This is a for-what-its-worth sort of thing, not specific to any software…
Exposure and white balance are both unconstrained arithmetic multiplication of the image data. I’d surmise that they need to be done before any tone curve, with special attention to not pushing the data into clipping at the white point. Once the data is positioned thusly, the tone curves mostly peak at the white point, which means they usually don’t push the data past white. With that in mind, I’d put the tone curves after such multiplication.
Indeed, that pretty much describes my workflow. At the end of demosaic, I have a RGB image that is still scaled to the original camera range, in my case 14-bit. I think a lot of folk would then scale the data to fit in the display range using exposure; I use a blackwhitepoint tool that has an option to place black and white at the min and max of the data. So now, I have a RGB image with data that is linearly scaled to fit between black and white. At this point, I usually introduce a curve, which now redistributes the data non-linearly for some purpose, usually to lift the shadows into visibility. Lately, it’s been mostly a filmic curve, but sometimes I want to pull the lower data “lower”, so I’ll use a manually-constructed S-curve. But sometimes, the linear data looks fine, so I leave it “uncurved”. Depends on how the scene was lighted, or even just my whim. I love to separate a bright subject from its darker background with such a curve; I recently did one of these for this PlayRaw, with a screenshot of the curve:
I’m also a fan of minimizing the number of operations. I think sometimes we whipsaw the data with sometimes conflicting operations, especially curves, at the expense of color saturation and casts. I’ll usually start with filmic, but if it isn’t scratching my itch, I’ll pull it out and replace it with a manual curve. Very Very rarely will I use both. I’d like to take this minimalism to an extreme and use my camera profile to also correct white balance (I’ve messed wtih such, and it works well), but I’m too lazy to shoot ColorChecker shots for most sessions 
Anyhoo, take-with-grain-o-salt…