr ShenandoahBarrierSetC1::iu_barrier(LIRGenerator* gen, LIR_Opr obj, CodeEmitInfo* info, DecoratorSet decorators) {
182   if (ShenandoahIUBarrier) {
183     obj = ensure_in_register(gen, obj, T_OBJECT);
184     pre_barrier(gen, info, decorators, LIR_OprFact::illegalOpr, obj);
185   }
186   return obj;
187 }
188 
189 void ShenandoahBarrierSetC1::store_at_resolved(LIRAccess& access, LIR_Opr value) {
190   if (access.is_oop()) {
191     if (ShenandoahSATBBarrier) {
192       pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), access.resolved_addr(), LIR_OprFact::illegalOpr /* pre_val */);
193     }
194     value = iu_barrier(access.gen(), value, access.access_emit_info(), access.decorators());
195   }
196   BarrierSetC1::store_at_resolved(access, value);
197 
198   if (access.is_oop()) {
199     DecoratorSet decorators = access.decorators();
200     bool is_array = (decorators & IS_ARRAY) != 0;
201     bool on_anonymous = (decorators & ON_UNKNOWN_OOP_REF) != 0;
202 
203     bool precise = is_array || on_anonymous;
204     LIR_Opr post_addr = precise ? access.resolved_addr() : access.base().opr();
205     post_barrier(access, post_addr, value);
206   }
207 }
208 
209 LIR_Opr ShenandoahBarrierSetC1::resolve_address(LIRAccess& access, bool resolve_in_register) {
210   // We must resolve in register when patching. This is to avoid
211   // having a patch area in the load barrier stub, since the call
212   // into the runtime to patch will not have the proper oop map.
213   const bool patch_before_barrier = access.is_oop() && (access.decorators() & C1_NEEDS_PATCHING) != 0;
214   return BarrierSetC1::resolve_address(access, resolve_in_register || patch_before_barrier);
215 }
216 
217 void ShenandoahBarrierSetC1::load_at_resolved(LIRAccess& access, LIR_Opr result) {
218   // 1: non-reference load, no additional barrier is needed
219   if (!access.is_oop()) {
220     BarrierSetC1::load_at_resolved(access, result);
221     return;
222   }
223 
224   LIRGenerator* gen = access.gen();
225   DecoratorSet decorators = access.decorators();
226   BasicType type = access.type();

285     _load_reference_barrier_strong_rt_code_blob = Runtime1::generate_blob(buffer_blob, -1,
286                                                                   "shenandoah_load_reference_barrier_strong_slow",
287                                                                   false, &lrb_strong_code_gen_cl);
288 
289     C1ShenandoahLoadReferenceBarrierCodeGenClosure lrb_strong_native_code_gen_cl(ON_STRONG_OOP_REF | IN_NATIVE);
290     _load_reference_barrier_strong_native_rt_code_blob = Runtime1::generate_blob(buffer_blob, -1,
291                                                                           "shenandoah_load_reference_barrier_strong_native_slow",
292                                                                           false, &lrb_strong_native_code_gen_cl);
293 
294     C1ShenandoahLoadReferenceBarrierCodeGenClosure lrb_weak_code_gen_cl(ON_WEAK_OOP_REF);
295     _load_reference_barrier_weak_rt_code_blob = Runtime1::generate_blob(buffer_blob, -1,
296                                                                           "shenandoah_load_reference_barrier_weak_slow",
297                                                                           false, &lrb_weak_code_gen_cl);
298 
299     C1ShenandoahLoadReferenceBarrierCodeGenClosure lrb_phantom_code_gen_cl(ON_PHANTOM_OOP_REF | IN_NATIVE);
300     _load_reference_barrier_phantom_rt_code_blob = Runtime1::generate_blob(buffer_blob, -1,
301                                                                            "shenandoah_load_reference_barrier_phantom_slow",
302                                                                            false, &lrb_phantom_code_gen_cl);
303   }
304 }
305 
306 void ShenandoahBarrierSetC1::post_barrier(LIRAccess& access, LIR_OprDesc* addr, LIR_OprDesc* new_val) {
307   if (!ShenandoahHeap::heap()->mode()->is_generational()) {
308     return;
309   }
310 
311   DecoratorSet decorators = access.decorators();
312   LIRGenerator* gen = access.gen();
313   bool in_heap = (decorators & IN_HEAP) != 0;
314   if (!in_heap) {
315     return;
316   }
317 
318   BarrierSet* bs = BarrierSet::barrier_set();
319   ShenandoahBarrierSet* ctbs = barrier_set_cast<ShenandoahBarrierSet>(bs);
320   CardTable* ct = ctbs->card_table();
321   LIR_Const* card_table_base = new LIR_Const(ct->byte_map_base());
322   if (addr->is_address()) {
323     LIR_Address* address = addr->as_address_ptr();
324     // ptr cannot be an object because we use this barrier for array card marks
325     // and addr can point in the middle of an array.
326     LIR_Opr ptr = gen->new_pointer_register();
327     if (!address->index()->is_valid() && address->disp() == 0) {
328       __ move(address->base(), ptr);
329     } else {
330       assert(address->disp() != max_jint, "lea doesn't support patched addresses!");
331       __ leal(addr, ptr);
332     }
333     addr = ptr;
334   }
335   assert(addr->is_register(), "must be a register at this point");
336 
337   LIR_Opr tmp = gen->new_pointer_register();
338   if (TwoOperandLIRForm) {
339     __ move(addr, tmp);
340     __ unsigned_shift_right(tmp, CardTable::card_shift, tmp);
341   } else {
342     __ unsigned_shift_right(addr, CardTable::card_shift, tmp);
343   }
344 
345   LIR_Address* card_addr;
346   if (gen->can_inline_as_constant(card_table_base)) {
347     card_addr = new LIR_Address(tmp, card_table_base->as_jint(), T_BYTE);
348   } else {
349     card_addr = new LIR_Address(tmp, gen->load_constant(card_table_base), T_BYTE);
350   }
351 
352   LIR_Opr dirty = LIR_OprFact::intConst(CardTable::dirty_card_val());
353   if (UseCondCardMark) {
354     LIR_Opr cur_value = gen->new_register(T_INT);
355     __ move(card_addr, cur_value);
356 
357     LabelObj* L_already_dirty = new LabelObj();
358     __ cmp(lir_cond_equal, cur_value, dirty);
359     __ branch(lir_cond_equal, L_already_dirty->label());
360     __ move(dirty, card_addr);
361     __ branch_destination(L_already_dirty->label());
362   } else {
363     __ move(dirty, card_addr);
364   }
365 }
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