22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "asm/macroAssembler.hpp"
27 #include "runtime/sharedRuntime.hpp"
28 #include "vmreg_x86.inline.hpp"
29 #ifdef COMPILER1
30 #include "c1/c1_Runtime1.hpp"
31 #endif //COMPILER1
32
33 #define __ masm->
34
35 #ifdef COMPILER1
36 // ---------------------------------------------------------------------------
37 // Object.hashCode, System.identityHashCode can pull the hashCode from the
38 // header word instead of doing a full VM transition once it's been computed.
39 // Since hashCode is usually polymorphic at call sites we can't do this
40 // optimization at the call site without a lot of work.
41 void SharedRuntime::inline_check_hashcode_from_object_header(MacroAssembler* masm,
42 methodHandle method,
43 Register obj_reg,
44 Register result) {
45 Label slowCase;
46
47 // Unlike for Object.hashCode, System.identityHashCode is static method and
48 // gets object as argument instead of the receiver.
49 if (method->intrinsic_id() == vmIntrinsics::_identityHashCode) {
50 Label Continue;
51 // return 0 for null reference input
52 __ cmpptr(obj_reg, (int32_t)NULL_WORD);
53 __ jcc(Assembler::notEqual, Continue);
54 __ xorptr(result, result);
55 __ ret(0);
56 __ bind(Continue);
57 }
58
59 __ movptr(result, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
60
61 // check if locked
62 __ testptr(result, markOopDesc::unlocked_value);
|
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "asm/macroAssembler.hpp"
27 #include "runtime/sharedRuntime.hpp"
28 #include "vmreg_x86.inline.hpp"
29 #ifdef COMPILER1
30 #include "c1/c1_Runtime1.hpp"
31 #endif //COMPILER1
32
33 #define __ masm->
34
35 #ifdef COMPILER1
36 // ---------------------------------------------------------------------------
37 // Object.hashCode, System.identityHashCode can pull the hashCode from the
38 // header word instead of doing a full VM transition once it's been computed.
39 // Since hashCode is usually polymorphic at call sites we can't do this
40 // optimization at the call site without a lot of work.
41 void SharedRuntime::inline_check_hashcode_from_object_header(MacroAssembler* masm,
42 const methodHandle& method,
43 Register obj_reg,
44 Register result) {
45 Label slowCase;
46
47 // Unlike for Object.hashCode, System.identityHashCode is static method and
48 // gets object as argument instead of the receiver.
49 if (method->intrinsic_id() == vmIntrinsics::_identityHashCode) {
50 Label Continue;
51 // return 0 for null reference input
52 __ cmpptr(obj_reg, (int32_t)NULL_WORD);
53 __ jcc(Assembler::notEqual, Continue);
54 __ xorptr(result, result);
55 __ ret(0);
56 __ bind(Continue);
57 }
58
59 __ movptr(result, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
60
61 // check if locked
62 __ testptr(result, markOopDesc::unlocked_value);
|