JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package org.graalvm.compiler.lir.amd64;

import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.COMPOSITE;
import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;

import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;
import org.graalvm.compiler.core.common.LIRKind;
import org.graalvm.compiler.lir.LIRInstructionClass;
import org.graalvm.compiler.lir.Opcode;
import org.graalvm.compiler.lir.asm.CompilationResultBuilder;

import jdk.vm.ci.amd64.AMD64;
import jdk.vm.ci.amd64.AMD64Kind;
import jdk.vm.ci.code.RegisterValue;
import jdk.vm.ci.meta.Value;

/**
 * Zeros a chunk of memory using rep stosb.
 */
@Opcode("ZERO_MEMORY")
public final class AMD64ZeroMemoryOp extends AMD64LIRInstruction {

    public static final LIRInstructionClass<AMD64ZeroMemoryOp> TYPE = LIRInstructionClass.create(AMD64ZeroMemoryOp.class);

    @Use({COMPOSITE}) protected AMD64AddressValue pointer;
    @Use({REG}) protected RegisterValue length;

    @Temp protected Value pointerTemp;
    @Temp protected Value valueTemp;
    @Temp protected Value lengthTemp;

    public AMD64ZeroMemoryOp(AMD64AddressValue pointer, RegisterValue length) {
        super(TYPE);
        this.pointer = pointer;
        this.length = length;

        this.pointerTemp = AMD64.rdi.asValue(LIRKind.value(AMD64Kind.QWORD));
        this.valueTemp = AMD64.rax.asValue(LIRKind.value(AMD64Kind.QWORD));
        this.lengthTemp = AMD64.rcx.asValue(LIRKind.value(AMD64Kind.QWORD));

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