LLVMToI8Node.java

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package com.oracle.truffle.llvm.nodes.cast;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.interop.ForeignAccess;
import com.oracle.truffle.api.interop.Message;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.llvm.runtime.LLVMAddress;
import com.oracle.truffle.llvm.runtime.LLVMBoxedPrimitive;
import com.oracle.truffle.llvm.runtime.LLVMFunctionDescriptor;
import com.oracle.truffle.llvm.runtime.LLVMFunctionHandle;
import com.oracle.truffle.llvm.runtime.LLVMIVarBit;
import com.oracle.truffle.llvm.runtime.LLVMTruffleObject;
import com.oracle.truffle.llvm.runtime.floating.LLVM80BitFloat;
import com.oracle.truffle.llvm.runtime.global.LLVMGlobalVariable;
import com.oracle.truffle.llvm.runtime.interop.ToLLVMNode;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMExpressionNode;

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

    @Specialization
    public byte executeI8(LLVMFunctionDescriptor from) {
        return (byte) from.getFunctionPointer();
    }

    @Specialization
    public byte executeI8(LLVMFunctionHandle from) {
        return (byte) from.getFunctionPointer();
    }

    @Specialization
    public byte executeLLVMAddress(LLVMGlobalVariable from) {
        return (byte) from.getNativeLocation().getVal();
    }

    @Specialization
    public byte executeLLVMTruffleObject(LLVMTruffleObject from) {
        return (byte) (executeTruffleObject(from.getObject()) + from.getOffset());
    }

    @Child private Node isNull = Message.IS_NULL.createNode();
    @Child private Node isBoxed = Message.IS_BOXED.createNode();
    @Child private Node unbox = Message.UNBOX.createNode();
    @Child private ToLLVMNode convert = ToLLVMNode.createNode(byte.class);

    @Specialization(guards = "notLLVM(from)")
    public byte executeTruffleObject(TruffleObject from) {
        if (ForeignAccess.sendIsNull(isNull, from)) {
            return 0;
        } else if (ForeignAccess.sendIsBoxed(isBoxed, from)) {
            try {
                return (byte) convert.executeWithTarget(ForeignAccess.sendUnbox(unbox, from));
            } catch (UnsupportedMessageException e) {
                CompilerDirectives.transferToInterpreter();
                throw new IllegalStateException(e);
            }
        }
        CompilerDirectives.transferToInterpreter();
        throw new IllegalStateException("Not convertable");
    }

    @Specialization
    public byte executeLLVMBoxedPrimitive(LLVMBoxedPrimitive from) {
        return (byte) convert.executeWithTarget(from.getValue());
    }

    public abstract static class LLVMToI8NoZeroExtNode extends LLVMToI8Node {

        @Specialization
        public byte executeI8(boolean from) {
            return from ? (byte) -1 : 0;
        }

        @Specialization
        public byte executeI8(short from) {
            return (byte) from;
        }

        @Specialization
        public byte executeI8(int from) {
            return (byte) from;
        }

        @Specialization
        public byte executeI8(long from) {
            return (byte) from;
        }

        @Specialization
        public byte executeI8(LLVMIVarBit from) {
            return from.getByteValue();
        }

        @Specialization
        public byte executeI8(float from) {
            return (byte) from;
        }

        @Specialization
        public byte executeI8(double from) {
            return (byte) from;
        }

        @Specialization
        public byte executeI8(LLVM80BitFloat from) {
            return from.getByteValue();
        }

        @Specialization
        public byte executeI8(LLVMAddress from) {
            return (byte) from.getVal();
        }

        @Specialization
        public byte executeI8(byte from) {
            return from;
        }

    }

    public abstract static class LLVMToI8ZeroExtNode extends LLVMToI8Node {

        @Specialization
        public byte executeI8(boolean from) {
            return (byte) (from ? 1 : 0);
        }

        @Specialization
        public byte executeI8(byte from) {
            return from;
        }
    }

}