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

import com.oracle.truffle.api.CompilerAsserts;
import com.oracle.truffle.api.dsl.NodeChild;
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.LLVMExpressionNode;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMStatementNode;
import com.oracle.truffle.llvm.runtime.nodes.control.LLVMConditionalBranchNodeFactory.LLVMConditionalBranchNodeImplNodeGen;

@GenerateWrapper
@NodeField(name = "trueSuccessor", type = int.class)
@NodeField(name = "falseSuccessor", type = int.class)
@NodeChild(value = "condition", type = LLVMExpressionNode.class)
public abstract class LLVMConditionalBranchNode extends LLVMControlFlowNode {

    public static LLVMConditionalBranchNode create(int trueSuccessor, int falseSuccessor, LLVMStatementNode truePhi, LLVMStatementNode falsePhi, LLVMExpressionNode condition) {
        return LLVMConditionalBranchNodeImplNodeGen.create(truePhi, falsePhi, condition, trueSuccessor, falseSuccessor);
    }

    public static final int TRUE_SUCCESSOR = 0;
    public static final int FALSE_SUCCESSOR = 1;

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

    public abstract boolean executeCondition(VirtualFrame frame);

    public abstract int getTrueSuccessor();

    public abstract int getFalseSuccessor();

    abstract static class LLVMConditionalBranchNodeImpl extends LLVMConditionalBranchNode {

        @Child private LLVMStatementNode truePhi;
        @Child private LLVMStatementNode falsePhi;

        LLVMConditionalBranchNodeImpl(LLVMStatementNode truePhi, LLVMStatementNode falsePhi) {
            this.truePhi = truePhi;
            this.falsePhi = falsePhi;
        }

        @Override
        public String toString() {
            return getShortString("trueSuccessor", "falseSuccessor");
        }

        @Override
        public int getSuccessorCount() {
            return 2;
        }

        @Override
        public LLVMStatementNode getPhiNode(int successorIndex) {
            CompilerAsserts.partialEvaluationConstant(successorIndex);
            if (successorIndex == TRUE_SUCCESSOR) {
                return truePhi;
            } else {
                assert successorIndex == FALSE_SUCCESSOR;
                return falsePhi;
            }
        }

        @Specialization
        public boolean doCondition(boolean condition) {
            return condition;
        }

        @Override
        public int[] getSuccessors() {
            return new int[]{getTrueSuccessor(), getFalseSuccessor()};
        }
    }
}