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* New global control over float print precision.Kaz Kylheku2015-11-134-8/+99
| | | | | | | | | | | | | | | | | | * configure (have_dbl_decimal_dig): New variable. New configure test to test for DBL_DECIMAL_DIG or __DBL_DECIMAL_DIG__, resulting in FLO_MAX_DIG macro being deposited in config.h. * arith.c (arith_init): Register flo-max-dig variable. * stream.c (print_flo_precision_s): New symbol variable. (formatv): Obtain default precision from *print-flo-precision* special variable, rather than hard coded DBL_DIG. (stream_init): Initialize print_flo_precision_s variable, and register *print-flo-precision* special. * txr.1: Document flo-max-dig, *print-flo-precision*, and change of behavior in format.
* Formatting in generate, giterate heading.Kaz Kylheku2015-11-121-1/+1
| | | | * txr.1: Missing @, added for comma.
* Explanation about mlet circularity.Kaz Kylheku2015-11-121-1/+4
| | | | | * txr.1: mlet circular references are detected at evaluation time, not by the macro.
* Fix pretty printer mishandling unexpected syntax.Kaz Kylheku2015-11-111-7/+8
| | | | | | | | | * lib.c (obj_print_impl): When rendering quote, quasiquote, unquote, splice, vector literals, and meta-vars/meta-numbers into their read syntax, we must ensure that these forms have the correct abstract syntax. If not, we must print these as ordinary compound expressions. Otherwise we throw errors, or don't print the complete object.
* Consistent parameter name in list_collect_* decls.Kaz Kylheku2015-11-111-5/+5
| | | | | | | * lib.h (list_collect, list_collect_nconc, list_collect_append, list_collect_nreconc, list_collect_revappend): Rename pptail parameter to ptail, like in the lib.c definitions of these.
* Adding revappend and nreconc.Kaz Kylheku2015-11-114-0/+143
| | | | | | | | | | | | | | | * eval.c (eval_init): Register revappend and nreconc intrinsics. * lib.c (list_collect_nreconc): New function. (revlist): New static function. (list_collect_revappend): New function. (revappend, nreconc): New functions. * lib.h (revappend, nreconc): Declared. (list_collect_nreconc, list_collect_revappend): Declared. * txr.1: Documented revappend and nreconc.
* Improve reverse and nreverse.Kaz Kylheku2015-11-111-16/+68
| | | | | | | | * lib.c (nreverse): Handle strings and vectors individually, and do strings and vectors in-place. (reverse): Handle strings and vectors individually, by duplicating and then in place. Handle lazy strings by forcing, then reversing a copy.
* Print (rcons x y) forms as x..y.Kaz Kylheku2015-11-101-0/+6
| | | | | * lib.c (obj_print_impl): Handle rcons in same place as other special syntax like sys:expr and quote.
* New function: group-reduce.Kaz Kylheku2015-11-104-0/+120
| | | | | | | | | | * eval.c (eval_init): Register group-reduce intrinsic. * hash.c (group_reduce): New function. * hash.h (group_reduce): Declared. * txr.1: Documented group-reduce.
* Add func_n6o.Kaz Kylheku2015-11-102-0/+7
| | | | | | * lib.c (func_n6o): New function. * lib.h (func_n6o): Declared.
* New block* op; functions return* and sys:abscond*.Kaz Kylheku2015-11-092-4/+127
| | | | | | | | | | | | * eval.c (block_star_s): New symbol variable. (op_block_star): New static function. (do_expand): Handle block* symbol. (return_star, abscond_star): New static functions. (eval_init): Initialize block_star_s variable. Register block* operator and return* and sys:abscond* functions. * txr.1: Documented new operator and functions.
* Variable init forms of for go inside nil block.Kaz Kylheku2015-11-082-9/+21
| | | | | | | | * eval.c (op_for): Establish the block before doing any evaluation, subject to the compatibility option. * txr.1: Updated documentation for for, exchanging steps 1 and 2. Added compatibility notes.
* quicksort: tail recurse on longer partition.Kaz Kylheku2015-11-081-3/+8
| | | | | | * lib.c (quicksort): Sort the shorter partition with real recursion, then tail recurse with explicit goto to sort the longer partition.
* Median of three pivot selection in quicksort.Kaz Kylheku2015-11-081-3/+49
| | | | | | * lib.c (med_of_three, middle_pivot): New static functions. (quicksort): Use med_of_three to choose a pivot above a threshold array size, otherwise just the middle element.
* New iread function.Kaz Kylheku2015-11-076-10/+120
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The read function no longer works like it used to on an interactive terminal because of the support for .. and . syntax on a top-level expression. The iread function is provided which uses a modified syntax that doesn't support these operators on a top-level expression. The parser thus doesn't look one token ahead, and so iread can return immediately. * eval.c (eval_init): Register iread intrinsic function. * parser.c (prime_parser): Only push back the recently seen token when priming for a regular Lisp read. Handle the prime_interactive method by preparing a SECRET_ESCAPE_I token. (lisp_parse_impl): New static function, formed from previous lisp_parse. Takes a boolean argument indicating interactive mode. (prime_parser_post): New function. (lisp_parse): Now a wrapper for lisp_parse_impl which passes a nil to indicate noninteractive read. (iread): New function. * parser.h (enum prime_parser): New member, prime_interactive. (scrub_scanner, iread, prime_parser_post): Declared. * parser.l (prime_scanner): Handle the prime_interactive case the same way as prime_lisp. (scrub_scanner): New function. * parser.y (SECRET_ESCAPE_I): New token type. (i_expr): New nonterminal symbol. Like n_expr, but doesn't support dot or dotdot operators, except in nested subexpressions. (spec): Handle SECRET_ESCAPE_I by way of i_expr. (sym_helper): Before freeing the token lexeme, call scrub_scanner. If the token is registered as the scanner's most recently seen token, the scanner must forget that registration, because it is no longer valid. (parse): Call prime_parser_post. * txr.1: Documented iread.
* Version 123.txr-123Kaz Kylheku2015-11-064-4/+15
| | | | | | | | * RELNOTES: Updated. * configure, txr.1: Bumped version and date. * share/txr/stdlib/ver.tl: Likewise.
* Remove unused rel1 function.Kaz Kylheku2015-11-062-8/+0
| | | | | | * gc.c (rel1): Removed. * gc.h (rel1): Declaration removed.
* Fix serious regression in search_regex.Kaz Kylheku2015-11-061-3/+1
| | | | | | | | * regex.c (search_regex): In the Sep 7 2015 commit titled "Don't use prot1 for temporary gc protection", a rel1 call was left behind, causing an assert whenever the function is used for a succesful "from end" search.
* Version 122.txr-122Kaz Kylheku2015-11-056-338/+371
| | | | | | | | | | * RELNOTES: Updated. * configure, txr.1: Bumped version and date. * share/txr/stdlib/ver.tl: Likewise. * txr.vim, tl.vim: Regenerated.
* Make small_sigset_t narrower.Kaz Kylheku2015-11-052-2/+2
| | | | | | | | | On 64 bit Darwin, sigset_t is 32 bits, sso our small_sigset_t is actually larger. Let's use unsigned int. * signal.h (small_sigset_t): Use unsignd int for set member. * signal.c (small_sigfillset): Change cast to unsigned int.
* Clear stack area below revived continuation.Kaz Kylheku2015-11-051-0/+1
| | | | | | | | | | | * unwind.c (revive_cont): Don't just reserve frame_slack bytes below the continuation for any stack frame, but clear the bytes to zero. On Cygwin, this fixes a failing continuation test case. The issue is that the cont_obj variable in capture_cont lands into this area (implying it is not captured). When the continuation is revived, the variable has a garbage value, rather than nil, as expected.
* Copy envs for middle-of-binding continuations.Kaz Kylheku2015-11-054-16/+108
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When continuations are captured/restored in the middle of variable binding constructs, a hidden problem occurs. Binding constructs work by allocating an empty environment and then destructively extending it. Since the environment is not on the stack, but a referenced object, it doesn't get deep copied into a continuation. As the continuation is revived repeatedly, parts of the variable binding code are repeatedly re-executed, and keep pushing fresh bindings into the same environment object. Though the new bindings correctly shadow the old, the old bindings are there and potentially hang on to garbage. The solution taken here is to introduce a new kind of frame for handling the situation: a continuation copy handling frame. This frame allows functions to register objects to be copied more deeply if a continuation is captured/revived across them. * eval.c (copy_env): New static function. (copy_env_handler): New static function. (bind_args, bind_macro_params): Install continuation copy handling frame for cloning new_env. (struct bindings_helper_vars): New struct type. (copy_bh_env_handler): New static function. (bindings_helper): Install continuation copy handling frame for de and ne variables which hold environments. The variables are moved to a struct to facilitate access from the handler. * eval.h (copy_env): Declared. * unwind.c (uw_push_cont_copy): New function. (call_copy_handler): New static function. (revive_cont): When a continuation is being revived invoke the copying actions in its continuation copy handling frames, but not if it is only being temporarily revived for immediate unwinding. (capture_cont): After copying the continuation, invoke any continuation copying frames in the "parent": the original frames that were captured. * unwind.h (enum uw_frtype): New type, UW_CONT_COPY. (struct uw_cont_copy): New struct type. (union uw_frame): New member cp. (uw_push_cont_copy): Declared.
* yield-from can omit form; access initial value.Kaz Kylheku2015-11-042-72/+122
| | | | | | | | | | | | | * share/txr/stdlib/yield.tl (sys:rcv-item): New struct type. (sys:obtain-impl): Handle rcv-item, produced by a no-argument yield-from, which requests an immediate resumption with the previously given resume value. The reply value is renamed the resume value. (yield-from, yield): Form argument is optional. * txr.1: Rewrote obtain and yield documentation with lesser focus on implementation and greater focus on abstract semantics.
* Pattern vars accessed from Lisp now dynamic.Kaz Kylheku2015-11-044-5/+73
| | | | | | | | | | | | | | | * eval.c (set_dyn_env): Static function becomes external. * eval.h (set_dyn_env): Declared. * match.c (eval_with_bindings, eval_progn_with_bindings): Evaluate Lisp code in null lexical environment. Instead install the pattern variables as dynamic, so they shadow global variables. A compatibility check for 121 or earlier provides the old behavior. * txr.1: Document scoping rules, and added compatibility notes.
* Factor out excessive uw_set_match_context calls.Kaz Kylheku2015-11-031-51/+40
| | | | | | | | | | | | | | | | | | | | | | | | | | We only need to stash the TXR matcher's context in an environment frame when there is the possibility that Lisp code may be called, or filters which re-enter the matcher directly or through Lisp code. * match.c (eval_with_bindings, eval_progn_with_bindings): New static functions. (dest_bind): Use eval_with_bindings instead of five lines of boilerplate code. (h_chr): No need to stash context around dest_bind; lower levels take care of it. (subst_vars): Do set up match context around the body of this function, for the sake of Lisp calls and filtering in format_field. Use eval_with_bindings. (do_txeval): Remove match context environment frame setup around subst_vars. Use eval_with_bindings, too. (do_output_line): Use eval_with_bindings. (v_output): No match context environment frame around do_output. (v_do, v_require): Use eval_progn_with_bindings instead of five line boilerplate. (v_line): No match context frame around dest_bind. (h_do): Use eval_progn_with_bindings.
* Add amb test case for continuations.Kaz Kylheku2015-11-021-0/+20
| | | | | | * tests/012/cont.tl (amb-scope): New macro. (amb): New function. New test case using amb.
* Moving sys:capture-cont to call/cc style API.Kaz Kylheku2015-11-024-59/+50
| | | | | | | | | | | | | | | | | | | | | | | | | | | | * unwind.c (revive_cont): Don't wrap cons cell around passed arg; just pass it directly. We don't need that convention any more. * capture_cont: Take functional argument. Pass the captured continuation to the function. If the function returns, return whatever it returned. When resuming, return the continuation argument. (uw_capture_cont): Take functional second argument and pass to capture_cont. Context form becomes third argument. (uw_late_init): Update registration of sys:capture-cont to three arguments, two required. * unwind.h (uw_capture_cont): Declaration updated. * share/txr/stdlib/yield.tl (sys:yield-impl): Not needed any more; all this was doing was implementing a call/cc style interface around sys:capture-cont which can now be used directly. (yield-from): Use sys:capture-cont directly. (suspend): Simplified to the point of triviality with new sys:capture-cont. * txr.1: Documented.
* New range type, distinct from cons cell.Kaz Kylheku2015-11-0110-43/+253
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * eval.c (eval_init): Register intrinsic functions rcons, rangep from and to. (eval_init): Register rangep intrinsic. * gc.c (mark_obj): Traverse RNG objects. (finalize): Handle RNG in switch. * hash.c (equal_hash, eql_hash): Hashing for for RNG objects. * lib.c (range_s, rcons_s): New symbol variables. (code2type): Handle RNG type. (eql, equal): Equality for ranges. (less_tab_init): Table extended to cover RNG. (less): Semantics defined for ranges. (rcons, rangep, from, to): New functions. (obj_init): range_s and rcons_s variables initialized. (obj_print_impl): Produce #R notation for ranges. (generic_funcall, dwim_set): Recognize range objects for indexing * lib.h (enum type): New enum member, RNG. MAXTYPE redefined to RNG value. (TYPE_SHIFT): Increased to 5 since there are now 16 type codes. (struct range): New struct type. (union obj): New member rn, of type struct range. (range_s, rcons_s, rcons, rangep, from, to): Declared. (range_bind): New macro. * parser.l (grammar): New rule for recognizing the #R sequence as HASH_R token. * parser.y (HASH_R): New terminal symbol. (range): New nonterminal symbol. (n_expr): Derives the new range symbol. The n_expr DOTDOT n_expr rule produces rcons expression rather than const. * match.c (format_field): Recognize rcons syntax in fields which is now what ranges translate to. Also recognize range object. * tests/013/maze.tl (neigh): Fix code which destructures range as a cons. That can't be done any more. * txr.1: Document ranges.
* Fix case in Compatibility section reference.Kaz Kylheku2015-10-311-1/+1
| | | | * txr.1: Compatibility -> COMPATIBILITY
* Define suspend operator.Kaz Kylheku2015-10-303-35/+104
| | | | | | | | | | * lisplib.c (yield_set_entries): Added "suspend" to end of name. * share/txr/stdlib/yield.tl (suspend): New macro. * txr.1: Documented suspend. Replaced subtly incorect shift/reset implementation example with suspend implementation.
* Support Power PC 64.Kaz Kylheku2015-10-302-0/+88
| | | | | | * jmp.S (jmp_save, jmp_restore): Add PPC64 versions. * signal.h (struct jmp): Add PPC64 version.
* Version 121.txr-121Kaz Kylheku2015-10-296-534/+568
| | | | | | | | | | * RELNOTES: Updated. * configure, txr.1: Bumped version and date. * share/txr/stdlib/ver.tl: Likewise. * txr.vim, tl.vim: Regenerated.
* Formatting issue under qref.Kaz Kylheku2015-10-291-1/+1
| | | | * txr.1: Improperly terminated .cblk.
* Provide a way to free the continuation stacks.Kaz Kylheku2015-10-293-42/+66
| | | | | | | | | | | | | | | | | | * share/txr/stdlib/yield.tl (sys:obtain-impl): Pass sys:cont-free symbol to each abandoned continuation to release its stack buffer. (obtain): Handle the sys:cont-free symbol in the lambda, so the initial lambda can be treated uniformly with continuation functions. * txr.1: Documented sys:obtain-impl. * unwind.c (sys_cont_free_s): New symbol variable. (cont_mark): Check for null stack pointer and avoid marking. (revive_cont): If arg is sys:cont-free, then free the continuation and return nil. If the continuation has a null stack buffer, throw an error. (uw_late_init): Initialize sys_cont_free_s.
* Finalize obtain continuator function.Kaz Kylheku2015-10-292-7/+20
| | | | | | | | | | * share/txr/stdlib/yield.tl (sys:obtain-impl): Add a finalizer to the returned closure which will feed sys:cont-poison object to the most recently captured continuation. Thus abandoned obtain blocks which have become garbage shall have their unwinding performed. * txr.1: Documented the finalization behavior.
* Unwinding continuations via "poison" value.Kaz Kylheku2015-10-292-2/+11
| | | | | | | | | | | | * unwind.c (sys_cont_poison_s): New symbol variable. (revive_cont): If the argument is the poison symbol, then unwind through the continuation all the way back to revive_cont's own block, instead of to the continuation's very top block. Thus the continuation is not restarted but completely unwound. (uw_late_init): Initialize sys_cont_poison_s. * txr.1: Documented sys:cont-poison.
* Implementing sys:abscond-from operator.Kaz Kylheku2015-10-285-5/+121
| | | | | | | | | | | | | | | | | | | | | * eval.c (sys_abscond_from_s): New symbol variable. (op_abscond_from): New static function. (do_expand): Handle abscond-from like return-from. (eval_init): Initialize sys_abscond_from_s and register sys:abscond-from operator. * share/txr/stdlib/yield.tl (yield-from): Use sys:abscond-from instead of return-from, to avoid tearing down the continuation's resources that it may need when restarted. * txr.1: Documented sys:abscond-from and added a mention to the Delimited Continuations introduction. * unwind.c (uw_abscond_to_exit_point): New static function. (uw_block_abscond): New function. * unwind.h (uw_block_abscond): Declared.
* Doc maintenance under flet and labels.Kaz Kylheku2015-10-281-1/+15
| | | | | | * txr.1: Some wording changes and dialect note that flet and labels do not genearate implict named blocks in the function bodies.
* Bugfix: harden hash-next, since it is exposed.Kaz Kylheku2015-10-281-1/+4
| | | | | | | | | | | The C code doesn't call hash_next once it returns nil, so it doesn't matter that doing so will dereference a null pointer. But hash_next is now exposed as the Lisp function hash-next. * hash.c (hash_next): If the hash table in the iterator is nil, then return nil, avoiding the dereference of a null pointer.
* Fix with-hash-table-iter typo.Kaz Kylheku2015-10-282-2/+2
| | | | | | | * lisplib.c (hash_set_entries): Change with-hash-table-iter to with-hash-iter. * txr.1: Likewise.
* Add some tests for continuations.Kaz Kylheku2015-10-282-0/+19
| | | | | | * tests/012/cont.tl: New file. * tests/012/cont.expected: New file.
* Add obtain/yield macros interface to continuations.Kaz Kylheku2015-10-283-0/+328
| | | | | | | | | | | * lisplib.c (yield_set_entries, yield_instantiate): New static functions. (dlt_register): Registered new functions. * share/txr/stdlib/yield.tl: New file. * txr.1: Documented obtain, yield-from, obtain-block and yield.
* Context form error reporting in sys:capture-cont.Kaz Kylheku2015-10-283-18/+24
| | | | | | | | | | | | | | * unwind.c (sys_capture_cont_s): New variable. (uw_capture_cont): Second argument is now a context form rather than a symbol; eval_error is used for error reporting. The form's operator symbol si used in the error message, or else sys:capture-cont if the context argument is null or missing. (uw_late_init): Initialize sys_capture_cont_s. * unwind.h (uw_capture_cont): Declaration updated. * txr.1: Documented.
* Expose eval_error out of eval module.Kaz Kylheku2015-10-282-1/+2
| | | | | | * eval.c (eval_error): Static function made external. * eval.h (eval_error): Declared.
* Move noreturn macro.Kaz Kylheku2015-10-282-6/+6
| | | | | | * lib.h (noreturn): Defined here. * unwind.h (noreturn): Removed from here.
* New special macro parameter list parameter :form.Kaz Kylheku2015-10-282-12/+30
| | | | | | | | * eval.c (form_k): New keyword symbol variable. (bind_macro_params): Implement form_k. (eval_init): Initialize form_k. * txr.1: Documented :form parameter.
* Improvement in place macros.Kaz Kylheku2015-10-282-13/+40
| | | | | | | | | | | Expansion of places now gives priority to place macros. Moreover, it iterates over place macro and ordinary macro expansion. * share/txr/stdlib/place.tl (sys:trigger-load): Removed. (sys:pl-expand): Rewritten. * txr.1: Documented.
* Remove no-longer-needed bulk bit operations.Kaz Kylheku2015-10-271-17/+3
| | | | | | | * signal.c (mem_set_bits, mem_clr_bits): Static functions removed. (sig_mask): Operate on set member of small_sigset_t directly rather than as an array of bytes.
* Fix C++ clash in slots implementation.Kaz Kylheku2015-10-271-2/+2
| | | | | * struct.c (make_struct_type): Don't use nullptr identifier as variable name.
* Reduce size of saved/restored signal masks.Kaz Kylheku2015-10-272-23/+31
| | | | | | | | | | | | | | | | | | | | | | | | | On glibc, sigset_t has a ridiculous size: one kilobyte! The kernel doesn't access most of it in the sigprocmask call. Yet it blows up the size of our dynamic frames quite a lot. In this commit, we define a small_sigset_t type and use that instead. We convert to the bloated one when calling the library. * signal.c (sig_blocked_cache): Type changes to small_sigset_t. (sig_reload_cache): Retrieve signal mask with sigprocmask into a local variable, then copy a small portion from that to sig_blocked_cache. (small_sigfillset): New static function. (set_sig_handler): Local variables of sigset_t changed to small_sigset_t. (sig_mask): Arguments are pointers to small_sigset_t. Conversion to sigset_t done around the call to sigprocmask. * signal.h (copy_sigset): Inline funtion removed. (small_sigset_t): New struct type. (extended_jmp_buf): Member blocked changed to small_sigset_t. (extended_setjmp): Cast expression updated with small_sigset_t *. (extended_longjmp): Use assignment instead of copy_sigset. (sig_blocked_cache, sig_mask): Declarations updated.
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