njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 1 | |
| 2 | /*--------------------------------------------------------------------*/ |
njn | 1d0825f | 2006-03-27 11:37:07 +0000 | [diff] [blame] | 3 | /*--- The leak checker. mc_leakcheck.c ---*/ |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 4 | /*--------------------------------------------------------------------*/ |
| 5 | |
| 6 | /* |
nethercote | 137bc55 | 2003-11-14 17:47:54 +0000 | [diff] [blame] | 7 | This file is part of MemCheck, a heavyweight Valgrind tool for |
njn | 1d0825f | 2006-03-27 11:37:07 +0000 | [diff] [blame] | 8 | detecting memory errors. |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 9 | |
sewardj | 03f8d3f | 2012-08-05 15:46:46 +0000 | [diff] [blame] | 10 | Copyright (C) 2000-2012 Julian Seward |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 11 | jseward@acm.org |
| 12 | |
| 13 | This program is free software; you can redistribute it and/or |
| 14 | modify it under the terms of the GNU General Public License as |
| 15 | published by the Free Software Foundation; either version 2 of the |
| 16 | License, or (at your option) any later version. |
| 17 | |
| 18 | This program is distributed in the hope that it will be useful, but |
| 19 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 21 | General Public License for more details. |
| 22 | |
| 23 | You should have received a copy of the GNU General Public License |
| 24 | along with this program; if not, write to the Free Software |
| 25 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 26 | 02111-1307, USA. |
| 27 | |
| 28 | The GNU General Public License is contained in the file COPYING. |
| 29 | */ |
| 30 | |
njn | c7561b9 | 2005-06-19 01:24:32 +0000 | [diff] [blame] | 31 | #include "pub_tool_basics.h" |
sewardj | 4cfea4f | 2006-10-14 19:26:10 +0000 | [diff] [blame] | 32 | #include "pub_tool_vki.h" |
njn | ac1e033 | 2009-05-08 00:39:31 +0000 | [diff] [blame] | 33 | #include "pub_tool_aspacehl.h" |
njn | 4802b38 | 2005-06-11 04:58:29 +0000 | [diff] [blame] | 34 | #include "pub_tool_aspacemgr.h" |
njn | 1d0825f | 2006-03-27 11:37:07 +0000 | [diff] [blame] | 35 | #include "pub_tool_execontext.h" |
| 36 | #include "pub_tool_hashtable.h" |
njn | 97405b2 | 2005-06-02 03:39:33 +0000 | [diff] [blame] | 37 | #include "pub_tool_libcbase.h" |
njn | 132bfcc | 2005-06-04 19:16:06 +0000 | [diff] [blame] | 38 | #include "pub_tool_libcassert.h" |
njn | 36a20fa | 2005-06-03 03:08:39 +0000 | [diff] [blame] | 39 | #include "pub_tool_libcprint.h" |
njn | de62cbf | 2005-06-10 22:08:14 +0000 | [diff] [blame] | 40 | #include "pub_tool_libcsignal.h" |
njn | 6ace3ea | 2005-06-17 03:06:27 +0000 | [diff] [blame] | 41 | #include "pub_tool_machine.h" |
njn | c7561b9 | 2005-06-19 01:24:32 +0000 | [diff] [blame] | 42 | #include "pub_tool_mallocfree.h" |
| 43 | #include "pub_tool_options.h" |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 44 | #include "pub_tool_oset.h" |
philippe | 6643e96 | 2012-01-17 21:16:30 +0000 | [diff] [blame] | 45 | #include "pub_tool_poolalloc.h" |
| 46 | #include "pub_tool_signals.h" // Needed for mc_include.h |
sewardj | 6c591e1 | 2011-04-11 16:17:51 +0000 | [diff] [blame] | 47 | #include "pub_tool_libcsetjmp.h" // setjmp facilities |
njn | 1d0825f | 2006-03-27 11:37:07 +0000 | [diff] [blame] | 48 | #include "pub_tool_tooliface.h" // Needed for mc_include.h |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 49 | |
njn | 1d0825f | 2006-03-27 11:37:07 +0000 | [diff] [blame] | 50 | #include "mc_include.h" |
njn | c7561b9 | 2005-06-19 01:24:32 +0000 | [diff] [blame] | 51 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 52 | /*------------------------------------------------------------*/ |
| 53 | /*--- An overview of leak checking. ---*/ |
| 54 | /*------------------------------------------------------------*/ |
njn | c7561b9 | 2005-06-19 01:24:32 +0000 | [diff] [blame] | 55 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 56 | // Leak-checking is a directed-graph traversal problem. The graph has |
| 57 | // two kinds of nodes: |
| 58 | // - root-set nodes: |
| 59 | // - GP registers of all threads; |
| 60 | // - valid, aligned, pointer-sized data words in valid client memory, |
| 61 | // including stacks, but excluding words within client heap-allocated |
| 62 | // blocks (they are excluded so that later on we can differentiate |
| 63 | // between heap blocks that are indirectly leaked vs. directly leaked). |
| 64 | // - heap-allocated blocks. A block is a mempool chunk or a malloc chunk |
| 65 | // that doesn't contain a mempool chunk. Nb: the terms "blocks" and |
| 66 | // "chunks" are used interchangeably below. |
| 67 | // |
| 68 | // There are two kinds of edges: |
| 69 | // - start-pointers, i.e. pointers to the start of a block; |
| 70 | // - interior-pointers, i.e. pointers to the interior of a block. |
| 71 | // |
| 72 | // We use "pointers" rather than "edges" below. |
| 73 | // |
| 74 | // Root set nodes only point to blocks. Blocks only point to blocks; |
| 75 | // a block can point to itself. |
| 76 | // |
| 77 | // The aim is to traverse the graph and determine the status of each block. |
| 78 | // |
| 79 | // There are 9 distinct cases. See memcheck/docs/mc-manual.xml for details. |
| 80 | // Presenting all nine categories to the user is probably too much. |
| 81 | // Currently we do this: |
| 82 | // - definitely lost: case 3 |
| 83 | // - indirectly lost: case 4, 9 |
| 84 | // - possibly lost: cases 5..8 |
| 85 | // - still reachable: cases 1, 2 |
| 86 | // |
| 87 | // It's far from clear that this is the best possible categorisation; it's |
| 88 | // accreted over time without any central guiding principle. |
| 89 | |
| 90 | /*------------------------------------------------------------*/ |
| 91 | /*--- XXX: Thoughts for improvement. ---*/ |
| 92 | /*------------------------------------------------------------*/ |
| 93 | |
| 94 | // From the user's point of view: |
| 95 | // - If they aren't using interior-pointers, they just have to fix the |
| 96 | // directly lost blocks, and the indirectly lost ones will be fixed as |
| 97 | // part of that. Any possibly lost blocks will just be due to random |
| 98 | // pointer garbage and can be ignored. |
| 99 | // |
| 100 | // - If they are using interior-pointers, the fact that they currently are not |
| 101 | // being told which ones might be directly lost vs. indirectly lost makes |
| 102 | // it hard to know where to begin. |
| 103 | // |
| 104 | // All this makes me wonder if new option is warranted: |
| 105 | // --follow-interior-pointers. By default it would be off, the leak checker |
| 106 | // wouldn't follow interior-pointers and there would only be 3 categories: |
| 107 | // R, DL, IL. |
| 108 | // |
| 109 | // If turned on, then it would show 7 categories (R, DL, IL, DR/DL, IR/IL, |
| 110 | // IR/IL/DL, IL/DL). That output is harder to understand but it's your own |
| 111 | // damn fault for using interior-pointers... |
| 112 | // |
| 113 | // ---- |
| 114 | // |
| 115 | // Also, why are two blank lines printed between each loss record? |
njn | c2f8b1b | 2009-08-10 06:47:00 +0000 | [diff] [blame] | 116 | // [bug 197930] |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 117 | // |
| 118 | // ---- |
| 119 | // |
| 120 | // Also, --show-reachable is a bad name because it also turns on the showing |
| 121 | // of indirectly leaked blocks(!) It would be better named --show-all or |
| 122 | // --show-all-heap-blocks, because that's the end result. |
philippe | 2193a7c | 2012-12-08 17:54:16 +0000 | [diff] [blame] | 123 | // We now have the option --show-leak-kinds=... which allows to specify =all. |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 124 | // |
| 125 | // ---- |
| 126 | // |
| 127 | // Also, the VALGRIND_LEAK_CHECK and VALGRIND_QUICK_LEAK_CHECK aren't great |
| 128 | // names. VALGRIND_FULL_LEAK_CHECK and VALGRIND_SUMMARY_LEAK_CHECK would be |
| 129 | // better. |
| 130 | // |
| 131 | // ---- |
| 132 | // |
| 133 | // Also, VALGRIND_COUNT_LEAKS and VALGRIND_COUNT_LEAK_BLOCKS aren't great as |
| 134 | // they combine direct leaks and indirect leaks into one. New, more precise |
| 135 | // ones (they'll need new names) would be good. If more categories are |
| 136 | // used, as per the --follow-interior-pointers option, they should be |
| 137 | // updated accordingly. And they should use a struct to return the values. |
| 138 | // |
| 139 | // ---- |
| 140 | // |
| 141 | // Also, for this case: |
| 142 | // |
| 143 | // (4) p4 BBB ---> AAA |
| 144 | // |
| 145 | // BBB is definitely directly lost. AAA is definitely indirectly lost. |
| 146 | // Here's the relevant loss records printed for a full check (each block is |
| 147 | // 16 bytes): |
| 148 | // |
| 149 | // ==20397== 16 bytes in 1 blocks are indirectly lost in loss record 9 of 15 |
| 150 | // ==20397== at 0x4C2694E: malloc (vg_replace_malloc.c:177) |
| 151 | // ==20397== by 0x400521: mk (leak-cases.c:49) |
| 152 | // ==20397== by 0x400578: main (leak-cases.c:72) |
| 153 | // |
| 154 | // ==20397== 32 (16 direct, 16 indirect) bytes in 1 blocks are definitely |
| 155 | // lost in loss record 14 of 15 |
| 156 | // ==20397== at 0x4C2694E: malloc (vg_replace_malloc.c:177) |
| 157 | // ==20397== by 0x400521: mk (leak-cases.c:49) |
| 158 | // ==20397== by 0x400580: main (leak-cases.c:72) |
| 159 | // |
| 160 | // The first one is fine -- it describes AAA. |
| 161 | // |
| 162 | // The second one is for BBB. It's correct in that 16 bytes in 1 block are |
| 163 | // directly lost. It's also correct that 16 are indirectly lost as a result, |
| 164 | // but it means that AAA is being counted twice in the loss records. (It's |
| 165 | // not, thankfully, counted twice in the summary counts). Argh. |
| 166 | // |
| 167 | // This would be less confusing for the second one: |
| 168 | // |
| 169 | // ==20397== 16 bytes in 1 blocks are definitely lost in loss record 14 |
| 170 | // of 15 (and 16 bytes in 1 block are indirectly lost as a result; they |
philippe | 2193a7c | 2012-12-08 17:54:16 +0000 | [diff] [blame] | 171 | // are mentioned elsewhere (if --show-reachable=yes or indirect is given |
| 172 | // in --show-leak-kinds=... !)) |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 173 | // ==20397== at 0x4C2694E: malloc (vg_replace_malloc.c:177) |
| 174 | // ==20397== by 0x400521: mk (leak-cases.c:49) |
| 175 | // ==20397== by 0x400580: main (leak-cases.c:72) |
| 176 | // |
| 177 | // But ideally we'd present the loss record for the directly lost block and |
| 178 | // then the resultant indirectly lost blocks and make it clear the |
| 179 | // dependence. Double argh. |
| 180 | |
| 181 | /*------------------------------------------------------------*/ |
| 182 | /*--- The actual algorithm. ---*/ |
| 183 | /*------------------------------------------------------------*/ |
| 184 | |
| 185 | // - Find all the blocks (a.k.a. chunks) to check. Mempool chunks require |
| 186 | // some special treatment because they can be within malloc'd blocks. |
| 187 | // - Scan every word in the root set (GP registers and valid |
| 188 | // non-heap memory words). |
| 189 | // - First, we skip if it doesn't point to valid memory. |
| 190 | // - Then, we see if it points to the start or interior of a block. If |
| 191 | // so, we push the block onto the mark stack and mark it as having been |
| 192 | // reached. |
| 193 | // - Then, we process the mark stack, repeating the scanning for each block; |
| 194 | // this can push more blocks onto the mark stack. We repeat until the |
| 195 | // mark stack is empty. Each block is marked as definitely or possibly |
| 196 | // reachable, depending on whether interior-pointers were required to |
| 197 | // reach it. |
| 198 | // - At this point we know for every block if it's reachable or not. |
| 199 | // - We then push each unreached block onto the mark stack, using the block |
| 200 | // number as the "clique" number. |
| 201 | // - We process the mark stack again, this time grouping blocks into cliques |
| 202 | // in order to facilitate the directly/indirectly lost categorisation. |
| 203 | // - We group blocks by their ExeContexts and categorisation, and print them |
| 204 | // if --leak-check=full. We also print summary numbers. |
| 205 | // |
| 206 | // A note on "cliques": |
| 207 | // - A directly lost block is one with no pointers to it. An indirectly |
| 208 | // lost block is one that is pointed to by a directly or indirectly lost |
| 209 | // block. |
| 210 | // - Each directly lost block has zero or more indirectly lost blocks |
| 211 | // hanging off it. All these blocks together form a "clique". The |
| 212 | // directly lost block is called the "clique leader". The clique number |
| 213 | // is the number (in lc_chunks[]) of the clique leader. |
| 214 | // - Actually, a directly lost block may be pointed to if it's part of a |
| 215 | // cycle. In that case, there may be more than one choice for the clique |
| 216 | // leader, and the choice is arbitrary. Eg. if you have A-->B and B-->A |
| 217 | // either A or B could be the clique leader. |
| 218 | // - Cliques cannot overlap, and will be truncated to avoid this. Eg. if we |
| 219 | // have A-->C and B-->C, the two cliques will be {A,C} and {B}, or {A} and |
| 220 | // {B,C} (again the choice is arbitrary). This is because we don't want |
| 221 | // to count a block as indirectly lost more than once. |
| 222 | // |
| 223 | // A note on 'is_prior_definite': |
| 224 | // - This is a boolean used in various places that indicates if the chain |
| 225 | // up to the prior node (prior to the one being considered) is definite. |
| 226 | // - In the clique == -1 case: |
| 227 | // - if True it means that the prior node is a root-set node, or that the |
| 228 | // prior node is a block which is reachable from the root-set via |
| 229 | // start-pointers. |
| 230 | // - if False it means that the prior node is a block that is only |
| 231 | // reachable from the root-set via a path including at least one |
| 232 | // interior-pointer. |
| 233 | // - In the clique != -1 case, currently it's always True because we treat |
| 234 | // start-pointers and interior-pointers the same for direct/indirect leak |
| 235 | // checking. If we added a PossibleIndirectLeak state then this would |
| 236 | // change. |
| 237 | |
| 238 | |
| 239 | // Define to debug the memory-leak-detector. |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 240 | #define VG_DEBUG_LEAKCHECK 0 |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 241 | #define VG_DEBUG_CLIQUE 0 |
| 242 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 243 | |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 244 | /*------------------------------------------------------------*/ |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 245 | /*--- Getting the initial chunks, and searching them. ---*/ |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 246 | /*------------------------------------------------------------*/ |
| 247 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 248 | // Compare the MC_Chunks by 'data' (i.e. the address of the block). |
florian | 6bd9dc1 | 2012-11-23 16:17:43 +0000 | [diff] [blame] | 249 | static Int compare_MC_Chunks(const void* n1, const void* n2) |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 250 | { |
florian | 3e79863 | 2012-11-24 19:41:54 +0000 | [diff] [blame] | 251 | const MC_Chunk* mc1 = *(const MC_Chunk *const *)n1; |
| 252 | const MC_Chunk* mc2 = *(const MC_Chunk *const *)n2; |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 253 | if (mc1->data < mc2->data) return -1; |
| 254 | if (mc1->data > mc2->data) return 1; |
| 255 | return 0; |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 256 | } |
| 257 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 258 | #if VG_DEBUG_LEAKCHECK |
| 259 | // Used to sanity-check the fast binary-search mechanism. |
| 260 | static |
| 261 | Int find_chunk_for_OLD ( Addr ptr, |
| 262 | MC_Chunk** chunks, |
| 263 | Int n_chunks ) |
| 264 | |
| 265 | { |
| 266 | Int i; |
| 267 | Addr a_lo, a_hi; |
| 268 | PROF_EVENT(70, "find_chunk_for_OLD"); |
| 269 | for (i = 0; i < n_chunks; i++) { |
| 270 | PROF_EVENT(71, "find_chunk_for_OLD(loop)"); |
| 271 | a_lo = chunks[i]->data; |
| 272 | a_hi = ((Addr)chunks[i]->data) + chunks[i]->szB; |
| 273 | if (a_lo <= ptr && ptr < a_hi) |
| 274 | return i; |
| 275 | } |
| 276 | return -1; |
| 277 | } |
| 278 | #endif |
| 279 | |
| 280 | // Find the i such that ptr points at or inside the block described by |
| 281 | // chunks[i]. Return -1 if none found. This assumes that chunks[] |
| 282 | // has been sorted on the 'data' field. |
| 283 | static |
| 284 | Int find_chunk_for ( Addr ptr, |
| 285 | MC_Chunk** chunks, |
| 286 | Int n_chunks ) |
| 287 | { |
| 288 | Addr a_mid_lo, a_mid_hi; |
| 289 | Int lo, mid, hi, retVal; |
| 290 | // VG_(printf)("find chunk for %p = ", ptr); |
| 291 | retVal = -1; |
| 292 | lo = 0; |
| 293 | hi = n_chunks-1; |
| 294 | while (True) { |
| 295 | // Invariant: current unsearched space is from lo to hi, inclusive. |
| 296 | if (lo > hi) break; // not found |
| 297 | |
| 298 | mid = (lo + hi) / 2; |
| 299 | a_mid_lo = chunks[mid]->data; |
| 300 | a_mid_hi = chunks[mid]->data + chunks[mid]->szB; |
| 301 | // Extent of block 'mid' is [a_mid_lo .. a_mid_hi). |
| 302 | // Special-case zero-sized blocks - treat them as if they had |
| 303 | // size 1. Not doing so causes them to not cover any address |
| 304 | // range at all and so will never be identified as the target of |
| 305 | // any pointer, which causes them to be incorrectly reported as |
| 306 | // definitely leaked. |
| 307 | if (chunks[mid]->szB == 0) |
| 308 | a_mid_hi++; |
| 309 | |
| 310 | if (ptr < a_mid_lo) { |
| 311 | hi = mid-1; |
| 312 | continue; |
| 313 | } |
| 314 | if (ptr >= a_mid_hi) { |
| 315 | lo = mid+1; |
| 316 | continue; |
| 317 | } |
| 318 | tl_assert(ptr >= a_mid_lo && ptr < a_mid_hi); |
| 319 | retVal = mid; |
| 320 | break; |
| 321 | } |
| 322 | |
| 323 | # if VG_DEBUG_LEAKCHECK |
| 324 | tl_assert(retVal == find_chunk_for_OLD ( ptr, chunks, n_chunks )); |
| 325 | # endif |
| 326 | // VG_(printf)("%d\n", retVal); |
| 327 | return retVal; |
| 328 | } |
| 329 | |
| 330 | |
| 331 | static MC_Chunk** |
florian | 54fe202 | 2012-10-27 23:07:42 +0000 | [diff] [blame] | 332 | find_active_chunks(Int* pn_chunks) |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 333 | { |
| 334 | // Our goal is to construct a set of chunks that includes every |
| 335 | // mempool chunk, and every malloc region that *doesn't* contain a |
| 336 | // mempool chunk. |
| 337 | MC_Mempool *mp; |
| 338 | MC_Chunk **mallocs, **chunks, *mc; |
| 339 | UInt n_mallocs, n_chunks, m, s; |
| 340 | Bool *malloc_chunk_holds_a_pool_chunk; |
| 341 | |
| 342 | // First we collect all the malloc chunks into an array and sort it. |
| 343 | // We do this because we want to query the chunks by interior |
| 344 | // pointers, requiring binary search. |
| 345 | mallocs = (MC_Chunk**) VG_(HT_to_array)( MC_(malloc_list), &n_mallocs ); |
| 346 | if (n_mallocs == 0) { |
| 347 | tl_assert(mallocs == NULL); |
| 348 | *pn_chunks = 0; |
| 349 | return NULL; |
| 350 | } |
| 351 | VG_(ssort)(mallocs, n_mallocs, sizeof(VgHashNode*), compare_MC_Chunks); |
| 352 | |
| 353 | // Then we build an array containing a Bool for each malloc chunk, |
| 354 | // indicating whether it contains any mempools. |
| 355 | malloc_chunk_holds_a_pool_chunk = VG_(calloc)( "mc.fas.1", |
| 356 | n_mallocs, sizeof(Bool) ); |
| 357 | n_chunks = n_mallocs; |
| 358 | |
| 359 | // Then we loop over the mempool tables. For each chunk in each |
| 360 | // pool, we set the entry in the Bool array corresponding to the |
| 361 | // malloc chunk containing the mempool chunk. |
| 362 | VG_(HT_ResetIter)(MC_(mempool_list)); |
| 363 | while ( (mp = VG_(HT_Next)(MC_(mempool_list))) ) { |
| 364 | VG_(HT_ResetIter)(mp->chunks); |
| 365 | while ( (mc = VG_(HT_Next)(mp->chunks)) ) { |
| 366 | |
| 367 | // We'll need to record this chunk. |
| 368 | n_chunks++; |
| 369 | |
| 370 | // Possibly invalidate the malloc holding the beginning of this chunk. |
| 371 | m = find_chunk_for(mc->data, mallocs, n_mallocs); |
| 372 | if (m != -1 && malloc_chunk_holds_a_pool_chunk[m] == False) { |
| 373 | tl_assert(n_chunks > 0); |
| 374 | n_chunks--; |
| 375 | malloc_chunk_holds_a_pool_chunk[m] = True; |
| 376 | } |
| 377 | |
| 378 | // Possibly invalidate the malloc holding the end of this chunk. |
| 379 | if (mc->szB > 1) { |
| 380 | m = find_chunk_for(mc->data + (mc->szB - 1), mallocs, n_mallocs); |
| 381 | if (m != -1 && malloc_chunk_holds_a_pool_chunk[m] == False) { |
| 382 | tl_assert(n_chunks > 0); |
| 383 | n_chunks--; |
| 384 | malloc_chunk_holds_a_pool_chunk[m] = True; |
| 385 | } |
| 386 | } |
| 387 | } |
| 388 | } |
| 389 | tl_assert(n_chunks > 0); |
| 390 | |
| 391 | // Create final chunk array. |
| 392 | chunks = VG_(malloc)("mc.fas.2", sizeof(VgHashNode*) * (n_chunks)); |
| 393 | s = 0; |
| 394 | |
| 395 | // Copy the mempool chunks and the non-marked malloc chunks into a |
| 396 | // combined array of chunks. |
| 397 | VG_(HT_ResetIter)(MC_(mempool_list)); |
| 398 | while ( (mp = VG_(HT_Next)(MC_(mempool_list))) ) { |
| 399 | VG_(HT_ResetIter)(mp->chunks); |
| 400 | while ( (mc = VG_(HT_Next)(mp->chunks)) ) { |
| 401 | tl_assert(s < n_chunks); |
| 402 | chunks[s++] = mc; |
| 403 | } |
| 404 | } |
| 405 | for (m = 0; m < n_mallocs; ++m) { |
| 406 | if (!malloc_chunk_holds_a_pool_chunk[m]) { |
| 407 | tl_assert(s < n_chunks); |
| 408 | chunks[s++] = mallocs[m]; |
| 409 | } |
| 410 | } |
| 411 | tl_assert(s == n_chunks); |
| 412 | |
| 413 | // Free temporaries. |
| 414 | VG_(free)(mallocs); |
| 415 | VG_(free)(malloc_chunk_holds_a_pool_chunk); |
| 416 | |
| 417 | *pn_chunks = n_chunks; |
| 418 | |
| 419 | return chunks; |
| 420 | } |
| 421 | |
| 422 | /*------------------------------------------------------------*/ |
| 423 | /*--- The leak detector proper. ---*/ |
| 424 | /*------------------------------------------------------------*/ |
| 425 | |
| 426 | // Holds extra info about each block during leak checking. |
| 427 | typedef |
| 428 | struct { |
| 429 | UInt state:2; // Reachedness. |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 430 | UInt pending:1; // Scan pending. |
| 431 | UInt heuristic: (sizeof(UInt)*8)-3; |
| 432 | // Heuristic with which this block was considered reachable. |
| 433 | // LchNone if state != Reachable or no heuristic needed to |
| 434 | // consider it reachable. |
| 435 | |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 436 | union { |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 437 | SizeT indirect_szB; |
| 438 | // If Unreached, how many bytes are unreachable from here. |
| 439 | SizeT clique; |
| 440 | // if IndirectLeak, clique leader to which it belongs. |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 441 | } IorC; |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 442 | } |
| 443 | LC_Extra; |
| 444 | |
| 445 | // An array holding pointers to every chunk we're checking. Sorted by address. |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 446 | // lc_chunks is initialised during leak search. It is kept after leak search |
| 447 | // to support printing the list of blocks belonging to a loss record. |
| 448 | // lc_chunk array can only be used validly till the next "free" operation |
| 449 | // (as a free operation potentially destroys one or more chunks). |
| 450 | // To detect lc_chunk is valid, we store the nr of frees operations done |
| 451 | // when lc_chunk was build : lc_chunks (and lc_extras) stays valid as |
| 452 | // long as no free operations has been done since lc_chunks building. |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 453 | static MC_Chunk** lc_chunks; |
| 454 | // How many chunks we're dealing with. |
| 455 | static Int lc_n_chunks; |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 456 | static SizeT lc_chunks_n_frees_marker; |
| 457 | // This has the same number of entries as lc_chunks, and each entry |
| 458 | // in lc_chunks corresponds with the entry here (ie. lc_chunks[i] and |
| 459 | // lc_extras[i] describe the same block). |
| 460 | static LC_Extra* lc_extras; |
| 461 | |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 462 | // chunks will be converted and merged in loss record, maintained in lr_table |
| 463 | // lr_table elements are kept from one leak_search to another to implement |
| 464 | // the "print new/changed leaks" client request |
| 465 | static OSet* lr_table; |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 466 | // Array of sorted loss record (produced during last leak search). |
| 467 | static LossRecord** lr_array; |
| 468 | |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 469 | // Value of the heuristics parameter used in the current (or last) leak check. |
| 470 | static UInt detect_memory_leaks_last_heuristics; |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 471 | |
| 472 | // DeltaMode used the last time we called detect_memory_leaks. |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 473 | // The recorded leak errors are output using a logic based on this delta_mode. |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 474 | // The below avoids replicating the delta_mode in each LossRecord. |
| 475 | LeakCheckDeltaMode MC_(detect_memory_leaks_last_delta_mode); |
| 476 | |
philippe | 4e32d67 | 2013-10-17 22:10:41 +0000 | [diff] [blame^] | 477 | // Each leak search run increments the below generation counter. |
| 478 | // A used suppression during a leak search will contain this |
| 479 | // generation number. |
| 480 | UInt MC_(leak_search_gen); |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 481 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 482 | // Records chunks that are currently being processed. Each element in the |
| 483 | // stack is an index into lc_chunks and lc_extras. Its size is |
| 484 | // 'lc_n_chunks' because in the worst case that's how many chunks could be |
| 485 | // pushed onto it (actually I think the maximum is lc_n_chunks-1 but let's |
| 486 | // be conservative). |
| 487 | static Int* lc_markstack; |
| 488 | // The index of the top element of the stack; -1 if the stack is empty, 0 if |
| 489 | // the stack has one element, 1 if it has two, etc. |
| 490 | static Int lc_markstack_top; |
| 491 | |
| 492 | // Keeps track of how many bytes of memory we've scanned, for printing. |
| 493 | // (Nb: We don't keep track of how many register bytes we've scanned.) |
| 494 | static SizeT lc_scanned_szB; |
philippe | 7a76f4b | 2013-10-06 21:23:04 +0000 | [diff] [blame] | 495 | // Keeps track of how many bytes we have not scanned due to read errors that |
| 496 | // caused a signal such as SIGSEGV. |
| 497 | static SizeT lc_sig_skipped_szB; |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 498 | |
| 499 | |
| 500 | SizeT MC_(bytes_leaked) = 0; |
| 501 | SizeT MC_(bytes_indirect) = 0; |
| 502 | SizeT MC_(bytes_dubious) = 0; |
| 503 | SizeT MC_(bytes_reachable) = 0; |
| 504 | SizeT MC_(bytes_suppressed) = 0; |
| 505 | |
| 506 | SizeT MC_(blocks_leaked) = 0; |
| 507 | SizeT MC_(blocks_indirect) = 0; |
| 508 | SizeT MC_(blocks_dubious) = 0; |
| 509 | SizeT MC_(blocks_reachable) = 0; |
| 510 | SizeT MC_(blocks_suppressed) = 0; |
| 511 | |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 512 | // Subset of MC_(bytes_reachable) and MC_(blocks_reachable) which |
| 513 | // are considered reachable due to the corresponding heuristic. |
| 514 | static SizeT MC_(bytes_heuristically_reachable)[N_LEAK_CHECK_HEURISTICS] |
| 515 | = {0,0,0,0}; |
| 516 | static SizeT MC_(blocks_heuristically_reachable)[N_LEAK_CHECK_HEURISTICS] |
| 517 | = {0,0,0,0}; |
| 518 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 519 | // Determines if a pointer is to a chunk. Returns the chunk number et al |
| 520 | // via call-by-reference. |
| 521 | static Bool |
| 522 | lc_is_a_chunk_ptr(Addr ptr, Int* pch_no, MC_Chunk** pch, LC_Extra** pex) |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 523 | { |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 524 | Int ch_no; |
| 525 | MC_Chunk* ch; |
| 526 | LC_Extra* ex; |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 527 | |
philippe | 57a16a2 | 2012-07-18 22:26:51 +0000 | [diff] [blame] | 528 | // Quick filter. Note: implemented with am, not with get_vabits2 |
| 529 | // as ptr might be random data pointing anywhere. On 64 bit |
| 530 | // platforms, getting va bits for random data can be quite costly |
| 531 | // due to the secondary map. |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 532 | if (!VG_(am_is_valid_for_client)(ptr, 1, VKI_PROT_READ)) { |
| 533 | return False; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 534 | } else { |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 535 | ch_no = find_chunk_for(ptr, lc_chunks, lc_n_chunks); |
| 536 | tl_assert(ch_no >= -1 && ch_no < lc_n_chunks); |
| 537 | |
| 538 | if (ch_no == -1) { |
| 539 | return False; |
| 540 | } else { |
| 541 | // Ok, we've found a pointer to a chunk. Get the MC_Chunk and its |
| 542 | // LC_Extra. |
| 543 | ch = lc_chunks[ch_no]; |
| 544 | ex = &(lc_extras[ch_no]); |
| 545 | |
| 546 | tl_assert(ptr >= ch->data); |
| 547 | tl_assert(ptr < ch->data + ch->szB + (ch->szB==0 ? 1 : 0)); |
| 548 | |
| 549 | if (VG_DEBUG_LEAKCHECK) |
| 550 | VG_(printf)("ptr=%#lx -> block %d\n", ptr, ch_no); |
| 551 | |
| 552 | *pch_no = ch_no; |
| 553 | *pch = ch; |
| 554 | *pex = ex; |
| 555 | |
| 556 | return True; |
| 557 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 558 | } |
| 559 | } |
| 560 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 561 | // Push a chunk (well, just its index) onto the mark stack. |
| 562 | static void lc_push(Int ch_no, MC_Chunk* ch) |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 563 | { |
tom | 1d0f3f6 | 2010-10-04 20:55:21 +0000 | [diff] [blame] | 564 | if (!lc_extras[ch_no].pending) { |
| 565 | if (0) { |
| 566 | VG_(printf)("pushing %#lx-%#lx\n", ch->data, ch->data + ch->szB); |
| 567 | } |
| 568 | lc_markstack_top++; |
| 569 | tl_assert(lc_markstack_top < lc_n_chunks); |
| 570 | lc_markstack[lc_markstack_top] = ch_no; |
| 571 | tl_assert(!lc_extras[ch_no].pending); |
| 572 | lc_extras[ch_no].pending = True; |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 573 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 574 | } |
| 575 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 576 | // Return the index of the chunk on the top of the mark stack, or -1 if |
| 577 | // there isn't one. |
| 578 | static Bool lc_pop(Int* ret) |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 579 | { |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 580 | if (-1 == lc_markstack_top) { |
| 581 | return False; |
| 582 | } else { |
| 583 | tl_assert(0 <= lc_markstack_top && lc_markstack_top < lc_n_chunks); |
| 584 | *ret = lc_markstack[lc_markstack_top]; |
| 585 | lc_markstack_top--; |
tom | 1d0f3f6 | 2010-10-04 20:55:21 +0000 | [diff] [blame] | 586 | tl_assert(lc_extras[*ret].pending); |
| 587 | lc_extras[*ret].pending = False; |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 588 | return True; |
| 589 | } |
| 590 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 591 | |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 592 | static const HChar* pp_heuristic(LeakCheckHeuristic h) |
| 593 | { |
| 594 | switch(h) { |
| 595 | case LchNone: return "none"; |
| 596 | case LchStdString: return "stdstring"; |
| 597 | case LchNewArray: return "newarray"; |
| 598 | case LchMultipleInheritance: return "multipleinheritance"; |
| 599 | default: return "???invalid heuristic???"; |
| 600 | } |
| 601 | } |
| 602 | |
| 603 | // True if ptr looks like the address of a vtable, i.e. if ptr |
| 604 | // points to an array of pointers to functions. |
| 605 | // It is assumed the only caller of this function is heuristic_reachedness |
| 606 | // which must check that ptr is aligned and above page 0. |
| 607 | // Checking that ptr is above page 0 is an optimisation : it is assumed |
| 608 | // that no vtable is located in the page 0. So, all small integer values |
| 609 | // encountered during the scan will not incur the cost of calling this |
| 610 | // function. |
| 611 | static Bool aligned_ptr_above_page0_is_vtable_addr(Addr ptr) |
| 612 | { |
| 613 | // ??? If performance problem: |
| 614 | // ??? maybe implement a cache (array indexed by ptr % primenr) |
| 615 | // ??? of "I am a vtable ptr" ??? |
| 616 | |
| 617 | // ??? Maybe the debug info could (efficiently?) be used to detect vtables ? |
| 618 | |
| 619 | // We consider ptr as a vtable ptr if it points to a table |
| 620 | // where we find only NULL pointers or pointers pointing at an |
| 621 | // executable region. We must find at least 2 non NULL pointers |
| 622 | // before considering ptr as a vtable pointer. |
| 623 | // We scan a maximum of VTABLE_MAX_CHECK words for these 2 non NULL |
| 624 | // pointers. |
| 625 | #define VTABLE_MAX_CHECK 20 |
| 626 | |
| 627 | NSegment const *seg; |
| 628 | UInt nr_fn_ptrs = 0; |
| 629 | Addr scan; |
| 630 | Addr scan_max; |
| 631 | |
| 632 | // First verify ptr points inside a client mapped file section. |
| 633 | // ??? is a vtable always in a file mapped readable section ? |
| 634 | seg = VG_(am_find_nsegment) (ptr); |
| 635 | if (seg == NULL |
| 636 | || seg->kind != SkFileC |
| 637 | || !seg->hasR) |
| 638 | return False; |
| 639 | |
| 640 | // Check potential function pointers, up to a maximum of VTABLE_MAX_CHECK. |
| 641 | scan_max = ptr + VTABLE_MAX_CHECK*sizeof(Addr); |
| 642 | // If ptr is near the end of seg, avoid scan_max exceeding the end of seg: |
| 643 | if (scan_max > seg->end - sizeof(Addr)) |
| 644 | scan_max = seg->end - sizeof(Addr); |
| 645 | for (scan = ptr; scan <= scan_max; scan+=sizeof(Addr)) { |
| 646 | Addr pot_fn = *((Addr *)scan); |
| 647 | if (pot_fn == 0) |
| 648 | continue; // NULL fn pointer. Seems it can happen in vtable. |
| 649 | seg = VG_(am_find_nsegment) (pot_fn); |
| 650 | #if defined(VGA_ppc64) |
| 651 | // ppc64 use a thunk table. So, we have one more level of indirection |
| 652 | // to follow. |
| 653 | if (seg == NULL |
| 654 | || seg->kind != SkFileC |
| 655 | || !seg->hasR |
| 656 | || !seg->hasW) |
| 657 | return False; // ptr to nowhere, or not a ptr to thunks. |
| 658 | pot_fn = *((Addr *)pot_fn); |
| 659 | if (pot_fn == 0) |
| 660 | continue; // NULL fn pointer. Seems it can happen in vtable. |
| 661 | seg = VG_(am_find_nsegment) (pot_fn); |
| 662 | #endif |
| 663 | if (seg == NULL |
| 664 | || seg->kind != SkFileC |
| 665 | || !seg->hasT) |
| 666 | return False; // ptr to nowhere, or not a fn ptr. |
| 667 | nr_fn_ptrs++; |
| 668 | if (nr_fn_ptrs == 2) |
| 669 | return True; |
| 670 | } |
| 671 | |
| 672 | return False; |
| 673 | } |
| 674 | |
| 675 | // If ch is heuristically reachable via an heuristic member of heur_set, |
| 676 | // returns this heuristic. |
| 677 | // If ch cannot be considered reachable using one of these heuristics, |
| 678 | // return LchNone. |
| 679 | // This should only be called when ptr is an interior ptr to ch. |
| 680 | // The StdString/NewArray/MultipleInheritance heuristics are directly |
| 681 | // inspired from DrMemory: |
| 682 | // see http://www.burningcutlery.com/derek/docs/drmem-CGO11.pdf [section VI,C] |
| 683 | // and bug 280271. |
| 684 | static LeakCheckHeuristic heuristic_reachedness (Addr ptr, |
| 685 | MC_Chunk *ch, LC_Extra *ex, |
| 686 | UInt heur_set) |
| 687 | { |
| 688 | if (HiS(LchStdString, heur_set)) { |
| 689 | // Detects inner pointers to Std::String for layout being |
| 690 | // length capacity refcount char_array[] \0 |
| 691 | // where ptr points to the beginning of the char_array. |
philippe | 078ab86 | 2013-10-13 18:38:30 +0000 | [diff] [blame] | 692 | // Note: we check definedness for length and capacity but |
| 693 | // not for refcount, as refcount size might be smaller than |
| 694 | // a SizeT, giving a uninitialised hole in the first 3 SizeT. |
| 695 | if ( ptr == ch->data + 3 * sizeof(SizeT) |
| 696 | && MC_(is_valid_aligned_word)(ch->data + sizeof(SizeT))) { |
| 697 | const SizeT capacity = *((SizeT*)(ch->data + sizeof(SizeT))); |
| 698 | if (3 * sizeof(SizeT) + capacity + 1 == ch->szB |
| 699 | && MC_(is_valid_aligned_word)(ch->data)) { |
| 700 | const SizeT length = *((SizeT*)ch->data); |
| 701 | if (length <= capacity) { |
| 702 | // ??? could check there is no null byte from ptr to ptr+length-1 |
| 703 | // ??? and that there is a null byte at ptr+length. |
| 704 | // ??? |
| 705 | // ??? could check that ch->allockind is MC_AllocNew ??? |
| 706 | // ??? probably not a good idea, as I guess stdstring |
| 707 | // ??? allocator can be done via custom allocator |
| 708 | // ??? or even a call to malloc ???? |
| 709 | return LchStdString; |
| 710 | } |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 711 | } |
| 712 | } |
| 713 | } |
| 714 | |
| 715 | if (HiS(LchNewArray, heur_set)) { |
| 716 | // Detects inner pointers at second word of new[] array, following |
| 717 | // a plausible nr of elements. |
| 718 | // Such inner pointers are used for arrays of elements |
| 719 | // having a destructor, as the delete[] of the array must know |
| 720 | // how many elements to destroy. |
| 721 | // |
| 722 | // We have a strange/wrong case for 'ptr = new MyClass[0];' : |
| 723 | // For such a case, the returned ptr points just outside the |
| 724 | // allocated chunk. This chunk is then seen as a definite |
| 725 | // leak by Valgrind, as it is not considered an interior pointer. |
| 726 | // It is the c++ equivalent of bug 99923 (malloc(0) wrongly considered |
| 727 | // as definitely leaked). See the trick in find_chunk_for handling |
| 728 | // 0-sized block. This trick does not work for 'new MyClass[0]' |
| 729 | // because a chunk "word-sized" is allocated to store the (0) nr |
| 730 | // of elements. |
philippe | 078ab86 | 2013-10-13 18:38:30 +0000 | [diff] [blame] | 731 | if ( ptr == ch->data + sizeof(SizeT) |
| 732 | && MC_(is_valid_aligned_word)(ch->data)) { |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 733 | const SizeT nr_elts = *((SizeT*)ch->data); |
| 734 | if (nr_elts > 0 && (ch->szB - sizeof(SizeT)) % nr_elts == 0) { |
| 735 | // ??? could check that ch->allockind is MC_AllocNewVec ??? |
| 736 | return LchNewArray; |
| 737 | } |
| 738 | } |
| 739 | } |
| 740 | |
| 741 | if (HiS(LchMultipleInheritance, heur_set)) { |
| 742 | // Detect inner pointer used for multiple inheritance. |
| 743 | // Assumption is that the vtable pointers are before the object. |
philippe | 078ab86 | 2013-10-13 18:38:30 +0000 | [diff] [blame] | 744 | if (VG_IS_WORD_ALIGNED(ptr) |
| 745 | && MC_(is_valid_aligned_word)(ptr)) { |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 746 | Addr first_addr; |
| 747 | Addr inner_addr; |
| 748 | |
| 749 | // Avoid the call to is_vtable_addr when the addr is not |
| 750 | // aligned or points in the page0, as it is unlikely |
| 751 | // a vtable is located in this page. This last optimisation |
| 752 | // avoids to call aligned_ptr_above_page0_is_vtable_addr |
| 753 | // for all small integers. |
| 754 | // Note: we could possibly also avoid calling this function |
| 755 | // for small negative integers, as no vtable should be located |
| 756 | // in the last page. |
| 757 | inner_addr = *((Addr*)ptr); |
| 758 | if (VG_IS_WORD_ALIGNED(inner_addr) |
philippe | 078ab86 | 2013-10-13 18:38:30 +0000 | [diff] [blame] | 759 | && inner_addr >= (Addr)VKI_PAGE_SIZE |
| 760 | && MC_(is_valid_aligned_word)(ch->data)) { |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 761 | first_addr = *((Addr*)ch->data); |
| 762 | if (VG_IS_WORD_ALIGNED(first_addr) |
| 763 | && first_addr >= (Addr)VKI_PAGE_SIZE |
| 764 | && aligned_ptr_above_page0_is_vtable_addr(inner_addr) |
| 765 | && aligned_ptr_above_page0_is_vtable_addr(first_addr)) { |
| 766 | // ??? could check that ch->allockind is MC_AllocNew ??? |
| 767 | return LchMultipleInheritance; |
| 768 | } |
| 769 | } |
| 770 | } |
| 771 | } |
| 772 | |
| 773 | return LchNone; |
| 774 | } |
| 775 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 776 | |
| 777 | // If 'ptr' is pointing to a heap-allocated block which hasn't been seen |
| 778 | // before, push it onto the mark stack. |
| 779 | static void |
| 780 | lc_push_without_clique_if_a_chunk_ptr(Addr ptr, Bool is_prior_definite) |
| 781 | { |
| 782 | Int ch_no; |
| 783 | MC_Chunk* ch; |
| 784 | LC_Extra* ex; |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 785 | Reachedness ch_via_ptr; // Is ch reachable via ptr, and how ? |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 786 | |
| 787 | if ( ! lc_is_a_chunk_ptr(ptr, &ch_no, &ch, &ex) ) |
| 788 | return; |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 789 | |
| 790 | if (ex->state == Reachable) { |
philippe | 078ab86 | 2013-10-13 18:38:30 +0000 | [diff] [blame] | 791 | if (ex->heuristic && ptr == ch->data) |
| 792 | // If block was considered reachable via an heuristic, and it is now |
| 793 | // directly reachable via ptr, clear the heuristic field. |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 794 | ex->heuristic = LchNone; |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 795 | return; |
| 796 | } |
tom | 1d0f3f6 | 2010-10-04 20:55:21 +0000 | [diff] [blame] | 797 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 798 | // Possibly upgrade the state, ie. one of: |
| 799 | // - Unreached --> Possible |
| 800 | // - Unreached --> Reachable |
| 801 | // - Possible --> Reachable |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 802 | |
| 803 | if (ptr == ch->data) |
| 804 | ch_via_ptr = Reachable; |
| 805 | else if (detect_memory_leaks_last_heuristics) { |
| 806 | ex->heuristic |
| 807 | = heuristic_reachedness (ptr, ch, ex, |
| 808 | detect_memory_leaks_last_heuristics); |
| 809 | if (ex->heuristic) |
| 810 | ch_via_ptr = Reachable; |
| 811 | else |
| 812 | ch_via_ptr = Possible; |
| 813 | } else |
| 814 | ch_via_ptr = Possible; |
| 815 | |
| 816 | if (ch_via_ptr == Reachable && is_prior_definite) { |
| 817 | // 'ptr' points to the start of the block or is to be considered as |
| 818 | // pointing to the start of the block, and the prior node is |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 819 | // definite, which means that this block is definitely reachable. |
| 820 | ex->state = Reachable; |
| 821 | |
tom | 1d0f3f6 | 2010-10-04 20:55:21 +0000 | [diff] [blame] | 822 | // State has changed to Reachable so (re)scan the block to make |
| 823 | // sure any blocks it points to are correctly marked. |
| 824 | lc_push(ch_no, ch); |
| 825 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 826 | } else if (ex->state == Unreached) { |
| 827 | // Either 'ptr' is a interior-pointer, or the prior node isn't definite, |
| 828 | // which means that we can only mark this block as possibly reachable. |
| 829 | ex->state = Possible; |
tom | 1d0f3f6 | 2010-10-04 20:55:21 +0000 | [diff] [blame] | 830 | |
| 831 | // State has changed to Possible so (re)scan the block to make |
| 832 | // sure any blocks it points to are correctly marked. |
| 833 | lc_push(ch_no, ch); |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 834 | } |
| 835 | } |
| 836 | |
| 837 | static void |
florian | 6bd9dc1 | 2012-11-23 16:17:43 +0000 | [diff] [blame] | 838 | lc_push_if_a_chunk_ptr_register(ThreadId tid, const HChar* regname, Addr ptr) |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 839 | { |
| 840 | lc_push_without_clique_if_a_chunk_ptr(ptr, /*is_prior_definite*/True); |
| 841 | } |
| 842 | |
| 843 | // If ptr is pointing to a heap-allocated block which hasn't been seen |
| 844 | // before, push it onto the mark stack. Clique is the index of the |
| 845 | // clique leader. |
| 846 | static void |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 847 | lc_push_with_clique_if_a_chunk_ptr(Addr ptr, Int clique, Int cur_clique) |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 848 | { |
| 849 | Int ch_no; |
| 850 | MC_Chunk* ch; |
| 851 | LC_Extra* ex; |
| 852 | |
| 853 | tl_assert(0 <= clique && clique < lc_n_chunks); |
| 854 | |
| 855 | if ( ! lc_is_a_chunk_ptr(ptr, &ch_no, &ch, &ex) ) |
| 856 | return; |
| 857 | |
| 858 | // If it's not Unreached, it's already been handled so ignore it. |
| 859 | // If ch_no==clique, it's the clique leader, which means this is a cyclic |
| 860 | // structure; again ignore it because it's already been handled. |
| 861 | if (ex->state == Unreached && ch_no != clique) { |
| 862 | // Note that, unlike reachable blocks, we currently don't distinguish |
| 863 | // between start-pointers and interior-pointers here. We probably |
| 864 | // should, though. |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 865 | lc_push(ch_no, ch); |
| 866 | |
| 867 | // Add the block to the clique, and add its size to the |
| 868 | // clique-leader's indirect size. Also, if the new block was |
| 869 | // itself a clique leader, it isn't any more, so add its |
| 870 | // indirect_szB to the new clique leader. |
| 871 | if (VG_DEBUG_CLIQUE) { |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 872 | if (ex->IorC.indirect_szB > 0) |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 873 | VG_(printf)(" clique %d joining clique %d adding %lu+%lu\n", |
bart | dc429d1 | 2011-07-29 14:24:07 +0000 | [diff] [blame] | 874 | ch_no, clique, (unsigned long)ch->szB, |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 875 | (unsigned long)ex->IorC.indirect_szB); |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 876 | else |
| 877 | VG_(printf)(" block %d joining clique %d adding %lu\n", |
bart | dc429d1 | 2011-07-29 14:24:07 +0000 | [diff] [blame] | 878 | ch_no, clique, (unsigned long)ch->szB); |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 879 | } |
| 880 | |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 881 | lc_extras[clique].IorC.indirect_szB += ch->szB; |
| 882 | lc_extras[clique].IorC.indirect_szB += ex->IorC.indirect_szB; |
| 883 | ex->state = IndirectLeak; |
| 884 | ex->IorC.clique = (SizeT) cur_clique; |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 885 | } |
| 886 | } |
| 887 | |
| 888 | static void |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 889 | lc_push_if_a_chunk_ptr(Addr ptr, |
| 890 | Int clique, Int cur_clique, Bool is_prior_definite) |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 891 | { |
| 892 | if (-1 == clique) |
| 893 | lc_push_without_clique_if_a_chunk_ptr(ptr, is_prior_definite); |
| 894 | else |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 895 | lc_push_with_clique_if_a_chunk_ptr(ptr, clique, cur_clique); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 896 | } |
| 897 | |
sewardj | 45d94cc | 2005-04-20 14:44:11 +0000 | [diff] [blame] | 898 | |
sewardj | 97d3ebb | 2011-04-11 18:36:34 +0000 | [diff] [blame] | 899 | static VG_MINIMAL_JMP_BUF(memscan_jmpbuf); |
philippe | 7a76f4b | 2013-10-06 21:23:04 +0000 | [diff] [blame] | 900 | static volatile Addr bad_scanned_addr; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 901 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 902 | static |
| 903 | void scan_all_valid_memory_catcher ( Int sigNo, Addr addr ) |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 904 | { |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 905 | if (0) |
| 906 | VG_(printf)("OUCH! sig=%d addr=%#lx\n", sigNo, addr); |
philippe | 7a76f4b | 2013-10-06 21:23:04 +0000 | [diff] [blame] | 907 | if (sigNo == VKI_SIGSEGV || sigNo == VKI_SIGBUS) { |
| 908 | bad_scanned_addr = addr; |
sewardj | 6c591e1 | 2011-04-11 16:17:51 +0000 | [diff] [blame] | 909 | VG_MINIMAL_LONGJMP(memscan_jmpbuf); |
philippe | 7a76f4b | 2013-10-06 21:23:04 +0000 | [diff] [blame] | 910 | } |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 911 | } |
| 912 | |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 913 | // lc_scan_memory has 2 modes: |
| 914 | // |
| 915 | // 1. Leak check mode (searched == 0). |
| 916 | // ----------------------------------- |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 917 | // Scan a block of memory between [start, start+len). This range may |
| 918 | // be bogus, inaccessable, or otherwise strange; we deal with it. For each |
| 919 | // valid aligned word we assume it's a pointer to a chunk a push the chunk |
| 920 | // onto the mark stack if so. |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 921 | // clique is the "highest level clique" in which indirectly leaked blocks have |
| 922 | // to be collected. cur_clique is the current "lower" level clique through which |
| 923 | // the memory to be scanned has been found. |
| 924 | // Example: in the below tree if A is leaked, the top level clique will |
| 925 | // be A, while lower level cliques will be B and C. |
| 926 | /* |
| 927 | A |
| 928 | / \ |
| 929 | B C |
| 930 | / \ / \ |
| 931 | D E F G |
| 932 | */ |
| 933 | // Proper handling of top and lowest level clique allows block_list of a loss |
| 934 | // record to describe the hierarchy of indirectly leaked blocks. |
| 935 | // |
| 936 | // 2. Search ptr mode (searched != 0). |
| 937 | // ----------------------------------- |
| 938 | // In this mode, searches for pointers to a specific address range |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 939 | // In such a case, lc_scan_memory just scans [start..start+len[ for pointers |
| 940 | // to searched and outputs the places where searched is found. |
| 941 | // It does not recursively scans the found memory. |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 942 | static void |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 943 | lc_scan_memory(Addr start, SizeT len, Bool is_prior_definite, |
| 944 | Int clique, Int cur_clique, |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 945 | Addr searched, SizeT szB) |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 946 | { |
philippe | 57a16a2 | 2012-07-18 22:26:51 +0000 | [diff] [blame] | 947 | /* memory scan is based on the assumption that valid pointers are aligned |
| 948 | on a multiple of sizeof(Addr). So, we can (and must) skip the begin and |
| 949 | end portions of the block if they are not aligned on sizeof(Addr): |
| 950 | These cannot be a valid pointer, and calls to MC_(is_valid_aligned_word) |
| 951 | will assert for a non aligned address. */ |
philippe | 110c77e | 2013-10-15 21:04:56 +0000 | [diff] [blame] | 952 | #if defined(VGA_s390x) |
| 953 | // Define ptr as volatile, as on this platform, the value of ptr |
| 954 | // is read in code executed via a longjmp. |
| 955 | volatile |
| 956 | #endif |
philippe | 7a76f4b | 2013-10-06 21:23:04 +0000 | [diff] [blame] | 957 | Addr ptr = VG_ROUNDUP(start, sizeof(Addr)); |
| 958 | const Addr end = VG_ROUNDDN(start+len, sizeof(Addr)); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 959 | vki_sigset_t sigmask; |
| 960 | |
| 961 | if (VG_DEBUG_LEAKCHECK) |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 962 | VG_(printf)("scan %#lx-%#lx (%lu)\n", start, end, len); |
| 963 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 964 | VG_(sigprocmask)(VKI_SIG_SETMASK, NULL, &sigmask); |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 965 | VG_(set_fault_catcher)(scan_all_valid_memory_catcher); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 966 | |
philippe | 57a16a2 | 2012-07-18 22:26:51 +0000 | [diff] [blame] | 967 | /* Optimisation: the loop below will check for each begin |
| 968 | of SM chunk if the chunk is fully unaddressable. The idea is to |
| 969 | skip efficiently such fully unaddressable SM chunks. |
| 970 | So, we preferrably start the loop on a chunk boundary. |
| 971 | If the chunk is not fully unaddressable, we might be in |
| 972 | an unaddressable page. Again, the idea is to skip efficiently |
| 973 | such unaddressable page : this is the "else" part. |
| 974 | We use an "else" so that two consecutive fully unaddressable |
| 975 | SM chunks will be skipped efficiently: first one is skipped |
| 976 | by this piece of code. The next SM chunk will be skipped inside |
| 977 | the loop. */ |
| 978 | if ( ! MC_(is_within_valid_secondary)(ptr) ) { |
| 979 | // Skip an invalid SM chunk till the beginning of the next SM Chunk. |
| 980 | ptr = VG_ROUNDUP(ptr+1, SM_SIZE); |
| 981 | } else if (!VG_(am_is_valid_for_client)(ptr, sizeof(Addr), VKI_PROT_READ)) { |
| 982 | // else we are in a (at least partially) valid SM chunk. |
| 983 | // We might be in the middle of an unreadable page. |
| 984 | // Do a cheap check to see if it's valid; |
| 985 | // if not, skip onto the next page. |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 986 | ptr = VG_PGROUNDUP(ptr+1); // First page is bad - skip it. |
philippe | 57a16a2 | 2012-07-18 22:26:51 +0000 | [diff] [blame] | 987 | } |
philippe | 7a76f4b | 2013-10-06 21:23:04 +0000 | [diff] [blame] | 988 | /* The above optimisation and below loop is based on some relationships |
| 989 | between VKI_PAGE_SIZE, SM_SIZE and sizeof(Addr) which are asserted in |
philippe | 57a16a2 | 2012-07-18 22:26:51 +0000 | [diff] [blame] | 990 | MC_(detect_memory_leaks). */ |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 991 | |
philippe | 7a76f4b | 2013-10-06 21:23:04 +0000 | [diff] [blame] | 992 | // During scan, we check with aspacemgr that each page is readable and |
| 993 | // belongs to client. |
| 994 | // We still protect against SIGSEGV and SIGBUS e.g. in case aspacemgr is |
| 995 | // desynchronised with the real page mappings. |
| 996 | // Such a desynchronisation could happen due to an aspacemgr bug. |
| 997 | // Note that if the application is using mprotect(NONE), then |
| 998 | // a page can be unreadable but have addressable and defined |
| 999 | // VA bits (see mc_main.c function mc_new_mem_mprotect). |
| 1000 | if (VG_MINIMAL_SETJMP(memscan_jmpbuf) != 0) { |
| 1001 | // Catch read error ... |
| 1002 | // We need to restore the signal mask, because we were |
| 1003 | // longjmped out of a signal handler. |
| 1004 | VG_(sigprocmask)(VKI_SIG_SETMASK, &sigmask, NULL); |
philippe | 110c77e | 2013-10-15 21:04:56 +0000 | [diff] [blame] | 1005 | # if defined(VGA_s390x) |
| 1006 | // For a SIGSEGV, s390 delivers the page address of the bad address. |
| 1007 | // For a SIGBUS, old s390 kernels deliver a NULL address. |
| 1008 | // bad_scanned_addr can thus not be used. |
| 1009 | // So, on this platform, we always skip a full page from ptr. |
| 1010 | // The below implies to mark ptr as volatile, as we read the value |
| 1011 | // after a longjmp to here. |
| 1012 | lc_sig_skipped_szB += VKI_PAGE_SIZE; |
| 1013 | ptr = ptr + VKI_PAGE_SIZE; // Unaddressable, - skip it. |
| 1014 | # else |
| 1015 | // On other platforms, just skip one Addr. |
philippe | 7a76f4b | 2013-10-06 21:23:04 +0000 | [diff] [blame] | 1016 | lc_sig_skipped_szB += sizeof(Addr); |
| 1017 | tl_assert(bad_scanned_addr >= VG_ROUNDUP(start, sizeof(Addr))); |
| 1018 | tl_assert(bad_scanned_addr < VG_ROUNDDN(start+len, sizeof(Addr))); |
| 1019 | ptr = bad_scanned_addr + sizeof(Addr); // Unaddressable, - skip it. |
philippe | 110c77e | 2013-10-15 21:04:56 +0000 | [diff] [blame] | 1020 | #endif |
philippe | 7a76f4b | 2013-10-06 21:23:04 +0000 | [diff] [blame] | 1021 | } |
sewardj | 05fe85e | 2005-04-27 22:46:36 +0000 | [diff] [blame] | 1022 | while (ptr < end) { |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1023 | Addr addr; |
| 1024 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1025 | // Skip invalid chunks. |
philippe | 57a16a2 | 2012-07-18 22:26:51 +0000 | [diff] [blame] | 1026 | if (UNLIKELY((ptr % SM_SIZE) == 0)) { |
| 1027 | if (! MC_(is_within_valid_secondary)(ptr) ) { |
| 1028 | ptr = VG_ROUNDUP(ptr+1, SM_SIZE); |
| 1029 | continue; |
| 1030 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1031 | } |
| 1032 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1033 | // Look to see if this page seems reasonable. |
philippe | 57a16a2 | 2012-07-18 22:26:51 +0000 | [diff] [blame] | 1034 | if (UNLIKELY((ptr % VKI_PAGE_SIZE) == 0)) { |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1035 | if (!VG_(am_is_valid_for_client)(ptr, sizeof(Addr), VKI_PROT_READ)) { |
| 1036 | ptr += VKI_PAGE_SIZE; // Bad page - skip it. |
| 1037 | continue; |
| 1038 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1039 | } |
| 1040 | |
philippe | 57a16a2 | 2012-07-18 22:26:51 +0000 | [diff] [blame] | 1041 | if ( MC_(is_valid_aligned_word)(ptr) ) { |
| 1042 | lc_scanned_szB += sizeof(Addr); |
philippe | 7a76f4b | 2013-10-06 21:23:04 +0000 | [diff] [blame] | 1043 | // If the below read fails, we will longjmp to the loop begin. |
philippe | 57a16a2 | 2012-07-18 22:26:51 +0000 | [diff] [blame] | 1044 | addr = *(Addr *)ptr; |
| 1045 | // If we get here, the scanned word is in valid memory. Now |
| 1046 | // let's see if its contents point to a chunk. |
| 1047 | if (UNLIKELY(searched)) { |
| 1048 | if (addr >= searched && addr < searched + szB) { |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1049 | if (addr == searched) { |
philippe | 57a16a2 | 2012-07-18 22:26:51 +0000 | [diff] [blame] | 1050 | VG_(umsg)("*%#lx points at %#lx\n", ptr, searched); |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1051 | MC_(pp_describe_addr) (ptr); |
| 1052 | } else { |
| 1053 | Int ch_no; |
| 1054 | MC_Chunk *ch; |
| 1055 | LC_Extra *ex; |
philippe | 57a16a2 | 2012-07-18 22:26:51 +0000 | [diff] [blame] | 1056 | VG_(umsg)("*%#lx interior points at %lu bytes inside %#lx\n", |
| 1057 | ptr, (long unsigned) addr - searched, searched); |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1058 | MC_(pp_describe_addr) (ptr); |
| 1059 | if (lc_is_a_chunk_ptr(addr, &ch_no, &ch, &ex) ) { |
| 1060 | Int h; |
| 1061 | for (h = LchStdString; h <= LchMultipleInheritance; h++) { |
| 1062 | if (heuristic_reachedness(addr, ch, ex, H2S(h)) == h) { |
| 1063 | VG_(umsg)("block at %#lx considered reachable " |
| 1064 | "by ptr %#lx using %s heuristic\n", |
| 1065 | ch->data, addr, pp_heuristic(h)); |
| 1066 | } |
| 1067 | } |
philippe | 7a76f4b | 2013-10-06 21:23:04 +0000 | [diff] [blame] | 1068 | // Verify the loop above has properly scanned all |
| 1069 | // heuristics. If the below fails, it probably means the |
| 1070 | // LeakCheckHeuristic enum is not in sync anymore with the |
| 1071 | // above loop and/or with N_LEAK_CHECK_HEURISTICS. |
philippe | 5bd4060 | 2013-10-02 20:59:05 +0000 | [diff] [blame] | 1072 | tl_assert (h == N_LEAK_CHECK_HEURISTICS); |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1073 | } |
| 1074 | } |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1075 | } |
philippe | 57a16a2 | 2012-07-18 22:26:51 +0000 | [diff] [blame] | 1076 | } else { |
| 1077 | lc_push_if_a_chunk_ptr(addr, clique, cur_clique, is_prior_definite); |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1078 | } |
philippe | 57a16a2 | 2012-07-18 22:26:51 +0000 | [diff] [blame] | 1079 | } else if (0 && VG_DEBUG_LEAKCHECK) { |
| 1080 | VG_(printf)("%#lx not valid\n", ptr); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1081 | } |
philippe | 57a16a2 | 2012-07-18 22:26:51 +0000 | [diff] [blame] | 1082 | ptr += sizeof(Addr); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1083 | } |
| 1084 | |
| 1085 | VG_(sigprocmask)(VKI_SIG_SETMASK, &sigmask, NULL); |
| 1086 | VG_(set_fault_catcher)(NULL); |
| 1087 | } |
| 1088 | |
sewardj | 45d94cc | 2005-04-20 14:44:11 +0000 | [diff] [blame] | 1089 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1090 | // Process the mark stack until empty. |
| 1091 | static void lc_process_markstack(Int clique) |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1092 | { |
njn | e3675d6 | 2009-05-19 02:08:25 +0000 | [diff] [blame] | 1093 | Int top = -1; // shut gcc up |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1094 | Bool is_prior_definite; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1095 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1096 | while (lc_pop(&top)) { |
tom | 1d0f3f6 | 2010-10-04 20:55:21 +0000 | [diff] [blame] | 1097 | tl_assert(top >= 0 && top < lc_n_chunks); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1098 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1099 | // See comment about 'is_prior_definite' at the top to understand this. |
| 1100 | is_prior_definite = ( Possible != lc_extras[top].state ); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1101 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1102 | lc_scan_memory(lc_chunks[top]->data, lc_chunks[top]->szB, |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1103 | is_prior_definite, clique, (clique == -1 ? -1 : top), |
| 1104 | /*searched*/ 0, 0); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1105 | } |
| 1106 | } |
| 1107 | |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1108 | static Word cmp_LossRecordKey_LossRecord(const void* key, const void* elem) |
| 1109 | { |
florian | 3e79863 | 2012-11-24 19:41:54 +0000 | [diff] [blame] | 1110 | const LossRecordKey* a = key; |
| 1111 | const LossRecordKey* b = &(((const LossRecord*)elem)->key); |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1112 | |
| 1113 | // Compare on states first because that's fast. |
| 1114 | if (a->state < b->state) return -1; |
| 1115 | if (a->state > b->state) return 1; |
| 1116 | // Ok, the states are equal. Now compare the locations, which is slower. |
| 1117 | if (VG_(eq_ExeContext)( |
| 1118 | MC_(clo_leak_resolution), a->allocated_at, b->allocated_at)) |
| 1119 | return 0; |
| 1120 | // Different locations. Ordering is arbitrary, just use the ec pointer. |
| 1121 | if (a->allocated_at < b->allocated_at) return -1; |
| 1122 | if (a->allocated_at > b->allocated_at) return 1; |
| 1123 | VG_(tool_panic)("bad LossRecord comparison"); |
| 1124 | } |
| 1125 | |
florian | 6bd9dc1 | 2012-11-23 16:17:43 +0000 | [diff] [blame] | 1126 | static Int cmp_LossRecords(const void* va, const void* vb) |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1127 | { |
florian | 3e79863 | 2012-11-24 19:41:54 +0000 | [diff] [blame] | 1128 | const LossRecord* lr_a = *(const LossRecord *const *)va; |
| 1129 | const LossRecord* lr_b = *(const LossRecord *const *)vb; |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1130 | SizeT total_szB_a = lr_a->szB + lr_a->indirect_szB; |
| 1131 | SizeT total_szB_b = lr_b->szB + lr_b->indirect_szB; |
| 1132 | |
| 1133 | // First compare by sizes. |
| 1134 | if (total_szB_a < total_szB_b) return -1; |
| 1135 | if (total_szB_a > total_szB_b) return 1; |
| 1136 | // If size are equal, compare by states. |
| 1137 | if (lr_a->key.state < lr_b->key.state) return -1; |
| 1138 | if (lr_a->key.state > lr_b->key.state) return 1; |
njn | e10c7f8 | 2009-05-06 06:52:47 +0000 | [diff] [blame] | 1139 | // If they're still equal here, it doesn't matter that much, but we keep |
| 1140 | // comparing other things so that regtests are as deterministic as |
| 1141 | // possible. So: compare num_blocks. |
| 1142 | if (lr_a->num_blocks < lr_b->num_blocks) return -1; |
| 1143 | if (lr_a->num_blocks > lr_b->num_blocks) return 1; |
| 1144 | // Finally, compare ExeContext addresses... older ones are likely to have |
| 1145 | // lower addresses. |
| 1146 | if (lr_a->key.allocated_at < lr_b->key.allocated_at) return -1; |
| 1147 | if (lr_a->key.allocated_at > lr_b->key.allocated_at) return 1; |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1148 | return 0; |
| 1149 | } |
| 1150 | |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1151 | // allocates or reallocates lr_array, and set its elements to the loss records |
| 1152 | // contains in lr_table. |
| 1153 | static Int get_lr_array_from_lr_table(void) { |
| 1154 | Int i, n_lossrecords; |
| 1155 | LossRecord* lr; |
| 1156 | |
| 1157 | n_lossrecords = VG_(OSetGen_Size)(lr_table); |
| 1158 | |
| 1159 | // (re-)create the array of pointers to the loss records. |
| 1160 | // lr_array is kept to allow producing the block list from gdbserver. |
| 1161 | if (lr_array != NULL) |
| 1162 | VG_(free)(lr_array); |
| 1163 | lr_array = VG_(malloc)("mc.pr.2", n_lossrecords * sizeof(LossRecord*)); |
| 1164 | i = 0; |
| 1165 | VG_(OSetGen_ResetIter)(lr_table); |
| 1166 | while ( (lr = VG_(OSetGen_Next)(lr_table)) ) { |
| 1167 | lr_array[i++] = lr; |
| 1168 | } |
| 1169 | tl_assert(i == n_lossrecords); |
| 1170 | return n_lossrecords; |
| 1171 | } |
| 1172 | |
philippe | 8423490 | 2012-01-14 13:53:13 +0000 | [diff] [blame] | 1173 | |
| 1174 | static void get_printing_rules(LeakCheckParams* lcp, |
| 1175 | LossRecord* lr, |
| 1176 | Bool* count_as_error, |
| 1177 | Bool* print_record) |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1178 | { |
philippe | 8423490 | 2012-01-14 13:53:13 +0000 | [diff] [blame] | 1179 | // Rules for printing: |
| 1180 | // - We don't show suppressed loss records ever (and that's controlled |
| 1181 | // within the error manager). |
philippe | 2193a7c | 2012-12-08 17:54:16 +0000 | [diff] [blame] | 1182 | // - We show non-suppressed loss records that are specified in |
| 1183 | // --show-leak-kinds=... if --leak-check=yes. |
philippe | 8423490 | 2012-01-14 13:53:13 +0000 | [diff] [blame] | 1184 | |
| 1185 | Bool delta_considered; |
| 1186 | |
| 1187 | switch (lcp->deltamode) { |
| 1188 | case LCD_Any: |
| 1189 | delta_considered = lr->num_blocks > 0; |
| 1190 | break; |
| 1191 | case LCD_Increased: |
| 1192 | delta_considered |
| 1193 | = lr->szB > lr->old_szB |
| 1194 | || lr->indirect_szB > lr->old_indirect_szB |
| 1195 | || lr->num_blocks > lr->old_num_blocks; |
| 1196 | break; |
| 1197 | case LCD_Changed: |
| 1198 | delta_considered = lr->szB != lr->old_szB |
| 1199 | || lr->indirect_szB != lr->old_indirect_szB |
| 1200 | || lr->num_blocks != lr->old_num_blocks; |
| 1201 | break; |
| 1202 | default: |
| 1203 | tl_assert(0); |
| 1204 | } |
| 1205 | |
philippe | 2193a7c | 2012-12-08 17:54:16 +0000 | [diff] [blame] | 1206 | *print_record = lcp->mode == LC_Full && delta_considered |
| 1207 | && RiS(lr->key.state,lcp->show_leak_kinds); |
philippe | 8423490 | 2012-01-14 13:53:13 +0000 | [diff] [blame] | 1208 | // We don't count a leaks as errors with lcp->mode==LC_Summary. |
| 1209 | // Otherwise you can get high error counts with few or no error |
philippe | 2193a7c | 2012-12-08 17:54:16 +0000 | [diff] [blame] | 1210 | // messages, which can be confusing. Otherwise, we count as errors |
| 1211 | // the leak kinds requested by --errors-for-leak-kinds=... |
| 1212 | *count_as_error = lcp->mode == LC_Full && delta_considered |
| 1213 | && RiS(lr->key.state,lcp->errors_for_leak_kinds); |
philippe | 8423490 | 2012-01-14 13:53:13 +0000 | [diff] [blame] | 1214 | } |
| 1215 | |
| 1216 | static void print_results(ThreadId tid, LeakCheckParams* lcp) |
| 1217 | { |
| 1218 | Int i, n_lossrecords, start_lr_output_scan; |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1219 | LossRecord* lr; |
| 1220 | Bool is_suppressed; |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1221 | /* old_* variables are used to report delta in summary. */ |
| 1222 | SizeT old_bytes_leaked = MC_(bytes_leaked); |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1223 | SizeT old_bytes_indirect = MC_(bytes_indirect); |
| 1224 | SizeT old_bytes_dubious = MC_(bytes_dubious); |
| 1225 | SizeT old_bytes_reachable = MC_(bytes_reachable); |
| 1226 | SizeT old_bytes_suppressed = MC_(bytes_suppressed); |
| 1227 | SizeT old_blocks_leaked = MC_(blocks_leaked); |
| 1228 | SizeT old_blocks_indirect = MC_(blocks_indirect); |
| 1229 | SizeT old_blocks_dubious = MC_(blocks_dubious); |
| 1230 | SizeT old_blocks_reachable = MC_(blocks_reachable); |
| 1231 | SizeT old_blocks_suppressed = MC_(blocks_suppressed); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1232 | |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1233 | SizeT old_bytes_heuristically_reachable[N_LEAK_CHECK_HEURISTICS]; |
| 1234 | SizeT old_blocks_heuristically_reachable[N_LEAK_CHECK_HEURISTICS]; |
| 1235 | |
| 1236 | for (i = 0; i < N_LEAK_CHECK_HEURISTICS; i++) { |
| 1237 | old_bytes_heuristically_reachable[i] |
| 1238 | = MC_(bytes_heuristically_reachable)[i]; |
| 1239 | MC_(bytes_heuristically_reachable)[i] = 0; |
| 1240 | old_blocks_heuristically_reachable[i] |
| 1241 | = MC_(blocks_heuristically_reachable)[i]; |
| 1242 | MC_(blocks_heuristically_reachable)[i] = 0; |
| 1243 | } |
| 1244 | |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1245 | if (lr_table == NULL) |
| 1246 | // Create the lr_table, which holds the loss records. |
| 1247 | // If the lr_table already exists, it means it contains |
| 1248 | // loss_records from the previous leak search. The old_* |
| 1249 | // values in these records are used to implement the |
| 1250 | // leak check delta mode |
| 1251 | lr_table = |
| 1252 | VG_(OSetGen_Create)(offsetof(LossRecord, key), |
| 1253 | cmp_LossRecordKey_LossRecord, |
| 1254 | VG_(malloc), "mc.pr.1", |
| 1255 | VG_(free)); |
| 1256 | |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1257 | // If we have loss records from a previous search, reset values to have |
| 1258 | // proper printing of the deltas between previous search and this search. |
| 1259 | n_lossrecords = get_lr_array_from_lr_table(); |
| 1260 | for (i = 0; i < n_lossrecords; i++) { |
philippe | 4bbfc5f | 2012-02-27 21:52:45 +0000 | [diff] [blame] | 1261 | if (lr_array[i]->num_blocks == 0) { |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1262 | // remove from lr_table the old loss_records with 0 bytes found |
| 1263 | VG_(OSetGen_Remove) (lr_table, &lr_array[i]->key); |
philippe | 4bbfc5f | 2012-02-27 21:52:45 +0000 | [diff] [blame] | 1264 | VG_(OSetGen_FreeNode)(lr_table, lr_array[i]); |
| 1265 | } else { |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1266 | // move the leak sizes to old_* and zero the current sizes |
| 1267 | // for next leak search |
| 1268 | lr_array[i]->old_szB = lr_array[i]->szB; |
| 1269 | lr_array[i]->old_indirect_szB = lr_array[i]->indirect_szB; |
| 1270 | lr_array[i]->old_num_blocks = lr_array[i]->num_blocks; |
| 1271 | lr_array[i]->szB = 0; |
| 1272 | lr_array[i]->indirect_szB = 0; |
| 1273 | lr_array[i]->num_blocks = 0; |
| 1274 | } |
| 1275 | } |
| 1276 | // lr_array now contains "invalid" loss records => free it. |
| 1277 | // lr_array will be re-created below with the kept and new loss records. |
| 1278 | VG_(free) (lr_array); |
| 1279 | lr_array = NULL; |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1280 | |
| 1281 | // Convert the chunks into loss records, merging them where appropriate. |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1282 | for (i = 0; i < lc_n_chunks; i++) { |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1283 | MC_Chunk* ch = lc_chunks[i]; |
| 1284 | LC_Extra* ex = &(lc_extras)[i]; |
| 1285 | LossRecord* old_lr; |
| 1286 | LossRecordKey lrkey; |
| 1287 | lrkey.state = ex->state; |
philippe | 8617b5b | 2013-01-12 19:53:08 +0000 | [diff] [blame] | 1288 | lrkey.allocated_at = MC_(allocated_at)(ch); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1289 | |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1290 | if (ex->heuristic) { |
| 1291 | MC_(bytes_heuristically_reachable)[ex->heuristic] += ch->szB; |
| 1292 | MC_(blocks_heuristically_reachable)[ex->heuristic]++; |
| 1293 | if (VG_DEBUG_LEAKCHECK) |
| 1294 | VG_(printf)("heuristic %s %#lx len %lu\n", |
| 1295 | pp_heuristic(ex->heuristic), |
| 1296 | ch->data, (unsigned long)ch->szB); |
| 1297 | } |
| 1298 | |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1299 | old_lr = VG_(OSetGen_Lookup)(lr_table, &lrkey); |
| 1300 | if (old_lr) { |
| 1301 | // We found an existing loss record matching this chunk. Update the |
| 1302 | // loss record's details in-situ. This is safe because we don't |
| 1303 | // change the elements used as the OSet key. |
| 1304 | old_lr->szB += ch->szB; |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1305 | if (ex->state == Unreached) |
| 1306 | old_lr->indirect_szB += ex->IorC.indirect_szB; |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1307 | old_lr->num_blocks++; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1308 | } else { |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1309 | // No existing loss record matches this chunk. Create a new loss |
| 1310 | // record, initialise it from the chunk, and insert it into lr_table. |
| 1311 | lr = VG_(OSetGen_AllocNode)(lr_table, sizeof(LossRecord)); |
| 1312 | lr->key = lrkey; |
| 1313 | lr->szB = ch->szB; |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1314 | if (ex->state == Unreached) |
| 1315 | lr->indirect_szB = ex->IorC.indirect_szB; |
| 1316 | else |
| 1317 | lr->indirect_szB = 0; |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1318 | lr->num_blocks = 1; |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1319 | lr->old_szB = 0; |
| 1320 | lr->old_indirect_szB = 0; |
| 1321 | lr->old_num_blocks = 0; |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1322 | VG_(OSetGen_Insert)(lr_table, lr); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1323 | } |
| 1324 | } |
| 1325 | |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1326 | // (re-)create the array of pointers to the (new) loss records. |
| 1327 | n_lossrecords = get_lr_array_from_lr_table (); |
| 1328 | tl_assert(VG_(OSetGen_Size)(lr_table) == n_lossrecords); |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1329 | |
| 1330 | // Sort the array by loss record sizes. |
| 1331 | VG_(ssort)(lr_array, n_lossrecords, sizeof(LossRecord*), |
| 1332 | cmp_LossRecords); |
| 1333 | |
| 1334 | // Zero totals. |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1335 | MC_(blocks_leaked) = MC_(bytes_leaked) = 0; |
| 1336 | MC_(blocks_indirect) = MC_(bytes_indirect) = 0; |
| 1337 | MC_(blocks_dubious) = MC_(bytes_dubious) = 0; |
| 1338 | MC_(blocks_reachable) = MC_(bytes_reachable) = 0; |
| 1339 | MC_(blocks_suppressed) = MC_(bytes_suppressed) = 0; |
| 1340 | |
philippe | 8423490 | 2012-01-14 13:53:13 +0000 | [diff] [blame] | 1341 | // If there is a maximum nr of loss records we can output, then first |
| 1342 | // compute from where the output scan has to start. |
| 1343 | // By default, start from the first loss record. Compute a higher |
| 1344 | // value if there is a maximum to respect. We need to print the last |
| 1345 | // records, as the one with the biggest sizes are more interesting. |
| 1346 | start_lr_output_scan = 0; |
| 1347 | if (lcp->mode == LC_Full && lcp->max_loss_records_output < n_lossrecords) { |
| 1348 | Int nr_printable_records = 0; |
| 1349 | for (i = n_lossrecords - 1; i >= 0 && start_lr_output_scan == 0; i--) { |
| 1350 | Bool count_as_error, print_record; |
| 1351 | lr = lr_array[i]; |
| 1352 | get_printing_rules (lcp, lr, &count_as_error, &print_record); |
| 1353 | // Do not use get_printing_rules results for is_suppressed, as we |
| 1354 | // only want to check if the record would be suppressed. |
| 1355 | is_suppressed = |
| 1356 | MC_(record_leak_error) ( tid, i+1, n_lossrecords, lr, |
| 1357 | False /* print_record */, |
| 1358 | False /* count_as_error */); |
| 1359 | if (print_record && !is_suppressed) { |
| 1360 | nr_printable_records++; |
| 1361 | if (nr_printable_records == lcp->max_loss_records_output) |
| 1362 | start_lr_output_scan = i; |
| 1363 | } |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1364 | } |
philippe | 8423490 | 2012-01-14 13:53:13 +0000 | [diff] [blame] | 1365 | } |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1366 | |
philippe | 8423490 | 2012-01-14 13:53:13 +0000 | [diff] [blame] | 1367 | // Print the loss records (in size order) and collect summary stats. |
| 1368 | for (i = start_lr_output_scan; i < n_lossrecords; i++) { |
| 1369 | Bool count_as_error, print_record; |
| 1370 | lr = lr_array[i]; |
| 1371 | get_printing_rules(lcp, lr, &count_as_error, &print_record); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1372 | is_suppressed = |
njn | 18afe5d | 2009-08-10 08:25:39 +0000 | [diff] [blame] | 1373 | MC_(record_leak_error) ( tid, i+1, n_lossrecords, lr, print_record, |
| 1374 | count_as_error ); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1375 | |
| 1376 | if (is_suppressed) { |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1377 | MC_(blocks_suppressed) += lr->num_blocks; |
| 1378 | MC_(bytes_suppressed) += lr->szB; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1379 | |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1380 | } else if (Unreached == lr->key.state) { |
| 1381 | MC_(blocks_leaked) += lr->num_blocks; |
| 1382 | MC_(bytes_leaked) += lr->szB; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1383 | |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1384 | } else if (IndirectLeak == lr->key.state) { |
| 1385 | MC_(blocks_indirect) += lr->num_blocks; |
| 1386 | MC_(bytes_indirect) += lr->szB; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1387 | |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1388 | } else if (Possible == lr->key.state) { |
| 1389 | MC_(blocks_dubious) += lr->num_blocks; |
| 1390 | MC_(bytes_dubious) += lr->szB; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1391 | |
njn | 29a5c01 | 2009-05-06 06:15:55 +0000 | [diff] [blame] | 1392 | } else if (Reachable == lr->key.state) { |
| 1393 | MC_(blocks_reachable) += lr->num_blocks; |
| 1394 | MC_(bytes_reachable) += lr->szB; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1395 | |
| 1396 | } else { |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1397 | VG_(tool_panic)("unknown loss mode"); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1398 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1399 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1400 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1401 | if (VG_(clo_verbosity) > 0 && !VG_(clo_xml)) { |
florian | 19f91bb | 2012-11-10 22:29:54 +0000 | [diff] [blame] | 1402 | HChar d_bytes[20]; |
| 1403 | HChar d_blocks[20]; |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1404 | # define DBY(new,old) \ |
| 1405 | MC_(snprintf_delta) (d_bytes, 20, (new), (old), lcp->deltamode) |
| 1406 | # define DBL(new,old) \ |
| 1407 | MC_(snprintf_delta) (d_blocks, 20, (new), (old), lcp->deltamode) |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1408 | |
sewardj | 6b523cd | 2009-07-15 14:49:40 +0000 | [diff] [blame] | 1409 | VG_(umsg)("LEAK SUMMARY:\n"); |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1410 | VG_(umsg)(" definitely lost: %'lu%s bytes in %'lu%s blocks\n", |
| 1411 | MC_(bytes_leaked), |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1412 | DBY (MC_(bytes_leaked), old_bytes_leaked), |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1413 | MC_(blocks_leaked), |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1414 | DBL (MC_(blocks_leaked), old_blocks_leaked)); |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1415 | VG_(umsg)(" indirectly lost: %'lu%s bytes in %'lu%s blocks\n", |
| 1416 | MC_(bytes_indirect), |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1417 | DBY (MC_(bytes_indirect), old_bytes_indirect), |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1418 | MC_(blocks_indirect), |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1419 | DBL (MC_(blocks_indirect), old_blocks_indirect)); |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1420 | VG_(umsg)(" possibly lost: %'lu%s bytes in %'lu%s blocks\n", |
| 1421 | MC_(bytes_dubious), |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1422 | DBY (MC_(bytes_dubious), old_bytes_dubious), |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1423 | MC_(blocks_dubious), |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1424 | DBL (MC_(blocks_dubious), old_blocks_dubious)); |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1425 | VG_(umsg)(" still reachable: %'lu%s bytes in %'lu%s blocks\n", |
| 1426 | MC_(bytes_reachable), |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1427 | DBY (MC_(bytes_reachable), old_bytes_reachable), |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1428 | MC_(blocks_reachable), |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1429 | DBL (MC_(blocks_reachable), old_blocks_reachable)); |
| 1430 | for (i = 0; i < N_LEAK_CHECK_HEURISTICS; i++) |
| 1431 | if (old_blocks_heuristically_reachable[i] > 0 |
| 1432 | || MC_(blocks_heuristically_reachable)[i] > 0) { |
| 1433 | VG_(umsg)(" of which " |
| 1434 | "reachable via heuristic:\n"); |
| 1435 | break; |
| 1436 | } |
| 1437 | for (i = 0; i < N_LEAK_CHECK_HEURISTICS; i++) |
| 1438 | if (old_blocks_heuristically_reachable[i] > 0 |
| 1439 | || MC_(blocks_heuristically_reachable)[i] > 0) |
| 1440 | VG_(umsg)(" %19s: " |
| 1441 | "%'lu%s bytes in %'lu%s blocks\n", |
| 1442 | pp_heuristic(i), |
| 1443 | MC_(bytes_heuristically_reachable)[i], |
| 1444 | DBY (MC_(bytes_heuristically_reachable)[i], |
| 1445 | old_bytes_heuristically_reachable[i]), |
| 1446 | MC_(blocks_heuristically_reachable)[i], |
| 1447 | DBL (MC_(blocks_heuristically_reachable)[i], |
| 1448 | old_blocks_heuristically_reachable[i])); |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1449 | VG_(umsg)(" suppressed: %'lu%s bytes in %'lu%s blocks\n", |
| 1450 | MC_(bytes_suppressed), |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1451 | DBY (MC_(bytes_suppressed), old_bytes_suppressed), |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1452 | MC_(blocks_suppressed), |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1453 | DBL (MC_(blocks_suppressed), old_blocks_suppressed)); |
philippe | 8423490 | 2012-01-14 13:53:13 +0000 | [diff] [blame] | 1454 | if (lcp->mode != LC_Full && |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1455 | (MC_(blocks_leaked) + MC_(blocks_indirect) + |
| 1456 | MC_(blocks_dubious) + MC_(blocks_reachable)) > 0) { |
philippe | 8423490 | 2012-01-14 13:53:13 +0000 | [diff] [blame] | 1457 | if (lcp->requested_by_monitor_command) |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1458 | VG_(umsg)("To see details of leaked memory, " |
| 1459 | "give 'full' arg to leak_check\n"); |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1460 | else |
| 1461 | VG_(umsg)("Rerun with --leak-check=full to see details " |
| 1462 | "of leaked memory\n"); |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1463 | } |
philippe | 8423490 | 2012-01-14 13:53:13 +0000 | [diff] [blame] | 1464 | if (lcp->mode == LC_Full && |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1465 | MC_(blocks_reachable) > 0 && !RiS(Reachable,lcp->show_leak_kinds)) { |
sewardj | 6b523cd | 2009-07-15 14:49:40 +0000 | [diff] [blame] | 1466 | VG_(umsg)("Reachable blocks (those to which a pointer " |
| 1467 | "was found) are not shown.\n"); |
philippe | 8423490 | 2012-01-14 13:53:13 +0000 | [diff] [blame] | 1468 | if (lcp->requested_by_monitor_command) |
sewardj | 30b3eca | 2011-06-28 08:20:39 +0000 | [diff] [blame] | 1469 | VG_(umsg)("To see them, add 'reachable any' args to leak_check\n"); |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1470 | else |
| 1471 | VG_(umsg)("To see them, rerun with: --leak-check=full " |
philippe | 2193a7c | 2012-12-08 17:54:16 +0000 | [diff] [blame] | 1472 | "--show-leak-kinds=all\n"); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1473 | } |
njn | b6267bd | 2009-08-12 00:14:16 +0000 | [diff] [blame] | 1474 | VG_(umsg)("\n"); |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1475 | #undef DBL |
| 1476 | #undef DBY |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1477 | } |
| 1478 | } |
| 1479 | |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1480 | // print recursively all indirectly leaked blocks collected in clique. |
| 1481 | static void print_clique (Int clique, UInt level) |
| 1482 | { |
| 1483 | Int ind; |
| 1484 | Int i, n_lossrecords;; |
| 1485 | |
| 1486 | n_lossrecords = VG_(OSetGen_Size)(lr_table); |
| 1487 | |
| 1488 | for (ind = 0; ind < lc_n_chunks; ind++) { |
| 1489 | LC_Extra* ind_ex = &(lc_extras)[ind]; |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1490 | if (ind_ex->state == IndirectLeak |
| 1491 | && ind_ex->IorC.clique == (SizeT) clique) { |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1492 | MC_Chunk* ind_ch = lc_chunks[ind]; |
| 1493 | LossRecord* ind_lr; |
| 1494 | LossRecordKey ind_lrkey; |
| 1495 | Int lr_i; |
| 1496 | ind_lrkey.state = ind_ex->state; |
philippe | 8617b5b | 2013-01-12 19:53:08 +0000 | [diff] [blame] | 1497 | ind_lrkey.allocated_at = MC_(allocated_at)(ind_ch); |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1498 | ind_lr = VG_(OSetGen_Lookup)(lr_table, &ind_lrkey); |
| 1499 | for (lr_i = 0; lr_i < n_lossrecords; lr_i++) |
| 1500 | if (ind_lr == lr_array[lr_i]) |
| 1501 | break; |
| 1502 | for (i = 0; i < level; i++) |
| 1503 | VG_(umsg)(" "); |
| 1504 | VG_(umsg)("%p[%lu] indirect loss record %d\n", |
| 1505 | (void *)ind_ch->data, (unsigned long)ind_ch->szB, |
| 1506 | lr_i+1); // lr_i+1 for user numbering. |
| 1507 | if (lr_i >= n_lossrecords) |
| 1508 | VG_(umsg) |
| 1509 | ("error: no indirect loss record found for %p[%lu]?????\n", |
| 1510 | (void *)ind_ch->data, (unsigned long)ind_ch->szB); |
| 1511 | print_clique(ind, level+1); |
| 1512 | } |
| 1513 | } |
| 1514 | } |
| 1515 | |
| 1516 | Bool MC_(print_block_list) ( UInt loss_record_nr) |
| 1517 | { |
| 1518 | Int i, n_lossrecords; |
| 1519 | LossRecord* lr; |
| 1520 | |
| 1521 | if (lr_table == NULL || lc_chunks == NULL || lc_extras == NULL) { |
| 1522 | VG_(umsg)("Can't print block list : no valid leak search result\n"); |
| 1523 | return False; |
| 1524 | } |
| 1525 | |
| 1526 | if (lc_chunks_n_frees_marker != MC_(get_cmalloc_n_frees)()) { |
| 1527 | VG_(umsg)("Can't print obsolete block list : redo a leak search first\n"); |
| 1528 | return False; |
| 1529 | } |
| 1530 | |
| 1531 | n_lossrecords = VG_(OSetGen_Size)(lr_table); |
| 1532 | if (loss_record_nr >= n_lossrecords) |
| 1533 | return False; // Invalid loss record nr. |
| 1534 | |
| 1535 | tl_assert (lr_array); |
| 1536 | lr = lr_array[loss_record_nr]; |
| 1537 | |
| 1538 | // (re-)print the loss record details. |
| 1539 | // (+1 on loss_record_nr as user numbering for loss records starts at 1). |
| 1540 | MC_(pp_LossRecord)(loss_record_nr+1, n_lossrecords, lr); |
| 1541 | |
| 1542 | // Match the chunks with loss records. |
| 1543 | for (i = 0; i < lc_n_chunks; i++) { |
| 1544 | MC_Chunk* ch = lc_chunks[i]; |
| 1545 | LC_Extra* ex = &(lc_extras)[i]; |
| 1546 | LossRecord* old_lr; |
| 1547 | LossRecordKey lrkey; |
| 1548 | lrkey.state = ex->state; |
philippe | 8617b5b | 2013-01-12 19:53:08 +0000 | [diff] [blame] | 1549 | lrkey.allocated_at = MC_(allocated_at)(ch); |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1550 | |
| 1551 | old_lr = VG_(OSetGen_Lookup)(lr_table, &lrkey); |
| 1552 | if (old_lr) { |
| 1553 | // We found an existing loss record matching this chunk. |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1554 | // If this is the loss record we are looking for, output the pointer. |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1555 | if (old_lr == lr_array[loss_record_nr]) { |
| 1556 | VG_(umsg)("%p[%lu]\n", |
| 1557 | (void *)ch->data, (unsigned long) ch->szB); |
| 1558 | if (ex->state != Reachable) { |
| 1559 | // We can print the clique in all states, except Reachable. |
| 1560 | // In Unreached state, lc_chunk[i] is the clique leader. |
| 1561 | // In IndirectLeak, lc_chunk[i] might have been a clique leader |
| 1562 | // which was later collected in another clique. |
| 1563 | // For Possible, lc_chunk[i] might be the top of a clique |
| 1564 | // or an intermediate clique. |
| 1565 | print_clique(i, 1); |
| 1566 | } |
| 1567 | } |
| 1568 | } else { |
| 1569 | // No existing loss record matches this chunk ??? |
| 1570 | VG_(umsg)("error: no loss record found for %p[%lu]?????\n", |
| 1571 | (void *)ch->data, (unsigned long) ch->szB); |
| 1572 | } |
| 1573 | } |
| 1574 | return True; |
| 1575 | } |
| 1576 | |
| 1577 | // If searched = 0, scan memory root set, pushing onto the mark stack the blocks |
| 1578 | // encountered. |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1579 | // Otherwise (searched != 0), scan the memory root set searching for ptr |
| 1580 | // pointing inside [searched, searched+szB[. |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1581 | static void scan_memory_root_set(Addr searched, SizeT szB) |
| 1582 | { |
| 1583 | Int i; |
| 1584 | Int n_seg_starts; |
| 1585 | Addr* seg_starts = VG_(get_segment_starts)( &n_seg_starts ); |
| 1586 | |
| 1587 | tl_assert(seg_starts && n_seg_starts > 0); |
| 1588 | |
| 1589 | lc_scanned_szB = 0; |
philippe | 7a76f4b | 2013-10-06 21:23:04 +0000 | [diff] [blame] | 1590 | lc_sig_skipped_szB = 0; |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1591 | |
| 1592 | // VG_(am_show_nsegments)( 0, "leakcheck"); |
| 1593 | for (i = 0; i < n_seg_starts; i++) { |
| 1594 | SizeT seg_size; |
| 1595 | NSegment const* seg = VG_(am_find_nsegment)( seg_starts[i] ); |
| 1596 | tl_assert(seg); |
| 1597 | |
| 1598 | if (seg->kind != SkFileC && seg->kind != SkAnonC) continue; |
| 1599 | if (!(seg->hasR && seg->hasW)) continue; |
| 1600 | if (seg->isCH) continue; |
| 1601 | |
| 1602 | // Don't poke around in device segments as this may cause |
| 1603 | // hangs. Exclude /dev/zero just in case someone allocated |
| 1604 | // memory by explicitly mapping /dev/zero. |
| 1605 | if (seg->kind == SkFileC |
| 1606 | && (VKI_S_ISCHR(seg->mode) || VKI_S_ISBLK(seg->mode))) { |
florian | 3e79863 | 2012-11-24 19:41:54 +0000 | [diff] [blame] | 1607 | HChar* dev_name = VG_(am_get_filename)( seg ); |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1608 | if (dev_name && 0 == VG_(strcmp)(dev_name, "/dev/zero")) { |
| 1609 | // Don't skip /dev/zero. |
| 1610 | } else { |
| 1611 | // Skip this device mapping. |
| 1612 | continue; |
| 1613 | } |
| 1614 | } |
| 1615 | |
| 1616 | if (0) |
| 1617 | VG_(printf)("ACCEPT %2d %#lx %#lx\n", i, seg->start, seg->end); |
| 1618 | |
| 1619 | // Scan the segment. We use -1 for the clique number, because this |
| 1620 | // is a root-set. |
| 1621 | seg_size = seg->end - seg->start + 1; |
| 1622 | if (VG_(clo_verbosity) > 2) { |
| 1623 | VG_(message)(Vg_DebugMsg, |
| 1624 | " Scanning root segment: %#lx..%#lx (%lu)\n", |
| 1625 | seg->start, seg->end, seg_size); |
| 1626 | } |
| 1627 | lc_scan_memory(seg->start, seg_size, /*is_prior_definite*/True, |
| 1628 | /*clique*/-1, /*cur_clique*/-1, |
| 1629 | searched, szB); |
| 1630 | } |
philippe | 7d69fd9 | 2012-02-26 21:26:00 +0000 | [diff] [blame] | 1631 | VG_(free)(seg_starts); |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1632 | } |
| 1633 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1634 | /*------------------------------------------------------------*/ |
| 1635 | /*--- Top-level entry point. ---*/ |
| 1636 | /*------------------------------------------------------------*/ |
sewardj | 3cf26a5 | 2006-07-27 23:48:53 +0000 | [diff] [blame] | 1637 | |
philippe | 8423490 | 2012-01-14 13:53:13 +0000 | [diff] [blame] | 1638 | void MC_(detect_memory_leaks) ( ThreadId tid, LeakCheckParams* lcp) |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 1639 | { |
njn | b965efb | 2009-08-10 07:36:54 +0000 | [diff] [blame] | 1640 | Int i, j; |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 1641 | |
philippe | 8423490 | 2012-01-14 13:53:13 +0000 | [diff] [blame] | 1642 | tl_assert(lcp->mode != LC_Off); |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1643 | |
philippe | 57a16a2 | 2012-07-18 22:26:51 +0000 | [diff] [blame] | 1644 | // Verify some assertions which are used in lc_scan_memory. |
| 1645 | tl_assert((VKI_PAGE_SIZE % sizeof(Addr)) == 0); |
| 1646 | tl_assert((SM_SIZE % sizeof(Addr)) == 0); |
| 1647 | // Above two assertions are critical, while below assertion |
| 1648 | // ensures that the optimisation in the loop is done in the |
| 1649 | // correct order : the loop checks for (big) SM chunk skipping |
| 1650 | // before checking for (smaller) page skipping. |
| 1651 | tl_assert((SM_SIZE % VKI_PAGE_SIZE) == 0); |
| 1652 | |
philippe | 4e32d67 | 2013-10-17 22:10:41 +0000 | [diff] [blame^] | 1653 | MC_(leak_search_gen)++; |
philippe | 8423490 | 2012-01-14 13:53:13 +0000 | [diff] [blame] | 1654 | MC_(detect_memory_leaks_last_delta_mode) = lcp->deltamode; |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1655 | detect_memory_leaks_last_heuristics = lcp->heuristics; |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 1656 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1657 | // Get the chunks, stop if there were none. |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1658 | if (lc_chunks) { |
| 1659 | VG_(free)(lc_chunks); |
| 1660 | lc_chunks = NULL; |
| 1661 | } |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1662 | lc_chunks = find_active_chunks(&lc_n_chunks); |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1663 | lc_chunks_n_frees_marker = MC_(get_cmalloc_n_frees)(); |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1664 | if (lc_n_chunks == 0) { |
| 1665 | tl_assert(lc_chunks == NULL); |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1666 | if (lr_table != NULL) { |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1667 | // forget the previous recorded LossRecords as next leak search |
| 1668 | // can in any case just create new leaks. |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1669 | // Maybe it would be better to rather call print_result ? |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1670 | // (at least when leak decreases are requested) |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1671 | // This will then output all LossRecords with a size decreasing to 0 |
| 1672 | VG_(OSetGen_Destroy) (lr_table); |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1673 | lr_table = NULL; |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1674 | } |
sewardj | 71bc3cb | 2005-05-19 00:25:45 +0000 | [diff] [blame] | 1675 | if (VG_(clo_verbosity) >= 1 && !VG_(clo_xml)) { |
njn | b6267bd | 2009-08-12 00:14:16 +0000 | [diff] [blame] | 1676 | VG_(umsg)("All heap blocks were freed -- no leaks are possible\n"); |
sewardj | 2d9e874 | 2009-08-07 15:46:56 +0000 | [diff] [blame] | 1677 | VG_(umsg)("\n"); |
sewardj | 37d06f2 | 2003-09-17 21:48:26 +0000 | [diff] [blame] | 1678 | } |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 1679 | return; |
| 1680 | } |
| 1681 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1682 | // Sort the array so blocks are in ascending order in memory. |
| 1683 | VG_(ssort)(lc_chunks, lc_n_chunks, sizeof(VgHashNode*), compare_MC_Chunks); |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 1684 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1685 | // Sanity check -- make sure they're in order. |
| 1686 | for (i = 0; i < lc_n_chunks-1; i++) { |
| 1687 | tl_assert( lc_chunks[i]->data <= lc_chunks[i+1]->data); |
| 1688 | } |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 1689 | |
njn | b965efb | 2009-08-10 07:36:54 +0000 | [diff] [blame] | 1690 | // Sanity check -- make sure they don't overlap. The one exception is that |
| 1691 | // we allow a MALLOCLIKE block to sit entirely within a malloc() block. |
| 1692 | // This is for bug 100628. If this occurs, we ignore the malloc() block |
| 1693 | // for leak-checking purposes. This is a hack and probably should be done |
| 1694 | // better, but at least it's consistent with mempools (which are treated |
| 1695 | // like this in find_active_chunks). Mempools have a separate VgHashTable |
| 1696 | // for mempool chunks, but if custom-allocated blocks are put in a separate |
| 1697 | // table from normal heap blocks it makes free-mismatch checking more |
| 1698 | // difficult. |
| 1699 | // |
| 1700 | // If this check fails, it probably means that the application |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1701 | // has done something stupid with VALGRIND_MALLOCLIKE_BLOCK client |
njn | b965efb | 2009-08-10 07:36:54 +0000 | [diff] [blame] | 1702 | // requests, eg. has made overlapping requests (which are |
| 1703 | // nonsensical), or used VALGRIND_MALLOCLIKE_BLOCK for stack locations; |
| 1704 | // again nonsensical. |
| 1705 | // |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1706 | for (i = 0; i < lc_n_chunks-1; i++) { |
| 1707 | MC_Chunk* ch1 = lc_chunks[i]; |
| 1708 | MC_Chunk* ch2 = lc_chunks[i+1]; |
njn | b965efb | 2009-08-10 07:36:54 +0000 | [diff] [blame] | 1709 | |
| 1710 | Addr start1 = ch1->data; |
| 1711 | Addr start2 = ch2->data; |
| 1712 | Addr end1 = ch1->data + ch1->szB - 1; |
| 1713 | Addr end2 = ch2->data + ch2->szB - 1; |
| 1714 | Bool isCustom1 = ch1->allockind == MC_AllocCustom; |
| 1715 | Bool isCustom2 = ch2->allockind == MC_AllocCustom; |
| 1716 | |
| 1717 | if (end1 < start2) { |
| 1718 | // Normal case - no overlap. |
| 1719 | |
| 1720 | // We used to allow exact duplicates, I'm not sure why. --njn |
| 1721 | //} else if (start1 == start2 && end1 == end2) { |
| 1722 | // Degenerate case: exact duplicates. |
| 1723 | |
| 1724 | } else if (start1 >= start2 && end1 <= end2 && isCustom1 && !isCustom2) { |
| 1725 | // Block i is MALLOCLIKE and entirely within block i+1. |
| 1726 | // Remove block i+1. |
| 1727 | for (j = i+1; j < lc_n_chunks-1; j++) { |
| 1728 | lc_chunks[j] = lc_chunks[j+1]; |
| 1729 | } |
| 1730 | lc_n_chunks--; |
| 1731 | |
| 1732 | } else if (start2 >= start1 && end2 <= end1 && isCustom2 && !isCustom1) { |
| 1733 | // Block i+1 is MALLOCLIKE and entirely within block i. |
| 1734 | // Remove block i. |
| 1735 | for (j = i; j < lc_n_chunks-1; j++) { |
| 1736 | lc_chunks[j] = lc_chunks[j+1]; |
| 1737 | } |
| 1738 | lc_n_chunks--; |
| 1739 | |
| 1740 | } else { |
philippe | 09007e3 | 2012-03-01 22:00:36 +0000 | [diff] [blame] | 1741 | VG_(umsg)("Block 0x%lx..0x%lx overlaps with block 0x%lx..0x%lx\n", |
bart | 3c4fa9f | 2011-05-09 10:46:55 +0000 | [diff] [blame] | 1742 | start1, end1, start2, end2); |
philippe | 09007e3 | 2012-03-01 22:00:36 +0000 | [diff] [blame] | 1743 | VG_(umsg)("Blocks allocation contexts:\n"), |
philippe | 8617b5b | 2013-01-12 19:53:08 +0000 | [diff] [blame] | 1744 | VG_(pp_ExeContext)( MC_(allocated_at)(ch1)); |
philippe | 09007e3 | 2012-03-01 22:00:36 +0000 | [diff] [blame] | 1745 | VG_(umsg)("\n"), |
philippe | 8617b5b | 2013-01-12 19:53:08 +0000 | [diff] [blame] | 1746 | VG_(pp_ExeContext)( MC_(allocated_at)(ch2)); |
njn | b965efb | 2009-08-10 07:36:54 +0000 | [diff] [blame] | 1747 | VG_(umsg)("This is usually caused by using VALGRIND_MALLOCLIKE_BLOCK"); |
philippe | 09007e3 | 2012-03-01 22:00:36 +0000 | [diff] [blame] | 1748 | VG_(umsg)("in an inappropriate way.\n"); |
njn | b965efb | 2009-08-10 07:36:54 +0000 | [diff] [blame] | 1749 | tl_assert (0); |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1750 | } |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1751 | } |
| 1752 | |
| 1753 | // Initialise lc_extras. |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1754 | if (lc_extras) { |
| 1755 | VG_(free)(lc_extras); |
| 1756 | lc_extras = NULL; |
| 1757 | } |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1758 | lc_extras = VG_(malloc)( "mc.dml.2", lc_n_chunks * sizeof(LC_Extra) ); |
| 1759 | for (i = 0; i < lc_n_chunks; i++) { |
| 1760 | lc_extras[i].state = Unreached; |
tom | 1d0f3f6 | 2010-10-04 20:55:21 +0000 | [diff] [blame] | 1761 | lc_extras[i].pending = False; |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1762 | lc_extras[i].heuristic = LchNone; |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1763 | lc_extras[i].IorC.indirect_szB = 0; |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1764 | } |
| 1765 | |
| 1766 | // Initialise lc_markstack. |
| 1767 | lc_markstack = VG_(malloc)( "mc.dml.2", lc_n_chunks * sizeof(Int) ); |
| 1768 | for (i = 0; i < lc_n_chunks; i++) { |
| 1769 | lc_markstack[i] = -1; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1770 | } |
| 1771 | lc_markstack_top = -1; |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 1772 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1773 | // Verbosity. |
sewardj | 2d9e874 | 2009-08-07 15:46:56 +0000 | [diff] [blame] | 1774 | if (VG_(clo_verbosity) > 1 && !VG_(clo_xml)) { |
njn | b6267bd | 2009-08-12 00:14:16 +0000 | [diff] [blame] | 1775 | VG_(umsg)( "Searching for pointers to %'d not-freed blocks\n", |
sewardj | 6b523cd | 2009-07-15 14:49:40 +0000 | [diff] [blame] | 1776 | lc_n_chunks ); |
sewardj | 2d9e874 | 2009-08-07 15:46:56 +0000 | [diff] [blame] | 1777 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1778 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1779 | // Scan the memory root-set, pushing onto the mark stack any blocks |
| 1780 | // pointed to. |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1781 | scan_memory_root_set(/*searched*/0, 0); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1782 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1783 | // Scan GP registers for chunk pointers. |
| 1784 | VG_(apply_to_GP_regs)(lc_push_if_a_chunk_ptr_register); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1785 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1786 | // Process the pushed blocks. After this, every block that is reachable |
| 1787 | // from the root-set has been traced. |
| 1788 | lc_process_markstack(/*clique*/-1); |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 1789 | |
njn | b6267bd | 2009-08-12 00:14:16 +0000 | [diff] [blame] | 1790 | if (VG_(clo_verbosity) > 1 && !VG_(clo_xml)) { |
| 1791 | VG_(umsg)("Checked %'lu bytes\n", lc_scanned_szB); |
philippe | 7a76f4b | 2013-10-06 21:23:04 +0000 | [diff] [blame] | 1792 | if (lc_sig_skipped_szB > 0) |
| 1793 | VG_(umsg)("Skipped %'lu bytes due to read errors\n", |
| 1794 | lc_sig_skipped_szB); |
njn | b6267bd | 2009-08-12 00:14:16 +0000 | [diff] [blame] | 1795 | VG_(umsg)( "\n" ); |
| 1796 | } |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 1797 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1798 | // Trace all the leaked blocks to determine which are directly leaked and |
| 1799 | // which are indirectly leaked. For each Unreached block, push it onto |
| 1800 | // the mark stack, and find all the as-yet-Unreached blocks reachable |
| 1801 | // from it. These form a clique and are marked IndirectLeak, and their |
| 1802 | // size is added to the clique leader's indirect size. If one of the |
| 1803 | // found blocks was itself a clique leader (from a previous clique), then |
| 1804 | // the cliques are merged. |
| 1805 | for (i = 0; i < lc_n_chunks; i++) { |
| 1806 | MC_Chunk* ch = lc_chunks[i]; |
| 1807 | LC_Extra* ex = &(lc_extras[i]); |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 1808 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1809 | if (VG_DEBUG_CLIQUE) |
| 1810 | VG_(printf)("cliques: %d at %#lx -> Loss state %d\n", |
| 1811 | i, ch->data, ex->state); |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 1812 | |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1813 | tl_assert(lc_markstack_top == -1); |
| 1814 | |
| 1815 | if (ex->state == Unreached) { |
| 1816 | if (VG_DEBUG_CLIQUE) |
| 1817 | VG_(printf)("%d: gathering clique %#lx\n", i, ch->data); |
| 1818 | |
| 1819 | // Push this Unreached block onto the stack and process it. |
| 1820 | lc_push(i, ch); |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1821 | lc_process_markstack(/*clique*/i); |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1822 | |
| 1823 | tl_assert(lc_markstack_top == -1); |
| 1824 | tl_assert(ex->state == Unreached); |
nethercote | 0f19bce | 2003-12-02 10:17:44 +0000 | [diff] [blame] | 1825 | } |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 1826 | } |
njn | 8225cc0 | 2009-03-09 22:52:24 +0000 | [diff] [blame] | 1827 | |
sewardj | c8bd1df | 2011-06-26 12:41:33 +0000 | [diff] [blame] | 1828 | print_results( tid, lcp); |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 1829 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1830 | VG_(free) ( lc_markstack ); |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1831 | lc_markstack = NULL; |
| 1832 | // lc_chunks, lc_extras, lr_array and lr_table are kept (needed if user |
| 1833 | // calls MC_(print_block_list)). lr_table also used for delta leak reporting |
| 1834 | // between this leak search and the next leak search. |
| 1835 | } |
| 1836 | |
| 1837 | static Addr searched_wpa; |
| 1838 | static SizeT searched_szB; |
| 1839 | static void |
florian | 6bd9dc1 | 2012-11-23 16:17:43 +0000 | [diff] [blame] | 1840 | search_address_in_GP_reg(ThreadId tid, const HChar* regname, Addr addr_in_reg) |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1841 | { |
| 1842 | if (addr_in_reg >= searched_wpa |
| 1843 | && addr_in_reg < searched_wpa + searched_szB) { |
| 1844 | if (addr_in_reg == searched_wpa) |
| 1845 | VG_(umsg) |
| 1846 | ("tid %d register %s pointing at %#lx\n", |
| 1847 | tid, regname, searched_wpa); |
| 1848 | else |
| 1849 | VG_(umsg) |
| 1850 | ("tid %d register %s interior pointing %lu bytes inside %#lx\n", |
| 1851 | tid, regname, (long unsigned) addr_in_reg - searched_wpa, |
| 1852 | searched_wpa); |
| 1853 | } |
| 1854 | } |
| 1855 | |
| 1856 | void MC_(who_points_at) ( Addr address, SizeT szB) |
| 1857 | { |
| 1858 | MC_Chunk** chunks; |
| 1859 | Int n_chunks; |
| 1860 | Int i; |
| 1861 | |
| 1862 | if (szB == 1) |
| 1863 | VG_(umsg) ("Searching for pointers to %#lx\n", address); |
| 1864 | else |
| 1865 | VG_(umsg) ("Searching for pointers pointing in %lu bytes from %#lx\n", |
| 1866 | szB, address); |
| 1867 | |
philippe | ab1fce9 | 2013-09-29 13:47:32 +0000 | [diff] [blame] | 1868 | chunks = find_active_chunks(&n_chunks); |
| 1869 | |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1870 | // Scan memory root-set, searching for ptr pointing in address[szB] |
| 1871 | scan_memory_root_set(address, szB); |
| 1872 | |
| 1873 | // Scan active malloc-ed chunks |
philippe | a22f59d | 2012-01-26 23:13:52 +0000 | [diff] [blame] | 1874 | for (i = 0; i < n_chunks; i++) { |
| 1875 | lc_scan_memory(chunks[i]->data, chunks[i]->szB, |
| 1876 | /*is_prior_definite*/True, |
| 1877 | /*clique*/-1, /*cur_clique*/-1, |
| 1878 | address, szB); |
| 1879 | } |
| 1880 | VG_(free) ( chunks ); |
| 1881 | |
| 1882 | // Scan GP registers for pointers to address range. |
| 1883 | searched_wpa = address; |
| 1884 | searched_szB = szB; |
| 1885 | VG_(apply_to_GP_regs)(search_address_in_GP_reg); |
| 1886 | |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 1887 | } |
| 1888 | |
| 1889 | /*--------------------------------------------------------------------*/ |
njn | 1d0825f | 2006-03-27 11:37:07 +0000 | [diff] [blame] | 1890 | /*--- end ---*/ |
njn | 43c799e | 2003-04-08 00:08:52 +0000 | [diff] [blame] | 1891 | /*--------------------------------------------------------------------*/ |
| 1892 | |