I need to say that this is not a good use case. First and most important is that you should not have deployment switches in your code. Your system should be configured for a special deployment mode not detecting in code. Second but not least important you add references to test classes in your business logic. Usually you do not load test code in a production image.
Couldn‘t resist, sorry Norbert > Am 26.05.2018 um 07:46 schrieb Clément Bera <bera.clem...@gmail.com>: > > Just mentioning another use-case: > > getDatabaseInstance > ^ (Production CifTrue: [Database] CifFalse: [MockDatabase]) new > > Since I use conditional compilation more often than just precompiling > constants. > > I don't see an equivalent of asMethodConstant AST manipulation at runtime > strategy in the image for this case right now but it's probably a couple > lines of code with Reflectivity. > >> On Sat, May 26, 2018 at 7:28 AM, Clément Bera <bera.clem...@gmail.com> wrote: >> >> >>> On Fri, May 25, 2018 at 10:44 PM, Esteban Lorenzano <esteba...@gmail.com> >>> wrote: >>> >>> >>>> On 25 May 2018, at 17:30, Clément Bera <bera.clem...@gmail.com> wrote: >>>> >>>> What about a preprocessor like the Java preprocessors ? The Truffle >>>> project relies heavily on that for high performance Java and it's quite >>>> nice. It's difficult to do that in Smalltalk right now. >>>> >>>> I think if you want to do what are asking for you just need to write a >>>> bytecode compiler extension. >>>> >>>> I did something similar in the past to have precomputed constants through >>>> AST manipulation at compilation time. You can find it here with examples: >>>> http://smalltalkhub.com/#!/~ClementBera/NeoCompiler. Once the code is >>>> loaded you need to recompile the examples (NeoCompilerExample >>>> withAllSubclassesDo: #compileAll.). With it you can write code such as: >>>> [ Smalltalk vm class ] Cvalue >>>> And depending if the compiler allowsPrecompilation or not, the bytecode >>>> compiler generates: >>>> Smalltalk vm class >>>> Or just a push literal with the precomputed value (the class >>>> VirtualMachine). >>> >>> this is not what #asMethodConstant provides? >> >> Can you turn asMethodConstant On and Off so you have the constant in >> production and not a development time ? Typically at development time I >> change the constants generated a lot and I don't want to waste time >> recompiling all the time. >> >> But yeah, my project is from 2014. I guess instead of preprocessing you >> could do everything at runtime with AST manipulation/recompilation like in >> asMethodConstant. >> >> The main point of preprocessing IMO is to control performance, it's just >> easier for me to just look at the generated bytecode and change the >> preprocessor until it gets what I want, it's not always easy to run code >> that will change your method at runtime quickly so you can look at the >> bytecode generated. >> >> Anyway, I am not convinced at all something like that should be in the base >> image. >> >>> >>> Esteban >>> >>>> In the end I decided not to use this, but you can use it and extend it to >>>> support more than just constants (any AST manipulation is possible). >>>> Just checked it works in Pharo 6. >>>> >>>>> On Fri, May 25, 2018 at 4:26 PM, Stephan Eggermont <step...@stack.nl> >>>>> wrote: >>>>> Debiller 777 <ozovozovozo...@gmail.com> >>>>> wrote: >>>>> > Well, I've already asked about adding new literals to pharo or >>>>> Smalltalk in >>>>> > general, however this time I have a better idea: >>>>> > macros. Can they be added? Because if I understand correctly they may be >>>>> > the only way to do that. >>>>> >>>>> Why do you think they would be a good idea? We have powerful >>>>> meta-programming facilities that are well understood and somewhat >>>>> supported >>>>> by tooling. How do we get value out of macros? >>>>> >>>>> Stephan >>>>> >>>>> >>>>> >>>> >>>> >>>> >>>> -- >>>> Clément Béra >>>> https://clementbera.github.io/ >>>> https://clementbera.wordpress.com/ >>> >> >> >> >> -- >> Clément Béra >> https://clementbera.github.io/ >> https://clementbera.wordpress.com/ > > > > -- > Clément Béra > https://clementbera.github.io/ > https://clementbera.wordpress.com/
