How to debug mruby (rubyconftw2014)
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This document discusses debugging mruby code. It describes how mruby compiles Ruby code to bytecode without debugging information. The authors developed a hybrid debugger that uses GDB at the C level along with a Ruby extension to allow setting breakpoints and stepping through both Ruby and C code. They demonstrate their debugger using Eclipse and show that more features need to be added like stepping, backtraces and viewing variables. The goal is to make debugging mruby easier.
How to debug mruby (rubyconftw2014)
- 1. How to debug mrubyHow to debug mruby RubyConf.tw 2014RubyConf.tw 2014 Team YamanekkoTeam Yamanekko Yurie Yamane / Masayoshi TakahashiYurie Yamane / Masayoshi Takahashi
- 3. Who are we ● やまね ゆりえ (Yurie Yamane) ● 高橋征義 (Masayoshi Takahashi) ● ちー (Chie)
- 4. Team Yamanekko Who are we
- 12. CFP will be opened soon 公開徵求講者
- 13. our talks 到現在的經歷
- 17. Demo 演示
- 18. STM32F4的演示 Push Button Push Button Power ON blinking mode tilt sensor mode
- 20. mruby core *.rb (stdlib) *.rb (your code) C/C++ libmruby.a Bytecode (C String) mrbgems Bytecode (C String)
- 21. mruby core *.rb (stdlib) *.rb (your code) C/C++ mrbgems Ruby C
- 22. mrb_led_toggle
- 23. debugging in C → Eclipse+CDT
- 24. debugging in Ruby → ???
- 25. add breakpoint in C ● aaa ● Bbb ● mrbc breakpoint mrbgems C part in Application
- 26. add breakpoint in Ruby ● aaa ● Bbb ● mrbc breakpoint
- 28. Debug 除錯
- 31. Debugging in CRuby ● p || printf ● irb ● ruby-debug || bybug
- 32. Debugging in CRuby ● p || printf ● irb ● ruby-debug || bybug
- 33. mruby/src/vm.c
- 34. STDIO is an option in mruby
- 35. Debugging in CRuby ● p || printf ● irb ● ruby-debug || bybug
- 38. Debugging in CRuby ● p || printf ● irb ● ruby-debug || bybug
- 39. Debugging in CRuby ● p || printf ● irb ● ruby-debug || bybug mruby has no debugger (yet) – 田中先生 will develop mruby debugger (in this year?)
- 40. Issues in mruby ● embedding into C/C++ apps – mruby's code is just a part of application – We need to debug C/C++ code AND ruby code ● ruby-debug is only Ruby-level debugger – GDB && ruby-debug ??
- 41. What we want to do ● adding breakpoint in Ruby AND C ● step over/into/return in Ruby AND C ● show stacktrace in Ruby AND C ● show variable in Ruby AND C – it's different from ruby-debug
- 42. We can do them in C level https://www.sourceware.org/gdb/
- 43. our solution ● “hybrid debugger” – C-level debugger + Ruby-level extension – Ruby debugger on GDB
- 44. How to debug mrubyHow to debug mruby RubyConf.tw 2014RubyConf.tw 2014 Team YamanekkoTeam Yamanekko Yurie Yamane / Masayoshi TakahashiYurie Yamane / Masayoshi Takahashi make a debugger tomake a debugger to
- 45. Our debugger status ● just started (not finished yet Orz) ● We talk how it works, showing simple demo with gdb and Eclipse plugin
- 47. mrbc and mrubyVM *.rb *.mrb mrubyVMmrbc Compile Ruby Bytecode Execute
- 48. mrbc and mrubyVM *.rb *.mrb mrubyVMmrbc Compile Ruby Bytecode Execute mruby VM don't see original code in Ruby
- 49. bytecode structure ● We made mruby bytecode parser – mrb_parser (v0.0.1) – http://rubygems.org/gems/mrb_parser – https://github.com/yamanekko/mrb_parser
- 51. bytecode structure RITE Section (Header) IREP Section END Section IREP Record *.mrb
- 52. http://commons.wikimedia.org/wiki/File:Dialog-warning-orange.svg without -g option, mrbc doesn't generate mappings between line numbers of ruby souce code and bytecodes.
- 53. mrbc and mrubyVM *.rb *.mrb Compile Ruby Bytecode with debug section Execute mrbc -g mrbc mrubyVM
- 54. bytecode structure RITE Section(Header) IREP Section END Section IREP Record DEBUG Section DEBUG Info *.mrb corresponding
- 56. bytecode structure RITE Section IREP Section END Section IREP Record DEBUG Section DEBUG Info *.mrb corresponding
- 59. i=1+2 p i
- 60. http://commons.wikimedia.org/wiki/File:Dialog-warning-orange.svg number of byte code ≠ line number of Ruby code not 1 to 1 mapping
- 61. mruby VM
- 62. mruby VM ● src/vm.c ● mrb_context_run() ● ≒ case statements within loops
- 67. http://commons.wikimedia.org/wiki/File:Dialog-warning-orange.svg You should define ENABLE_DEBUG in mrbconf.h
- 72. GDB demo
- 73. Eclipse
- 74. Eclipse + CDT ● CDT = C/C++ Development Tooling – support various toolchains – standard make build – source navigation – various source knowledge tools
- 75. Eclipse + CDT meets mruby Eclipse Platform DSF-GDB target application (+mruby) GDB/MI DSF CDT mrubydebugger
- 76. Demo 演示
- 77. Conclusion 結語
- 78. Conclusion ● programming in mruby is fun ● debugging in mruby is hard ● making debugger is harder than that ● Cool tool helps you and makes less hard
- 79. TODO ● step into/step over ● show backtrace ● show variables
- 82. TODO ● extending *.mrb ● adding LVAR section???
- 83. Thanks! Happy mruby Hacking! special thanks to: