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----------------------------------------------------------------------------
-- LuaJIT bytecode listing module.
--
-- Copyright (C) 2005-2022 Mike Pall. All rights reserved.
-- Released under the MIT license. See Copyright Notice in luajit.h
----------------------------------------------------------------------------
--
-- This module lists the bytecode of a Lua function. If it's loaded by -jbc
-- it hooks into the parser and lists all functions of a chunk as they
-- are parsed.
--
-- Example usage:
--
-- luajit -jbc -e 'local x=0; for i=1,1e6 do x=x+i end; print(x)'
-- luajit -jbc=- foo.lua
-- luajit -jbc=foo.list foo.lua
--
-- Default output is to stderr. To redirect the output to a file, pass a
-- filename as an argument (use '-' for stdout) or set the environment
-- variable LUAJIT_LISTFILE. The file is overwritten every time the module
-- is started.
--
-- This module can also be used programmatically:
--
-- local bc = require("jit.bc")
--
-- local function foo() print("hello") end
--
-- bc.dump(foo) --> -- BYTECODE -- [...]
-- print(bc.line(foo, 2)) --> 0002 KSTR 1 1 ; "hello"
--
-- local out = {
-- -- Do something with each line:
-- write = function(t, ...) io.write(...) end,
-- close = function(t) end,
-- flush = function(t) end,
-- }
-- bc.dump(foo, out)
--
------------------------------------------------------------------------------
-- Cache some library functions and objects.
local jit = require("jit")
assert(jit.version_num == 20100, "LuaJIT core/library version mismatch")
local jutil = require("jit.util")
local vmdef = require("jit.vmdef")
local bit = require("bit")
local sub, gsub, format = string.sub, string.gsub, string.format
local byte, band, shr = string.byte, bit.band, bit.rshift
local funcinfo, funcbc, funck = jutil.funcinfo, jutil.funcbc, jutil.funck
local funcuvname = jutil.funcuvname
local bcnames = vmdef.bcnames
local stdout, stderr = io.stdout, io.stderr
------------------------------------------------------------------------------
local function ctlsub(c)
if c == "\n" then return "\\n"
elseif c == "\r" then return "\\r"
elseif c == "\t" then return "\\t"
else return format("\\%03d", byte(c))
end
end
-- Return one bytecode line.
local function bcline(func, pc, prefix)
local ins, m = funcbc(func, pc)
if not ins then return end
local ma, mb, mc = band(m, 7), band(m, 15*8), band(m, 15*128)
local a = band(shr(ins, 8), 0xff)
local oidx = 6*band(ins, 0xff)
local op = sub(bcnames, oidx+1, oidx+6)
local s = format("%04d %s %-6s %3s ",
pc, prefix or " ", op, ma == 0 and "" or a)
local d = shr(ins, 16)
if mc == 13*128 then -- BCMjump
return format("%s=> %04d\n", s, pc+d-0x7fff)
end
if mb ~= 0 then
d = band(d, 0xff)
elseif mc == 0 then
return s.."\n"
end
local kc
if mc == 10*128 then -- BCMstr
kc = funck(func, -d-1)
kc = format(#kc > 40 and '"%.40s"~' or '"%s"', gsub(kc, "%c", ctlsub))
elseif mc == 9*128 then -- BCMnum
kc = funck(func, d)
if op == "TSETM " then kc = kc - 2^52 end
elseif mc == 12*128 then -- BCMfunc
local fi = funcinfo(funck(func, -d-1))
if fi.ffid then
kc = vmdef.ffnames[fi.ffid]
else
kc = fi.loc
end
elseif mc == 5*128 then -- BCMuv
kc = funcuvname(func, d)
end
if ma == 5 then -- BCMuv
local ka = funcuvname(func, a)
if kc then kc = ka.." ; "..kc else kc = ka end
end
if mb ~= 0 then
local b = shr(ins, 24)
if kc then return format("%s%3d %3d ; %s\n", s, b, d, kc) end
return format("%s%3d %3d\n", s, b, d)
end
if kc then return format("%s%3d ; %s\n", s, d, kc) end
if mc == 7*128 and d > 32767 then d = d - 65536 end -- BCMlits
return format("%s%3d\n", s, d)
end
-- Collect branch targets of a function.
local function bctargets(func)
local target = {}
for pc=1,1000000000 do
local ins, m = funcbc(func, pc)
if not ins then break end
if band(m, 15*128) == 13*128 then target[pc+shr(ins, 16)-0x7fff] = true end
end
return target
end
-- Dump bytecode instructions of a function.
local function bcdump(func, out, all)
if not out then out = stdout end
local fi = funcinfo(func)
if all and fi.children then
for n=-1,-1000000000,-1 do
local k = funck(func, n)
if not k then break end
if type(k) == "proto" then bcdump(k, out, true) end
end
end
out:write(format("-- BYTECODE -- %s-%d\n", fi.loc, fi.lastlinedefined))
local target = bctargets(func)
for pc=1,1000000000 do
local s = bcline(func, pc, target[pc] and "=>")
if not s then break end
out:write(s)
end
out:write("\n")
out:flush()
end
------------------------------------------------------------------------------
-- Active flag and output file handle.
local active, out
-- List handler.
local function h_list(func)
return bcdump(func, out)
end
-- Detach list handler.
local function bclistoff()
if active then
active = false
jit.attach(h_list)
if out and out ~= stdout and out ~= stderr then out:close() end
out = nil
end
end
-- Open the output file and attach list handler.
local function bcliston(outfile)
if active then bclistoff() end
if not outfile then outfile = os.getenv("LUAJIT_LISTFILE") end
if outfile then
out = outfile == "-" and stdout or assert(io.open(outfile, "w"))
else
out = stderr
end
jit.attach(h_list, "bc")
active = true
end
-- Public module functions.
return {
line = bcline,
dump = bcdump,
targets = bctargets,
on = bcliston,
off = bclistoff,
start = bcliston -- For -j command line option.
}
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