xref: /external/chromium_org/v8/tools/gcmole/gccause.lua

-- Copyright 2011 the V8 project authors. All rights reserved.
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are
-- met:
--
--     * Redistributions of source code must retain the above copyright
--       notice, this list of conditions and the following disclaimer.
--     * Redistributions in binary form must reproduce the above
--       copyright notice, this list of conditions and the following
--       disclaimer in the documentation and/or other materials provided
--       with the distribution.
--     * Neither the name of Google Inc. nor the names of its
--       contributors may be used to endorse or promote products derived
--       from this software without specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-- OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

-- This is an auxiliary tool that reads gccauses file generated by
-- gcmole.lua and prints tree of the calls that can potentially cause a GC
-- inside a given function.
--
-- Usage: lua tools/gcmole/gccause.lua <function-name-pattern>
--

assert(loadfile "gccauses")()

local P = ...

local T = {}

local function TrackCause(name, lvl)
   io.write(("  "):rep(lvl or 0), name, "\n")
   if GC[name] then
      local causes = GC[name]
      for i = 1, #causes do
	 local f = causes[i]
	 if not T[f] then
	    T[f] = true
	    TrackCause(f, (lvl or 0) + 1)
	 end

	 if f == '<GC>' then break end
      end
   end
end

for name, _ in pairs(GC) do
   if name:match(P) then
      T = {}
      TrackCause(name)
   end
end