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 carp("CV isn't complete");
171 total_size += sizeof(XPVGV);
172 carp("GC isn't complete");
175 total_size += sizeof(XPVFM);
176 carp("FM isn't complete");
179 total_size += sizeof(XPVIO);
180 carp("IO isn't complete");
183 croak("Unknown variable type");
189 MODULE = Devel::Size PACKAGE = Devel::Size
196 SV *thing = orig_thing;
197 /* Hash to track our seen pointers */
198 HV *tracking_hash = newHV();
200 /* If they passed us a reference then dereference it. This is the
201 only way we can check the sizes of arrays and hashes */
202 if (SvOK(thing) && SvROK(thing)) {
206 RETVAL = thing_size(thing, tracking_hash);
207 /* Clean up after ourselves */
208 SvREFCNT_dec(tracking_hash);
215 total_size(orig_thing)
219 SV *thing = orig_thing;
220 /* Hash to track our seen pointers */
221 HV *tracking_hash = newHV();
222 AV *pending_array = newAV();
224 /* Size starts at zero */
227 /* If they passed us a reference then dereference it. This is the
228 only way we can check the sizes of arrays and hashes */
229 if (SvOK(thing) && SvROK(thing)) {
233 /* Put it on the pending array */
234 av_push(pending_array, thing);
236 /* Now just yank things off the end of the array until it's done */
237 while (&PL_sv_undef != (thing = av_pop(pending_array))) {
238 /* Process it if we've not seen it */
239 if (check_new(tracking_hash, thing)) {
240 /* First, is it pointing to or contraining something else? */
242 /* Yes, it is. So let's check the type */
244 switch (SvTYPE(thing)) {
246 av_push(pending_array, SvRV(thing));
251 /* Quick alias to cut down on casting */
252 AV *tempAV = (AV *)thing;
256 if (av_len(tempAV) != -1) {
258 /* Run through them all */
259 for (index = 0; index <= av_len(tempAV); index++) {
260 /* Did we get something? */
261 if (tempSV = av_fetch(tempAV, index, 0)) {
263 if (*tempSV != &PL_sv_undef) {
264 /* Apparently not. Save it for later */
265 av_push(pending_array, *tempSV);
281 RETVAL += thing_size(thing, tracking_hash);
285 /* Clean up after ourselves */
286 SvREFCNT_dec(tracking_hash);
287 SvREFCNT_dec(pending_array);