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* Detailsv5.4.5Roberto Ierusalimschy2023-04-181-4/+4
| | | | Typos in comments and details in the manual.
* Stack indices changed to union'sRoberto Ierusalimschy2022-10-291-3/+3
| | | | | That will allow to change pointers to offsets while reallocating the stack.
* Bug: 'break' may not properly close variable in a 'for' loopRoberto Ierusalimschy2022-08-241-8/+8
| | | | | | | Function 'leaveblock' was generating "break" label before removing variables from the closing block. If 'createlabel' created a 'close' instruction (which it did when matching a goto/break that exited the scope of an upvalue), that instruction would use the wrong level.
* Bug: Lua can generate wrong code when _ENV is <const>Roberto Ierusalimschy2022-02-151-0/+1
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* Bug: 'local function' can assign to '<const>' variablesRoberto Ierusalimschy2021-06-201-0/+1
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* Bug: tbc variables in "for" loops don't avoid tail callsRoberto Ierusalimschy2021-04-071-6/+15
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* Broadening the use of branch hintsRoberto Ierusalimschy2021-02-241-4/+4
| | | | | | More uses of macros 'likely'/'unlikely' (renamed to 'l_likely'/'l_unlikely'), both in range (extended to the libraries) and in scope (extended to hooks, stack growth).
* DetailsRoberto Ierusalimschy2020-12-021-23/+23
| | | | Names in the parser and other details that do not change actual code.
* Removed optimization for «if ... then goto»Roberto Ierusalimschy2020-11-111-44/+6
| | | | | That optimization was too complex and caused some weird traces when debugging. The more common case «if ... then break» was kept.
* CommentsRoberto Ierusalimschy2020-10-221-4/+4
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* Revision of stackless implementationRoberto Ierusalimschy2020-10-121-5/+1
| | | | | | - more organized handling of 'nCcalls' - comments - deprecation of 'setcstacklimit'
* Back to a stackless implementationRoberto Ierusalimschy2020-10-121-5/+7
| | | | | | | | | | | | | A "with stack" implementation gains too little in performance to be worth all the noise from C-stack overflows. This commit is almost a sketch, to test performance. There are several pending stuff: - review control of C-stack overflow and error messages; - what to do with setcstacklimit; - review comments; - review unroll of Lua calls.
* Fixed missing GC barriers in compiler and undumpRoberto Ierusalimschy2020-06-161-0/+3
| | | | | While building a new prototype, the GC needs barriers for every object (strings and nested prototypes) that is attached to the new prototype.
* Fixed two bugs in to-be-closed variables x constantsRoberto Ierusalimschy2020-06-011-28/+36
| | | | | | | | | | The parser were mixing compiler indices of variables with stack indices, so that when a to-be-closed variable was used inside the scope of compile-time constants (which may be optimized away), it might be closed in the wrong place. (See new tests for examples.) Besides fixing the bugs, this commit also changed comments and variable names to avoid that kind of confusion and added tests.
* Small issue in 'exprstat'Roberto Ierusalimschy2020-04-231-1/+2
| | | | | | | The code should not compute an instruction address before checking that it exists. (Virtually no machine complains of computing an invalid address, as long as the address is not used, but for ISO C that is undefined behavior.)
* Fixed "conceptual" bug in 'luaK_setreturns'Roberto Ierusalimschy2020-03-021-1/+2
| | | | | | | | This function was computing invalid instruction addresses when the expression was not a multi-return instruction. (Virtually all machines don't raise errors when computing an invalid address, as long as the address is not accessed, but this computation is undefined behavior in ISO C.)
* Fixed a warning and other minor issuesRoberto Ierusalimschy2019-10-041-2/+2
| | | | Fixed some minor issues from the feedback for 5.4-beta rc1.
* Change in the syntax of attributesRoberto Ierusalimschy2019-07-301-12/+13
| | | | | | | Attributes changed to posfixed ('x <const>', instead of '<const> x'), and "toclose" renamed to "close". Posfixed attributes seem to make it clearer that it applies to only one variable when there are multiple variables.
* Bug: 'Vardesc' array can be reallocated in 'localstat'Roberto Ierusalimschy2019-07-261-12/+15
| | | | | A reference to a 'Vardesc*' (as done by 'localstat') can be invalidated by the creation of any new variable.
* Small corrections when setting 'L->top'Roberto Ierusalimschy2019-07-251-1/+2
| | | | | | | | | - OP_NEWTABLE can use 'ra + 1' to set top (instead of ci->top); - OP_CLOSE doesn't need to set top ('Protect' already does that); - OP_TFORCALL must use 'ProtectNT', to preserve the top already set. (That was a small bug, because iterators could be called with extra parameters besides the state and the control variable.) - Comments and an extra test for the bug in previous item.
* New kind of expression VKSTRRoberto Ierusalimschy2019-07-171-6/+8
| | | | | | | String literal expressions have their own kind VKSTR, instead of the generic VK. This allows strings to "cross" functions without entering their constant tables (e.g., if they are used only by some nested function).
* Unification of size representation in OP_NEWTABLE and OP_SETLISTRoberto Ierusalimschy2019-07-151-22/+7
| | | | | | Opcodes OP_NEWTABLE and OP_SETLIST use the same representation to store the size of the array part of a table. This new representation can go up to 2^33 (8 + 25 bits).
* OP_NEWTABLE keeps exact size of arraysRoberto Ierusalimschy2019-07-121-11/+26
| | | | | | OP_NEWTABLE is followed by an OP_EXTRAARG, so that it can keep the exact size of the array part of the table to be created. (Functions 'luaO_int2fb'/'luaO_fb2int' were removed.)
* First implementation of constant propagationRoberto Ierusalimschy2019-07-121-49/+64
| | | | | Local constant variables initialized with compile-time constants are optimized away from the code.
* DetailsRoberto Ierusalimschy2019-07-101-7/+6
| | | | | | | | In the generic for loop, it is simpler for OP_TFORLOOP to use the same 'ra' as OP_TFORCALL. Moreover, the internal names of the loop temporaries "(for ...)" don't need to leak internal details (even because the numerical for loop doesn't have a fixed role for each of its temporaries).
* Towards constant propagationRoberto Ierusalimschy2019-07-101-37/+76
| | | | | | | This commit detaches the number of active variables from the number of variables in the stack, during compilation. Soon, compile-time constants will be propagated and therefore will not exist during run time (in the stack).
* New implementation for constantsRoberto Ierusalimschy2019-07-091-72/+86
| | | | | | | | | VLOCAL expressions keep a reference to their corresponding 'Vardesc', and 'Upvaldesc' (for upvalues) has a field 'ro' (read-only). So, it is easier to check whether a variable is read-only. The decoupling in VLOCAL between 'vidx' ('Vardesc' index) and 'sidx' (stack index) should also help the forthcoming implementation of compile-time constant propagation.
* Local attributes can be used in list of local variablesRoberto Ierusalimschy2019-07-031-49/+41
| | | | | | | | | | | | The syntax for local attributes ('const'/'toclose') was unified with the regular syntax for local variables, so that we can have variables with attributes in local definitions with multiple names; for instance: local <toclose> f, <const> err = io.open(fname) This new syntax does not implement constant propagation, yet. This commit also has some small improvements to the manual.
* First take on constant propagationRoberto Ierusalimschy2019-07-011-12/+22
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* Structure 'Vardesc' does not need a 'name' fieldRoberto Ierusalimschy2019-06-211-12/+13
| | | | | | Removed the field 'name' from the structure 'Vardesc', as the name of the local variable is already available in the prototype of the function, through the index 'idx'.
* DetailsRoberto Ierusalimschy2019-05-281-1/+1
| | | | | | | - new error message for "attempt to assign to const variable" - note in the manual about compatibility options - comments - small changes in 'read_line' and 'pushstr'
* First implementation for 'const' variablesRoberto Ierusalimschy2019-05-171-20/+89
| | | | | A variable can be declared const, which means it cannot be assigned to, with the syntax 'local <const> name = exp'.
* Flag for to-be-closed variables changed to '<toclose>'Roberto Ierusalimschy2019-05-091-1/+2
| | | | | | | The flag for to-be-closed variables was changed from '*toclose' to '<toclose>'. Several people found confusing the old syntax and the new one has a clear terminator, making it more flexible for future changes.
* Keep correct type for immediate operands in comparisonsRoberto Ierusalimschy2019-03-221-1/+1
| | | | | | | | | | | | When calling metamethods for things like 'a < 3.0', which generates the opcode OP_LTI, the C register tells that the operand was converted to an integer, so that it can be corrected to float when calling a metamethod. This commit also includes some other stuff: - file 'onelua.c' added to the project - opcode OP_PREPVARARG renamed to OP_VARARGPREP - comparison opcodes rewritten through macros
* New semantics for the integer 'for' loopRoberto Ierusalimschy2019-03-191-26/+16
| | | | | | | | | | | The numerical 'for' loop over integers now uses a precomputed counter to control its number of iteractions. This change eliminates several weird cases caused by overflows (wrap-around) in the control variable. (It also ensures that every integer loop halts.) Also, the special opcodes for the usual case of step==1 were removed. (The new code is already somewhat complex for the usual case, but efficient.)
* Changes in the control of C-stack overflowRoberto Ierusalimschy2018-12-271-3/+5
| | | | | | | | | | * unification of the 'nny' and 'nCcalls' counters; * external C functions ('lua_CFunction') count more "slots" in the C stack (to allow for their possible use of buffers) * added a new test script specific for C-stack overflows. (Most of those tests were already present, but concentrating them in a single script easies the task of checking whether 'LUAI_MAXCCALLS' is adequate in a system.)
* Calls cannot be tail in the scope of a to-be-closed variableRoberto Ierusalimschy2018-12-041-1/+4
| | | | | | A to-be-closed variable must be closed when a block ends, so even a 'return foo()' cannot directly returns the results of 'foo'; the function must close the scope before returning.
* DetailsRoberto Ierusalimschy2018-11-221-33/+85
| | | | comments and other janitorial work.
* To-be-closed variable in 'for' loop separated from the stateRoberto Ierusalimschy2018-11-071-11/+14
| | | | | | | | | The variable to be closed in a generic 'for' loop now is the 4th value produced in the loop initialization, instead of being the loop state (the 2nd value produced). That allows a loop to use a state with a '__toclose' metamethod but do not close it. (As an example, 'f:lines()' might use the file 'f' as a state for the loop, but it should not close the file when the loop ends.)
* New syntax for to-be-closed variablesRoberto Ierusalimschy2018-11-071-12/+13
| | | | | | | The new syntax is <local *toclose x = f()>. The mark '*' allows other attributes to be added later without the need of new keywords; it also allows better error messages. The API function was also renamed ('lua_tobeclosed' -> 'lua_toclose').
* State in generic 'for' acts as a to-be-closed variableRoberto Ierusalimschy2018-10-311-0/+1
| | | | | | | | | | | The implicit variable 'state' in a generic 'for' is marked as a to-be-closed variable, so that the state will be closed as soon as the loop ends, no matter how. Taking advantage of this new facility, the call 'io.lines(filename)' now returns the open file as a second result. Therefore, an iteraction like 'for l in io.lines(name)...' will close the file even when the loop ends with a break or an error.
* Back with optimization for 'if cond then goto'Roberto Ierusalimschy2018-10-301-19/+65
| | | | | | | | | | | | Statements like 'if cond then goto label' generate code so that the jump in the 'if' goes directly to the given label. This optimization cannot be done when the jump is backwards leaving the scope of some variable, as it cannot add the needed 'close' instruction. (The jumps were already generated by the 'if'.) This commit also added 'likely'/'unlikely' for tests for errors in the parser, and it changed the way breaks outside loops are detected. (Now they are detected like other goto's with undefined labels.)
* Big revamp in the implmentation of labels/gotosRoberto Ierusalimschy2018-10-291-124/+117
| | | | | | | | Added restriction that, when a label is created, there cannot be another label with the same name visible. That allows backward goto's to be resolved when they are read. Backward goto's get a close if they jump out of the scope of some variable; labels get a close only if previous goto to it jumps out of the scope of some upvalue.
* More uniformity in code generation for 'for' loopsRoberto Ierusalimschy2018-10-261-10/+6
| | | | | | | Added new instruction 'OP_TFORPREP' to prepare a generic for loop. Currently it is equivalent to a jump (but with a format 'iABx', similar to other for-loop preparing instructions), but soon it will be the place to create upvalues for closing loop states.
* Closing methods should not interfere with returning valuesRoberto Ierusalimschy2018-10-251-8/+7
| | | | | | | | | | | | A closing method cannot be called in its own stack slot, as there may be returning values in the stack after that slot, and the call would corrupt those values. Instead, the closing method must be copied to the top of the stack to be called. Moreover, even when a function returns no value, its return istruction still has to have its position (which will set the stack top) after the local variables, otherwise a closing method might corrupt another not-yet-called closing method.
* First "complete" implementation of to-be-closed variablesRoberto Ierusalimschy2018-10-171-1/+1
| | | | | | | Still missing: - handling of memory errors when creating upvalue (must run closing method all the same) - interaction with coroutines
* Towards "to closed" local variablesRoberto Ierusalimschy2018-10-081-4/+30
| | | | | | | | | | | | Start of the implementation of "scoped variables" or "to be closed" variables, local variables whose '__close' (or themselves) are called when they go out of scope. This commit implements the syntax, the opcode, and the creation of the corresponding upvalue, but it still does not call the finalizations when the variable goes out of scope (the most important part). Currently, the syntax is 'local scoped name = exp', but that will probably change.
* Details (comments)Roberto Ierusalimschy2018-09-111-2/+2
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* Removed extra information from RCS keyword stringsRoberto Ierusalimschy2018-08-231-1/+1
| | | | | Version numbers and dates (mostly wrong) from RCS keyword strings removed from all source files; only the file name are kept.
* in generational mode, an emergency collection can turn any object blackRoberto Ierusalimschy2018-06-181-2/+2
| | | | during any memory allocation.
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