146 // we do unlocking via runtime call
147 jcc(Assembler::notEqual, slow_case);
148 // done
149 }
150 bind(done);
151 dec_held_monitor_count();
152 }
153
154
155 // Defines obj, preserves var_size_in_bytes
156 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
157 if (UseTLAB) {
158 tlab_allocate(noreg, obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
159 } else {
160 jmp(slow_case);
161 }
162 }
163
164
165 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
166 assert_different_registers(obj, klass, len);
167 movptr(Address(obj, oopDesc::mark_offset_in_bytes()), checked_cast<int32_t>(markWord::prototype().value()));
168 #ifdef _LP64
169 if (UseCompressedClassPointers) { // Take care not to kill klass
170 movptr(t1, klass);
171 encode_klass_not_null(t1, rscratch1);
172 movl(Address(obj, oopDesc::klass_offset_in_bytes()), t1);
173 } else
174 #endif
175 {
176 movptr(Address(obj, oopDesc::klass_offset_in_bytes()), klass);
177 }
178
179 if (len->is_valid()) {
180 movl(Address(obj, arrayOopDesc::length_offset_in_bytes()), len);
181 }
182 #ifdef _LP64
183 else if (UseCompressedClassPointers) {
184 xorptr(t1, t1);
185 store_klass_gap(obj, t1);
186 }
187 #endif
188 }
189
190
191 // preserves obj, destroys len_in_bytes
192 void C1_MacroAssembler::initialize_body(Register obj, Register len_in_bytes, int hdr_size_in_bytes, Register t1) {
193 assert(hdr_size_in_bytes >= 0, "header size must be positive or 0");
194 Label done;
195
196 // len_in_bytes is positive and ptr sized
197 subptr(len_in_bytes, hdr_size_in_bytes);
198 zero_memory(obj, len_in_bytes, hdr_size_in_bytes, t1);
199 bind(done);
200 }
201
202
203 void C1_MacroAssembler::allocate_object(Register obj, Register t1, Register t2, int header_size, int object_size, Register klass, Label& slow_case) {
204 assert(obj == rax, "obj must be in rax, for cmpxchg");
205 assert_different_registers(obj, t1, t2); // XXX really?
206 assert(header_size >= 0 && object_size >= header_size, "illegal sizes");
207
208 try_allocate(obj, noreg, object_size * BytesPerWord, t1, t2, slow_case);
209
210 initialize_object(obj, klass, noreg, object_size * HeapWordSize, t1, t2, UseTLAB);
211 }
212
213 void C1_MacroAssembler::initialize_object(Register obj, Register klass, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, bool is_tlab_allocated) {
214 assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0,
215 "con_size_in_bytes is not multiple of alignment");
216 const int hdr_size_in_bytes = instanceOopDesc::header_size() * HeapWordSize;
217
218 initialize_header(obj, klass, noreg, t1, t2);
219
220 if (!(UseTLAB && ZeroTLAB && is_tlab_allocated)) {
221 // clear rest of allocated space
222 const Register t1_zero = t1;
223 const Register index = t2;
224 const int threshold = 6 * BytesPerWord; // approximate break even point for code size (see comments below)
225 if (var_size_in_bytes != noreg) {
226 mov(index, var_size_in_bytes);
227 initialize_body(obj, index, hdr_size_in_bytes, t1_zero);
228 } else if (con_size_in_bytes <= threshold) {
229 // use explicit null stores
230 // code size = 2 + 3*n bytes (n = number of fields to clear)
231 xorptr(t1_zero, t1_zero); // use t1_zero reg to clear memory (shorter code)
232 for (int i = hdr_size_in_bytes; i < con_size_in_bytes; i += BytesPerWord)
233 movptr(Address(obj, i), t1_zero);
234 } else if (con_size_in_bytes > hdr_size_in_bytes) {
235 // use loop to null out the fields
236 // code size = 16 bytes for even n (n = number of fields to clear)
244 { Label loop;
245 bind(loop);
246 movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - (1*BytesPerWord)),
247 t1_zero);
248 NOT_LP64(movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - (2*BytesPerWord)),
249 t1_zero);)
250 decrement(index);
251 jcc(Assembler::notZero, loop);
252 }
253 }
254 }
255
256 if (CURRENT_ENV->dtrace_alloc_probes()) {
257 assert(obj == rax, "must be");
258 call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
259 }
260
261 verify_oop(obj);
262 }
263
264 void C1_MacroAssembler::allocate_array(Register obj, Register len, Register t1, Register t2, int header_size, Address::ScaleFactor f, Register klass, Label& slow_case) {
265 assert(obj == rax, "obj must be in rax, for cmpxchg");
266 assert_different_registers(obj, len, t1, t2, klass);
267
268 // determine alignment mask
269 assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work");
270
271 // check for negative or excessive length
272 cmpptr(len, checked_cast<int32_t>(max_array_allocation_length));
273 jcc(Assembler::above, slow_case);
274
275 const Register arr_size = t2; // okay to be the same
276 // align object end
277 movptr(arr_size, header_size * BytesPerWord + MinObjAlignmentInBytesMask);
278 lea(arr_size, Address(arr_size, len, f));
279 andptr(arr_size, ~MinObjAlignmentInBytesMask);
280
281 try_allocate(obj, arr_size, 0, t1, t2, slow_case);
282
283 initialize_header(obj, klass, len, t1, t2);
284
285 // clear rest of allocated space
286 const Register len_zero = len;
287 initialize_body(obj, arr_size, header_size * BytesPerWord, len_zero);
288
289 if (CURRENT_ENV->dtrace_alloc_probes()) {
290 assert(obj == rax, "must be");
291 call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
292 }
293
294 verify_oop(obj);
295 }
296
297
298
299 void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) {
300 verify_oop(receiver);
301 // explicit null check not needed since load from [klass_offset] causes a trap
302 // check against inline cache
303 assert(!MacroAssembler::needs_explicit_null_check(oopDesc::klass_offset_in_bytes()), "must add explicit null check");
304 int start_offset = offset();
305
306 if (UseCompressedClassPointers) {
307 load_klass(rscratch1, receiver, rscratch2);
308 cmpptr(rscratch1, iCache);
309 } else {
310 cmpptr(iCache, Address(receiver, oopDesc::klass_offset_in_bytes()));
311 }
312 // if icache check fails, then jump to runtime routine
313 // Note: RECEIVER must still contain the receiver!
314 jump_cc(Assembler::notEqual,
315 RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
316 const int ic_cmp_size = LP64_ONLY(10) NOT_LP64(9);
317 assert(UseCompressedClassPointers || offset() - start_offset == ic_cmp_size, "check alignment in emit_method_entry");
318 }
319
320
321 void C1_MacroAssembler::build_frame(int frame_size_in_bytes, int bang_size_in_bytes) {
322 assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");
323 // Make sure there is enough stack space for this method's activation.
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146 // we do unlocking via runtime call
147 jcc(Assembler::notEqual, slow_case);
148 // done
149 }
150 bind(done);
151 dec_held_monitor_count();
152 }
153
154
155 // Defines obj, preserves var_size_in_bytes
156 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) {
157 if (UseTLAB) {
158 tlab_allocate(noreg, obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case);
159 } else {
160 jmp(slow_case);
161 }
162 }
163
164
165 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
166 assert_different_registers(obj, klass, len, t1, t2);
167 #ifdef _LP64
168 if (UseCompactObjectHeaders) {
169 movptr(t1, Address(klass, Klass::prototype_header_offset()));
170 movptr(Address(obj, oopDesc::mark_offset_in_bytes()), t1);
171 } else if (UseCompressedClassPointers) { // Take care not to kill klass
172 movptr(Address(obj, oopDesc::mark_offset_in_bytes()), checked_cast<int32_t>(markWord::prototype().value()));
173 movptr(t1, klass);
174 encode_klass_not_null(t1, rscratch1);
175 movl(Address(obj, oopDesc::klass_offset_in_bytes()), t1);
176 } else
177 #endif
178 {
179 movptr(Address(obj, oopDesc::mark_offset_in_bytes()), checked_cast<int32_t>(markWord::prototype().value()));
180 movptr(Address(obj, oopDesc::klass_offset_in_bytes()), klass);
181 }
182
183 if (len->is_valid()) {
184 movl(Address(obj, arrayOopDesc::length_offset_in_bytes()), len);
185 }
186 #ifdef _LP64
187 else if (UseCompressedClassPointers && !UseCompactObjectHeaders) {
188 xorptr(t1, t1);
189 store_klass_gap(obj, t1);
190 }
191 #endif
192 }
193
194
195 // preserves obj, destroys len_in_bytes
196 void C1_MacroAssembler::initialize_body(Register obj, Register len_in_bytes, int hdr_size_in_bytes, Register t1) {
197 assert(hdr_size_in_bytes >= 0, "header size must be positive or 0");
198 Label done;
199
200 // len_in_bytes is positive and ptr sized
201 subptr(len_in_bytes, hdr_size_in_bytes);
202 zero_memory(obj, len_in_bytes, hdr_size_in_bytes, t1);
203 bind(done);
204 }
205
206
207 void C1_MacroAssembler::allocate_object(Register obj, Register t1, Register t2, int header_size, int object_size, Register klass, Label& slow_case) {
208 assert(obj == rax, "obj must be in rax, for cmpxchg");
209 assert_different_registers(obj, t1, t2); // XXX really?
210 assert(header_size >= 0 && object_size >= header_size, "illegal sizes");
211
212 try_allocate(obj, noreg, object_size * BytesPerWord, t1, t2, slow_case);
213
214 initialize_object(obj, klass, noreg, object_size * HeapWordSize, t1, t2, UseTLAB);
215 }
216
217 void C1_MacroAssembler::initialize_object(Register obj, Register klass, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, bool is_tlab_allocated) {
218 assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0,
219 "con_size_in_bytes is not multiple of alignment");
220 const int hdr_size_in_bytes = instanceOopDesc::header_size() * HeapWordSize;
221 assert(!UseCompactObjectHeaders || hdr_size_in_bytes == 8, "check object headers size");
222
223 initialize_header(obj, klass, noreg, t1, t2);
224
225 if (!(UseTLAB && ZeroTLAB && is_tlab_allocated)) {
226 // clear rest of allocated space
227 const Register t1_zero = t1;
228 const Register index = t2;
229 const int threshold = 6 * BytesPerWord; // approximate break even point for code size (see comments below)
230 if (var_size_in_bytes != noreg) {
231 mov(index, var_size_in_bytes);
232 initialize_body(obj, index, hdr_size_in_bytes, t1_zero);
233 } else if (con_size_in_bytes <= threshold) {
234 // use explicit null stores
235 // code size = 2 + 3*n bytes (n = number of fields to clear)
236 xorptr(t1_zero, t1_zero); // use t1_zero reg to clear memory (shorter code)
237 for (int i = hdr_size_in_bytes; i < con_size_in_bytes; i += BytesPerWord)
238 movptr(Address(obj, i), t1_zero);
239 } else if (con_size_in_bytes > hdr_size_in_bytes) {
240 // use loop to null out the fields
241 // code size = 16 bytes for even n (n = number of fields to clear)
249 { Label loop;
250 bind(loop);
251 movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - (1*BytesPerWord)),
252 t1_zero);
253 NOT_LP64(movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - (2*BytesPerWord)),
254 t1_zero);)
255 decrement(index);
256 jcc(Assembler::notZero, loop);
257 }
258 }
259 }
260
261 if (CURRENT_ENV->dtrace_alloc_probes()) {
262 assert(obj == rax, "must be");
263 call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
264 }
265
266 verify_oop(obj);
267 }
268
269 void C1_MacroAssembler::allocate_array(Register obj, Register len, Register t1, Register t2, int base_offset_in_bytes, Address::ScaleFactor f, Register klass, Label& slow_case) {
270 assert(obj == rax, "obj must be in rax, for cmpxchg");
271 assert_different_registers(obj, len, t1, t2, klass);
272
273 // determine alignment mask
274 assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work");
275
276 // check for negative or excessive length
277 cmpptr(len, checked_cast<int32_t>(max_array_allocation_length));
278 jcc(Assembler::above, slow_case);
279
280 const Register arr_size = t2; // okay to be the same
281 // align object end
282 movptr(arr_size, base_offset_in_bytes + MinObjAlignmentInBytesMask);
283 lea(arr_size, Address(arr_size, len, f));
284 andptr(arr_size, ~MinObjAlignmentInBytesMask);
285
286 try_allocate(obj, arr_size, 0, t1, t2, slow_case);
287
288 initialize_header(obj, klass, len, t1, t2);
289
290 // Clear leading 4 bytes, if necessary.
291 // TODO: This could perhaps go into initialize_body() and also clear the leading 4 bytes
292 // for non-array objects, thereby replacing the klass-gap clearing code in initialize_header().
293 int base_offset = base_offset_in_bytes;
294 #ifdef _LP64
295 if (!is_aligned(base_offset, BytesPerWord)) {
296 assert(is_aligned(base_offset, BytesPerInt), "must be 4-byte aligned");
297 movl(Address(obj, base_offset), 0);
298 base_offset += BytesPerInt;
299 }
300 #endif
301 assert(is_aligned(base_offset, BytesPerWord), "must be word aligned");
302
303 // clear rest of allocated space
304 const Register len_zero = len;
305 initialize_body(obj, arr_size, base_offset, len_zero);
306
307 if (CURRENT_ENV->dtrace_alloc_probes()) {
308 assert(obj == rax, "must be");
309 call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
310 }
311
312 verify_oop(obj);
313 }
314
315
316
317 void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) {
318 verify_oop(receiver);
319 // explicit null check not needed since load from [klass_offset] causes a trap
320 // check against inline cache. This is checked in Universe::genesis().
321 int start_offset = offset();
322
323 if (UseCompressedClassPointers) {
324 load_klass(rscratch1, receiver, rscratch2);
325 cmpptr(rscratch1, iCache);
326 } else {
327 cmpptr(iCache, Address(receiver, oopDesc::klass_offset_in_bytes()));
328 }
329 // if icache check fails, then jump to runtime routine
330 // Note: RECEIVER must still contain the receiver!
331 jump_cc(Assembler::notEqual,
332 RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
333 const int ic_cmp_size = LP64_ONLY(10) NOT_LP64(9);
334 assert(UseCompressedClassPointers || offset() - start_offset == ic_cmp_size, "check alignment in emit_method_entry");
335 }
336
337
338 void C1_MacroAssembler::build_frame(int frame_size_in_bytes, int bang_size_in_bytes) {
339 assert(bang_size_in_bytes >= frame_size_in_bytes, "stack bang size incorrect");
340 // Make sure there is enough stack space for this method's activation.
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