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String buffers, part 1: object serialization.

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Mike Pall 2021-03-25 02:21:31 +01:00
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<a href="ext_ffi_semantics.html">FFI Semantics</a> <a href="ext_ffi_semantics.html">FFI Semantics</a>
</li></ul> </li></ul>
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<!DOCTYPE html>
<html>
<head>
<title>String Buffers</title>
<meta charset="utf-8">
<meta name="Copyright" content="Copyright (C) 2005-2021">
<meta name="Language" content="en">
<link rel="stylesheet" type="text/css" href="bluequad.css" media="screen">
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</head>
<body>
<div id="site">
<a href="https://luajit.org"><span>Lua<span id="logo">JIT</span></span></a>
</div>
<div id="head">
<h1>String Buffers</h1>
</div>
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<div id="main">
<p>
The string buffer library allows <b>high-performance manipulation of
string-like data</b>.
</p>
<p>
Unlike Lua strings, which are constants, string buffers are
<b>mutable</b> sequences of 8-bit (binary-transparent) characters. Data
can be stored, formatted and encoded into a string buffer and later
converted, decoded or extracted.
</p>
<p>
The convenient string buffer API simplifies common string manipulation
tasks, that would otherwise require creating many intermediate strings.
String buffers improve performance by eliminating redundant memory
copies, object creation, string interning and garbage collection
overhead. In conjunction with the FFI library, they allow zero-copy
operations.
</p>
<h2 id="load">Using the String Buffer Library</h2>
<p>
The string buffer library is built into LuaJIT by default, but it's not
loaded by default. Add this to the start of every Lua file that needs
one of its functions:
</p>
<pre class="code">
local buffer = require("string.buffer")
</pre>
<h2 id="wip" style="color:#ff0000">Work in Progress</h2>
<p>
<b style="color:#ff0000">This library is a work in progress. More
functions will be added soon.</b>
</p>
<h2 id="serialize">Serialization of Lua Objects</h2>
<p>
The following functions and methods allow <b>high-speed serialization</b>
(encoding) of a Lua object into a string and decoding it back to a Lua
object. This allows convenient storage and transport of <b>structured
data</b>.
</p>
<p>
The encoded data is in an <a href="#serialize_format">internal binary
format</a>. The data can be stored in files, binary-transparent
databases or transmitted to other LuaJIT instances across threads,
processes or networks.
</p>
<p>
Encoding speed can reach up to 1 Gigabyte/second on a modern desktop- or
server-class system, even when serializing many small objects. Decoding
speed is mostly constrained by object creation cost.
</p>
<p>
The serializer handles most Lua types, common FFI number types and
nested structures. Functions, thread objects, other FFI cdata, full
userdata and associated metatables cannot be serialized (yet).
</p>
<p>
The encoder serializes nested structures as trees. Multiple references
to a single object will be stored separately and create distinct objects
after decoding. Circular references cause an error.
</p>
<h3 id="buffer_encode"><tt>str = buffer.encode(obj)</tt></h3>
<p>
Serializes (encodes) the Lua object <tt>obj</tt> into the string
<tt>str</tt>.
</p>
<p>
<tt>obj</tt> can be any of the supported Lua types &mdash; it doesn't
need to be a Lua table.
</p>
<p>
This function may throw an error when attempting to serialize
unsupported object types, circular references or deeply nested tables.
</p>
<h3 id="buffer_decode"><tt>obj = buffer.decode(str)</tt></h3>
<p>
De-serializes (decodes) the string <tt>str</tt> into the Lua object
<tt>obj</tt>.
</p>
<p>
The returned object may be any of the supported Lua types &mdash;
even <tt>nil</tt>.
</p>
<p>
This function may throw an error when fed with malformed or incomplete
encoded data. The standalone function throws when there's left-over data
after decoding a single top-level object.
</p>
<h2 id="serialize_format">Serialization Format Specification</h2>
<p>
This serialization format is designed for <b>internal use</b> by LuaJIT
applications. Serialized data is upwards-compatible and portable across
all supported LuaJIT platforms.
</p>
<p>
It's an <b>8-bit binary format</b> and not human-readable. It uses e.g.
embedded zeroes and stores embedded Lua string objects unmodified, which
are 8-bit-clean, too. Encoded data can be safely concatenated for
streaming and later decoded one top-level object at a time.
</p>
<p>
The encoding is reasonably compact, but tuned for maximum performance,
not for minimum space usage. It compresses well with any of the common
byte-oriented data compression algorithms.
</p>
<p>
Although documented here for reference, this format is explicitly
<b>not</b> intended to be a 'public standard' for structured data
interchange across computer languages (like JSON or MessagePack). Please
do not use it as such.
</p>
<p>
The specification is given below as a context-free grammar with a
top-level <tt>object</tt> as the starting point. Alternatives are
separated by the <tt>|</tt> symbol and <tt>*</tt> indicates repeats.
Grouping is implicit or indicated by <tt>{…}</tt>. Terminals are
either plain hex numbers, encoded as bytes, or have a <tt>.format</tt>
suffix.
</p>
<pre>
object → nil | false | true
| null | lightud32 | lightud64
| int | num | tab
| int64 | uint64 | complex
| string
nil → 0x00
false → 0x01
true → 0x02
null → 0x03 // NULL lightuserdata
lightud32 → 0x04 data.I // 32 bit lightuserdata
lightud64 → 0x05 data.L // 64 bit lightuserdata
int → 0x06 int.I // int32_t
num → 0x07 double.L
tab → 0x08 // Empty table
| 0x09 h.U h*{object object} // Key/value hash
| 0x0a a.U a*object // 0-based array
| 0x0b a.U a*object h.U h*{object object} // Mixed
| 0x0c a.U (a-1)*object // 1-based array
| 0x0d a.U (a-1)*object h.U h*{object object} // Mixed
int64 → 0x10 int.L // FFI int64_t
uint64 → 0x11 uint.L // FFI uint64_t
complex → 0x12 re.L im.L // FFI complex
string → (0x20+len).U len*char.B
.B = 8 bit
.I = 32 bit little-endian
.L = 64 bit little-endian
.U = prefix-encoded 32 bit unsigned number n:
0x00..0xdf → n.B
0xe0..0x1fdf → (0xe0|(((n-0xe0)>>8)&0x1f)).B ((n-0xe0)&0xff).B
0x1fe0.. → 0xff n.I
</pre>
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<span class="noprint">
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<a href="ext_ffi_semantics.html">FFI Semantics</a> <a href="ext_ffi_semantics.html">FFI Semantics</a>
</li></ul> </li></ul>
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</li></ul> </li></ul>
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@ -42,6 +42,8 @@ td.abiparam { font-weight: bold; width: 6em; }
<a href="ext_ffi_semantics.html">FFI Semantics</a> <a href="ext_ffi_semantics.html">FFI Semantics</a>
</li></ul> </li></ul>
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<a class="current" href="ext_ffi_semantics.html">FFI Semantics</a> <a class="current" href="ext_ffi_semantics.html">FFI Semantics</a>
</li></ul> </li></ul>
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@ -44,6 +44,8 @@ td.idiomlua b { font-weight: normal; color: #2142bf; }
<a href="ext_ffi_semantics.html">FFI Semantics</a> <a href="ext_ffi_semantics.html">FFI Semantics</a>
</li></ul> </li></ul>
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<a href="ext_ffi_semantics.html">FFI Semantics</a> <a href="ext_ffi_semantics.html">FFI Semantics</a>
</li></ul> </li></ul>
</li><li> </li><li>
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</li><li>
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<a href="ext_ffi_semantics.html">FFI Semantics</a> <a href="ext_ffi_semantics.html">FFI Semantics</a>
</li></ul> </li></ul>
</li><li> </li><li>
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@ -54,6 +54,8 @@ td.excinterop {
<a href="ext_ffi_semantics.html">FFI Semantics</a> <a href="ext_ffi_semantics.html">FFI Semantics</a>
</li></ul> </li></ul>
</li><li> </li><li>
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</li><li> </li><li>
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@ -40,6 +40,8 @@ dd { margin-left: 1.5em; }
<a href="ext_ffi_semantics.html">FFI Semantics</a> <a href="ext_ffi_semantics.html">FFI Semantics</a>
</li></ul> </li></ul>
</li><li> </li><li>
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</li><li>
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@ -65,6 +65,8 @@ td.compatno {
<a href="ext_ffi_semantics.html">FFI Semantics</a> <a href="ext_ffi_semantics.html">FFI Semantics</a>
</li></ul> </li></ul>
</li><li> </li><li>
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@ -122,6 +122,8 @@ table.feature small {
<a href="ext_ffi_semantics.html">FFI Semantics</a> <a href="ext_ffi_semantics.html">FFI Semantics</a>
</li></ul> </li></ul>
</li><li> </li><li>
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</li><li> </li><li>
<a href="ext_c_api.html">Lua/C API</a> <a href="ext_c_api.html">Lua/C API</a>

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@ -59,6 +59,8 @@ td.param_default {
<a href="ext_ffi_semantics.html">FFI Semantics</a> <a href="ext_ffi_semantics.html">FFI Semantics</a>
</li></ul> </li></ul>
</li><li> </li><li>
<a href="ext_buffer.html">String Buffers</a>
</li><li>
<a href="ext_jit.html">jit.* Library</a> <a href="ext_jit.html">jit.* Library</a>
</li><li> </li><li>
<a href="ext_c_api.html">Lua/C API</a> <a href="ext_c_api.html">Lua/C API</a>

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@ -40,6 +40,8 @@ ul li { padding-bottom: 0.3em; }
<a href="ext_ffi_semantics.html">FFI Semantics</a> <a href="ext_ffi_semantics.html">FFI Semantics</a>
</li></ul> </li></ul>
</li><li> </li><li>
<a href="ext_buffer.html">String Buffers</a>
</li><li>
<a href="ext_jit.html">jit.* Library</a> <a href="ext_jit.html">jit.* Library</a>
</li><li> </li><li>
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src/Makefile
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@ -482,13 +482,15 @@ LJVM_BOUT= $(LJVM_S)
LJVM_MODE= elfasm LJVM_MODE= elfasm
LJLIB_O= lib_base.o lib_math.o lib_bit.o lib_string.o lib_table.o \ LJLIB_O= lib_base.o lib_math.o lib_bit.o lib_string.o lib_table.o \
lib_io.o lib_os.o lib_package.o lib_debug.o lib_jit.o lib_ffi.o lib_io.o lib_os.o lib_package.o lib_debug.o lib_jit.o lib_ffi.o \
lib_buffer.o
LJLIB_C= $(LJLIB_O:.o=.c) LJLIB_C= $(LJLIB_O:.o=.c)
LJCORE_O= lj_assert.o lj_gc.o lj_err.o lj_char.o lj_bc.o lj_obj.o lj_buf.o \ LJCORE_O= lj_assert.o lj_gc.o lj_err.o lj_char.o lj_bc.o lj_obj.o lj_buf.o \
lj_str.o lj_tab.o lj_func.o lj_udata.o lj_meta.o lj_debug.o \ lj_str.o lj_tab.o lj_func.o lj_udata.o lj_meta.o lj_debug.o \
lj_prng.o lj_state.o lj_dispatch.o lj_vmevent.o lj_vmmath.o \ lj_prng.o lj_state.o lj_dispatch.o lj_vmevent.o lj_vmmath.o \
lj_strscan.o lj_strfmt.o lj_strfmt_num.o lj_api.o lj_profile.o \ lj_strscan.o lj_strfmt.o lj_strfmt_num.o lj_serialize.o \
lj_api.o lj_profile.o \
lj_lex.o lj_parse.o lj_bcread.o lj_bcwrite.o lj_load.o \ lj_lex.o lj_parse.o lj_bcread.o lj_bcwrite.o lj_load.o \
lj_ir.o lj_opt_mem.o lj_opt_fold.o lj_opt_narrow.o \ lj_ir.o lj_opt_mem.o lj_opt_fold.o lj_opt_narrow.o \
lj_opt_dce.o lj_opt_loop.o lj_opt_split.o lj_opt_sink.o \ lj_opt_dce.o lj_opt_loop.o lj_opt_split.o lj_opt_sink.o \

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src/Makefile.dep
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@ -10,6 +10,9 @@ lib_bit.o: lib_bit.c lua.h luaconf.h lauxlib.h lualib.h lj_obj.h lj_def.h \
lj_arch.h lj_err.h lj_errmsg.h lj_buf.h lj_gc.h lj_str.h lj_strscan.h \ lj_arch.h lj_err.h lj_errmsg.h lj_buf.h lj_gc.h lj_str.h lj_strscan.h \
lj_strfmt.h lj_ctype.h lj_cdata.h lj_cconv.h lj_carith.h lj_ff.h \ lj_strfmt.h lj_ctype.h lj_cdata.h lj_cconv.h lj_carith.h lj_ff.h \
lj_ffdef.h lj_lib.h lj_libdef.h lj_ffdef.h lj_lib.h lj_libdef.h
lib_buffer.o: lib_buffer.c lua.h luaconf.h lauxlib.h lualib.h lj_obj.h \
lj_def.h lj_arch.h lj_gc.h lj_buf.h lj_str.h lj_serialize.h lj_lib.h \
lj_libdef.h
lib_debug.o: lib_debug.c lua.h luaconf.h lauxlib.h lualib.h lj_obj.h \ lib_debug.o: lib_debug.c lua.h luaconf.h lauxlib.h lualib.h lj_obj.h \
lj_def.h lj_arch.h lj_gc.h lj_err.h lj_errmsg.h lj_debug.h lj_lib.h \ lj_def.h lj_arch.h lj_gc.h lj_err.h lj_errmsg.h lj_debug.h lj_lib.h \
lj_libdef.h lj_libdef.h
@ -170,15 +173,18 @@ lj_parse.o: lj_parse.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \
lj_gc.h lj_err.h lj_errmsg.h lj_debug.h lj_buf.h lj_str.h lj_tab.h \ lj_gc.h lj_err.h lj_errmsg.h lj_debug.h lj_buf.h lj_str.h lj_tab.h \
lj_func.h lj_state.h lj_bc.h lj_ctype.h lj_strfmt.h lj_lex.h lj_parse.h \ lj_func.h lj_state.h lj_bc.h lj_ctype.h lj_strfmt.h lj_lex.h lj_parse.h \
lj_vm.h lj_vmevent.h lj_vm.h lj_vmevent.h
lj_prng.o: lj_prng.c lj_def.h lua.h luaconf.h lj_arch.h lj_prng.h
lj_profile.o: lj_profile.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \ lj_profile.o: lj_profile.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \
lj_buf.h lj_gc.h lj_str.h lj_frame.h lj_bc.h lj_debug.h lj_dispatch.h \ lj_buf.h lj_gc.h lj_str.h lj_frame.h lj_bc.h lj_debug.h lj_dispatch.h \
lj_jit.h lj_ir.h lj_trace.h lj_traceerr.h lj_profile.h luajit.h lj_jit.h lj_ir.h lj_trace.h lj_traceerr.h lj_profile.h luajit.h
lj_prng.o: lj_prng.c lj_def.h lua.h luaconf.h lj_arch.h lj_prng.h
lj_record.o: lj_record.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \ lj_record.o: lj_record.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \
lj_err.h lj_errmsg.h lj_str.h lj_tab.h lj_meta.h lj_frame.h lj_bc.h \ lj_err.h lj_errmsg.h lj_str.h lj_tab.h lj_meta.h lj_frame.h lj_bc.h \
lj_ctype.h lj_gc.h lj_ff.h lj_ffdef.h lj_debug.h lj_ir.h lj_jit.h \ lj_ctype.h lj_gc.h lj_ff.h lj_ffdef.h lj_debug.h lj_ir.h lj_jit.h \
lj_ircall.h lj_iropt.h lj_trace.h lj_dispatch.h lj_traceerr.h \ lj_ircall.h lj_iropt.h lj_trace.h lj_dispatch.h lj_traceerr.h \
lj_record.h lj_ffrecord.h lj_snap.h lj_vm.h lj_prng.h lj_record.h lj_ffrecord.h lj_snap.h lj_vm.h lj_prng.h
lj_serialize.o: lj_serialize.c lj_obj.h lua.h luaconf.h lj_def.h \
lj_arch.h lj_err.h lj_errmsg.h lj_buf.h lj_gc.h lj_str.h lj_tab.h \
lj_udata.h lj_ctype.h lj_cdata.h lj_serialize.h
lj_snap.o: lj_snap.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h lj_gc.h \ lj_snap.o: lj_snap.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h lj_gc.h \
lj_tab.h lj_state.h lj_frame.h lj_bc.h lj_ir.h lj_jit.h lj_iropt.h \ lj_tab.h lj_state.h lj_frame.h lj_bc.h lj_ir.h lj_jit.h lj_iropt.h \
lj_trace.h lj_dispatch.h lj_traceerr.h lj_snap.h lj_target.h \ lj_trace.h lj_dispatch.h lj_traceerr.h lj_snap.h lj_target.h \
@ -189,7 +195,7 @@ lj_state.o: lj_state.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \
lj_ir.h lj_dispatch.h lj_traceerr.h lj_vm.h lj_prng.h lj_lex.h \ lj_ir.h lj_dispatch.h lj_traceerr.h lj_vm.h lj_prng.h lj_lex.h \
lj_alloc.h luajit.h lj_alloc.h luajit.h
lj_str.o: lj_str.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h lj_gc.h \ lj_str.o: lj_str.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h lj_gc.h \
lj_err.h lj_errmsg.h lj_str.h lj_char.h lj_err.h lj_errmsg.h lj_str.h lj_char.h lj_prng.h
lj_strfmt.o: lj_strfmt.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \ lj_strfmt.o: lj_strfmt.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \
lj_buf.h lj_gc.h lj_str.h lj_state.h lj_char.h lj_strfmt.h lj_buf.h lj_gc.h lj_str.h lj_state.h lj_char.h lj_strfmt.h
lj_strfmt_num.o: lj_strfmt_num.c lj_obj.h lua.h luaconf.h lj_def.h \ lj_strfmt_num.o: lj_strfmt_num.c lj_obj.h lua.h luaconf.h lj_def.h \
@ -204,7 +210,7 @@ lj_trace.o: lj_trace.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \
lj_dispatch.h lj_traceerr.h lj_snap.h lj_gdbjit.h lj_record.h lj_asm.h \ lj_dispatch.h lj_traceerr.h lj_snap.h lj_gdbjit.h lj_record.h lj_asm.h \
lj_vm.h lj_vmevent.h lj_target.h lj_target_*.h lj_prng.h lj_vm.h lj_vmevent.h lj_target.h lj_target_*.h lj_prng.h
lj_udata.o: lj_udata.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \ lj_udata.o: lj_udata.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \
lj_gc.h lj_udata.h lj_gc.h lj_err.h lj_errmsg.h lj_udata.h
lj_vmevent.o: lj_vmevent.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \ lj_vmevent.o: lj_vmevent.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \
lj_str.h lj_tab.h lj_state.h lj_dispatch.h lj_bc.h lj_jit.h lj_ir.h \ lj_str.h lj_tab.h lj_state.h lj_dispatch.h lj_bc.h lj_jit.h lj_ir.h \
lj_vm.h lj_vmevent.h lj_vm.h lj_vmevent.h
@ -216,23 +222,23 @@ ljamalg.o: ljamalg.c lua.h luaconf.h lauxlib.h lj_assert.c lj_obj.h \
lj_bc.h lj_ctype.h lj_cdata.h lj_trace.h lj_jit.h lj_ir.h lj_dispatch.h \ lj_bc.h lj_ctype.h lj_cdata.h lj_trace.h lj_jit.h lj_ir.h lj_dispatch.h \
lj_traceerr.h lj_vm.h lj_err.c lj_debug.h lj_ff.h lj_ffdef.h lj_strfmt.h \ lj_traceerr.h lj_vm.h lj_err.c lj_debug.h lj_ff.h lj_ffdef.h lj_strfmt.h \
lj_char.c lj_char.h lj_bc.c lj_bcdef.h lj_obj.c lj_buf.c lj_str.c \ lj_char.c lj_char.h lj_bc.c lj_bcdef.h lj_obj.c lj_buf.c lj_str.c \
lj_tab.c lj_func.c lj_udata.c lj_meta.c lj_strscan.h lj_lib.h lj_debug.c \ lj_prng.h lj_tab.c lj_func.c lj_udata.c lj_meta.c lj_strscan.h lj_lib.h \
lj_prng.c lj_prng.h lj_state.c lj_lex.h lj_alloc.h luajit.h \ lj_debug.c lj_prng.c lj_state.c lj_lex.h lj_alloc.h luajit.h \
lj_dispatch.c lj_ccallback.h lj_profile.h lj_vmevent.c lj_vmevent.h \ lj_dispatch.c lj_ccallback.h lj_profile.h lj_vmevent.c lj_vmevent.h \
lj_vmmath.c lj_strscan.c lj_strfmt.c lj_strfmt_num.c lj_api.c \ lj_vmmath.c lj_strscan.c lj_strfmt.c lj_strfmt_num.c lj_serialize.c \
lj_profile.c lj_lex.c lualib.h lj_parse.h lj_parse.c lj_bcread.c \ lj_serialize.h lj_api.c lj_profile.c lj_lex.c lualib.h lj_parse.h \
lj_bcdump.h lj_bcwrite.c lj_load.c lj_ctype.c lj_cdata.c lj_cconv.h \ lj_parse.c lj_bcread.c lj_bcdump.h lj_bcwrite.c lj_load.c lj_ctype.c \
lj_cconv.c lj_ccall.c lj_ccall.h lj_ccallback.c lj_target.h \ lj_cdata.c lj_cconv.h lj_cconv.c lj_ccall.c lj_ccall.h lj_ccallback.c \
lj_target_*.h lj_mcode.h lj_carith.c lj_carith.h lj_clib.c lj_clib.h \ lj_target.h lj_target_*.h lj_mcode.h lj_carith.c lj_carith.h lj_clib.c \
lj_cparse.c lj_cparse.h lj_lib.c lj_ir.c lj_ircall.h lj_iropt.h \ lj_clib.h lj_cparse.c lj_cparse.h lj_lib.c lj_ir.c lj_ircall.h \
lj_opt_mem.c lj_opt_fold.c lj_folddef.h lj_opt_narrow.c lj_opt_dce.c \ lj_iropt.h lj_opt_mem.c lj_opt_fold.c lj_folddef.h lj_opt_narrow.c \
lj_opt_loop.c lj_snap.h lj_opt_split.c lj_opt_sink.c lj_mcode.c \ lj_opt_dce.c lj_opt_loop.c lj_snap.h lj_opt_split.c lj_opt_sink.c \
lj_snap.c lj_record.c lj_record.h lj_ffrecord.h lj_crecord.c \ lj_mcode.c lj_snap.c lj_record.c lj_record.h lj_ffrecord.h lj_crecord.c \
lj_crecord.h lj_ffrecord.c lj_recdef.h lj_asm.c lj_asm.h lj_emit_*.h \ lj_crecord.h lj_ffrecord.c lj_recdef.h lj_asm.c lj_asm.h lj_emit_*.h \
lj_asm_*.h lj_trace.c lj_gdbjit.h lj_gdbjit.c lj_alloc.c lib_aux.c \ lj_asm_*.h lj_trace.c lj_gdbjit.h lj_gdbjit.c lj_alloc.c lib_aux.c \
lib_base.c lj_libdef.h lib_math.c lib_string.c lib_table.c lib_io.c \ lib_base.c lj_libdef.h lib_math.c lib_string.c lib_table.c lib_io.c \
lib_os.c lib_package.c lib_debug.c lib_bit.c lib_jit.c lib_ffi.c \ lib_os.c lib_package.c lib_debug.c lib_bit.c lib_jit.c lib_ffi.c \
lib_init.c lib_buffer.c lib_init.c
luajit.o: luajit.c lua.h luaconf.h lauxlib.h lualib.h luajit.h lj_arch.h luajit.o: luajit.c lua.h luaconf.h lauxlib.h lualib.h luajit.h lj_arch.h
host/buildvm.o: host/buildvm.c host/buildvm.h lj_def.h lua.h luaconf.h \ host/buildvm.o: host/buildvm.c host/buildvm.h lj_def.h lua.h luaconf.h \
lj_arch.h lj_obj.h lj_def.h lj_arch.h lj_gc.h lj_obj.h lj_bc.h lj_ir.h \ lj_arch.h lj_obj.h lj_def.h lj_arch.h lj_gc.h lj_obj.h lj_bc.h lj_ir.h \

66
src/lib_buffer.c Normal file
View File

@ -0,0 +1,66 @@
/*
** Buffer library.
** Copyright (C) 2005-2021 Mike Pall. See Copyright Notice in luajit.h
*/
#define lib_buffer_c
#define LUA_LIB
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "lj_obj.h"
#if LJ_HASBUFFER
#include "lj_gc.h"
#include "lj_buf.h"
#include "lj_serialize.h"
#include "lj_lib.h"
/* ------------------------------------------------------------------------ */
#define LJLIB_MODULE_buffer
/* Note: this uses interim structs until the SBuf reorg. */
LJLIB_CF(buffer_encode)
{
cTValue *o = lj_lib_checkany(L, 1);
StrBuf sbuf;
sbuf.sb = lj_buf_tmp_(L);
lj_serialize_put(&sbuf, o);
setstrV(L, L->top++, lj_buf_str(L, sbuf.sb));
lj_gc_check(L);
return 1;
}
LJLIB_CF(buffer_decode)
{
GCstr *str = lj_lib_checkstr(L, 1);
const char *p = strdata(str);
SBuf sb;
StrBuf sbuf;
setsbufL(&sb, L);
setmref(sb.b, p);
setmref(sb.p, p + str->len);
setmref(sb.e, p + str->len);
sbuf.sb = &sb;
sbuf.r = (char *)p;
setnilV(L->top++);
lj_serialize_get(&sbuf, L->top-1);
lj_gc_check(L);
return 1;
}
/* ------------------------------------------------------------------------ */
#include "lj_libdef.h"
int luaopen_string_buffer(lua_State *L)
{
LJ_LIB_REG(L, NULL, buffer);
return 1;
}
#endif

3
src/lib_string.c
View File

@ -743,6 +743,9 @@ LUALIB_API int luaopen_string(lua_State *L)
setgcref(basemt_it(g, LJ_TSTR), obj2gco(mt)); setgcref(basemt_it(g, LJ_TSTR), obj2gco(mt));
settabV(L, lj_tab_setstr(L, mt, mmname_str(g, MM_index)), tabV(L->top-1)); settabV(L, lj_tab_setstr(L, mt, mmname_str(g, MM_index)), tabV(L->top-1));
mt->nomm = (uint8_t)(~(1u<<MM_index)); mt->nomm = (uint8_t)(~(1u<<MM_index));
#if LJ_HASBUFFER
lj_lib_prereg(L, LUA_STRLIBNAME ".buffer", luaopen_string_buffer, tabV(L->top-1));
#endif
return 1; return 1;
} }

7
src/lj_arch.h
View File

@ -549,6 +549,13 @@
#define LJ_HASFFI 1 #define LJ_HASFFI 1
#endif #endif
/* Disable or enable the string buffer extension. */
#if defined(LUAJIT_DISABLE_BUFFER)
#define LJ_HASBUFFER 0
#else
#define LJ_HASBUFFER 1
#endif
#if defined(LUAJIT_DISABLE_PROFILE) #if defined(LUAJIT_DISABLE_PROFILE)
#define LJ_HASPROFILE 0 #define LJ_HASPROFILE 0
#elif LJ_TARGET_POSIX #elif LJ_TARGET_POSIX

9
src/lj_buf.h
View File

@ -10,7 +10,7 @@
#include "lj_gc.h" #include "lj_gc.h"
#include "lj_str.h" #include "lj_str.h"
/* Resizable string buffers. Struct definition in lj_obj.h. */ /* Resizable string buffers. SBuf struct definition in lj_obj.h. */
#define sbufB(sb) (mref((sb)->b, char)) #define sbufB(sb) (mref((sb)->b, char))
#define sbufP(sb) (mref((sb)->p, char)) #define sbufP(sb) (mref((sb)->p, char))
#define sbufE(sb) (mref((sb)->e, char)) #define sbufE(sb) (mref((sb)->e, char))
@ -100,4 +100,11 @@ static LJ_AINLINE GCstr *lj_buf_str(lua_State *L, SBuf *sb)
return lj_str_new(L, sbufB(sb), sbuflen(sb)); return lj_str_new(L, sbufB(sb), sbuflen(sb));
} }
/* Interim user-accessible string buffer. */
typedef struct StrBuf {
SBuf *sb; /* Pointer to system buffer. */
char *r; /* String buffer read pointer. */
int depth; /* Remaining recursion depth. */
} StrBuf;
#endif #endif

10
src/lj_errmsg.h
View File

@ -179,6 +179,16 @@ ERRDEF(FFI_NYIPACKBIT, "NYI: packed bit fields")
ERRDEF(FFI_NYICALL, "NYI: cannot call this C function (yet)") ERRDEF(FFI_NYICALL, "NYI: cannot call this C function (yet)")
#endif #endif
#if LJ_HASBUFFER
/* String buffer errors. */
ERRDEF(BUFFER_BADENC, "cannot serialize " LUA_QS)
ERRDEF(BUFFER_BADDEC, "cannot deserialize tag 0x%02x")
ERRDEF(BUFFER_DEPTH, "too deep to serialize")
ERRDEF(BUFFER_DUPKEY, "duplicate table key")
ERRDEF(BUFFER_EOB, "unexpected end of buffer")
ERRDEF(BUFFER_LEFTOV, "left-over data in buffer")
#endif
#undef ERRDEF #undef ERRDEF
/* Detecting unused error messages: /* Detecting unused error messages:

351
src/lj_serialize.c Normal file
View File

@ -0,0 +1,351 @@
/*
** Object de/serialization.
** Copyright (C) 2005-2021 Mike Pall. See Copyright Notice in luajit.h
*/
#define lj_serialize_c
#define LUA_CORE
#include "lj_obj.h"
#include "lj_err.h"
#include "lj_buf.h"
#include "lj_str.h"
#include "lj_tab.h"
#include "lj_udata.h"
#if LJ_HASFFI
#include "lj_ctype.h"
#include "lj_cdata.h"
#endif
#include "lj_serialize.h"
/* Tags for internal serialization format. */
enum {
SER_TAG_NIL, /* 0x00 */
SER_TAG_FALSE,
SER_TAG_TRUE,
SER_TAG_NULL,
SER_TAG_LIGHTUD32,
SER_TAG_LIGHTUD64,
SER_TAG_INT,
SER_TAG_NUM,
SER_TAG_TAB, /* 0x08 */
SER_TAG_0x0e = SER_TAG_TAB+6,
SER_TAG_0x0f,
SER_TAG_INT64, /* 0x10 */
SER_TAG_UINT64,
SER_TAG_COMPLEX,
SER_TAG_0x13,
SER_TAG_0x14,
SER_TAG_0x15,
SER_TAG_0x16,
SER_TAG_0x17,
SER_TAG_0x18, /* 0x18 */
SER_TAG_0x19,
SER_TAG_0x1a,
SER_TAG_0x1b,
SER_TAG_0x1c,
SER_TAG_0x1d,
SER_TAG_0x1e,
SER_TAG_0x1f,
SER_TAG_STR, /* 0x20 + str->len */
};
LJ_STATIC_ASSERT((SER_TAG_TAB & 7) == 0);
/* -- Helper functions ---------------------------------------------------- */
static LJ_AINLINE char *serialize_more(char *w, StrBuf *sbuf, MSize sz)
{
if (LJ_UNLIKELY(sz > (MSize)(sbufE(sbuf->sb) - w))) {
setsbufP(sbuf->sb, w);
w = lj_buf_more2(sbuf->sb, sz);
}
return w;
}
/* Write U124 to buffer. */
static LJ_NOINLINE char *serialize_wu124_(char *w, uint32_t v)
{
if (v < 0x1fe0) {
v -= 0xe0;
*w++ = (char)(0xe0 | (v >> 8)); *w++ = (char)v;
} else {
*w++ = (char)0xff;
#if LJ_BE
v = lj_bswap(v);
#endif
memcpy(w, &v, 4); w += 4;
}
return w;
}
static LJ_AINLINE char *serialize_wu124(char *w, uint32_t v)
{
if (LJ_LIKELY(v < 0xe0)) {
*w++ = (char)v;
return w;
} else {
return serialize_wu124_(w, v);
}
}
static LJ_NOINLINE char *serialize_ru124_(char *r, char *e, uint32_t *pv)
{
uint32_t v = *pv;
if (v != 0xff) {
if (r >= e) return NULL;
v = ((v & 0x1f) << 8) + *(uint8_t *)r + 0xe0; r++;
} else {
if (r + 4 > e) return NULL;
v = lj_getu32(r); r += 4;
#if LJ_BE
v = lj_bswap(v);
#endif
}
*pv = v;
return r;
}
static LJ_AINLINE char *serialize_ru124(char *r, char *e, uint32_t *pv)
{
if (LJ_LIKELY(r < e)) {
uint32_t v = *(uint8_t *)r; r++;
*pv = v;
if (LJ_UNLIKELY(v >= 0xe0)) {
r = serialize_ru124_(r, e, pv);
}
return r;
}
return NULL;
}
/* -- Internal serializer ------------------------------------------------- */
/* Put serialized object into buffer. */
static char *serialize_put(char *w, StrBuf *sbuf, cTValue *o)
{
if (LJ_LIKELY(tvisstr(o))) {
const GCstr *str = strV(o);
MSize len = str->len;
w = serialize_more(w, sbuf, 5+len);
w = serialize_wu124(w, SER_TAG_STR + len);
w = lj_buf_wmem(w, strdata(str), len);
} else if (tvisint(o)) {
uint32_t x = LJ_BE ? lj_bswap((uint32_t)intV(o)) : (uint32_t)intV(o);
w = serialize_more(w, sbuf, 1+4);
*w++ = SER_TAG_INT; memcpy(w, &x, 4); w += 4;
} else if (tvisnum(o)) {
uint64_t x = LJ_BE ? lj_bswap64(o->u64) : o->u64;
w = serialize_more(w, sbuf, 1+sizeof(lua_Number));
*w++ = SER_TAG_NUM; memcpy(w, &x, 8); w += 8;
} else if (tvispri(o)) {
w = serialize_more(w, sbuf, 1);
*w++ = (char)(SER_TAG_NIL + ~itype(o));
} else if (tvistab(o)) {
const GCtab *t = tabV(o);
uint32_t narray = 0, nhash = 0, one = 2;
if (sbuf->depth <= 0) lj_err_caller(sbufL(sbuf->sb), LJ_ERR_BUFFER_DEPTH);
sbuf->depth--;
if (t->asize > 0) { /* Determine max. length of array part. */
ptrdiff_t i;
TValue *array = tvref(t->array);
for (i = (ptrdiff_t)t->asize-1; i >= 0; i--)
if (!tvisnil(&array[i]))
break;
narray = (uint32_t)(i+1);
if (narray && tvisnil(&array[0])) one = 4;
}
if (t->hmask > 0) { /* Count number of used hash slots. */
uint32_t i, hmask = t->hmask;
Node *node = noderef(t->node);
for (i = 0; i <= hmask; i++)
nhash += !tvisnil(&node[i].val);
}
/* Write number of array slots and hash slots. */
w = serialize_more(w, sbuf, 1+2*5);
*w++ = (char)(SER_TAG_TAB + (nhash ? 1 : 0) + (narray ? one : 0));
if (narray) w = serialize_wu124(w, narray);
if (nhash) w = serialize_wu124(w, nhash);
if (narray) { /* Write array entries. */
cTValue *oa = tvref(t->array) + (one >> 2);
cTValue *oe = tvref(t->array) + narray;
while (oa < oe) w = serialize_put(w, sbuf, oa++);
}
if (nhash) { /* Write hash entries. */
const Node *node = noderef(t->node) + t->hmask;
for (;; node--)
if (!tvisnil(&node->val)) {
w = serialize_put(w, sbuf, &node->key);
w = serialize_put(w, sbuf, &node->val);
if (--nhash == 0) break;
}
}
sbuf->depth++;
#if LJ_HASFFI
} else if (tviscdata(o)) {
CTState *cts = ctype_cts(sbufL(sbuf->sb));
CType *s = ctype_raw(cts, cdataV(o)->ctypeid);
uint8_t *sp = cdataptr(cdataV(o));
if (ctype_isinteger(s->info) && s->size == 8) {
w = serialize_more(w, sbuf, 1+8);
*w++ = (s->info & CTF_UNSIGNED) ? SER_TAG_UINT64 : SER_TAG_INT64;
#if LJ_BE
{ uint64_t u = lj_bswap64(*(uint64_t *)sp); memcpy(w, &u, 8); }
#else
memcpy(w, sp, 8);
#endif
w += 8;
} else if (ctype_iscomplex(s->info) && s->size == 16) {
w = serialize_more(w, sbuf, 1+16);
*w++ = SER_TAG_COMPLEX;
#if LJ_BE
{ /* Only swap the doubles. The re/im order stays the same. */
uint64_t u = lj_bswap64(((uint64_t *)sp)[0]); memcpy(w, &u, 8);
u = lj_bswap64(((uint64_t *)sp)[1]); memcpy(w+8, &u, 8);
}
#else
memcpy(w, sp, 16);
#endif
w += 16;
} else {
goto badenc; /* NYI other cdata */
}
#endif
} else if (tvislightud(o)) {
uintptr_t ud = (uintptr_t)lightudV(G(sbufL(sbuf->sb)), o);
w = serialize_more(w, sbuf, 1+sizeof(ud));
if (ud == 0) {
*w++ = SER_TAG_NULL;
} else if (LJ_32 || checku32(ud)) {
#if LJ_BE && LJ_64
ud = lj_bswap64(ud);
#elif LJ_BE
ud = lj_bswap(ud);
#endif
*w++ = SER_TAG_LIGHTUD32; memcpy(w, &ud, 4); w += 4;
} else {
#if LJ_BE
ud = lj_bswap64(ud);
#endif
*w++ = SER_TAG_LIGHTUD64; memcpy(w, &ud, 8); w += 8;
}
} else {
/* NYI userdata */
#if LJ_HASFFI
badenc:
#endif
lj_err_callerv(sbufL(sbuf->sb), LJ_ERR_BUFFER_BADENC, lj_typename(o));
}
return w;
}
/* Get serialized object from buffer. */
static char *serialize_get(char *r, StrBuf *sbuf, TValue *o)
{
char *e = sbufE(sbuf->sb);
uint32_t tp;
r = serialize_ru124(r, e, &tp); if (LJ_UNLIKELY(!r)) goto eob;
if (LJ_LIKELY(tp >= SER_TAG_STR)) {
uint32_t len = tp - SER_TAG_STR;
if (LJ_UNLIKELY(len > (uint32_t)(e - r))) goto eob;
setstrV(sbufL(sbuf->sb), o, lj_str_new(sbufL(sbuf->sb), r, len));
r += len;
} else if (tp == SER_TAG_INT) {
if (LJ_UNLIKELY(r + 4 > e)) goto eob;
setintV(o, (int32_t)(LJ_BE ? lj_bswap(lj_getu32(r)) : lj_getu32(r)));
r += 4;
} else if (tp == SER_TAG_NUM) {
if (LJ_UNLIKELY(r + 8 > e)) goto eob;
memcpy(o, r, 8); r += 8;
#if LJ_BE
o->u64 = lj_bswap64(o->u64);
#endif
if (!tvisnum(o)) setnanV(o);
} else if (tp <= SER_TAG_TRUE) {
setpriV(o, ~tp);
} else if (tp >= SER_TAG_TAB && tp < SER_TAG_TAB+6) {
uint32_t narray = 0, nhash = 0;
GCtab *t;
if (tp >= SER_TAG_TAB+2) {
r = serialize_ru124(r, e, &narray); if (LJ_UNLIKELY(!r)) goto eob;
}
if ((tp & 1)) {
r = serialize_ru124(r, e, &nhash); if (LJ_UNLIKELY(!r)) goto eob;
}
t = lj_tab_new(sbufL(sbuf->sb), narray, hsize2hbits(nhash));
settabV(sbufL(sbuf->sb), o, t);
if (narray) {
TValue *oa = tvref(t->array) + (tp >= SER_TAG_TAB+4);
TValue *oe = tvref(t->array) + narray;
while (oa < oe) r = serialize_get(r, sbuf, oa++);
}
if (nhash) {
do {
TValue k, *v;
r = serialize_get(r, sbuf, &k);
v = lj_tab_set(sbufL(sbuf->sb), t, &k);
if (LJ_UNLIKELY(!tvisnil(v)))
lj_err_caller(sbufL(sbuf->sb), LJ_ERR_BUFFER_DUPKEY);
r = serialize_get(r, sbuf, v);
} while (--nhash);
}
#if LJ_HASFFI
} else if (tp >= SER_TAG_INT64 && tp <= SER_TAG_COMPLEX) {
uint32_t sz = tp == SER_TAG_COMPLEX ? 16 : 8;
GCcdata *cd;
if (LJ_UNLIKELY(r + sz > e)) goto eob;
cd = lj_cdata_new_(sbufL(sbuf->sb),
tp == SER_TAG_INT64 ? CTID_INT64 :
tp == SER_TAG_UINT64 ? CTID_UINT64 : CTID_COMPLEX_DOUBLE,
sz);
memcpy(cdataptr(cd), r, sz); r += sz;
#if LJ_BE
*(uint64_t *)cdataptr(cd) = lj_bswap64(*(uint64_t *)cdataptr(cd));
if (sz == 16)
((uint64_t *)cdataptr(cd))[1] = lj_bswap64(((uint64_t *)cdataptr(cd))[1]);
#endif
setcdataV(sbufL(sbuf->sb), o, cd);
#endif
} else if (tp <= (LJ_64 ? SER_TAG_LIGHTUD64 : SER_TAG_LIGHTUD32)) {
uintptr_t ud = 0;
if (tp == SER_TAG_LIGHTUD32) {
if (LJ_UNLIKELY(r + 4 > e)) goto eob;
ud = (uintptr_t)(LJ_BE ? lj_bswap(lj_getu32(r)) : lj_getu32(r));
r += 4;
}
#if LJ_64
else if (tp == SER_TAG_LIGHTUD64) {
if (LJ_UNLIKELY(r + 8 > e)) goto eob;
memcpy(&ud, r, 8); r += 8;
#if LJ_BE
ud = lj_bswap64(ud);
#endif
}
setrawlightudV(o, lj_lightud_intern(sbufL(sbuf->sb), (void *)ud));
#else
setrawlightudV(o, (void *)ud);
#endif
} else {
lj_err_callerv(sbufL(sbuf->sb), LJ_ERR_BUFFER_BADDEC, tp);
}
return r;
eob:
lj_err_caller(sbufL(sbuf->sb), LJ_ERR_BUFFER_EOB);
return NULL;
}
StrBuf * LJ_FASTCALL lj_serialize_put(StrBuf *sbuf, cTValue *o)
{
sbuf->depth = LJ_SERIALIZE_DEPTH;
setsbufP(sbuf->sb, serialize_put(sbufP(sbuf->sb), sbuf, o));
return sbuf;
}
StrBuf * LJ_FASTCALL lj_serialize_get(StrBuf *sbuf, TValue *o)
{
char *r = serialize_get(sbuf->r, sbuf, o);
if (r != sbufP(sbuf->sb))
lj_err_caller(sbufL(sbuf->sb), LJ_ERR_BUFFER_LEFTOV);
sbuf->r = r;
return sbuf;
}

21
src/lj_serialize.h Normal file
View File

@ -0,0 +1,21 @@
/*
** Object de/serialization.
** Copyright (C) 2005-2021 Mike Pall. See Copyright Notice in luajit.h
*/
#ifndef _LJ_SERIALIZE_H
#define _LJ_SERIALIZE_H
#include "lj_obj.h"
#include "lj_buf.h"
#if LJ_HASBUFFER
#define LJ_SERIALIZE_DEPTH 100 /* Default depth. */
LJ_FUNC StrBuf * LJ_FASTCALL lj_serialize_put(StrBuf *sb, cTValue *o);
LJ_FUNC StrBuf * LJ_FASTCALL lj_serialize_get(StrBuf *sb, TValue *o);
#endif
#endif

2
src/ljamalg.c
View File

@ -39,6 +39,7 @@
#include "lj_strscan.c" #include "lj_strscan.c"
#include "lj_strfmt.c" #include "lj_strfmt.c"
#include "lj_strfmt_num.c" #include "lj_strfmt_num.c"
#include "lj_serialize.c"
#include "lj_api.c" #include "lj_api.c"
#include "lj_profile.c" #include "lj_profile.c"
#include "lj_lex.c" #include "lj_lex.c"
@ -85,5 +86,6 @@
#include "lib_bit.c" #include "lib_bit.c"
#include "lib_jit.c" #include "lib_jit.c"
#include "lib_ffi.c" #include "lib_ffi.c"
#include "lib_buffer.c"
#include "lib_init.c" #include "lib_init.c"

1
src/lualib.h
View File

@ -33,6 +33,7 @@ LUALIB_API int luaopen_debug(lua_State *L);
LUALIB_API int luaopen_bit(lua_State *L); LUALIB_API int luaopen_bit(lua_State *L);
LUALIB_API int luaopen_jit(lua_State *L); LUALIB_API int luaopen_jit(lua_State *L);
LUALIB_API int luaopen_ffi(lua_State *L); LUALIB_API int luaopen_ffi(lua_State *L);
LUALIB_API int luaopen_string_buffer(lua_State *L);
LUALIB_API void luaL_openlibs(lua_State *L); LUALIB_API void luaL_openlibs(lua_State *L);