1 /* 2 * Copyright (c) 2015, Red Hat, Inc. and/or its affiliates. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 #include "precompiled.hpp" 25 #include "gc_implementation/shenandoah/brooksPointer.hpp" 26 #include "gc_implementation/shenandoah/shenandoahBarrierSet.inline.hpp" 27 28 #include "asm/macroAssembler.hpp" 29 #include "interpreter/interpreter.hpp" 30 31 #define __ masm-> 32 33 #ifndef CC_INTERP 34 35 void ShenandoahBarrierSet::interpreter_read_barrier(MacroAssembler* masm, Register dst) { 36 if (ShenandoahReadBarrier) { 37 38 Label is_null; 39 __ testptr(dst, dst); 40 __ jcc(Assembler::zero, is_null); 41 interpreter_read_barrier_not_null(masm, dst); 42 __ bind(is_null); 43 } 44 } 45 46 void ShenandoahBarrierSet::interpreter_read_barrier_not_null(MacroAssembler* masm, Register dst) { 47 if (ShenandoahReadBarrier) { 48 __ movptr(dst, Address(dst, BrooksPointer::byte_offset())); 49 } 50 } 51 52 void ShenandoahBarrierSet::interpreter_write_barrier(MacroAssembler* masm, Register dst) { 53 54 if (! ShenandoahWriteBarrier) { 55 return interpreter_read_barrier(masm, dst); 56 } 57 58 #ifdef _LP64 59 assert(dst != rscratch1, "different regs"); 60 61 Label done; 62 63 Address gc_state(r15_thread, in_bytes(JavaThread::gc_state_offset())); 64 65 // Now check if evacuation is in progress. 66 __ testb(gc_state, ShenandoahHeap::HAS_FORWARDED | ShenandoahHeap::EVACUATION); 67 __ jcc(Assembler::zero, done); 68 69 // Heap is unstable, need to perform the read-barrier even if WB is inactive 70 interpreter_read_barrier_not_null(masm, dst); 71 72 __ testb(gc_state, ShenandoahHeap::EVACUATION); 73 __ jcc(Assembler::zero, done); 74 __ push(rscratch1); 75 __ push(rscratch2); 76 77 __ movptr(rscratch1, dst); 78 __ shrptr(rscratch1, ShenandoahHeapRegion::region_size_bytes_shift_jint()); 79 __ movptr(rscratch2, (intptr_t) ShenandoahHeap::in_cset_fast_test_addr()); 80 __ movbool(rscratch2, Address(rscratch2, rscratch1, Address::times_1)); 81 __ testb(rscratch2, 0x1); 82 83 __ pop(rscratch2); 84 __ pop(rscratch1); 85 86 __ jcc(Assembler::zero, done); 87 88 __ push(rscratch1); 89 90 // Save possibly live regs. 91 if (dst != rax) { 92 __ push(rax); 93 } 94 if (dst != rbx) { 95 __ push(rbx); 96 } 97 if (dst != rcx) { 98 __ push(rcx); 99 } 100 if (dst != rdx) { 101 __ push(rdx); 102 } 103 if (dst != c_rarg1) { 104 __ push(c_rarg1); 105 } 106 107 __ subptr(rsp, 2 * wordSize); 108 __ movdbl(Address(rsp, 0), xmm0); 109 110 // Call into runtime 111 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, ShenandoahBarrierSet::write_barrier_IRT), dst); 112 __ mov(rscratch1, rax); 113 114 // Restore possibly live regs. 115 __ movdbl(xmm0, Address(rsp, 0)); 116 __ addptr(rsp, 2 * Interpreter::stackElementSize); 117 118 if (dst != c_rarg1) { 119 __ pop(c_rarg1); 120 } 121 if (dst != rdx) { 122 __ pop(rdx); 123 } 124 if (dst != rcx) { 125 __ pop(rcx); 126 } 127 if (dst != rbx) { 128 __ pop(rbx); 129 } 130 if (dst != rax) { 131 __ pop(rax); 132 } 133 134 // Move result into dst reg. 135 __ mov(dst, rscratch1); 136 137 __ pop(rscratch1); 138 139 __ bind(done); 140 #else 141 Unimplemented(); 142 #endif 143 } 144 145 void ShenandoahBarrierSet::asm_acmp_barrier(MacroAssembler* masm, Register op1, Register op2) { 146 assert (UseShenandoahGC, "Should be enabled"); 147 if (ShenandoahAcmpBarrier) { 148 Label done; 149 __ jccb(Assembler::equal, done); 150 interpreter_read_barrier(masm, op1); 151 interpreter_read_barrier(masm, op2); 152 __ cmpptr(op1, op2); 153 __ bind(done); 154 } 155 } 156 157 void ShenandoahHeap::compile_prepare_oop(MacroAssembler* masm, Register obj) { 158 #ifdef _LP64 159 __ incrementq(obj, BrooksPointer::byte_size()); 160 #else 161 __ incrementl(obj, BrooksPointer::byte_size()); 162 #endif 163 __ movptr(Address(obj, BrooksPointer::byte_offset()), obj); 164 } 165 #endif