11 /* Checks to see if thing is in the hash. Returns true or false, and
12 notes thing in the hash.
14 This code does one Evil Thing. Since we're tracking pointers, we
15 tell perl that the string key is the address in the pointer. We do this by
16 passing in the address of the address, along with the size of a
17 pointer as the length. Perl then uses the four (or eight, on
18 64-bit machines) bytes of the address as the string we're using as
20 IV check_new(HV *tracking_hash, void *thing) {
21 if (hv_exists(tracking_hash, (char *)&thing, sizeof(void *))) {
24 hv_store(tracking_hash, (char *)&thing, sizeof(void *), &PL_sv_undef, 0);
29 /* Figure out how much magic is attached to the SV and return the
31 IV magic_size(SV *thing, HV *tracking_hash) {
36 if (!SvMAGIC(thing)) {
41 /* Get the base magic pointer */
42 magic_pointer = SvMAGIC(thing);
44 /* Have we seen the magic pointer? */
45 while (magic_pointer && check_new(tracking_hash, magic_pointer)) {
46 total_size += sizeof(MAGIC);
48 /* Have we seen the magic vtable? */
49 if (magic_pointer->mg_virtual &&
50 check_new(tracking_hash, magic_pointer->mg_virtual)) {
51 total_size += sizeof(MGVTBL);
54 /* Get the next in the chain */
55 magic_pointer = magic_pointer->mg_moremagic;
62 UV thing_size(SV *orig_thing, HV *tracking_hash) {
63 SV *thing = orig_thing;
64 UV total_size = sizeof(SV);
66 switch (SvTYPE(thing)) {
70 /* Just a plain integer. This will be differently sized depending
71 on whether purify's been compiled in */
74 total_size += sizeof(sizeof(XPVIV));
76 total_size += sizeof(IV);
79 /* Is it a float? Like the int, it depends on purify */
82 total_size += sizeof(sizeof(XPVNV));
84 total_size += sizeof(NV);
87 /* Is it a reference? */
89 total_size += sizeof(XRV);
91 /* How about a plain string? In which case we need to add in how
92 much has been allocated */
94 total_size += sizeof(XPV);
95 total_size += SvLEN(thing);
97 /* A string with an integer part? */
99 total_size += sizeof(XPVIV);
100 total_size += SvLEN(thing);
102 /* A string with a float part? */
104 total_size += sizeof(XPVNV);
105 total_size += SvLEN(thing);
108 total_size += sizeof(XPVMG);
109 total_size += SvLEN(thing);
110 total_size += magic_size(thing, tracking_hash);
113 total_size += sizeof(XPVBM);
114 total_size += SvLEN(thing);
115 total_size += magic_size(thing, tracking_hash);
118 total_size += sizeof(XPVLV);
119 total_size += SvLEN(thing);
120 total_size += magic_size(thing, tracking_hash);
122 /* How much space is dedicated to the array? Not counting the
123 elements in the array, mind, just the array itself */
125 total_size += sizeof(XPVAV);
126 /* Is there anything in the array? */
127 if (AvMAX(thing) != -1) {
128 total_size += sizeof(SV *) * AvMAX(thing);
130 /* Add in the bits on the other side of the beginning */
131 total_size += (sizeof(SV *) * (AvARRAY(thing) - AvALLOC(thing)));
132 /* Is there something hanging off the arylen element? */
133 if (AvARYLEN(thing)) {
134 if (check_new(tracking_hash, AvARYLEN(thing))) {
135 total_size += thing_size(AvARYLEN(thing), tracking_hash);
138 total_size += magic_size(thing, tracking_hash);
141 /* First the base struct */
142 total_size += sizeof(XPVHV);
143 /* Now the array of buckets */
144 total_size += (sizeof(HE *) * (HvMAX(thing) + 1));
145 /* Now walk the bucket chain */
146 if (HvARRAY(thing)) {
149 for (cur_bucket = 0; cur_bucket <= HvMAX(thing); cur_bucket++) {
150 cur_entry = *(HvARRAY(thing) + cur_bucket);
152 total_size += sizeof(HE);
153 if (cur_entry->hent_hek) {
154 /* Hash keys can be shared. Have we seen this before? */
155 if (check_new(tracking_hash, cur_entry->hent_hek)) {
156 total_size += sizeof(HEK);
157 total_size += cur_entry->hent_hek->hek_len - 1;
160 cur_entry = cur_entry->hent_next;
164 total_size += magic_size(thing, tracking_hash);
167 total_size += sizeof(XPVCV);
168 total_size += magic_size(thing, tracking_hash);
169 carp("CV isn't complete");
172 total_size += magic_size(thing, tracking_hash);
173 total_size += sizeof(XPVGV);
174 total_size += GvNAMELEN(thing);
175 /* Is there a file? */
177 if (check_new(tracking_hash, GvFILE(thing))) {
178 total_size += strlen(GvFILE(thing));
181 /* Is there something hanging off the glob? */
183 if (check_new(tracking_hash, GvGP(thing))) {
184 total_size += sizeof(GP);
189 total_size += sizeof(XPVFM);
190 carp("FM isn't complete");
193 total_size += sizeof(XPVIO);
194 carp("IO isn't complete");
197 croak("Unknown variable type");
202 MODULE = Devel::Size PACKAGE = Devel::Size
211 SV *thing = orig_thing;
212 /* Hash to track our seen pointers */
213 HV *tracking_hash = newHV();
215 /* If they passed us a reference then dereference it. This is the
216 only way we can check the sizes of arrays and hashes */
217 if (SvOK(thing) && SvROK(thing)) {
221 RETVAL = thing_size(thing, tracking_hash);
222 /* Clean up after ourselves */
223 SvREFCNT_dec(tracking_hash);
230 total_size(orig_thing)
234 SV *thing = orig_thing;
235 /* Hash to track our seen pointers */
236 HV *tracking_hash = newHV();
237 AV *pending_array = newAV();
239 /* Size starts at zero */
242 /* If they passed us a reference then dereference it. This is the
243 only way we can check the sizes of arrays and hashes */
244 if (SvOK(thing) && SvROK(thing)) {
248 /* Put it on the pending array */
249 av_push(pending_array, thing);
251 /* Now just yank things off the end of the array until it's done */
252 while (av_len(pending_array) >= 0) {
253 thing = av_pop(pending_array);
254 /* Process it if we've not seen it */
255 if (check_new(tracking_hash, thing)) {
258 /* Yes, it is. So let's check the type */
259 switch (SvTYPE(thing)) {
261 av_push(pending_array, SvRV(thing));
266 /* Quick alias to cut down on casting */
267 AV *tempAV = (AV *)thing;
271 if (av_len(tempAV) != -1) {
273 /* Run through them all */
274 for (index = 0; index <= av_len(tempAV); index++) {
275 /* Did we get something? */
276 if (tempSV = av_fetch(tempAV, index, 0)) {
278 if (*tempSV != &PL_sv_undef) {
279 /* Apparently not. Save it for later */
280 av_push(pending_array, *tempSV);
289 /* Is there anything in here? */
290 if (hv_iterinit((HV *)thing)) {
292 while (temp_he = hv_iternext((HV *)thing)) {
293 av_push(pending_array, hv_iterval((HV *)thing, temp_he));
299 /* Run through all the pieces and push the ones with bits */
301 av_push(pending_array, (SV *)GvSV(thing));
304 av_push(pending_array, (SV *)GvFORM(thing));
307 av_push(pending_array, (SV *)GvAV(thing));
310 av_push(pending_array, (SV *)GvHV(thing));
313 av_push(pending_array, (SV *)GvCV(thing));
321 RETVAL += thing_size(thing, tracking_hash);
325 /* Clean up after ourselves */
326 SvREFCNT_dec(tracking_hash);
327 SvREFCNT_dec(pending_array);