5 * This code is free software; you can redistribute it and/or modify it
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 class BytecodeStream;
26
27 // The MethodData object collects counts and other profile information
28 // during zeroth-tier (interpretive) and first-tier execution.
29 // The profile is used later by compilation heuristics. Some heuristics
30 // enable use of aggressive (or "heroic") optimizations. An aggressive
31 // optimization often has a down-side, a corner case that it handles
32 // poorly, but which is thought to be rare. The profile provides
33 // evidence of this rarity for a given method or even BCI. It allows
34 // the compiler to back out of the optimization at places where it
35 // has historically been a poor choice. Other heuristics try to use
36 // specific information gathered about types observed at a given site.
37 //
38 // All data in the profile is approximate. It is expected to be accurate
39 // on the whole, but the system expects occasional inaccuraces, due to
40 // counter overflow, multiprocessor races during data collection, space
41 // limitations, missing MDO blocks, etc. Bad or missing data will degrade
42 // optimization quality but will not affect correctness. Also, each MDO
43 // is marked with its birth-date ("creation_mileage") which can be used
44 // to assess the quality ("maturity") of its data.
1473 static ByteSize invocation_counter_offset() {
1474 return byte_offset_of(methodDataOopDesc, _invocation_counter);
1475 }
1476 static ByteSize backedge_counter_offset() {
1477 return byte_offset_of(methodDataOopDesc, _backedge_counter);
1478 }
1479
1480 // GC support
1481 oop* adr_method() const { return (oop*)&_method; }
1482 bool object_is_parsable() const { return _size != 0; }
1483 void set_object_is_parsable(int object_size_in_bytes) { _size = object_size_in_bytes; }
1484
1485 #ifndef PRODUCT
1486 // printing support for method data
1487 void print_data_on(outputStream* st);
1488 #endif
1489
1490 // verification
1491 void verify_data_on(outputStream* st);
1492 };
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5 * This code is free software; you can redistribute it and/or modify it
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 #ifndef SHARE_VM_OOPS_METHODDATAOOP_HPP
26 #define SHARE_VM_OOPS_METHODDATAOOP_HPP
27
28 #include "interpreter/bytecodes.hpp"
29 #include "memory/universe.hpp"
30 #include "oops/methodOop.hpp"
31 #include "oops/oop.hpp"
32 #include "runtime/orderAccess.hpp"
33
34 class BytecodeStream;
35
36 // The MethodData object collects counts and other profile information
37 // during zeroth-tier (interpretive) and first-tier execution.
38 // The profile is used later by compilation heuristics. Some heuristics
39 // enable use of aggressive (or "heroic") optimizations. An aggressive
40 // optimization often has a down-side, a corner case that it handles
41 // poorly, but which is thought to be rare. The profile provides
42 // evidence of this rarity for a given method or even BCI. It allows
43 // the compiler to back out of the optimization at places where it
44 // has historically been a poor choice. Other heuristics try to use
45 // specific information gathered about types observed at a given site.
46 //
47 // All data in the profile is approximate. It is expected to be accurate
48 // on the whole, but the system expects occasional inaccuraces, due to
49 // counter overflow, multiprocessor races during data collection, space
50 // limitations, missing MDO blocks, etc. Bad or missing data will degrade
51 // optimization quality but will not affect correctness. Also, each MDO
52 // is marked with its birth-date ("creation_mileage") which can be used
53 // to assess the quality ("maturity") of its data.
1482 static ByteSize invocation_counter_offset() {
1483 return byte_offset_of(methodDataOopDesc, _invocation_counter);
1484 }
1485 static ByteSize backedge_counter_offset() {
1486 return byte_offset_of(methodDataOopDesc, _backedge_counter);
1487 }
1488
1489 // GC support
1490 oop* adr_method() const { return (oop*)&_method; }
1491 bool object_is_parsable() const { return _size != 0; }
1492 void set_object_is_parsable(int object_size_in_bytes) { _size = object_size_in_bytes; }
1493
1494 #ifndef PRODUCT
1495 // printing support for method data
1496 void print_data_on(outputStream* st);
1497 #endif
1498
1499 // verification
1500 void verify_data_on(outputStream* st);
1501 };
1502
1503 #endif // SHARE_VM_OOPS_METHODDATAOOP_HPP
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