| Commit message (Collapse) | Author | Age | Files | Lines |
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GC. The issue being solved here is the accuracy of the gc_set function.
The existing impelmentation is too conservative. It has no generation
information about the memory location being stored, and so it assumes
the worst: that it is a location in the middle of a gen 1 object.
This is sub-optimal, creating unacceptable pressure against the
checkobj array and, worse, as a consequence causing unreachable gen 0
objects to be tenured into gen 1.
To solve this problem, we replace "val *" pointers with a structure
of type "loc" which keeps track of the object too, which lets us
discover the generation.
I tried another approach: using just a pointer with a bitfield
indicating the generation. This turned out to have a serious issue:
such a bitfield goes stale when the object is moved to a different
generation. The object holding the memory location is in gen 1, but the
annotated pointer still indicates gen 0. The gc_set function then
makes the wrong decision, and premature reclamation takes place.
* combi.c (perm_init_common, comb_gen_fun_common,
rcomb_gen_fun_common, rcomb_list_gen_fun): Update to new interfaces
for managing mutation.
* debug.c (debug): Update to new interfaces for managing mutation.
Avoid loc variable name.
* eval.c (env_fbind, env_fbind): Update to new interfaces
for managing mutation.
(lookup_var_l, dwim_loc): Return loc type and update to new interfaces.
(apply_frob_args, op_modplace, op_dohash, transform_op, mapcarv,
mappendv, repeat_infinite_func, repeat_times_func): Update to new
interfaces for managing mutation.
* eval.h (lookup_var_l): Declaration updated.
* filter.c (trie_add, trie_compress, trie_compress_intrinsic,
* build_filter, built_filter_from_list, filter_init): Update to new
* interfaces.
* gc.c (gc_set): Rewritten to use loc type which provides the exact
generation. We do not need the in_malloc_range hack any more, since
we have the backpointer to the object.
(gc_push): Take loc rather than raw pointer.
* gc.h (gc_set, gc_push): Declarations updated.
* hash.c (struct hash): The acons* functions use loc instead
of val * now.
(hash_equal_op, copy_hash, gethash_c, inhash, gethash_n, pushhash,
Change to how locations are passed around, for the sake of generational
GC. The issue being solved here is the accuracy of the gc_set function.
The existing impelmentation is too conservative. It has no generation
information about the memory location being stored, and so it assumes
the worst: that it is a location in the middle of a gen 1 object.
This is sub-optimal, creating unacceptable pressure against the
checkobj array and, worse, as a consequence causing unreachable gen 0
objects to be tenured into gen 1.
To solve this problem, we replace "val *" pointers with a structure
of type "loc" which keeps track of the object too, which lets us
discover the generation.
I tried another approach: using just a pointer with a bitfield
indicating the generation. This turned out to have a serious issue:
such a bitfield goes stale when the object is moved to a different
generation. The object holding the memory location is in gen 1, but the
annotated pointer still indicates gen 0. The gc_set function then
makes the wrong decision, and premature reclamation takes place.
* combi.c (perm_init_common, comb_gen_fun_common,
rcomb_gen_fun_common, rcomb_list_gen_fun): Update to new interfaces
for managing mutation.
* debug.c (debug): Update to new interfaces for managing mutation.
Avoid loc variable name.
* eval.c (env_fbind, env_fbind): Update to new interfaces
for managing mutation.
(lookup_var_l, dwim_loc): Return loc type and update to new interfaces.
(apply_frob_args, op_modplace, op_dohash, transform_op, mapcarv,
mappendv, repeat_infinite_func, repeat_times_func): Update to new
interfaces for managing mutation.
* eval.h (lookup_var_l): Declaration updated.
* filter.c (trie_add, trie_compress, trie_compress_intrinsic,
* build_filter, built_filter_from_list, filter_init): Update to new
* interfaces.
* gc.c (gc_set): Rewritten to use loc type which provides the exact
generation. We do not need the in_malloc_range hack any more, since
we have the backpointer to the object.
(gc_push): Take loc rather than raw pointer.
* gc.h (gc_set, gc_push): Declarations updated.
* hash.c (struct hash): The acons* functions use loc instead
of val * now.
(hash_equal_op, copy_hash, gethash_c, inhash, gethash_n, pushhash,
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(obj_init): Intern assert symbol, store in assert_s.
* lib.h (assert_s): Declared.
* match.c (typed_error, v_assert, h_assert): New static functions.
(dir_tables_init): Register v_assert and h_assert.
Register assert_s as non-data-matching directive.
* unwind.c (uw_init): Register assert as a subtype
of error.
* txr.1: Describe assert.
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alleviate a long-standing pain: when an exception happens in
TXR's library somewhere, the program dies without leaving
a clue about what code was being evaluated when that happened.
What we can do is have the evaluator publish the most recent
compound form it has processed by stashing it in a variable.
Then when an unhandled exception occurs, we can peek at that
and try to pull out source location info.
* eval.c (last_form_evaled): New variable.
(do_eval): When evaluating a compound form, stash it in
last_form_evaled.
(eval_init): Protect last_form_evaled from gc.
* eval.h (last_form_evaled): Declared.
(eval_error_s): Existing variable declared.
* unwind.c: Has to include "eval.h" for the above variable
and "parser.h" for the source_loc function.
(uw_throw): When an exception is unhandled, if
last_form_evaled has source info, add it to the diagnostic.
But not if the exception is eval-error; because errors from
the evaluators already have the info.
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* Makefile (OBJS-y): Include signal.o if have_posix_sigs is "y".
* configure (have_posix_sigs): New variable, set by detecting POSIX
signal stuff.
* dep.mk: Regenerated.
* arith.c, debug.c, eval.c, filter.c, hash.c, match.c, parser.y,
parser.l, rand.c, regex.c, syslog.c, txr.c, utf8.c: Include new
signal.h header, now required by unwind, and the <signal.h> system
header.
* eval.c (exit_wrap): New function.
(eval_init): New functions registered as intrinsics: exit_wrap,
set_sig_handler, get_sig_handler, sig_check.
* gc.c (release): Unused functions removed.
* gc.h (release): Declaration removed.
* lib.c (init): Call sig_init.
* stream.c (set_putc, se_getc, se_fflush): New static functions.
(stdio_put_char_callback, stdio_get_char_callback, stdio_put_byte,
stdio_flush, stdio_get_byte): Use new functions to enable
signals when blocked on I/O.
(tail_strategy): Allow signals across sleep.
(pipev_close): Allow signals across waitpid.
(se_pclose): New static function.
(pipe_close): Use new function to enable signals across pclose.
* unwind.c (uw_unwind_to_exit_point): use extended_longjmp instead of
longjmp.
* unwind.h (struct uw_block, struct uw_catch): jb member changes from
jmp_buf to extended_jmp_buf.
(uw_block_begin, uw_simple_catch_begin, uw_catch_begin): Use
extended_setjmp instead of setjmp.
* signal.c: New file.
* signal.h: New file.
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Fixing some errors in copyright comments.
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deviations from C90, like mixed declations and
statements. GCC doesn't diagnose these without the
--pedantic flag.
* configure: GCC's --ansi flag should be spelled -ansi.
* lib.c (split_str, obj_print): Reorder declaration before statements.
(make_sym): Fix similar problem by eliminating a statement.
(funcall1, funcall2, funcall3, funcall4): Use assignment to initialize
local array with non-constant elements. This is actually good for
performance because we only initialize those parts of the array that
we use.
* lib.h (struct func): Change functype member to unsigned,
since enum-typed bitfields are a GCC extension.
* match.c (ml_all, mf_all): Use assignments to initialize local
struct with non-constants.
(do_txeval, v_collect): Slightly revise unwinding macrology with help
of new macros to avoid mixing declarations and statements.
(spec_bind): Removed spurious semicolon from macro expansion.
(v_gather): Reorder two lines to avoid mixed decls and
statements.
(match_filter): Move declaration of ret a few lines up, ahead of
statements.
* unwind.c (uw_pop_until): New function.
* unwind.h (uw_pop_until): Declared.
(uw_mark_frame, uw_fast_return): New macros.
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* gc.c (gc_mutated): Return the value.
* gc.h (gc_mutated): Declaration updated.
* hash.c (remhash): Fix unsafe assignment to use set macro.
* lib.c (sort): Fix wrong use of mut macro on the list
before it is sorted rather than after.
* lib.h (mut): Trivial version of macro updated to return argument.
* unwind.c (uw_init): The toplevel environment's match_context
should be gc_protected. Though this is probably not used,
which is why it has not been a problem.
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causes CONFIG_GEN_GC to be defined as 1 in config.h.
* eval.c (op_defvar, dwim_loc, op_modplace, transform_op): Handle
mutating assignments via set macro.
(op_dohash): Inform gc about mutated variables. TODO here.
* filter.c (trie_add, trie_compress): Handle mutating assignments
via set macro.
* gc.c (BACKPTR_VEC_SIZE, FULL_GC_INTERVAL): New preprocessor symbols.
(backptr, backptr_idx, partial_gc_count, full): New static variables.
(make_obj): Initialize generation to zero.
(gc): Added logic for deciding between full and partial gc.
(gc_set, gc_mutated): New functions.
* gc.h (gc_set, gc_mutated): Declared.
* hash.c (hash_mark): Changed useless use of vecref_l to vecref.
(gethash_f): Use set when assigning through *found since it
is a possible mutation.
* lib.c (car_l, cdr_l, vecref_l): Got rid of loc macro uses. Using the
value properly is going to be the caller's responsibility.
(push): push may be a mutation, so use set.
(intern): Uset set to mutate a hash entry.
(acons_new_l, aconsq_new_l): Use set when replacing *list.
* lib.h (PTR_BIT): New preprocessor symbol.
(obj_common): New macro for defining common object fields.
type_t is split into two bitfields, half a pointer wide,
allowing for generation to be represented.
(struct any, struct cons, struct string, struct sym, struct package,
struct func, struct vec, struct lazy_cons, struct cobj, struct env,
struct bignum, struct flonum): Use obj_common macro to defined
common fields.
(loc): Macro removed.
(set, mut): Macros conditionally defined for real functionality.
(list_collect, list_collect_nconc, list_collect_append): Replace
mutating operations with set.
* match.c (dest_set, v_cat, v_output, v_filter): Replace
mutating operations with set.
* stream.c (string_in_get_line, string_in_get_char,
strlist_out_put_string, strlist_out_put_char): Replace mutating
operations with set.
* unwind.c (uw_register_subtype): Replace mutating operation with set.
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happen to request a successful termination by invoking @(accept)
the position must not advance into the trailer material.
* match.c (v_trailer): Added an unwind protect which
detects that an accept is taking place and adjusts the return value to
restrict the input position at the point given to trailer.
(accept_fail): Use uw_block_return_proto instead of uw_block_return
and pass the symbol as the protocol identifier.
* unwind.c (uw_current_exit_point): New function.
(uw_block_return): Function renamed to uw_block_return_proto;
takes new parameter which is stored in the block structure.
* unwind.h (struct uw_block): New member, protocol.
(uw_block_return): Becomes an inline wrapper for uw_block_return_proto.
(uw_block_return_proto, uw_current_exit_point): Declared.
* txr.1: Interaction between @(trailer) and @(accept) documented.
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* arith.h: Likewise.
* debug.c: Added copyright header.
* debug.h: Updated copyright year.
* eval.c: Likewise.
* eval.h: Likewise.
* filter.c: Likewise.
* filter.h: Likewise.
* gc.c: Likewise.
* gc.h: Likewise.
* hash.c: Likewise.
* hash.h: Likewise.
* lib.c: Likewise.
* lib.h: Likewise.
* match.c: Likewise.
* match.h: Likewise.
* parser.h: Likewise.
* regex.c: Likewise.
* regex.h: Likewise.
* stream.c: Likewise.
* stream.h: Likewise.
* txr.c: Likewise, and e-mail address.
* txr.h: Updated copyright year.
* unwind.c: Likewise.
* unwind.h: Likewise.
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* debug.c (help, show_bindings): put_string arguments reversed.
* eval.c (bind_args): Support colon notation in interpreted
function lambda lists for optional arguments. Improved error checking.
(apply): Allow optional arguments to be left out.
(dwim_loc): Reversed arguments to replace_str, replace_vec,
replace_list.
(eval_init): Numerous intrinsics now have arguments that are optional.
New function rand introduced which reverses arguments relative to
random. New intrinsic function hash introduced for alternative
construction of hashes.
* gc.c (sweep): Reversed arguments to put_char.
* hash.c (weak_keys_k, weak_vals_k, equal_based_k): New keyword
symbol variables.
(hashv): New function.
(hash_init): Intern new symbols.
* hash.h (weak_keys_k, weak_vals_k, equal_based_k, hashv): Declared.
* lib.c (colon_k): New keyword symbol variable.
(replace_list, replace_str, replace_vec): Arguments rearranged.
(tree_find): testfun becomes optional argument.
(int_str): base becomes optional argument.
(func_f0, func_f1, func_f2, func_f3, func_f4, func_n0,
func_n1, func_n2, func_n3, func_n4, func_f0v, func_f1v,
func_f2v, func_f3v, func_f4v, func_n0v, func_n1v,
func_n2v, func_n3v, func_n4v, func_interp): Initialize optargs to zero.
(func_n0o, func_n1o, func_n2o, func_n3o, func_n4o): New functions.
(cobj_print_op): Reversed arguments to put_string.
(find): testfun and keyfun become optional arguments.
(replace): Parameters rearranged and arguments rearranged in calls to
replace_list, replace_str and replace_vec.
(obj_init): colon_k initialized.
(obj_print, obj_pprint): Arguments reversed, and stream defaults
to std_output. Arguments reversed in calls to put_char and put_string.
(dump): Arguments reversed in call to put_char.
* lib.h (struct func): sizes of minparam, fixparam bitfields
adjusted. New bitfield optargs. New unnamed bitfield added so
the previous ones add up to 16 bits.
(colon_k): Declared.
(func_n0o, func_n1o, func_n2o, func_n3o, func_n4o): Declared.
(replace_list, replace_str, replace_vec, replace): Declarations updated.
* match.c (debuglf, dump_shell_string, dump_byte_string, dump_var,
do_output_line, extract): Reversed arguments to put_char and
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* eval.c (op_catch, expand_catch_clause,
expand_catch): New static functions.
(expand): Handle catch operator.
(eval_init): Added catch operator to op_table,
and registered new functions throw, throwf and error.
* txr.1: Documented catch operator and created
stub section for throw, throwf and error.
* txr.vim: Updated.
* unwind.c (uw_throwfv, uw_errorfv): New functions.
* unwind.h (uw_throwfv, uw_errorfv): Declared.
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a large file horizontally under @(freeform) in constant memory.
Position reporting is incorrect.
* match.c (match_line_ctx): New member, base.
(ml_all): Initialize new member to zero.
(consume_prefix): New static function.
(do_match_line): New static function, contains implementation of
match_line. Calls consume_prefix.
(match_line): Becomes a wrapper for do_match_line.
(search_form, h_skip): Call consume_prefix.
(freeform_prepare): New function. External to avoid inlining.
(v_freeform): Uses do_match_line, to down context by reference,
and also refactored to avoid spurious retention of c->data.
* unwind.c (uw_push-block, uw_push_env, uw_push_debug,
uw_push_catch): Zero out the structure, otherwise the unused
fields can cause spurious retention.
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(debug): In backtrace, show the renaming pairs for unbound
variables (up_p_a_pairs) if they are present.
* debug.h (debug_begin): Renamed to debug_frame.
* eval.c (eval): Wrap debug_begin/debug_end around function dispatch,
so TXR Lisp functions are included in backtraces.
* match.c (h_fun): Follow rename of debug_begin to debug_frame.
Pass in evaluated args, not the original ones.
(v_fun): Likewise.
* unwind.c (uw_push_debug): bindings argument renamed to env.
Bugfix: args argument was being assigned to ub_p_a_pairs.
* unwind.h (struct uw_debug): Member bindings renamed to env.
(uw_push_debug): Declaration updated.
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* unwind.c (uw_unwind_to_exit_point): When jumping to a catch frame,
do not mark it invisible.
* unwind.h (uw_catch): Flip the matches to nil so that this catch
frame can no longer be identified as an unwind point by uw_throw,
and thus will not be re-entered for the purposes of handling
an exception. It remains visible for the purposes of running the
clean up code.
(uw_unwind): Prior to executing cleanup forms, flip the visibility
to 0. This means that the frame will no longer be re-entered
for any reason.
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(eval_init): New intrinsics.
* hash.c (struct_hash): assoc_fun parameters reversed.
(gethash, gethash_f, gethash_n): Likewise.
* lib.c (assoc, assq): Reversing parameters.
(find_package, acons_new, acons_new_l, aconsq_new): Reversing
arguments to assoc adn assq.
* lib.h (assoc, assq): Declarations updated.
* match.c (dest_set, dest_bind, h_var, h_coll, h_parallel, h_fun,
subst_vars, do_txeval, v_next, v_parallel, v_gather, v_collect,
v_flatten, v_cat, v_output, v_filter, f_fun, match_funcall):
Reversing arguments to assoc.
* unwind.c (uw_get_func, uw_exception_subtype_p, uw_register_subtype):
Reversing arguments to assoc.
* txr.1: Blank sections created for new functions.
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Lisp interpreter added.
* gc.c (finalize, mark_obj): Handle ENV objects.
* hash.c (struct hash): acons_new_l_fun function
pointer order of arguments change.
(equal_hash): Handle ENV.
(make_hash, gethash_l): Use cobj_handle for
type safety. Follow change in acons_new_l.
(gethash, gethash_f, remhash, hash_count,
hash_get_userdata, hash_set_userdata, hash_next): Use cobj_handle.
(gethash_n): New function.
* hash.h (gethash_n): Declared.
* lib.c (env_s): New symbol variable.
(code2type, equal): Handle ENV. (plusv, minusv, mul, mulv, trunc, mod,
gtv, ltv, gev, lev, maxv, minv, int_str): New functions.
(rehome_sym): New static function.
(func_f0, func_f1, func_f2, func_f3, func_f4, func_n0, func_n1,
func_n2, func_n3, func_n4): Initialize new fields of struct func.
(func_f0v, func_f1v, func_f2v, func_f3v, func_f4v,
func_n0v, func_n1v, func_n2v, func_n3v, func_n4v,
func_interp): New functions.
(apply): Function removed: sanely re-implemented in new eval.c file.
(funcall, funcall1, funcall2, funcall3, funcall4): Handle
variadic and interpreted functions.
(acons, acons_new, acons_new_l, aconsq_new, aconsq_new_l): Reordered
arguments for compatibility with Common Lisp acons.
(obj_init): Special hack to prepare hash_s symbol, which is
needed for type checking inside the hash table funtions invoked
by make_package, at a time when the symbol is not yet interned.
Initialize new env_s variable.
(obj_print, obj_pprint): Handle ENV. Fix confusing rendering of
of function type.
(init): Call new function eval_init.
* lib.h (enum type): New enumeration member ENV.
(struct func): functype member changed to bitfield.
New bitfied members minparam and variadic.
New members in f union: f0v, f1v, f2v, f3v,
f4v, n0v, n1v, n2v, n3v, n4v.
(struct env): New type.
(union obj): New member e of type struct env.
(env_s): Variable declared.
(plusv, minusv, mul, mulv, trunc, mod, gtv, ltv, gev, lev, maxv, minv,
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* Makefile (OBJS): New object file debug.o.
* dep.mk: Updated.
* match.c (h_fun): Use debug_begin and debug_end macros
to set up a debug frame for backtracing.
(match_line, match_files): Call debug_check to give debugger a chance
to instrument call.
(v_fun): Use debug_begin and debug_end macros to set up a debug frame
for backtracing. Call debug_check to give debugger a chance to
instrument call.
* stream.c (struct strm_ops): New function pointer, flush.
(stdio_maybe_write_error): Wrong word in error message corrected.
(stdio_flush): New static function.
(stdio_ops, pipe_ops): New function entered into tables.
(flush_stream): New function.
* stream.h (flush_stream): Declared.
* txr.c (help): New options documented.
(main): call to debug_init added. New debug options parsed and
opt_debugger set accordingly.
* unwind.c (uw_push_debug, uw_current_frame): New function.
* unwind.h (uw_frtype): New enumeration member UW_DBG.
(struct uw_debug): New frame variant.
(union uw_frame): New member, db.
(uw_push_debug, uw_current_frame): Declared,
* debug.c: New file.
* debug.h: New file.
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(get_filter): Handle (fun ...) syntax.
* match.c (v_bind): Establish dynamic environment frame around
dest_bind, and stash the bindings there so filters can have access
to the bindings.
(v_output): Likewise, around do_output calls.
(v_fun): New function.
(match_files): Function handling broken out into v_fun.
(match_funcall): New function.
* match.h (match_funcall): Declared.
* unwind.c (uw_push_env): Initialize match_context.
(uw_get_match_context, uw_set_match_context): New functions.
* unwind.h (struct uw_dynamic_env): New member, match_context.
(uw_get_match_context, uw_set_match_context): Declared.
* txr.1: Documented function filters.
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* unwind.c (uw_env_stack): New static variable.
(uw_unwind_to_exit_point): Maintain correct uw_env_stack
during unwinding.
(uw_find_env): Just retrieve the env stack pointer; no search.
(uw_push_env): Store a pointer to the previous
environmental frame and just initialize the bindings to nil.
No need to cons up a copy of the bindings from the previous frame.
(uw_get_func): Perform a search through the environment stack.
* unwind.h (struct uw_dynamic_env): New member, up_env.
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hash.h, lib.c, lib.h, match.c, match.h, parser.h, parser.l, parser.y,
regex.c, regex.h, stream.c, stream.h, txr.1, txr.c, txr.h, unwind.c,
unwind.h, utf8.c, utf8.h: Updated e-mail address.
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lib.h, match.c, match.h, parser.h, parser.l, parser.y, regex.c,
regex.h, stream.c, stream.h, txr.1, txr.c, txr.h, unwind.c, unwind.h,
utf8.c, utf8.h: Updated copyright year.
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in regex module not exposed in header. Etc.
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have a _s suffix.
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can be converted to a type long and vice versa. The configure
script tries to detect the appropriate type to use. Also,
some run-time checking is performed in the streams module
to detect which conversions specifier strings to use for
printing numbers.
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we have an unhandled exception too early in initialization.
Use C stream to print an error message and abort.
Using the nil stream variable will just cause a recursion bomb.
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we wouldn't have to declare object variables at all, so why
use an obtuse syntax to do so?)
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abstraction instead of directly using C standard I/O,
to eliminate most uses of C formatted I/O,
and fix numerous bugs, such variadic argument lists which
lack a terminating ``nao'' sentinel.
Bug 28033 is addressed by this patch, since streams no longer provide
printf-compatible formatting. The native formatter is extended with
some additional capabilities to take over.
The work on literal objects is expanded and they are now used
throughout the code base.
Fixed bad realloc in string output stream: reallocating by number
of wide chars rather than bytes.
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use wide character functions so that there is no illicit
mixing. (But the goal is to replace this usage with txr streams).
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This is incomplete. There are too many dependencies on
wide character support from the C stream I/O library,
and implicit use of some encoding which may not be UTF-8.
The regex code does not handle wide characters properly.
Character type is still int in some places, rather than wchar_t.
Test suite passes though.
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is needed for pipes that terminate abnormally or return failed
termination. Pipe and stdio streams have an extra description field
so they are printed in a readable way.
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by the integer constant 0 rather than a proper null pointer constant.
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Note: Version 016 ChangeLog message incorrect.
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