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 * 3. Neither the name of the copyright holder nor the names of its contributors may be used to
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package com.oracle.truffle.llvm.runtime.nodes.cast;

import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.library.CachedLibrary;
import com.oracle.truffle.llvm.runtime.CommonNodeFactory;
import com.oracle.truffle.llvm.runtime.nodes.cast.LLVMToI64Node.LLVMBitcastToI64Node;
import com.oracle.truffle.llvm.runtime.LLVMIVarBit;
import com.oracle.truffle.llvm.runtime.floating.LLVM80BitFloat;
import com.oracle.truffle.llvm.runtime.interop.convert.ForeignToLLVM;
import com.oracle.truffle.llvm.runtime.interop.convert.ForeignToLLVM.ForeignToLLVMType;
import com.oracle.truffle.llvm.runtime.library.internal.LLVMAsForeignLibrary;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMExpressionNode;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMToNativeNode;
import com.oracle.truffle.llvm.runtime.pointer.LLVMManagedPointer;
import com.oracle.truffle.llvm.runtime.pointer.LLVMPointer;
import com.oracle.truffle.llvm.runtime.vector.LLVMI1Vector;
import com.oracle.truffle.llvm.runtime.vector.LLVMI8Vector;

@NodeChild(value = "fromNode", type = LLVMExpressionNode.class)
public abstract class LLVMToI8Node extends LLVMExpressionNode {

    @Specialization(guards = {"isForeignNumber(from, foreigns, interop)"})
    protected byte doManagedPointer(LLVMManagedPointer from,
                    @Cached("createForeignToLLVM()") ForeignToLLVM toLLVM,
                    @CachedLibrary(limit = "1") LLVMAsForeignLibrary foreigns,
                    @SuppressWarnings("unused") @CachedLibrary(limit = "3") InteropLibrary interop) {
        return (byte) toLLVM.executeWithTarget(foreigns.asForeign(from.getObject()));
    }

    @Specialization
    protected byte doPointer(LLVMPointer from,
                    @Cached("createToNativeWithTarget()") LLVMToNativeNode toNative) {
        return (byte) toNative.executeWithTarget(from).asNative();
    }

    protected ForeignToLLVM createForeignToLLVM() {
        return CommonNodeFactory.createForeignToLLVM(ForeignToLLVMType.I8);
    }

    protected static boolean isForeignNumber(LLVMManagedPointer pointer, LLVMAsForeignLibrary foreigns, InteropLibrary interop) {
        return foreigns.isForeign(pointer) && interop.isNumber(pointer.getObject());
    }

    public abstract static class LLVMSignedCastToI8Node extends LLVMToI8Node {

        @Specialization
        protected byte doI8(boolean from) {
            return from ? (byte) -1 : 0;
        }

        @Specialization
        protected byte doI8(byte from) {
            return from;
        }

        @Specialization
        protected byte doI8(short from) {
            return (byte) from;
        }

        @Specialization
        protected byte doI8(int from) {
            return (byte) from;
        }

        @Specialization
        protected byte doI8(long from) {
            return (byte) from;
        }

        @Specialization
        protected byte doI8(LLVMIVarBit from) {
            return from.getByteValue();
        }

        @Specialization
        protected byte doI8(float from) {
            return (byte) from;
        }

        @Specialization
        protected byte doI8(double from) {
            return (byte) from;
        }

        @Specialization
        protected byte doI8(LLVM80BitFloat from) {
            return from.getByteValue();
        }
    }

    public abstract static class LLVMUnsignedCastToI8Node extends LLVMToI8Node {

        @Specialization
        protected byte doI1(boolean from) {
            return (byte) (from ? 1 : 0);
        }

        @Specialization
        protected byte doI8(byte from) {
            return from;
        }

        @Specialization
        protected byte doIVarBit(LLVMIVarBit from) {
            return from.getZeroExtendedByteValue();
        }

        @Specialization
        protected byte doFloat(float from) {
            return (byte) from;
        }

        @Specialization
        protected byte doFloat(double from) {
            return (byte) from;
        }

        @Specialization
        protected byte doLLVM80BitFloat(LLVM80BitFloat from) {
            return from.getByteValue();
        }
    }

    public abstract static class LLVMBitcastToI8Node extends LLVMToI8Node {

        @Specialization
        protected byte doI8(byte from) {
            return from;
        }

        @Specialization
        protected byte doI1Vector(LLVMI1Vector from) {
            return (byte) LLVMBitcastToI64Node.castI1Vector(from, Byte.SIZE);
        }

        @Specialization
        protected byte doI8Vector(LLVMI8Vector from) {
            assert from.getLength() == 1 : "invalid vector size";
            return from.getValue(0);
        }
    }
}