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_ROOT) != 0; 38 switch (type) { 39 case T_OBJECT: 40 case T_ARRAY: { 41 if (on_heap) { 42 __ load_heap_oop(dst, src); 43 } else { 44 assert(on_root, "why else?"); 45 __ ldr(dst, src); 46 } 47 break; 48 } 49 default: Unimplemented(); 50 } 51 } 52 53 void BarrierSetAssembler::store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type, 54 Address dst, Register val, Register tmp1, Register tmp2) { 55 bool on_heap = (decorators & IN_HEAP) != 0; 56 bool on_root = (decorators & IN_ROOT) != 0; 57 switch (type) { 58 case T_OBJECT: 59 case T_ARRAY: { 60 if (on_heap) { 61 __ store_heap_oop(dst, val); 62 } else { 63 assert(on_root, "why else?"); 64 __ str(val, dst); 65 } 66 break; 67 } 68 default: Unimplemented(); 69 } 70 } 71 72 void BarrierSetAssembler::try_resolve_jobject_in_native(MacroAssembler* masm, Register jni_env, 73 Register obj, Register tmp, Label& slowpath) { 74 // If mask changes we need to ensure that the inverse is still encodable as an immediate 75 STATIC_ASSERT(JNIHandles::weak_tag_mask == 1); 76 __ andr(obj, obj, ~JNIHandles::weak_tag_mask); 77 __ ldr(obj, Address(obj, 0)); // *obj 78 }