mirror of
https://github.com/git/git.git
synced 2024-12-13 03:44:17 +08:00
5e3f94dfe3
Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
407 lines
8.2 KiB
C
407 lines
8.2 KiB
C
#include "test-tool.h"
|
||
#include "mem-pool.h"
|
||
#include "mergesort.h"
|
||
#include "strbuf.h"
|
||
|
||
static uint32_t minstd_rand(uint32_t *state)
|
||
{
|
||
*state = (uint64_t)*state * 48271 % 2147483647;
|
||
return *state;
|
||
}
|
||
|
||
struct line {
|
||
char *text;
|
||
struct line *next;
|
||
};
|
||
|
||
DEFINE_LIST_SORT(static, sort_lines, struct line, next);
|
||
|
||
static int compare_strings(const struct line *x, const struct line *y)
|
||
{
|
||
return strcmp(x->text, y->text);
|
||
}
|
||
|
||
static int sort_stdin(void)
|
||
{
|
||
struct line *lines;
|
||
struct line **tail = &lines;
|
||
struct strbuf sb = STRBUF_INIT;
|
||
struct mem_pool lines_pool;
|
||
char *p;
|
||
|
||
strbuf_read(&sb, 0, 0);
|
||
|
||
/*
|
||
* Split by newline, but don't create an item
|
||
* for the empty string after the last separator.
|
||
*/
|
||
if (sb.len && sb.buf[sb.len - 1] == '\n')
|
||
strbuf_setlen(&sb, sb.len - 1);
|
||
|
||
mem_pool_init(&lines_pool, 0);
|
||
p = sb.buf;
|
||
for (;;) {
|
||
char *eol = strchr(p, '\n');
|
||
struct line *line = mem_pool_alloc(&lines_pool, sizeof(*line));
|
||
line->text = p;
|
||
*tail = line;
|
||
tail = &line->next;
|
||
if (!eol)
|
||
break;
|
||
*eol = '\0';
|
||
p = eol + 1;
|
||
}
|
||
*tail = NULL;
|
||
|
||
sort_lines(&lines, compare_strings);
|
||
|
||
while (lines) {
|
||
puts(lines->text);
|
||
lines = lines->next;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
static void dist_sawtooth(int *arr, int n, int m)
|
||
{
|
||
int i;
|
||
for (i = 0; i < n; i++)
|
||
arr[i] = i % m;
|
||
}
|
||
|
||
static void dist_rand(int *arr, int n, int m)
|
||
{
|
||
int i;
|
||
uint32_t seed = 1;
|
||
for (i = 0; i < n; i++)
|
||
arr[i] = minstd_rand(&seed) % m;
|
||
}
|
||
|
||
static void dist_stagger(int *arr, int n, int m)
|
||
{
|
||
int i;
|
||
for (i = 0; i < n; i++)
|
||
arr[i] = (i * m + i) % n;
|
||
}
|
||
|
||
static void dist_plateau(int *arr, int n, int m)
|
||
{
|
||
int i;
|
||
for (i = 0; i < n; i++)
|
||
arr[i] = (i < m) ? i : m;
|
||
}
|
||
|
||
static void dist_shuffle(int *arr, int n, int m)
|
||
{
|
||
int i, j, k;
|
||
uint32_t seed = 1;
|
||
for (i = j = 0, k = 1; i < n; i++)
|
||
arr[i] = minstd_rand(&seed) % m ? (j += 2) : (k += 2);
|
||
}
|
||
|
||
#define DIST(name) { #name, dist_##name }
|
||
|
||
static struct dist {
|
||
const char *name;
|
||
void (*fn)(int *arr, int n, int m);
|
||
} dist[] = {
|
||
DIST(sawtooth),
|
||
DIST(rand),
|
||
DIST(stagger),
|
||
DIST(plateau),
|
||
DIST(shuffle),
|
||
};
|
||
|
||
static const struct dist *get_dist_by_name(const char *name)
|
||
{
|
||
int i;
|
||
for (i = 0; i < ARRAY_SIZE(dist); i++) {
|
||
if (!strcmp(dist[i].name, name))
|
||
return &dist[i];
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
static void mode_copy(int *arr, int n)
|
||
{
|
||
/* nothing */
|
||
}
|
||
|
||
static void mode_reverse(int *arr, int n)
|
||
{
|
||
int i, j;
|
||
for (i = 0, j = n - 1; i < j; i++, j--)
|
||
SWAP(arr[i], arr[j]);
|
||
}
|
||
|
||
static void mode_reverse_1st_half(int *arr, int n)
|
||
{
|
||
mode_reverse(arr, n / 2);
|
||
}
|
||
|
||
static void mode_reverse_2nd_half(int *arr, int n)
|
||
{
|
||
int half = n / 2;
|
||
mode_reverse(arr + half, n - half);
|
||
}
|
||
|
||
static int compare_ints(const void *av, const void *bv)
|
||
{
|
||
const int *ap = av, *bp = bv;
|
||
int a = *ap, b = *bp;
|
||
return (a > b) - (a < b);
|
||
}
|
||
|
||
static void mode_sort(int *arr, int n)
|
||
{
|
||
QSORT(arr, n, compare_ints);
|
||
}
|
||
|
||
static void mode_dither(int *arr, int n)
|
||
{
|
||
int i;
|
||
for (i = 0; i < n; i++)
|
||
arr[i] += i % 5;
|
||
}
|
||
|
||
static void unriffle(int *arr, int n, int *tmp)
|
||
{
|
||
int i, j;
|
||
COPY_ARRAY(tmp, arr, n);
|
||
for (i = j = 0; i < n; i += 2)
|
||
arr[j++] = tmp[i];
|
||
for (i = 1; i < n; i += 2)
|
||
arr[j++] = tmp[i];
|
||
}
|
||
|
||
static void unriffle_recursively(int *arr, int n, int *tmp)
|
||
{
|
||
if (n > 1) {
|
||
int half = n / 2;
|
||
unriffle(arr, n, tmp);
|
||
unriffle_recursively(arr, half, tmp);
|
||
unriffle_recursively(arr + half, n - half, tmp);
|
||
}
|
||
}
|
||
|
||
static void mode_unriffle(int *arr, int n)
|
||
{
|
||
int *tmp;
|
||
ALLOC_ARRAY(tmp, n);
|
||
unriffle_recursively(arr, n, tmp);
|
||
free(tmp);
|
||
}
|
||
|
||
static unsigned int prev_pow2(unsigned int n)
|
||
{
|
||
unsigned int pow2 = 1;
|
||
while (pow2 * 2 < n)
|
||
pow2 *= 2;
|
||
return pow2;
|
||
}
|
||
|
||
static void unriffle_recursively_skewed(int *arr, int n, int *tmp)
|
||
{
|
||
if (n > 1) {
|
||
int pow2 = prev_pow2(n);
|
||
int rest = n - pow2;
|
||
unriffle(arr + pow2 - rest, rest * 2, tmp);
|
||
unriffle_recursively_skewed(arr, pow2, tmp);
|
||
unriffle_recursively_skewed(arr + pow2, rest, tmp);
|
||
}
|
||
}
|
||
|
||
static void mode_unriffle_skewed(int *arr, int n)
|
||
{
|
||
int *tmp;
|
||
ALLOC_ARRAY(tmp, n);
|
||
unriffle_recursively_skewed(arr, n, tmp);
|
||
free(tmp);
|
||
}
|
||
|
||
#define MODE(name) { #name, mode_##name }
|
||
|
||
static struct mode {
|
||
const char *name;
|
||
void (*fn)(int *arr, int n);
|
||
} mode[] = {
|
||
MODE(copy),
|
||
MODE(reverse),
|
||
MODE(reverse_1st_half),
|
||
MODE(reverse_2nd_half),
|
||
MODE(sort),
|
||
MODE(dither),
|
||
MODE(unriffle),
|
||
MODE(unriffle_skewed),
|
||
};
|
||
|
||
static const struct mode *get_mode_by_name(const char *name)
|
||
{
|
||
int i;
|
||
for (i = 0; i < ARRAY_SIZE(mode); i++) {
|
||
if (!strcmp(mode[i].name, name))
|
||
return &mode[i];
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
static int generate(int argc, const char **argv)
|
||
{
|
||
const struct dist *dist = NULL;
|
||
const struct mode *mode = NULL;
|
||
int i, n, m, *arr;
|
||
|
||
if (argc != 4)
|
||
return 1;
|
||
|
||
dist = get_dist_by_name(argv[0]);
|
||
mode = get_mode_by_name(argv[1]);
|
||
n = strtol(argv[2], NULL, 10);
|
||
m = strtol(argv[3], NULL, 10);
|
||
if (!dist || !mode)
|
||
return 1;
|
||
|
||
ALLOC_ARRAY(arr, n);
|
||
dist->fn(arr, n, m);
|
||
mode->fn(arr, n);
|
||
for (i = 0; i < n; i++)
|
||
printf("%08x\n", arr[i]);
|
||
free(arr);
|
||
return 0;
|
||
}
|
||
|
||
static struct stats {
|
||
int get_next, set_next, compare;
|
||
} stats;
|
||
|
||
struct number {
|
||
int value, rank;
|
||
struct number *next;
|
||
};
|
||
|
||
DEFINE_LIST_SORT_DEBUG(static, sort_numbers, struct number, next,
|
||
stats.get_next++, stats.set_next++);
|
||
|
||
static int compare_numbers(const struct number *an, const struct number *bn)
|
||
{
|
||
int a = an->value, b = bn->value;
|
||
stats.compare++;
|
||
return (a > b) - (a < b);
|
||
}
|
||
|
||
static void clear_numbers(struct number *list)
|
||
{
|
||
while (list) {
|
||
struct number *next = list->next;
|
||
free(list);
|
||
list = next;
|
||
}
|
||
}
|
||
|
||
static int test(const struct dist *dist, const struct mode *mode, int n, int m)
|
||
{
|
||
int *arr;
|
||
size_t i;
|
||
struct number *curr, *list, **tail;
|
||
int is_sorted = 1;
|
||
int is_stable = 1;
|
||
const char *verdict;
|
||
int result = -1;
|
||
|
||
ALLOC_ARRAY(arr, n);
|
||
dist->fn(arr, n, m);
|
||
mode->fn(arr, n);
|
||
for (i = 0, tail = &list; i < n; i++) {
|
||
curr = xmalloc(sizeof(*curr));
|
||
curr->value = arr[i];
|
||
curr->rank = i;
|
||
*tail = curr;
|
||
tail = &curr->next;
|
||
}
|
||
*tail = NULL;
|
||
|
||
stats.get_next = stats.set_next = stats.compare = 0;
|
||
sort_numbers(&list, compare_numbers);
|
||
|
||
QSORT(arr, n, compare_ints);
|
||
for (i = 0, curr = list; i < n && curr; i++, curr = curr->next) {
|
||
if (arr[i] != curr->value)
|
||
is_sorted = 0;
|
||
if (curr->next && curr->value == curr->next->value &&
|
||
curr->rank >= curr->next->rank)
|
||
is_stable = 0;
|
||
}
|
||
if (i < n) {
|
||
verdict = "too short";
|
||
} else if (curr) {
|
||
verdict = "too long";
|
||
} else if (!is_sorted) {
|
||
verdict = "not sorted";
|
||
} else if (!is_stable) {
|
||
verdict = "unstable";
|
||
} else {
|
||
verdict = "OK";
|
||
result = 0;
|
||
}
|
||
|
||
printf("%-9s %-16s %8d %8d %8d %8d %8d %s\n",
|
||
dist->name, mode->name, n, m, stats.get_next, stats.set_next,
|
||
stats.compare, verdict);
|
||
|
||
clear_numbers(list);
|
||
free(arr);
|
||
|
||
return result;
|
||
}
|
||
|
||
/*
|
||
* A version of the qsort certification program from "Engineering a Sort
|
||
* Function" by Bentley and McIlroy, Software—Practice and Experience,
|
||
* Volume 23, Issue 11, 1249–1265 (November 1993).
|
||
*/
|
||
static int run_tests(int argc, const char **argv)
|
||
{
|
||
const char *argv_default[] = { "100", "1023", "1024", "1025" };
|
||
if (!argc)
|
||
return run_tests(ARRAY_SIZE(argv_default), argv_default);
|
||
printf("%-9s %-16s %8s %8s %8s %8s %8s %s\n",
|
||
"distribut", "mode", "n", "m", "get_next", "set_next",
|
||
"compare", "verdict");
|
||
while (argc--) {
|
||
int i, j, m, n = strtol(*argv++, NULL, 10);
|
||
for (i = 0; i < ARRAY_SIZE(dist); i++) {
|
||
for (j = 0; j < ARRAY_SIZE(mode); j++) {
|
||
for (m = 1; m < 2 * n; m *= 2) {
|
||
if (test(&dist[i], &mode[j], n, m))
|
||
return 1;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
int cmd__mergesort(int argc, const char **argv)
|
||
{
|
||
int i;
|
||
const char *sep;
|
||
|
||
if (argc == 6 && !strcmp(argv[1], "generate"))
|
||
return generate(argc - 2, argv + 2);
|
||
if (argc == 2 && !strcmp(argv[1], "sort"))
|
||
return sort_stdin();
|
||
if (argc > 1 && !strcmp(argv[1], "test"))
|
||
return run_tests(argc - 2, argv + 2);
|
||
fprintf(stderr, "usage: test-tool mergesort generate <distribution> <mode> <n> <m>\n");
|
||
fprintf(stderr, " or: test-tool mergesort sort\n");
|
||
fprintf(stderr, " or: test-tool mergesort test [<n>...]\n");
|
||
fprintf(stderr, "\n");
|
||
for (i = 0, sep = "distributions: "; i < ARRAY_SIZE(dist); i++, sep = ", ")
|
||
fprintf(stderr, "%s%s", sep, dist[i].name);
|
||
fprintf(stderr, "\n");
|
||
for (i = 0, sep = "modes: "; i < ARRAY_SIZE(mode); i++, sep = ", ")
|
||
fprintf(stderr, "%s%s", sep, mode[i].name);
|
||
fprintf(stderr, "\n");
|
||
return 129;
|
||
}
|