QtCS2017 Before Runtime discussion: Difference between revisions
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== Make the API easy? == | == Presentation / starting Subjects == | ||
=== Make the API easy? === | |||
* Copy on Write to avoid copies at runtime | * Copy on Write to avoid copies at runtime | ||
* Can we do it at compile time? | * Can we do it at compile time? | ||
| Line 6: | Line 7: | ||
* Clang can help here | * Clang can help here | ||
== Make changes easy == | === Make changes easy === | ||
* API changes are expensive | * API changes are expensive | ||
* API looks outdated if not adapted to current paradigms (legacy code) | * API looks outdated if not adapted to current paradigms (legacy code) | ||
| Line 12: | Line 13: | ||
* How can Clang help here | * How can Clang help here | ||
== Clang Query == | === Clang Query === | ||
* Think about it as SQL for the AST | * Think about it as SQL for the AST | ||
* Makes big changes much cheaper and secure | * Makes big changes much cheaper and secure | ||
== Immediate feedback vs overnight refactoring == | === Immediate feedback vs overnight refactoring === | ||
* Both are important | * Both are important | ||
* Immediate feedback reduces refactorings and reviews | * Immediate feedback reduces refactorings and reviews | ||
| Line 22: | Line 23: | ||
* Integration with the CI | * Integration with the CI | ||
== Notes == | |||
* need real examples | * need real examples | ||
* QtCreator supports only very basic refactoring tools | * QtCreator supports only very basic refactoring tools | ||
| Line 41: | Line 42: | ||
* how far can we get with transformation with tools? | * how far can we get with transformation with tools? | ||
* Clangtidy is alreadys there | * Clangtidy is alreadys there | ||
* these tools are not available on all desktop | ** can have plugins | ||
** how can it be a part of our workflow | |||
* these tools are not available on all desktop platforms | |||
** so this can not the only way to do these transformations | ** so this can not the only way to do these transformations | ||
* example: new Qt connections -> running transformation -> slightly different behavior | |||
* problem with #ifdef sections | |||
* kind of cross compilation with clangtidy with necessary defines | |||
** possibility to skip some of the problematic headers | |||
* warn about section where we can not do our work | |||
* the tool only helps when changes are there, but it should not decrease the border to have these changes | |||
* good example: QRegEx -> QRegularExpression | |||
* there are two different tasks | |||
** show it immediately | |||
** batch processing task | |||
* we need both, but they are sharing code | |||
* clang static analyzer is something different | |||
=== Conclusion === | |||
* we need and want this | |||
* this should not only happen in the Berlin office | |||
* can QtCreator show Clazy warnings? | |||
** was not working in the past | |||
** but this would be the first step to go further | |||
Latest revision as of 12:06, 9 October 2017
Presentation / starting Subjects
Make the API easy?
- Copy on Write to avoid copies at runtime
- Can we do it at compile time?
- Let tools get const and references right
- Warn about unnecessary copies
- Clang can help here
Make changes easy
- API changes are expensive
- API looks outdated if not adapted to current paradigms (legacy code)
- How can we make them easy
- How can Clang help here
Clang Query
- Think about it as SQL for the AST
- Makes big changes much cheaper and secure
Immediate feedback vs overnight refactoring
- Both are important
- Immediate feedback reduces refactorings and reviews
- Run refactorings overnight for expansive refactorings
- Integration with the CI
Notes
- need real examples
- QtCreator supports only very basic refactoring tools
- having tools outside of QtCreator and use these tools maybe inside
- API changes need to be available by Clangtidy scripts (?)
- what about templates?
- concept
- the tools cannot fit to all cases
- this kind of tools can help to move to Qt 6(or other future versions)
- renaming methods would be easier with this kind of tools
- mental work to remember this new name is still there
- can a tool do exchange deprecate things with the new "right" thing
- using clang "Fixit" maybe possible
- clang is here a tool and not the only compiler
- these "Fixit" information should be inside the code
- if it is not there it will lose sync to the code
- maybe inside the code there can be a link to something?
- how far can we get with transformation with tools?
- Clangtidy is alreadys there
- can have plugins
- how can it be a part of our workflow
- these tools are not available on all desktop platforms
- so this can not the only way to do these transformations
- example: new Qt connections -> running transformation -> slightly different behavior
- problem with #ifdef sections
- kind of cross compilation with clangtidy with necessary defines
- possibility to skip some of the problematic headers
- warn about section where we can not do our work
- the tool only helps when changes are there, but it should not decrease the border to have these changes
- good example: QRegEx -> QRegularExpression
- there are two different tasks
- show it immediately
- batch processing task
- we need both, but they are sharing code
- clang static analyzer is something different
Conclusion
- we need and want this
- this should not only happen in the Berlin office
- can QtCreator show Clazy warnings?
- was not working in the past
- but this would be the first step to go further