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/g1BarrierSetCodeGen.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 G1BarrierSetCodeGen::gen_write_ref_array_pre_barrier(MacroAssembler* masm, DecoratorSet decorators, Register addr, Register count) { 40 bool dest_uninitialized = (decorators & AS_DEST_NOT_INITIALIZED) != 0; 41 42 if (!dest_uninitialized) { 43 Register thread = NOT_LP64(rax) LP64_ONLY(r15_thread); 44 #ifndef _LP64 45 __ push(thread); 46 __ get_thread(thread); 47 #endif 48 49 Label filtered; 50 Address in_progress(thread, in_bytes(JavaThread::satb_mark_queue_offset() + 51 SATBMarkQueue::byte_offset_of_active())); 52 // Is marking active? 53 if (in_bytes(SATBMarkQueue::byte_width_of_active()) == 4) { 54 __ cmpl(in_progress, 0); 55 } else { 56 assert(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1, "Assumption"); 57 __ cmpb(in_progress, 0); 58 } 59 60 NOT_LP64(__ pop(thread);) 61 62 __ jcc(Assembler::equal, filtered); 63 64 __ pusha(); // push registers 65 #ifdef _LP64 66 if (count == c_rarg0) { 67 if (addr == c_rarg1) { 68 // exactly backwards!! 69 __ xchgptr(c_rarg1, c_rarg0); 70 } else { 71 __ movptr(c_rarg1, count); 72 __ movptr(c_rarg0, addr); 73 } 74 } else { 75 __ movptr(c_rarg0, addr); 76 __ movptr(c_rarg1, count); 77 } 78 if (UseCompressedOops) { 79 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_pre_narrow_oop_entry), 2); 80 } else { 81 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_pre_oop_entry), 2); 82 } 83 #else 84 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_pre_oop_entry), 85 addr, count); 86 #endif 87 __ popa(); 88 89 __ bind(filtered); 90 } 91 } 92 93 void G1BarrierSetCodeGen::gen_write_ref_array_post_barrier(MacroAssembler* masm, DecoratorSet decorators, Register addr, Register count, Register tmp) { 94 __ pusha(); // push registers (overkill) 95 #ifdef _LP64 96 if (c_rarg0 == count) { // On win64 c_rarg0 == rcx 97 assert_different_registers(c_rarg1, addr); 98 __ mov(c_rarg1, count); 99 __ mov(c_rarg0, addr); 100 } else { 101 assert_different_registers(c_rarg0, count); 102 __ mov(c_rarg0, addr); 103 __ mov(c_rarg1, count); 104 } 105 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_post_entry), 2); 106 #else 107 __ call_VM_leaf(CAST_FROM_FN_PTR(address, G1BarrierSet::write_ref_array_post_entry), 108 addr, count); 109 #endif 110 __ popa(); 111 }