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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.GenerateUncached;
import com.oracle.truffle.api.dsl.ImportStatic;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.llvm.runtime.CommonNodeFactory;
import com.oracle.truffle.llvm.runtime.interop.LLVMDataEscapeNode;
import com.oracle.truffle.llvm.runtime.interop.access.LLVMInteropType;
import com.oracle.truffle.llvm.runtime.nodes.api.LLVMNode;
import com.oracle.truffle.llvm.runtime.nodes.memory.load.LLVMOffsetLoadNode;
import com.oracle.truffle.llvm.runtime.pointer.LLVMPointer;

@GenerateUncached
@ImportStatic(CommonNodeFactory.class)
public abstract class LLVMForeignReadNode extends LLVMNode {

    static final int VALUE_KIND_COUNT = LLVMInteropType.ValueKind.values().length;

    public abstract Object execute(LLVMPointer ptr, LLVMInteropType type);

    @Specialization
    static Object doStructured(LLVMPointer ptr, @SuppressWarnings(value = "unused") LLVMInteropType.Structured type) {
        // inline structured value, nothing to read
        return ptr;
    }

    @Specialization(guards = "type.kind == cachedKind", limit = "VALUE_KIND_COUNT")
    static Object doValue(LLVMPointer ptr, LLVMInteropType.Value type,
                    @Cached(value = "type.kind", allowUncached = true) @SuppressWarnings(value = "unused") LLVMInteropType.ValueKind cachedKind,
                    @Cached(parameters = "cachedKind") LLVMOffsetLoadNode load,
                    @Cached(parameters = "cachedKind.foreignToLLVMType") LLVMDataEscapeNode dataEscape) {
        Object ret = load.executeWithTargetGeneric(ptr, 0);
        return dataEscape.executeWithType(ret, type.baseType);
    }
}