summaryrefslogtreecommitdiffstats
path: root/gc.h
Commit message (Collapse)AuthorAgeFilesLines
* Copyright year bump 2021.Kaz Kylheku2021-01-141-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * METALICENSE: 2020 copyrights bumped to 2021. Added note about SHA-256 routines from Colin Percival. * LICENSE, LICENSE-CYG, Makefile, alloca.h, args.c, args.h, arith.c, arith.h, buf.c, buf.h, cadr.c, cadr.h, chksum.c, chksum.h, chksums/crc32.c, chksums/crc32.h, combi.c, combi.h, configure, debug.c, debug.h, eval.c, eval.h, ffi.c, ffi.h, filter.c, filter.h, ftw.c, ftw.h, gc.c, gc.h, glob.c, glob.h, hash.c, hash.h, itypes.c, itypes.h, jmp.S, lex.yy.c.shipped, lib.c, lib.h, linenoise/linenoise.c, linenoise/linenoise.h, lisplib.c, lisplib.h, match.c, match.h, parser.c, parser.h, parser.l, parser.y, protsym.c, rand.c, rand.h, regex.c, regex.h, share/txr/stdlib/asm.tl, share/txr/stdlib/awk.tl, share/txr/stdlib/build.tl, share/txr/stdlib/cadr.tl, share/txr/stdlib/compiler.tl, share/txr/stdlib/conv.tl, share/txr/stdlib/copy-file.tl, share/txr/stdlib/debugger.tl, share/txr/stdlib/defset.tl, share/txr/stdlib/doloop.tl, share/txr/stdlib/each-prod.tl, share/txr/stdlib/error.tl, share/txr/stdlib/except.tl, share/txr/stdlib/ffi.tl, share/txr/stdlib/getopts.tl, share/txr/stdlib/getput.tl, share/txr/stdlib/hash.tl, share/txr/stdlib/ifa.tl, share/txr/stdlib/keyparams.tl, share/txr/stdlib/op.tl, share/txr/stdlib/package.tl, share/txr/stdlib/param.tl, share/txr/stdlib/path-test.tl, share/txr/stdlib/place.tl, share/txr/stdlib/pmac.tl, share/txr/stdlib/quips.tl, share/txr/stdlib/save-exe.tl, share/txr/stdlib/socket.tl, share/txr/stdlib/stream-wrap.tl, share/txr/stdlib/struct.tl, share/txr/stdlib/tagbody.tl, share/txr/stdlib/termios.tl, share/txr/stdlib/trace.tl, share/txr/stdlib/txr-case.tl, share/txr/stdlib/type.tl, share/txr/stdlib/vm-param.tl, share/txr/stdlib/with-resources.tl, share/txr/stdlib/with-stream.tl, share/txr/stdlib/yield.tl, signal.c, signal.h, socket.c, socket.h, stream.c, stream.h, struct.c, struct.h, strudel.c, strudel.h, sysif.c, sysif.h, syslog.c, syslog.h, termios.c, termios.h, time.c, time.h, tree.c, tree.h, txr.1, txr.c, txr.h, unwind.c, unwind.h, utf8.c, utf8.h, vm.c, vm.h, vmop.h, win/cleansvg.txr, y.tab.c.shipped: Copyright year bumped to 2021.
* Copyright year bump 2020.Kaz Kylheku2019-12-311-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * LICENSE, LICENSE-CYG, METALICENSE, Makefile, alloca.h, args.c, args.h, arith.c, arith.h, buf.c, buf.h, cadr.c, cadr.h, chksum.c, chksum.h, chksums/crc32.c, chksums/crc32.h, combi.c, combi.h, configure, debug.c, debug.h, eval.c, eval.h, ffi.c, ffi.h, filter.c, filter.h, ftw.c, ftw.h, gc.c, gc.h, glob.c, glob.h, hash.c, hash.h, itypes.c, itypes.h, jmp.S, lib.c, lib.h, linenoise/linenoise.c, linenoise/linenoise.h, lisplib.c, lisplib.h, match.c, match.h, parser.c, parser.h, parser.l, parser.y, protsym.c, rand.c, rand.h, regex.c, regex.h, share/txr/stdlib/asm.tl, share/txr/stdlib/awk.tl, share/txr/stdlib/build.tl, share/txr/stdlib/cadr.tl, share/txr/stdlib/compiler.tl, share/txr/stdlib/conv.tl, share/txr/stdlib/debugger.tl, share/txr/stdlib/defset.tl, share/txr/stdlib/doloop.tl, share/txr/stdlib/error.tl, share/txr/stdlib/except.tl, share/txr/stdlib/ffi.tl, share/txr/stdlib/getopts.tl, share/txr/stdlib/getput.tl, share/txr/stdlib/hash.tl, share/txr/stdlib/ifa.tl, share/txr/stdlib/keyparams.tl, share/txr/stdlib/op.tl, share/txr/stdlib/package.tl, share/txr/stdlib/param.tl, share/txr/stdlib/path-test.tl, share/txr/stdlib/place.tl, share/txr/stdlib/pmac.tl, share/txr/stdlib/save-exe.tl, share/txr/stdlib/socket.tl, share/txr/stdlib/stream-wrap.tl, share/txr/stdlib/struct.tl, share/txr/stdlib/tagbody.tl, share/txr/stdlib/termios.tl, share/txr/stdlib/trace.tl, share/txr/stdlib/txr-case.tl, share/txr/stdlib/type.tl, share/txr/stdlib/vm-param.tl, share/txr/stdlib/with-resources.tl, share/txr/stdlib/with-stream.tl, share/txr/stdlib/yield.tl, signal.c, signal.h, socket.c, socket.h, stream.c, stream.h, struct.c, struct.h, strudel.c, strudel.h, sysif.c, sysif.h, syslog.c, syslog.h, termios.c, termios.h, tree.c, tree.h, txr.1, txr.c, txr.h, unwind.c, unwind.h, utf8.c, utf8.h, vm.c, vm.h, vmop.h, win/cleansvg.txr: Extended copyright notices to 2020.
* Copyright year bump 2019.Kaz Kylheku2019-01-161-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * LICENSE, LICENSE-CYG, METALICENSE, Makefile, args.c, args.h, arith.c, arith.h, buf.c, buf.h, cadr.c, cadr.h, combi.c, combi.h, configure, debug.c, debug.h, eval.c, eval.h, ffi.c, ffi.h, filter.c, filter.h, ftw.h, gc.c, gc.h, glob.c, glob.h, hash.c, hash.h, itypes.c, itypes.h, jmp.S, lib.c, lib.h, lisplib.c, lisplib.h, match.c, match.h, parser.c, parser.h, parser.l, parser.y, protsym.c, rand.c, rand.h, regex.c, regex.h, share/txr/stdlib/asm.tl, share/txr/stdlib/awk.tl, share/txr/stdlib/build.tl, share/txr/stdlib/cadr.tl, share/txr/stdlib/compiler.tl, share/txr/stdlib/conv.tl, share/txr/stdlib/doloop.tl, share/txr/stdlib/error.tl, share/txr/stdlib/except.tl, share/txr/stdlib/ffi.tl, share/txr/stdlib/getopts.tl, share/txr/stdlib/getput.tl, share/txr/stdlib/hash.tl, share/txr/stdlib/ifa.tl, share/txr/stdlib/keyparams.tl, share/txr/stdlib/op.tl, share/txr/stdlib/package.tl, share/txr/stdlib/path-test.tl, share/txr/stdlib/place.tl, share/txr/stdlib/pmac.tl, share/txr/stdlib/socket.tl, share/txr/stdlib/stream-wrap.tl, share/txr/stdlib/struct.tl, share/txr/stdlib/tagbody.tl, share/txr/stdlib/termios.tl, share/txr/stdlib/trace.tl, share/txr/stdlib/txr-case.tl, share/txr/stdlib/type.tl, share/txr/stdlib/vm-param.tl, share/txr/stdlib/with-resources.tl, share/txr/stdlib/with-stream.tl, share/txr/stdlib/yield.tl, signal.c, signal.h, socket.c, socket.h, stream.c, stream.h, struct.c, struct.h, strudel.c, strudel.h, sysif.c, sysif.h, syslog.c, syslog.h, termios.c, termios.h, txr.1, txr.c, txr.h, unwind.c, unwind.h, utf8.c, utf8.h, vm.c, vm.h, vmop.h, win/cleansvg.txr: Extended Copyright line to 2018.
* gc: eliminate most uses of gc_mutated.Kaz Kylheku2018-11-061-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The code is using gc_mutated in situations that resemble assignment: a value is stored into a slot in some object. These situations should be handled using the same logic as embodied in the gc_set function. This is because gc_set will consider both objects, and in many cases will not have to do anything special. E.g. if an immature object is stored into another immature object, or mature into immature, or mature into mature. Whereas gc_mutated is a "just in case" function which forces the garbage collector to traverse the indicated object, if that object is mature. In this patch we refactor gc_set to expose its underlying logic with a somewhat more flexible function called gc_assign_check. We put that behind a conditionally defined macro called setcheck, and then use that to replace invocations of the mut macro in various places. The only uses of gc_mutated that remain are in the bulk vector assignment and copy_struct: operations in which potentially many element values are migrated from one aggregate object to another, making it potentially expensive to do individual assignment checks. * gc.c (gc_assign_check): New function, formed from guts of gc_set. (gc_set): Now a trivial function, implemented via call to gc_assign_check. * gc.h (gc_assign_check): Declared. * lib.c (cons): Use setcheck instead of gc_mutated, since we are storing only two values into the existing cons: the car and the cdr. * struct.c (clear_struct): Use setcheck instead of gc_mutated, since we are just storing one value into the structure, the clear_val. The fact that we are storing it into multiple slots is irrelevant. * vm.c (vm_make_closure): Use setcheck instead of mut, using the new heap_vector as the child object with regard to the closure. Rationale: the only threat here is that when we allocate the heap vector, a GC is triggered which pushes the closure into the mature generation. Then the store of the heap vector into the closure is a wrong-way reference, with regard to generational GC. The elements in the vector are immaterial; they are older than both the closure and the vector, therefore their relationship to either object is a right-way reference. (vm_set, vm_sm_set): Replace mut by a setcheck between the vector from the display and the new value being stored in it. (vm_stab): Replace the gc_mutated check, which should have been a mut macro call, with a setcheck between the vm, and the binding being stored into the table. The gc_mutated should have been wrapped with an #if CONFIG_GEN_GC so we are fixing a build bug here: the code would have prevented TXR from being built with the generational GC disabled.
* Copyright year bump 2018.Kaz Kylheku2018-02-151-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * LICENSE, LICENSE-CYG, METALICENSE, Makefile, args.c, args.h, arith.c, arith.h, buf.c, buf.h, cadr.c, cadr.h, combi.c, combi.h, configure, debug.c, debug.h, eval.c, eval.h, ffi.c, ffi.h, filter.c, filter.h, ftw.c, ftw.h, gc.c, gc.h, glob.c, glob.h, hash.c, hash.h, itypes.c, itypes.h, jmp.S, lib.c, lib.h, lisplib.c, lisplib.h, match.c, match.h, parser.c, parser.h, parser.l, parser.y, protsym.c, rand.c, rand.h, regex.c, regex.h, share/txr/stdlib/awk.tl, share/txr/stdlib/build.tl, share/txr/stdlib/cadr.tl, share/txr/stdlib/conv.tl, share/txr/stdlib/doloop.tl, share/txr/stdlib/error.tl, share/txr/stdlib/except.tl, share/txr/stdlib/ffi.tl, share/txr/stdlib/getopts.tl, share/txr/stdlib/getput.tl, share/txr/stdlib/hash.tl, share/txr/stdlib/ifa.tl, share/txr/stdlib/keyparams.tl, share/txr/stdlib/op.tl, share/txr/stdlib/package.tl, share/txr/stdlib/path-test.tl, share/txr/stdlib/place.tl, share/txr/stdlib/pmac.tl, share/txr/stdlib/socket.tl, share/txr/stdlib/stream-wrap.tl, share/txr/stdlib/struct.tl, share/txr/stdlib/tagbody.tl, share/txr/stdlib/termios.tl, share/txr/stdlib/txr-case.tl, share/txr/stdlib/type.tl, share/txr/stdlib/with-resources.tl, share/txr/stdlib/with-stream.tl, share/txr/stdlib/yield.tl, signal.c, signal.h, socket.c, socket.h, stream.c, stream.h, struct.c, struct.h, strudel.c, strudel.h, sysif.c, sysif.h, syslog.c, syslog.h, termios.c, termios.h, txr.1, txr.c, txr.h, unwind.c, unwind.h, utf8.c, utf8.h, win/cleansvg.txr: Extended Copyright line to 2018.
* ffi: sanity check on object in ffi_val_get.Kaz Kylheku2017-05-241-0/+2
| | | | | | | | | | | | | | | | | * ffi.c (ffi_val_get): Throw an exception if the object doesn't appear valid. * gc.c (valid_object_p): New function. Invalid objects are those that are pointers, but either not into a heap, or else to a freed object or to an object that is marked by the garbage collector (should only be seen while GC is running). All others are valid. There can be false positives here: a value with the LIT tag is in fact a pointer, but we don't check whether that is valid. * gc.c (valid_object_p): Declared. * txr.1: Remarks added to documentation of FFI val type.
* Bump copyright year to 2017.Kaz Kylheku2017-01-231-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | * LICENSE, LICENSE-CYG, METALICENSE, Makefile, args.c, args.h, arith.c, arith.h, cadr.c, cadr.h, combi.c, combi.h, configure, debug.c, debug.h, eval.c, eval.h, filter.c, filter.h, ftw.c, ftw.h, gc.c, gc.h, glob.c, glob.h, hash.c, hash.h, jmp.S, lib.c, lib.h, lisplib.c, lisplib.h, match.c, match.h, parser.c, parser.h, parser.l, parser.y, rand.c, rand.h, regex.c, regex.h, signal.c, signal.h, stream.c, stream.h, struct.c, struct.h, sysif.c, sysif.h, syslog.c, syslog.h, termios.c, termios.h, txr.1, txr.c, txr.h, unwind.c, unwind.h, utf8.c, utf8.h, share/txr/stdlib/awk.tl, share/txr/stdlib/build.tl, share/txr/stdlib/cadr.tl, share/txr/stdlib/conv.tl, share/txr/stdlib/except.tl, share/txr/stdlib/getopts.tl, share/txr/stdlib/getput.tl, share/txr/stdlib/hash.tl, share/txr/stdlib/ifa.tl, share/txr/stdlib/package.tl, share/txr/stdlib/path-test.tl, share/txr/stdlib/place.tl, share/txr/stdlib/socket.tl, share/txr/stdlib/struct.tl, share/txr/stdlib/tagbody.tl, share/txr/stdlib/termios.tl, share/txr/stdlib/txr-case.tl, share/txr/stdlib/type.tl, share/txr/stdlib/with-resources.tl, share/txr/stdlib/with-stream.tl, share/txr/stdlib/yield.tl: Add 2017 to all copyright headers and strings.
* Cancel in-progress gc if handling async signal.Kaz Kylheku2016-12-121-0/+2
| | | | | | | | | | | | | | | | | | | | If a signal goes off in the middle of gc that is routed to an async lambda handler, we should cancel gc, so the handler finds the heap in a good state. Of course, the handler must not return in this case, or else the interrupted gc will try to resume. * gc.c (inprogress): New static flag. (gc): Increment and decrement inprogress variable. Abort if re-entered. (gc_inprogress): New function. (unmark): Do not clear FREE flags, only REACHABLE. (gc_cancel): New function. * gc.h (gc_inprogress, gc_cancel): Declared. * signal.c (sig_handler): In the async lambda case, check for an in-progress gc and cancel it.
* Synchronize license comments with LICENSE.Kaz Kylheku2016-10-011-16/+17
| | | | | | | | | | | | | | | | | | | | * Makefile, args.c, args.h, arith.c, arith.h, cadr.c, cadr.h, combi.c, combi.h, configure, debug.c, debug.h, eval.c, eval.h, filter.c, filter.h, ftw.c, ftw.h, gc.c, gc.h, glob.c, glob.h, hash.c, hash.h, jmp.S, lib.c, lib.h, lisplib.c, lisplib.h, match.c, match.h, parser.c, parser.h, parser.l, parser.y, rand.c, rand.h, regex.c, regex.h, share/txr/stdlib/awk.tl, share/txr/stdlib/build.tl, share/txr/stdlib/cadr.tl, share/txr/stdlib/conv.tl, share/txr/stdlib/except.tl, share/txr/stdlib/hash.tl, share/txr/stdlib/ifa.tl, share/txr/stdlib/path-test.tl, share/txr/stdlib/place.tl, share/txr/stdlib/socket.tl, share/txr/stdlib/struct.tl, share/txr/stdlib/termios.tl, share/txr/stdlib/txr-case.tl, share/txr/stdlib/type.tl, share/txr/stdlib/with-resources.tl, share/txr/stdlib/with-stream.tl, share/txr/stdlib/yield.tl, signal.c, signal.h, socket.c, socket.h, stream.c, stream.h, struct.c, struct.h, sysif.c, sysif.h, syslog.c, syslog.h, termios.c, termios.h, txr.1, txr.c, txr.h, unwind.c, unwind.h, utf8.c, utf8.h: Revert to verbatim 2-Clause BSD.
* Rename EXTRA_DEBUGGING to CONFIG_EXTRA_DEBUGGING.Kaz Kylheku2016-06-171-1/+1
| | | | | | | | * configure: Generate #define CONFIG_EXTRA_DEBUGGING 1 in config.h header, rather than EXTRA_DEBUGGING. * gc.c, gc.h, hash.c: Change references to EXTRA_DEBUGGING preprocessor symbol to CONFIG_EXTRA_DEBUGGING.
* New --free-all option for freeing memory on exit.Kaz Kylheku2016-06-071-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Although we are garbage-collected, being able to clean up on shutdown is nevertheless useful for uncovering leaks. Leaks can occur, for instance, due to neglect to free out-of-heap satellite data from objects that are reclaimed by gc. This feature is long overdue. * arith.c, arith.h (arith_free_all): New function. * gc.c, gc.h (gc_free_all): New function. * lib.c (init): Remove program name parameter and redundant initialization of progname globl variable. * lib.h (progname): Superfluous declaration removed. This is already declared in txr.h. (init): Declaration updated. * regex.c (char_set_destroy): Do not check the static allocation flag here; just destroy the object. Do check for a null pointer, though. (char_set_cobj_destroy): This cobj destructor now checks the static flag of the char set object and avoids freeing it. Thus our char set singletons are left alone by gc, but our global freeing function takes care of them. (wide_cs): New static variable moved out of wide_display_char_p to static scope. (regex_free_all): New function. * regex.h (regex_free_all): Declared. * txr.c (progname): const qualifier and initializer removed. (main): Ensure progname is always dynamically allocated, even in the argv[0] == 0 case. Do not pass progname to init; it doesn't take that argument any more. (free_all): New static function. (txr_main): Implement --free-all option. * txr.h (progname): Declaration updated.
* Copyright year bump.Kaz Kylheku2015-12-311-1/+1
| | | | | | | | | | | | | | | | | | | | | | | * LICENSE, METALICENSE, Makefile, args.c, args.h, arith.c, arith.h, cadr.c, cadr.h, combi.c, combi.h, configure, debug.c, debug.h, eval.c, eval.h, filter.c, filter.h, gc.c, gc.h, glob.c, glob.h, hash.c, hash.h, jmp.S, lib.c, lib.h, lisplib.c, lisplib.h, match.c, match.h, parser.c, parser.h, parser.l, parser.y, rand.c, rand.h, regex.c, regex.h, share/txr/stdlib/cadr.tl, share/txr/stdlib/except.tl, share/txr/stdlib/hash.tl, share/txr/stdlib/ifa.tl, share/txr/stdlib/path-test.tl, share/txr/stdlib/place.tl, share/txr/stdlib/struct.tl, share/txr/stdlib/txr-case.tl, share/txr/stdlib/type.tl, share/txr/stdlib/with-resources.tl, share/txr/stdlib/with-stream.tl, share/txr/stdlib/yield.tl, signal.c, signal.h, stream.c, stream.h, struct.c, struct.h, sysif.c, sysif.h, syslog.c, syslog.h, txr.1, txr.c, txr.h, unwind.c, unwind.h, utf8.c, utf8.h: Add 2016 copyright. * linenoise/LICENSE, linenoise/linenoise.c, linenoise/linenoise.h: Bump one principal author's copyright from 2014 to 2015. The code is based on a snapshot of 2015 upstream work.
* Useful debugging function for spurious retention.Kaz Kylheku2015-11-201-0/+1
| | | | | | * gc.c (gc_report_copies): New function * gc.h (gc_report_copies): Declared.
* Remove unused rel1 function.Kaz Kylheku2015-11-061-1/+0
| | | | | | * gc.c (rel1): Removed. * gc.h (rel1): Declaration removed.
* Expose memory region marking function.Kaz Kylheku2015-10-251-0/+1
| | | | | | * gc.c (gc_mark_mem): New function. * gc.h (gc_mark_mem): Declared.
* New function: call-finalizers.Kaz Kylheku2015-10-061-0/+1
| | | | | | | | | * gc.c (gc_call_finalizers): New function. (gc_late_init): Register call-finalizers intrinsic. * gc.h (gc_call_finalizers): Declared. * txr.1: documented call-finalizers.
* Support for reverse order in finalization.Kaz Kylheku2015-10-011-1/+1
| | | | | | | | | | | | | | | | | | | | | | A new optional argument on finalize allows it to be expressed that multiple finalizers on the same object are to be called in reverse order, which is potentially for objects with inheritance. * gc.c (gc_finalize): New optional argument, rev_order_p. Insert at the head of the list if this argument is specified and true. (gc_late_init): Register finalize as three-argument function with optional argument. * gc.h (gc_finalize): Declaration updated. * share/txr/stdlib/struct.tl (defstruct): Register :fini functions in reverse, so that derived finalizers are called before supertype finalizers. * txr.1: Documented new finalize argument, and behavior of :fini.
* Fix incorrect finalization of struct-type.Kaz Kylheku2015-09-021-0/+1
| | | | | | | | | | | | | | | | | | | | | | The issue is that we can't call remhash in the cobj destroy handler, because we are in the middle of gc. The fix is to register a proper finalization hook. This is the first use of finalize from within TXR. * gc.c (gc_finalize): static becomes extern. * gc.h (gc_finalize): Declared. * struct.c (struct_type_finalize_f): New static variable. (struct_init): GC-protect new static variable, and initialize it to point to new struct_type_finalize function. (struct_type_finalize): New function: performs the remhash calls previously done in struct_type_free. (make_struct_type): Register a finalizer hook for every new structure type, which will call struct_type_finalize. (struct_type_free): Static function removed. (struct_type_ops): Use generic cobj_destroy_free_op since all that is left to do is to free the handle.
* Provide conservative marking interface.Kaz Kylheku2015-08-191-1/+1
| | | | | | | | | | | | | | | | | | | GC now exports a function for marking something that might not be an object, instead of a function for testing. The previous way wasn't integrated with Valgrind properly, and didn't observe the FREE flag. * gc.c (gc_is_heap_obj): Function removed. (mark_obj_maybe): New static function, with body consisting of code moved from mark_mem_region. (mark_mem_region): Moved code replaced by call to mark_obj_maybe. (gc_conservative_mark): New function, wraps mark_obj_maybe. * gc.h (gc_conservative_mark): Declared. (gc_is_heap_obj): Declaration removed. * parser.c (yy_tok_mark): Use gc_conservative_mark instead of gc_is_heap_obj check and gc_mark.
* Crafting a better parser-priming hack.Kaz Kylheku2015-08-121-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The method of inserting a character sequence which generates a SECRET_TOKEN_E token is being replaced with a purely token based method. Because we don't manipulate the input stream, the lexer is not involved. We don't have to flush its state and deal with the carry-over of the yy_hold_char. This comes about because recent changes expose a weakness in the old scheme. Now that a top-level expression can have the form expr.expr, it means that the Yacc parser reads one token ahead, to see whether there is a dot or something else. This lookahead token is discarded. We must re-create it when we call yyparse again. This re-creation is done by creating a custom yylex function, which can maintain pushback tokens. We can prime this array of pushback tokens to generate the SECRET_TOKEN_E, as well as to re-inject the lookahead symbol that was thrown away by the previous yyparse. To know which lookahead symbol to re-inject is simple: the scanner just keeps a copy of the most recent token that it returns to the parser. When the parser returns, that token must be the lookahead one. The tokens we keep now in the parser structure are subject to garbage collection, and so we must mark them. Since the YYSTYPE union has no type field, a new API is opened up into the garbage collector to help implement a conservative GC technique. * gc.c (gc_is_heap_obj): New function. * gc.h (gc_is_heap_obj): Declared. * match.c: Include y.tab.h. This is now needed by any module that needs to instantiate a parser_t structure, because members of type YYSTYPE occur in the structure. (parser.h can still be included without y.tab.h, but only an incomplete declaration for the parser strucure is then given, and a few functions are not declared.) * parser.c (yy_tok_mark): New static function. (parser_mark): Mark the recent token and the pushback tokens. (parser_common_init): Initialize the recent token, the pushback tokens, and the pushback stack index. (pushback_token): New static function. (prime_parser): hold_byte argument removed. Body considerably simplified. The catenated stream trick is no longer required. All we do here is set up two pushback tokens and prime the scanner, if necessary, so it is in the right start state for Lisp. * parser.l (YY_DECL): Take over definition of scanning function, renaming to yylex_impl, so we can implement yylex. (grammar): Rule which produces SECRET_ESCAPE_E token removed. (reset_scanner): Function removed. (yylex): New function. * parser.h (struct parser): Now only forward-declared unless y.tab.h has been included. New members, recent_tok, tok_pushback and tok_idx. (yyset_hold_char): Declared. (reset_scanner): Declaration removed. (yylex): Declared (if y.tab.h included). (prime_parser): Declaration updated. (prime_scanner): Declared. * Makefile: express new dependency on existence of y.tab.h of txr.o, match.o and parser.o.
* Deal with spurious retention in function application.Kaz Kylheku2015-03-311-0/+3
| | | | | | | | | | | | * gc.h (zap): New inline function. (z): New macro. * lib.c (generic_funcall, funcall1, funcall2, funcall4, do_not, do_dup, do_iff): Use z macro to burn funargs with no next use. * eval.c (apply, apply_frob_args, iapply, call, do_eval, op_dwim, mapcarv, mappendv, lazy_mapcarv_func, mapdov, do_apf, do_ipf, callf): Use z macro to burn funargs with no next use.
* Update copyright notices from 2014 to 2015.Kaz Kylheku2015-02-011-1/+1
| | | | | | | | | | | * arith.c, arith.h, combi.c, combi.h, debug.c, debug.h, eval.c, eval.h, filter.c, filter.h, gc.c, gc.h, hash.c, hash.h, lib.c, lib.h, match.c, match.h, parser.h, rand.c, rand.h, regex.c, regex.h, signal.c, signal.h, stream.c, stream.h, sysif.c, sysif.h, syslog.c, syslog.h, txr.c, txr.h, unwind.c, unwind.h, utf8.c, utf8.h: Update. * LICENSE, METALICENSE: Likewise.
* * gc.h (break_obj): Missing extern added on declaration.Kaz Kylheku2014-10-301-1/+1
| | | | This broke C++ compilation with -DEXTRA_DEBUGGING turned on.
* Ensure that a hash reorganization doesn't take placeKaz Kylheku2014-10-221-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | during a traversal, which could cause items to be visited twice or skipped. * gc.c (full_gc): Changed from static to exter (full_gc): Changed to internal linkage. * gc.h (full_gc): Declared. * hash.c (struct hash): New member, usecount. (struct hash_iter): New member, next. (reachable_iters): New static variable. (hash_mark): Reset the usecount of every reachable hash table. (hash_iter_mark): Add every reachable iterator to reachable_iters list. (make_hash, make_similar_hash, copy_hash): Initialize usecount. (gethash_c): Do not call hash_grow if usecount is nonzero. (hash_begin): Initialize next field of hash_iter to null. Increment use count on hash table. (hash_next): When traversal ends, release use count, and null out the hash table reference. (do_weak_tables): New static function. (do_iters): New static function. (hash_process_weak): Weak hash processing logic moved to do_weak_tables. Also calls do_iters. * txr.1: Describe hash table traversal, and the assurances and caveats about inserting and deleting items.
* * gc.c (MALLOC_DELTA_THRESH): Macro remaned to DFL_MALLOC_DELTA_THRESH.Kaz Kylheku2014-09-081-0/+1
| | | | | | | | | | | | | | | | | | | | | (opt_gc_delta): New global variable. (make_obj): Use opt_gc_delta rather than MALLOC_DELTA_THRESH. (gc_set_delta, gc_wrap): New static functions. (gc_late_init): New function. * gc.h (gc_late_init): Declared. * genvim.txr: scan gc.c also. * lib.c (init): call gc_late_init. * txr.1: Document new --gc-delta option and the functions gc and gc-set-delta. * txr.c (help): Help text for --gc-delta. (txr_main): Parse --gc-delta option. * txr.h (opt_gc_delta): Declared.
* * gc.c (top): Renamed to gc_prot_top, turned extern.Kaz Kylheku2014-08-251-0/+1
| | | | | | | | | (prot1, rel1, mark): Follow rename. * gc.h (gc_prot_top): Declared. * signal.h (extended_jmp_buf): New member, gc_pt. (extended_setjmp): Save and restore gc_prot_top.
* * Makefile, arith.c, arith.h, combi.c, combi.h, configure, debug.c,Kaz Kylheku2014-07-231-16/+16
| | | | | | | | debug.h, eval.c, eval.h, filter.c, filter.h, gc.c, gc.h, hash.c, hash.h, lib.c, lib.h, match.c, match.h, parser.h, parser.l, parser.y, rand.c, rand.h, regex.c, regex.h, signal.c, signal.h, stream.c, stream.h, syslog.c, syslog.h, txr.c, txr.h, unwind.c, unwind.h, utf8.c, utf8.h: Synchronize license header with LICENSE.
* Change to how locations are passed around, for the sake of generationalKaz Kylheku2014-03-291-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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,
* On platforms with sigaltstack, TXR programs can now catch theKaz Kylheku2014-03-131-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | segmentation fault that occurs when running out of stack space, and escape by throwing an exception. Also, bugfix: save and restore the gc enable/disable state. Without this, if we are ever running cod in a gc disabled state and it jumps out, gc stays disabled. * configure: added check for sigaltstack. * gc.h (gc_enabled): Declaration added for existing variable. * signal.c (is_cpu_exception): New static function. (sig_handler): For cpu_exception type signals that pertain to the execution of some instruction, turn on async_sig_enabled, so that the signal is not deferred. Otherwise we will just return without calling the user-defined handler, restart the instruction and get into a loop. Also, disable gc around the handler just in case. One issue is that we might be on an alternate stack, which gc won't like. (setup_alt_stack, teardown_alt_stack): New static functions. (set_sig_handler): If we have sigaltstack, and are asked to set up a SEGV handler, then set it up on the alternate stack. * signal.h (extended_jmp_buf): Adding new member, gc. (extended_setjmp, extended_longjmp): use gc member to save and restore the gc_enable state across setjmp and longjmp.
* Export break_obj.Kaz Kylheku2014-02-011-0/+4
| | | | | | | * gc.c (break_obj): Change to external linkage. (mark): Use t variable instead of re-evaluating obj->t.type. * gc.h (break_obj): Declared.
* First cut at signal handling support.Kaz Kylheku2013-12-121-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 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.
* Bumping copyrights to 2014 and expressing them as year ranges.Kaz Kylheku2013-12-101-1/+1
| | | | Fixing some errors in copyright comments.
* Bunch of fixes.Kaz Kylheku2012-04-051-1/+1
| | | | | | | | | | | | | | | | | * 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.
* * eval.c (op_modplace): push replaced with mpush (mutating push).Kaz Kylheku2012-04-031-0/+1
| | | | | | | | | | | | | | | * gc.c (gc_push): New function. * gc.h (gc_push): Declared. * hash.c (pushhash): Use mpush. * lib.c (push): Reverted to unsafe operation. TODO comment replaced with warning. (lazy_flatten_scan): push occurence commented as safe. (lazy_stream_func): Unsafe push replaced with mpush. * lib.h (mpush): New macro.
* * configure: Support a gen-gc configuration variable whichKaz Kylheku2012-04-031-0/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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.
* * arith.c: Updated copyright year.Kaz Kylheku2012-02-251-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 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.
* * LICENSE, Makefile, configure, filter.c, filter.h, gc.c, gc.h, hash.c,Kaz Kylheku2011-10-041-1/+1
| | | | | | 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.
* * LICENSE, Makefile, configure, gc.c, gc.h, hash.c, hash.h, lib.c,Kaz Kylheku2011-09-231-1/+1
| | | | | | 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.
* Bump copyrights to 2010.Kaz Kylheku2010-10-051-1/+1
|
* Fixing weak hash tables.Kaz Kylheku2010-01-251-0/+2
|
* Fix for unbounded memory growth problem reproduced with GCC 4.4.1Kaz Kylheku2010-01-211-0/+2
| | | | | | on 32 bit x86 Fedora. This happens because the lazy list variable ``data'' in the match_files function is optimized to a register, but a stale value of that variable persists in the backing storage.
* Code cleanup. All private functions static. Private stuffKaz Kylheku2009-11-281-0/+1
| | | | in regex module not exposed in header. Etc.
* Changing ``obj_t *'' occurences to a ``val'' typedef. (Ideally,Kaz Kylheku2009-11-201-8/+8
| | | | | we wouldn't have to declare object variables at all, so why use an obtuse syntax to do so?)
* First cut at hash tables. One known problem is allocation during gc,Kaz Kylheku2009-11-091-0/+1
| | | | due to use of boxed numbers for vector access.
* txr-015 2009-10-15txr-015Kaz Kylheku2017-07-311-3/+1
|
* txr-013 2009-09-30txr-013Kaz Kylheku2017-07-311-1/+1
|
* txr-011 2009-09-25txr-011Kaz Kylheku2017-07-311-0/+36
generated by cgit v1.2.3 (git 2.25.1) at 2025-03-09 22:03:35 +0000