138
139 // Can we store original value in the thread's buffer?
140 // Is index == 0?
141 // (The index field is typed as size_t.)
142
143 __ ldr(tmp1, index); // tmp := *index_adr
144 __ cbz(tmp1, runtime); // tmp == 0?
145 // If yes, goto runtime
146
147 __ sub(tmp1, tmp1, wordSize); // tmp := tmp - wordSize
148 __ str(tmp1, index); // *index_adr := tmp
149 __ ldr(tmp2, buffer);
150 __ add(tmp1, tmp1, tmp2); // tmp := tmp + *buffer_adr
151
152 // Record the previous value
153 __ str(pre_val, Address(tmp1, 0));
154 __ b(done);
155
156 __ bind(runtime);
157
158 __ push_call_clobbered_registers();
159
160 // Calling the runtime using the regular call_VM_leaf mechanism generates
161 // code (generated by InterpreterMacroAssember::call_VM_leaf_base)
162 // that checks that the *(rfp+frame::interpreter_frame_last_sp) == NULL.
163 //
164 // If we care generating the pre-barrier without a frame (e.g. in the
165 // intrinsified Reference.get() routine) then rfp might be pointing to
166 // the caller frame and so this check will most likely fail at runtime.
167 //
168 // Expanding the call directly bypasses the generation of the check.
169 // So when we do not have have a full interpreter frame on the stack
170 // expand_call should be passed true.
171
172 if (expand_call) {
173 assert(pre_val != c_rarg1, "smashed arg");
174 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSetRuntime::write_ref_field_pre_entry), pre_val, thread);
175 } else {
176 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSetRuntime::write_ref_field_pre_entry), pre_val, thread);
177 }
178
179 __ pop_call_clobbered_registers();
180
181 __ bind(done);
182
183 }
184
185 void G1BarrierSetAssembler::g1_write_barrier_post(MacroAssembler* masm,
186 Register store_addr,
187 Register new_val,
188 Register thread,
189 Register tmp1,
190 Register tmp2) {
191 assert(thread == rthread, "must be");
192 assert_different_registers(store_addr, new_val, thread, tmp1, tmp2,
193 rscratch1);
194 assert(store_addr != noreg && new_val != noreg && tmp1 != noreg
195 && tmp2 != noreg, "expecting a register");
196
197 Address queue_index(thread, in_bytes(G1ThreadLocalData::dirty_card_queue_index_offset()));
198 Address buffer(thread, in_bytes(G1ThreadLocalData::dirty_card_queue_buffer_offset()));
199
200 BarrierSet* bs = BarrierSet::barrier_set();
201 CardTableBarrierSet* ctbs = barrier_set_cast<CardTableBarrierSet>(bs);
202 CardTable* ct = ctbs->card_table();
203
204 Label done;
205 Label runtime;
206
207 // Does store cross heap regions?
208
209 __ eor(tmp1, store_addr, new_val);
210 __ lsr(tmp1, tmp1, HeapRegion::LogOfHRGrainBytes);
211 __ cbz(tmp1, done);
212
213 // crosses regions, storing NULL?
214
215 __ cbz(new_val, done);
216
217 // storing region crossing non-NULL, is card already dirty?
218
219 const Register card_addr = tmp1;
220
221 __ lsr(card_addr, store_addr, CardTable::card_shift());
222
223 // get the address of the card
224 __ load_byte_map_base(tmp2);
225 __ add(card_addr, card_addr, tmp2);
226 __ ldrb(tmp2, Address(card_addr));
227 __ cmpw(tmp2, (int)G1CardTable::g1_young_card_val());
228 __ br(Assembler::EQ, done);
229
230 assert((int)CardTable::dirty_card_val() == 0, "must be 0");
231
232 __ membar(Assembler::StoreLoad);
233
234 __ ldrb(tmp2, Address(card_addr));
235 __ cbzw(tmp2, done);
236
237 // storing a region crossing, non-NULL oop, card is clean.
238 // dirty card and log.
239
240 __ strb(zr, Address(card_addr));
241
242 __ ldr(rscratch1, queue_index);
243 __ cbz(rscratch1, runtime);
244 __ sub(rscratch1, rscratch1, wordSize);
245 __ str(rscratch1, queue_index);
246
247 __ ldr(tmp2, buffer);
248 __ str(card_addr, Address(tmp2, rscratch1));
249 __ b(done);
250
251 __ bind(runtime);
252 // save the live input values
253 RegSet saved = RegSet::of(store_addr);
254 __ push(saved, sp);
255 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSetRuntime::write_ref_field_post_entry), card_addr, thread);
256 __ pop(saved, sp);
257
258 __ bind(done);
259 }
260
261 void G1BarrierSetAssembler::load_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
262 Register dst, Address src, Register tmp1, Register tmp2) {
263 bool on_oop = is_reference_type(type);
264 bool on_weak = (decorators & ON_WEAK_OOP_REF) != 0;
265 bool on_phantom = (decorators & ON_PHANTOM_OOP_REF) != 0;
266 bool on_reference = on_weak || on_phantom;
267 ModRefBarrierSetAssembler::load_at(masm, decorators, type, dst, src, tmp1, tmp2);
268 if (on_oop && on_reference) {
269 // LR is live. It must be saved around calls.
270 __ enter(/*strip_ret_addr*/true); // barrier may call runtime
271 // Generate the G1 pre-barrier code to log the value of
272 // the referent field in an SATB buffer.
273 g1_write_barrier_pre(masm /* masm */,
274 noreg /* obj */,
275 dst /* pre_val */,
276 rthread /* thread */,
277 tmp1 /* tmp1 */,
278 tmp2 /* tmp2 */,
279 true /* tosca_live */,
280 true /* expand_call */);
281 __ leave();
282 }
283 }
284
285 void G1BarrierSetAssembler::oop_store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
286 Address dst, Register val, Register tmp1, Register tmp2, Register tmp3) {
287 // flatten object address if needed
288 if (dst.index() == noreg && dst.offset() == 0) {
289 if (dst.base() != tmp3) {
290 __ mov(tmp3, dst.base());
291 }
292 } else {
293 __ lea(tmp3, dst);
294 }
295
296 g1_write_barrier_pre(masm,
297 tmp3 /* obj */,
298 tmp2 /* pre_val */,
299 rthread /* thread */,
300 tmp1 /* tmp1 */,
301 rscratch2 /* tmp2 */,
302 val != noreg /* tosca_live */,
303 false /* expand_call */);
304
305 if (val == noreg) {
306 BarrierSetAssembler::store_at(masm, decorators, type, Address(tmp3, 0), noreg, noreg, noreg, noreg);
307 } else {
308 // G1 barrier needs uncompressed oop for region cross check.
309 Register new_val = val;
310 if (UseCompressedOops) {
311 new_val = rscratch2;
312 __ mov(new_val, val);
313 }
314 BarrierSetAssembler::store_at(masm, decorators, type, Address(tmp3, 0), val, noreg, noreg, noreg);
315 g1_write_barrier_post(masm,
316 tmp3 /* store_adr */,
317 new_val /* new_val */,
318 rthread /* thread */,
319 tmp1 /* tmp1 */,
320 tmp2 /* tmp2 */);
321 }
322
323 }
324
325 #ifdef COMPILER1
326
327 #undef __
328 #define __ ce->masm()->
329
330 void G1BarrierSetAssembler::gen_pre_barrier_stub(LIR_Assembler* ce, G1PreBarrierStub* stub) {
331 G1BarrierSetC1* bs = (G1BarrierSetC1*)BarrierSet::barrier_set()->barrier_set_c1();
332 // At this point we know that marking is in progress.
333 // If do_load() is true then we have to emit the
334 // load of the previous value; otherwise it has already
335 // been loaded into _pre_val.
336
337 __ bind(*stub->entry());
338
339 assert(stub->pre_val()->is_register(), "Precondition.");
340
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138
139 // Can we store original value in the thread's buffer?
140 // Is index == 0?
141 // (The index field is typed as size_t.)
142
143 __ ldr(tmp1, index); // tmp := *index_adr
144 __ cbz(tmp1, runtime); // tmp == 0?
145 // If yes, goto runtime
146
147 __ sub(tmp1, tmp1, wordSize); // tmp := tmp - wordSize
148 __ str(tmp1, index); // *index_adr := tmp
149 __ ldr(tmp2, buffer);
150 __ add(tmp1, tmp1, tmp2); // tmp := tmp + *buffer_adr
151
152 // Record the previous value
153 __ str(pre_val, Address(tmp1, 0));
154 __ b(done);
155
156 __ bind(runtime);
157
158 // save the live input values
159 RegSet saved = RegSet::of(pre_val);
160 FloatRegSet fsaved;
161
162 // Barriers might be emitted when converting between (scalarized) calling
163 // conventions for inline types. Save all argument registers before calling
164 // into the runtime.
165 if (EnableValhalla && InlineTypePassFieldsAsArgs) {
166 if (tosca_live) saved += RegSet::of(r0);
167 if (obj != noreg) saved += RegSet::of(obj);
168 saved += RegSet::of(j_rarg0, j_rarg1, j_rarg2, j_rarg3);
169 saved += RegSet::of(j_rarg4, j_rarg5, j_rarg6, j_rarg7);
170
171 fsaved += FloatRegSet::of(j_farg0, j_farg1, j_farg2, j_farg3);
172 fsaved += FloatRegSet::of(j_farg4, j_farg5, j_farg6, j_farg7);
173
174 __ push(saved, sp);
175 __ push_fp(fsaved, sp);
176 } else {
177 __ push_call_clobbered_registers();
178 }
179
180 // Calling the runtime using the regular call_VM_leaf mechanism generates
181 // code (generated by InterpreterMacroAssember::call_VM_leaf_base)
182 // that checks that the *(rfp+frame::interpreter_frame_last_sp) == NULL.
183 //
184 // If we care generating the pre-barrier without a frame (e.g. in the
185 // intrinsified Reference.get() routine) then rfp might be pointing to
186 // the caller frame and so this check will most likely fail at runtime.
187 //
188 // Expanding the call directly bypasses the generation of the check.
189 // So when we do not have have a full interpreter frame on the stack
190 // expand_call should be passed true.
191
192 if (expand_call) {
193 assert(pre_val != c_rarg1, "smashed arg");
194 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSetRuntime::write_ref_field_pre_entry), pre_val, thread);
195 } else {
196 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSetRuntime::write_ref_field_pre_entry), pre_val, thread);
197 }
198
199 if (EnableValhalla && InlineTypePassFieldsAsArgs) {
200 __ pop_fp(fsaved, sp);
201 __ pop(saved, sp);
202 } else {
203 __ pop_call_clobbered_registers();
204 }
205
206 __ bind(done);
207
208 }
209
210 void G1BarrierSetAssembler::g1_write_barrier_post(MacroAssembler* masm,
211 Register store_addr,
212 Register new_val,
213 Register thread,
214 Register tmp1,
215 Register tmp2) {
216 assert(thread == rthread, "must be");
217 assert_different_registers(store_addr, new_val, thread, tmp1, tmp2,
218 rscratch1);
219 assert(store_addr != noreg && new_val != noreg && tmp1 != noreg
220 && tmp2 != noreg, "expecting a register");
221
222 Address queue_index(thread, in_bytes(G1ThreadLocalData::dirty_card_queue_index_offset()));
223 Address buffer(thread, in_bytes(G1ThreadLocalData::dirty_card_queue_buffer_offset()));
224
225 BarrierSet* bs = BarrierSet::barrier_set();
226 CardTableBarrierSet* ctbs = barrier_set_cast<CardTableBarrierSet>(bs);
227 CardTable* ct = ctbs->card_table();
228
229 Label done;
230 Label runtime;
231
232 // Does store cross heap regions?
233
234 __ eor(tmp1, store_addr, new_val);
235 __ lsr(tmp1, tmp1, HeapRegion::LogOfHRGrainBytes);
236 __ cbz(tmp1, done);
237
238 // crosses regions, storing NULL?
239
240 __ cbz(new_val, done);
241
242 // storing region crossing non-NULL, is card already dirty?
243
244 assert_different_registers(store_addr, thread, tmp1, tmp2, rscratch1);
245
246 const Register card_addr = tmp1;
247
248 __ lsr(card_addr, store_addr, CardTable::card_shift());
249
250 // get the address of the card
251 __ load_byte_map_base(tmp2);
252 __ add(card_addr, card_addr, tmp2);
253 __ ldrb(tmp2, Address(card_addr));
254 __ cmpw(tmp2, (int)G1CardTable::g1_young_card_val());
255 __ br(Assembler::EQ, done);
256
257 assert((int)CardTable::dirty_card_val() == 0, "must be 0");
258
259 __ membar(Assembler::StoreLoad);
260
261 __ ldrb(tmp2, Address(card_addr));
262 __ cbzw(tmp2, done);
263
264 // storing a region crossing, non-NULL oop, card is clean.
265 // dirty card and log.
266
267 __ strb(zr, Address(card_addr));
268
269 __ ldr(rscratch1, queue_index);
270 __ cbz(rscratch1, runtime);
271 __ sub(rscratch1, rscratch1, wordSize);
272 __ str(rscratch1, queue_index);
273
274 __ ldr(tmp2, buffer);
275 __ str(card_addr, Address(tmp2, rscratch1));
276 __ b(done);
277
278 __ bind(runtime);
279
280 // save the live input values
281 RegSet saved = RegSet::of(store_addr);
282 FloatRegSet fsaved;
283
284 // Barriers might be emitted when converting between (scalarized) calling
285 // conventions for inline types. Save all argument registers before calling
286 // into the runtime.
287 if (EnableValhalla && InlineTypePassFieldsAsArgs) {
288 saved += RegSet::of(j_rarg0, j_rarg1, j_rarg2, j_rarg3);
289 saved += RegSet::of(j_rarg4, j_rarg5, j_rarg6, j_rarg7);
290
291 fsaved += FloatRegSet::of(j_farg0, j_farg1, j_farg2, j_farg3);
292 fsaved += FloatRegSet::of(j_farg4, j_farg5, j_farg6, j_farg7);
293 }
294
295 __ push(saved, sp);
296 __ push_fp(fsaved, sp);
297 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSetRuntime::write_ref_field_post_entry), card_addr, thread);
298 __ pop_fp(fsaved, sp);
299 __ pop(saved, sp);
300
301 __ bind(done);
302 }
303
304 void G1BarrierSetAssembler::load_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
305 Register dst, Address src, Register tmp1, Register tmp2) {
306 bool on_oop = is_reference_type(type);
307 bool on_weak = (decorators & ON_WEAK_OOP_REF) != 0;
308 bool on_phantom = (decorators & ON_PHANTOM_OOP_REF) != 0;
309 bool on_reference = on_weak || on_phantom;
310 ModRefBarrierSetAssembler::load_at(masm, decorators, type, dst, src, tmp1, tmp2);
311 if (on_oop && on_reference) {
312 // LR is live. It must be saved around calls.
313 __ enter(/*strip_ret_addr*/true); // barrier may call runtime
314 // Generate the G1 pre-barrier code to log the value of
315 // the referent field in an SATB buffer.
316 g1_write_barrier_pre(masm /* masm */,
317 noreg /* obj */,
318 dst /* pre_val */,
319 rthread /* thread */,
320 tmp1 /* tmp1 */,
321 tmp2 /* tmp2 */,
322 true /* tosca_live */,
323 true /* expand_call */);
324 __ leave();
325 }
326 }
327
328 void G1BarrierSetAssembler::oop_store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
329 Address dst, Register val, Register tmp1, Register tmp2, Register tmp3) {
330
331 bool in_heap = (decorators & IN_HEAP) != 0;
332 bool as_normal = (decorators & AS_NORMAL) != 0;
333 bool dest_uninitialized = (decorators & IS_DEST_UNINITIALIZED) != 0;
334
335 bool needs_pre_barrier = as_normal && !dest_uninitialized;
336 bool needs_post_barrier = (val != noreg && in_heap);
337
338 assert_different_registers(val, tmp1, tmp2, tmp3);
339
340 // flatten object address if needed
341 if (dst.index() == noreg && dst.offset() == 0) {
342 if (dst.base() != tmp3) {
343 __ mov(tmp3, dst.base());
344 }
345 } else {
346 __ lea(tmp3, dst);
347 }
348
349 if (needs_pre_barrier) {
350 g1_write_barrier_pre(masm,
351 tmp3 /* obj */,
352 tmp2 /* pre_val */,
353 rthread /* thread */,
354 tmp1 /* tmp1 */,
355 rscratch2 /* tmp2 */,
356 val != noreg /* tosca_live */,
357 false /* expand_call */);
358 }
359
360 if (val == noreg) {
361 BarrierSetAssembler::store_at(masm, decorators, type, Address(tmp3, 0), noreg, noreg, noreg, noreg);
362 } else {
363 // G1 barrier needs uncompressed oop for region cross check.
364 Register new_val = val;
365 if (needs_post_barrier) {
366 if (UseCompressedOops) {
367 new_val = rscratch2;
368 __ mov(new_val, val);
369 }
370 }
371
372 BarrierSetAssembler::store_at(masm, decorators, type, Address(tmp3, 0), val, noreg, noreg, noreg);
373 if (needs_post_barrier) {
374 g1_write_barrier_post(masm,
375 tmp3 /* store_adr */,
376 new_val /* new_val */,
377 rthread /* thread */,
378 tmp1 /* tmp1 */,
379 tmp2 /* tmp2 */);
380 }
381 }
382
383 }
384
385 #ifdef COMPILER1
386
387 #undef __
388 #define __ ce->masm()->
389
390 void G1BarrierSetAssembler::gen_pre_barrier_stub(LIR_Assembler* ce, G1PreBarrierStub* stub) {
391 G1BarrierSetC1* bs = (G1BarrierSetC1*)BarrierSet::barrier_set()->barrier_set_c1();
392 // At this point we know that marking is in progress.
393 // If do_load() is true then we have to emit the
394 // load of the previous value; otherwise it has already
395 // been loaded into _pre_val.
396
397 __ bind(*stub->entry());
398
399 assert(stub->pre_val()->is_register(), "Precondition.");
400
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