1 /* 2 * Copyright (c) 2015, 2015, 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 package org.graalvm.compiler.hotspot.amd64; 24 25 import static org.graalvm.compiler.lir.LIRValueUtil.asJavaConstant; 26 import static org.graalvm.compiler.lir.LIRValueUtil.isJavaConstant; 27 import static jdk.vm.ci.amd64.AMD64.rax; 28 import static jdk.vm.ci.amd64.AMD64.rbx; 29 import static jdk.vm.ci.code.ValueUtil.asRegister; 30 import static jdk.vm.ci.code.ValueUtil.isRegister; 31 32 import org.graalvm.compiler.asm.amd64.AMD64Address; 33 import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler; 34 import org.graalvm.compiler.debug.GraalError; 35 import org.graalvm.compiler.hotspot.HotSpotCounterOp; 36 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig; 37 import org.graalvm.compiler.hotspot.meta.HotSpotRegistersProvider; 38 import org.graalvm.compiler.lir.LIRInstructionClass; 39 import org.graalvm.compiler.lir.Opcode; 40 import org.graalvm.compiler.lir.asm.CompilationResultBuilder; 41 42 import jdk.vm.ci.code.Register; 43 import jdk.vm.ci.code.TargetDescription; 44 import jdk.vm.ci.meta.AllocatableValue; 45 import jdk.vm.ci.meta.Value; 46 47 @Opcode("BenchMarkCounter") 48 public class AMD64HotSpotCounterOp extends HotSpotCounterOp { 49 public static final LIRInstructionClass<AMD64HotSpotCounterOp> TYPE = LIRInstructionClass.create(AMD64HotSpotCounterOp.class); 50 51 @Alive({OperandFlag.STACK, OperandFlag.UNINITIALIZED}) private AllocatableValue backupSlot; 52 53 public AMD64HotSpotCounterOp(String name, String group, Value increment, HotSpotRegistersProvider registers, GraalHotSpotVMConfig config, AllocatableValue backupSlot) { 54 super(TYPE, name, group, increment, registers, config); 55 this.backupSlot = backupSlot; 56 } 57 58 public AMD64HotSpotCounterOp(String[] names, String[] groups, Value[] increments, HotSpotRegistersProvider registers, GraalHotSpotVMConfig config, AllocatableValue backupSlot) { 59 super(TYPE, names, groups, increments, registers, config); 60 this.backupSlot = backupSlot; 61 } 62 63 @Override 64 public void emitCode(CompilationResultBuilder crb) { 65 AMD64MacroAssembler masm = (AMD64MacroAssembler) crb.asm; 66 TargetDescription target = crb.target; 67 68 Register scratch; 69 // It can happen that the rax register is the increment register, in this case we do not 70 // want to spill it to the stack. 71 if (!contains(increments, rax)) { 72 scratch = rax; 73 } else if (!contains(increments, rbx)) { 74 scratch = rbx; 75 } else { 76 // In this case rax and rbx are used as increment. Either we implement a third register 77 // or we implement a spillover the value from rax to rbx or vice versa during 78 // emitIncrement(). 79 throw GraalError.unimplemented("RAX and RBX are increment registers at the same time, spilling over the scratch register is not supported right now"); 80 } 81 82 // address for counters array 83 AMD64Address countersArrayAddr = new AMD64Address(thread, config.jvmciCountersThreadOffset); 84 Register countersArrayReg = scratch; 85 86 // backup scratch register 87 masm.movq((AMD64Address) crb.asAddress(backupSlot), scratch); 88 89 // load counters array 90 masm.movptr(countersArrayReg, countersArrayAddr); 91 CounterProcedure emitProcedure = (counterIndex, increment, displacement) -> emitIncrement(masm, countersArrayReg, increment, displacement); 92 forEachCounter(emitProcedure, target); 93 94 // restore scratch register 95 masm.movq(scratch, (AMD64Address) crb.asAddress(backupSlot)); 96 } 97 98 /** 99 * Tests if the array contains the register. 100 */ 101 private static boolean contains(Value[] increments, Register register) { 102 for (Value increment : increments) { 103 if (isRegister(increment) && asRegister(increment).equals(register)) { 104 return true; 105 } 106 } 107 return false; 108 } 109 110 private static void emitIncrement(AMD64MacroAssembler masm, Register countersArrayReg, Value incrementValue, int displacement) { 111 // address for counter value 112 AMD64Address counterAddr = new AMD64Address(countersArrayReg, displacement); 113 // increment counter (in memory) 114 if (isJavaConstant(incrementValue)) { 115 int increment = asInt(asJavaConstant(incrementValue)); 116 masm.incrementq(counterAddr, increment); 117 } else { 118 masm.addq(counterAddr, asRegister(incrementValue)); 119 } 120 121 } 122 }