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package com.oracle.truffle.llvm.runtime.interop.export;

import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Fallback;
import com.oracle.truffle.api.dsl.GenerateUncached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.interop.UnknownIdentifierException;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
import com.oracle.truffle.api.profiles.BranchProfile;
import com.oracle.truffle.llvm.runtime.interop.access.LLVMInteropType;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMNode;
import com.oracle.truffle.llvm.runtime.pointer.LLVMPointer;

@GenerateUncached
public abstract class LLVMForeignGetMemberPointerNode extends LLVMNode {

    public abstract LLVMPointer execute(LLVMInteropType type, LLVMPointer pointer, String ident) throws UnsupportedMessageException, UnknownIdentifierException;

    @Specialization(guards = {"cachedMember != null", "cachedMember.struct == struct", "cachedIdent.equals(ident)"})
    LLVMPointer doCached(@SuppressWarnings("unused") LLVMInteropType.Struct struct, LLVMPointer pointer, @SuppressWarnings("unused") String ident,
                    @Cached("ident") @SuppressWarnings("unused") String cachedIdent,
                    @Cached("struct.findMember(cachedIdent)") LLVMInteropType.StructMember cachedMember) {
        return pointer.increment(cachedMember.startOffset).export(cachedMember.type);
    }

    @Specialization(replaces = "doCached")
    static LLVMPointer doGeneric(LLVMInteropType.Struct struct, LLVMPointer pointer, String ident,
                    @Cached BranchProfile exception) throws UnknownIdentifierException {
        LLVMInteropType.StructMember member = struct.findMember(ident);
        if (member == null) {
            exception.enter();
            throw UnknownIdentifierException.create(ident);
        }
        return pointer.increment(member.startOffset).export(member.type);
    }

    
Params:
type – 
object – 
ident – 
See Also:
execute(LLVMInteropType, LLVMPointer, String)/**
     * @param type
     * @param object
     * @param ident
     * @see #execute(LLVMInteropType, LLVMPointer, String)
     */
    @Fallback
    static LLVMPointer doError(LLVMInteropType type, LLVMPointer object, String ident) throws UnsupportedMessageException {
        throw UnsupportedMessageException.create();
    }
}