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Revert commit ced808d5ab 

I think this experiment is unsuccessful and does not work well in a module mode
with dynamic symbols resolution and mixing between different mlua instances.
Overall the Rust bug has been fixed and we can wait for the "C-unwind" feature become stable.
This commit is contained in:
Alex Orlenko 2021-06-16 22:13:11 +01:00
parent fca21d56d3
commit d3f44354e0
16 changed files with 594 additions and 2420 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
build/main.rs
View File

@ -242,11 +242,6 @@ fn main() {
let mut shim_cc = cc::Build::new();
shim_cc
.include(include_dir)
.define("COMPAT53_INCLUDE_SOURCE", None);
#[cfg(feature = "luajit")]
shim_cc.define("COMPAT53_LUAJIT", None);
shim_cc
.file("src/ffi/shim/shim.c")
.file("src/ffi/shim/symbols.c")
.compile("shim");

2
src/ffi/mod.rs
View File

@ -297,5 +297,3 @@ mod lua;
mod luaconf;
mod lualib;
mod symbols;
pub mod safe;

278
src/ffi/safe.rs
View File

@ -1,278 +0,0 @@
use std::ffi::CString;
use std::os::raw::{c_char, c_int, c_void};
use crate::error::Result;
use crate::util::protect_lua;
use super::lua::{lua_CFunction, lua_Debug, lua_Integer, lua_State};
extern "C" {
#[link_name = "MLUA_WRAPPED_ERROR_SIZE"]
pub static mut WRAPPED_ERROR_SIZE: usize;
#[link_name = "MLUA_WRAPPED_PANIC_SIZE"]
pub static mut WRAPPED_PANIC_SIZE: usize;
#[link_name = "MLUA_WRAPPED_ERROR_KEY"]
pub static mut WRAPPED_ERROR_KEY: *const c_void;
#[link_name = "MLUA_WRAPPED_PANIC_KEY"]
pub static mut WRAPPED_PANIC_KEY: *const c_void;
pub fn lua_call_mlua_hook_proc(L: *mut lua_State, ar: *mut lua_Debug);
pub fn meta_index_impl(state: *mut lua_State) -> c_int;
pub fn meta_newindex_impl(state: *mut lua_State) -> c_int;
pub fn bind_call_impl(state: *mut lua_State) -> c_int;
pub fn error_traceback(state: *mut lua_State) -> c_int;
pub fn lua_nopanic_pcall(state: *mut lua_State) -> c_int;
pub fn lua_nopanic_xpcall(state: *mut lua_State) -> c_int;
fn lua_gc_s(L: *mut lua_State) -> c_int;
fn luaL_ref_s(L: *mut lua_State) -> c_int;
fn lua_pushlstring_s(L: *mut lua_State) -> c_int;
fn lua_tolstring_s(L: *mut lua_State) -> c_int;
fn lua_newthread_s(L: *mut lua_State) -> c_int;
fn lua_newuserdata_s(L: *mut lua_State) -> c_int;
fn lua_newwrappederror_s(L: *mut lua_State) -> c_int;
fn lua_pushcclosure_s(L: *mut lua_State) -> c_int;
fn lua_pushrclosure_s(L: *mut lua_State) -> c_int;
fn luaL_requiref_s(L: *mut lua_State) -> c_int;
fn error_traceback_s(L: *mut lua_State) -> c_int;
fn lua_newtable_s(L: *mut lua_State) -> c_int;
fn lua_createtable_s(L: *mut lua_State) -> c_int;
fn lua_gettable_s(L: *mut lua_State) -> c_int;
fn lua_settable_s(L: *mut lua_State) -> c_int;
fn lua_geti_s(L: *mut lua_State) -> c_int;
fn lua_rawset_s(L: *mut lua_State) -> c_int;
fn lua_rawseti_s(L: *mut lua_State) -> c_int;
fn lua_rawsetp_s(L: *mut lua_State) -> c_int;
fn lua_rawsetfield_s(L: *mut lua_State) -> c_int;
fn lua_rawinsert_s(L: *mut lua_State) -> c_int;
fn lua_rawremove_s(L: *mut lua_State) -> c_int;
fn luaL_len_s(L: *mut lua_State) -> c_int;
fn lua_next_s(L: *mut lua_State) -> c_int;
}
#[repr(C)]
struct StringArg {
data: *const c_char,
len: usize,
}
//
// Common functions
//
// Uses 4 stack spaces
pub unsafe fn lua_gc(state: *mut lua_State, what: c_int, data: c_int) -> Result<c_int> {
super::lua_pushinteger(state, what as lua_Integer);
super::lua_pushinteger(state, data as lua_Integer);
protect_lua(state, 2, lua_gc_s)?;
let ret = super::lua_tointeger(state, -1) as c_int;
super::lua_pop(state, 1);
Ok(ret)
}
// Uses 3 stack spaces
pub unsafe fn luaL_ref(state: *mut lua_State, table: c_int) -> Result<c_int> {
super::lua_pushvalue(state, table);
super::lua_rotate(state, -2, 1);
protect_lua(state, 2, luaL_ref_s)?;
let ret = super::lua_tointeger(state, -1) as c_int;
super::lua_pop(state, 1);
Ok(ret)
}
// Uses 3 stack spaces
pub unsafe fn lua_pushstring<S: AsRef<[u8]> + ?Sized>(state: *mut lua_State, s: &S) -> Result<()> {
let s = s.as_ref();
let s = StringArg {
data: s.as_ptr() as *const c_char,
len: s.len(),
};
super::lua_pushlightuserdata(state, &s as *const StringArg as *mut c_void);
protect_lua(state, 1, lua_pushlstring_s)
}
// Uses 4 stack spaces
pub unsafe fn lua_tolstring(
state: *mut lua_State,
index: c_int,
len: *mut usize,
) -> Result<*const c_char> {
let index = super::lua_absindex(state, index);
super::lua_pushvalue(state, index);
super::lua_pushlightuserdata(state, len as *mut c_void);
protect_lua(state, 2, lua_tolstring_s)?;
let s = super::lua_touserdata(state, -1);
super::lua_pop(state, 1);
super::lua_replace(state, index);
Ok(s as *const c_char)
}
// Uses 2 stack spaces
pub unsafe fn lua_newthread(state: *mut lua_State) -> Result<*mut lua_State> {
protect_lua(state, 0, lua_newthread_s)?;
Ok(super::lua_tothread(state, -1))
}
// Uses 3 stack spaces
pub unsafe fn lua_newuserdata(state: *mut lua_State, size: usize) -> Result<*mut c_void> {
super::lua_pushinteger(state, size as lua_Integer);
protect_lua(state, 1, lua_newuserdata_s)?;
Ok(super::lua_touserdata(state, -1))
}
// Uses 2 stack spaces
pub unsafe fn lua_newwrappederror(state: *mut lua_State) -> Result<*mut c_void> {
protect_lua(state, 0, lua_newwrappederror_s)?;
Ok(super::lua_touserdata(state, -1))
}
// Uses 3 stack spaces
pub unsafe fn lua_pushcclosure(state: *mut lua_State, f: lua_CFunction, n: c_int) -> Result<()> {
super::lua_pushlightuserdata(state, f as *mut c_void);
protect_lua(state, n + 1, lua_pushcclosure_s)
}
// Uses 3 stack spaces
pub unsafe fn lua_pushrclosure(state: *mut lua_State, f: lua_CFunction, n: c_int) -> Result<()> {
super::lua_pushlightuserdata(state, f as *mut c_void);
if n > 0 {
super::lua_rotate(state, -n - 1, 1);
}
protect_lua(state, n + 1, lua_pushrclosure_s)
}
// Uses 5 stack spaces
pub unsafe fn luaL_requiref<S: AsRef<[u8]> + ?Sized>(
state: *mut lua_State,
modname: &S,
openf: lua_CFunction,
glb: c_int,
) -> Result<()> {
let modname = mlua_expect!(CString::new(modname.as_ref()), "modname contains nil bytes");
super::lua_pushlightuserdata(state, modname.as_ptr() as *mut c_void);
super::lua_pushlightuserdata(state, openf as *mut c_void);
super::lua_pushinteger(state, glb as lua_Integer);
protect_lua(state, 3, luaL_requiref_s)
}
// Uses 3 stack spaces
pub unsafe fn error_traceback2(state: *mut lua_State, state2: *mut lua_State) -> Result<()> {
mlua_assert!(
state != state2,
"error_traceback2 must be used with two different states"
);
super::lua_pushlightuserdata(state, state2);
protect_lua(state, 1, error_traceback_s)
}
//
// Table functions
//
// Uses 2 stack spaces
pub unsafe fn lua_newtable(state: *mut lua_State) -> Result<()> {
protect_lua(state, 0, lua_newtable_s)
}
// Uses 4 stack spaces
pub unsafe fn lua_createtable(state: *mut lua_State, narr: c_int, nrec: c_int) -> Result<()> {
super::lua_pushinteger(state, narr as lua_Integer);
super::lua_pushinteger(state, nrec as lua_Integer);
protect_lua(state, 2, lua_createtable_s)
}
// Uses 3 stack spaces
pub unsafe fn lua_gettable(state: *mut lua_State, table: c_int) -> Result<()> {
super::lua_pushvalue(state, table);
super::lua_rotate(state, -2, 1);
protect_lua(state, 2, lua_gettable_s)
}
// Uses 3 stack spaces
pub unsafe fn lua_settable(state: *mut lua_State, table: c_int) -> Result<()> {
super::lua_pushvalue(state, table);
super::lua_rotate(state, -3, 1);
protect_lua(state, 3, lua_settable_s)
}
// Uses 4 stack spaces
pub unsafe fn lua_geti(state: *mut lua_State, table: c_int, i: lua_Integer) -> Result<c_int> {
super::lua_pushvalue(state, table);
super::lua_pushinteger(state, i);
protect_lua(state, 2, lua_geti_s).map(|_| super::lua_type(state, -1))
}
// Uses 3 stack spaces
pub unsafe fn lua_rawset(state: *mut lua_State, table: c_int) -> Result<()> {
super::lua_pushvalue(state, table);
super::lua_rotate(state, -3, 1);
protect_lua(state, 3, lua_rawset_s)
}
// Uses 4 stack spaces
pub unsafe fn lua_rawseti(state: *mut lua_State, table: c_int, i: lua_Integer) -> Result<()> {
super::lua_pushvalue(state, table);
super::lua_rotate(state, -2, 1);
super::lua_pushinteger(state, i);
protect_lua(state, 3, lua_rawseti_s)
}
// Uses 4 stack spaces
pub unsafe fn lua_rawsetp(state: *mut lua_State, table: c_int, ptr: *const c_void) -> Result<()> {
super::lua_pushvalue(state, table);
super::lua_rotate(state, -2, 1);
super::lua_pushlightuserdata(state, ptr as *mut c_void);
protect_lua(state, 3, lua_rawsetp_s)
}
// Uses 4 stack spaces
pub unsafe fn lua_rawsetfield<S>(state: *mut lua_State, table: c_int, field: &S) -> Result<()>
where
S: AsRef<[u8]> + ?Sized,
{
let field = field.as_ref();
let s = StringArg {
data: field.as_ptr() as *const c_char,
len: field.len(),
};
super::lua_pushvalue(state, table);
super::lua_pushlightuserdata(state, &s as *const StringArg as *mut c_void);
super::lua_rotate(state, -3, 2);
protect_lua(state, 3, lua_rawsetfield_s)
}
// Uses 4 stack spaces
pub unsafe fn lua_rawinsert(state: *mut lua_State, table: c_int, i: lua_Integer) -> Result<()> {
super::lua_pushvalue(state, table);
super::lua_rotate(state, -2, 1);
super::lua_pushinteger(state, i);
protect_lua(state, 3, lua_rawinsert_s)
}
// Uses 4 stack spaces
pub unsafe fn lua_rawremove(state: *mut lua_State, table: c_int, i: lua_Integer) -> Result<()> {
super::lua_pushvalue(state, table);
super::lua_pushinteger(state, i);
protect_lua(state, 2, lua_rawremove_s)
}
// Uses 3 stack spaces
pub unsafe fn luaL_len(state: *mut lua_State, table: c_int) -> Result<lua_Integer> {
super::lua_pushvalue(state, table);
protect_lua(state, 1, luaL_len_s)?;
let ret = super::lua_tointeger(state, -1);
super::lua_pop(state, 1);
Ok(ret)
}
// Uses 3 stack spaces
pub unsafe fn lua_next(state: *mut lua_State, table: c_int) -> Result<lua_Integer> {
super::lua_pushvalue(state, table);
super::lua_rotate(state, -2, 1);
protect_lua(state, 2, lua_next_s)?;
let ret = super::lua_tointeger(state, -1);
super::lua_pop(state, 1);
Ok(ret)
}

953
src/ffi/shim/compat-5.3.c
View File

@ -1,953 +0,0 @@
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include "compat-5.3.h"
/* don't compile it again if it already is included via compat53.h */
#ifndef COMPAT53_C_
#define COMPAT53_C_
/* definitions for Lua 5.1 only */
#if defined(LUA_VERSION_NUM) && LUA_VERSION_NUM == 501
#ifndef COMPAT53_FOPEN_NO_LOCK
# if defined(_MSC_VER)
# define COMPAT53_FOPEN_NO_LOCK 1
# else /* otherwise */
# define COMPAT53_FOPEN_NO_LOCK 0
# endif /* VC++ only so far */
#endif /* No-lock fopen_s usage if possible */
#if defined(_MSC_VER) && COMPAT53_FOPEN_NO_LOCK
# include <share.h>
#endif /* VC++ _fsopen for share-allowed file read */
#ifndef COMPAT53_HAVE_STRERROR_R
# if (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L) || \
(defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 600) || \
defined(__APPLE__)
# define COMPAT53_HAVE_STRERROR_R 1
# else /* none of the defines matched: define to 0 */
# define COMPAT53_HAVE_STRERROR_R 0
# endif /* have strerror_r of some form */
#endif /* strerror_r */
#ifndef COMPAT53_HAVE_STRERROR_S
# if defined(_MSC_VER) || (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L && \
defined(__STDC_LIB_EXT1__) && __STDC_LIB_EXT1__)
# define COMPAT53_HAVE_STRERROR_S 1
# else /* not VC++ or C11 */
# define COMPAT53_HAVE_STRERROR_S 0
# endif /* strerror_s from VC++ or C11 */
#endif /* strerror_s */
#ifndef COMPAT53_LUA_FILE_BUFFER_SIZE
# define COMPAT53_LUA_FILE_BUFFER_SIZE 4096
#endif /* Lua File Buffer Size */
static char* compat53_strerror (int en, char* buff, size_t sz) {
#if COMPAT53_HAVE_STRERROR_R
/* use strerror_r here, because it's available on these specific platforms */
if (sz > 0) {
buff[0] = '\0';
/* we don't care whether the GNU version or the XSI version is used: */
if (strerror_r(en, buff, sz)) {
/* Yes, we really DO want to ignore the return value!
* GCC makes that extra hard, not even a (void) cast will do. */
}
if (buff[0] == '\0') {
/* Buffer is unchanged, so we probably have called GNU strerror_r which
* returned a static constant string. Chances are that strerror will
* return the same static constant string and therefore be thread-safe. */
return strerror(en);
}
}
return buff; /* sz is 0 *or* strerror_r wrote into the buffer */
#elif COMPAT53_HAVE_STRERROR_S
/* for MSVC and other C11 implementations, use strerror_s since it's
* provided by default by the libraries */
strerror_s(buff, sz, en);
return buff;
#else
/* fallback, but strerror is not guaranteed to be threadsafe due to modifying
* errno itself and some impls not locking a static buffer for it ... but most
* known systems have threadsafe errno: this might only change if the locale
* is changed out from under someone while this function is being called */
(void)buff;
(void)sz;
return strerror(en);
#endif
}
COMPAT53_API int lua_absindex (lua_State *L, int i) {
if (i < 0 && i > LUA_REGISTRYINDEX)
i += lua_gettop(L) + 1;
return i;
}
static void compat53_call_lua (lua_State *L, char const code[], size_t len,
int nargs, int nret) {
lua_rawgetp(L, LUA_REGISTRYINDEX, (void*)code);
if (lua_type(L, -1) != LUA_TFUNCTION) {
lua_pop(L, 1);
if (luaL_loadbuffer(L, code, len, "=none"))
lua_error(L);
lua_pushvalue(L, -1);
lua_rawsetp(L, LUA_REGISTRYINDEX, (void*)code);
}
lua_insert(L, -nargs-1);
lua_call(L, nargs, nret);
}
static const char compat53_arith_code[] =
"local op,a,b=...\n"
"if op==0 then return a+b\n"
"elseif op==1 then return a-b\n"
"elseif op==2 then return a*b\n"
"elseif op==3 then return a/b\n"
"elseif op==4 then return a%b\n"
"elseif op==5 then return a^b\n"
"elseif op==6 then return -a\n"
"end\n";
COMPAT53_API void lua_arith (lua_State *L, int op) {
if (op < LUA_OPADD || op > LUA_OPUNM)
luaL_error(L, "invalid 'op' argument for lua_arith");
luaL_checkstack(L, 5, "not enough stack slots");
if (op == LUA_OPUNM)
lua_pushvalue(L, -1);
lua_pushnumber(L, op);
lua_insert(L, -3);
compat53_call_lua(L, compat53_arith_code,
sizeof(compat53_arith_code)-1, 3, 1);
}
static const char compat53_compare_code[] =
"local a,b=...\n"
"return a<=b\n";
COMPAT53_API int lua_compare (lua_State *L, int idx1, int idx2, int op) {
int result = 0;
switch (op) {
case LUA_OPEQ:
return lua_equal(L, idx1, idx2);
case LUA_OPLT:
return lua_lessthan(L, idx1, idx2);
case LUA_OPLE:
luaL_checkstack(L, 5, "not enough stack slots");
idx1 = lua_absindex(L, idx1);
idx2 = lua_absindex(L, idx2);
lua_pushvalue(L, idx1);
lua_pushvalue(L, idx2);
compat53_call_lua(L, compat53_compare_code,
sizeof(compat53_compare_code)-1, 2, 1);
result = lua_toboolean(L, -1);
lua_pop(L, 1);
return result;
default:
luaL_error(L, "invalid 'op' argument for lua_compare");
}
return 0;
}
COMPAT53_API void lua_copy (lua_State *L, int from, int to) {
int abs_to = lua_absindex(L, to);
luaL_checkstack(L, 1, "not enough stack slots");
lua_pushvalue(L, from);
lua_replace(L, abs_to);
}
COMPAT53_API void lua_len (lua_State *L, int i) {
switch (lua_type(L, i)) {
case LUA_TSTRING:
lua_pushnumber(L, (lua_Number)lua_objlen(L, i));
break;
case LUA_TTABLE:
if (!luaL_callmeta(L, i, "__len"))
lua_pushnumber(L, (lua_Number)lua_objlen(L, i));
break;
case LUA_TUSERDATA:
if (luaL_callmeta(L, i, "__len"))
break;
/* FALLTHROUGH */
default:
luaL_error(L, "attempt to get length of a %s value",
lua_typename(L, lua_type(L, i)));
}
}
COMPAT53_API int lua_rawgetp (lua_State *L, int i, const void *p) {
int abs_i = lua_absindex(L, i);
lua_pushlightuserdata(L, (void*)p);
lua_rawget(L, abs_i);
return lua_type(L, -1);
}
COMPAT53_API void lua_rawsetp (lua_State *L, int i, const void *p) {
int abs_i = lua_absindex(L, i);
luaL_checkstack(L, 1, "not enough stack slots");
lua_pushlightuserdata(L, (void*)p);
lua_insert(L, -2);
lua_rawset(L, abs_i);
}
COMPAT53_API lua_Number lua_tonumberx (lua_State *L, int i, int *isnum) {
lua_Number n = lua_tonumber(L, i);
if (isnum != NULL) {
*isnum = (n != 0 || lua_isnumber(L, i));
}
return n;
}
COMPAT53_API void luaL_checkversion (lua_State *L) {
(void)L;
}
COMPAT53_API void luaL_checkstack (lua_State *L, int sp, const char *msg) {
if (!lua_checkstack(L, sp+LUA_MINSTACK)) {
if (msg != NULL)
luaL_error(L, "stack overflow (%s)", msg);
else {
lua_pushliteral(L, "stack overflow");
lua_error(L);
}
}
}
COMPAT53_API int luaL_getsubtable (lua_State *L, int i, const char *name) {
int abs_i = lua_absindex(L, i);
luaL_checkstack(L, 3, "not enough stack slots");
lua_pushstring(L, name);
lua_gettable(L, abs_i);
if (lua_istable(L, -1))
return 1;
lua_pop(L, 1);
lua_newtable(L);
lua_pushstring(L, name);
lua_pushvalue(L, -2);
lua_settable(L, abs_i);
return 0;
}
COMPAT53_API lua_Integer luaL_len (lua_State *L, int i) {
lua_Integer res = 0;
int isnum = 0;
luaL_checkstack(L, 1, "not enough stack slots");
lua_len(L, i);
res = lua_tointegerx(L, -1, &isnum);
lua_pop(L, 1);
if (!isnum)
luaL_error(L, "object length is not an integer");
return res;
}
COMPAT53_API void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
luaL_checkstack(L, nup+1, "too many upvalues");
for (; l->name != NULL; l++) { /* fill the table with given functions */
int i;
lua_pushstring(L, l->name);
for (i = 0; i < nup; i++) /* copy upvalues to the top */
lua_pushvalue(L, -(nup + 1));
lua_pushcclosure(L, l->func, nup); /* closure with those upvalues */
lua_settable(L, -(nup + 3)); /* table must be below the upvalues, the name and the closure */
}
lua_pop(L, nup); /* remove upvalues */
}
COMPAT53_API void luaL_setmetatable (lua_State *L, const char *tname) {
luaL_checkstack(L, 1, "not enough stack slots");
luaL_getmetatable(L, tname);
lua_setmetatable(L, -2);
}
COMPAT53_API void *luaL_testudata (lua_State *L, int i, const char *tname) {
void *p = lua_touserdata(L, i);
luaL_checkstack(L, 2, "not enough stack slots");
if (p == NULL || !lua_getmetatable(L, i))
return NULL;
else {
int res = 0;
luaL_getmetatable(L, tname);
res = lua_rawequal(L, -1, -2);
lua_pop(L, 2);
if (!res)
p = NULL;
}
return p;
}
static int compat53_countlevels (lua_State *L) {
lua_Debug ar;
int li = 1, le = 1;
/* find an upper bound */
while (lua_getstack(L, le, &ar)) { li = le; le *= 2; }
/* do a binary search */
while (li < le) {
int m = (li + le)/2;
if (lua_getstack(L, m, &ar)) li = m + 1;
else le = m;
}
return le - 1;
}
static int compat53_findfield (lua_State *L, int objidx, int level) {
if (level == 0 || !lua_istable(L, -1))
return 0; /* not found */
lua_pushnil(L); /* start 'next' loop */
while (lua_next(L, -2)) { /* for each pair in table */
if (lua_type(L, -2) == LUA_TSTRING) { /* ignore non-string keys */
if (lua_rawequal(L, objidx, -1)) { /* found object? */
lua_pop(L, 1); /* remove value (but keep name) */
return 1;
}
else if (compat53_findfield(L, objidx, level - 1)) { /* try recursively */
lua_remove(L, -2); /* remove table (but keep name) */
lua_pushliteral(L, ".");
lua_insert(L, -2); /* place '.' between the two names */
lua_concat(L, 3);
return 1;
}
}
lua_pop(L, 1); /* remove value */
}
return 0; /* not found */
}
static int compat53_pushglobalfuncname (lua_State *L, lua_Debug *ar) {
int top = lua_gettop(L);
lua_getinfo(L, "f", ar); /* push function */
lua_pushvalue(L, LUA_GLOBALSINDEX);
if (compat53_findfield(L, top + 1, 2)) {
lua_copy(L, -1, top + 1); /* move name to proper place */
lua_pop(L, 2); /* remove pushed values */
return 1;
}
else {
lua_settop(L, top); /* remove function and global table */
return 0;
}
}
static void compat53_pushfuncname (lua_State *L, lua_Debug *ar) {
if (*ar->namewhat != '\0') /* is there a name? */
lua_pushfstring(L, "function " LUA_QS, ar->name);
else if (*ar->what == 'm') /* main? */
lua_pushliteral(L, "main chunk");
else if (*ar->what == 'C') {
if (compat53_pushglobalfuncname(L, ar)) {
lua_pushfstring(L, "function " LUA_QS, lua_tostring(L, -1));
lua_remove(L, -2); /* remove name */
}
else
lua_pushliteral(L, "?");
}
else
lua_pushfstring(L, "function <%s:%d>", ar->short_src, ar->linedefined);
}
#define COMPAT53_LEVELS1 12 /* size of the first part of the stack */
#define COMPAT53_LEVELS2 10 /* size of the second part of the stack */
COMPAT53_API void luaL_traceback (lua_State *L, lua_State *L1,
const char *msg, int level) {
lua_Debug ar;
int top = lua_gettop(L);
int numlevels = compat53_countlevels(L1);
int mark = (numlevels > COMPAT53_LEVELS1 + COMPAT53_LEVELS2) ? COMPAT53_LEVELS1 : 0;
if (msg) lua_pushfstring(L, "%s\n", msg);
lua_pushliteral(L, "stack traceback:");
while (lua_getstack(L1, level++, &ar)) {
if (level == mark) { /* too many levels? */
lua_pushliteral(L, "\n\t..."); /* add a '...' */
level = numlevels - COMPAT53_LEVELS2; /* and skip to last ones */
}
else {
lua_getinfo(L1, "Slnt", &ar);
lua_pushfstring(L, "\n\t%s:", ar.short_src);
if (ar.currentline > 0)
lua_pushfstring(L, "%d:", ar.currentline);
lua_pushliteral(L, " in ");
compat53_pushfuncname(L, &ar);
lua_concat(L, lua_gettop(L) - top);
}
}
lua_concat(L, lua_gettop(L) - top);
}
COMPAT53_API int luaL_fileresult (lua_State *L, int stat, const char *fname) {
const char *serr = NULL;
int en = errno; /* calls to Lua API may change this value */
char buf[512] = { 0 };
if (stat) {
lua_pushboolean(L, 1);
return 1;
}
else {
lua_pushnil(L);
serr = compat53_strerror(en, buf, sizeof(buf));
if (fname)
lua_pushfstring(L, "%s: %s", fname, serr);
else
lua_pushstring(L, serr);
lua_pushnumber(L, (lua_Number)en);
return 3;
}
}
static int compat53_checkmode (lua_State *L, const char *mode, const char *modename, int err) {
if (mode && strchr(mode, modename[0]) == NULL) {
lua_pushfstring(L, "attempt to load a %s chunk (mode is '%s')", modename, mode);
return err;
}
return LUA_OK;
}
typedef struct {
lua_Reader reader;
void *ud;
int has_peeked_data;
const char *peeked_data;
size_t peeked_data_size;
} compat53_reader_data;
static const char *compat53_reader (lua_State *L, void *ud, size_t *size) {
compat53_reader_data *data = (compat53_reader_data *)ud;
if (data->has_peeked_data) {
data->has_peeked_data = 0;
*size = data->peeked_data_size;
return data->peeked_data;
} else
return data->reader(L, data->ud, size);
}
COMPAT53_API int lua_load (lua_State *L, lua_Reader reader, void *data, const char *source, const char *mode) {
int status = LUA_OK;
compat53_reader_data compat53_data = { 0, NULL, 1, 0, 0 };
compat53_data.reader = reader;
compat53_data.ud = data;
compat53_data.peeked_data = reader(L, data, &(compat53_data.peeked_data_size));
if (compat53_data.peeked_data && compat53_data.peeked_data_size &&
compat53_data.peeked_data[0] == LUA_SIGNATURE[0]) /* binary file? */
status = compat53_checkmode(L, mode, "binary", LUA_ERRSYNTAX);
else
status = compat53_checkmode(L, mode, "text", LUA_ERRSYNTAX);
if (status != LUA_OK)
return status;
/* we need to call the original 5.1 version of lua_load! */
#undef lua_load
return lua_load(L, compat53_reader, &compat53_data, source);
#define lua_load COMPAT53_CONCAT(COMPAT53_PREFIX, _load_53)
}
typedef struct {
int n; /* number of pre-read characters */
FILE *f; /* file being read */
char buff[COMPAT53_LUA_FILE_BUFFER_SIZE]; /* area for reading file */
} compat53_LoadF;
static const char *compat53_getF (lua_State *L, void *ud, size_t *size) {
compat53_LoadF *lf = (compat53_LoadF *)ud;
(void)L; /* not used */
if (lf->n > 0) { /* are there pre-read characters to be read? */
*size = lf->n; /* return them (chars already in buffer) */
lf->n = 0; /* no more pre-read characters */
}
else { /* read a block from file */
/* 'fread' can return > 0 *and* set the EOF flag. If next call to
'compat53_getF' called 'fread', it might still wait for user input.
The next check avoids this problem. */
if (feof(lf->f)) return NULL;
*size = fread(lf->buff, 1, sizeof(lf->buff), lf->f); /* read block */
}
return lf->buff;
}
static int compat53_errfile (lua_State *L, const char *what, int fnameindex) {
char buf[512] = {0};
const char *serr = compat53_strerror(errno, buf, sizeof(buf));
const char *filename = lua_tostring(L, fnameindex) + 1;
lua_pushfstring(L, "cannot %s %s: %s", what, filename, serr);
lua_remove(L, fnameindex);
return LUA_ERRFILE;
}
static int compat53_skipBOM (compat53_LoadF *lf) {
const char *p = "\xEF\xBB\xBF"; /* UTF-8 BOM mark */
int c;
lf->n = 0;
do {
c = getc(lf->f);
if (c == EOF || c != *(const unsigned char *)p++) return c;
lf->buff[lf->n++] = (char)c; /* to be read by the parser */
} while (*p != '\0');
lf->n = 0; /* prefix matched; discard it */
return getc(lf->f); /* return next character */
}
/*
** reads the first character of file 'f' and skips an optional BOM mark
** in its beginning plus its first line if it starts with '#'. Returns
** true if it skipped the first line. In any case, '*cp' has the
** first "valid" character of the file (after the optional BOM and
** a first-line comment).
*/
static int compat53_skipcomment (compat53_LoadF *lf, int *cp) {
int c = *cp = compat53_skipBOM(lf);
if (c == '#') { /* first line is a comment (Unix exec. file)? */
do { /* skip first line */
c = getc(lf->f);
} while (c != EOF && c != '\n');
*cp = getc(lf->f); /* skip end-of-line, if present */
return 1; /* there was a comment */
}
else return 0; /* no comment */
}
COMPAT53_API int luaL_loadfilex (lua_State *L, const char *filename, const char *mode) {
compat53_LoadF lf;
int status, readstatus;
int c;
int fnameindex = lua_gettop(L) + 1; /* index of filename on the stack */
if (filename == NULL) {
lua_pushliteral(L, "=stdin");
lf.f = stdin;
}
else {
lua_pushfstring(L, "@%s", filename);
#if defined(_MSC_VER)
/* This code is here to stop a deprecation error that stops builds
* if a certain macro is defined. While normally not caring would
* be best, some header-only libraries and builds can't afford to
* dictate this to the user. A quick check shows that fopen_s this
* goes back to VS 2005, and _fsopen goes back to VS 2003 .NET,
* possibly even before that so we don't need to do any version
* number checks, since this has been there since forever. */
/* TO USER: if you want the behavior of typical fopen_s/fopen,
* which does lock the file on VC++, define the macro used below to 0 */
#if COMPAT53_FOPEN_NO_LOCK
lf.f = _fsopen(filename, "r", _SH_DENYNO); /* do not lock the file in any way */
if (lf.f == NULL)
return compat53_errfile(L, "open", fnameindex);
#else /* use default locking version */
if (fopen_s(&lf.f, filename, "r") != 0)
return compat53_errfile(L, "open", fnameindex);
#endif /* Locking vs. No-locking fopen variants */
#else
lf.f = fopen(filename, "r"); /* default stdlib doesn't forcefully lock files here */
if (lf.f == NULL) return compat53_errfile(L, "open", fnameindex);
#endif
}
if (compat53_skipcomment(&lf, &c)) /* read initial portion */
lf.buff[lf.n++] = '\n'; /* add line to correct line numbers */
if (c == LUA_SIGNATURE[0] && filename) { /* binary file? */
#if defined(_MSC_VER)
if (freopen_s(&lf.f, filename, "rb", lf.f) != 0)
return compat53_errfile(L, "reopen", fnameindex);
#else
lf.f = freopen(filename, "rb", lf.f); /* reopen in binary mode */
if (lf.f == NULL) return compat53_errfile(L, "reopen", fnameindex);
#endif
compat53_skipcomment(&lf, &c); /* re-read initial portion */
}
if (c != EOF)
lf.buff[lf.n++] = (char)c; /* 'c' is the first character of the stream */
status = lua_load(L, &compat53_getF, &lf, lua_tostring(L, -1), mode);
readstatus = ferror(lf.f);
if (filename) fclose(lf.f); /* close file (even in case of errors) */
if (readstatus) {
lua_settop(L, fnameindex); /* ignore results from 'lua_load' */
return compat53_errfile(L, "read", fnameindex);
}
lua_remove(L, fnameindex);
return status;
}
COMPAT53_API int luaL_loadbufferx (lua_State *L, const char *buff, size_t sz, const char *name, const char *mode) {
int status = LUA_OK;
if (sz > 0 && buff[0] == LUA_SIGNATURE[0]) {
status = compat53_checkmode(L, mode, "binary", LUA_ERRSYNTAX);
}
else {
status = compat53_checkmode(L, mode, "text", LUA_ERRSYNTAX);
}
if (status != LUA_OK)
return status;
return luaL_loadbuffer(L, buff, sz, name);
}
#if !defined(l_inspectstat) && \
(defined(unix) || defined(__unix) || defined(__unix__) || \
defined(__TOS_AIX__) || defined(_SYSTYPE_BSD) || \
(defined(__APPLE__) && defined(__MACH__)))
/* some form of unix; check feature macros in unistd.h for details */
# include <unistd.h>
/* check posix version; the relevant include files and macros probably
* were available before 2001, but I'm not sure */
# if defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L
# include <sys/wait.h>
# define l_inspectstat(stat,what) \
if (WIFEXITED(stat)) { stat = WEXITSTATUS(stat); } \
else if (WIFSIGNALED(stat)) { stat = WTERMSIG(stat); what = "signal"; }
# endif
#endif
/* provide default (no-op) version */
#if !defined(l_inspectstat)
# define l_inspectstat(stat,what) ((void)0)
#endif
COMPAT53_API int luaL_execresult (lua_State *L, int stat) {
const char *what = "exit";
if (stat == -1)
return luaL_fileresult(L, 0, NULL);
else {
l_inspectstat(stat, what);
if (*what == 'e' && stat == 0)
lua_pushboolean(L, 1);
else
lua_pushnil(L);
lua_pushstring(L, what);
lua_pushinteger(L, stat);
return 3;
}
}
COMPAT53_API void luaL_buffinit (lua_State *L, luaL_Buffer_53 *B) {
/* make it crash if used via pointer to a 5.1-style luaL_Buffer */
B->b.p = NULL;
B->b.L = NULL;
B->b.lvl = 0;
/* reuse the buffer from the 5.1-style luaL_Buffer though! */
B->ptr = B->b.buffer;
B->capacity = LUAL_BUFFERSIZE;
B->nelems = 0;
B->L2 = L;
}
COMPAT53_API char *luaL_prepbuffsize (luaL_Buffer_53 *B, size_t s) {
if (B->capacity - B->nelems < s) { /* needs to grow */
char* newptr = NULL;
size_t newcap = B->capacity * 2;
if (newcap - B->nelems < s)
newcap = B->nelems + s;
if (newcap < B->capacity) /* overflow */
luaL_error(B->L2, "buffer too large");
newptr = (char*)lua_newuserdata(B->L2, newcap);
memcpy(newptr, B->ptr, B->nelems);
if (B->ptr != B->b.buffer)
lua_replace(B->L2, -2); /* remove old buffer */
B->ptr = newptr;
B->capacity = newcap;
}
return B->ptr+B->nelems;
}
COMPAT53_API void luaL_addlstring (luaL_Buffer_53 *B, const char *s, size_t l) {
memcpy(luaL_prepbuffsize(B, l), s, l);
luaL_addsize(B, l);
}
COMPAT53_API void luaL_addvalue (luaL_Buffer_53 *B) {
size_t len = 0;
const char *s = lua_tolstring(B->L2, -1, &len);
if (!s)
luaL_error(B->L2, "cannot convert value to string");
if (B->ptr != B->b.buffer)
lua_insert(B->L2, -2); /* userdata buffer must be at stack top */
luaL_addlstring(B, s, len);
lua_remove(B->L2, B->ptr != B->b.buffer ? -2 : -1);
}
void luaL_pushresult (luaL_Buffer_53 *B) {
lua_pushlstring(B->L2, B->ptr, B->nelems);
if (B->ptr != B->b.buffer)
lua_replace(B->L2, -2); /* remove userdata buffer */
}
#endif /* Lua 5.1 */
/* definitions for Lua 5.1 and Lua 5.2 */
#if defined( LUA_VERSION_NUM ) && LUA_VERSION_NUM <= 502
COMPAT53_API int lua_geti (lua_State *L, int index, lua_Integer i) {
index = lua_absindex(L, index);
lua_pushinteger(L, i);
lua_gettable(L, index);
return lua_type(L, -1);
}
#ifndef LUA_EXTRASPACE
#define LUA_EXTRASPACE (sizeof(void*))
#endif
COMPAT53_API void *lua_getextraspace (lua_State *L) {
int is_main = 0;
void *ptr = NULL;
luaL_checkstack(L, 4, "not enough stack slots available");
lua_pushliteral(L, "__compat53_extraspace");
lua_pushvalue(L, -1);
lua_rawget(L, LUA_REGISTRYINDEX);
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
lua_createtable(L, 0, 2);
lua_createtable(L, 0, 1);
lua_pushliteral(L, "k");
lua_setfield(L, -2, "__mode");
lua_setmetatable(L, -2);
lua_pushvalue(L, -2);
lua_pushvalue(L, -2);
lua_rawset(L, LUA_REGISTRYINDEX);
}
lua_replace(L, -2);
is_main = lua_pushthread(L);
lua_rawget(L, -2);
ptr = lua_touserdata(L, -1);
if (!ptr) {
lua_pop(L, 1);
ptr = lua_newuserdata(L, LUA_EXTRASPACE);
if (is_main) {
memset(ptr, '\0', LUA_EXTRASPACE);
lua_pushthread(L);
lua_pushvalue(L, -2);
lua_rawset(L, -4);
lua_pushboolean(L, 1);
lua_pushvalue(L, -2);
lua_rawset(L, -4);
} else {
void* mptr = NULL;
lua_pushboolean(L, 1);
lua_rawget(L, -3);
mptr = lua_touserdata(L, -1);
if (mptr)
memcpy(ptr, mptr, LUA_EXTRASPACE);
else
memset(ptr, '\0', LUA_EXTRASPACE);
lua_pop(L, 1);
lua_pushthread(L);
lua_pushvalue(L, -2);
lua_rawset(L, -4);
}
}
lua_pop(L, 2);
return ptr;
}
COMPAT53_API int lua_isinteger (lua_State *L, int index) {
if (lua_type(L, index) == LUA_TNUMBER) {
lua_Number n = lua_tonumber(L, index);
lua_Integer i = lua_tointeger(L, index);
if (i == n)
return 1;
}
return 0;
}
COMPAT53_API lua_Integer lua_tointegerx (lua_State *L, int i, int *isnum) {
int ok = 0;
lua_Number n = lua_tonumberx(L, i, &ok);
if (ok) {
if (n == (lua_Integer)n) {
if (isnum)
*isnum = 1;
return (lua_Integer)n;
}
}
if (isnum)
*isnum = 0;
return 0;
}
static void compat53_reverse (lua_State *L, int a, int b) {
for (; a < b; ++a, --b) {
lua_pushvalue(L, a);
lua_pushvalue(L, b);
lua_replace(L, a);
lua_replace(L, b);
}
}
COMPAT53_API void lua_rotate (lua_State *L, int idx, int n) {
int n_elems = 0;
idx = lua_absindex(L, idx);
n_elems = lua_gettop(L)-idx+1;
if (n < 0)
n += n_elems;
if ( n > 0 && n < n_elems) {
luaL_checkstack(L, 2, "not enough stack slots available");
n = n_elems - n;
compat53_reverse(L, idx, idx+n-1);
compat53_reverse(L, idx+n, idx+n_elems-1);
compat53_reverse(L, idx, idx+n_elems-1);
}
}
COMPAT53_API void lua_seti (lua_State *L, int index, lua_Integer i) {
luaL_checkstack(L, 1, "not enough stack slots available");
index = lua_absindex(L, index);
lua_pushinteger(L, i);
lua_insert(L, -2);
lua_settable(L, index);
}
#if !defined(lua_str2number)
# define lua_str2number(s, p) strtod((s), (p))
#endif
COMPAT53_API size_t lua_stringtonumber (lua_State *L, const char *s) {
char* endptr;
lua_Number n = lua_str2number(s, &endptr);
if (endptr != s) {
while (*endptr != '\0' && isspace((unsigned char)*endptr))
++endptr;
if (*endptr == '\0') {
lua_pushnumber(L, n);
return endptr - s + 1;
}
}
return 0;
}
COMPAT53_API const char *luaL_tolstring (lua_State *L, int idx, size_t *len) {
if (!luaL_callmeta(L, idx, "__tostring")) {
int t = lua_type(L, idx), tt = 0;
char const* name = NULL;
switch (t) {
case LUA_TNIL:
lua_pushliteral(L, "nil");
break;
case LUA_TSTRING:
case LUA_TNUMBER:
lua_pushvalue(L, idx);
break;
case LUA_TBOOLEAN:
if (lua_toboolean(L, idx))
lua_pushliteral(L, "true");
else
lua_pushliteral(L, "false");
break;
default:
tt = luaL_getmetafield(L, idx, "__name");
name = (tt == LUA_TSTRING) ? lua_tostring(L, -1) : lua_typename(L, t);
lua_pushfstring(L, "%s: %p", name, lua_topointer(L, idx));
if (tt != LUA_TNIL)
lua_replace(L, -2);
break;
}
} else {
if (!lua_isstring(L, -1))
luaL_error(L, "'__tostring' must return a string");
}
return lua_tolstring(L, -1, len);
}
COMPAT53_API void luaL_requiref (lua_State *L, const char *modname,
lua_CFunction openf, int glb) {
luaL_checkstack(L, 3, "not enough stack slots available");
luaL_getsubtable(L, LUA_REGISTRYINDEX, "_LOADED");
if (lua_getfield(L, -1, modname) == LUA_TNIL) {
lua_pop(L, 1);
lua_pushcfunction(L, openf);
lua_pushstring(L, modname);
#ifndef COMPAT53_LUAJIT
lua_call(L, 1, 1);
lua_pushvalue(L, -1);
lua_setfield(L, -3, modname);
#else
lua_call(L, 1, 0);
lua_getfield(L, -1, modname);
#endif /* COMPAT53_LUAJIT */
}
if (glb) {
lua_pushvalue(L, -1);
lua_setglobal(L, modname);
}
lua_replace(L, -2);
}
#endif /* Lua 5.1 and 5.2 */
#endif /* COMPAT53_C_ */
/*********************************************************************
* This file contains parts of Lua 5.2's and Lua 5.3's source code:
*
* Copyright (C) 1994-2014 Lua.org, PUC-Rio.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*********************************************************************/

424
src/ffi/shim/compat-5.3.h
View File

@ -1,424 +0,0 @@
#ifndef COMPAT53_H_
#define COMPAT53_H_
#include <stddef.h>
#include <limits.h>
#include <string.h>
#if defined(__cplusplus) && !defined(COMPAT53_LUA_CPP)
extern "C" {
#endif
#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
#if defined(__cplusplus) && !defined(COMPAT53_LUA_CPP)
}
#endif
#undef COMPAT53_INCLUDE_SOURCE
#if defined(COMPAT53_PREFIX)
/* - change the symbol names of functions to avoid linker conflicts
* - compat-5.3.c needs to be compiled (and linked) separately
*/
# if !defined(COMPAT53_API)
# define COMPAT53_API extern
# endif
#else /* COMPAT53_PREFIX */
/* - make all functions static and include the source.
* - compat-5.3.c doesn't need to be compiled (and linked) separately
*/
# define COMPAT53_PREFIX compat53
# undef COMPAT53_API
# if defined(__GNUC__) || defined(__clang__)
# define COMPAT53_API __attribute__((__unused__)) static
# else
# define COMPAT53_API static
# endif
# define COMPAT53_INCLUDE_SOURCE
#endif /* COMPAT53_PREFIX */
#define COMPAT53_CONCAT_HELPER(a, b) a##b
#define COMPAT53_CONCAT(a, b) COMPAT53_CONCAT_HELPER(a, b)
/* declarations for Lua 5.1 */
#if defined(LUA_VERSION_NUM) && LUA_VERSION_NUM == 501
/* XXX not implemented:
* lua_arith (new operators)
* lua_upvalueid
* lua_upvaluejoin
* lua_version
* lua_yieldk
*/
#ifndef LUA_OK
# define LUA_OK 0
#endif
#ifndef LUA_OPADD
# define LUA_OPADD 0
#endif
#ifndef LUA_OPSUB
# define LUA_OPSUB 1
#endif
#ifndef LUA_OPMUL
# define LUA_OPMUL 2
#endif
#ifndef LUA_OPDIV
# define LUA_OPDIV 3
#endif
#ifndef LUA_OPMOD
# define LUA_OPMOD 4
#endif
#ifndef LUA_OPPOW
# define LUA_OPPOW 5
#endif
#ifndef LUA_OPUNM
# define LUA_OPUNM 6
#endif
#ifndef LUA_OPEQ
# define LUA_OPEQ 0
#endif
#ifndef LUA_OPLT
# define LUA_OPLT 1
#endif
#ifndef LUA_OPLE
# define LUA_OPLE 2
#endif
/* LuaJIT/Lua 5.1 does not have the updated
* error codes for thread status/function returns (but some patched versions do)
* define it only if it's not found
*/
#if !defined(LUA_ERRGCMM)
/* Use + 2 because in some versions of Lua (Lua 5.1)
* LUA_ERRFILE is defined as (LUA_ERRERR+1)
* so we need to avoid it (LuaJIT might have something at this
* integer value too)
*/
# define LUA_ERRGCMM (LUA_ERRERR + 2)
#endif /* LUA_ERRGCMM define */
typedef size_t lua_Unsigned;
typedef struct luaL_Buffer_53 {
luaL_Buffer b; /* make incorrect code crash! */
char *ptr;
size_t nelems;
size_t capacity;
lua_State *L2;
} luaL_Buffer_53;
#define luaL_Buffer luaL_Buffer_53
/* In PUC-Rio 5.1, userdata is a simple FILE*
* In LuaJIT, it's a struct where the first member is a FILE*
* We can't support the `closef` member
*/
typedef struct luaL_Stream {
FILE *f;
} luaL_Stream;
#define lua_absindex COMPAT53_CONCAT(COMPAT53_PREFIX, _absindex)
COMPAT53_API int lua_absindex (lua_State *L, int i);
#define lua_arith COMPAT53_CONCAT(COMPAT53_PREFIX, _arith)
COMPAT53_API void lua_arith (lua_State *L, int op);
#define lua_compare COMPAT53_CONCAT(COMPAT53_PREFIX, _compare)
COMPAT53_API int lua_compare (lua_State *L, int idx1, int idx2, int op);
#define lua_copy COMPAT53_CONCAT(COMPAT53_PREFIX, _copy)
COMPAT53_API void lua_copy (lua_State *L, int from, int to);
#define lua_getuservalue(L, i) \
(lua_getfenv((L), (i)), lua_type((L), -1))
#define lua_setuservalue(L, i) \
(luaL_checktype((L), -1, LUA_TTABLE), lua_setfenv((L), (i)))
#define lua_len COMPAT53_CONCAT(COMPAT53_PREFIX, _len)
COMPAT53_API void lua_len (lua_State *L, int i);
#define lua_pushstring(L, s) \
(lua_pushstring((L), (s)), lua_tostring((L), -1))
#define lua_pushlstring(L, s, len) \
((((len) == 0) ? lua_pushlstring((L), "", 0) : lua_pushlstring((L), (s), (len))), lua_tostring((L), -1))
#ifndef luaL_newlibtable
# define luaL_newlibtable(L, l) \
(lua_createtable((L), 0, sizeof((l))/sizeof(*(l))-1))
#endif
#ifndef luaL_newlib
# define luaL_newlib(L, l) \
(luaL_newlibtable((L), (l)), luaL_register((L), NULL, (l)))
#endif
#define lua_pushglobaltable(L) \
lua_pushvalue((L), LUA_GLOBALSINDEX)
#define lua_rawgetp COMPAT53_CONCAT(COMPAT53_PREFIX, _rawgetp)
COMPAT53_API int lua_rawgetp (lua_State *L, int i, const void *p);
#define lua_rawsetp COMPAT53_CONCAT(COMPAT53_PREFIX, _rawsetp)
COMPAT53_API void lua_rawsetp(lua_State *L, int i, const void *p);
#define lua_rawlen(L, i) lua_objlen((L), (i))
#define lua_tointeger(L, i) lua_tointegerx((L), (i), NULL)
#define lua_tonumberx COMPAT53_CONCAT(COMPAT53_PREFIX, _tonumberx)
COMPAT53_API lua_Number lua_tonumberx (lua_State *L, int i, int *isnum);
#define luaL_checkversion COMPAT53_CONCAT(COMPAT53_PREFIX, L_checkversion)
COMPAT53_API void luaL_checkversion (lua_State *L);
#define lua_load COMPAT53_CONCAT(COMPAT53_PREFIX, _load_53)
COMPAT53_API int lua_load (lua_State *L, lua_Reader reader, void *data, const char* source, const char* mode);
#define luaL_loadfilex COMPAT53_CONCAT(COMPAT53_PREFIX, L_loadfilex)
COMPAT53_API int luaL_loadfilex (lua_State *L, const char *filename, const char *mode);
#define luaL_loadbufferx COMPAT53_CONCAT(COMPAT53_PREFIX, L_loadbufferx)
COMPAT53_API int luaL_loadbufferx (lua_State *L, const char *buff, size_t sz, const char *name, const char *mode);
#define luaL_checkstack COMPAT53_CONCAT(COMPAT53_PREFIX, L_checkstack_53)
COMPAT53_API void luaL_checkstack (lua_State *L, int sp, const char *msg);
#define luaL_getsubtable COMPAT53_CONCAT(COMPAT53_PREFIX, L_getsubtable)
COMPAT53_API int luaL_getsubtable (lua_State* L, int i, const char *name);
#define luaL_len COMPAT53_CONCAT(COMPAT53_PREFIX, L_len)
COMPAT53_API lua_Integer luaL_len (lua_State *L, int i);
#define luaL_setfuncs COMPAT53_CONCAT(COMPAT53_PREFIX, L_setfuncs)
COMPAT53_API void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup);
#define luaL_setmetatable COMPAT53_CONCAT(COMPAT53_PREFIX, L_setmetatable)
COMPAT53_API void luaL_setmetatable (lua_State *L, const char *tname);
#define luaL_testudata COMPAT53_CONCAT(COMPAT53_PREFIX, L_testudata)
COMPAT53_API void *luaL_testudata (lua_State *L, int i, const char *tname);
#define luaL_traceback COMPAT53_CONCAT(COMPAT53_PREFIX, L_traceback)
COMPAT53_API void luaL_traceback (lua_State *L, lua_State *L1, const char *msg, int level);
#define luaL_fileresult COMPAT53_CONCAT(COMPAT53_PREFIX, L_fileresult)
COMPAT53_API int luaL_fileresult (lua_State *L, int stat, const char *fname);
#define luaL_execresult COMPAT53_CONCAT(COMPAT53_PREFIX, L_execresult)
COMPAT53_API int luaL_execresult (lua_State *L, int stat);
#define lua_callk(L, na, nr, ctx, cont) \
((void)(ctx), (void)(cont), lua_call((L), (na), (nr)))
#define lua_pcallk(L, na, nr, err, ctx, cont) \
((void)(ctx), (void)(cont), lua_pcall((L), (na), (nr), (err)))
#define lua_resume(L, from, nargs) \
((void)(from), lua_resume((L), (nargs)))
#define luaL_buffinit COMPAT53_CONCAT(COMPAT53_PREFIX, _buffinit_53)
COMPAT53_API void luaL_buffinit (lua_State *L, luaL_Buffer_53 *B);
#define luaL_prepbuffsize COMPAT53_CONCAT(COMPAT53_PREFIX, _prepbufsize_53)
COMPAT53_API char *luaL_prepbuffsize (luaL_Buffer_53 *B, size_t s);
#define luaL_addlstring COMPAT53_CONCAT(COMPAT53_PREFIX, _addlstring_53)
COMPAT53_API void luaL_addlstring (luaL_Buffer_53 *B, const char *s, size_t l);
#define luaL_addvalue COMPAT53_CONCAT(COMPAT53_PREFIX, _addvalue_53)
COMPAT53_API void luaL_addvalue (luaL_Buffer_53 *B);
#define luaL_pushresult COMPAT53_CONCAT(COMPAT53_PREFIX, _pushresult_53)
COMPAT53_API void luaL_pushresult (luaL_Buffer_53 *B);
#undef luaL_buffinitsize
#define luaL_buffinitsize(L, B, s) \
(luaL_buffinit((L), (B)), luaL_prepbuffsize((B), (s)))
#undef luaL_prepbuffer
#define luaL_prepbuffer(B) \
luaL_prepbuffsize((B), LUAL_BUFFERSIZE)
#undef luaL_addchar
#define luaL_addchar(B, c) \
((void)((B)->nelems < (B)->capacity || luaL_prepbuffsize((B), 1)), \
((B)->ptr[(B)->nelems++] = (c)))
#undef luaL_addsize
#define luaL_addsize(B, s) \
((B)->nelems += (s))
#undef luaL_addstring
#define luaL_addstring(B, s) \
luaL_addlstring((B), (s), strlen((s)))
#undef luaL_pushresultsize
#define luaL_pushresultsize(B, s) \
(luaL_addsize((B), (s)), luaL_pushresult((B)))
#if defined(LUA_COMPAT_APIINTCASTS)
#define lua_pushunsigned(L, n) \
lua_pushinteger((L), (lua_Integer)(n))
#define lua_tounsignedx(L, i, is) \
((lua_Unsigned)lua_tointegerx((L), (i), (is)))
#define lua_tounsigned(L, i) \
lua_tounsignedx((L), (i), NULL)
#define luaL_checkunsigned(L, a) \
((lua_Unsigned)luaL_checkinteger((L), (a)))
#define luaL_optunsigned(L, a, d) \
((lua_Unsigned)luaL_optinteger((L), (a), (lua_Integer)(d)))
#endif
#endif /* Lua 5.1 only */
/* declarations for Lua 5.1 and 5.2 */
#if defined(LUA_VERSION_NUM) && LUA_VERSION_NUM <= 502
typedef int lua_KContext;
typedef int (*lua_KFunction)(lua_State *L, int status, lua_KContext ctx);
#define lua_dump(L, w, d, s) \
((void)(s), lua_dump((L), (w), (d)))
#define lua_getfield(L, i, k) \
(lua_getfield((L), (i), (k)), lua_type((L), -1))
#define lua_gettable(L, i) \
(lua_gettable((L), (i)), lua_type((L), -1))
#define lua_geti COMPAT53_CONCAT(COMPAT53_PREFIX, _geti)
COMPAT53_API int lua_geti (lua_State *L, int index, lua_Integer i);
#define lua_getextraspace COMPAT53_CONCAT(COMPAT53_PREFIX, _getextraspace)
COMPAT53_API void *lua_getextraspace (lua_State *L);
#define lua_isinteger COMPAT53_CONCAT(COMPAT53_PREFIX, _isinteger)
COMPAT53_API int lua_isinteger (lua_State *L, int index);
#define lua_tointegerx COMPAT53_CONCAT(COMPAT53_PREFIX, _tointegerx_53)
COMPAT53_API lua_Integer lua_tointegerx (lua_State *L, int i, int *isnum);
#define lua_numbertointeger(n, p) \
((*(p) = (lua_Integer)(n)), 1)
#define lua_rawget(L, i) \
(lua_rawget((L), (i)), lua_type((L), -1))
#define lua_rawgeti(L, i, n) \
(lua_rawgeti((L), (i), (n)), lua_type((L), -1))
#define lua_rotate COMPAT53_CONCAT(COMPAT53_PREFIX, _rotate)
COMPAT53_API void lua_rotate (lua_State *L, int idx, int n);
#define lua_seti COMPAT53_CONCAT(COMPAT53_PREFIX, _seti)
COMPAT53_API void lua_seti (lua_State *L, int index, lua_Integer i);
#define lua_stringtonumber COMPAT53_CONCAT(COMPAT53_PREFIX, _stringtonumber)
COMPAT53_API size_t lua_stringtonumber (lua_State *L, const char *s);
#define luaL_tolstring COMPAT53_CONCAT(COMPAT53_PREFIX, L_tolstring)
COMPAT53_API const char *luaL_tolstring (lua_State *L, int idx, size_t *len);
#define luaL_getmetafield(L, o, e) \
(luaL_getmetafield((L), (o), (e)) ? lua_type((L), -1) : LUA_TNIL)
#define luaL_newmetatable(L, tn) \
(luaL_newmetatable((L), (tn)) ? (lua_pushstring((L), (tn)), lua_setfield((L), -2, "__name"), 1) : 0)
#define luaL_requiref COMPAT53_CONCAT(COMPAT53_PREFIX, L_requiref_53)
COMPAT53_API void luaL_requiref (lua_State *L, const char *modname,
lua_CFunction openf, int glb );
#endif /* Lua 5.1 and Lua 5.2 */
/* declarations for Lua 5.2 */
#if defined(LUA_VERSION_NUM) && LUA_VERSION_NUM == 502
/* XXX not implemented:
* lua_isyieldable
* lua_arith (new operators)
* lua_pushfstring (new formats)
*/
#define lua_getglobal(L, n) \
(lua_getglobal((L), (n)), lua_type((L), -1))
#define lua_getuservalue(L, i) \
(lua_getuservalue((L), (i)), lua_type((L), -1))
#define lua_pushlstring(L, s, len) \
(((len) == 0) ? lua_pushlstring((L), "", 0) : lua_pushlstring((L), (s), (len)))
#define lua_rawgetp(L, i, p) \
(lua_rawgetp((L), (i), (p)), lua_type((L), -1))
#define LUA_KFUNCTION(_name) \
static int (_name)(lua_State *L, int status, lua_KContext ctx); \
static int (_name ## _52)(lua_State *L) { \
lua_KContext ctx; \
int status = lua_getctx(L, &ctx); \
return (_name)(L, status, ctx); \
} \
static int (_name)(lua_State *L, int status, lua_KContext ctx)
#define lua_pcallk(L, na, nr, err, ctx, cont) \
lua_pcallk((L), (na), (nr), (err), (ctx), cont ## _52)
#define lua_callk(L, na, nr, ctx, cont) \
lua_callk((L), (na), (nr), (ctx), cont ## _52)
#define lua_yieldk(L, nr, ctx, cont) \
lua_yieldk((L), (nr), (ctx), cont ## _52)
#ifdef lua_call
# undef lua_call
# define lua_call(L, na, nr) \
(lua_callk)((L), (na), (nr), 0, NULL)
#endif
#ifdef lua_pcall
# undef lua_pcall
# define lua_pcall(L, na, nr, err) \
(lua_pcallk)((L), (na), (nr), (err), 0, NULL)
#endif
#ifdef lua_yield
# undef lua_yield
# define lua_yield(L, nr) \
(lua_yieldk)((L), (nr), 0, NULL)
#endif
#endif /* Lua 5.2 only */
/* other Lua versions */
#if !defined(LUA_VERSION_NUM) || LUA_VERSION_NUM < 501 || LUA_VERSION_NUM > 504
# error "unsupported Lua version (i.e. not Lua 5.1, 5.2, 5.3, or 5.4)"
#endif /* other Lua versions except 5.1, 5.2, 5.3, and 5.4 */
/* helper macro for defining continuation functions (for every version
* *except* Lua 5.2) */
#ifndef LUA_KFUNCTION
#define LUA_KFUNCTION(_name) \
static int (_name)(lua_State *L, int status, lua_KContext ctx)
#endif
#if defined(COMPAT53_INCLUDE_SOURCE)
# include "compat-5.3.c"
#endif
#endif /* COMPAT53_H_ */

515
src/ffi/shim/shim.c
View File

@ -1,515 +0,0 @@
// The MIT License (MIT)
//
// Copyright (c) 2019-2021 A. Orlenko
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include <lauxlib.h>
#include <lua.h>
#include "compat-5.3.h"
size_t MLUA_WRAPPED_ERROR_SIZE = 0;
size_t MLUA_WRAPPED_PANIC_SIZE = 0;
const void *MLUA_WRAPPED_ERROR_KEY = NULL;
const void *MLUA_WRAPPED_PANIC_KEY = NULL;
extern void wrapped_error_traceback(lua_State *L, int error_idx,
int traceback_idx);
extern int mlua_hook_proc(lua_State *L, lua_Debug *ar);
#define max(a, b) (a > b ? a : b)
// I believe luaL_traceback < 5.4 requires this much free stack to not error.
// 5.4 uses luaL_Buffer
const int LUA_TRACEBACK_STACK = 11;
typedef struct {
const char *data;
size_t len;
} StringArg;
static void handle_wrapped_error(lua_State *L) {
if (lua_checkstack(L, LUA_TRACEBACK_STACK) != 0) {
luaL_traceback(L, L, NULL, 0);
// Convert to CallbackError and attach traceback
wrapped_error_traceback(L, -2, -1);
lua_pop(L, 1);
} else {
// Convert to CallbackError with error message as a traceback
wrapped_error_traceback(L, -1, 0);
}
}
// A wrapper around Rust function to protect from triggering longjmp in Rust.
// Rust callback expected to return positive number of output values or
// -1 in case of error, -2 in case of panic.
static int lua_call_rust(lua_State *L) {
int nargs = lua_gettop(L);
// We need one extra stack space to store preallocated memory, and at least 2
// stack spaces overall for handling error metatables in rust fn
int extra_stack = 1;
if (nargs < 2) {
extra_stack = 2 - nargs;
}
luaL_checkstack(L, extra_stack,
"not enough stack space for callback error handling");
// We cannot shadow rust errors with Lua ones, we pre-allocate enough memory
// to store a wrapped error or panic *before* we proceed.
lua_newuserdata(L, max(MLUA_WRAPPED_ERROR_SIZE, MLUA_WRAPPED_PANIC_SIZE));
lua_rotate(L, 1, 1);
lua_CFunction rust_callback = lua_touserdata(L, lua_upvalueindex(1));
int ret = rust_callback(L);
if (ret < 0) {
if (ret == -1 /* WrappedError */) {
handle_wrapped_error(L);
}
lua_error(L);
}
return ret;
}
void lua_call_mlua_hook_proc(lua_State *L, lua_Debug *ar) {
luaL_checkstack(L, 2, "not enough stack space for callback error handling");
lua_newuserdata(L, max(MLUA_WRAPPED_ERROR_SIZE, MLUA_WRAPPED_PANIC_SIZE));
lua_rotate(L, 1, 1);
int ret = mlua_hook_proc(L, ar);
if (ret < 0) {
if (ret == -1 /* WrappedError */) {
handle_wrapped_error(L);
}
lua_error(L);
}
}
static inline lua_Integer lua_popinteger(lua_State *L) {
lua_Integer index = lua_tointeger(L, -1);
lua_pop(L, 1);
return index;
}
//
// Common functions
//
int lua_gc_s(lua_State *L) {
int data = lua_popinteger(L);
int what = lua_popinteger(L);
int ret = lua_gc(L, what, data);
lua_pushinteger(L, ret);
return 1;
}
int luaL_ref_s(lua_State *L) {
int ret = luaL_ref(L, -2);
lua_pushinteger(L, ret);
return 1;
}
int lua_pushlstring_s(lua_State *L) {
StringArg *s = lua_touserdata(L, -1);
lua_pop(L, 1);
lua_pushlstring(L, s->data, s->len);
return 1;
}
int lua_tolstring_s(lua_State *L) {
void *len = lua_touserdata(L, -1);
lua_pop(L, 1);
const char *s = lua_tolstring(L, -1, len);
lua_pushlightuserdata(L, (void *)s);
return 2;
}
int lua_newthread_s(lua_State *L) {
lua_newthread(L);
return 1;
}
int lua_newuserdata_s(lua_State *L) {
size_t size = lua_tointeger(L, -1);
lua_pop(L, 1);
lua_newuserdata(L, size);
return 1;
}
int lua_newwrappederror_s(lua_State *L) {
lua_newuserdata(L, MLUA_WRAPPED_ERROR_SIZE);
return 1;
}
int lua_pushcclosure_s(lua_State *L) {
int n = lua_gettop(L) - 1;
lua_CFunction fn = lua_touserdata(L, -1);
lua_pop(L, 1);
lua_pushcclosure(L, fn, n);
return 1;
}
int lua_pushrclosure_s(lua_State *L) {
int n = lua_gettop(L);
lua_pushcclosure(L, lua_call_rust, n);
return 1;
}
int luaL_requiref_s(lua_State *L) {
const char *modname = lua_touserdata(L, -3);
lua_CFunction openf = lua_touserdata(L, -2);
int glb = lua_tointeger(L, -1);
lua_pop(L, 3);
luaL_requiref(L, modname, openf, glb);
return 1;
}
//
// Table functions
//
int lua_newtable_s(lua_State *L) {
lua_createtable(L, 0, 0);
return 1;
}
int lua_createtable_s(lua_State *L) {
int nrec = lua_popinteger(L);
int narr = lua_popinteger(L);
lua_createtable(L, narr, nrec);
return 1;
}
int lua_gettable_s(lua_State *L) {
lua_gettable(L, -2);
return 1;
}
int lua_settable_s(lua_State *L) {
lua_settable(L, -3);
return 0;
}
int lua_geti_s(lua_State *L) {
lua_Integer index = lua_popinteger(L);
lua_geti(L, -1, index);
return 1;
}
int lua_rawset_s(lua_State *L) {
lua_rawset(L, -3);
return 0;
}
int lua_rawseti_s(lua_State *L) {
lua_Integer index = lua_popinteger(L);
lua_rawseti(L, -2, index);
return 0;
}
int lua_rawsetp_s(lua_State *L) {
void *p = lua_touserdata(L, -1);
lua_pop(L, 1);
lua_rawsetp(L, -2, p);
return 0;
}
int lua_rawsetfield_s(lua_State *L) {
StringArg *s = lua_touserdata(L, -2);
lua_pushlstring(L, s->data, s->len);
lua_replace(L, -3);
lua_rawset(L, -3);
return 0;
}
int lua_rawinsert_s(lua_State *L) {
lua_Integer index = lua_popinteger(L);
lua_Integer size = lua_rawlen(L, -2);
for (lua_Integer i = size; i >= index; i--) {
// table[i+1] = table[i]
lua_rawgeti(L, -2, i);
lua_rawseti(L, -3, i + 1);
}
lua_rawseti(L, -2, index);
return 0;
}
int lua_rawremove_s(lua_State *L) {
lua_Integer index = lua_popinteger(L);
lua_Integer size = lua_rawlen(L, -1);
for (lua_Integer i = index; i < size; i++) {
lua_rawgeti(L, -1, i + 1);
lua_rawseti(L, -2, i);
}
lua_pushnil(L);
lua_rawseti(L, -2, size);
return 0;
}
int luaL_len_s(lua_State *L) {
lua_pushinteger(L, luaL_len(L, -1));
return 1;
}
int lua_next_s(lua_State *L) {
int ret = lua_next(L, -2);
lua_pushinteger(L, ret);
return ret == 0 ? 1 : 3;
}
//
// Moved from Rust to C
//
// Wrapper to lookup in `field_getters` first, then `methods`, ending
// original `__index`. Used only if `field_getters` or `methods` set.
int meta_index_impl(lua_State *state) {
// stack: self, key
luaL_checkstack(state, 2, NULL);
// lookup in `field_getters` table
if (lua_isnil(state, lua_upvalueindex(2)) == 0) {
lua_pushvalue(state, -1); // `key` arg
if (lua_rawget(state, lua_upvalueindex(2)) != LUA_TNIL) {
lua_insert(state, -3); // move function
lua_pop(state, 1); // remove `key`
lua_call(state, 1, 1);
return 1;
}
lua_pop(state, 1); // pop the nil value
}
// lookup in `methods` table
if (lua_isnil(state, lua_upvalueindex(3)) == 0) {
lua_pushvalue(state, -1); // `key` arg
if (lua_rawget(state, lua_upvalueindex(3)) != LUA_TNIL) {
lua_insert(state, -3);
lua_pop(state, 2);
return 1;
}
lua_pop(state, 1); // pop the nil value
}
// lookup in `__index`
lua_pushvalue(state, lua_upvalueindex(1));
switch (lua_type(state, -1)) {
case LUA_TNIL:
lua_pop(state, 1); // pop the nil value
const char *field = lua_tostring(state, -1);
luaL_error(state, "attempt to get an unknown field '%s'", field);
break;
case LUA_TTABLE:
lua_insert(state, -2);
lua_gettable(state, -2);
break;
case LUA_TFUNCTION:
lua_insert(state, -3);
lua_call(state, 2, 1);
break;
}
return 1;
}
// Similar to `meta_index_impl`, checks `field_setters` table first, then
// `__newindex` metamethod. Used only if `field_setters` set.
int meta_newindex_impl(lua_State *state) {
// stack: self, key, value
luaL_checkstack(state, 2, NULL);
// lookup in `field_setters` table
lua_pushvalue(state, -2); // `key` arg
if (lua_rawget(state, lua_upvalueindex(2)) != LUA_TNIL) {
lua_remove(state, -3); // remove `key`
lua_insert(state, -3); // move function
lua_call(state, 2, 0);
return 0;
}
lua_pop(state, 1); // pop the nil value
// lookup in `__newindex`
lua_pushvalue(state, lua_upvalueindex(1));
switch (lua_type(state, -1)) {
case LUA_TNIL:
lua_pop(state, 1); // pop the nil value
const char *field = lua_tostring(state, -2);
luaL_error(state, "attempt to set an unknown field '%s'", field);
break;
case LUA_TTABLE:
lua_insert(state, -3);
lua_settable(state, -3);
break;
case LUA_TFUNCTION:
lua_insert(state, -4);
lua_call(state, 3, 0);
break;
}
return 0;
}
// See Function::bind
int bind_call_impl(lua_State *state) {
int nargs = lua_gettop(state);
int nbinds = lua_tointeger(state, lua_upvalueindex(2));
luaL_checkstack(state, nbinds + 2, NULL);
lua_settop(state, nargs + nbinds + 1);
lua_rotate(state, -(nargs + nbinds + 1), nbinds + 1);
lua_pushvalue(state, lua_upvalueindex(1));
lua_replace(state, 1);
for (int i = 0; i < nbinds; i++) {
lua_pushvalue(state, lua_upvalueindex(i + 3));
lua_replace(state, i + 2);
}
lua_call(state, nargs + nbinds, LUA_MULTRET);
return lua_gettop(state);
}
// Returns 1 if a value at index `index` is a special wrapped struct identified
// by `key`
int is_wrapped_struct(lua_State *state, int index, const void *key) {
if (key == NULL) {
// Not yet initialized?
return 0;
}
void *ud = lua_touserdata(state, index);
if (ud == NULL || lua_getmetatable(state, index) == 0) {
return 0;
}
lua_rawgetp(state, LUA_REGISTRYINDEX, key);
int res = lua_rawequal(state, -1, -2);
lua_pop(state, 2);
return res;
}
// Takes an error at the top of the stack and converts Lua errors into a string
// with attached traceback. If the error is a WrappedError or WrappedPanic, does
// not modify it. This function does its best to avoid triggering another error
// and shadowing previous rust errors.
int error_traceback(lua_State *state) {
if (lua_checkstack(state, 2) == 0) {
// If we don't have enough stack space to even check the error type, do
// nothing so we don't risk shadowing a rust panic.
return 1;
}
if (MLUA_WRAPPED_PANIC_KEY == NULL ||
is_wrapped_struct(state, -1, MLUA_WRAPPED_PANIC_KEY) ||
is_wrapped_struct(state, -1, MLUA_WRAPPED_ERROR_KEY)) {
return 1;
}
const char *s = luaL_tolstring(state, -1, NULL);
if (lua_checkstack(state, LUA_TRACEBACK_STACK) != 0) {
luaL_traceback(state, state, s, 1);
lua_remove(state, -2);
}
return 1;
}
int error_traceback_s(lua_State *L) {
lua_State *L1 = lua_touserdata(L, -1);
lua_pop(L, 1);
return error_traceback(L1);
}
// A `pcall` implementation that does not allow Lua to catch Rust panics.
// Instead, panics automatically resumed.
int lua_nopanic_pcall(lua_State *state) {
luaL_checkstack(state, 2, NULL);
int top = lua_gettop(state);
if (top == 0) {
lua_pushstring(state, "not enough arguments to pcall");
lua_error(state);
}
if (lua_pcall(state, top - 1, LUA_MULTRET, 0) == LUA_OK) {
lua_pushboolean(state, 1);
lua_insert(state, 1);
return lua_gettop(state);
}
if (is_wrapped_struct(state, -1, MLUA_WRAPPED_PANIC_KEY)) {
lua_error(state);
}
lua_pushboolean(state, 0);
lua_insert(state, -2);
return 2;
}
// A `xpcall` implementation that does not allow Lua to catch Rust panics.
// Instead, panics automatically resumed.
static int xpcall_msgh(lua_State *state) {
luaL_checkstack(state, 2, NULL);
if (is_wrapped_struct(state, -1, MLUA_WRAPPED_PANIC_KEY)) {
return 1;
}
lua_pushvalue(state, lua_upvalueindex(1));
lua_insert(state, 1);
lua_call(state, lua_gettop(state) - 1, LUA_MULTRET);
return lua_gettop(state);
}
int lua_nopanic_xpcall(lua_State *state) {
luaL_checkstack(state, 2, NULL);
int top = lua_gettop(state);
if (top < 2) {
lua_pushstring(state, "not enough arguments to xpcall");
lua_error(state);
}
lua_pushvalue(state, 2);
lua_pushcclosure(state, xpcall_msgh, 1);
lua_copy(state, 1, 2);
lua_replace(state, 1);
if (lua_pcall(state, lua_gettop(state) - 2, LUA_MULTRET, 1) == LUA_OK) {
lua_pushboolean(state, 1);
lua_insert(state, 2);
return lua_gettop(state) - 1;
}
if (is_wrapped_struct(state, -1, MLUA_WRAPPED_PANIC_KEY)) {
lua_error(state);
}
lua_pushboolean(state, 0);
lua_insert(state, -2);
return 2;
}

29
src/function.rs
View File

@ -1,10 +1,11 @@
use std::os::raw::{c_int, c_void};
use std::ptr;
use std::slice;
use crate::error::{Error, Result};
use crate::ffi;
use crate::types::LuaRef;
use crate::util::{assert_stack, check_stack, pop_error, StackGuard};
use crate::util::{assert_stack, check_stack, error_traceback, pop_error, protect_lua, StackGuard};
use crate::value::{FromLuaMulti, MultiValue, ToLuaMulti};
#[cfg(feature = "async")]
@ -65,7 +66,7 @@ impl<'lua> Function<'lua> {
let _sg = StackGuard::new(lua.state);
check_stack(lua.state, nargs + 3)?;
ffi::lua_pushcfunction(lua.state, ffi::safe::error_traceback);
ffi::lua_pushcfunction(lua.state, error_traceback);
let stack_start = ffi::lua_gettop(lua.state);
lua.push_ref(&self.0);
for arg in args {
@ -159,6 +160,26 @@ impl<'lua> Function<'lua> {
/// # }
/// ```
pub fn bind<A: ToLuaMulti<'lua>>(&self, args: A) -> Result<Function<'lua>> {
unsafe extern "C" fn bind_call_impl(state: *mut ffi::lua_State) -> c_int {
let nargs = ffi::lua_gettop(state);
let nbinds = ffi::lua_tointeger(state, ffi::lua_upvalueindex(2)) as c_int;
ffi::luaL_checkstack(state, nbinds + 2, ptr::null());
ffi::lua_settop(state, nargs + nbinds + 1);
ffi::lua_rotate(state, -(nargs + nbinds + 1), nbinds + 1);
ffi::lua_pushvalue(state, ffi::lua_upvalueindex(1));
ffi::lua_replace(state, 1);
for i in 0..nbinds {
ffi::lua_pushvalue(state, ffi::lua_upvalueindex(i + 3));
ffi::lua_replace(state, i + 2);
}
ffi::lua_call(state, nargs + nbinds, ffi::LUA_MULTRET);
ffi::lua_gettop(state)
}
let lua = self.0.lua;
let args = args.to_lua_multi(lua)?;
@ -177,7 +198,9 @@ impl<'lua> Function<'lua> {
for arg in args {
lua.push_value(arg)?;
}
ffi::safe::lua_pushcclosure(lua.state, ffi::safe::bind_call_impl, nargs + 2)?;
protect_lua(lua.state, nargs + 2, 1, |state| {
ffi::lua_pushcclosure(state, bind_call_impl, nargs + 2);
})?;
Ok(Function(lua.pop_ref()))
}

5
src/hook.rs
View File

@ -165,8 +165,7 @@ impl HookTriggers {
}
}
#[no_mangle]
pub unsafe extern "C" fn mlua_hook_proc(state: *mut lua_State, ar: *mut lua_Debug) -> c_int {
pub(crate) unsafe extern "C" fn hook_proc(state: *mut lua_State, ar: *mut lua_Debug) {
callback_error(state, |_| {
let debug = Debug {
ar,
@ -183,7 +182,7 @@ pub unsafe extern "C" fn mlua_hook_proc(state: *mut lua_State, ar: *mut lua_Debu
Err(_) => mlua_panic!("Lua should not allow hooks to be called within another hook"),
}?;
Ok(0)
Ok(())
})
}

227
src/lua.rs
View File

@ -12,7 +12,7 @@ use std::{mem, ptr, str};
use crate::error::{Error, Result};
use crate::ffi;
use crate::function::Function;
use crate::hook::{Debug, HookTriggers};
use crate::hook::{hook_proc, Debug, HookTriggers};
use crate::scope::Scope;
use crate::stdlib::StdLib;
use crate::string::String;
@ -27,8 +27,9 @@ use crate::userdata::{
use crate::util::{
assert_stack, callback_error, check_stack, get_destructed_userdata_metatable, get_gc_userdata,
get_main_state, get_userdata, get_wrapped_error, init_error_registry, init_gc_metatable_for,
init_userdata_metatable, pop_error, push_gc_userdata, push_userdata, push_wrapped_error,
StackGuard, WrappedError, WrappedPanic,
init_userdata_metatable, pop_error, protect_lua, push_gc_userdata, push_string, push_table,
push_userdata, push_wrapped_error, rawset_field, safe_pcall, safe_xpcall, StackGuard,
WrappedPanic,
};
use crate::value::{FromLua, FromLuaMulti, MultiValue, Nil, ToLua, ToLuaMulti, Value};
@ -326,10 +327,7 @@ impl Lua {
#[cfg(any(feature = "lua51", feature = "luajit"))]
let state = ffi::luaL_newstate();
mlua_expect!(
ffi::safe::luaL_requiref(state, "_G", ffi::luaopen_base, 1),
"Error during loading base lib"
);
ffi::luaL_requiref(state, cstr!("_G"), ffi::luaopen_base, 1);
ffi::lua_pop(state, 1);
let mut lua = Lua::init_from_ptr(state);
@ -355,11 +353,11 @@ impl Lua {
#[cfg(any(feature = "lua51", feature = "luajit"))]
ffi::lua_pushvalue(lua.state, ffi::LUA_GLOBALSINDEX);
ffi::lua_pushcfunction(lua.state, ffi::safe::lua_nopanic_pcall);
ffi::safe::lua_rawsetfield(lua.state, -2, "pcall")?;
ffi::lua_pushcfunction(lua.state, safe_pcall);
rawset_field(lua.state, -2, "pcall")?;
ffi::lua_pushcfunction(lua.state, ffi::safe::lua_nopanic_xpcall);
ffi::safe::lua_rawsetfield(lua.state, -2, "xpcall")?;
ffi::lua_pushcfunction(lua.state, safe_xpcall);
rawset_field(lua.state, -2, "xpcall")?;
Ok(())
})(),
@ -383,15 +381,7 @@ impl Lua {
let ref_thread = mlua_expect!(
(|state| {
// Before initializing the error registry, we must set Error/Panic size.
// Error/Panic keys are not needed during the registry initialization.
ffi::safe::WRAPPED_ERROR_SIZE = mem::size_of::<WrappedError>();
ffi::safe::WRAPPED_PANIC_SIZE = mem::size_of::<WrappedPanic>();
let (wrapped_error_key, wrapped_panic_key) = init_error_registry(state)?;
ffi::safe::WRAPPED_ERROR_KEY = wrapped_error_key as *const c_void;
ffi::safe::WRAPPED_PANIC_KEY = wrapped_panic_key as *const c_void;
init_error_registry(state)?;
// Create the internal metatables and place them in the registry
// to prevent them from being garbage collected.
@ -408,7 +398,9 @@ impl Lua {
// Create empty Waker slot
push_gc_userdata::<Option<Waker>>(state, None)?;
let waker_key = &WAKER_REGISTRY_KEY as *const u8 as *const c_void;
ffi::safe::lua_rawsetp(state, ffi::LUA_REGISTRYINDEX, waker_key)?;
protect_lua(state, 1, 0, |state| {
ffi::lua_rawsetp(state, ffi::LUA_REGISTRYINDEX, waker_key);
})?;
}
// Init serde metatables
@ -417,9 +409,11 @@ impl Lua {
// Create ref stack thread and place it in the registry to prevent it from being garbage
// collected.
let ref_thread = ffi::safe::lua_newthread(state)?;
ffi::safe::luaL_ref(state, ffi::LUA_REGISTRYINDEX)?;
let ref_thread = protect_lua(state, 0, 0, |state| {
let thread = ffi::lua_newthread(state);
ffi::luaL_ref(state, ffi::LUA_REGISTRYINDEX);
thread
})?;
Ok::<_, Error>(ref_thread)
})(main_state),
@ -449,7 +443,9 @@ impl Lua {
);
let extra_key = &EXTRA_REGISTRY_KEY as *const u8 as *const c_void;
mlua_expect!(
ffi::safe::lua_rawsetp(main_state, ffi::LUA_REGISTRYINDEX, extra_key),
protect_lua(main_state, 1, 0, |state| {
ffi::lua_rawsetp(state, ffi::LUA_REGISTRYINDEX, extra_key)
}),
"Error while storing extra data",
);
@ -594,12 +590,7 @@ impl Lua {
unsafe {
let mut extra = mlua_expect!(self.extra.lock(), "extra is poisoned");
extra.hook_callback = Some(Arc::new(RefCell::new(callback)));
ffi::lua_sethook(
state,
Some(ffi::safe::lua_call_mlua_hook_proc),
triggers.mask(),
triggers.count(),
);
ffi::lua_sethook(state, Some(hook_proc), triggers.mask(), triggers.count());
}
Ok(())
}
@ -683,7 +674,12 @@ impl Lua {
/// objects. Once to finish the current gc cycle, and once to start and finish the next cycle.
pub fn gc_collect(&self) -> Result<()> {
let state = self.main_state.unwrap_or(self.state);
unsafe { ffi::safe::lua_gc(state, ffi::LUA_GCCOLLECT, 0).map(|_| ()) }
unsafe {
check_stack(state, 3)?;
protect_lua(state, 0, 0, |state| {
ffi::lua_gc(state, ffi::LUA_GCCOLLECT, 0);
})
}
}
/// Steps the garbage collector one indivisible step.
@ -699,7 +695,12 @@ impl Lua {
/// finished a collection cycle.
pub fn gc_step_kbytes(&self, kbytes: c_int) -> Result<bool> {
let state = self.main_state.unwrap_or(self.state);
unsafe { Ok(ffi::safe::lua_gc(state, ffi::LUA_GCSTEP, kbytes)? != 0) }
unsafe {
check_stack(state, 3)?;
protect_lua(state, 0, 0, |state| {
ffi::lua_gc(state, ffi::LUA_GCSTEP, kbytes) != 0
})
}
}
/// Sets the 'pause' value of the collector.
@ -863,7 +864,7 @@ impl Lua {
unsafe {
let _sg = StackGuard::new(self.state);
check_stack(self.state, 3)?;
ffi::safe::lua_pushstring(self.state, s)?;
push_string(self.state, s)?;
Ok(String(self.pop_ref()))
}
}
@ -872,8 +873,8 @@ impl Lua {
pub fn create_table(&self) -> Result<Table> {
unsafe {
let _sg = StackGuard::new(self.state);
check_stack(self.state, 2)?;
ffi::safe::lua_newtable(self.state)?;
check_stack(self.state, 3)?;
push_table(self.state, 0, 0)?;
Ok(Table(self.pop_ref()))
}
}
@ -885,8 +886,8 @@ impl Lua {
pub fn create_table_with_capacity(&self, narr: c_int, nrec: c_int) -> Result<Table> {
unsafe {
let _sg = StackGuard::new(self.state);
check_stack(self.state, 4)?;
ffi::safe::lua_createtable(self.state, narr, nrec)?;
check_stack(self.state, 3)?;
push_table(self.state, narr, nrec)?;
Ok(Table(self.pop_ref()))
}
}
@ -904,11 +905,11 @@ impl Lua {
let iter = iter.into_iter();
let lower_bound = iter.size_hint().0;
ffi::safe::lua_createtable(self.state, 0, lower_bound as c_int)?;
push_table(self.state, 0, lower_bound as c_int)?;
for (k, v) in iter {
self.push_value(k.to_lua(self)?)?;
self.push_value(v.to_lua(self)?)?;
ffi::safe::lua_rawset(self.state, -3)?;
protect_lua(self.state, 3, 1, |state| ffi::lua_rawset(state, -3))?;
}
Ok(Table(self.pop_ref()))
@ -923,14 +924,16 @@ impl Lua {
{
unsafe {
let _sg = StackGuard::new(self.state);
check_stack(self.state, 6)?;
check_stack(self.state, 5)?;
let iter = iter.into_iter();
let lower_bound = iter.size_hint().0;
ffi::safe::lua_createtable(self.state, lower_bound as c_int, 0)?;
push_table(self.state, lower_bound as c_int, 0)?;
for (i, v) in iter.enumerate() {
self.push_value(v.to_lua(self)?)?;
ffi::safe::lua_rawseti(self.state, -2, (i + 1) as Integer)?;
protect_lua(self.state, 2, 1, |state| {
ffi::lua_rawseti(state, -2, (i + 1) as Integer);
})?;
}
Ok(Table(self.pop_ref()))
@ -1086,9 +1089,9 @@ impl Lua {
pub fn create_thread<'lua>(&'lua self, func: Function<'lua>) -> Result<Thread<'lua>> {
unsafe {
let _sg = StackGuard::new(self.state);
check_stack(self.state, 2)?;
check_stack(self.state, 3)?;
let thread_state = ffi::safe::lua_newthread(self.state)?;
let thread_state = protect_lua(self.state, 0, 1, |state| ffi::lua_newthread(state))?;
self.push_ref(&func.0);
ffi::lua_xmove(self.state, thread_state, 1);
@ -1200,10 +1203,13 @@ impl Lua {
Value::String(s) => Some(s),
v => unsafe {
let _sg = StackGuard::new(self.state);
check_stack(self.state, 5)?;
check_stack(self.state, 4)?;
self.push_value(v)?;
if !ffi::safe::lua_tolstring(self.state, -1, ptr::null_mut())?.is_null() {
let res = protect_lua(self.state, 1, 1, |state| {
ffi::lua_tolstring(state, -1, ptr::null_mut())
})?;
if !res.is_null() {
Some(String(self.pop_ref()))
} else {
None
@ -1299,7 +1305,7 @@ impl Lua {
check_stack(self.state, 5)?;
self.push_value(t)?;
ffi::safe::lua_rawsetfield(self.state, ffi::LUA_REGISTRYINDEX, name)
rawset_field(self.state, ffi::LUA_REGISTRYINDEX, name)
}
}
@ -1318,7 +1324,7 @@ impl Lua {
let _sg = StackGuard::new(self.state);
check_stack(self.state, 3)?;
ffi::safe::lua_pushstring(self.state, name)?;
push_string(self.state, name)?;
ffi::lua_rawget(self.state, ffi::LUA_REGISTRYINDEX);
self.pop_value()
@ -1354,7 +1360,9 @@ impl Lua {
check_stack(self.state, 4)?;
self.push_value(t)?;
let registry_id = ffi::safe::luaL_ref(self.state, ffi::LUA_REGISTRYINDEX)?;
let registry_id = protect_lua(self.state, 1, 0, |state| {
ffi::luaL_ref(state, ffi::LUA_REGISTRYINDEX)
})?;
let extra = mlua_expect!(self.extra.lock(), "extra is poisoned");
@ -1618,20 +1626,21 @@ impl Lua {
// Prepare metatable, add meta methods first and then meta fields
let metatable_nrec = methods.meta_methods.len() + fields.meta_fields.len();
ffi::safe::lua_createtable(self.state, 0, metatable_nrec as c_int)?;
push_table(self.state, 0, metatable_nrec as c_int)?;
for (k, m) in methods.meta_methods {
self.push_value(Value::Function(self.create_callback(m)?))?;
ffi::safe::lua_rawsetfield(self.state, -2, k.validate()?.name())?;
rawset_field(self.state, -2, k.validate()?.name())?;
}
for (k, f) in fields.meta_fields {
self.push_value(f(self)?)?;
ffi::safe::lua_rawsetfield(self.state, -2, k.validate()?.name())?;
rawset_field(self.state, -2, k.validate()?.name())?;
}
// Add special `__mlua_type_id` field
let type_id_ptr =
ffi::safe::lua_newuserdata(self.state, mem::size_of::<TypeId>())? as *mut TypeId;
let type_id_ptr = protect_lua(self.state, 0, 1, |state| {
ffi::lua_newuserdata(state, mem::size_of::<TypeId>()) as *mut TypeId
})?;
ptr::write(type_id_ptr, type_id);
ffi::safe::lua_rawsetfield(self.state, -2, "__mlua_type_id")?;
rawset_field(self.state, -2, "__mlua_type_id")?;
let metatable_index = ffi::lua_absindex(self.state, -1);
let mut extra_tables_count = 0;
@ -1639,10 +1648,10 @@ impl Lua {
let mut field_getters_index = None;
let field_getters_nrec = fields.field_getters.len();
if field_getters_nrec > 0 {
ffi::safe::lua_createtable(self.state, 0, field_getters_nrec as c_int)?;
push_table(self.state, 0, field_getters_nrec as c_int)?;
for (k, m) in fields.field_getters {
self.push_value(Value::Function(self.create_callback(m)?))?;
ffi::safe::lua_rawsetfield(self.state, -2, &k)?;
rawset_field(self.state, -2, &k)?;
}
field_getters_index = Some(ffi::lua_absindex(self.state, -1));
extra_tables_count += 1;
@ -1651,10 +1660,10 @@ impl Lua {
let mut field_setters_index = None;
let field_setters_nrec = fields.field_setters.len();
if field_setters_nrec > 0 {
ffi::safe::lua_createtable(self.state, 0, field_setters_nrec as c_int)?;
push_table(self.state, 0, field_setters_nrec as c_int)?;
for (k, m) in fields.field_setters {
self.push_value(Value::Function(self.create_callback(m)?))?;
ffi::safe::lua_rawsetfield(self.state, -2, &k)?;
rawset_field(self.state, -2, &k)?;
}
field_setters_index = Some(ffi::lua_absindex(self.state, -1));
extra_tables_count += 1;
@ -1666,15 +1675,15 @@ impl Lua {
#[cfg(not(feature = "async"))]
let methods_nrec = methods.methods.len();
if methods_nrec > 0 {
ffi::safe::lua_createtable(self.state, 0, methods_nrec as c_int)?;
push_table(self.state, 0, methods_nrec as c_int)?;
for (k, m) in methods.methods {
self.push_value(Value::Function(self.create_callback(m)?))?;
ffi::safe::lua_rawsetfield(self.state, -2, &k)?;
rawset_field(self.state, -2, &k)?;
}
#[cfg(feature = "async")]
for (k, m) in methods.async_methods {
self.push_value(Value::Function(self.create_async_callback(m)?))?;
ffi::safe::lua_rawsetfield(self.state, -2, &k)?;
rawset_field(self.state, -2, &k)?;
}
methods_index = Some(ffi::lua_absindex(self.state, -1));
extra_tables_count += 1;
@ -1693,7 +1702,9 @@ impl Lua {
let ptr = ffi::lua_topointer(self.state, -1);
ffi::lua_pushvalue(self.state, -1);
let id = ffi::safe::luaL_ref(self.state, ffi::LUA_REGISTRYINDEX)?;
let id = protect_lua(self.state, 1, 0, |state| {
ffi::luaL_ref(state, ffi::LUA_REGISTRYINDEX)
})?;
let mut extra = mlua_expect!(self.extra.lock(), "extra is poisoned");
extra.registered_userdata.insert(type_id, id);
@ -1756,8 +1767,8 @@ impl Lua {
{
unsafe extern "C" fn call_callback(state: *mut ffi::lua_State) -> c_int {
callback_error(state, |nargs| {
let upvalue_idx1 = ffi::lua_upvalueindex(2);
let upvalue_idx2 = ffi::lua_upvalueindex(3);
let upvalue_idx1 = ffi::lua_upvalueindex(1);
let upvalue_idx2 = ffi::lua_upvalueindex(2);
if ffi::lua_type(state, upvalue_idx1) == ffi::LUA_TNIL
|| ffi::lua_type(state, upvalue_idx2) == ffi::LUA_TNIL
{
@ -1797,7 +1808,9 @@ impl Lua {
push_gc_userdata::<Callback>(self.state, mem::transmute(func))?;
push_gc_userdata(self.state, self.clone())?;
ffi::safe::lua_pushrclosure(self.state, call_callback, 2)?;
protect_lua(self.state, 2, 1, |state| {
ffi::lua_pushcclosure(state, call_callback, 2);
})?;
Ok(Function(self.pop_ref()))
}
@ -1821,8 +1834,8 @@ impl Lua {
unsafe extern "C" fn call_callback(state: *mut ffi::lua_State) -> c_int {
callback_error(state, |nargs| {
let upvalue_idx1 = ffi::lua_upvalueindex(2);
let upvalue_idx2 = ffi::lua_upvalueindex(3);
let upvalue_idx1 = ffi::lua_upvalueindex(1);
let upvalue_idx2 = ffi::lua_upvalueindex(2);
if ffi::lua_type(state, upvalue_idx1) == ffi::LUA_TNIL
|| ffi::lua_type(state, upvalue_idx2) == ffi::LUA_TNIL
{
@ -1848,7 +1861,9 @@ impl Lua {
push_gc_userdata(state, fut)?;
push_gc_userdata(state, lua.clone())?;
ffi::safe::lua_pushrclosure(state, poll_future, 2)?;
protect_lua(state, 2, 1, |state| {
ffi::lua_pushcclosure(state, poll_future, 2);
})?;
Ok(1)
})
@ -1856,8 +1871,8 @@ impl Lua {
unsafe extern "C" fn poll_future(state: *mut ffi::lua_State) -> c_int {
callback_error(state, |nargs| {
let upvalue_idx1 = ffi::lua_upvalueindex(2);
let upvalue_idx2 = ffi::lua_upvalueindex(3);
let upvalue_idx1 = ffi::lua_upvalueindex(1);
let upvalue_idx2 = ffi::lua_upvalueindex(2);
if ffi::lua_type(state, upvalue_idx1) == ffi::LUA_TNIL
|| ffi::lua_type(state, upvalue_idx2) == ffi::LUA_TNIL
{
@ -1910,7 +1925,9 @@ impl Lua {
push_gc_userdata::<AsyncCallback>(self.state, mem::transmute(func))?;
push_gc_userdata(self.state, self.clone())?;
ffi::safe::lua_pushrclosure(self.state, call_callback, 2)?;
protect_lua(self.state, 2, 1, |state| {
ffi::lua_pushcclosure(state, call_callback, 2);
})?;
Function(self.pop_ref())
};
@ -2257,43 +2274,76 @@ impl<'lua, T: AsRef<[u8]> + ?Sized> AsChunk<'lua> for T {
}
}
// Uses 3 stack spaces
unsafe fn load_from_std_lib(state: *mut ffi::lua_State, libs: StdLib) -> Result<()> {
#[inline(always)]
pub unsafe fn requiref<S: AsRef<[u8]> + ?Sized>(
state: *mut ffi::lua_State,
modname: &S,
openf: ffi::lua_CFunction,
glb: c_int,
) -> Result<()> {
let modname = mlua_expect!(CString::new(modname.as_ref()), "modname contains nil bytes");
protect_lua(state, 0, 1, |state| {
ffi::luaL_requiref(state, modname.as_ptr() as *const c_char, openf, glb)
})
}
#[cfg(feature = "luajit")]
struct GcGuard(*mut ffi::lua_State);
#[cfg(feature = "luajit")]
impl GcGuard {
fn new(state: *mut ffi::lua_State) -> Self {
// Stop collector during library initialization
unsafe { ffi::lua_gc(state, ffi::LUA_GCSTOP, 0) };
GcGuard(state)
}
}
#[cfg(feature = "luajit")]
impl Drop for GcGuard {
fn drop(&mut self) {
unsafe { ffi::lua_gc(self.0, ffi::LUA_GCRESTART, -1) };
}
}
// Stop collector during library initialization
ffi::lua_gc(state, ffi::LUA_GCSTOP, 0);
#[cfg(feature = "luajit")]
let _gc_guard = GcGuard::new(state);
#[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
{
if libs.contains(StdLib::COROUTINE) {
ffi::safe::luaL_requiref(state, ffi::LUA_COLIBNAME, ffi::luaopen_coroutine, 1)?;
requiref(state, ffi::LUA_COLIBNAME, ffi::luaopen_coroutine, 1)?;
ffi::lua_pop(state, 1);
}
}
if libs.contains(StdLib::TABLE) {
ffi::safe::luaL_requiref(state, ffi::LUA_TABLIBNAME, ffi::luaopen_table, 1)?;
requiref(state, ffi::LUA_TABLIBNAME, ffi::luaopen_table, 1)?;
ffi::lua_pop(state, 1);
}
if libs.contains(StdLib::IO) {
ffi::safe::luaL_requiref(state, ffi::LUA_IOLIBNAME, ffi::luaopen_io, 1)?;
requiref(state, ffi::LUA_IOLIBNAME, ffi::luaopen_io, 1)?;
ffi::lua_pop(state, 1);
}
if libs.contains(StdLib::OS) {
ffi::safe::luaL_requiref(state, ffi::LUA_OSLIBNAME, ffi::luaopen_os, 1)?;
requiref(state, ffi::LUA_OSLIBNAME, ffi::luaopen_os, 1)?;
ffi::lua_pop(state, 1);
}
if libs.contains(StdLib::STRING) {
ffi::safe::luaL_requiref(state, ffi::LUA_STRLIBNAME, ffi::luaopen_string, 1)?;
requiref(state, ffi::LUA_STRLIBNAME, ffi::luaopen_string, 1)?;
ffi::lua_pop(state, 1);
}
#[cfg(any(feature = "lua54", feature = "lua53"))]
{
if libs.contains(StdLib::UTF8) {
ffi::safe::luaL_requiref(state, ffi::LUA_UTF8LIBNAME, ffi::luaopen_utf8, 1)?;
requiref(state, ffi::LUA_UTF8LIBNAME, ffi::luaopen_utf8, 1)?;
ffi::lua_pop(state, 1);
}
}
@ -2301,7 +2351,7 @@ unsafe fn load_from_std_lib(state: *mut ffi::lua_State, libs: StdLib) -> Result<
#[cfg(feature = "lua52")]
{
if libs.contains(StdLib::BIT) {
ffi::safe::luaL_requiref(state, ffi::LUA_BITLIBNAME, ffi::luaopen_bit32, 1)?;
requiref(state, ffi::LUA_BITLIBNAME, ffi::luaopen_bit32, 1)?;
ffi::lua_pop(state, 1);
}
}
@ -2309,42 +2359,39 @@ unsafe fn load_from_std_lib(state: *mut ffi::lua_State, libs: StdLib) -> Result<
#[cfg(feature = "luajit")]
{
if libs.contains(StdLib::BIT) {
ffi::safe::luaL_requiref(state, ffi::LUA_BITLIBNAME, ffi::luaopen_bit, 1)?;
requiref(state, ffi::LUA_BITLIBNAME, ffi::luaopen_bit, 1)?;
ffi::lua_pop(state, 1);
}
}
if libs.contains(StdLib::MATH) {
ffi::safe::luaL_requiref(state, ffi::LUA_MATHLIBNAME, ffi::luaopen_math, 1)?;
requiref(state, ffi::LUA_MATHLIBNAME, ffi::luaopen_math, 1)?;
ffi::lua_pop(state, 1);
}
if libs.contains(StdLib::DEBUG) {
ffi::safe::luaL_requiref(state, ffi::LUA_DBLIBNAME, ffi::luaopen_debug, 1)?;
requiref(state, ffi::LUA_DBLIBNAME, ffi::luaopen_debug, 1)?;
ffi::lua_pop(state, 1);
}
if libs.contains(StdLib::PACKAGE) {
ffi::safe::luaL_requiref(state, ffi::LUA_LOADLIBNAME, ffi::luaopen_package, 1)?;
requiref(state, ffi::LUA_LOADLIBNAME, ffi::luaopen_package, 1)?;
ffi::lua_pop(state, 1);
}
#[cfg(feature = "luajit")]
{
if libs.contains(StdLib::JIT) {
ffi::safe::luaL_requiref(state, ffi::LUA_JITLIBNAME, ffi::luaopen_jit, 1)?;
requiref(state, ffi::LUA_JITLIBNAME, ffi::luaopen_jit, 1)?;
ffi::lua_pop(state, 1);
}
if libs.contains(StdLib::FFI) {
ffi::safe::luaL_requiref(state, ffi::LUA_FFILIBNAME, ffi::luaopen_ffi, 1)?;
requiref(state, ffi::LUA_FFILIBNAME, ffi::luaopen_ffi, 1)?;
ffi::lua_pop(state, 1);
}
}
#[cfg(feature = "luajit")]
ffi::lua_gc(state, ffi::LUA_GCRESTART, -1);
Ok(())
}

46
src/scope.rs
View File

@ -17,8 +17,8 @@ use crate::userdata::{
AnyUserData, MetaMethod, UserData, UserDataCell, UserDataFields, UserDataMethods,
};
use crate::util::{
assert_stack, check_stack, get_userdata, init_userdata_metatable, push_userdata, take_userdata,
StackGuard,
assert_stack, check_stack, get_userdata, init_userdata_metatable, push_table, push_userdata,
rawset_field, take_userdata, StackGuard,
};
use crate::value::{FromLua, FromLuaMulti, MultiValue, ToLua, ToLuaMulti, Value};
@ -326,27 +326,27 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
// Prepare metatable, add meta methods first and then meta fields
let meta_methods_nrec = ud_methods.meta_methods.len() + ud_fields.meta_fields.len() + 1;
ffi::safe::lua_createtable(lua.state, 0, meta_methods_nrec as c_int)?;
push_table(lua.state, 0, meta_methods_nrec as c_int)?;
for (k, m) in ud_methods.meta_methods {
let data = data.clone();
lua.push_value(Value::Function(wrap_method(self, data, data_ptr, m)?))?;
ffi::safe::lua_rawsetfield(lua.state, -2, k.validate()?.name())?;
rawset_field(lua.state, -2, k.validate()?.name())?;
}
for (k, f) in ud_fields.meta_fields {
lua.push_value(f(mem::transmute(lua))?)?;
ffi::safe::lua_rawsetfield(lua.state, -2, k.validate()?.name())?;
rawset_field(lua.state, -2, k.validate()?.name())?;
}
let metatable_index = ffi::lua_absindex(lua.state, -1);
let mut field_getters_index = None;
let field_getters_nrec = ud_fields.field_getters.len();
if field_getters_nrec > 0 {
ffi::safe::lua_createtable(lua.state, 0, field_getters_nrec as c_int)?;
push_table(lua.state, 0, field_getters_nrec as c_int)?;
for (k, m) in ud_fields.field_getters {
let data = data.clone();
lua.push_value(Value::Function(wrap_method(self, data, data_ptr, m)?))?;
ffi::safe::lua_rawsetfield(lua.state, -2, &k)?;
rawset_field(lua.state, -2, &k)?;
}
field_getters_index = Some(ffi::lua_absindex(lua.state, -1));
}
@ -354,11 +354,11 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
let mut field_setters_index = None;
let field_setters_nrec = ud_fields.field_setters.len();
if field_setters_nrec > 0 {
ffi::safe::lua_createtable(lua.state, 0, field_setters_nrec as c_int)?;
push_table(lua.state, 0, field_setters_nrec as c_int)?;
for (k, m) in ud_fields.field_setters {
let data = data.clone();
lua.push_value(Value::Function(wrap_method(self, data, data_ptr, m)?))?;
ffi::safe::lua_rawsetfield(lua.state, -2, &k)?;
rawset_field(lua.state, -2, &k)?;
}
field_setters_index = Some(ffi::lua_absindex(lua.state, -1));
}
@ -367,11 +367,11 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
let methods_nrec = ud_methods.methods.len();
if methods_nrec > 0 {
// Create table used for methods lookup
ffi::safe::lua_createtable(lua.state, 0, methods_nrec as c_int)?;
push_table(lua.state, 0, methods_nrec as c_int)?;
for (k, m) in ud_methods.methods {
let data = data.clone();
lua.push_value(Value::Function(wrap_method(self, data, data_ptr, m)?))?;
ffi::safe::lua_rawsetfield(lua.state, -2, &k)?;
rawset_field(lua.state, -2, &k)?;
}
methods_index = Some(ffi::lua_absindex(lua.state, -1));
}
@ -456,15 +456,15 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
// We know the destructor has not run yet because we hold a reference to the callback.
ffi::lua_getupvalue(state, -1, 2);
ffi::lua_getupvalue(state, -1, 1);
let ud1 = take_userdata::<Callback>(state);
ffi::lua_pushnil(state);
ffi::lua_setupvalue(state, -2, 2);
ffi::lua_setupvalue(state, -2, 1);
ffi::lua_getupvalue(state, -1, 3);
ffi::lua_getupvalue(state, -1, 2);
let ud2 = take_userdata::<Lua>(state);
ffi::lua_pushnil(state);
ffi::lua_setupvalue(state, -2, 3);
ffi::lua_setupvalue(state, -2, 2);
vec![Box::new(ud1), Box::new(ud2)]
});
@ -506,15 +506,15 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
ffi::lua_rawget(state, -2);
// Destroy all upvalues
ffi::lua_getupvalue(state, -1, 2);
ffi::lua_getupvalue(state, -1, 1);
let ud1 = take_userdata::<AsyncCallback>(state);
ffi::lua_pushnil(state);
ffi::lua_setupvalue(state, -2, 2);
ffi::lua_setupvalue(state, -2, 1);
ffi::lua_getupvalue(state, -1, 3);
ffi::lua_getupvalue(state, -1, 2);
let ud2 = take_userdata::<Lua>(state);
ffi::lua_pushnil(state);
ffi::lua_setupvalue(state, -2, 3);
ffi::lua_setupvalue(state, -2, 2);
ffi::lua_pop(state, 1);
let mut data: Vec<Box<dyn Any>> = vec![Box::new(ud1), Box::new(ud2)];
@ -522,16 +522,16 @@ impl<'lua, 'scope> Scope<'lua, 'scope> {
// Finally, get polled future and destroy it
f.lua.push_ref(&poll_str.0);
if ffi::lua_rawget(state, -2) == ffi::LUA_TFUNCTION {
ffi::lua_getupvalue(state, -1, 2);
ffi::lua_getupvalue(state, -1, 1);
let ud3 = take_userdata::<LocalBoxFuture<Result<MultiValue>>>(state);
ffi::lua_pushnil(state);
ffi::lua_setupvalue(state, -2, 2);
ffi::lua_setupvalue(state, -2, 1);
data.push(Box::new(ud3));
ffi::lua_getupvalue(state, -1, 3);
ffi::lua_getupvalue(state, -1, 2);
let ud4 = take_userdata::<Lua>(state);
ffi::lua_pushnil(state);
ffi::lua_setupvalue(state, -2, 3);
ffi::lua_setupvalue(state, -2, 2);
data.push(Box::new(ud4));
}

18
src/serde/mod.rs
View File

@ -10,7 +10,7 @@ use crate::ffi;
use crate::lua::Lua;
use crate::table::Table;
use crate::types::LightUserData;
use crate::util::{assert_stack, check_stack, StackGuard};
use crate::util::{assert_stack, check_stack, protect_lua, StackGuard};
use crate::value::Value;
/// Trait for serializing/deserializing Lua values using Serde.
@ -200,15 +200,17 @@ impl<'lua> LuaSerdeExt<'lua> for Lua {
// Uses 6 stack spaces and calls checkstack.
pub(crate) unsafe fn init_metatables(state: *mut ffi::lua_State) -> Result<()> {
check_stack(state, 6)?;
check_stack(state, 3)?;
protect_lua(state, 0, 0, |state| {
ffi::lua_createtable(state, 0, 1);
ffi::safe::lua_createtable(state, 0, 1)?;
ffi::lua_pushstring(state, cstr!("__metatable"));
ffi::lua_pushboolean(state, 0);
ffi::lua_rawset(state, -3);
ffi::lua_pushboolean(state, 0);
ffi::safe::lua_rawsetfield(state, -2, "__metatable")?;
let array_metatable_key = &ARRAY_METATABLE_REGISTRY_KEY as *const u8 as *const c_void;
ffi::safe::lua_rawsetp(state, ffi::LUA_REGISTRYINDEX, array_metatable_key)
let array_metatable_key = &ARRAY_METATABLE_REGISTRY_KEY as *const u8 as *const c_void;
ffi::lua_rawsetp(state, ffi::LUA_REGISTRYINDEX, array_metatable_key);
})
}
pub(crate) unsafe fn push_array_metatable(state: *mut ffi::lua_State) {

8
src/serde/ser.rs
View File

@ -9,7 +9,7 @@ use crate::lua::Lua;
use crate::string::String;
use crate::table::Table;
use crate::types::Integer;
use crate::util::{check_stack, StackGuard};
use crate::util::{check_stack, protect_lua, StackGuard};
use crate::value::{ToLua, Value};
/// A struct for serializing Rust values into Lua values.
@ -318,12 +318,14 @@ impl<'lua> ser::SerializeSeq for SerializeVec<'lua> {
let value = lua.to_value_with(value, self.options)?;
unsafe {
let _sg = StackGuard::new(lua.state);
check_stack(lua.state, 6)?;
check_stack(lua.state, 5)?;
lua.push_ref(&self.table.0);
lua.push_value(value)?;
let len = ffi::lua_rawlen(lua.state, -2) as Integer;
ffi::safe::lua_rawseti(lua.state, -2, len + 1)
protect_lua(lua.state, 2, 0, |state| {
ffi::lua_rawseti(state, -2, len + 1);
})
}
}

47
src/table.rs
View File

@ -10,7 +10,7 @@ use crate::error::{Error, Result};
use crate::ffi;
use crate::function::Function;
use crate::types::{Integer, LuaRef};
use crate::util::{assert_stack, check_stack, StackGuard};
use crate::util::{assert_stack, check_stack, protect_lua, StackGuard};
use crate::value::{FromLua, FromLuaMulti, Nil, ToLua, ToLuaMulti, Value};
#[cfg(feature = "async")]
@ -67,7 +67,7 @@ impl<'lua> Table<'lua> {
lua.push_ref(&self.0);
lua.push_value(key)?;
lua.push_value(value)?;
ffi::safe::lua_settable(lua.state, -3)
protect_lua(lua.state, 3, 0, |state| ffi::lua_settable(state, -3))
}
}
@ -105,7 +105,7 @@ impl<'lua> Table<'lua> {
lua.push_ref(&self.0);
lua.push_value(key)?;
ffi::safe::lua_gettable(lua.state, -2)?;
protect_lua(lua.state, 2, 1, |state| ffi::lua_gettable(state, -2))?;
lua.pop_value()
};
@ -123,9 +123,9 @@ impl<'lua> Table<'lua> {
lua.push_ref(&self.0);
lua.push_value(key)?;
ffi::safe::lua_gettable(lua.state, -2)?;
Ok(ffi::lua_isnil(lua.state, -1) == 0)
protect_lua(lua.state, 2, 1, |state| {
ffi::lua_gettable(state, -2) != ffi::LUA_TNIL
})
}
}
@ -198,7 +198,7 @@ impl<'lua> Table<'lua> {
lua.push_ref(&self.0);
lua.push_value(key)?;
lua.push_value(value)?;
ffi::safe::lua_rawset(lua.state, -3)
protect_lua(lua.state, 3, 0, |state| ffi::lua_rawset(state, -3))
}
}
@ -232,11 +232,18 @@ impl<'lua> Table<'lua> {
let value = value.to_lua(lua)?;
unsafe {
let _sg = StackGuard::new(lua.state);
check_stack(lua.state, 6)?;
check_stack(lua.state, 5)?;
lua.push_ref(&self.0);
lua.push_value(value)?;
ffi::safe::lua_rawinsert(lua.state, -2, idx)
protect_lua(lua.state, 2, 0, |state| {
for i in (idx..=size).rev() {
// table[i+1] = table[i]
ffi::lua_rawgeti(state, -2, i);
ffi::lua_rawseti(state, -3, i + 1);
}
ffi::lua_rawseti(state, -2, idx)
})
}
}
@ -258,10 +265,17 @@ impl<'lua> Table<'lua> {
}
unsafe {
let _sg = StackGuard::new(lua.state);
check_stack(lua.state, 5)?;
check_stack(lua.state, 4)?;
lua.push_ref(&self.0);
ffi::safe::lua_rawremove(lua.state, -1, idx)
protect_lua(lua.state, 1, 0, |state| {
for i in idx..size {
ffi::lua_rawgeti(state, -1, i + 1);
ffi::lua_rawseti(state, -2, i);
}
ffi::lua_pushnil(state);
ffi::lua_rawseti(state, -2, size);
})
}
}
_ => self.raw_set(key, Nil),
@ -280,7 +294,7 @@ impl<'lua> Table<'lua> {
check_stack(lua.state, 4)?;
lua.push_ref(&self.0);
ffi::safe::luaL_len(lua.state, -1)
protect_lua(lua.state, 1, 0, |state| ffi::luaL_len(state, -1))
}
}
@ -657,7 +671,10 @@ where
lua.push_ref(&self.table);
lua.push_value(prev_key)?;
if ffi::safe::lua_next(lua.state, -2)? != 0 {
let next = protect_lua(lua.state, 2, ffi::LUA_MULTRET, |state| {
ffi::lua_next(state, -2)
})?;
if next != 0 {
let value = lua.pop_value();
let key = lua.pop_value();
Ok(Some((
@ -709,13 +726,13 @@ where
let res = (|| unsafe {
let _sg = StackGuard::new(lua.state);
check_stack(lua.state, 1 + if self.raw { 0 } else { 4 })?;
check_stack(lua.state, 1 + if self.raw { 0 } else { 3 })?;
lua.push_ref(&self.table);
let res = if self.raw {
ffi::lua_rawgeti(lua.state, -1, index)
} else {
ffi::safe::lua_geti(lua.state, -1, index)?
protect_lua(lua.state, 1, 1, |state| ffi::lua_geti(state, -1, index))?
};
match res {
ffi::LUA_TNIL if index > self.len.unwrap_or(0) => Ok(None),

4
src/thread.rs
View File

@ -4,7 +4,7 @@ use std::os::raw::c_int;
use crate::error::{Error, Result};
use crate::ffi;
use crate::types::LuaRef;
use crate::util::{assert_stack, check_stack, pop_error, StackGuard};
use crate::util::{assert_stack, check_stack, error_traceback, pop_error, protect_lua, StackGuard};
use crate::value::{FromLuaMulti, MultiValue, ToLuaMulti};
#[cfg(any(feature = "lua54", all(feature = "luajit", feature = "vendored"), doc))]
@ -135,7 +135,7 @@ impl<'lua> Thread<'lua> {
let ret = ffi::lua_resume(thread_state, lua.state, nargs, &mut nresults as *mut c_int);
if ret != ffi::LUA_OK && ret != ffi::LUA_YIELD {
ffi::safe::error_traceback2(lua.state, thread_state)?;
protect_lua(lua.state, 0, 0, |_| error_traceback(thread_state))?;
return Err(pop_error(thread_state, ret));
}

6
src/userdata.rs
View File

@ -20,7 +20,9 @@ use crate::function::Function;
use crate::lua::Lua;
use crate::table::{Table, TablePairs};
use crate::types::{Callback, LuaRef, MaybeSend};
use crate::util::{check_stack, get_destructed_userdata_metatable, get_userdata, StackGuard};
use crate::util::{
check_stack, get_destructed_userdata_metatable, get_userdata, push_string, StackGuard,
};
use crate::value::{FromLua, FromLuaMulti, ToLua, ToLuaMulti};
#[cfg(any(feature = "lua52", feature = "lua51", feature = "luajit"))]
@ -926,7 +928,7 @@ impl<'lua> AnyUserData<'lua> {
lua.push_userdata_ref(&self.0, true)?;
// Get the special `__mlua_type_id`
ffi::safe::lua_pushstring(lua.state, "__mlua_type_id")?;
push_string(lua.state, "__mlua_type_id")?;
if ffi::lua_rawget(lua.state, -2) != ffi::LUA_TUSERDATA {
return Err(Error::UserDataTypeMismatch);
}

447
src/util.rs
View File

@ -2,7 +2,7 @@ use std::any::{Any, TypeId};
use std::collections::HashMap;
use std::error::Error as StdError;
use std::fmt::Write;
use std::os::raw::{c_int, c_void};
use std::os::raw::{c_char, c_int, c_void};
use std::panic::{catch_unwind, resume_unwind, AssertUnwindSafe};
use std::sync::{Arc, Mutex};
use std::{mem, ptr, slice};
@ -17,6 +17,10 @@ static METATABLE_CACHE: Lazy<Mutex<HashMap<TypeId, u8>>> = Lazy::new(|| {
Mutex::new(HashMap::with_capacity(32))
});
// I believe `luaL_traceback` < 5.4 requires this much free stack to not error.
// 5.4 uses `luaL_Buffer`
const LUA_TRACEBACK_STACK: c_int = 11;
// Checks that Lua has enough free stack space for future stack operations. On failure, this will
// panic with an internal error message.
pub unsafe fn assert_stack(state: *mut ffi::lua_State, amount: c_int) {
@ -85,27 +89,71 @@ impl Drop for StackGuard {
// Call a function that calls into the Lua API and may trigger a Lua error (longjmp) in a safe way.
// Wraps the inner function in a call to `lua_pcall`, so the inner function only has access to a
// limited lua stack. `nargs` is the same as the the parameter to `lua_pcall`, and `nresults` is
// always LUA_MULTRET. Internally uses 2 extra stack spaces, and does not call checkstack.
// Provided function must *never* panic.
pub unsafe fn protect_lua(
// limited lua stack. `nargs` and `nresults` are similar to the parameters of `lua_pcall`, but the
// given function return type is not the return value count, instead the inner function return
// values are assumed to match the `nresults` param. Provided function must *not* panic, and since it
// will generally be lonjmping, should not contain any values that implements Drop.
// Internally uses 3 extra stack spaces, and does not call checkstack.
pub unsafe fn protect_lua<F, R>(
state: *mut ffi::lua_State,
nargs: c_int,
f: unsafe extern "C" fn(*mut ffi::lua_State) -> c_int, // Must be "C-unwind" after stabilizing
) -> Result<()> {
nresults: c_int,
f: F,
) -> Result<R>
where
F: Fn(*mut ffi::lua_State) -> R,
R: Copy,
{
union URes<R: Copy> {
uninit: (),
init: R,
}
struct Params<F, R: Copy> {
function: F,
result: URes<R>,
nresults: c_int,
}
unsafe extern "C" fn do_call<F, R>(state: *mut ffi::lua_State) -> c_int
where
R: Copy,
F: Fn(*mut ffi::lua_State) -> R,
{
let params = ffi::lua_touserdata(state, -1) as *mut Params<F, R>;
ffi::lua_pop(state, 1);
(*params).result.init = ((*params).function)(state);
if (*params).nresults == ffi::LUA_MULTRET {
ffi::lua_gettop(state)
} else {
(*params).nresults
}
}
let stack_start = ffi::lua_gettop(state) - nargs;
ffi::lua_pushcfunction(state, ffi::safe::error_traceback);
ffi::lua_pushcfunction(state, f);
ffi::lua_pushcfunction(state, error_traceback);
ffi::lua_pushcfunction(state, do_call::<F, R>);
if nargs > 0 {
ffi::lua_rotate(state, stack_start + 1, 2);
}
let ret = ffi::lua_pcall(state, nargs, ffi::LUA_MULTRET, stack_start + 1);
let mut params = Params {
function: f,
result: URes { uninit: () },
nresults,
};
ffi::lua_pushlightuserdata(state, &mut params as *mut Params<F, R> as *mut c_void);
let ret = ffi::lua_pcall(state, nargs + 1, nresults, stack_start + 1);
ffi::lua_remove(state, stack_start + 1);
if ret == ffi::LUA_OK {
Ok(())
// `LUA_OK` is only returned when the `do_call` function has completed successfully, so
// `params.result` is definitely initialized.
Ok(params.result.init)
} else {
Err(pop_error(state, ret))
}
@ -162,9 +210,41 @@ pub unsafe fn pop_error(state: *mut ffi::lua_State, err_code: c_int) -> Error {
}
}
// Uses 3 stack spaces
pub unsafe fn push_string<S: AsRef<[u8]> + ?Sized>(
state: *mut ffi::lua_State,
s: &S,
) -> Result<()> {
let s = s.as_ref();
protect_lua(state, 0, 1, |state| {
ffi::lua_pushlstring(state, s.as_ptr() as *const c_char, s.len());
})
}
// Uses 3 stack spaces
pub unsafe fn push_table(state: *mut ffi::lua_State, narr: c_int, nrec: c_int) -> Result<()> {
protect_lua(state, 0, 1, |state| ffi::lua_createtable(state, narr, nrec))
}
// Uses 4 stack spaces
pub unsafe fn rawset_field<S>(state: *mut ffi::lua_State, table: c_int, field: &S) -> Result<()>
where
S: AsRef<[u8]> + ?Sized,
{
let field = field.as_ref();
ffi::lua_pushvalue(state, table);
protect_lua(state, 2, 0, |state| {
ffi::lua_pushlstring(state, field.as_ptr() as *const c_char, field.len());
ffi::lua_rotate(state, -3, 2);
ffi::lua_rawset(state, -3)
})
}
// Internally uses 3 stack spaces, does not call checkstack.
pub unsafe fn push_userdata<T>(state: *mut ffi::lua_State, t: T) -> Result<()> {
let ud = ffi::safe::lua_newuserdata(state, mem::size_of::<T>())? as *mut T;
let ud = protect_lua(state, 0, 1, |state| {
ffi::lua_newuserdata(state, mem::size_of::<T>()) as *mut T
})?;
ptr::write(ud, t);
Ok(())
}
@ -230,13 +310,99 @@ pub unsafe fn init_userdata_metatable<T>(
field_setters: Option<c_int>,
methods: Option<c_int>,
) -> Result<()> {
// Wrapper to lookup in `field_getters` first, then `methods`, ending original `__index`.
// Used only if `field_getters` or `methods` set.
unsafe extern "C" fn meta_index_impl(state: *mut ffi::lua_State) -> c_int {
// stack: self, key
ffi::luaL_checkstack(state, 2, ptr::null());
// lookup in `field_getters` table
if ffi::lua_isnil(state, ffi::lua_upvalueindex(2)) == 0 {
ffi::lua_pushvalue(state, -1); // `key` arg
if ffi::lua_rawget(state, ffi::lua_upvalueindex(2)) != ffi::LUA_TNIL {
ffi::lua_insert(state, -3); // move function
ffi::lua_pop(state, 1); // remove `key`
ffi::lua_call(state, 1, 1);
return 1;
}
ffi::lua_pop(state, 1); // pop the nil value
}
// lookup in `methods` table
if ffi::lua_isnil(state, ffi::lua_upvalueindex(3)) == 0 {
ffi::lua_pushvalue(state, -1); // `key` arg
if ffi::lua_rawget(state, ffi::lua_upvalueindex(3)) != ffi::LUA_TNIL {
ffi::lua_insert(state, -3);
ffi::lua_pop(state, 2);
return 1;
}
ffi::lua_pop(state, 1); // pop the nil value
}
// lookup in `__index`
ffi::lua_pushvalue(state, ffi::lua_upvalueindex(1));
match ffi::lua_type(state, -1) {
ffi::LUA_TNIL => {
ffi::lua_pop(state, 1); // pop the nil value
let field = ffi::lua_tostring(state, -1);
ffi::luaL_error(state, cstr!("attempt to get an unknown field '%s'"), field);
}
ffi::LUA_TTABLE => {
ffi::lua_insert(state, -2);
ffi::lua_gettable(state, -2);
}
ffi::LUA_TFUNCTION => {
ffi::lua_insert(state, -3);
ffi::lua_call(state, 2, 1);
}
_ => unreachable!(),
}
1
}
// Similar to `meta_index_impl`, checks `field_setters` table first, then `__newindex` metamethod.
// Used only if `field_setters` set.
unsafe extern "C" fn meta_newindex_impl(state: *mut ffi::lua_State) -> c_int {
// stack: self, key, value
ffi::luaL_checkstack(state, 2, ptr::null());
// lookup in `field_setters` table
ffi::lua_pushvalue(state, -2); // `key` arg
if ffi::lua_rawget(state, ffi::lua_upvalueindex(2)) != ffi::LUA_TNIL {
ffi::lua_remove(state, -3); // remove `key`
ffi::lua_insert(state, -3); // move function
ffi::lua_call(state, 2, 0);
return 0;
}
ffi::lua_pop(state, 1); // pop the nil value
// lookup in `__newindex`
ffi::lua_pushvalue(state, ffi::lua_upvalueindex(1));
match ffi::lua_type(state, -1) {
ffi::LUA_TNIL => {
ffi::lua_pop(state, 1); // pop the nil value
let field = ffi::lua_tostring(state, -2);
ffi::luaL_error(state, cstr!("attempt to set an unknown field '%s'"), field);
}
ffi::LUA_TTABLE => {
ffi::lua_insert(state, -3);
ffi::lua_settable(state, -3);
}
ffi::LUA_TFUNCTION => {
ffi::lua_insert(state, -4);
ffi::lua_call(state, 3, 0);
}
_ => unreachable!(),
}
0
}
ffi::lua_pushvalue(state, metatable);
if field_getters.is_some() || methods.is_some() {
ffi::safe::lua_pushstring(state, "__index")?;
ffi::lua_pushvalue(state, -1);
let index_type = ffi::lua_rawget(state, -3);
push_string(state, "__index")?;
let index_type = ffi::lua_rawget(state, -2);
match index_type {
ffi::LUA_TNIL | ffi::LUA_TTABLE | ffi::LUA_TFUNCTION => {
for &idx in &[field_getters, methods] {
@ -246,35 +412,37 @@ pub unsafe fn init_userdata_metatable<T>(
ffi::lua_pushnil(state);
}
}
ffi::safe::lua_pushcclosure(state, ffi::safe::meta_index_impl, 3)?;
protect_lua(state, 3, 1, |state| {
ffi::lua_pushcclosure(state, meta_index_impl, 3)
})?;
}
_ => mlua_panic!("improper __index type {}", index_type),
}
ffi::safe::lua_rawset(state, -3)?;
rawset_field(state, -2, "__index")?;
}
if let Some(field_setters) = field_setters {
ffi::safe::lua_pushstring(state, "__newindex")?;
ffi::lua_pushvalue(state, -1);
let newindex_type = ffi::lua_rawget(state, -3);
push_string(state, "__newindex")?;
let newindex_type = ffi::lua_rawget(state, -2);
match newindex_type {
ffi::LUA_TNIL | ffi::LUA_TTABLE | ffi::LUA_TFUNCTION => {
ffi::lua_pushvalue(state, field_setters);
ffi::safe::lua_pushcclosure(state, ffi::safe::meta_newindex_impl, 2)?;
protect_lua(state, 2, 1, |state| {
ffi::lua_pushcclosure(state, meta_newindex_impl, 2)
})?;
}
_ => mlua_panic!("improper __newindex type {}", newindex_type),
}
ffi::safe::lua_rawset(state, -3)?;
rawset_field(state, -2, "__newindex")?;
}
ffi::safe::lua_pushrclosure(state, userdata_destructor::<T>, 0)?;
ffi::safe::lua_rawsetfield(state, -2, "__gc")?;
ffi::lua_pushcfunction(state, userdata_destructor::<T>);
rawset_field(state, -2, "__gc")?;
ffi::lua_pushboolean(state, 0);
ffi::safe::lua_rawsetfield(state, -2, "__metatable")?;
rawset_field(state, -2, "__metatable")?;
ffi::lua_pop(state, 1);
@ -290,21 +458,39 @@ pub unsafe extern "C" fn userdata_destructor<T>(state: *mut ffi::lua_State) -> c
}
// In the context of a lua callback, this will call the given function and if the given function
// returns an error, *or if the given function panics*, this will result in a call to lua_error (a
// longjmp) by a C shim. The error or panic is wrapped in such a way that when calling pop_error back
// on the rust side, it will resume the panic (or when popping a panic value from the stack).
// returns an error, *or if the given function panics*, this will result in a call to `lua_error` (a
// longjmp). The error or panic is wrapped in such a way that when calling `pop_error` back on
// the Rust side, it will resume the panic.
//
// This function assumes the structure of the stack at the beginning of a callback, that the only
// elements on the stack are the arguments to the callback.
//
// This function uses some of the bottom of the stack for error handling, the given callback will be
// given the number of arguments available as an argument, and should return the number of returns
// as normal, but cannot assume that the arguments available start at 1.
pub unsafe fn callback_error<F>(state: *mut ffi::lua_State, f: F) -> c_int
// as normal, but cannot assume that the arguments available start at 0.
pub unsafe fn callback_error<F, R>(state: *mut ffi::lua_State, f: F) -> R
where
F: FnOnce(c_int) -> Result<c_int>,
F: FnOnce(c_int) -> Result<R>,
{
let nargs = ffi::lua_gettop(state) - 1;
let nargs = ffi::lua_gettop(state);
// We need one extra stack space to store preallocated memory, and at least 2
// stack spaces overall for handling error metatables
let extra_stack = if nargs < 2 { 2 - nargs } else { 1 };
ffi::luaL_checkstack(
state,
extra_stack,
cstr!("not enough stack space for callback error handling"),
);
// We cannot shadow Rust errors with Lua ones, we pre-allocate enough memory
// to store a wrapped error or panic *before* we proceed.
let ud = ffi::lua_newuserdata(
state,
mem::size_of::<WrappedError>().max(mem::size_of::<WrappedPanic>()),
);
ffi::lua_rotate(state, 1, 1);
match catch_unwind(AssertUnwindSafe(|| f(nargs))) {
Ok(Ok(r)) => {
ffi::lua_remove(state, 1);
@ -312,42 +498,120 @@ where
}
Ok(Err(err)) => {
ffi::lua_settop(state, 1);
let error_ud = ffi::lua_touserdata(state, 1);
ptr::write(error_ud as *mut WrappedError, WrappedError(err));
let wrapped_error = ud as *mut WrappedError;
ptr::write(wrapped_error, WrappedError(err));
get_gc_metatable_for::<WrappedError>(state);
ffi::lua_setmetatable(state, -2);
-1
// Convert to CallbackError and attach traceback
let traceback = if ffi::lua_checkstack(state, LUA_TRACEBACK_STACK) != 0 {
ffi::luaL_traceback(state, state, ptr::null(), 0);
let traceback = to_string(state, -1);
ffi::lua_pop(state, 1);
traceback
} else {
"<not enough stack space for traceback>".to_string()
};
let cause = Arc::new((*wrapped_error).0.clone());
(*wrapped_error).0 = Error::CallbackError { traceback, cause };
ffi::lua_error(state)
}
Err(p) => {
ffi::lua_settop(state, 1);
let error_ud = ffi::lua_touserdata(state, 1);
ptr::write(error_ud as *mut WrappedPanic, WrappedPanic(Some(p)));
ptr::write(ud as *mut WrappedPanic, WrappedPanic(Some(p)));
get_gc_metatable_for::<WrappedPanic>(state);
ffi::lua_setmetatable(state, -2);
-2
ffi::lua_error(state)
}
}
}
// A part of the C shim for errors handling.
// Receives indexes of error and traceback (optional) in the stack.
// Converts error into a `CallbackError` and attaches the traceback provided.
#[no_mangle]
pub unsafe extern "C" fn wrapped_error_traceback(
state: *mut ffi::lua_State,
error_idx: c_int,
traceback_idx: c_int,
) {
let wrapped_error = mlua_expect!(
get_gc_userdata::<WrappedError>(state, error_idx).as_mut(),
"cannot get <WrappedError>"
);
let traceback = match traceback_idx {
0 => "<not enough stack space for traceback>".to_string(),
_ => to_string(state, traceback_idx),
};
let cause = Arc::new(wrapped_error.0.clone());
wrapped_error.0 = Error::CallbackError { traceback, cause };
pub unsafe extern "C" fn error_traceback(state: *mut ffi::lua_State) -> c_int {
if ffi::lua_checkstack(state, 2) == 0 {
// If we don't have enough stack space to even check the error type, do
// nothing so we don't risk shadowing a rust panic.
return 1;
}
if get_gc_userdata::<WrappedError>(state, -1).is_null()
&& get_gc_userdata::<WrappedPanic>(state, -1).is_null()
{
let s = ffi::luaL_tolstring(state, -1, ptr::null_mut());
if ffi::lua_checkstack(state, LUA_TRACEBACK_STACK) != 0 {
ffi::luaL_traceback(state, state, s, 1);
ffi::lua_remove(state, -2);
}
}
1
}
// A variant of `pcall` that does not allow Lua to catch Rust panics from `callback_error`.
pub unsafe extern "C" fn safe_pcall(state: *mut ffi::lua_State) -> c_int {
ffi::luaL_checkstack(state, 2, ptr::null());
let top = ffi::lua_gettop(state);
if top == 0 {
ffi::lua_pushstring(state, cstr!("not enough arguments to pcall"));
ffi::lua_error(state);
}
if ffi::lua_pcall(state, top - 1, ffi::LUA_MULTRET, 0) == ffi::LUA_OK {
ffi::lua_pushboolean(state, 1);
ffi::lua_insert(state, 1);
ffi::lua_gettop(state)
} else {
if !get_gc_userdata::<WrappedPanic>(state, -1).is_null() {
ffi::lua_error(state);
}
ffi::lua_pushboolean(state, 0);
ffi::lua_insert(state, -2);
2
}
}
// A variant of `xpcall` that does not allow Lua to catch Rust panics from `callback_error`.
pub unsafe extern "C" fn safe_xpcall(state: *mut ffi::lua_State) -> c_int {
unsafe extern "C" fn xpcall_msgh(state: *mut ffi::lua_State) -> c_int {
ffi::luaL_checkstack(state, 2, ptr::null());
if !get_gc_userdata::<WrappedPanic>(state, -1).is_null() {
1
} else {
ffi::lua_pushvalue(state, ffi::lua_upvalueindex(1));
ffi::lua_insert(state, 1);
ffi::lua_call(state, ffi::lua_gettop(state) - 1, ffi::LUA_MULTRET);
ffi::lua_gettop(state)
}
}
ffi::luaL_checkstack(state, 2, ptr::null());
let top = ffi::lua_gettop(state);
if top < 2 {
ffi::lua_pushstring(state, cstr!("not enough arguments to xpcall"));
ffi::lua_error(state);
}
ffi::lua_pushvalue(state, 2);
ffi::lua_pushcclosure(state, xpcall_msgh, 1);
ffi::lua_copy(state, 1, 2);
ffi::lua_replace(state, 1);
if ffi::lua_pcall(state, ffi::lua_gettop(state) - 2, ffi::LUA_MULTRET, 1) == ffi::LUA_OK {
ffi::lua_pushboolean(state, 1);
ffi::lua_insert(state, 2);
ffi::lua_gettop(state) - 1
} else {
if !get_gc_userdata::<WrappedPanic>(state, -1).is_null() {
ffi::lua_error(state);
}
ffi::lua_pushboolean(state, 0);
ffi::lua_insert(state, -2);
2
}
}
// Returns Lua main thread for Lua >= 5.2 or checks that the passed thread is main for Lua 5.1.
@ -374,13 +638,9 @@ pub unsafe fn get_main_state(state: *mut ffi::lua_State) -> Option<*mut ffi::lua
}
// Pushes a WrappedError to the top of the stack.
// Uses 2 stack spaces and does not call checkstack.
// Uses 3 stack spaces and does not call checkstack.
pub unsafe fn push_wrapped_error(state: *mut ffi::lua_State, err: Error) -> Result<()> {
let error_ud = ffi::safe::lua_newwrappederror(state)? as *mut WrappedError;
ptr::write(error_ud, WrappedError(err));
get_gc_metatable_for::<WrappedError>(state);
ffi::lua_setmetatable(state, -2);
Ok(())
push_gc_userdata::<WrappedError>(state, WrappedError(err))
}
// Checks if the value at the given index is a WrappedError, and if it is returns a pointer to it,
@ -399,7 +659,7 @@ pub unsafe fn get_wrapped_error(state: *mut ffi::lua_State, index: c_int) -> *co
pub unsafe fn init_gc_metatable_for<T: Any>(
state: *mut ffi::lua_State,
customize_fn: Option<fn(*mut ffi::lua_State) -> Result<()>>,
) -> Result<*const u8> {
) -> Result<()> {
check_stack(state, 6)?;
let type_id = TypeId::of::<T>();
@ -413,21 +673,23 @@ pub unsafe fn init_gc_metatable_for<T: Any>(
&mt_cache[&type_id] as *const u8
};
ffi::safe::lua_createtable(state, 0, 3)?;
push_table(state, 0, 3)?;
ffi::safe::lua_pushrclosure(state, userdata_destructor::<T>, 0)?;
ffi::safe::lua_rawsetfield(state, -2, "__gc")?;
ffi::lua_pushcfunction(state, userdata_destructor::<T>);
rawset_field(state, -2, "__gc")?;
ffi::lua_pushboolean(state, 0);
ffi::safe::lua_rawsetfield(state, -2, "__metatable")?;
rawset_field(state, -2, "__metatable")?;
if let Some(f) = customize_fn {
f(state)?;
}
ffi::safe::lua_rawsetp(state, ffi::LUA_REGISTRYINDEX, ref_addr as *mut c_void)?;
protect_lua(state, 1, 0, |state| {
ffi::lua_rawsetp(state, ffi::LUA_REGISTRYINDEX, ref_addr as *mut c_void)
})?;
Ok(ref_addr)
Ok(())
}
pub unsafe fn get_gc_metatable_for<T: Any>(state: *mut ffi::lua_State) {
@ -441,7 +703,7 @@ pub unsafe fn get_gc_metatable_for<T: Any>(state: *mut ffi::lua_State) {
// Initialize the error, panic, and destructed userdata metatables.
// Returns address of WrappedError and WrappedPanic metatables in Lua registry.
pub unsafe fn init_error_registry(state: *mut ffi::lua_State) -> Result<(*const u8, *const u8)> {
pub unsafe fn init_error_registry(state: *mut ffi::lua_State) -> Result<()> {
check_stack(state, 7)?;
// Create error and panic metatables
@ -509,44 +771,37 @@ pub unsafe fn init_error_registry(state: *mut ffi::lua_State) -> Result<(*const
Err(Error::UserDataTypeMismatch)
}?;
ffi::safe::lua_pushstring(state, &*err_buf)?;
push_string(state, &*err_buf)?;
(*err_buf).clear();
Ok(1)
})
}
let wrapped_error_key = init_gc_metatable_for::<WrappedError>(
init_gc_metatable_for::<WrappedError>(
state,
Some(|state| {
ffi::safe::lua_pushrclosure(state, error_tostring, 0)?;
ffi::safe::lua_rawsetfield(state, -2, "__tostring")
ffi::lua_pushcfunction(state, error_tostring);
rawset_field(state, -2, "__tostring")
}),
)?;
let wrapped_panic_key = init_gc_metatable_for::<WrappedPanic>(
init_gc_metatable_for::<WrappedPanic>(
state,
Some(|state| {
ffi::safe::lua_pushrclosure(state, error_tostring, 0)?;
ffi::safe::lua_rawsetfield(state, -2, "__tostring")
ffi::lua_pushcfunction(state, error_tostring);
rawset_field(state, -2, "__tostring")
}),
)?;
// Create destructed userdata metatable
unsafe extern "C" fn destructed_error(state: *mut ffi::lua_State) -> c_int {
callback_error(state, |_| {
check_stack(state, 2)?;
let error_ud = ffi::safe::lua_newwrappederror(state)? as *mut WrappedError;
ptr::write(error_ud, WrappedError(Error::CallbackDestructed));
get_gc_metatable_for::<WrappedError>(state);
ffi::lua_setmetatable(state, -2);
Ok(-1) // to trigger lua_error
})
callback_error(state, |_| Err(Error::CallbackDestructed))
}
ffi::safe::lua_createtable(state, 0, 26)?;
ffi::safe::lua_pushrclosure(state, destructed_error, 0)?;
push_table(state, 0, 26)?;
ffi::lua_pushcfunction(state, destructed_error);
for &method in &[
"__add",
"__sub",
@ -586,20 +841,24 @@ pub unsafe fn init_error_registry(state: *mut ffi::lua_State) -> Result<(*const
"__close",
] {
ffi::lua_pushvalue(state, -1);
ffi::safe::lua_rawsetfield(state, -3, method)?;
rawset_field(state, -3, method)?;
}
ffi::lua_pop(state, 1);
let destructed_metatable_key = &DESTRUCTED_USERDATA_METATABLE as *const u8 as *const c_void;
ffi::safe::lua_rawsetp(state, ffi::LUA_REGISTRYINDEX, destructed_metatable_key)?;
protect_lua(state, 1, 0, |state| {
ffi::lua_rawsetp(state, ffi::LUA_REGISTRYINDEX, destructed_metatable_key)
})?;
// Create error print buffer
init_gc_metatable_for::<String>(state, None)?;
push_gc_userdata(state, String::new())?;
let err_buf_key = &ERROR_PRINT_BUFFER_KEY as *const u8 as *const c_void;
ffi::safe::lua_rawsetp(state, ffi::LUA_REGISTRYINDEX, err_buf_key)?;
protect_lua(state, 1, 0, |state| {
ffi::lua_rawsetp(state, ffi::LUA_REGISTRYINDEX, err_buf_key)
})?;
Ok((wrapped_error_key, wrapped_panic_key))
Ok(())
}
pub(crate) struct WrappedError(pub Error);