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

import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.dsl.NodeChild;
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.LLVMIndirectBranchNodeFactory.LLVMIndirectBranchNodeImplNodeGen;
import com.oracle.truffle.llvm.runtime.pointer.LLVMNativePointer;

@GenerateWrapper
@NodeChild(value = "branchAddress", type = LLVMExpressionNode.class)
public abstract class LLVMIndirectBranchNode extends LLVMControlFlowNode {

    public static LLVMIndirectBranchNode create(LLVMExpressionNode branchAddress, int[] indices, LLVMStatementNode[] phiWriteNodes) {
        return LLVMIndirectBranchNodeImplNodeGen.create(indices, phiWriteNodes, branchAddress);
    }

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

    public abstract int executeCondition(VirtualFrame frame);

    abstract static class LLVMIndirectBranchNodeImpl extends LLVMIndirectBranchNode {

        @Children private final LLVMStatementNode[] phiWriteNodes;

        // can't use @NodeField since we need this to be @CompilationFinal
        @CompilationFinal(dimensions = 1) private final int[] successors;

        LLVMIndirectBranchNodeImpl(int[] indices, LLVMStatementNode[] phiWriteNodes) {
            assert indices.length > 1;
            this.successors = indices;
            this.phiWriteNodes = phiWriteNodes;
        }

        @Override
        public int getSuccessorCount() {
            return successors.length;
        }

        @Override
        public LLVMStatementNode getPhiNode(int successorIndex) {
            return phiWriteNodes[successorIndex];
        }

        @Specialization
        public int doCondition(LLVMNativePointer branchAddress) {
            return (int) branchAddress.asNative();
        }

        @Override
        public int[] getSuccessors() {
            return successors;
        }
    }
}