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src/jit/zone.lua - luajit-2.0-src

Functions defined

Source code

  1. ----------------------------------------------------------------------------
  2. -- LuaJIT profiler zones.
  3. --
  4. -- Copyright (C) 2005-2015 Mike Pall. All rights reserved.
  5. -- Released under the MIT license. See Copyright Notice in luajit.h
  6. ----------------------------------------------------------------------------
  7. --
  8. -- This module implements a simple hierarchical zone model.
  9. --
  10. -- Example usage:
  11. --
  12. --   local zone = require("jit.zone")
  13. --   zone("AI")
  14. --   ...
  15. --     zone("A*")
  16. --     ...
  17. --     print(zone:get()) --> "A*"
  18. --     ...
  19. --     zone()
  20. --   ...
  21. --   print(zone:get()) --> "AI"
  22. --   ...
  23. --   zone()
  24. --
  25. ----------------------------------------------------------------------------

  27. local remove = table.remove

  29. return setmetatable({
  30. ‌  flush = function(t)
  31.     for i=#t,1,-1 do t[i] = nil end
  32.   end,
  33. ‌  get = function(t)
  34.     return t[#t]
  35.   end
  36. }, {
  37. ‌  __call = function(t, zone)
  38.     if zone then
  39.       t[#t+1] = zone
  40.     else
  41.       return (assert(remove(t), "empty zone stack"))
  42.     end
  43.   end
  44. })

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