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package com.oracle.truffle.llvm.runtime.nodes.control;

import com.oracle.truffle.api.dsl.NodeField;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.instrumentation.GenerateWrapper;
import com.oracle.truffle.api.instrumentation.ProbeNode;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMControlFlowNode;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMStatementNode;
import com.oracle.truffle.llvm.runtime.nodes.control.LLVMBrUnconditionalNodeFactory.LLVMBrUnconditionalNodeImplNodeGen;

@GenerateWrapper
@NodeField(name = "successor", type = int.class)
public abstract class LLVMBrUnconditionalNode extends LLVMControlFlowNode {

    public static LLVMBrUnconditionalNode create(int successor, LLVMStatementNode phi) {
        return LLVMBrUnconditionalNodeImplNodeGen.create(phi, successor);
    }

    @Override
    public WrapperNode createWrapper(ProbeNode probe) {
        return new LLVMBrUnconditionalNodeWrapper(this, probe);
    }

    public abstract int getSuccessor();

    // we need an execute method so the node can be properly instrumented
    public abstract void execute(VirtualFrame frame);

    abstract static class LLVMBrUnconditionalNodeImpl extends LLVMBrUnconditionalNode {

        @Child private LLVMStatementNode phi;

        LLVMBrUnconditionalNodeImpl(LLVMStatementNode phi) {
            this.phi = phi;
        }

        @Override
        public String toString() {
            return getShortString("successor");
        }

        @Override
        public int getSuccessorCount() {
            return 1;
        }

        @Override
        public LLVMStatementNode getPhiNode(int successorIndex) {
            assert successorIndex == 0;
            return phi;
        }

        @Specialization
        public void doCondition() {
            // nothing to do, since this branch is unconditional
        }

        @Override
        public final int[] getSuccessors() {
            return new int[]{getSuccessor()};
        }
    }
}