JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2012, 2018, 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.sparc;

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

import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler;
import org.graalvm.compiler.lir.LIRInstructionClass;
import org.graalvm.compiler.lir.Opcode;
import org.graalvm.compiler.lir.asm.CompilationResultBuilder;

import jdk.vm.ci.meta.Value;

/**
 * Emits a breakpoint.
 */
@Opcode("BREAKPOINT")
public final class SPARCBreakpointOp extends SPARCLIRInstruction {
    public static final LIRInstructionClass<SPARCBreakpointOp> TYPE = LIRInstructionClass.create(SPARCBreakpointOp.class);
    public static final SizeEstimate SIZE = SizeEstimate.create(1);

    // historical - from hotspot src/cpu/sparc/vm
    // <sys/trap.h> promises that the system will not use traps 16-31
    // We want to use ST_BREAKPOINT here, but the debugger is confused by it.
    public static final int ST_RESERVED_FOR_USER_0 = 0x10;

    /**
     * A set of values loaded into the Java ABI parameter locations (for inspection by a debugger).
     */
    @Use({REG, STACK}) protected Value[] parameters;


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