1 /* 2 * Copyright (c) 2018, 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 "gc/shared/barrierSetAssembler.hpp" 27 #include "runtime/jniHandles.hpp" 28 29 #define __ masm-> 30 31 void BarrierSetAssembler::load_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type, 32 Register dst, Address src, Register tmp1, Register tmp_thread) { 33 34 // LR is live. It must be saved around calls. 35 36 bool on_heap = (decorators & IN_HEAP) != 0; 37 bool on_root = (decorators & IN_NATIVE) != 0; 38 bool oop_not_null = (decorators & OOP_NOT_NULL) != 0; 39 switch (type) { 40 case T_OBJECT: 41 case T_ARRAY: { 42 if (on_heap) { 43 if (UseCompressedOops) { 44 __ ldrw(dst, src); 45 if (oop_not_null) { 46 __ decode_heap_oop_not_null(dst); 47 } else { 48 __ decode_heap_oop(dst); 49 } 50 } else { 51 __ ldr(dst, src); 52 } 53 } else { 54 assert(on_root, "why else?"); 55 __ ldr(dst, src); 56 } 57 break; 58 } 59 case T_BOOLEAN: __ load_unsigned_byte (dst, src); break; 60 case T_BYTE: __ load_signed_byte (dst, src); break; 61 case T_CHAR: __ load_unsigned_short(dst, src); break; 62 case T_SHORT: __ load_signed_short (dst, src); break; 63 case T_INT: __ ldrw (dst, src); break; 64 case T_LONG: __ ldr (dst, src); break; 65 case T_ADDRESS: __ ldr (dst, src); break; 66 case T_FLOAT: __ ldrs (v0, src); break; 67 case T_DOUBLE: __ ldrd (v0, src); break; 68 default: Unimplemented(); 69 } 70 } 71 72 void BarrierSetAssembler::store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type, 73 Address dst, Register val, Register tmp1, Register tmp2) { 74 bool on_heap = (decorators & IN_HEAP) != 0; 75 bool on_root = (decorators & IN_NATIVE) != 0; 76 switch (type) { 77 case T_OBJECT: 78 case T_ARRAY: { 79 val = val == noreg ? zr : val; 80 if (on_heap) { 81 if (UseCompressedOops) { 82 assert(!dst.uses(val), "not enough registers"); 83 if (val != zr) { 84 __ encode_heap_oop(val); 85 } 86 __ strw(val, dst); 87 } else { 88 __ str(val, dst); 89 } 90 } else { 91 assert(on_root, "why else?"); 92 __ str(val, dst); 93 } 94 break; 95 } 96 case T_BOOLEAN: 97 __ andw(val, val, 0x1); // boolean is true if LSB is 1 98 __ strb(val, dst); 99 break; 100 case T_BYTE: __ strb(val, dst); break; 101 case T_CHAR: __ strh(val, dst); break; 102 case T_SHORT: __ strh(val, dst); break; 103 case T_INT: __ strw(val, dst); break; 104 case T_LONG: __ str (val, dst); break; 105 case T_ADDRESS: __ str (val, dst); break; 106 case T_FLOAT: __ strs(v0, dst); break; 107 case T_DOUBLE: __ strd(v0, dst); break; 108 default: Unimplemented(); 109 } 110 } 111 112 void BarrierSetAssembler::try_resolve_jobject_in_native(MacroAssembler* masm, Register jni_env, 113 Register obj, Register tmp, Label& slowpath) { 114 // If mask changes we need to ensure that the inverse is still encodable as an immediate 115 STATIC_ASSERT(JNIHandles::weak_tag_mask == 1); 116 __ andr(obj, obj, ~JNIHandles::weak_tag_mask); 117 __ ldr(obj, Address(obj, 0)); // *obj 118 }