Luajit string dump. dump does not only dump the single function like it implies.

• Luajit string dump Post by Nicolas My game currently handles its savefiles as a serialization of the running objects, since some objects can have functions dynamically attached to them it needs Bytecode is a precompiled script exported in simple form to be read by LuaJIT back faster. Contribute to cloudflare/loom development by creating an account on GitHub. At first glance, I though it would be no -- The following dump features are available (* marks the default): -- * t Print a line for each started, ended or aborted trace (see also -jv). Magic1: optimized out? Your program is normally compiled in optimized mode (e. gc of course). This library is typically used for quick debugging values to the terminal where one would use print but want more information about the value (like table content), output to stderr by default (or other file handle) and optionally time elapsed. 0 and 2. Crypto OpenResty's Branch of LuaJIT 2. Details for the bytecode dump format can be found in f — Dump the function name if it can be derived. intv: LuaJIT bytecode dump format is produced using luajit -b or string. After much investigation, I decided to write these programs in Lua - more exactly LuaJIT, a highly optimized implementation of the original Lua 5. * Library; Lua/C API; Profiler; Status; FAQ; Mailing List; Sponsors; This is the common project page for: LuaJIT — a Just-In-Time Compiler for Lua. 1 at the linker/dynamic loader level. An extra argument has been added to string. dump(func, mode), fixup) defs[#defs+1] = name. On !DUALNUM builds, buildvm_lib. gitignore","contentType":"file"},{"name":"bc. -O2), sometimes even without debug info! The means by which host-endianness is detected is, at present, implementation specific. c FFI library lib init. new Greetings wonderful LuaJIT hackers! I have a juicy question for you all :-). byte. every. g. By dumping a function to a string and then reloading it you've created a clone of the function: LuaJIT does provite an implementation of debug. dump function returns a binary representation of a function as a string. 1-2 Depends: String utilities and common hash functions for ngx_lua and LuaJIT - openresty/lua-resty-string Post by Mike Pall LuaJIT 2. All other characters are added verbatim to the output string. gitignore","path":"src/jit/. I'm trying to achieve the same with luaJIT, using "luajit -b" and several files, but couldn't get it done there. dump generates portable bytecode on LuaJIT: The generated bytecode is portable and can be loaded on any architecture that LuaJIT supports, independent of word size or endianess. Under luaJIT, it uses the ffi library (specifically, the ffi. The bytecode can be listed with luajit -bl, see the -b option. On DUALNUM builds, this gets turned into BC_ISTYPE int. loadpath (path) Parse the XML content of the file at path and return a lua table. LuaJIT has been successfully used as a scripting middleware in games, appliances, network and graphics apps, numerical simulations, trading platforms and many other specialty applications. find 对应的编译状态是 2. The int *len argument returns the length of the output string. 1, the table. 5 code that dump the same function to find out the differences (obfuscated opcodes) but how do I go from there to reverse the opcodes so that I can produce somewhat readable code with decompiling tools How to read luajit byte code, and how to convert it into normal lua script to make some changes, or to see some procedures from the code. So far, all that I tried were either dead or I could produce only zlib compressed strings. What is the fastest way to check that? I would like to avoid string interning here: The parallel jobs feature is very useful for the valgrind test mode. There's no luac. Inspecting the hex dump I found that the opcode is interpreted from version 1, which is 2 slots shift from opcode array. 3). The backtrace format is the same as the Subject: luajit 2. 1 Status ===== Development on LuaJIT 2. DynASM — a Dynamic Assembler for code generation engines. GetStr() return ffi. But when I try to convert it back to original text it shows below result. out","wb")) assert(f:write(string. c Package library lib debug. One of those fields is of type size_t, that makes bytecode incompatible not only between hosts with different endianness, but also between 32- and 64-bit systems. dump()` dump lua table to json file. Business, Economics, and Finance. It always returns the same string with a length of 12 characters. ulua 底层库编译工程，PC\\Andriod基于luajit2. dump works perfectly fine in studio. Given this, if print_r is insufficient, so is json_encode. jit/bcsave. y would be compatibvble, 2. Right now the wiki is pretty thin (but is always looking for people to add to it), however, one great page that was added recently is a list of NYI functions. upvaluejoin though, so that may handle any Lua runtimes you run code in. Provided API: - `rapidjson. I referenced lj_bc. Ok, I will explain it once more. tStr = {"String1", "String2", "String3"} How do I pass to C function. Unlike Lua strings, which are constants, string buffers are mutable sequences of 8-bit (binary-transparent) characters. However the bytecode compatibility versions must match. It serves as a cdata constructor when called. fixes dump return Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company For method DumpMemorySnapshot the last 2 parameters is the root object name and the root object to search from, with default value "registry" and "debug. c in luaJIT and the bytecode format differs, so I'm wondering if However, you should look at the the command-line options of LuaJIT itself of use, there are ones for dumping out the bytecode listing, or dumping out C/h/obj/o files of bytecode, both of which can be used to do what you want. So yes, you can load byte code with luaL_loadfile just like before. 1 functions in Lua 5. Z — Zap the following characters for the last dumped frame. With appropriate defaults. dump does not only dump the single function like it implies. It can be saved to file and loaded later, instead of storing plain Lua source, occupying more space and taking longer to load. lua","path Apparently string. 1 representation is different from lua 5. A single bytecode instruction is 32 bit wide and has an 8 bit opcode field and several operand fields of 8 or 16 bit. Bytes[5] = 42 -- create string containing 64-bit address local string_to_send = tostring(ffi. -- Dump the as-written evil function to bytecode: local estr = string. The backtrace format is the same as the one used by the lj-lua-bt tool. defs[name] = fixup_dump(string. 1. Contribute to LuaJIT/LuaJIT development by creating an account on GitHub. Permalink. - `rapidjson. GameStop Moderna Pfizer Johnson & Johnson AstraZeneca Walgreens Best Buy Novavax SpaceX Tesla. The difference is that you can't use luaL_loadstring with byte code. match was called ? It seems the pointer to the string to be manipulated is not valid, maybe already freed. c Debug library lib bit. dump (f) assert (loadstring (s)) --> hello, world Note: this does not currently work if you are using the LuaJIT DLL instead of the one that ships with the normal MUSHclient download. 1 VM developed by a single person, Mike Pall, who - based on his work - seems to be nothing short The traditional way of inspecting such Lua data is to expose special APIs that serialize and dump out the corresponding Lua data. Instant dev string. string. 0. lua' now produces bytecode dumps You should strip debug info from dumps before comparing: string. It can be saved to file and loaded later, instead of storing plain Lua source, occupying more space and taking --The following dump features are available (* marks the default): -- * t Print a line for each started, ended or aborted trace (see also -jv). For example, table. This should mean that LuaJIT C parser supports string literals! Let's try: string. Under standard lua, it uses string. table or directly as parameters of effil. DEPRECATED after the switch to rolling releases. Based on the very fast json library RapidJSON. When analyzing ngx_lua's processes, this tool requires the Python module files nginx. The compilation state of string. sub: yes With LuaJIT 2. To redirect output to a file, -- pass a filename as an argument or set the environment variable -- "LUAJIT_DUMPFILE". lua: Extend this with -W and -X flags and merge this together with ctx. Glossary. Sign in BCDUMP_KTAB_STR(=5) - String(string length = TYPE - BCDUMP_KTAB_STR) ktabkbuffer: BYTE[TYPE-BCDUMP_KTAB_STR] Constant table value(or key) string. 2. When trying to reverse a LuaJIT Dump with version 2 in header, I noticed that luajit-x -bx gave me a different result with luajit. function mymodule. There is also compat-env module that implements Lua 5. dump(function, strip) variant, where debug symbols get stripped if the second argument is true; and it can be loaded on all supported (by luajit) architectures as long as the luajit minor/major version is the same. Skip to content. return defs. See src/lj_bc. Look to the page you've linked: every 7byte string you push to Lua will consume 135 cycle with SSE2 on 32bit platform and 61 cycle on 64bit platform - it is huge amount of CPU time. 1 partial: Not Mirror of the LuaJIT git repository. dump(assert(loadfile("foo. 1~bpo22. 1, strung. load()` load json file into lua table. version_num. c Library initialization Makefile LuaJIT Make le ljamalg. So everything in the current context of the state will be recorded to some degree (the func, upvals, params, etc. Contribute to openresty/luajit2 development by creating an account on GitHub. As of now, there are no plans to support On the official LuaJIT website one can read the following: The C parser complies to the C99 language standard plus the following extensions: - The '\e' escape in character and string literals. dump on an empty function and checks the bytecode header. Please don't complain about the I have met some segmentation fault with luajit 2. This speeds up later bytecode loading and reduces memory LuaJIT bytecode dump format is produced using luajit -b or string. lib_string. Try for instance. malloc(ffi. Instructions come in one of two formats: string. LuaJIT has only a single stand-alone executable, Otherwise the value is passed as the first argument (a string). dump becomes] a strip flags that indicated to >> strip the debug information of chunk or not. a pure Lua implementation of the bytecode editing). To get information about a function you push it onto the stack and start the what string with the character '>'. The backtrace is printed as below. The buffer is It should come as no surprise that LuaJIT (as opposed to plain PUC-Rio non-JIT Lua) also has bytecode which can be used to escape from sandboxes, but it is nevertheless illustrative to work through the details of a full sandbox escape. I think the easiest way to accomplish this would be to have the C code return a struct containing an array of strings and a length to Lua and write a little Lua to reify it to your desired data structure. Sometimes I have intuitions for when side-traces or root-traces are m This optimization only applies to Intel CPUs supporting the SSE 4. remove functions are implemented in (extended) bytecode, making use of CHECK_int. dump(), and default value for sort_keys is false. If it doesn't contain any line break, is interpreted as a pathname to read the template from a text file. Lua has heuristics to detect that a "string" it is given is a Lua source string or byte code. In case this is a LuaJIT binary, where do I start about decompiling it? The LuaJIT Language Toolkit is an implementation of the Lua programming language written in Lua itself. dump() is portable: The generated bytecode is portable and can be loaded on any architecture that LuaJIT supports, independent of word size or endianess. I was trying some lua decompilers, but each of them says that code is not lua byte code, and I know that yes. That function expects a NULL-terminated string, which is bad. Otherwise leave it as is. object() and rapidjson. So for example if I have . Contribute to Drecik/luajitgen development by creating an account on GitHub. c JIT library lib ffi. luac files) - RedHolms/LuaJIT-BytecodeDumpFormat. In v2. dump(f1, true) == string. c Bit manipulation library lib jit. , it will not be optimized with JIT and will fall back to interpreter mode. The exdata pointer is initialized to NULL when the main thread is created. The simplest obfuscation option is to compile your Lua code as others suggested, however it has two major issues: (1) the strings are still likely to be easily visible in your compiled code, and (2) the compiled code for Lua interpreter is not portable, so if you target different architectures, you need to have different compiled chunks for them. os LuaJIT has only a single stand-alone executable, called luajit on POSIX systems or luajit. In short - you must use Lua You probably want to write a Lua program that runs in LuaJIT. This function returns a const char * pointing to a private string buffer of the profiler. move and table. ) Dumps a function as a binary chunk OpenResty XRay provides standard analyzers for the following application types or stack stacks (the list is still growing fast). 1 is to use Suppose you want to interpret the string fromt he above example (abcd) as big endian; then you could do this. 4的分代移植到luajit中，只通过jit. The segmentation fault happened when string. However, the reality is complex. luaand run it from the command line: SipHash is too slow (for LuaJIT). abi function). c: In string. Now this new file will give me an IllegalState exception from unluac and when I try to run the bytecode file (created by the code line above) in luac with the -l option I am trying to convert a script to binary representation using string. Have you read Lua 5. F — Ditto, but dump module:name. The result was positive. I can probly inject standard lua code and have the custom luajit string. But if you want to search from another object e. g A long time ago, I wrote about dumping manually an SLC NAND Flash device. Like, call loadfile to load the bytecode and string. local union do if ffi. 0. luajit bytecode is, as I recall, much more optimized and has a variety of output formats (that, as indicated by -t raw, is the "raw" output format). py to 将lua5. Data can be stored, formatted and encoded into a string buffer and later converted, extracted or decoded. Coco — a Lua extension for True C Coroutines. For. dump(evil, true) local buf = ffi. Sign in Product Actions. directly from Further note: Using string. dump function. 1, which means it has been supported since LuaJIT 2. dump on the function and pass the results to the callback constructor. dump调用，可以得到字节码文件，再通过与标准的luajit生成的字节码文件比对，即可找出差异所在。Lua脚本中的string. h in the LuaJIT source code for details. LuaJIT has only a single stand-alone executable, called luajit on POSIX systems or luajit. 4，MAC\\iOS\\WinPhone基于luavm - jarjin/ulua_runtime file:write(string. ; Added rapidjson. readelf -A kindle/koreader/luajit Attribute Section: aeabi File Attributes Tag_CPU_name: "7-A" Tag_CPU_arch: v7 Tag_CPU_arch_profile: Application Tag_ARM_ISA_use: Yes Tag_THUMB_ISA_use: Thumb-2 Tag_FP_arch: VFPv3 Tag_Advanced_SIMD_arch: NEONv1 Tag_ABI_PCS_wchar_t: 4 Tag_ABI_FP_rounding: Needed Tag_ABI_FP_denormal: Needed Subject: Re: luajit 2. The depth argument gives the number of frames to dump, starting at the topmost frame I've hacked a way by creating new function chunks based on string. 1 开始部分支持，后面的备注中写的是 只支持搜索固定的字符串，不支持模式匹配。 LuaJIT very recently launched its own wiki and mailing list, and with such things comes many, many more gems about speeding up code for LuaJIT. string(c_str) end If you are getting a crash, then make sure that your C string is null terminated and, in your case, has at most 31 characterss (so as to not overflow its buffer). 1 and Lua 5. 2 and vice versa. typeof(). -- * b Dump the traced bytecode. encode()` encode lua table to json string. Version xx. concat(byte_code_tab,',') How can I extract a LuaJIT call stack and other debug info given a core dump from a customer's machine? [1] Ideally I'd use the built-in C debug APIs, but that doesn't seem Which means the ID 82 corresponds to the "string. Is it possible to locate where the Lua code is executed according to the core dump? (gdb) bt LuaJIT is also fully ABI-compatible to Lua 5. The best alternative for Lua 5. off()模式下的测试. It doesn't give the prettiest formatting in the output but for such a simple function it's hard to beat for debugging. This means you can compile a C module against the standard Lua headers and load the same shared library from either Lua or LuaJIT. thread. The following document describes the LuaJIT 2. Such a patch was made in [2] and also suggested in [3] along with workarounds (e. This function allows taking stack dumps in an efficient manner. Navigation Menu Toggle navigation. An extra argument has been added to string. (pseudocode): ffi. io, os, string, table, math, debug are standard Lua modules defined by the Lua 5. In simple words, it links all allocated gc objects in a global list. -j dump[=file] — Dump machine code after (Although luajit adds a string. cast("EncryptionKeys&", ffi. 1 partial，意思是从 LuaJIT 2. Kartik Agaram. However, the Many thanks! Good that with the original Lua this will work. dump(loadfile(filename))) I get a different output than with luac, however they are very much the same being only a byte extra at (a lot of) different places. format: 2. The important thing is that LuaJIT's bytecode is compatible with standard Lua and still offers the same bytecode dumping facilities. As a test, if you dump the compressed string to a file, zcat should be able to decompress it. String files: The string. dump" builtin. GitHub Gist: instantly share code, notes, and snippets. Host and manage packages Security. This page describes the detailed semantics underlying the FFI library and its interaction with both Lua and C code. The IDs of builtins might be different among different versions of LuaJIT, so ensure you are using the Lua is a managed language which has a garbage collector, me and AVX are looking for where they collect strings so we can dump all string info before it gets collected thus holding decrypted strings :) LuaJIT is a little bit diff from normal Lua so it takes us a bit to find All that was needed was to clone the LuaJIT repository, locate the Effil allows to transmit data between threads (Lua interpreter states) using effil. The callback object must A very fast json module for LuaJIT 2. Both cases will use the same luaU_dump() at the end. Default type. dump函数用于生成字节码文件，根据对 luajit -b命令的分析可以得出，最终dump In LuaJIT identifiers are allowed to consist of non-ASCII bytes (128-255), such variable names may indeed look like a random binary strings. reverse: no: Compiled in LuaJIT 2. ). He also stated that print_R is provides insufficient information for his needs. It's not a stated goal to compile everything, since the interpreter is fast enough for many tasks. Mirror of the LuaJIT git repository. You can do it from Lua without luac using string. array() just set metatable field __jsontype to 'object' and 'array' if passed table already have a metatable. dump(f2, true). org> Architecture: amd64 Multi-Arch: same Source: luajit Version: 2. Overview. There is no editBytecode function, and no "how to hack bytecode" tutorial that I know of, so you gonna have to read documentation and source code to learn what each byte in the Description of LuaJIT compiler bytecode dump format(. Single code bytes can be accessed with string. Contains the LuaJIT version string. Parser with the xml. Here are the built-in LuaJIT control commands: -j on — Turns the JIT engine on (default). dump and load*. I haven't read the Gems book The remaining results are strings for CPU-specific features and enabled optimizations. -- Note: The file is overwritten each time you run luajit. Otherwise, use module:line. Rename module to rapidjson. function. The string tmpl is a report template using the template syntax described below. end. # APISIX OpenResty XRay provides the following tools for analyzing APISIX applications: GopherLua is a Lua5. No matter what I do, I can't seem to make an automatic source-code deleter that deletes the source from the returned string- It doesn't seem to be passed as-is, I don't know whether it removes my indenting, new lines, spaces, or it A small library for dumping lua variables quickly. I happened to get a firmware with lots of Lua scripts. 2 instruction sets. py and ngxlua. This speeds up later bytecode loading and reduces memory usage. Given that the FFI library is designed to interface with C code and that declarations can be written in plain C syntax, it closely follows the C language semantics, wherever possible. If neither of these is available, it emits a warning and assumes little-endian. 1, so you can use it safely. (2. You can also save the file below as luac. abi('le') then union = union_type { bytes = ('abcd'):reverse() } else union = union_type { bytes = 'abcd' } end end If the system is little endian, reverse the string. x and 2. "_G", you can set it manually. version. Automate any workflow Packages. 0, depending on the kind of pattern, and on some luck regarding the JIT compiler heuristics [0], matching can be up to three times faster than the original. If you will be creating many callbacks from the same function, you can use string. getregistry()", which you may not change in most case, it will finally dump the entrie lua state memory snapshot. 2, has some way of changing this, or turns the luaj RPFeltz's answer (load(string. ; rapidjson. This is a special kind of cdata returned by ffi. (Lua function that can be passed to it, that is) Why did this suddently change? I assume it’s broken and nobody knows it 🙁 The string files are significantly faster to load and process than the bytecode files. c LuaJIT core and libraries amalgamation LuaJIT has only a single stand-alone executable, called luajit on POSIX systems or luajit. find or string. On the other hand, for the normal mode, running the tests in multiple jobs actually would make the total running time longer. In the main thread-- allocate the buffer local Keys = ffi. find, . l — Dump module:line. dump, but I saw that the luaj 3. Well, almost. The compile status of string. dump(). Heres a small sample of comparisions. [1] Interning strings makes some string processing tasks more time- or space-efficient at the cost of requiring more Contribute to LuaJIT/LuaJIT development by creating an account on GitHub. Primitive types are transmitted 'as is' by copy: nil, boolean, number, string Functions are dumped The ffi. dump also has a chunk of the string returned with the full source of the code dumped by it. However, string. _VERSION. dump 对应的编译状态是 never，即不会被 JIT，会退回到解释器模式。 string. Basically, I need a way to get a binary string packed form of a list of numbers (floats for now), using Luajit, and be able to store it in a string & concat that string to another string and even write things after it (I got trouble with this one in 5. c I/O library lib os. Fetch the current backtrace from the current running Lua thread (when no L argument is given) or the Lua thread specified by the lua_State pointer. Some minor concessions are needed for smoother interoperation with Lua Note that the goal of LuaJIT is not only to produce fast code, but to have a fast and compact JIT compiler, too. (The problems with -jdump are that it is expensive to run the string formatting inside the system being Do you have any thoughts on how practical it would be to capture the dumps very efficiently in the running LuaJIT and then analyze/format Without questioin, gdb is a brilliant weapon to debug our program. . sizeof("EncryptionKeys"))) -- write to the buffer Keys[2]. It works perfectly on LuaJIT (but for some reason doesnot work on Lua 5. get_str() local c_str = ffi. dumpanalyze is a mini-framework equipped with a CLI for processing LuaJIT's plain text JIT compiler dumps. Any child Lua threads created will inherit the parent's exdata but still have their own exdata storage. 5. jit. LuaJIT does the same thing, except that it has a completely different VM & execution model. Note though that Lua is saving sizes of some native types in bytecode chunk header. h and #11 and added the missing opcode. dump with temporally switched-off luajit possible? From: Romulo <romuloab@> Date: Wed, 11 Nov 2009 15:37:16 -0200 > However, for a specific need I wrote in Lua a bytecode verifier to > characterize some subset of 'safe' bytecodes similar to what is > described in the Gems book. What can i get from the lua bytecode retrivied via string. dump with temporally switched-off luajit possible? From: "Dr. You can pass in LuaJIT source/bytecode instead of a function. [[1]] Related to that, this could be a good extension to also add in 5. Lua - make bytecode. Dumping Lua Scripts. 1 wouldn't be) I am imagining that a binary format based on LuaJIT's internal data structures would fit the bill. 20). Use systemtap to analyze the memory leak of lua code The memory used by lua code is managed by the GC, not calling malloc/free/mmap directly. Since a lot of the code is still in flux, it'll remain in alpha status for now. cast("uint64_t", Keys)) -- Send I want to pass Lua table storing strings to c function. -- -- TODO: Find See also string. dump(function() return "athin" end) The Constant Count shows 250 constants, but there should be only one. But, in online games, both clientside and serverside, it doesn’t properly. Saved searches Use saved searches to filter your results more quickly {"payload":{"allShortcutsEnabled":false,"fileTree":{"src/jit":{"items":[{"name":". dump(myfunc, true):byte(1, -1)} > table. find: partial: Compiled for plain string searches (no patterns) with -Ojitstr (since 0. In Lua, to keep i If you manually manage memory, you don't have to keep the pointer in a place where LuaJIT's GC can find it, because the memory doesn't interact with the GC in any way (unless you use ffi. 1 reference manual carefully? GopherLua is a Lua5. I have a suspicion that this might me a LuaJIT bytecode as if you convert that string to ANSI you will notice ESC, L, J sequence which is a function header for LuaJIT. As we know, LuaJIT in OpenResty is based on LuaJIT 2. exe on Windows. In LuaJIT, the second parameter [to string. string insert/remove, since UTF-8 substring extraction may be expensive. string function apparently does the conversion you are looking for. This means that if end-users call string. 1/5. For such CPUs, and when this branch is compiled with -msse4. Note that the goal of LuaJIT is not only to produce fast code, but to have a fast and compact JIT compiler, too. py. Contains the version number of the LuaJIT core. 1~ppa1 Replaces: libluajit2-5. decode()` decode json to lua table. dump on either of these functions, the resultant bytecode is not portable Hi @John @sim @jfperusse, I’ve been attempting to use Lua’s string. We need black magics to handle these cases. function: 0x7432287880 Please guide me what changes I need to make in the code so that I can get my original text back. 3. You should be familiar with Lua programming language. new is a function typed module implemented specifically by LuaJIT. dump(somefunctions) bytecode and compare it with the standard luajit 2. String Buffers; jit. Vanilla is about 200K, LuaJIT takes about twice as much. In lua 5. To get a grasp of what a Saved searches Use saved searches to filter your results more quickly Note that - contrary to PUC Lua - string. --Only dump memory snapshot Package luajit provides an interface to LuaJIT, a just-in-time compiler and interpreter for the Lua programming language. dump unavailability, and can live with it for general code. dump. Which seems counter to what I would expect. You can start your progam with long_var_name=nil; > byte_code_tab = {string. 0~beta3+git20220320+dfsg-4. dump: never 2. dumpanalyze can be used with any other software as well, as long the dump format remains the same. I’d recommend to start with LuaJIT right off the bat, especially if you have plans for accessing C world from Lua. As the signature is one byte too long, the normal decompilers don't work. 3, so not sure if it's possible in whatever solution you suggest to me below) If the requirement is "quick and dirty" I've found this one useful. Go luajit go! Peter Cawley 2010-03-02 13:47:51 UTC. dump change argument 2 into accepting either a boolean flag (true = strip, false = no strip) or a mode string (with 's' = strip, 'W' = non-GC64, 'X' = GC64). sort_keys option to rapidjson. dump(f [,strip]) generates portable bytecode. Contribute to kangchh/luajit development by creating an account on GitHub. Lua Bitop — a Lua extension for bitwise operations on numbers. _NAME ("rapidjson") and rapidjson. match and . yy. py Easier to read LuaJIT dumps. The OT stated that he needs output of var_dump. encode() and rapidjson. This optimization still provides constant-time hashing complexity (O(n)), but makes hash collision └─ dpkg -s libluajit-5. Any Lua flavour will do for now, you can pick from eLua for embedded, vanilla interpreter Lua or LuaJIT. cdecl — An abstract C type declaration (a Lua string). Saved searches Use saved searches to filter your results more quickly This page describes the API functions provided by the FFI library in detail. syntax: lbt [L] syntax: lbt full [L] file luajit21. 2, the string hashing function used for strings interning will be based on an optimized crc32 implementation For example, luajit -bl a. It also adds some useful routines against UTF-8 features, such as: a convenient interface to escape Unicode sequences in strings. Compiled in LuaJIT 2. dump and binds env to it, but is there a better more elegant way ? Alternatively, can a function somehow have different upvalues depending on some condition ? function f print "hello, world" end s = string. 1 is currently underway. dump it invariably returns one of two errors: "cannot load incompatible bytecode" or "cannot load malformed bytecode&q Skip to content lib string. lua"))))) assert(f:close()) If the code to be compiled is in a string, use load(s). It works by generating LuaJIT bytecode, including debug information, and uses LuaJIT's virtual machine to run the generated bytecode. load (string) Parse a string containing xml content and return a table. It sounds like an easy problem, but there is a huge list of libraries. OpenResty's Branch of LuaJIT 2. dump: never string. dump; setfenv for userdata, used by lpeg and maybe others (cant use lpeg without rewriting things) usage of __gc in libs has to be rewritten to lua_newuserdatactor or care has to be taken to close files/sockets etc; In my shim project I have added: dofile; load; loadstring; require; module; debug. 用于美化输出`Lua Table`. 1 implementation. – Etan Reisner Commented May 19, 2015 at 14:56 It is compatible with Lua's own string module and passes all string and pattern matching tests in the Lua test suite2. As the wiki said: In computer science, string interning is a method of storing only one copy of each distinct string value, which must be immutable. It has an interactive mode, too. NYI functions cause the JIT to bail out and fallback to the UPDATE 2: Pass the address of buffer instead of the content of buffer. do you plan at some point to document the bytecode format you're using? I'm binding a third-party C API that uses string statuses a lot. e. 0 bytecode instructions. strung. 0/2. E. zz is represented by the decimal number xxyyzz. 1 partial: Only plain string searches (no patterns). f=assert(io. - edubart/lua-dumper Bytecode as generated by LuaJIT string. It can be used to run simple Lua statements or whole Lua applications from the command line. ; ctype — A C type object. find: 2. Parser. dump(f))) is a clever one and may work for you, but it doesn't deal with functions that have upvalues (other than _ENV). 2, the string hashing function used for strings interning will be based on an optimized crc32 implementation (see lj_str_new()). dump() for information on bytecode portability and compatibility. The typedef for luaL_loadbuffer is syntax: lbt [L] syntax: lbt full [L] file luajit21. cdef [[ struct Reply { char * str; size_t len }; Reply * doSomething(); void freeReply(Reply * p); ]] Most often str would be an "OK" string. There is no difference. See above for a description of fmt and depth. p = luaJIT_profile_dumpstack(L, fmt, depth, len) — Dump stack . dump()? 1 what version is LuaR. C. A file in raw bytecode format is auto-detected and can be loaded like any Lua source file. In my use case, I need gzip compression, as it is expected by the receiver. If there was 1 byte more between the constant count and the instruction list, it would work perfectly: Luajit: compiling bytecode into object format. ; Added option. dump (table, max_depth) Dump a lua table in the format described above and return an XML When executing a script, Lua first compiles it to bytecode, then executes said bytecode in the VM. Comment on using this: If you use this with large SWIG modules, it is PAINFULLY slow -- more than 1/2 second to load this module due to the huge number of c function calls. Find and fix vulnerabilities Codespaces. Because of the recursion it can print nested tables too. 1 stitch: string. alioth. dump is never, i. . Uses xml. 1 Introduction to LuaJIT [1/2] Now that we have our own Linux system to work on, we can start writing programs for the Pi. 1-2 Package: libluajit-5. The basic loop would be: for i = 1, #str do local c = str:sub(i,i) -- do something with c end. See also string. The luajit GC uses mark-and-sweep algorithm. It's recommended to read through the introduction and the FFI tutorial first. getfenv; debug. I’m not entirely sure if there are other ways to load Lua scripts, but in every program I’ve seen, Lua scripts are loaded through luaL_loadbuffer. All of them compile quickly to a small (static or shared) library. What is this most likely if not Lua bytecode? 0 Quick&dirty verbose LuaJIT's bytecode version 1 disassembler - disassemble-luajit-v1. gmatch are consistently faster in my micro benchmarks (except find()ing plain strings, see below). If set to true, 'stripped' bytecode without debug information is generated. 1 language. format: partial: Compiled for non-%p and non-string arguments for %s. However, for a specific need I wrote in Lua a bytecode verifier to characterize some This code is converting the original text to a string dump perfectly. Introduction to LuaJIT [1/2] Now that we have our own Linux system to work on, we can start writing programs for the Pi. c String library lib table. It's basically a snapshot of the Lua state at that time to ensure the function will work again when re-executed as a normal function. 1-2 Status: install ok installed Priority: optional Section: interpreters Installed-Size: 592 Maintainer: Debian Lua Team <pkg-lua-devel@lists. When CompileString is passed LuaJIT bytecode produced by string. dump(testFn) local fn, err = load Bytecode as generated by LuaJIT string. cdata — A C data object. Markus Walther" <walther@> Date: Wed, 11 Nov 2009 18:29:11 +0100; Hi, I followed the discussion on string. dump to retrieve the bytecode. With LuaJIT 2. char is 2. You can dump Lua scripts by hooking luaL_loadbuffer and writing scripts to a file. 0: string. dump function but when I then attempt to load the generated binary string it fails with even the simplest of functions (same with an empty function): function setup() local testFn = function() return "Hello Lua!" end local dumped = string. Apart from the issues with LuaJIT it may not be portable across Lua releases or different operating system platforms. c Table library lib io. 2/5. LuaJIT is part of a hundred million web sites, huge SaaS installations, network switches, set-top boxes and other embedded devices. 1, you can iterate of the characters of a string this in a couple of ways. gsub takes about twice as much time. debian. open("luac. local function gen_header(defs32, defs64) local t 文章浏览阅读678次，点赞3次，收藏4次。因此即使我们的指令顺序被打乱，通过loadfile系统调用，再通过string. There is no real difference in information that is provided by json_encode and print_r - only the data format is different. zz is frozen at 99. For example, on my Macbook Pro, -j 8 makes the valgrind test mode more than 3x faster than -j 1 (which is the default). I am interested in influencing the way LuaJIT chooses to structure the traces for my code. Why string interning? String Interning is a common optimization in most of programming languages. On its own, the language toolkit does not do anything useful, since LuaJIT itself does the same things natively. Note: some files have more complex functions in them than others (hence the time differences). 1 VM developed by a single person, Mike Pall, who - based on his work - seems to be nothing short Mirror of the LuaJIT git repository. strip into a mode string for string. -j off — Turns the JIT engine [=file] — Dump bytecode + hints before compilation. 04. channel, effil. 1 partial: Not The string buffer library allows high-performance manipulation of string-like data. dump is not recommended. (In that case, Getinfo pops the function in the top of the stack. c OS library lib package. c rewrites this to BC_ISNUM num. stssifwvz pou vmgc mdjoej wdljn nzwofhy aqgtiz vix jgfbym asexca