David Heffernan

DLLs should take charge of this. They should either make it part of their contract that the host sets the fp control state to a specific state. Or they should set it on entry, and restore it on exit. My DLL does the latter.

It's time to start using revision control

Why are you using ShellExecute. That's a deprecated function that used to be used to execute shell actions, but has been replaced by ShellExecuteEx. If you want to execute a specific program why aren't you using CreateProcess?

This is pretty epic, let's be honest. Take all the drudge out, and let us work on the brain stuff.

That's kind of a vague specification. For instance, is the data pushed or pulled? I would imagine that makes a difference.

The real trick there is not to do it. Avoid it at all costs.

I don't really understand this. I always write the try/finally immediately after the construction, and always bang the Free in immediately. Then I fill out the body. It's just a habit that you form so that you don't make such mistakes. And honestly, this is never one that is hard to debug because you just have a leak. And presumably you use leak detection tools so that you'd always find them immediately. I don't really understand this scenario either. If you have a reference to something that may or may not exist, you would test Assigned() before using it. And when you were finished, you'd set the reference back to nil once you'd destroyed it. The scenario that is tricky is when you have multiple references to an object.

Keep searching then

It's odd you say that, but I never have to debug issues like this. There are two simple patterns for lifetime and they are so ingrained, nobody ever makes a mistake in my team.

(PDF) Application of artificial intelligence in compiler design (researchgate.net)  (ijresm.com)

Yeah, you are wrong. Such people exist. I am one. Not necessarily. No reason why pointer arithmetic should be faster than, for example, plain indexing of arrays. Again, good compilers are often better than humans. I don't think pointers are used in the RTL especially more than other libraries, and I don't think pointers are used there fore for optimisation and performance. As far as this whole memory safety debate goes, you can't exclude the RTL from it. That code executes in the code that is subject to attack.

I'm not quite sure what you are saying here? Are you looking to hire somebody?

This was in fact mentioned

I guess they will be able to say that the numbers of bugs reported is going down and claim that indicates quality has improved.

Split views which other IDEs have had for years. And bug fixes. But still no way to report bugs. Does this seem like value for money to anybody?

Unlucky for you. I've so far never encountered such a problem. The type of thing that forces me to debug 64 bit is when it's my DLL hosted in a 64 bit process, and I don't have a 32 bit version of the host.

I think all in all, it's clear that the current in-process design is the right one

How are you going to have the components paint themselves on the design surface?

Win64 debugger is known to be terrible. Perhaps slightly less so with more recent versions. I always debug 32 bit if at all possible. But sometimes you have a scenario where that's not possible. Unlucky if you do.

I can imagine this working fine for non visual components but what about components that paint themselves on the design surface? Cross process window hierarchies are basically untenable.

Automatic stack allocation is faster than all heap allocators, and has no thread contention. And Delphi's current heap allocator is known not to be scalable. I've measured this in a real world setting. Avoiding heap allocations when converting numbers (integer and real) to text makes a huge performance difference when creating files, e.g. XML, JSON, YAML. Even when single threaded. When multi-threading the impact is even greater, if using the default heap allocator. I personally use isolated per thread heaps to reduce contention. This doesn't eliminate it because every allocation/deallocation that requires a call to VirtualAlloc and friends has contention.

I mean, how hard could it be????

You suspect encoding is an issue but I can't see in your post any discussion of encoding.

Sometimes you do compare up to tolerance. Sometimes that's the right way to do it. But you need to know how to choose the tolerance. And it's definitely wrong to say that one must never compare exactly. Sometimes you can. Although delphi rtl works against you. For instance you'd hope to be able to convert floats to text, and back, and get the same value. In Delphi using the rtl functions this isn't always the case. Embarcadero have known this for more than a decade and not done anything yet. I just don't think they have the resources required to prioritise this given all their other commitments.

It depends on what you are comparing, what algorithms are involved etc.