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Author SHA1 Message Date
Roberto Ierusalimschy
42d40581dd Save stack space while handling errors 
Because error handling (luaG_errormsg) uses slots from EXTRA_STACK,
and some errors can recur (e.g., string overflow while creating an
error message in 'luaG_runerror', or a C-stack overflow before calling
the message handler), the code should use stack slots with parsimony.

This commit fixes the bug "Lua-stack overflow when C stack overflows
while handling an error".
 2022-05-20 13:14:33 -03:00
Roberto Ierusalimschy
e435aaabef Details (identation and typos) 2022-05-10 11:13:39 -03:00
Roberto Ierusalimschy
315639d3bb Factoring out common parts of 'codearith' and 'codebitwise' 2022-05-06 17:52:46 -03:00
Roberto Ierusalimschy
c764ca71a6 Bug: Wrong code generation in bitwise operations 2022-04-25 14:42:51 -03:00
Roberto Ierusalimschy
295cde9454 New release number (5.4.5) 2022-04-07 10:52:15 -03:00
Roberto Ierusalimschy
f3cfd5bf2b Details 
Comments + manual + identation + asserts about stack limits that were
not allowing the use of the full stack
 2022-04-01 13:55:44 -03:00
Roberto Ierusalimschy
8426d9b4d4 Avoid computing invalid addresses 
luaV_execute should compute 'ra' only when the instruction uses it.
Computing an illegal address is undefined behavior even if the address
is never dereferenced.
 2022-02-18 13:22:25 -03:00
Roberto Ierusalimschy
1f3c6f4534 Bug: Lua can generate wrong code when _ENV is <const> 2022-02-15 12:28:46 -03:00
Roberto Ierusalimschy
25b143dd34 Bug: lua.c assumes that argv has at least one element 2022-02-07 10:16:35 -03:00
Roberto Ierusalimschy
5d708c3f9c Explanation of borders in the manual 
The explanation includes the limit case of maxinteger being a border.
It also avoids the term "natural", which might include large floats
with natural values.
 2022-01-13 08:15:03 -03:00
Roberto Ierusalimschy
8dd2c912d2 Detail 
Warnings with clang when using long double for Lua floats.
 2022-01-03 09:12:17 -03:00
Roberto Ierusalimschy
05ac2409ee New year (2022) 2022-01-02 07:11:08 -03:00
Roberto Ierusalimschy
597a53bbc6 Bug: finalizer calling exit can corrupt finalization order 
'os.exit' can call lua_close again, separating new finalizers
created after all previous finalizers were already separated.
 2021-12-22 09:00:52 -03:00
Roberto Ierusalimschy
86ec152433 Details 
correction in macro for hard tests + type in comment
 2021-12-21 07:39:25 -03:00
Roberto Ierusalimschy
cf613cdc6f Bug: finalizers can be called with an invalid stack 
The call to 'checkstackGC' can run finalizers, which will find an
inconsistent CallInfo, as 'ci' is half updated at the point of call.
 2021-12-15 11:29:07 -03:00
Roberto Ierusalimschy
066e0f93c4 Fix debug information about finalizers 
The flag CIST_FIN does not mark a finalizer, but the function that was
running when the finalizer was called. (So, the function did not call
the finalizer, but it looks that way in the stack.)
 2021-12-14 12:50:05 -03:00
Roberto Ierusalimschy
0bfc572e51 Bug: GC is not reentrant 
As the GC is not reentrant, finalizers should not be able to invoke it.
 2021-12-13 10:41:17 -03:00
Roberto Ierusalimschy
1de95e97ef Bug: Lua stack still active when closing a state 2021-12-10 10:53:54 -03:00
Roberto Ierusalimschy
ad3942adba Main 'mainposition' replaced by 'mainpositionTV' 
Handle values in table keys as the special cases they are, and not
the other way around.
 2021-11-25 11:07:17 -03:00
Roberto Ierusalimschy
48835c76c8 Wrong assert in 'collectvalidlines' 2021-11-25 10:11:05 -03:00
Roberto Ierusalimschy
6b3e116d44 Corrected bug in 'luaD_tryfuncTM' 
The pointer to the metamethod can be invalidated by a finalizer that
can run during a GC in 'checkstackGCp'. (This commit also fixes a
detail in the manual.) Bug introduced in commit 91673a8ec.
 2021-11-16 14:35:06 -03:00
Roberto Ierusalimschy
e8deac5a41 Avoid OP_VARARGPREP for active lines 
when building the table 'activelines' for a vararg function, this
first instruction does not make the first line active.
 2021-11-10 15:07:14 -03:00
Roberto Ierusalimschy
bfbff3703e Bug: Wrong status in coroutine during reset 
When closing variables during 'coroutine.close' or 'lua_resetthread',
the status of a coroutine must be set to LUA_OK; a coroutine should
not run with any other status. (See assertion in 'lua_callk'.)

After the reset, the status should be kept as normal, as any error
was already reported.
 2021-11-08 11:55:25 -03:00
Roberto Ierusalimschy
74d99057a5 Bug: C stack overflow with coroutines 
'coroutine.resume' did not increment counter of C calls when
continuing execution after a protected error (that is,
while running 'precover').
 2021-11-03 15:04:18 -03:00
Roberto Ierusalimschy
1fce5bea81 More uniform implementation for tail calls 
'luaD_pretailcall' mimics 'luaD_precall', handling call metamethods
and calling C functions directly. That makes the code in the
interpreter loop simpler.

This commit also goes back to emulating the tail call in 'luaD_precall'
with a goto, as C compilers may not do proper tail calls and the C
stack can overflow much sooner than the Lua stack (which grows as the
metamethod is added to it).
 2021-10-29 13:41:24 -03:00
Roberto Ierusalimschy
3699446aaf Removed goto's in 'luaD_precall' 
(plus a detail in lauxlib.h.)
 2021-10-18 11:58:40 -03:00
Roberto Ierusalimschy
0e5071b5fb Avoid taking the address of a 'TValue' field 
That structure can be packed in the future.
 2021-10-11 13:52:26 -03:00
Roberto Ierusalimschy
87a9573b2e Documentation 
Better explanation about the guaranties of multiple assignment in
the manual.
 2021-10-11 13:49:13 -03:00
Roberto Ierusalimschy
deac067ed3 Avoid overflows when incrementing parameters in C 
Any C function can receive maxinteger as an integer argument, and
therefore cannot increment it without some care (e.g., doing unsigned
arithmetic as the core does).
 2021-09-22 13:10:39 -03:00
Roberto Ierusalimschy
2ff3471722 Using 'inline' in some functions 
According to ISO C, "making a function an inline function suggests that
calls to the function be as fast as possible." (Not available in C89.)
 2021-09-15 11:18:41 -03:00
Roberto Ierusalimschy
9db4bfed6b Revamp of format validation in 'string.format' 
When calling 'sprintf', not all conversion specifiers accept all
flags; some combinations are undefined behavior.
 2021-09-03 13:14:56 -03:00
Roberto Ierusalimschy
91673a8ec0 'luaD_tryfuncTM' checks stack space by itself 2021-08-18 12:05:06 -03:00
Roberto Ierusalimschy
41871f1803 Undo simplification of tail calls (commit 901d760) 
Not that simpler and slower.
 2021-08-18 11:21:33 -03:00
Roberto Ierusalimschy
a393ac2554 Detail in 'testes/math.lua' 
Added a print with the random seeds used in the tests of 'random'.
 2021-08-18 10:46:18 -03:00
Roberto Ierusalimschy
65434b4d1b Option '-l' can give a name for the global variable. 
Sintax for this option now is '-l [globname=]modname'.
 2021-08-16 13:57:19 -03:00
Roberto Ierusalimschy
59acd79c05 Added tests for string reuse by the scanner 2021-08-11 11:19:33 -03:00
Roberto Ierusalimschy
e2c07dcbf7 Improved documentation for 'lua_getinfo' 2021-08-11 11:18:10 -03:00
Roberto Ierusalimschy
439e45a2f6 Bug: luaL_tolstring may get confused with negative index 
When object has a '__name' metafield, 'luaL_tolstring' used the
received index after pushing a string on the stack.
 2021-07-22 13:48:43 -03:00
Roberto Ierusalimschy
62fb934427 Bug: Negation in 'luaV_shiftr' may overflow 
Negation of an unchecked lua_Integer overflows with mininteger.
 2021-07-22 13:44:53 -03:00
Roberto Ierusalimschy
8a32e0aa4a Correction on documentation of string-buffer operations 
All string-buffer operations can potentially change the stack in
unspecified ways; the push/pop documentation in the manual should
reflect that.
 2021-07-21 11:33:58 -03:00
Roberto Ierusalimschy
dbdc74dc55 Simplification in the parameters of 'luaD_precall' 
The parameters 'nresults' and 'delta1', in 'luaD_precall', were never
meaningful simultaneously. So, they were combined in a single parameter
'retdel'.
 2021-06-30 12:53:21 -03:00
Roberto Ierusalimschy
6a0dace25a Bug: 'local function' can assign to '<const>' variables 2021-06-20 15:36:36 -03:00
Roberto Ierusalimschy
04e19712a5 C functions can be tail called, too 
A tail call to a C function can have the behavior of a "real" tail
call, reusing the stack frame of the caller.
 2021-06-14 13:28:21 -03:00
Roberto Ierusalimschy
901d760093 Simpler implementation for tail calls 
Tail calls handled by 'luaD_precall', like regular calls, to avoid
code duplication.
 2021-06-11 13:41:07 -03:00
Roberto Ierusalimschy
c0ed74c1e1 Avoid the term "undefined behavior" in the manual 2021-06-09 13:24:49 -03:00
Roberto Ierusalimschy
fc6c74f100 'index2value' more robust 
'index2value' accepts pseudo-indices also when called from a Lua
function, through a hook.
 2021-05-24 16:48:43 -03:00
Roberto Ierusalimschy
1e6918d553 Details 
- Removed unused (and trivial) definition LUA_UNSIGNEDBITS
- Alignment structure in pack/unpack moved to a narrower scope
 2021-05-24 16:48:09 -03:00
Roberto Ierusalimschy
681297187e Bug: yielding in '__close' mess up number of returns 
Yielding in a __close metamethod called when returning vararg results
changes the top and so messes up the number of returned values.
 2021-04-16 15:41:44 -03:00
Roberto Ierusalimschy
5148954eed Align error messages for calling non-callable values 
'pcall(foo)' message was "attempt to call a table value", while
'pcall(function () foo() end) message was "global 'foo' is not callable".
 2021-04-12 16:50:34 -03:00
Roberto Ierusalimschy
d205f3a484 Bug: Lua source should not use C99 comments ("//") 2021-04-10 10:19:21 -03:00