1 /*
2 * Copyright (c) 2016, 2021, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
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 #include "precompiled.hpp"
26 #include "asm/macroAssembler.hpp"
27 #include "runtime/interfaceSupport.inline.hpp"
28 #include "runtime/sharedRuntime.hpp"
29 #include "utilities/globalDefinitions.hpp"
30 #include "vmreg_x86.inline.hpp"
31 #ifdef COMPILER1
32 #include "c1/c1_Runtime1.hpp"
33 #endif //COMPILER1
34
35 #define __ masm->
36
37 #ifdef COMPILER1
38 // ---------------------------------------------------------------------------
39 // Object.hashCode, System.identityHashCode can pull the hashCode from the
40 // header word instead of doing a full VM transition once it's been computed.
41 // Since hashCode is usually polymorphic at call sites we can't do this
42 // optimization at the call site without a lot of work.
43 void SharedRuntime::inline_check_hashcode_from_object_header(MacroAssembler* masm,
44 const methodHandle& method,
45 Register obj_reg,
46 Register result) {
47 Label slowCase;
48
49 // Unlike for Object.hashCode, System.identityHashCode is static method and
50 // gets object as argument instead of the receiver.
51 if (method->intrinsic_id() == vmIntrinsics::_identityHashCode) {
52 Label Continue;
53 // return 0 for null reference input
54 __ cmpptr(obj_reg, NULL_WORD);
55 __ jcc(Assembler::notEqual, Continue);
56 __ xorptr(result, result);
57 __ ret(0);
58 __ bind(Continue);
59 }
60
61 __ movptr(result, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
62
63
64 if (LockingMode == LM_LIGHTWEIGHT) {
65 // check if monitor
66 __ testptr(result, markWord::monitor_value);
67 __ jcc(Assembler::notZero, slowCase);
68 } else {
69 // check if locked
70 __ testptr(result, markWord::unlocked_value);
71 __ jcc(Assembler::zero, slowCase);
72 }
73
74 // get hash
75 #ifdef _LP64
76 // Read the header and build a mask to get its hash field.
77 // Depend on hash_mask being at most 32 bits and avoid the use of hash_mask_in_place
78 // because it could be larger than 32 bits in a 64-bit vm. See markWord.hpp.
79 if (UseCompactObjectHeaders) {
80 STATIC_ASSERT(markWord::hash_mask_compact < nth_bit(32));
81 __ shrptr(result, markWord::hash_shift_compact);
82 __ andptr(result, markWord::hash_mask_compact);
83 } else {
84 __ shrptr(result, markWord::hash_shift);
85 __ andptr(result, markWord::hash_mask);
86 }
87 #else
88 __ andptr(result, markWord::hash_mask_in_place);
89 #endif //_LP64
90
91 // test if hashCode exists
92 __ jcc(Assembler::zero, slowCase);
93 #ifndef _LP64
94 __ shrptr(result, markWord::hash_shift);
95 #endif
96 __ ret(0);
97 __ bind(slowCase);
98 }
99 #endif //COMPILER1
100
101 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
102 assert(StubRoutines::fmod() != nullptr, "");
103 jdouble (*addr)(jdouble, jdouble) = (double (*)(double, double))StubRoutines::fmod();
104 jdouble dx = (jdouble) x;
105 jdouble dy = (jdouble) y;
106
107 return (jfloat) (*addr)(dx, dy);
108 JRT_END
109
110 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
111 assert(StubRoutines::fmod() != nullptr, "");
112 jdouble (*addr)(jdouble, jdouble) = (double (*)(double, double))StubRoutines::fmod();
113
114 return (*addr)(x, y);
115 JRT_END