1 /* 2 * Copyright (c) 2013, 2019, 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 package org.graalvm.compiler.lir.amd64; 26 27 import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler; 28 import org.graalvm.compiler.lir.LIRInstructionClass; 29 import org.graalvm.compiler.lir.Opcode; 30 import org.graalvm.compiler.lir.StandardOp; 31 import org.graalvm.compiler.lir.asm.CompilationResultBuilder; 32 33 import jdk.vm.ci.amd64.AMD64Kind; 34 import jdk.vm.ci.code.Register; 35 import jdk.vm.ci.meta.JavaConstant; 36 37 /** 38 * Writes well known garbage values to registers. 39 */ 40 @Opcode("ZAP_REGISTER") 41 public final class AMD64ZapRegistersOp extends AMD64LIRInstruction implements StandardOp.ZapRegistersOp { 42 public static final LIRInstructionClass<AMD64ZapRegistersOp> TYPE = LIRInstructionClass.create(AMD64ZapRegistersOp.class); 43 44 /** 45 * The registers that are zapped. 46 */ 47 protected final Register[] zappedRegisters; 48 49 /** 50 * The garbage values that are written to the registers. 51 */ 52 protected final JavaConstant[] zapValues; 53 54 public AMD64ZapRegistersOp(Register[] zappedRegisters, JavaConstant[] zapValues) { 55 super(TYPE); 56 this.zappedRegisters = zappedRegisters; 57 this.zapValues = zapValues; 58 } 59 60 @Override 61 public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) { 62 for (int i = 0; i < zappedRegisters.length; i++) { 63 Register reg = zappedRegisters[i]; 64 if (reg != null) { 65 AMD64Move.const2reg(crb, masm, reg, zapValues[i], AMD64Kind.QWORD); 66 } 67 } 68 } 69 }