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 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 * published by the Free Software Foundation.
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 * 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.nodes;

import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_IGNORED;
import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_IGNORED;

import org.graalvm.compiler.core.common.type.StampFactory;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.graph.NodeInputList;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.spi.LIRLowerable;
import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;

A node that results in a platform dependent breakpoint instruction being emitted. A number of
arguments can be associated with such a node for placing values of interest in the Java ABI
specified parameter locations corresponding to the kinds of the values. That is, the arguments
are set up as if the breakpoint instruction was a call to a compiled Java method.

A breakpoint is usually place by defining a node intrinsic method as follows:
 @NodeIntrinsic(BreakpointNode.class) static void breakpoint(Object object, Word mark, Word value) { throw new GraalError(""); } 
Note that the signature is arbitrary. It's sole purpose is to capture values you may want to
inspect in the native debugger when the breakpoint is hit.
/**
 * A node that results in a platform dependent breakpoint instruction being emitted. A number of
 * arguments can be associated with such a node for placing values of interest in the Java ABI
 * specified parameter locations corresponding to the kinds of the values. That is, the arguments
 * are set up as if the breakpoint instruction was a call to a compiled Java method.
 * <p>
 * A breakpoint is usually place by defining a node intrinsic method as follows:
 *
 * <pre>
 *     {@literal @}NodeIntrinsic(BreakpointNode.class)
 *     static void breakpoint(Object object, Word mark, Word value) {
 *          throw new GraalError("");
 *     }
 * </pre>
 *
 * Note that the signature is arbitrary. It's sole purpose is to capture values you may want to
 * inspect in the native debugger when the breakpoint is hit.
 */
@NodeInfo(cycles = CYCLES_IGNORED, size = SIZE_IGNORED)
public final class BreakpointNode extends FixedWithNextNode implements LIRLowerable {

    public static final NodeClass<BreakpointNode> TYPE = NodeClass.create(BreakpointNode.class);
    @Input NodeInputList<ValueNode> arguments;

    public BreakpointNode(ValueNode... arguments) {
        super(TYPE, StampFactory.forVoid());
        this.arguments = new NodeInputList<>(this, arguments);
    }

    @Override
    public void generate(NodeLIRBuilderTool gen) {
        gen.visitBreakpointNode(this);
    }

    public NodeInputList<ValueNode> arguments() {
        return arguments;
    }

    @NodeIntrinsic
    public static native void breakpoint();
}