lib/codegen/CValue.h

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//===-- CValue.h ---------------------------------------------- -*- C++ -*-===//
//
// This file is distributed under the MIT license. See LICENSE.txt for details.
//
// Copyright (C) 2010, Stephen Wilson
//
//===----------------------------------------------------------------------===//

#ifndef COMMA_CODEGEN_CVALUE_HDR_GUARD
#define COMMA_CODEGEN_CVALUE_HDR_GUARD

#include "llvm/ADT/PointerIntPair.h"
#include "llvm/Value.h"

namespace comma {

//===----------------------------------------------------------------------===//
// CValue
//
class CValue {

public:
    CValue() { }

    enum Kind {
        Simple,
        Aggregate,
        Fat
    };


    llvm::Value *first() { return primary; }
    const llvm::Value *first() const { return primary; }


    llvm::Value *second() { return secondary.getPointer(); }
    const llvm::Value *second() const { return secondary.getPointer(); }

    bool isSimple() const { return secondary.getInt() == Simple; }

    bool isAggregate() const { return secondary.getInt() == Aggregate; }

    bool isArray() const { return isAggregate() && second() != 0; }

    bool isFat() const { return secondary.getInt() == Fat; }


    static CValue get(llvm::Value *V1) {
        return CValue(V1, 0, Simple);
    }

    static CValue getArray(llvm::Value *V1, llvm::Value *V2) {
        return CValue(V1, V2, Aggregate);
    }

    static CValue getRecord(llvm::Value *V1) {
        return CValue(V1, 0, Aggregate);
    }

    static CValue getFat(llvm::Value *V1) {
        return CValue(V1, 0, Fat);
    }

private:
    CValue(llvm::Value *V1, llvm::Value *V2, Kind kind)
        : primary(V1), secondary(V2, kind) { }

    llvm::Value *primary;
    llvm::PointerIntPair<llvm::Value*, 2, Kind> secondary;
};

} // end comma namespace.

#endif

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