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Fix all optimization-inhibiting integer-to-pointer casts

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Following from PR #2481, we replace all integer-to-pointer casts [which
hide pointer provenance information (and thus inhibit
optimizations)](https://clang.llvm.org/extra/clang-tidy/checks/performance/no-int-to-ptr.html)
with equivalent operations that preserve this information. I have
enabled the corresponding clang-tidy check in our static analysis CI so
that we do not get bitten by this again in the future.
This commit is contained in:
Kevin Svetlitski 2023-07-24 10:33:36 -07:00 • committed by Qi Wang
parent 4827bb17bd
commit 3e82f357bb
27 changed files with 116 additions and 66 deletions
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4
include/jemalloc/internal/cache_bin.h
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@ -247,7 +247,7 @@ static inline void **
cache_bin_empty_position_get(cache_bin_t *bin) {
cache_bin_sz_t diff = cache_bin_diff(bin,
(uint16_t)(uintptr_t)bin->stack_head, bin->low_bits_empty);
uintptr_t empty_bits = (uintptr_t)bin->stack_head + diff;
byte_t *empty_bits = (byte_t *)bin->stack_head + diff;
void **ret = (void **)empty_bits;
assert(ret >= bin->stack_head);
@ -479,7 +479,7 @@ cache_bin_stash(cache_bin_t *bin, void *ptr) {
uint16_t low_bits_head = (uint16_t)(uintptr_t)bin->stack_head;
/* Wraparound handled as well. */
uint16_t diff = cache_bin_diff(bin, bin->low_bits_full, low_bits_head);
*(void **)((uintptr_t)bin->stack_head - diff) = ptr;
*(void **)((byte_t *)bin->stack_head - diff) = ptr;
assert(!cache_bin_full(bin));
bin->low_bits_full += sizeof(void *);