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dpkg: reduce bss usage by ~130 kbytes (yes, kilobytes!)

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at the cost of ~100 bytes of text.
Improves friendliness to nommu systems.
(Dunno whether nommu people ever use dpkg, though...)
This commit is contained in:
Denis Vlasenko 2006-09-28 22:34:46 +00:00
parent 06b543b217
commit 57308afb5b
2 changed files with 91 additions and 80 deletions
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169
archival/dpkg.c
View File

@ -42,7 +42,6 @@
* I estimate it should be at least 50% bigger than PACKAGE_HASH_PRIME,
* as there a lot of duplicate version numbers */
#define NAME_HASH_PRIME 16381
static char *name_hashtable[NAME_HASH_PRIME + 1];
/* PACKAGE_HASH_PRIME, Maximum number of unique packages,
* It must not be smaller than STATUS_HASH_PRIME,
@ -66,7 +65,6 @@ typedef struct common_node_s {
unsigned int num_of_edges:14;
edge_t **edge;
} common_node_t;
static common_node_t *package_hashtable[PACKAGE_HASH_PRIME + 1];
/* Currently it doesnt store packages that have state-status of not-installed
* So it only really has to be the size of the maximum number of packages
@ -76,7 +74,11 @@ typedef struct status_node_s {
unsigned int package:14; /* has to fit PACKAGE_HASH_PRIME */
unsigned int status:14; /* has to fit STATUS_HASH_PRIME */
} status_node_t;
static status_node_t *status_hashtable[STATUS_HASH_PRIME + 1];
/* Were statically declared here, but such a big bss is nommu-unfriendly */
static char **name_hashtable; /* [NAME_HASH_PRIME + 1] */
static common_node_t **package_hashtable; /* [PACKAGE_HASH_PRIME + 1] */
static status_node_t **status_hashtable; /* [STATUS_HASH_PRIME + 1] */
/* Even numbers are for 'extras', like ored dependencies or null */
enum edge_type_e {
@ -129,7 +131,7 @@ static void make_hash(const char *key, unsigned int *start, unsigned int *decrem
/* Maybe i should have uses a "proper" hashing algorithm here instead
* of making one up myself, seems to be working ok though. */
for(i = 1; i < len; i++) {
for (i = 1; i < len; i++) {
/* shifts the ascii based value and adds it to previous value
* shift amount is mod 24 because long int is 32 bit and data
* to be shifted is 8, don't want to shift data to where it has
@ -148,7 +150,7 @@ static int search_name_hashtable(const char *key)
// char *temp;
make_hash(key, &probe_address, &probe_decrement, NAME_HASH_PRIME);
while(name_hashtable[probe_address] != NULL) {
while (name_hashtable[probe_address] != NULL) {
if (strcmp(name_hashtable[probe_address], key) == 0) {
return(probe_address);
} else {
@ -171,7 +173,7 @@ static unsigned int search_status_hashtable(const char *key)
unsigned int probe_decrement = 0;
make_hash(key, &probe_address, &probe_decrement, STATUS_HASH_PRIME);
while(status_hashtable[probe_address] != NULL) {
while (status_hashtable[probe_address] != NULL) {
if (strcmp(key, name_hashtable[package_hashtable[status_hashtable[probe_address]->package]->name]) == 0) {
break;
} else {
@ -356,7 +358,7 @@ static int search_package_hashtable(const unsigned int name, const unsigned int
unsigned int probe_decrement = 0;
make_hash(name_hashtable[name], &probe_address, &probe_decrement, PACKAGE_HASH_PRIME);
while(package_hashtable[probe_address] != NULL) {
while (package_hashtable[probe_address] != NULL) {
if (package_hashtable[probe_address]->name == name) {
if (operator == VER_ANY) {
return(probe_address);
@ -394,9 +396,9 @@ static int search_for_provides(int needle, int start_at) {
common_node_t *p;
for (i = start_at + 1; i < PACKAGE_HASH_PRIME; i++) {
p = package_hashtable[i];
if ( p == NULL ) continue;
for(j = 0; j < p->num_of_edges; j++)
if ( p->edge[j]->type == EDGE_PROVIDES && p->edge[j]->name == needle )
if (p == NULL) continue;
for (j = 0; j < p->num_of_edges; j++)
if (p->edge[j]->type == EDGE_PROVIDES && p->edge[j]->name == needle)
return i;
}
return -1;
@ -441,15 +443,15 @@ static void add_split_dependencies(common_node_t *parent_node, const char *whole
field += strspn(field, " ");
line2 = xstrdup(field);
field2 = strtok_r(line2, "|", &line_ptr2);
if ( (edge_type == EDGE_DEPENDS || edge_type == EDGE_PRE_DEPENDS) &&
(strcmp(field, field2) != 0)) {
if ((edge_type == EDGE_DEPENDS || edge_type == EDGE_PRE_DEPENDS) &&
(strcmp(field, field2) != 0)) {
or_edge = (edge_t *)xmalloc(sizeof(edge_t));
or_edge->type = edge_type + 1;
} else {
or_edge = NULL;
}
if ( or_edge ) {
if (or_edge) {
or_edge->name = search_name_hashtable(field);
or_edge->version = 0; // tracks the number of altenatives
@ -492,7 +494,7 @@ static void add_split_dependencies(common_node_t *parent_node, const char *whole
else if (strncmp(version, ">=", offset_ch) == 0) {
edge->operator = VER_MORE_EQUAL;
} else {
bb_error_msg_and_die("Illegal operator");
bb_error_msg_and_die("illegal operator");
}
}
/* skip to start of version numbers */
@ -509,7 +511,7 @@ static void add_split_dependencies(common_node_t *parent_node, const char *whole
field2[strcspn(field2, " (")] = '\0';
edge->name = search_name_hashtable(field2);
if ( or_edge )
if (or_edge)
or_edge->version++;
add_edge_to_node(parent_node, edge);
@ -756,23 +758,23 @@ static void set_status(const unsigned int status_node_num, const char *new_value
static const char *describe_status(int status_num) {
int status_want, status_state ;
if ( status_hashtable[status_num] == NULL || status_hashtable[status_num]->status == 0 )
if (status_hashtable[status_num] == NULL || status_hashtable[status_num]->status == 0)
return "is not installed or flagged to be installed\n";
status_want = get_status(status_num, 1);
status_state = get_status(status_num, 3);
if ( status_state == search_name_hashtable("installed") ) {
if ( status_want == search_name_hashtable("install") )
if (status_state == search_name_hashtable("installed")) {
if (status_want == search_name_hashtable("install"))
return "is installed";
if ( status_want == search_name_hashtable("deinstall") )
if (status_want == search_name_hashtable("deinstall"))
return "is marked to be removed";
if ( status_want == search_name_hashtable("purge") )
if (status_want == search_name_hashtable("purge"))
return "is marked to be purged";
}
if ( status_want == search_name_hashtable("unknown") )
if (status_want == search_name_hashtable("unknown"))
return "is in an indeterminate state";
if ( status_want == search_name_hashtable("install") )
if (status_want == search_name_hashtable("install"))
return "is marked to be installed";
return "is not installed or flagged to be installed";
@ -873,7 +875,7 @@ static void write_status_file(deb_file_t **deb_file)
(strcmp("unpacked", name_hashtable[state_status]) == 0)) {
/* We need to add the control file from the package */
i = 0;
while(deb_file[i] != NULL) {
while (deb_file[i] != NULL) {
if (strcmp(package_name, name_hashtable[package_hashtable[deb_file[i]->package]->name]) == 0) {
/* Write a status file entry with a modified status */
/* remove trailing \n's */
@ -942,7 +944,7 @@ static void write_status_file(deb_file_t **deb_file)
}
/* Write any new packages */
for(i = 0; deb_file[i] != NULL; i++) {
for (i = 0; deb_file[i] != NULL; i++) {
status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[i]->package]->name]);
if (strcmp("reinstreq", name_hashtable[get_status(status_num, 2)]) == 0) {
write_buffer_no_status(new_status_file, deb_file[i]->control_file);
@ -960,11 +962,11 @@ static void write_status_file(deb_file_t **deb_file)
xstat("/var/lib/dpkg/status", &stat_buf);
/* Its ok if renaming the status file fails because status
* file doesnt exist, maybe we are starting from scratch */
bb_error_msg("No status file found, creating new one");
bb_error_msg("no status file found, creating new one");
}
if (rename("/var/lib/dpkg/status.udeb", "/var/lib/dpkg/status") == -1) {
bb_error_msg_and_die("DANGER: Couldnt create status file, you need to manually repair your status file");
bb_error_msg_and_die("DANGER: Cannot create status file, you need to manually repair your status file");
}
}
@ -982,7 +984,7 @@ static int package_satisfies_dependency(int package, int depend_type)
/* status could be unknown if package is a pure virtual
* provides which cannot satisfy any dependency by itself.
*/
if ( status_hashtable[status_num] == NULL )
if (status_hashtable[status_num] == NULL)
return 0;
switch (depend_type) {
@ -1066,7 +1068,7 @@ static int check_deps(deb_file_t **deb_file, int deb_start, int dep_max_count)
}
if (result) {
bb_error_msg_and_die("Package %s conflicts with %s",
bb_error_msg_and_die("package %s conflicts with %s",
name_hashtable[package_node->name],
name_hashtable[package_edge->name]);
}
@ -1087,7 +1089,7 @@ static int check_deps(deb_file_t **deb_file, int deb_start, int dep_max_count)
* package is a virtual one. In which case there are
* no dependencies to check.
*/
if ( package_node == NULL ) continue;
if (package_node == NULL) continue;
status_num = search_status_hashtable(name_hashtable[package_node->name]);
@ -1095,7 +1097,7 @@ static int check_deps(deb_file_t **deb_file, int deb_start, int dep_max_count)
* virtual one provided by something else. In which
* case there are no dependencies to check.
*/
if ( status_hashtable[status_num] == NULL ) continue;
if (status_hashtable[status_num] == NULL) continue;
/* If we don't want this package installed then we may
* as well ignore it's dependencies.
@ -1112,12 +1114,12 @@ static int check_deps(deb_file_t **deb_file, int deb_start, int dep_max_count)
const edge_t *package_edge = package_node->edge[j];
unsigned int package_num;
if ( package_edge->type == EDGE_OR_PRE_DEPENDS ||
package_edge->type == EDGE_OR_DEPENDS ) { /* start an EDGE_OR_ list */
if (package_edge->type == EDGE_OR_PRE_DEPENDS ||
package_edge->type == EDGE_OR_DEPENDS) { /* start an EDGE_OR_ list */
number_of_alternatives = package_edge->version;
root_of_alternatives = package_edge;
continue;
} else if ( number_of_alternatives == 0 ) { /* not in the middle of an EDGE_OR_ list */
} else if (number_of_alternatives == 0) { /* not in the middle of an EDGE_OR_ list */
number_of_alternatives = 1;
root_of_alternatives = NULL;
}
@ -1125,7 +1127,7 @@ static int check_deps(deb_file_t **deb_file, int deb_start, int dep_max_count)
package_num = search_package_hashtable(package_edge->name, package_edge->version, package_edge->operator);
if (package_edge->type == EDGE_PRE_DEPENDS ||
package_edge->type == EDGE_DEPENDS ) {
package_edge->type == EDGE_DEPENDS) {
int result=1;
status_num = 0;
@ -1135,8 +1137,8 @@ static int check_deps(deb_file_t **deb_file, int deb_start, int dep_max_count)
* EDGE_DEPENDS == OR_DEPENDS -1
* EDGE_PRE_DEPENDS == OR_PRE_DEPENDS -1
*/
if ( root_of_alternatives && package_edge->type != root_of_alternatives->type - 1)
bb_error_msg_and_die("Fatal error. Package dependencies corrupt: %d != %d - 1",
if (root_of_alternatives && package_edge->type != root_of_alternatives->type - 1)
bb_error_msg_and_die("fatal error, package dependencies corrupt: %d != %d - 1",
package_edge->type, root_of_alternatives->type);
if (package_hashtable[package_num] != NULL)
@ -1145,14 +1147,14 @@ static int check_deps(deb_file_t **deb_file, int deb_start, int dep_max_count)
if (result) { /* check for other package which provide what we are looking for */
int provider = -1;
while ( (provider = search_for_provides(package_edge->name, provider) ) > -1 ) {
if ( package_hashtable[provider] == NULL ) {
printf("Have a provider but no package information for it\n");
while ((provider = search_for_provides(package_edge->name, provider)) > -1) {
if (package_hashtable[provider] == NULL) {
puts("Have a provider but no package information for it");
continue;
}
result = !package_satisfies_dependency(provider, package_edge->type);
if ( result == 0 )
if (result == 0)
break;
}
}
@ -1160,21 +1162,21 @@ static int check_deps(deb_file_t **deb_file, int deb_start, int dep_max_count)
/* It must be already installed, or to be installed */
number_of_alternatives--;
if (result && number_of_alternatives == 0) {
if ( root_of_alternatives )
if (root_of_alternatives)
bb_error_msg_and_die(
"Package %s %sdepends on %s, "
"package %s %sdepends on %s, "
"which cannot be satisfied",
name_hashtable[package_node->name],
package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
name_hashtable[root_of_alternatives->name]);
else
bb_error_msg_and_die(
"Package %s %sdepends on %s, which %s\n",
"package %s %sdepends on %s, which %s\n",
name_hashtable[package_node->name],
package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
name_hashtable[package_edge->name],
describe_status(status_num));
} else if ( result == 0 && number_of_alternatives ) {
} else if (result == 0 && number_of_alternatives) {
/* we've found a package which
* satisfies the dependency,
* so skip over the rest of
@ -1310,8 +1312,8 @@ static void list_packages(void)
{
int i;
printf(" Name Version\n");
printf("+++-==============-==============\n");
puts(" Name Version");
puts("+++-==============-==============");
/* go through status hash, dereference package hash and finally strings */
for (i=0; i<STATUS_HASH_PRIME+1; i++) {
@ -1355,8 +1357,8 @@ static void remove_package(const unsigned int package_num, int noisy)
char conffile_name[package_name_length + 30];
int return_value;
if ( noisy )
printf("Removing %s (%s) ...\n", package_name, package_version);
if (noisy)
printf("Removing %s (%s)...\n", package_name, package_version);
/* run prerm script */
return_value = run_package_script(package_name, "prerm");
@ -1404,7 +1406,7 @@ static void purge_package(const unsigned int package_num)
char **exclude_files;
char list_name[strlen(package_name) + 25];
printf("Purging %s (%s) ...\n", package_name, package_version);
printf("Purging %s (%s)...\n", package_name, package_version);
/* run prerm script */
if (run_package_script(package_name, "prerm") != 0) {
@ -1531,12 +1533,12 @@ static void unpack_package(deb_file_t *deb_file)
/* If existing version, remove it first */
if (strcmp(name_hashtable[get_status(status_num, 3)], "installed") == 0) {
/* Package is already installed, remove old version first */
printf("Preparing to replace %s %s (using %s) ...\n", package_name,
printf("Preparing to replace %s %s (using %s)...\n", package_name,
name_hashtable[package_hashtable[status_package_num]->version],
deb_file->filename);
remove_package(status_package_num, 0);
} else {
printf("Unpacking %s (from %s) ...\n", package_name, deb_file->filename);
printf("Unpacking %s (from %s)...\n", package_name, deb_file->filename);
}
/* Extract control.tar.gz to /var/lib/dpkg/info/<package>.filename */
@ -1544,7 +1546,7 @@ static void unpack_package(deb_file_t *deb_file)
archive_handle = init_archive_deb_ar(deb_file->filename);
init_archive_deb_control(archive_handle);
while(all_control_files[i]) {
while (all_control_files[i]) {
char *c = xasprintf("./%s", all_control_files[i]);
llist_add_to(&accept_list, c);
i++;
@ -1559,7 +1561,7 @@ static void unpack_package(deb_file_t *deb_file)
/* Run the preinst prior to extracting */
if (run_package_script(package_name, "preinst") != 0) {
/* when preinst returns exit code != 0 then quit installation process */
bb_error_msg_and_die("subprocess pre-installation script returned error.");
bb_error_msg_and_die("subprocess pre-installation script returned error");
}
/* Extract data.tar.gz to the root directory */
@ -1595,7 +1597,7 @@ static void configure_package(deb_file_t *deb_file)
const char *package_version = name_hashtable[package_hashtable[deb_file->package]->version];
const int status_num = search_status_hashtable(package_name);
printf("Setting up %s (%s) ...\n", package_name, package_version);
printf("Setting up %s (%s)...\n", package_name, package_version);
/* Run the postinst script */
if (run_package_script(package_name, "postinst") != 0) {
@ -1619,6 +1621,10 @@ int dpkg_main(int argc, char **argv)
int status_num;
int i;
name_hashtable = xzalloc(sizeof(name_hashtable[0]) * (NAME_HASH_PRIME + 1));
package_hashtable = xzalloc(sizeof(package_hashtable[0]) * (PACKAGE_HASH_PRIME + 1));
status_hashtable = xzalloc(sizeof(status_hashtable[0]) * (STATUS_HASH_PRIME + 1));
while ((opt = getopt(argc, argv, "CF:ilPru")) != -1) {
switch (opt) {
case 'C': // equivalent to --configure in official dpkg
@ -1682,13 +1688,13 @@ int dpkg_main(int argc, char **argv)
init_archive_deb_control(archive_handle);
deb_file[deb_count]->control_file = deb_extract_control_file_to_buffer(archive_handle, control_list);
if (deb_file[deb_count]->control_file == NULL) {
bb_error_msg_and_die("Couldnt extract control file");
bb_error_msg_and_die("cannot extract control file");
}
deb_file[deb_count]->filename = xstrdup(argv[optind]);
package_num = fill_package_struct(deb_file[deb_count]->control_file);
if (package_num == -1) {
bb_error_msg("Invalid control file in %s", argv[optind]);
bb_error_msg("invalid control file in %s", argv[optind]);
optind++;
continue;
}
@ -1718,7 +1724,7 @@ int dpkg_main(int argc, char **argv)
search_name_hashtable(argv[optind]),
search_name_hashtable("ANY"), VER_ANY);
if (package_hashtable[deb_file[deb_count]->package] == NULL) {
bb_error_msg_and_die("Package %s is uninstalled or unknown", argv[optind]);
bb_error_msg_and_die("package %s is uninstalled or unknown", argv[optind]);
}
package_num = deb_file[deb_count]->package;
status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
@ -1728,14 +1734,14 @@ int dpkg_main(int argc, char **argv)
if (dpkg_opt & dpkg_opt_remove) {
if ((strcmp(name_hashtable[state_status], "not-installed") == 0) ||
(strcmp(name_hashtable[state_status], "config-files") == 0)) {
bb_error_msg_and_die("%s is already removed.", name_hashtable[package_hashtable[package_num]->name]);
bb_error_msg_and_die("%s is already removed", name_hashtable[package_hashtable[package_num]->name]);
}
set_status(status_num, "deinstall", 1);
}
else if (dpkg_opt & dpkg_opt_purge) {
/* if package status is "conf-files" then its ok */
if (strcmp(name_hashtable[state_status], "not-installed") == 0) {
bb_error_msg_and_die("%s is already purged.", name_hashtable[package_hashtable[package_num]->name]);
bb_error_msg_and_die("%s is already purged", name_hashtable[package_hashtable[package_num]->name]);
}
set_status(status_num, "purge", 1);
}
@ -1748,7 +1754,7 @@ int dpkg_main(int argc, char **argv)
/* Check that the deb file arguments are installable */
if ((dpkg_opt & dpkg_opt_force_ignore_depends) != dpkg_opt_force_ignore_depends) {
if (!check_deps(deb_file, 0, deb_count)) {
bb_error_msg_and_die("Dependency check failed");
bb_error_msg_and_die("dependency check failed");
}
}
@ -1780,28 +1786,33 @@ int dpkg_main(int argc, char **argv)
write_status_file(deb_file);
for (i = 0; i < deb_count; i++) {
free(deb_file[i]->control_file);
free(deb_file[i]->filename);
free(deb_file[i]);
}
free(deb_file);
for (i = 0; i < NAME_HASH_PRIME; i++) {
free(name_hashtable[i]);
}
for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
if (package_hashtable[i] != NULL) {
free_package(package_hashtable[i]);
if (ENABLE_FEATURE_CLEAN_UP) {
for (i = 0; i < deb_count; i++) {
free(deb_file[i]->control_file);
free(deb_file[i]->filename);
free(deb_file[i]);
}
}
for (i = 0; i < STATUS_HASH_PRIME; i++) {
free(status_hashtable[i]);
free(deb_file);
for (i = 0; i < NAME_HASH_PRIME; i++) {
free(name_hashtable[i]);
}
for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
if (package_hashtable[i] != NULL) {
free_package(package_hashtable[i]);
}
}
for (i = 0; i < STATUS_HASH_PRIME; i++) {
free(status_hashtable[i]);
}
free(status_hashtable);
free(package_hashtable);
free(name_hashtable);
}
return(EXIT_SUCCESS);
}

2
scripts/objsizes
View File

@ -4,4 +4,4 @@ printf "%9s %11s %9s %9s %s\n" "text+data" text+rodata rwdata bss filename
find -name '*.o' | sed 's:^\./::' | xargs size | grep '^ *[0-9]' \
| while read text data bss dec hex filename; do
printf "%9d %11d %9d %9d %s\n" $((text+data)) $text $data $bss "$filename"
done
done | sort -r