mirror of
https://github.com/LuaJIT/LuaJIT.git
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Extend -b to generate c/h/obj/o files with embedded bytecode.
Supported object file formats: ELF or PE/COFF object files.
This commit is contained in:
Mike Pall
parent
aad7ea3c02
commit
a9dd47b7fc
@ -118,28 +118,56 @@ are accepted:
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<li><tt>-l</tt> — Only list bytecode.</li>
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<li><tt>-s</tt> — Strip debug info (this is the default).</li>
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<li><tt>-g</tt> — Keep debug info.</li>
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<li><tt>-n name</tt> — Set module name (default: auto-detect from input name)</li>
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<li><tt>-t type</tt> — Set output file type (default: auto-detect from output name).</li>
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<li><tt>-a arch</tt> — Override architecture for object files (default: native).</li>
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<li><tt>-o os</tt> — Override OS for object files (default: native).</li>
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<li><tt>-e chunk</tt> — Use chunk string as input.</li>
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<li><tt>-</tt> (a single minus sign) — Use stdin as input and/or stdout as output.</li>
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</ul>
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<p>
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The output file type is auto-detected from the extension of the output
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file name:
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</p>
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<ul>
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<li><tt>c</tt> — C source file, exported bytecode data.</li>
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<li><tt>h</tt> — C header file, static bytecode data.</li>
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<li><tt>obj</tt> or <tt>o</tt> — Object file, exported bytecode data
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(OS- and architecture-specific).</li>
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<li><tt>raw</tt> or any other extension — Raw bytecode file (portable).
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</ul>
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<p>
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Notes:
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</p>
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<ul>
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<li>See also <a href="extensions.html#string_dump">string.dump()</a>
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for information on bytecode portability and compatibility.</li>
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<li>A file in raw bytecode format is auto-detected and can be loaded like
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any Lua source file. E.g. directly from the command line or with
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<tt>loadfile()</tt>, <tt>dofile()</tt> etc.</li>
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<li>To statically embed the bytecode of a module in your application,
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generate an object file and just link it with your application.</li>
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<li>On most ELF-based systems (e.g. Linux) you need to explicitly export the
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global symbols when linking your application, e.g. with: <tt>-Wl,-E</tt></li>
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<li><tt>require()</tt> tries to load embedded bytecode data from exported
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symbols (in <tt>*.exe</tt> or <tt>lua51.dll</tt> on Windows) and from
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shared libraries in <tt>package.cpath</tt>.</li>
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</ul>
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<p>
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Typical usage examples:
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</p>
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<pre class="code">
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luajit -b test.lua test.out # Save to test.out
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luajit -b test.lua test.out # Save bytecode to test.out
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luajit -bg test.lua test.out # Keep debug info
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luajit -be "print('hello world')" test.out # Save cmdline script
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luajit -bl test.lua # List to stdout
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luajit -bl test.lua test.txt # List to test.txt
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luajit -ble "print('hello world')" # List cmdline script
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luajit -b test.lua test.obj # Generate object file
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# Link test.obj with your application and load it with require("test")
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</pre>
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<p>
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Note: A file in bytecode format is auto-detected and can be loaded like
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any Lua source file. E.g. directly from the command line or with
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<tt>loadfile()</tt>, <tt>dofile()</tt> etc. See also
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<a href="extensions.html#string_dump">string.dump()</a> for information
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on bytecode portability and compatibility.
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</p>
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<h3 id="opt_j"><tt>-j cmd[=arg[,arg...]]</tt></h3>
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<p>
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451
lib/bcsave.lua
451
lib/bcsave.lua
@ -10,10 +10,12 @@
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--
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------------------------------------------------------------------------------
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-- Cache some library functions and objects.
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local jit = require("jit")
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assert(jit.version_num == 20000, "LuaJIT core/library version mismatch")
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-- Symbol name prefix for LuaJIT bytecode.
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local LJBC_PREFIX = "luaJIT_BC_"
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------------------------------------------------------------------------------
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local function usage()
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@ -22,41 +24,390 @@ Save LuaJIT bytecode: luajit -b[options] input output
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-l Only list bytecode.
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-s Strip debug info (default).
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-g Keep debug info.
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-n name Set module name (default: auto-detect from input name).
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-t type Set output file type (default: auto-detect from output name).
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-a arch Override architecture for object files (default: native).
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-o os Override OS for object files (default: native).
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-e chunk Use chunk string as input.
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-- Stop handling options.
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- Use stdin as input and/or stdout as output.
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File types: c h obj o raw (default)
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]]
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os.exit(1)
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end
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local function check(ok, ...)
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if ok then return ok, ... end
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io.stderr:write("luajit: ", ...)
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io.stderr:write("\n")
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os.exit(1)
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end
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local function readfile(input)
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if type(input) == "function" then return input end
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if input == "-" then input = nil end
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local f, err = loadfile(input)
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if not f then
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io.stderr:write("luajit: ", err, "\n")
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os.exit(1)
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end
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return f
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end
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local function readstring(input)
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local f, err = loadstring(input)
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if not f then
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io.stderr:write("luajit: ", err, "\n")
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os.exit(1)
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end
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return f
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return check(loadfile(input))
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end
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local function savefile(name, mode)
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if name == "-" then return io.stdout end
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local fp, err = io.open(name, mode)
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if not fp then
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io.stderr:write("luajit: cannot write ", err, "\n")
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os.exit(1)
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return check(io.open(name, mode))
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end
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------------------------------------------------------------------------------
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local map_type = {
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raw = "raw", c = "c", h = "h", o = "obj", obj = "obj",
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}
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local map_arch = {
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x86 = true, x64 = true, arm = true, ppc = true, ppcspe = true,
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}
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local map_os = {
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linux = true, windows = true, osx = true, freebsd = true, netbsd = true,
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openbsd = true, solaris = true,
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}
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local function checkarg(str, map, err)
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str = string.lower(str)
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local s = check(map[str], "unknown ", err)
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return s == true and str or s
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end
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local function detecttype(str)
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local ext = string.match(string.lower(str), "%.(%a+)$")
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return map_type[ext] or "raw"
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end
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local function checkmodname(str)
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check(string.match(str, "^[%w_.%-]+$"), "bad module name")
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return string.gsub(str, "[%.%-]", "_")
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end
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local function detectmodname(str)
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if type(str) == "string" then
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local tail = string.match(str, "[^/\\]+$")
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if tail then str = tail end
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local head = string.match(str, "^(.*)%.[^.]*$")
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if head then str = head end
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str = string.match(str, "^[%w_.%-]+")
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else
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str = nil
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end
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check(str, "cannot derive module name, use -n name")
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return string.gsub(str, "[%.%-]", "_")
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end
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------------------------------------------------------------------------------
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local function bcsave_tail(fp, output, s)
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local ok, err = fp:write(s)
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if ok and output ~= "-" then ok, err = fp:close() end
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check(ok, "cannot write ", output, ": ", err)
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end
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local function bcsave_raw(output, s)
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local fp = savefile(output, "wb")
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bcsave_tail(fp, output, s)
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end
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local function bcsave_c(ctx, output, s)
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local fp = savefile(output, "w")
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if ctx.type == "c" then
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fp:write(string.format([[
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#ifdef _cplusplus
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extern "C"
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#endif
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#ifdef _WIN32
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__declspec(dllexport)
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#endif
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const char %s%s[] = {
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]], LJBC_PREFIX, ctx.modname))
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else
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fp:write(string.format([[
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#define %s%s_SIZE %d
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static const char %s%s[] = {
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]], LJBC_PREFIX, ctx.modname, #s, LJBC_PREFIX, ctx.modname))
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end
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local t, n, m = {}, 0, 0
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for i=1,#s do
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local b = tostring(string.byte(s, i))
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m = m + #b + 1
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if m > 78 then
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fp:write(table.concat(t, ",", 1, n), ",\n")
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n, m = 0, #b + 1
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end
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n = n + 1
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t[n] = b
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end
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bcsave_tail(fp, output, table.concat(t, ",", 1, n).."\n};\n")
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end
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local function bcsave_elfobj(ctx, output, s, ffi)
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ffi.cdef[[
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typedef struct {
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uint8_t emagic[4], eclass, eendian, eversion, eosabi, eabiversion, epad[7];
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uint16_t type, machine;
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uint32_t version;
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uint32_t entry, phofs, shofs;
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uint32_t flags;
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uint16_t ehsize, phentsize, phnum, shentsize, shnum, shstridx;
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} ELF32header;
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typedef struct {
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uint8_t emagic[4], eclass, eendian, eversion, eosabi, eabiversion, epad[7];
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uint16_t type, machine;
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uint32_t version;
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uint64_t entry, phofs, shofs;
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uint32_t flags;
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uint16_t ehsize, phentsize, phnum, shentsize, shnum, shstridx;
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} ELF64header;
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typedef struct {
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uint32_t name, type, flags, addr, ofs, size, link, info, align, entsize;
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} ELF32sectheader;
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typedef struct {
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uint32_t name, type;
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uint64_t flags, addr, ofs, size;
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uint32_t link, info;
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uint64_t align, entsize;
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} ELF64sectheader;
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typedef struct {
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uint32_t name, value, size;
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uint8_t info, other;
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uint16_t sectidx;
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} ELF32symbol;
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typedef struct {
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uint32_t name;
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uint8_t info, other;
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uint16_t sectidx;
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uint64_t value, size;
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} ELF64symbol;
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typedef struct {
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ELF32header hdr;
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ELF32sectheader sect[6];
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ELF32symbol sym[2];
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uint8_t space[4096];
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} ELF32obj;
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typedef struct {
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ELF64header hdr;
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ELF64sectheader sect[6];
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ELF64symbol sym[2];
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uint8_t space[4096];
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} ELF64obj;
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]]
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local symname = LJBC_PREFIX..ctx.modname
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local is64, isbe = false, false
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if ctx.arch == "x64" then
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is64 = true
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elseif ctx.arch == "ppc" or ctx.arch == "ppcspe" then
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isbe = true
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end
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-- Handle different host/target endianess.
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local function f32(x) return x end
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local f16, fofs = f32, f32
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if ffi.abi("be") ~= isbe then
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f32 = bit.bswap
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function f16(x) return bit.rshift(bit.bswap(x), 16) end
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if is64 then
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function fofs(x) return bit.bswap(x)*(2ll^32) end
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else
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fofs = f32
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end
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end
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-- Create ELF object and fill in header.
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local o = ffi.new(is64 and "ELF64obj" or "ELF32obj")
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local hdr = o.hdr
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if ctx.os == "bsd" or ctx.os == "other" then -- Determine native hdr.eosabi.
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local bf = assert(io.open("/bin/ls", "rb"))
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local bs = bf:read(9)
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bf:close()
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ffi.copy(o, bs, 9)
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check(hdr.emagic[0] == 127, "no support for writing native object files")
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else
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hdr.emagic = "\127ELF"
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hdr.eosabi = ({ freebsd=9, netbsd=2, openbsd=12, solaris=6 })[ctx.os] or 0
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end
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hdr.eclass = is64 and 2 or 1
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hdr.eendian = isbe and 2 or 1
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hdr.eversion = 1
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hdr.type = f16(1)
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hdr.machine = f16(({ x86=3, x64=62, arm=40, ppc=20, ppcspe=20 })[ctx.arch])
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hdr.version = f32(1)
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hdr.shofs = fofs(ffi.offsetof(o, "sect"))
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hdr.ehsize = f16(ffi.sizeof(hdr))
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hdr.shentsize = f16(ffi.sizeof(o.sect[0]))
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hdr.shnum = f16(6)
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hdr.shstridx = f16(2)
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-- Fill in sections and symbols.
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local sofs, ofs = ffi.offsetof(o, "space"), 1
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for i,name in ipairs{
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".symtab", ".shstrtab", ".strtab", ".rodata", ".note.GNU-stack",
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} do
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local sect = o.sect[i]
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sect.align = fofs(1)
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sect.name = f32(ofs)
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ffi.copy(o.space+ofs, name)
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ofs = ofs + #name+1
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end
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o.sect[1].type = f32(2) -- .symtab
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o.sect[1].link = f32(3)
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o.sect[1].info = f32(1)
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o.sect[1].align = fofs(8)
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o.sect[1].ofs = fofs(ffi.offsetof(o, "sym"))
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o.sect[1].entsize = fofs(ffi.sizeof(o.sym[0]))
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o.sect[1].size = fofs(ffi.sizeof(o.sym))
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o.sym[1].name = f32(1)
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o.sym[1].sectidx = f16(4)
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o.sym[1].size = fofs(#s)
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o.sym[1].info = 17
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o.sect[2].type = f32(3) -- .shstrtab
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o.sect[2].ofs = fofs(sofs)
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o.sect[2].size = fofs(ofs)
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o.sect[3].type = f32(3) -- .strtab
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o.sect[3].ofs = fofs(sofs + ofs)
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o.sect[3].size = fofs(#symname+1)
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ffi.copy(o.space+ofs+1, symname)
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ofs = ofs + #symname + 2
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o.sect[4].type = f32(1) -- .rodata
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o.sect[4].flags = fofs(2)
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o.sect[4].ofs = fofs(sofs + ofs)
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o.sect[4].size = fofs(#s)
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o.sect[5].type = f32(1) -- .note.GNU-stack
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o.sect[5].ofs = fofs(sofs + ofs + #s)
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-- Write ELF object file.
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local fp = savefile(output, "wb")
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fp:write(ffi.string(o, ffi.sizeof(o)-4096+ofs))
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bcsave_tail(fp, output, s)
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end
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local function bcsave_peobj(ctx, output, s, ffi)
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ffi.cdef[[
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typedef struct {
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uint16_t arch, nsects;
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uint32_t time, symtabofs, nsyms;
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uint16_t opthdrsz, flags;
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} PEheader;
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typedef struct {
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char name[8];
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uint32_t vsize, vaddr, size, ofs, relocofs, lineofs;
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uint16_t nreloc, nline;
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uint32_t flags;
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} PEsection;
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typedef struct __attribute((packed)) {
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union {
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char name[8];
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uint32_t nameref[2];
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};
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uint32_t value;
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int16_t sect;
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uint16_t type;
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uint8_t scl, naux;
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} PEsym;
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typedef struct __attribute((packed)) {
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uint32_t size;
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uint16_t nreloc, nline;
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uint32_t cksum;
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uint16_t assoc;
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uint8_t comdatsel, unused[3];
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} PEsymaux;
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typedef struct {
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PEheader hdr;
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PEsection sect[2];
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// Must be an even number of symbol structs.
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PEsym sym0;
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PEsymaux sym0aux;
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PEsym sym1;
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PEsymaux sym1aux;
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PEsym sym2;
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PEsym sym3;
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uint32_t strtabsize;
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uint8_t space[4096];
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} PEobj;
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]]
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local symname = LJBC_PREFIX..ctx.modname
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local is64, isbe = false, false
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if ctx.arch == "x86" then
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symname = "_"..symname
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elseif ctx.arch == "x64" then
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is64 = true
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elseif ctx.arch == "ppc" or ctx.arch == "ppcspe" then
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isbe = true
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end
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local symexport = " /EXPORT:"..symname..",DATA "
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-- Handle different host/target endianess.
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local function f32(x) return x end
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local f16 = f32
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if ffi.abi("be") ~= isbe then
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f32 = bit.bswap
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function f16(x) return bit.rshift(bit.bswap(x), 16) end
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end
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-- Create PE object and fill in header.
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local o = ffi.new("PEobj")
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local hdr = o.hdr
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hdr.arch = f16(({ x86=0x14c, x64=0x8664, arm=0x1c0, ppc=0x1f1 })[ctx.arch])
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hdr.nsects = f16(2)
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hdr.symtabofs = f32(ffi.offsetof(o, "sym0"))
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||||
hdr.nsyms = f32(6)
|
||||
|
||||
-- Fill in sections and symbols.
|
||||
o.sect[0].name = ".drectve"
|
||||
o.sect[0].size = f32(#symexport)
|
||||
o.sect[0].flags = f32(0x00100a00)
|
||||
o.sym0.sect = f16(1)
|
||||
o.sym0.scl = 3
|
||||
o.sym0.name = ".drectve"
|
||||
o.sym0.naux = 1
|
||||
o.sym0aux.size = f32(#symexport)
|
||||
o.sect[1].name = ".rdata"
|
||||
o.sect[1].size = f32(#s)
|
||||
o.sect[1].flags = f32(0x40300040)
|
||||
o.sym1.sect = f16(2)
|
||||
o.sym1.scl = 3
|
||||
o.sym1.name = ".rdata"
|
||||
o.sym1.naux = 1
|
||||
o.sym1aux.size = f32(#s)
|
||||
o.sym2.sect = f16(2)
|
||||
o.sym2.scl = 2
|
||||
o.sym2.nameref[1] = f32(4)
|
||||
o.sym3.sect = f16(-1)
|
||||
o.sym3.scl = 2
|
||||
o.sym3.value = f32(1)
|
||||
o.sym3.name = "@feat.00" -- Mark as SafeSEH compliant.
|
||||
ffi.copy(o.space, symname)
|
||||
local ofs = #symname + 1
|
||||
o.strtabsize = f32(ofs + 4)
|
||||
o.sect[0].ofs = f32(ffi.offsetof(o, "space") + ofs)
|
||||
ffi.copy(o.space + ofs, symexport)
|
||||
ofs = ofs + #symexport
|
||||
o.sect[1].ofs = f32(ffi.offsetof(o, "space") + ofs)
|
||||
|
||||
-- Write PE object file.
|
||||
local fp = savefile(output, "wb")
|
||||
fp:write(ffi.string(o, ffi.sizeof(o)-4096+ofs))
|
||||
bcsave_tail(fp, output, s)
|
||||
end
|
||||
|
||||
local function bcsave_machobj(ctx, output, s, ffi)
|
||||
check(false, "NYI: no support for writing OSX object files")
|
||||
end
|
||||
|
||||
local function bcsave_obj(ctx, output, s)
|
||||
local ok, ffi = pcall(require, "ffi")
|
||||
check(ok, "FFI library required to write this file type")
|
||||
if ctx.os == "windows" then
|
||||
return bcsave_peobj(ctx, output, s, ffi)
|
||||
elseif ctx.os == "osx" then
|
||||
return bcsave_machobj(ctx, output, s, ffi)
|
||||
else
|
||||
return bcsave_elfobj(ctx, output, s, ffi)
|
||||
end
|
||||
return fp
|
||||
end
|
||||
|
||||
------------------------------------------------------------------------------
|
||||
@ -66,15 +417,23 @@ local function bclist(input, output)
|
||||
require("jit.bc").dump(f, savefile(output, "w"), true)
|
||||
end
|
||||
|
||||
local function bcsave(input, output, strip)
|
||||
local function bcsave(ctx, input, output)
|
||||
local f = readfile(input)
|
||||
local s = string.dump(f, strip)
|
||||
local fp = savefile(output, "wb")
|
||||
local ok, err = fp:write(s)
|
||||
if ok and output ~= "-" then ok, err = fp:close() end
|
||||
if not ok then
|
||||
io.stderr:write("luajit: cannot write ", arg[2], ": ", err, "\n")
|
||||
os.exit(1)
|
||||
local s = string.dump(f, ctx.strip)
|
||||
local t = ctx.type
|
||||
if not t then
|
||||
t = detecttype(output)
|
||||
ctx.type = t
|
||||
end
|
||||
if t == "raw" then
|
||||
bcsave_raw(output, s)
|
||||
else
|
||||
if not ctx.modname then ctx.modname = detectmodname(input) end
|
||||
if t == "obj" then
|
||||
bcsave_obj(ctx, output, s)
|
||||
else
|
||||
bcsave_c(ctx, output, s)
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
@ -82,27 +441,41 @@ local function docmd(...)
|
||||
local arg = {...}
|
||||
local n = 1
|
||||
local list = false
|
||||
local strip = true
|
||||
local ctx = {
|
||||
strip = true, arch = jit.arch, os = string.lower(jit.os),
|
||||
type = false, modname = false,
|
||||
}
|
||||
while n <= #arg do
|
||||
local a = arg[n]
|
||||
if type(a) == "string" and string.sub(a, 1, 1) == "-" and a ~= "-" then
|
||||
if a == "--" then table.remove(arg, n); break end
|
||||
table.remove(arg, n)
|
||||
if a == "--" then break end
|
||||
for m=2,#a do
|
||||
local opt = string.sub(a, m, m)
|
||||
if opt == "l" then
|
||||
list = true
|
||||
elseif opt == "s" then
|
||||
strip = true
|
||||
ctx.strip = true
|
||||
elseif opt == "g" then
|
||||
strip = false
|
||||
elseif opt == "e" then
|
||||
if n ~= 1 or #arg < 2 or m ~= #a then usage() end
|
||||
arg[2] = readstring(arg[2])
|
||||
ctx.strip = false
|
||||
else
|
||||
usage()
|
||||
if arg[n] == nil or m ~= #a then usage() end
|
||||
if opt == "e" then
|
||||
if n ~= 1 then usage() end
|
||||
arg[1] = check(loadstring(arg[1]))
|
||||
elseif opt == "n" then
|
||||
ctx.modname = checkmodname(table.remove(arg, n))
|
||||
elseif opt == "t" then
|
||||
ctx.type = checkarg(table.remove(arg, n), map_type, "file type")
|
||||
elseif opt == "a" then
|
||||
ctx.arch = checkarg(table.remove(arg, n), map_arch, "architecture")
|
||||
elseif opt == "o" then
|
||||
ctx.os = checkarg(table.remove(arg, n), map_os, "OS name")
|
||||
else
|
||||
usage()
|
||||
end
|
||||
end
|
||||
end
|
||||
table.remove(arg, n)
|
||||
else
|
||||
n = n + 1
|
||||
end
|
||||
@ -112,7 +485,7 @@ local function docmd(...)
|
||||
bclist(arg[1], arg[2] or "-")
|
||||
else
|
||||
if #arg ~= 2 then usage() end
|
||||
bcsave(arg[1], arg[2], strip)
|
||||
bcsave(ctx, arg[1], arg[2])
|
||||
end
|
||||
end
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user