.NET Fringe Japan 2018 New Year Party https://dotnetfringe-japan.connpass.com/event/74536/

1. How to make
the calculator
.NET FRINGE JAPAN 2018 KOUJI MATSUI (@KEKYO2)

2. 2
Kouji Matsui - kekyo
• NAGOYA city, AICHI pref., JP
• Twitter – @kekyo2 / Facebook
• ux-spiral corporation
• Microsoft Most Valuable Professional VS
and DevTech 2015-
• Certified Scrum master / Scrum product
owner
• Center CLR organizer.
• .NET/C#/F#/IL/metaprogramming or
like…
• Bike rider
CC-BY-SA 4.0 COPYRIGHT (C) 2016 KOUJI MATSUI

3. 3
Agenda
• Introduction
• Operator notations
• Demo
• Conclusion
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4. 4
How bring
up about
the
calculator?
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MATSUI
HP16C (RPN)

5. 5
Operator notations
• Operator notation variation:
CC-BY-SA 4.0 COPYRIGHT (C) 2016 KOUJI MATSUI
Polish notation
(PN)
“+ 123 456”
Infix notation
“123 + 456”
Reverse polish notation
(RPN)
“123 456 +”

6. 6
Operator notations
• Polish notation (PN):
• Operator first
• Trailing two values and more
CC-BY-SA 4.0 COPYRIGHT (C) 2016 KOUJI MATSUI
“+ 123 456”
“* + 123 456 789”
 123 + 456
 (123 + 456) * 789

7. 7
Operator notations
CC-BY-SA 4.0 COPYRIGHT (C) 2016 KOUJI MATSUI
(* (+ 123 456) 789)
(* (+ 123 456) (- 11 22))
“* + 123 456 789”
“* + 123 456 - 11 22”

8. 8
Operator notations
• Parse and construct AST easier
CC-BY-SA 4.0 COPYRIGHT (C) 2016 KOUJI MATSUI
“+ 123 456”
+ 123
456

9. 9
Operator notations
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AbstractNode
OperatorNode
ReducibleNode
NumericNode
ExpressionNodeReduce()

10. 10
Operator notations
CC-BY-SA 4.0 COPYRIGHT (C) 2016 KOUJI MATSUI
“+ 123 456”
+ 123
456OperatorNode
NumericNode
NumericNode
ExpressionNode

11. 11
Operator notations
CC-BY-SA 4.0 COPYRIGHT (C) 2016 KOUJI MATSUI
+ 123
456
“* + 123 456 789”
*
789
ExpressionNode
ExpressionNode
• Nested nodes

12. 12
Operator notations
• Reduce() “Beta reduction”
CC-BY-SA 4.0 COPYRIGHT (C) 2016 KOUJI MATSUI
+ 123
456
*
789
return 123
return 456
return 123+456
return 789
return 579*789
456831

13. 13
Demo
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14. 14
CC-BY-SA 4.0 COPYRIGHT (C) 2016 KOUJI MATSUI
Making archive
IL2C
#6-52
2018.1.27 CENTER CLR VIDEO #6-52
.NET Fringe Japan 2018 New Year Party
- Kouji Matsui (@kekyo2)
再放送

15. 15
Between dotnet600 and fringe2018
• Will slow down (but better incremental development)
• System.String turn to use UTF16LE
• Take down concurrent GC support (bad) code elements.
• Flow analyzer causes detecting bad path.
• Flow path may constructs randomly.
• Stack analyzer causes matching bad path.
• Support derived class type and can handle virtual/abstract/override
methods.  AbstractNode and ASTs
• Tested on UEFI environments (The demo).
CC-BY-SA 4.0 COPYRIGHT (C) 2016 KOUJI MATSUI

16. 16
Derived class type
Current version not supported cast operator and exceptions.
◦ Transleted to C language: can’t detect invalid pointer conversion.
Virtual methods:
◦ We have to support vtable/vptr or other technics.
◦ IL2C already has type-information structure. I use it storage by store
function pointers into side-by-side.
◦ Lookup vtable at runtime (likely C++).
CC-BY-SA 4.0 COPYRIGHT (C) 2016 KOUJI MATSUI

17. 17
Conclusion
• Polish notation – easyway parsing expressions.
• IL2C now UEFI, WDM, Win32, Arduino
• We’ll be making IL2C on multi-platform
• IL2C is under construction.
• Primitive types.
• String
• Class / ValueType / Boxing
• Polymorphism (by class)
• GC (non concurrent)
• P/Invoke (basic)
CC-BY-SA 4.0 COPYRIGHT (C) 2016 KOUJI MATSUI
Playlist: http://bit.ly/2xtu4MH
GitHub: https://github.com/kekyo/IL2C

18. 18
Thank you joining my session!!
• Become slides on slideshare and my blog entry.
http://www.kekyo.net/ (Sorry blog only Japanese language)
• My twitter account @kekyo2, follow <3
• GitHub https://github.com/kekyo/ contains:
• IL2C, FusionTasks, RelaxVersioner, fscx and more…
• Open conference with “Center CLR” in Aichi
pref., Japan! Join us!!
https://www.meetup.com/en-US/CenterCLR/
CC-BY-SA 4.0 COPYRIGHT (C) 2016 KOUJI MATSUI