git.ozlabs.org Git - ccan/blob - tools/ccanlint/tests/reduce_features.c

   1 #include <tools/ccanlint/ccanlint.h>
   2 #include <tools/tools.h>
   3 #include <ccan/htable/htable_type.h>
   4 #include <ccan/foreach/foreach.h>
   5 #include <ccan/talloc/talloc.h>
   6 #include <ccan/str/str.h>
   7 #include <ccan/str_talloc/str_talloc.h>
   8 #include <ccan/hash/hash.h>
   9 #include <ccan/read_write_all/read_write_all.h>
  10 #include <errno.h>
  11 #include <err.h>
  12 #include <sys/types.h>
  13 #include <sys/stat.h>
  14 #include <fcntl.h>
  15 #include <unistd.h>
  16 #include "reduce_features.h"
  17
  18 bool features_were_reduced;
  19
  20 static const char *can_run(struct manifest *m)
  21 {
  22         if (!config_header)
  23                 return talloc_strdup(m, "Could not read config.h");
  24         return NULL;
  25 }
  26
  27 static size_t option_hash(const char *name)
  28 {
  29         return hash(name, strlen(name), 0);
  30 }
  31
  32 static const char *option_name(const char *name)
  33 {
  34         return name;
  35 }
  36
  37 static bool option_cmp(const char *name1, const char *name2)
  38 {
  39         return streq(name1, name2);
  40 }
  41
  42 HTABLE_DEFINE_TYPE(char, option_name, option_hash, option_cmp, htable_option);
  43
  44 static struct htable_option *htable_option_new(void)
  45 {
  46         struct htable_option *opts = malloc(sizeof(*opts));
  47         htable_option_init(opts);
  48         return opts;
  49 }
  50
  51 static void htable_option_free(struct htable_option *opts)
  52 {
  53         htable_option_clear(opts);
  54         free(opts);
  55 }
  56
  57 static unsigned int add_options(struct htable_option *opts,
  58                                 struct pp_conditions *cond)
  59 {
  60         unsigned int num = 0;
  61         if (cond->parent)
  62                 num += add_options(opts, cond->parent);
  63         if (cond->type == PP_COND_IF || cond->type == PP_COND_IFDEF) {
  64                 if (strstarts(cond->symbol, "HAVE_")) {
  65                         if (!htable_option_get(opts, cond->symbol)) {
  66                                 htable_option_add(opts, cond->symbol);
  67                                 num++;
  68                         }
  69                 }
  70         }
  71         return num;
  72 }
  73
  74 static struct htable_option *get_used_options(struct manifest *m)
  75 {
  76         struct list_head *list;
  77         struct ccan_file *f;
  78         unsigned int i, num;
  79         struct htable_option *opts = htable_option_new();
  80         struct line_info *info;
  81
  82         num = 0;
  83         foreach_ptr(list, &m->c_files, &m->h_files) {
  84                 list_for_each(list, f, list) {
  85                         info = get_ccan_line_info(f);
  86                         struct pp_conditions *prev = NULL;
  87
  88                         for (i = 0; i < f->num_lines; i++) {
  89                                 if (info[i].cond && info[i].cond != prev) {
  90                                         num += add_options(opts, info[i].cond);
  91                                         prev = info[i].cond;
  92                                 }
  93                         }
  94                 }
  95         }
  96
  97         if (!num) {
  98                 htable_option_free(opts);
  99                 opts = NULL;
 100         }
 101         return opts;
 102 }
 103
 104 static struct htable_option *get_config_options(struct manifest *m)
 105 {
 106         const char **lines = (const char **)strsplit(m, config_header, "\n");
 107         unsigned int i;
 108         struct htable_option *opts = htable_option_new();
 109
 110         for (i = 0; i < talloc_array_length(lines) - 1; i++) {
 111                 char *sym;
 112
 113                 if (!get_token(&lines[i], "#"))
 114                         continue;
 115                 if (!get_token(&lines[i], "define"))
 116                         continue;
 117                 sym = get_symbol_token(lines, &lines[i]);
 118                 if (!strstarts(sym, "HAVE_"))
 119                         continue;
 120                 /* Don't override endian... */
 121                 if (strends(sym, "_ENDIAN"))
 122                         continue;
 123                 /* Don't override HAVE_STRUCT_TIMESPEC. */
 124                 if (streq(sym, "HAVE_STRUCT_TIMESPEC"))
 125                         continue;
 126                 if (!get_token(&lines[i], "1"))
 127                         continue;
 128                 htable_option_add(opts, sym);
 129         }
 130         return opts;
 131 }
 132
 133 static void do_reduce_features(struct manifest *m,
 134                                unsigned int *timeleft, struct score *score)
 135 {
 136         struct htable_option *options_used, *options_avail, *options;
 137         struct htable_option_iter i;
 138         int fd;
 139         const char *sym;
 140         char *hdr;
 141
 142         /* This isn't really a test, as such. */
 143         score->total = 0;
 144         score->pass = true;
 145
 146         options_used = get_used_options(m);
 147         if (!options_used) {
 148                 return;
 149         }
 150         options_avail = get_config_options(m);
 151
 152         options = NULL;
 153         for (sym = htable_option_first(options_used, &i);
 154              sym;
 155              sym = htable_option_next(options_used, &i)) {
 156                 if (htable_option_get(options_avail, sym)) {
 157                         if (!options)
 158                                 options = htable_option_new();
 159                         htable_option_add(options, sym);
 160                 }
 161         }
 162         htable_option_free(options_avail);
 163         htable_option_free(options_used);
 164
 165         if (!options)
 166                 return;
 167
 168         /* Now make our own config.h variant, with our own options. */
 169         hdr = talloc_strdup(m, "/* Modified by reduce_features */\n");
 170         hdr = talloc_append_string(hdr, config_header);
 171         for (sym = htable_option_first(options, &i);
 172              sym;
 173              sym = htable_option_next(options, &i)) {
 174                 hdr = talloc_asprintf_append
 175                         (hdr, "#undef %s\n#define %s 0\n", sym, sym);
 176         }
 177         if (mkdir("reduced-features", 0700) != 0 && errno != EEXIST)
 178                 err(1, "Creating reduced-features directory");
 179
 180         fd = open("reduced-features/config.h", O_TRUNC|O_CREAT|O_RDWR, 0600);
 181         if (fd < 0)
 182                 err(1, "Creating reduced-features/config.h");
 183         if (!write_all(fd, hdr, strlen(hdr)))
 184                 err(1, "Writing reduced-features/config.h");
 185         close(fd);
 186         features_were_reduced = true;
 187 }
 188
 189 struct ccanlint reduce_features = {
 190         .key = "reduce_features",
 191         .name = "Produce config.h with reduced features",
 192         .can_run = can_run,
 193         .check = do_reduce_features,
 194         /* We only want to compile up versions with reduced featuress once
 195          * objects for normal tests are built. */
 196         .needs = "tests_compile"
 197 };
 198 REGISTER_TEST(reduce_features);