163 cmpxchgptr(disp_hdr, hdr, obj, rscratch2, done, &slow_case);
164 }
165 // done
166 bind(done);
167 }
168 decrement(Address(rthread, JavaThread::held_monitor_count_offset()));
169 }
170
171
172 // Defines obj, preserves var_size_in_bytes
173 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
174 if (UseTLAB) {
175 tlab_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
176 } else {
177 b(slow_case);
178 }
179 }
180
181 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
182 assert_different_registers(obj, klass, len);
183 // This assumes that all prototype bits fit in an int32_t
184 mov(t1, (int32_t)(intptr_t)markWord::prototype().value());
185 str(t1, Address(obj, oopDesc::mark_offset_in_bytes()));
186
187 if (UseCompressedClassPointers) { // Take care not to kill klass
188 encode_klass_not_null(t1, klass);
189 strw(t1, Address(obj, oopDesc::klass_offset_in_bytes()));
190 } else {
191 str(klass, Address(obj, oopDesc::klass_offset_in_bytes()));
192 }
193
194 if (len->is_valid()) {
195 strw(len, Address(obj, arrayOopDesc::length_offset_in_bytes()));
196 } else if (UseCompressedClassPointers) {
197 store_klass_gap(obj, zr);
198 }
199 }
200
201 // preserves obj, destroys len_in_bytes
202 //
203 // Scratch registers: t1 = r10, t2 = r11
204 //
205 void C1_MacroAssembler::initialize_body(Register obj, Register len_in_bytes, int hdr_size_in_bytes, Register t1, Register t2) {
206 assert(hdr_size_in_bytes >= 0, "header size must be positive or 0");
207 assert(t1 == r10 && t2 == r11, "must be");
208
209 Label done;
210
211 // len_in_bytes is positive and ptr sized
212 subs(len_in_bytes, len_in_bytes, hdr_size_in_bytes);
213 br(Assembler::EQ, done);
214
215 // zero_words() takes ptr in r10 and count in words in r11
216 mov(rscratch1, len_in_bytes);
254 } else if (con_size_in_bytes > hdr_size_in_bytes) {
255 con_size_in_bytes -= hdr_size_in_bytes;
256 lea(t1, Address(obj, hdr_size_in_bytes));
257 address tpc = zero_words(t1, con_size_in_bytes / BytesPerWord);
258 if (tpc == nullptr) {
259 Compilation::current()->bailout("no space for trampoline stub");
260 return;
261 }
262 }
263 }
264
265 membar(StoreStore);
266
267 if (CURRENT_ENV->dtrace_alloc_probes()) {
268 assert(obj == r0, "must be");
269 far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
270 }
271
272 verify_oop(obj);
273 }
274 void C1_MacroAssembler::allocate_array(Register obj, Register len, Register t1, Register t2, int header_size, int f, Register klass, Label& slow_case) {
275 assert_different_registers(obj, len, t1, t2, klass);
276
277 // determine alignment mask
278 assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work");
279
280 // check for negative or excessive length
281 mov(rscratch1, (int32_t)max_array_allocation_length);
282 cmp(len, rscratch1);
283 br(Assembler::HS, slow_case);
284
285 const Register arr_size = t2; // okay to be the same
286 // align object end
287 mov(arr_size, (int32_t)header_size * BytesPerWord + MinObjAlignmentInBytesMask);
288 add(arr_size, arr_size, len, ext::uxtw, f);
289 andr(arr_size, arr_size, ~MinObjAlignmentInBytesMask);
290
291 try_allocate(obj, arr_size, 0, t1, t2, slow_case);
292
293 initialize_header(obj, klass, len, t1, t2);
294
295 // clear rest of allocated space
296 initialize_body(obj, arr_size, header_size * BytesPerWord, t1, t2);
297 if (Compilation::current()->bailed_out()) {
298 return;
299 }
300
301 membar(StoreStore);
302
303 if (CURRENT_ENV->dtrace_alloc_probes()) {
304 assert(obj == r0, "must be");
305 far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
306 }
307
308 verify_oop(obj);
309 }
310
311
312 void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) {
313 verify_oop(receiver);
314 // explicit null check not needed since load from [klass_offset] causes a trap
315 // check against inline cache
316 assert(!MacroAssembler::needs_explicit_null_check(oopDesc::klass_offset_in_bytes()), "must add explicit null check");
317
318 cmp_klass(receiver, iCache, rscratch1);
319 }
320
321
322 void C1_MacroAssembler::build_frame(int framesize, int bang_size_in_bytes) {
323 assert(bang_size_in_bytes >= framesize, "stack bang size incorrect");
324 // Make sure there is enough stack space for this method's activation.
325 // Note that we do this before creating a frame.
326 generate_stack_overflow_check(bang_size_in_bytes);
327 MacroAssembler::build_frame(framesize);
328
329 // Insert nmethod entry barrier into frame.
330 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
331 bs->nmethod_entry_barrier(this, nullptr /* slow_path */, nullptr /* continuation */, nullptr /* guard */);
332 }
333
334 void C1_MacroAssembler::remove_frame(int framesize) {
335 MacroAssembler::remove_frame(framesize);
336 }
337
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163 cmpxchgptr(disp_hdr, hdr, obj, rscratch2, done, &slow_case);
164 }
165 // done
166 bind(done);
167 }
168 decrement(Address(rthread, JavaThread::held_monitor_count_offset()));
169 }
170
171
172 // Defines obj, preserves var_size_in_bytes
173 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
174 if (UseTLAB) {
175 tlab_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
176 } else {
177 b(slow_case);
178 }
179 }
180
181 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
182 assert_different_registers(obj, klass, len);
183 if (UseCompactObjectHeaders) {
184 ldr(t1, Address(klass, Klass::prototype_header_offset()));
185 str(t1, Address(obj, oopDesc::mark_offset_in_bytes()));
186 } else {
187 // This assumes that all prototype bits fit in an int32_t
188 mov(t1, (int32_t)(intptr_t)markWord::prototype().value());
189 str(t1, Address(obj, oopDesc::mark_offset_in_bytes()));
190
191 if (UseCompressedClassPointers) { // Take care not to kill klass
192 encode_klass_not_null(t1, klass);
193 strw(t1, Address(obj, oopDesc::klass_offset_in_bytes()));
194 } else {
195 str(klass, Address(obj, oopDesc::klass_offset_in_bytes()));
196 }
197 }
198
199 if (len->is_valid()) {
200 strw(len, Address(obj, arrayOopDesc::length_offset_in_bytes()));
201 } else if (UseCompressedClassPointers && !UseCompactObjectHeaders) {
202 store_klass_gap(obj, zr);
203 }
204 }
205
206 // preserves obj, destroys len_in_bytes
207 //
208 // Scratch registers: t1 = r10, t2 = r11
209 //
210 void C1_MacroAssembler::initialize_body(Register obj, Register len_in_bytes, int hdr_size_in_bytes, Register t1, Register t2) {
211 assert(hdr_size_in_bytes >= 0, "header size must be positive or 0");
212 assert(t1 == r10 && t2 == r11, "must be");
213
214 Label done;
215
216 // len_in_bytes is positive and ptr sized
217 subs(len_in_bytes, len_in_bytes, hdr_size_in_bytes);
218 br(Assembler::EQ, done);
219
220 // zero_words() takes ptr in r10 and count in words in r11
221 mov(rscratch1, len_in_bytes);
259 } else if (con_size_in_bytes > hdr_size_in_bytes) {
260 con_size_in_bytes -= hdr_size_in_bytes;
261 lea(t1, Address(obj, hdr_size_in_bytes));
262 address tpc = zero_words(t1, con_size_in_bytes / BytesPerWord);
263 if (tpc == nullptr) {
264 Compilation::current()->bailout("no space for trampoline stub");
265 return;
266 }
267 }
268 }
269
270 membar(StoreStore);
271
272 if (CURRENT_ENV->dtrace_alloc_probes()) {
273 assert(obj == r0, "must be");
274 far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
275 }
276
277 verify_oop(obj);
278 }
279 void C1_MacroAssembler::allocate_array(Register obj, Register len, Register t1, Register t2, int base_offset_in_bytes, int f, Register klass, Label& slow_case) {
280 assert_different_registers(obj, len, t1, t2, klass);
281
282 // determine alignment mask
283 assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work");
284
285 // check for negative or excessive length
286 mov(rscratch1, (int32_t)max_array_allocation_length);
287 cmp(len, rscratch1);
288 br(Assembler::HS, slow_case);
289
290 const Register arr_size = t2; // okay to be the same
291 // align object end
292 mov(arr_size, (int32_t)base_offset_in_bytes + MinObjAlignmentInBytesMask);
293 add(arr_size, arr_size, len, ext::uxtw, f);
294 andr(arr_size, arr_size, ~MinObjAlignmentInBytesMask);
295
296 try_allocate(obj, arr_size, 0, t1, t2, slow_case);
297
298 initialize_header(obj, klass, len, t1, t2);
299
300 // Clear leading 4 bytes, if necessary.
301 // TODO: This could perhaps go into initialize_body() and also clear the leading 4 bytes
302 // for non-array objects, thereby replacing the klass-gap clearing code in initialize_header().
303 int base_offset = base_offset_in_bytes;
304 if (!is_aligned(base_offset, BytesPerWord)) {
305 assert(is_aligned(base_offset, BytesPerInt), "must be 4-byte aligned");
306 strw(zr, Address(obj, base_offset));
307 base_offset += BytesPerInt;
308 }
309 assert(is_aligned(base_offset, BytesPerWord), "must be word-aligned");
310
311 // clear rest of allocated space
312 initialize_body(obj, arr_size, base_offset, t1, t2);
313 if (Compilation::current()->bailed_out()) {
314 return;
315 }
316
317 membar(StoreStore);
318
319 if (CURRENT_ENV->dtrace_alloc_probes()) {
320 assert(obj == r0, "must be");
321 far_call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
322 }
323
324 verify_oop(obj);
325 }
326
327
328 void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) {
329 verify_oop(receiver);
330 // explicit null check not needed since load from [klass_offset] causes a trap
331 // check against inline cache. This is checked in Universe::genesis()..
332 cmp_klass(receiver, iCache, rscratch1);
333 }
334
335
336 void C1_MacroAssembler::build_frame(int framesize, int bang_size_in_bytes) {
337 assert(bang_size_in_bytes >= framesize, "stack bang size incorrect");
338 // Make sure there is enough stack space for this method's activation.
339 // Note that we do this before creating a frame.
340 generate_stack_overflow_check(bang_size_in_bytes);
341 MacroAssembler::build_frame(framesize);
342
343 // Insert nmethod entry barrier into frame.
344 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
345 bs->nmethod_entry_barrier(this, nullptr /* slow_path */, nullptr /* continuation */, nullptr /* guard */);
346 }
347
348 void C1_MacroAssembler::remove_frame(int framesize) {
349 MacroAssembler::remove_frame(framesize);
350 }
351
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