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GNU LESSER GENERAL PUBLIC LICENSE
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or that patent license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
12. No Surrender of Others' Freedom.
If conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot convey a
covered work so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you may
not convey it at all. For example, if you agree to terms that obligate you
to collect a royalty for further conveying from those to whom you convey
the Program, the only way you could satisfy both those terms and this
License would be to refrain entirely from conveying the Program.
13. Use with the GNU Affero General Public License.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU Affero General Public License into a single
combined work, and to convey the resulting work. The terms of this
License will continue to apply to the part which is the covered work,
but the special requirements of the GNU Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions of
the GNU General Public License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
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THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
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USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
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PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
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17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

33
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.PHONY: test_strings clean
COMMON_OBJECTS=uns.o
CHENEY_C89_OBJECTS=cheney_c89.o c89_relo.o
CFLAGS=-Wall -Wno-overlength-strings -std=c89 -Werror -pedantic -fPIC -g -Iinclude
libuniversalservice.so: $(COMMON_OBJECTS) $(CHENEY_C89_OBJECTS)
$(CC) -shared $(COMMON_OBJECTS) $(CHENEY_C89_OBJECTS) -o libuniversalservice.so
.c.o:
$(CC) $(CFLAGS) $< -c -o $@
#############################################
## Examples
#############################################
STRING_TEST_OBJS=examples/string/test_common.o examples/string/uns_string.o
STRING_TESTS= examples/string/test_small
examples/string/test_small: examples/string/test_small.c $(STRING_TEST_OBJS) libuniversalservice.so
$(CC) -I. -Iext $(CFLAGS) examples/string/test_small.c $(STRING_TEST_OBJS) -L. -luniversalservice -o examples/string/test_small
test_strings: $(STRING_TESTS)
for i in $(STRING_TESTS); do \
LD_LIBRARY_PATH=$$(pwd) valgrind $$i; \
done
###################
## Clean
##################
clean:
rm -f $(STRING_TEST_OBJS) $(STRING_TESTS) $(COMMON_OBJECTS) $(CHENEY_STRING_OBJECTS)

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=================
Universal Service
=================
Universal Service is a collection of garbage collectors written in C.
-------
License
-------
Universal Service is licensed under the LGPL-3.0-or-later.
Contrary to popular belief, **static linking LGPL code does not force
your code to be LGPL.** The LGPL requires you to allow the user to swap
out the LGPL code for anything that fits the interface, and for you to
redistribute modifications to the LGPL code. From the
`GNU Project FAQ <https://www.gnu.org/licenses/gpl-faq.html#LGPLStaticVsDynamic>`_:
> Does the LGPL have different requirements for statically vs dynamically
> linked modules with a covered work?
>
> For the purpose of complying with the LGPL (any extant version: v2, v2.1 or v3):
>
> If you statically link against an LGPLed library, you must also
> provide your application in an object (not necessarily source) format,
> so that a user has the opportunity to modify the library and relink
> the application.
You can statically link any LGPL 3.0 code to code of permissive licenses
(like MIT), and even to source-available license (like the SSPL or the
Commons Clause) as long as the end user can recompile the program to use
their own version of the library.

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/* Copyright (C) 2024 Peter McGoron
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <assert.h>
#include "uns.h"
#include "internal/c89_relo.h"
typedef struct uns_c89_relo_hdr Hdr;
size_t uns_c89_relo_get_len(void *p)
{
Hdr *hdr = uns_c89_relo_get_hdr(p);
return (size_t)(hdr->len < 0 ? -hdr->len : hdr->len);
}
size_t uns_c89_relo_get_record_len(void *p)
{
Hdr *hdr = uns_c89_relo_get_hdr(p);
if (hdr->len > 0)
return 0;
return (size_t)(-hdr->len) / sizeof(void *);
}
void *uns_c89_relo_init(void *p, size_t len_size, int is_record)
{
Hdr *hdr = p;
assert(len_size < UNS_SWORD_MAX);
hdr->relo = NULL;
hdr->len = (uns_sword)len_size;
if (is_record)
hdr->len = -hdr->len;
return hdr + 1;
}
static void check_len(void *rec, size_t i)
{
assert(i * sizeof(void *) < uns_c89_relo_get_len(rec));
}
void uns_c89_relo_record_set(void *rec, size_t i, void *v)
{
check_len(rec, i);
memcpy((unsigned char *)rec + i*sizeof(void*), &v, sizeof(v));
}
void *uns_c89_relo_record_get(void *rec, size_t i)
{
void *v;
check_len(rec, i);
memcpy(&v, (unsigned char *)rec + i*sizeof(void*), sizeof(v));
return v;
}

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/* Copyright (C) 2024 Peter McGoron
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <limits.h>
#include <assert.h>
#include <string.h>
#include "uns.h"
#include "internal/c89_relo.h"
#include "cheney_c89.h"
struct ctx {
unsigned char *tospace;
unsigned char *tospace_end;
unsigned char *tospace_alloc;
};
const size_t uns_cheney_c89_ctx_size = sizeof(struct ctx);
static void zero_ctx(struct ctx *ctx)
{
ctx->tospace = 0;
ctx->tospace_end = 0;
ctx->tospace_alloc = 0;
}
void uns_cheney_c89_deinit(struct uns_gc *gc)
{
struct ctx *ctx = gc->ctx;
free(ctx->tospace);
}
/* Allocate without doing bounds checking. This is common code for
* collecting (when all values will fit into the tospace) and
* allocation (where bounds checking is done beforehand).
*/
static void *raw_alloc(struct ctx *ctx, size_t len, int is_record)
{
unsigned char *p;
p = uns_c89_relo_init(ctx->tospace_alloc, len, is_record);
ctx->tospace_alloc = p + len;
return p;
}
/* Move an entire object pointed to by p from fromspace to tospace. */
static unsigned char *relocate(struct uns_gc *gc, unsigned char *p)
{
size_t l;
unsigned char *res;
struct ctx *ctx = gc->ctx;
if (!p)
return NULL;
res = uns_c89_relo_get_relo(p);
if (res)
return res;
l = uns_c89_relo_get_len(p);
res = raw_alloc(ctx, l, uns_c89_relo_is_record(p));
memcpy(res, p, l);
gc->after_collection += l;
uns_c89_relo_set_relo(p, res);
return res;
}
/* Scan each part of the record pointed to by "p" and relocate it. */
static void scan_record(struct uns_gc *gc, unsigned char *p)
{
size_t l = uns_c89_relo_get_record_len(p);
size_t i;
void *newp;
for (i = 0; i < l; i++) {
newp = relocate(gc, uns_c89_relo_record_get(p, i));
memcpy(p, &newp, sizeof(void *));
}
}
int uns_cheney_c89_collect(struct uns_gc *gc)
{
/* Save fromspace */
struct ctx *ctx = gc->ctx;
unsigned char *fromspace = ctx->tospace;
unsigned char *fromspace_lim = ctx->tospace_alloc;
unsigned char *scanptr;
size_t newlen = gc->next_alloc;
struct uns_root_list *root;
assert(gc->next_alloc >= fromspace_lim - fromspace);
/* Bail out immediately if allocation fails. This preserves
* the objects as they were.
*/
ctx->tospace = malloc(newlen);
if (!ctx->tospace) {
ctx->tospace = fromspace;
return 1;
}
/* Setup statistics */
gc->before_collection = fromspace_lim - fromspace;
gc->after_collection = 0;
gc->collection_number += 1;
ctx->tospace_end = ctx->tospace + newlen;
ctx->tospace_alloc = ctx->tospace;
/* Relocate roots */
for (root = gc->roots; root; root = root->next)
root->p = relocate(gc, root->p);
scanptr = ctx->tospace;
while (scanptr != ctx->tospace_alloc) {
if (uns_c89_relo_is_record(scanptr))
scan_record(gc, scanptr);
scanptr += uns_c89_relo_get_len(scanptr);
}
free(fromspace);
if (gc->after_gc)
gc->after_gc(gc);
return 1;
}
static void *alloc(struct uns_gc *gc, size_t bytes, int is_record)
{
struct ctx *ctx = gc->ctx;
if (ctx->tospace_end - ctx->tospace_alloc < bytes)
uns_cheney_c89_collect(gc);
if (ctx->tospace_end - ctx->tospace_alloc < bytes)
gc->oom(gc);
return raw_alloc(ctx, bytes, is_record);
}
void *uns_cheney_c89_alloc(struct uns_gc *gc, size_t bytes)
{
return alloc(gc, bytes, 0);
}
void *uns_cheney_c89_alloc_record(struct uns_gc *gc, size_t records)
{
size_t i;
unsigned char *res = alloc(gc, records*sizeof(void *), 1);
for (i = 0; i < records; i++)
uns_c89_relo_record_set(res, i, NULL);
return res;
}
int uns_cheney_c89_init(struct uns_gc *gc)
{
struct ctx *ctx = gc->ctx;
gc->deinit = uns_cheney_c89_deinit;
gc->collect = uns_cheney_c89_collect;
gc->alloc = uns_cheney_c89_alloc;
gc->alloc_record = uns_cheney_c89_alloc_record;
gc->len = uns_c89_relo_get_len;
gc->record_set_ptr = uns_c89_relo_record_set;
gc->record_get_ptr = uns_c89_relo_record_get;
zero_ctx(ctx);
ctx->tospace = malloc(gc->next_alloc);
if (!ctx->tospace)
return 0;
ctx->tospace_alloc = ctx->tospace;
ctx->tospace_end = ctx->tospace + gc->next_alloc;
return 1;
}

80
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/* Copyright (c) 2024, Peter McGoron
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1) Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2) Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdlib.h>
#include <stdio.h>
#include "uns.h"
#include "cheney_c89.h"
/* This file sets up the environment for a test.
*
* Each test is compiled as a separate program to isolate tests portably.
* A test suite is a shell script (or batch file or whatever you want...)
*/
static void oom(struct uns_gc *gc)
{
(void)gc;
fprintf(stderr, "failed: OOM\n");
exit(1);
}
static void after_gc(struct uns_gc *gc)
{
fprintf(stderr,
"The garbage collector has run %ld times\n"
"\tbefore collection: %lu\n"
"\tafter collection: %lu\n",
gc->collection_number,
gc->before_collection,
gc->after_collection
);
if (gc->after_collection >= gc->before_collection/2)
gc->next_alloc *= 2;
}
extern int test(struct uns_gc *gc);
int main(void)
{
static struct uns_gc gc;
int i;
gc.next_alloc = 1024;
gc.ctx = malloc(uns_cheney_c89_ctx_size);
gc.after_gc = after_gc;
gc.oom = oom;
if (!gc.ctx)
return 1;
if (!uns_cheney_c89_init(&gc))
return 2;
gc.next_alloc = 2048;
i = test(&gc);
gc.deinit(&gc);
return i;
}

77
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/* Copyright (c) 2024, Peter McGoron
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1) Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2) Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "uns.h"
#include "uns_string.h"
int test(struct uns_gc *gc)
{
struct uns_root_list r = {0};
size_t i;
/* MistralAI 8x7B 0.1:
* Prompt: "write a sonnet about garbage collectors (the memory management kind)"
*
* This string constant is larger than the standard's minimum. If
* this test doesn't compile, get a better compiler.
*/
const char s[] =
"To the humble garbagemen of code's dark night,\n"
"Who tread through bits and bytes with steady hand.\n"
"They roam the heap, in dimly lit sight,\n"
"And rescue order from chaos unplanned.\n"
"With algorithms precise and swift they glide,\n"
"Through malloc'd arrays and pointers vast.\n"
"Their work essential to keep programs wide,\n"
"From crashing down upon us too soon passed.\n"
"Yet often left unsung are these brave knights,\n"
"Whose vigilance keeps our software clean.\n"
"In shadows cast by CPUs might,\n"
"Unseen forces that make sense of unseen.\n"
"So here's to you, dear Garbage Collectors all,\n"
"Thank you for keeping coding dreams enthralled.\n"
;
uns_string_alloc_into(&gc, &r);
/* generate lots of garbage */
uns_string_alloc_into(&gc, &r);
uns_root_add(&gc, &r);
for (i = 0; i < 100; i++)
uns_string_append_bytes(&gc, &r, s, sizeof(s) - 1);
uns_root_remove(&gc, &r);
/* Generate lots of garbage by being inefficient. */
uns_string_alloc_into(&gc, &r);
uns_root_add(&gc, &r);
for (i = 0; i < sizeof(s) - 1; i++)
uns_string_append_char(&gc, &r, s[i]);
uns_root_remove(&gc, &r);
return 0;
}

44
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/* Copyright (c) 2024, Peter McGoron
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1) Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2) Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include "uns.h"
#include "uns_string.h"
int test(struct uns_gc *gc)
{
struct uns_root_list r = {0};
const char s[] = "hello, world";
uns_string_alloc(gc, &r, 32);
uns_root_add(gc, &r);
uns_string_append_bytes(gc, &r, s, sizeof(s) - 1);
printf("%s\n", uns_string_cstring(gc, &r));
uns_root_remove(gc, &r);
return 0;
}

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/* Copyright (c) 2024, Peter McGoron
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1) Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2) Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <string.h>
#include "uns.h"
#include "uns_string.h"
enum {
ALLEN_IND = 0,
LEN_IND = 1,
BYTES_IND = 2,
NUMBER_OF_IND = 3
};
static size_t get_size_t(struct uns_gc *gc, struct uns_root_list *root, size_t i)
{
size_t r;
void *p = gc->record_get_ptr(root->p, i);
memcpy(&r, p, sizeof(r));
return r;
}
static void set_size_t(struct uns_gc *gc, struct uns_root_list *root, size_t i, size_t val)
{
void *p = gc->record_get_ptr(root->p, i);
memcpy(p, &val, sizeof(val));
}
#define set_allen(gc,root,val) set_size_t(gc, root, ALLEN_IND, val)
#define set_len(gc,root,val) set_size_t(gc, root, LEN_IND, val)
static size_t uns_string_allen(struct uns_gc *gc, struct uns_root_list *root)
{
return get_size_t(gc, root, ALLEN_IND);
}
size_t uns_string_len(struct uns_gc *gc, struct uns_root_list *root)
{
return get_size_t(gc, root, LEN_IND);
}
char *uns_string_ptr(struct uns_gc *gc, struct uns_root_list *root)
{
return gc->record_get_ptr(root->p, BYTES_IND);
}
void uns_string_alloc(struct uns_gc *gc, struct uns_root_list *root, size_t start_len)
{
root->p = gc->alloc_record(gc, NUMBER_OF_IND);
gc->record_set_ptr(root->p, ALLEN_IND, gc->alloc(gc, sizeof(size_t)));
set_allen(gc, root, start_len);
gc->record_set_ptr(root->p, LEN_IND, gc->alloc(gc, sizeof(size_t)));
set_len(gc, root, 0);
gc->record_set_ptr(root->p, BYTES_IND, gc->alloc(gc, start_len));
}
void uns_string_resize(struct uns_gc *gc, struct uns_root_list *root, size_t newlen)
{
char *tmp;
tmp = gc->alloc(gc, newlen);
set_allen(gc, root, newlen);
if (newlen <= uns_string_len(gc, root))
set_len(gc, root, newlen);
memcpy(tmp, uns_string_ptr(gc, root), uns_string_len(gc, root));
}
void uns_string_ensure(struct uns_gc *gc, struct uns_root_list *root, size_t extent)
{
size_t used = uns_string_len(gc, root);
size_t allen = uns_string_allen(gc, root);
if (used + extent > allen)
uns_string_resize(gc, root, used + extent);
}
void uns_string_append_bytes(struct uns_gc *gc, struct uns_root_list *to,
const void *from, size_t bytes)
{
size_t len = uns_string_len(gc, to);
uns_string_ensure(gc, to, bytes);
memcpy(uns_string_ptr(gc, to) + len, from, bytes);
set_len(gc, to, len + bytes);
}
void uns_string_append_char(struct uns_gc *gc, struct uns_root_list *root, char c)
{
uns_string_append_bytes(gc, root, &c, 1);
}
char *uns_string_cstring(struct uns_gc *gc, struct uns_root_list *root)
{
char *p;
uns_string_ensure(gc, root, 1);
p = uns_string_ptr(gc, root);
p[uns_string_len(gc, root)] = 0;
return p;
}

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#ifndef UNS_STRING_H
#define UNS_STRING_H
/* Copyright (c) 2024, Peter McGoron
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1) Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2) Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "uns.h"
/* This code implements imperative strings. Imperative strings can be
* updated in-place. This requires storing the amount of memory left in
* the string, and the length of the string itself.
*
* String format:
* record: [slot 1] [slot 2] [slot 3]
* | | |
* size_t size_t bytes
* (allocated length) (used) (size of used)
*/
size_t uns_string_len(struct uns_gc *gc, struct uns_root_list *root);
char *uns_string_ptr(struct uns_gc *gc, struct uns_root_list *root);
/* The following functions may cause a collection. */
void uns_string_alloc(struct uns_gc *gc, struct uns_root_list *root, size_t start_len);
void uns_string_resize(struct uns_gc *gc, struct uns_root_list *root, size_t newlen);
void uns_string_ensure(struct uns_gc *gc, struct uns_root_list *root, size_t extent);
void uns_string_append_bytes(struct uns_gc *gc, struct uns_root_list *to,
const void *from, size_t bytes);
void uns_string_append_char(struct uns_gc *gc, struct uns_root_list *root, char c);
char *uns_string_cstring(struct uns_gc *gc, struct uns_root_list *root);
#endif

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/* Copyright (C) 2024 Peter McGoron
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#ifndef UNS_CHENEY_C89_H
#define UNS_CHENEY_C89_H
#include "uns.h"
/* Cheney copying collector in pure portable C89. */
void uns_cheney_c89_deinit(struct uns_gc *gc);
int uns_cheney_c89_init(struct uns_gc *gc);
int uns_cheney_c89_collect(struct uns_gc *gc);
void *uns_cheney_c89_alloc(struct uns_gc *gc, size_t bytes);
void *uns_cheney_c89_alloc_record(struct uns_gc *gc, size_t records);
const extern size_t uns_cheney_c89_ctx_size;
#endif

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#ifndef UNS_FORMAT_C89_H
#define UNS_FORMAT_C89_H
/* Copyright (C) 2024 Peter McGoron
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include "uns.h"
/* This is a strictly C89+ header format with relocation pointers and
* lengths.
*
* Forwarding pointers need to be stored in the header because in strict
* C, arithmetic on pointers is undefined for pointers not pointing into
* the same object.
*
* The length of the string is limited to "len" bytes and is stored as
* a `uns_sword`. If the word is negative, then the region is a record,
* and if the number is positive then the region is just bytes.
*/
struct uns_c89_relo_hdr {
void *relo;
uns_sword len;
};
#define uns_c89_relo_get_hdr(p)((struct uns_c89_relo_hdr *)(p) - 1)
size_t uns_c89_relo_get_len(void *p);
size_t uns_c89_relo_get_record_len(void *p);
#define uns_c89_relo_get_relo(p) (uns_c89_relo_get_hdr(p)->relo)
#define uns_c89_relo_set_relo(p, v) (uns_c89_relo_get_relo(p) = (v))
#define uns_c89_relo_is_record(p) (uns_c89_relo_get_hdr(p)->len < 0)
void *uns_c89_relo_init(void *p, size_t len_size, int is_record);
void uns_c89_relo_record_set(void *rec, size_t i, void *v);
void *uns_c89_relo_record_get(void *rec, size_t i);
#endif

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#ifndef UNIVERSAL_SERVICE_H
#define UNIVERSAL_SERVICE_H
/* Copyright (C) 2024 Peter McGoron
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include <stddef.h>
#if !defined(UNS_WORD) && __STDC_VERSION__ >= 199101L
# include <stdint.h>
# include <limits.h>
# define UNS_WORD uintptr_t
# define UNS_SIGNED_WORD intptr_t
# define UNS_WORD_MAX UINTPTR_MAX
# define UNS_SWORD_MAX INTPTR_MAX
# define UNS_SWORD_MIN INTPTR_MIN
#elif !defined(UNS_WORD)
# include <limits.h>
# define UNS_WORD unsigned long
# define UNS_WORD_MAX ULONG_MAX
# define UNS_SIGNED_WORD long
# define UNS_SWORD_MAX LONG_MAX
# define UNS_SWORD_MIN LONG_MIN
#endif
typedef UNS_WORD uns_word;
typedef UNS_SIGNED_WORD uns_sword;
/** Doubly linked list used to
*
* 1) Store roots of the GC,
* 2) Store GC pointers used in C and possibly not pointed-to anywhere
* else in GC space,
* 3) Preserve the location of a pointer after it moves.
*
* A root that is not a part of any GC MUST have ``prev`` and ``next``
* set to NULL.
*/
struct uns_root_list {
struct uns_root_list *prev;
void *p;
struct uns_root_list *next;
};
struct uns_gc {
void *ctx;
/* The collector only changes the pointer values of "p".
*
* * The collector never adds or removes roots.
* * The collector never rearranges the order of the container structures.
*
* The roots list can have repeated values.
*/
struct uns_root_list *roots;
size_t next_alloc;
void (*oom)(struct uns_gc *);
void (*after_gc)(struct uns_gc *);
size_t before_collection;
size_t after_collection;
long collection_number;
void (*deinit)(struct uns_gc *);
/* These functions, and only these functions, may invalidate
* pointers by either moving them or freeing them.
*/
int (*collect)(struct uns_gc *);
void *(*alloc)(struct uns_gc *, size_t);
void *(*alloc_record)(struct uns_gc *, size_t);
/* These functions MUST NOT cause collections. */
/* This function is optional. It is only provided if the GC can
* calculate the length of the pointer quickly.
*/
size_t (*len)(void *);
void (*record_set_ptr)(void *, size_t, void *);
void *(*record_get_ptr)(void *, size_t);
};
/** Add a root to the GC. The root must point to valid memory, or NULL. */
void uns_root_add(struct uns_gc *gc, struct uns_root_list *root);
/** Remove a root from the GC. It is OK to remove a root that is not a
* part of any GC using this function (the call will have no effect).
*/
void uns_root_remove(struct uns_gc *gc, struct uns_root_list *root);
#endif

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/* Copyright (C) 2024 Peter McGoron
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include "uns.h"
void uns_root_add(struct uns_gc *gc, struct uns_root_list *root)
{
root->prev = NULL;
root->next = gc->roots;
gc->roots = root;
}
void uns_root_remove(struct uns_gc *gc, struct uns_root_list *root)
{
if (root->prev) {
root->prev->next = root->next;
}
if (root->next) {
root->next->prev = root->prev;
}
if (gc->roots == root)
gc->roots = root->next;
root->prev = root->next = NULL;
}