1 /* 2 * Copyright (c) 2016, 2025, 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 "asm/macroAssembler.hpp" 26 #include "runtime/interfaceSupport.inline.hpp" 27 #include "runtime/sharedRuntime.hpp" 28 #include "utilities/globalDefinitions.hpp" 29 #include "vmreg_x86.inline.hpp" 30 #ifdef COMPILER1 31 #include "c1/c1_Runtime1.hpp" 32 #endif //COMPILER1 33 34 #define __ masm-> 35 36 #ifdef COMPILER1 37 // --------------------------------------------------------------------------- 38 // Object.hashCode, System.identityHashCode can pull the hashCode from the 39 // header word instead of doing a full VM transition once it's been computed. 40 // Since hashCode is usually polymorphic at call sites we can't do this 41 // optimization at the call site without a lot of work. 42 void SharedRuntime::inline_check_hashcode_from_object_header(MacroAssembler* masm, 43 const methodHandle& method, 44 Register obj_reg, 45 Register result) { 46 Label slowCase; 47 48 // Unlike for Object.hashCode, System.identityHashCode is static method and 49 // gets object as argument instead of the receiver. 50 if (method->intrinsic_id() == vmIntrinsics::_identityHashCode) { 51 Label Continue; 52 // return 0 for null reference input 53 __ cmpptr(obj_reg, NULL_WORD); 54 __ jcc(Assembler::notEqual, Continue); 55 __ xorptr(result, result); 56 __ ret(0); 57 __ bind(Continue); 58 } 59 60 if (UseCompactObjectHeaders) { 61 // Don't generate anything else and always take the slow-path for now. 62 return; 63 } 64 65 __ movptr(result, Address(obj_reg, oopDesc::mark_offset_in_bytes())); 66 67 68 if (LockingMode == LM_LIGHTWEIGHT) { 69 if (!UseObjectMonitorTable) { 70 // check if monitor 71 __ testptr(result, markWord::monitor_value); 72 __ jcc(Assembler::notZero, slowCase); 73 } 74 } else { 75 // check if locked 76 __ testptr(result, markWord::unlocked_value); 77 __ jcc(Assembler::zero, slowCase); 78 } 79 80 // get hash 81 #ifdef _LP64 82 // Read the header and build a mask to get its hash field. 83 // Depend on hash_mask being at most 32 bits and avoid the use of hash_mask_in_place 84 // because it could be larger than 32 bits in a 64-bit vm. See markWord.hpp. 85 __ shrptr(result, markWord::hash_shift); 86 __ andptr(result, markWord::hash_mask); 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