LLVMAddressGetElementPtrNode.java

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

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.NodeChildren;
import com.oracle.truffle.api.dsl.NodeField;
import com.oracle.truffle.api.dsl.NodeFields;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.llvm.runtime.LLVMAddress;
import com.oracle.truffle.llvm.runtime.LLVMBoxedPrimitive;
import com.oracle.truffle.llvm.runtime.LLVMTruffleObject;
import com.oracle.truffle.llvm.runtime.global.LLVMGlobalVariable;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMExpressionNode;
import com.oracle.truffle.llvm.runtime.types.PointerType;
import com.oracle.truffle.llvm.runtime.types.Type;

@NodeChildren({@NodeChild(type = LLVMExpressionNode.class), @NodeChild(type = LLVMExpressionNode.class)})
@NodeFields({@NodeField(type = int.class, name = "typeWidth"), @NodeField(type = Type.class, name = "targetType")})
public abstract class LLVMAddressGetElementPtrNode extends LLVMExpressionNode {

    public abstract int getTypeWidth();

    public abstract Type getTargetType();

    @Specialization
    public LLVMAddress executePointee(LLVMAddress addr, int val) {
        int incr = getTypeWidth() * val;
        return addr.increment(incr);
    }

    @Specialization
    public LLVMAddress executePointee(LLVMGlobalVariable addr, int val) {
        int incr = getTypeWidth() * val;
        return addr.getNativeLocation().increment(incr);
    }

    @Specialization
    public LLVMTruffleObject executeTruffleObject(LLVMTruffleObject addr, int val) {
        int incr = getTypeWidth() * val;
        return new LLVMTruffleObject(addr.getObject(), addr.getOffset() + incr, new PointerType(getTargetType()));
    }

    @Specialization
    public LLVMAddress executeLLVMBoxedPrimitive(LLVMBoxedPrimitive addr, int val) {
        if (addr.getValue() instanceof Long) {
            int incr = getTypeWidth() * val;
            return LLVMAddress.fromLong((long) addr.getValue() + incr);
        } else {
            CompilerDirectives.transferToInterpreter();
            throw new IllegalAccessError("Cannot do pointer arithmetic with address: " + addr.getValue());
        }
    }

    @Specialization(guards = "notLLVM(addr)")
    public LLVMTruffleObject executeTruffleObject(TruffleObject addr, int val) {
        int incr = getTypeWidth() * val;
        return new LLVMTruffleObject(addr, incr, new PointerType(getTargetType()));
    }

    @Specialization
    public LLVMAddress executePointee(LLVMAddress addr, long val) {
        long incr = getTypeWidth() * val;
        return addr.increment(incr);
    }

    @Specialization
    public LLVMTruffleObject executeTruffleObject(LLVMTruffleObject addr, long val) {
        long incr = getTypeWidth() * val;
        return new LLVMTruffleObject(addr.getObject(), addr.getOffset() + incr, new PointerType(getTargetType()));
    }

    @Specialization
    public LLVMAddress executeLLVMBoxedPrimitive(LLVMBoxedPrimitive addr, long val) {
        if (addr.getValue() instanceof Long) {
            long incr = getTypeWidth() * val;
            return LLVMAddress.fromLong((long) addr.getValue() + incr);
        } else {
            CompilerDirectives.transferToInterpreter();
            throw new IllegalAccessError("Cannot do pointer arithmetic with address: " + addr.getValue());
        }
    }

    @Specialization(guards = "notLLVM(addr)")
    public LLVMTruffleObject executeTruffleObject(TruffleObject addr, long val) {
        long incr = getTypeWidth() * val;
        return new LLVMTruffleObject(addr, incr, new PointerType(getTargetType()));
    }

    @Specialization
    public LLVMAddress executePointee(LLVMGlobalVariable addr, long val) {
        long incr = getTypeWidth() * val;
        return addr.getNativeLocation().increment(incr);
    }

}