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Tcache flush: Unify edata lookup path.

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David Goldblatt 2021-01-27 15:36:11 -08:00 committed by David Goldblatt
parent 35a8552605
commit c007c537ff
1 changed files with 7 additions and 18 deletions
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25
src/tcache.c
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@ -236,18 +236,16 @@ tcache_alloc_small_hard(tsdn_t *tsdn, arena_t *arena,
return ret;
}
/* Enabled with --enable-extra-size-check. */
static void
tbin_edatas_lookup_size_check(tsd_t *tsd, cache_bin_ptr_array_t *arr,
tcache_bin_flush_edatas_lookup(tsd_t *tsd, cache_bin_ptr_array_t *arr,
szind_t binind, size_t nflush, edata_t **edatas) {
/* Avoids null-checking tsdn in the loop below. */
util_assume(tsd != NULL);
/*
* Verify that the items in the tcache all have the correct size; this
* is useful for catching sized deallocation bugs, also to fail early
* instead of corrupting metadata. Since this can be turned on for opt
* builds, avoid the branch in the loop.
* This gets compiled away when config_opt_safety_checks is false.
* Checks for sized deallocation bugs, failing early rather than
* corrupting metadata.
*/
size_t szind_sum = binind * nflush;
for (unsigned i = 0; i < nflush; i++) {
@ -258,9 +256,10 @@ tbin_edatas_lookup_size_check(tsd_t *tsd, cache_bin_ptr_array_t *arr,
szind_sum -= full_alloc_ctx.szind;
}
if (szind_sum != 0) {
if (config_opt_safety_checks && szind_sum != 0) {
safety_check_fail_sized_dealloc(false);
}
}
JEMALLOC_ALWAYS_INLINE bool
@ -306,17 +305,7 @@ tcache_bin_flush_impl(tsd_t *tsd, tcache_t *tcache, cache_bin_t *cache_bin,
cache_bin_init_ptr_array_for_flush(cache_bin, &tcache_bin_info[binind],
&ptrs, nflush);
/* Look up edata once per item. */
if (config_opt_safety_checks) {
tbin_edatas_lookup_size_check(tsd, &ptrs, binind, nflush,
item_edata);
} else {
for (unsigned i = 0 ; i < nflush; i++) {
item_edata[i] = emap_edata_lookup(tsd_tsdn(tsd),
&arena_emap_global,
cache_bin_ptr_array_get(&ptrs, i));
}
}
tcache_bin_flush_edatas_lookup(tsd, &ptrs, binind, nflush, item_edata);
/*
* The slabs where we freed the last remaining object in the slab (and