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 "asm/macroAssembler.inline.hpp" 27 #include "gc/g1/g1BarrierSet.hpp" 28 #include "gc/g1/g1BarrierSetAssembler.hpp" 29 #include "gc/g1/g1CardTable.hpp" 30 #include "gc/g1/heapRegion.hpp" 31 #include "gc/shared/collectedHeap.hpp" 32 #include "interpreter/interp_masm.hpp" 33 #include "runtime/sharedRuntime.hpp" 34 #include "runtime/thread.hpp" 35 #include "utilities/macros.hpp" 36 37 #define __ masm-> 38 39 void G1BarrierSetAssembler::gen_write_ref_array_pre_barrier(MacroAssembler* masm, DecoratorSet decorators, 40 Register addr, Register count) { 41 bool dest_uninitialized = (decorators & AS_DEST_NOT_INITIALIZED) != 0; 42 43 if (!dest_uninitialized) { 44 Register thread = NOT_LP64(rax) LP64_ONLY(r15_thread); 45 #ifndef _LP64 46 __ push(thread); 47 __ get_thread(thread); 48 #endif 49 50 Label filtered; 51 Address in_progress(thread, in_bytes(JavaThread::satb_mark_queue_offset() + 52 SATBMarkQueue::byte_offset_of_active())); 53 // Is marking active? 54 if (in_bytes(SATBMarkQueue::byte_width_of_active()) == 4) { 55 __ cmpl(in_progress, 0); 56 } else { 57 assert(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1, "Assumption"); 58 __ cmpb(in_progress, 0); 59 } 60 61 NOT_LP64(__ pop(thread);) 62 63 __ jcc(Assembler::equal, filtered); 64 65 __ pusha(); // push registers 66 #ifdef _LP64 67 if (count == c_rarg0) { 68 if (addr == c_rarg1) { 69 // exactly backwards!! 70 __ xchgptr(c_rarg1, c_rarg0); 71 } else { 72 __ movptr(c_rarg1, count); 73 __ movptr(c_rarg0, addr); 74 } 75 } else { 76 __ movptr(c_rarg0, addr); 77 __ movptr(c_rarg1, count); 78 } 79 if (UseCompressedOops) { 80 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_pre_narrow_oop_entry), 2); 81 } else { 82 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_pre_oop_entry), 2); 83 } 84 #else 85 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_pre_oop_entry), 86 addr, count); 87 #endif 88 __ popa(); 89 90 __ bind(filtered); 91 } 92 } 93 94 void G1BarrierSetAssembler::gen_write_ref_array_post_barrier(MacroAssembler* masm, DecoratorSet decorators, 95 Register addr, Register count, Register tmp) { 96 __ pusha(); // push registers (overkill) 97 #ifdef _LP64 98 if (c_rarg0 == count) { // On win64 c_rarg0 == rcx 99 assert_different_registers(c_rarg1, addr); 100 __ mov(c_rarg1, count); 101 __ mov(c_rarg0, addr); 102 } else { 103 assert_different_registers(c_rarg0, count); 104 __ mov(c_rarg0, addr); 105 __ mov(c_rarg1, count); 106 } 107 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_post_entry), 2); 108 #else 109 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_post_entry), 110 addr, count); 111 #endif 112 __ popa(); 113 }