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libs/core: optimize strip_bytecode() memory usage by avoiding string concatenation

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This commit is contained in:
Jo-Philipp Wich 2009-07-10 16:30:43 +00:00
parent 3fac200364
commit 128437f671
1 changed files with 8 additions and 7 deletions
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15
libs/core/luasrc/util.lua
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@ -554,10 +554,10 @@ function strip_bytecode(code)
end end
end end
local strip_function local function strip_function(code)
strip_function = function(code)
local count, offset = subint(code, 1, size) local count, offset = subint(code, 1, size)
local stripped, dirty = string.rep("\0", size), offset + count local stripped = { string.rep("\0", size) }
local dirty = offset + count
offset = offset + count + int * 2 + 4 offset = offset + count + int * 2 + 4
offset = offset + int + subint(code, offset, int) * ins offset = offset + int + subint(code, offset, int) * ins
count, offset = subint(code, offset, int) count, offset = subint(code, offset, int)
@ -575,10 +575,11 @@ function strip_bytecode(code)
end end
end end
count, offset = subint(code, offset, int) count, offset = subint(code, offset, int)
stripped = stripped .. code:sub(dirty, offset - 1) stripped[#stripped+1] = code:sub(dirty, offset - 1)
for n = 1, count do for n = 1, count do
local proto, off = strip_function(code:sub(offset, -1)) local proto, off = strip_function(code:sub(offset, -1))
stripped, offset = stripped .. proto, offset + off - 1 stripped[#stripped+1] = proto
offset = offset + off - 1
end end
offset = offset + subint(code, offset, int) * int + int offset = offset + subint(code, offset, int) * int + int
count, offset = subint(code, offset, int) count, offset = subint(code, offset, int)
@ -589,8 +590,8 @@ function strip_bytecode(code)
for n = 1, count do for n = 1, count do
offset = offset + subint(code, offset, size) + size offset = offset + subint(code, offset, size) + size
end end
stripped = stripped .. string.rep("\0", int * 3) stripped[#stripped+1] = string.rep("\0", int * 3)
return stripped, offset return table.concat(stripped), offset
end end
return code:sub(1,12) .. strip_function(code:sub(13,-1)) return code:sub(1,12) .. strip_function(code:sub(13,-1))