6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
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_MacroAssembler.hpp"
27 #include "c1/c1_Runtime1.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "gc/shared/collectedHeap.hpp"
30 #include "interpreter/interpreter.hpp"
31 #include "oops/arrayOop.hpp"
32 #include "oops/markOop.hpp"
33 #include "runtime/basicLock.hpp"
34 #include "runtime/biasedLocking.hpp"
35 #include "runtime/os.hpp"
36 #include "runtime/sharedRuntime.hpp"
37 #include "runtime/stubRoutines.hpp"
38
39 int C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, Register scratch, Label& slow_case) {
40 const int aligned_mask = BytesPerWord -1;
41 const int hdr_offset = oopDesc::mark_offset_in_bytes();
42 assert(hdr == rax, "hdr must be rax, for the cmpxchg instruction");
43 assert(hdr != obj && hdr != disp_hdr && obj != disp_hdr, "registers must be different");
44 Label done;
45 int null_check_offset = -1;
184 void C1_MacroAssembler::initialize_body(Register obj, Register len_in_bytes, int hdr_size_in_bytes, Register t1) {
185 assert(hdr_size_in_bytes >= 0, "header size must be positive or 0");
186 Label done;
187
188 // len_in_bytes is positive and ptr sized
189 subptr(len_in_bytes, hdr_size_in_bytes);
190 jcc(Assembler::zero, done);
191 zero_memory(obj, len_in_bytes, hdr_size_in_bytes, t1);
192 bind(done);
193 }
194
195
196 void C1_MacroAssembler::allocate_object(Register obj, Register t1, Register t2, int header_size, int object_size, Register klass, Label& slow_case) {
197 assert(obj == rax, "obj must be in rax, for cmpxchg");
198 assert_different_registers(obj, t1, t2); // XXX really?
199 assert(header_size >= 0 && object_size >= header_size, "illegal sizes");
200
201 try_allocate(obj, noreg, object_size * BytesPerWord, t1, t2, slow_case);
202
203 initialize_object(obj, klass, noreg, object_size * HeapWordSize, t1, t2, UseTLAB);
204 }
205
206 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) {
207 assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0,
208 "con_size_in_bytes is not multiple of alignment");
209 const int hdr_size_in_bytes = instanceOopDesc::header_size() * HeapWordSize;
210
211 initialize_header(obj, klass, noreg, t1, t2);
212
213 if (!(UseTLAB && ZeroTLAB && is_tlab_allocated)) {
214 // clear rest of allocated space
215 const Register t1_zero = t1;
216 const Register index = t2;
217 const int threshold = 6 * BytesPerWord; // approximate break even point for code size (see comments below)
218 if (var_size_in_bytes != noreg) {
219 mov(index, var_size_in_bytes);
220 initialize_body(obj, index, hdr_size_in_bytes, t1_zero);
221 } else if (con_size_in_bytes <= threshold) {
222 // use explicit null stores
223 // code size = 2 + 3*n bytes (n = number of fields to clear)
260
261 // determine alignment mask
262 assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work");
263
264 // check for negative or excessive length
265 cmpptr(len, (int32_t)max_array_allocation_length);
266 jcc(Assembler::above, slow_case);
267
268 const Register arr_size = t2; // okay to be the same
269 // align object end
270 movptr(arr_size, (int32_t)header_size * BytesPerWord + MinObjAlignmentInBytesMask);
271 lea(arr_size, Address(arr_size, len, f));
272 andptr(arr_size, ~MinObjAlignmentInBytesMask);
273
274 try_allocate(obj, arr_size, 0, t1, t2, slow_case);
275
276 initialize_header(obj, klass, len, t1, t2);
277
278 // clear rest of allocated space
279 const Register len_zero = len;
280 initialize_body(obj, arr_size, header_size * BytesPerWord, len_zero);
281
282 if (CURRENT_ENV->dtrace_alloc_probes()) {
283 assert(obj == rax, "must be");
284 call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
285 }
286
287 verify_oop(obj);
288 }
289
290
291
292 void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) {
293 verify_oop(receiver);
294 // explicit NULL check not needed since load from [klass_offset] causes a trap
295 // check against inline cache
296 assert(!MacroAssembler::needs_explicit_null_check(oopDesc::klass_offset_in_bytes()), "must add explicit null check");
297 int start_offset = offset();
298
299 if (UseCompressedClassPointers) {
300 load_klass(rscratch1, receiver);
301 cmpptr(rscratch1, iCache);
302 } else {
303 cmpptr(iCache, Address(receiver, oopDesc::klass_offset_in_bytes()));
304 }
305 // if icache check fails, then jump to runtime routine
306 // Note: RECEIVER must still contain the receiver!
|
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
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 "assembler_x86.hpp"
27 #include "c1/c1_MacroAssembler.hpp"
28 #include "c1/c1_Runtime1.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "gc/shared/collectedHeap.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "oops/arrayOop.hpp"
33 #include "oops/markOop.hpp"
34 #include "runtime/basicLock.hpp"
35 #include "runtime/biasedLocking.hpp"
36 #include "runtime/os.hpp"
37 #include "runtime/sharedRuntime.hpp"
38 #include "runtime/stubRoutines.hpp"
39
40 int C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, Register scratch, Label& slow_case) {
41 const int aligned_mask = BytesPerWord -1;
42 const int hdr_offset = oopDesc::mark_offset_in_bytes();
43 assert(hdr == rax, "hdr must be rax, for the cmpxchg instruction");
44 assert(hdr != obj && hdr != disp_hdr && obj != disp_hdr, "registers must be different");
45 Label done;
46 int null_check_offset = -1;
185 void C1_MacroAssembler::initialize_body(Register obj, Register len_in_bytes, int hdr_size_in_bytes, Register t1) {
186 assert(hdr_size_in_bytes >= 0, "header size must be positive or 0");
187 Label done;
188
189 // len_in_bytes is positive and ptr sized
190 subptr(len_in_bytes, hdr_size_in_bytes);
191 jcc(Assembler::zero, done);
192 zero_memory(obj, len_in_bytes, hdr_size_in_bytes, t1);
193 bind(done);
194 }
195
196
197 void C1_MacroAssembler::allocate_object(Register obj, Register t1, Register t2, int header_size, int object_size, Register klass, Label& slow_case) {
198 assert(obj == rax, "obj must be in rax, for cmpxchg");
199 assert_different_registers(obj, t1, t2); // XXX really?
200 assert(header_size >= 0 && object_size >= header_size, "illegal sizes");
201
202 try_allocate(obj, noreg, object_size * BytesPerWord, t1, t2, slow_case);
203
204 initialize_object(obj, klass, noreg, object_size * HeapWordSize, t1, t2, UseTLAB);
205
206 HEAP_MONITORING(this, noreg, noreg, object_size * HeapWordSize, obj,
207 t1, t2, call(RuntimeAddress(Runtime1::entry_for(
208 Runtime1::heap_object_sample_id))););
209 }
210
211 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) {
212 assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0,
213 "con_size_in_bytes is not multiple of alignment");
214 const int hdr_size_in_bytes = instanceOopDesc::header_size() * HeapWordSize;
215
216 initialize_header(obj, klass, noreg, t1, t2);
217
218 if (!(UseTLAB && ZeroTLAB && is_tlab_allocated)) {
219 // clear rest of allocated space
220 const Register t1_zero = t1;
221 const Register index = t2;
222 const int threshold = 6 * BytesPerWord; // approximate break even point for code size (see comments below)
223 if (var_size_in_bytes != noreg) {
224 mov(index, var_size_in_bytes);
225 initialize_body(obj, index, hdr_size_in_bytes, t1_zero);
226 } else if (con_size_in_bytes <= threshold) {
227 // use explicit null stores
228 // code size = 2 + 3*n bytes (n = number of fields to clear)
265
266 // determine alignment mask
267 assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work");
268
269 // check for negative or excessive length
270 cmpptr(len, (int32_t)max_array_allocation_length);
271 jcc(Assembler::above, slow_case);
272
273 const Register arr_size = t2; // okay to be the same
274 // align object end
275 movptr(arr_size, (int32_t)header_size * BytesPerWord + MinObjAlignmentInBytesMask);
276 lea(arr_size, Address(arr_size, len, f));
277 andptr(arr_size, ~MinObjAlignmentInBytesMask);
278
279 try_allocate(obj, arr_size, 0, t1, t2, slow_case);
280
281 initialize_header(obj, klass, len, t1, t2);
282
283 // clear rest of allocated space
284 const Register len_zero = len;
285 // Initialize body destroys arr_size so remember it.
286 push(arr_size);
287 initialize_body(obj, arr_size, header_size * BytesPerWord, len_zero);
288 pop(arr_size);
289
290 if (CURRENT_ENV->dtrace_alloc_probes()) {
291 assert(obj == rax, "must be");
292 call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id)));
293 }
294
295 HEAP_MONITORING(this, noreg, arr_size, 0, obj, t1, noreg,
296 call(RuntimeAddress(Runtime1::entry_for(
297 Runtime1::heap_object_sample_id))););
298 verify_oop(obj);
299 }
300
301
302
303 void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) {
304 verify_oop(receiver);
305 // explicit NULL check not needed since load from [klass_offset] causes a trap
306 // check against inline cache
307 assert(!MacroAssembler::needs_explicit_null_check(oopDesc::klass_offset_in_bytes()), "must add explicit null check");
308 int start_offset = offset();
309
310 if (UseCompressedClassPointers) {
311 load_klass(rscratch1, receiver);
312 cmpptr(rscratch1, iCache);
313 } else {
314 cmpptr(iCache, Address(receiver, oopDesc::klass_offset_in_bytes()));
315 }
316 // if icache check fails, then jump to runtime routine
317 // Note: RECEIVER must still contain the receiver!
|