Language-side Foreign Function Interfaces with NativeBoost

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1 Language-side Foreign Function Interfaces with NativeBoost IWST 2013 Camillo Bruni, Luc Fabresse, Stéphane Ducasse, Igor Stasenko

2 Outline 1.Context 2.Existing Solutions 3.NativeBoost 4.Speed Comparison of NativeBoost with other FFIs 5.NativeBoost Internals 6.Conclusion & Future Work 2

3 Context Language Cairo OpenGL Chipmunk Virtual Machine (VM)... LibC 3

4 Context Language Cairo OpenGL Chipmunk Virtual Machine (VM)... LibC How to interact with external libraries? 4

5 Existing Solutions Language-side Library VM Extension VM Plugin Foreign Function Interface VM-level Language-level 5

6 Existing Solutions Language-side Library costly VM Extension VM Plugin Foreign Function Interface VM-level Language-level 6

7 Existing Solutions Language-side Library VM Extension VM Plugin costly low-level Foreign Function Interface VM-level Language-level 7

8 Existing Solutions Language-side Library VM Extension VM Plugin costly low-level Foreign Function Interface VM-level Language-level fast slow 8

9 NativeBoost A language-side and fast FFI implementation 9

10 Language-side Extensible Easy to use no VM code needed no low-level code (C wrapper) needed 10

11 Fast Transparent generation of Assembly code from the language-side 11

12 NativeBoost Example char* getenv(const char*) 12

13 NativeBoost Example char* getenv(const char*) 13

14 NativeBoost Example Regular Smalltalk method with one argument 14

15 NativeBoost Example A pragma indicating that #primitivenativecall of #NativeBoost plugin should be executed when this method is executed 15

16 NativeBoost Example 16

17 NativeBoost Example char* getenv(const char*) types annotation used to generate marshalling code 17

18 NativeBoost Example the values to be passed when calling out 18

19 NativeBoost Example the external library address in which the function is looked up 19

20 Speed Comparisons NativeBoost Alien FFI C-FFI LuaJIT Callouts Marshalling Callbacks 20

21 Callout Evaluation Average time calling out uint clock(void) slower 150% 100% faster 50% 0% NativeBoost Alien C-FFI LuaJIT 21

22 Marshalling int int abs(int) 300% 200% 100% 0% NativeBoost Alien C-FFI LuaJIT 22

23 Marshalling char*/string 400% int printf(char*,int,int) 300% 200% 100% 0% NativeBoost Alien C-FFI LuaJIT 23

24 Marshalling char*/string 1000% char* getenv( char* ) 300% 100% NativeBoost Alien C-FFI LuaJIT 24

25 Marshalling char*/string 1000% char* getenv( char* ) 300% 100% NativeBoost Alien C-FFI LuaJIT 25

26 Marshalling structs 1000% void! cairo_matrix_multiply (! cairo_matrix_t *result,! cairo_matrix_t *a,! cairo_matrix_t *b) 400% 100% NativeBoost Alien C-FFI LuaJIT 26

27 Callbacks Evaluation void qsort (! void *base,! size_t nel,! size_t width,! int (*compare)(const void*, const void*)) 100% 30% not supported NativeBoost Alien C-FFI LuaJIT 27

28 Insights into NativeBoost Internals NBExample getenv: PATH 28

29 Insights into NativeBoost Internals NBExample getenv: PATH 29

30 Insights into NativeBoost Internals NBExample getenv: PATH NativeBoost Plugin Virtual Machine (VM) 30

31 Insights into NativeBoost Internals NBExample getenv: PATH NativeBoost Plugin Virtual Machine (VM) Fail if no native code associated with #getenv: 31

32 Insights into NativeBoost Internals NBExample getenv: PATH NativeBoost Plugin Virtual Machine (VM) 1. generate native code for marshalling, associate it with #getenv: 3. restart the method execution 32

33 Insights into NativeBoost Internals NBExample getenv: PATH NativeBoost Plugin Virtual Machine (VM) activate the native code associated with #getenv: 33

34 Conclusion NativeBoost-FFI is: Language-side: extensible, high-level code only Fast compared to other Smalltalk FFI Needs optimizations on Callbacks but that would require strong VM support 34

35 Future Work Improve NativeBoost Callback performance Reuse Alien s VM Callback support? Better integration of NativeBoost with the JIT Do not leave JIT-mode when activating a NB method 35

36 Language-side Foreign Function Interfaces with NativeBoost IWST 2013 Camillo Bruni, Luc Fabresse, Stéphane Ducasse, Igor Stasenko

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