Rework LuCI build system

[project/luci.git] / modules / luci-base / luasrc / debug.lua

diff --git a/modules/luci-base/luasrc/debug.lua b/modules/luci-base/luasrc/debug.lua
new file mode 100644 (file)
index 0000000..8ff1bb6
--- /dev/null
+++ b/modules/luci-base/luasrc/debug.lua
@@ -0,0 +1,37 @@
+local debug = require "debug"
+local io = require "io"
+local collectgarbage, floor = collectgarbage, math.floor
+
+module "luci.debug"
+__file__ = debug.getinfo(1, 'S').source:sub(2)
+
+-- Enables the memory tracer with given flags and returns a function to disable the tracer again
+function trap_memtrace(flags, dest)
+       flags = flags or "clr"
+       local tracefile = io.open(dest or "/tmp/memtrace", "w")
+       local peak = 0
+
+       local function trap(what, line)
+               local info = debug.getinfo(2, "Sn")
+               local size = floor(collectgarbage("count"))
+               if size > peak then
+                       peak = size
+               end
+               if tracefile then
+                       tracefile:write(
+                               "[", what, "] ", info.source, ":", (line or "?"), "\t",
+                               (info.namewhat or ""), "\t",
+                               (info.name or ""), "\t",
+                               size, " (", peak, ")\n"
+                       )
+               end
+       end
+
+       debug.sethook(trap, flags)
+
+       return function()
+               debug.sethook()
+               tracefile:close()
+       end
+end
+