private UnwrapInfo?GetUnwrapInfo(ArrayType arrayType, Type typeInArray)
{
long unwrapCount;
Type unwrapType;
// in bits
long unwrapTypeWidth;
if (typeInArray.IsPointerToPrimitiveType())
{
// need to unwrap if field is array of pointer to primitive type
// int* A[N]
// becomes
// int* A_0;
// int* A_N;
// unwrap to multiple pointer fields
unwrapType = new PointerType
{
QualifiedPointee = ((PointerType)typeInArray).QualifiedPointee
};
unwrapCount = arrayType.Size;
// TODO: get type width from driver TargetInfo!
unwrapTypeWidth = 0;
}
else if (typeInArray.IsPointerToArrayType())
{
// need to unwrap if field is array of pointer to array
// A (*int[N])[M]
// becomes
// int** X_0;
// int** X_M;
var innerArray = (ArrayType)((PointerType)typeInArray).Pointee;
unwrapType = new PointerType
{
QualifiedPointee = new QualifiedType(new PointerType
{
QualifiedPointee = new QualifiedType(innerArray.Type)
})
};
unwrapCount = arrayType.Size;
unwrapTypeWidth = Driver.TargetInfo.PointerWidth;
}
else if (typeInArray is ArrayType)
{
// need to unwrap if field is array of array
// int A[N][M]
// becomes
// int A_0[M];
// int A_N[M];
Type innerArray = ((ArrayType)(typeInArray)).Type;
unwrapType = new ArrayType
{
Size = ((ArrayType)(typeInArray)).Size,
SizeType = ArrayType.ArraySize.Constant,
Type = innerArray
};
unwrapCount = arrayType.Size / ((ArrayType)(typeInArray)).Size;
// TODO: get type width from driver TargetInfo!
unwrapTypeWidth = 0;
}
else if (!typeInArray.IsPrimitiveType())
{
// need tp unwrap if field is array of complex type
// Struct A[N]
// becomes
// Struct A_0;
// Struct A_N;
unwrapType = typeInArray;
unwrapCount = arrayType.Size;
// TODO: get type width from driver TargetInfo!
unwrapTypeWidth = 0;
}
else
{
return(null);
}
return(new UnwrapInfo
{
UnwrapType = unwrapType,
UnwrapCount = unwrapCount,
UnwrapTypeWidth = unwrapTypeWidth
});
}