1 /* 2 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2018, SAP SE. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "asm/macroAssembler.inline.hpp" 28 #include "gc/shared/barrierSetAssembler.hpp" 29 #include "interpreter/interp_masm.hpp" 30 #include "oops/compressedOops.hpp" 31 #include "runtime/jniHandles.hpp" 32 33 #define __ masm-> 34 35 void BarrierSetAssembler::store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type, 36 Register base, RegisterOrConstant ind_or_offs, Register val, 37 Register tmp1, Register tmp2, Register tmp3, bool needs_frame) { 38 bool in_heap = (decorators & IN_HEAP) != 0; 39 bool in_native = (decorators & IN_NATIVE) != 0; 40 bool not_null = (decorators & IS_NOT_NULL) != 0; 41 assert(in_heap || in_native, "where?"); 42 assert_different_registers(base, val, tmp1, tmp2, R0); 43 44 switch (type) { 45 case T_ARRAY: 46 case T_OBJECT: { 47 if (UseCompressedOops && in_heap) { 48 Register co = tmp1; 49 if (val == noreg) { 50 __ li(co, 0); 51 } else { 52 co = not_null ? __ encode_heap_oop_not_null(tmp1, val) : __ encode_heap_oop(tmp1, val); 53 } 54 __ stw(co, ind_or_offs, base, tmp2); 55 } else { 56 if (val == noreg) { 57 val = tmp1; 58 __ li(val, 0); 59 } 60 __ std(val, ind_or_offs, base, tmp2); 61 } 62 break; 63 } 64 default: Unimplemented(); 65 } 66 } 67 68 void BarrierSetAssembler::load_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type, 69 Register base, RegisterOrConstant ind_or_offs, Register dst, 70 Register tmp1, Register tmp2, bool needs_frame, Label *L_handle_null) { 71 bool in_heap = (decorators & IN_HEAP) != 0; 72 bool in_native = (decorators & IN_NATIVE) != 0; 73 bool not_null = (decorators & IS_NOT_NULL) != 0; 74 assert(in_heap || in_native, "where?"); 75 assert_different_registers(ind_or_offs.register_or_noreg(), dst, R0); 76 77 switch (type) { 78 case T_ARRAY: 79 case T_OBJECT: { 80 if (UseCompressedOops && in_heap) { 81 if (L_handle_null != NULL) { // Label provided. 82 __ lwz(dst, ind_or_offs, base); 83 __ cmpwi(CCR0, dst, 0); 84 __ beq(CCR0, *L_handle_null); 85 __ decode_heap_oop_not_null(dst); 86 } else if (not_null) { // Guaranteed to be not null. 87 Register narrowOop = (tmp1 != noreg && CompressedOops::base_disjoint()) ? tmp1 : dst; 88 __ lwz(narrowOop, ind_or_offs, base); 89 __ decode_heap_oop_not_null(dst, narrowOop); 90 } else { // Any oop. 91 __ lwz(dst, ind_or_offs, base); 92 __ decode_heap_oop(dst); 93 } 94 } else { 95 __ ld(dst, ind_or_offs, base); 96 if (L_handle_null != NULL) { 97 __ cmpdi(CCR0, dst, 0); 98 __ beq(CCR0, *L_handle_null); 99 } 100 } 101 break; 102 } 103 default: Unimplemented(); 104 } 105 } 106 107 void BarrierSetAssembler::resolve_jobject(MacroAssembler* masm, Register value, 108 Register tmp1, Register tmp2, bool needs_frame) { 109 Label done; 110 __ cmpdi(CCR0, value, 0); 111 __ beq(CCR0, done); // Use NULL as-is. 112 113 __ clrrdi(tmp1, value, JNIHandles::weak_tag_size); 114 __ ld(value, 0, tmp1); // Resolve (untagged) jobject. 115 116 __ verify_oop(value, FILE_AND_LINE); 117 __ bind(done); 118 } 119 120 void BarrierSetAssembler::try_resolve_jobject_in_native(MacroAssembler* masm, Register dst, Register jni_env, 121 Register obj, Register tmp, Label& slowpath) { 122 __ clrrdi(dst, obj, JNIHandles::weak_tag_size); 123 __ ld(dst, 0, dst); // Resolve (untagged) jobject. 124 }