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Define PROF_TCTX_SENTINEL instead of using magic numbers

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This makes the code more readable on its own, and also sets the stage
for more cleanly handling the pointer provenance lints in a following
commit.
This commit is contained in:
Kevin Svetlitski 2023-07-21 18:13:58 -07:00 committed by Qi Wang
parent c49c17f128
commit 7e54dd1ddb
7 changed files with 39 additions and 24 deletions
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6
include/jemalloc/internal/arena_inlines_b.h
View File

@ -104,15 +104,15 @@ arena_prof_info_get(tsd_t *tsd, const void *ptr, emap_alloc_ctx_t *alloc_ctx,
if (reset_recent &&
large_dalloc_safety_checks(edata, ptr,
edata_szind_get(edata))) {
prof_info->alloc_tctx = (prof_tctx_t *)(uintptr_t)1U;
prof_info->alloc_tctx = PROF_TCTX_SENTINEL;
return;
}
large_prof_info_get(tsd, edata, prof_info, reset_recent);
} else {
prof_info->alloc_tctx = (prof_tctx_t *)(uintptr_t)1U;
prof_info->alloc_tctx = PROF_TCTX_SENTINEL;
/*
* No need to set other fields in prof_info; they will never be
* accessed if (uintptr_t)alloc_tctx == (uintptr_t)1U.
* accessed if alloc_tctx == PROF_TCTX_SENTINEL.
*/
}
}

25
include/jemalloc/internal/prof_inlines.h
View File

@ -106,6 +106,11 @@ prof_info_get_and_reset_recent(tsd_t *tsd, const void *ptr,
arena_prof_info_get(tsd, ptr, alloc_ctx, prof_info, true);
}
JEMALLOC_ALWAYS_INLINE bool
prof_tctx_is_valid(const prof_tctx_t *tctx) {
return tctx != NULL && tctx != PROF_TCTX_SENTINEL;
}
JEMALLOC_ALWAYS_INLINE void
prof_tctx_reset(tsd_t *tsd, const void *ptr, emap_alloc_ctx_t *alloc_ctx) {
cassert(config_prof);
@ -126,7 +131,7 @@ JEMALLOC_ALWAYS_INLINE void
prof_info_set(tsd_t *tsd, edata_t *edata, prof_tctx_t *tctx, size_t size) {
cassert(config_prof);
assert(edata != NULL);
assert((uintptr_t)tctx > (uintptr_t)1U);
assert(prof_tctx_is_valid(tctx));
arena_prof_info_set(tsd, edata, tctx, size);
}
@ -161,7 +166,7 @@ prof_alloc_prep(tsd_t *tsd, bool prof_active, bool sample_event) {
if (!prof_active ||
likely(prof_sample_should_skip(tsd, sample_event))) {
ret = (prof_tctx_t *)(uintptr_t)1U;
ret = PROF_TCTX_SENTINEL;
} else {
ret = prof_tctx_create(tsd);
}
@ -176,7 +181,7 @@ prof_malloc(tsd_t *tsd, const void *ptr, size_t size, size_t usize,
assert(ptr != NULL);
assert(usize == isalloc(tsd_tsdn(tsd), ptr));
if (unlikely((uintptr_t)tctx > (uintptr_t)1U)) {
if (unlikely(prof_tctx_is_valid(tctx))) {
prof_malloc_sample_object(tsd, ptr, size, usize, tctx);
} else {
prof_tctx_reset(tsd, ptr, alloc_ctx);
@ -190,7 +195,7 @@ prof_realloc(tsd_t *tsd, const void *ptr, size_t size, size_t usize,
bool sampled, old_sampled, moved;
cassert(config_prof);
assert(ptr != NULL || (uintptr_t)tctx <= (uintptr_t)1U);
assert(ptr != NULL || !prof_tctx_is_valid(tctx));
if (prof_active && ptr != NULL) {
assert(usize == isalloc(tsd_tsdn(tsd), ptr));
@ -203,12 +208,12 @@ prof_realloc(tsd_t *tsd, const void *ptr, size_t size, size_t usize,
* sample threshold.
*/
prof_alloc_rollback(tsd, tctx);
tctx = (prof_tctx_t *)(uintptr_t)1U;
tctx = PROF_TCTX_SENTINEL;
}
}
sampled = ((uintptr_t)tctx > (uintptr_t)1U);
old_sampled = ((uintptr_t)old_prof_info->alloc_tctx > (uintptr_t)1U);
sampled = prof_tctx_is_valid(tctx);
old_sampled = prof_tctx_is_valid(old_prof_info->alloc_tctx);
moved = (ptr != old_ptr);
if (unlikely(sampled)) {
@ -226,7 +231,7 @@ prof_realloc(tsd_t *tsd, const void *ptr, size_t size, size_t usize,
} else {
prof_info_t prof_info;
prof_info_get(tsd, ptr, NULL, &prof_info);
assert((uintptr_t)prof_info.alloc_tctx == (uintptr_t)1U);
assert(prof_info.alloc_tctx == PROF_TCTX_SENTINEL);
}
/*
@ -258,7 +263,7 @@ JEMALLOC_ALWAYS_INLINE bool
prof_sampled(tsd_t *tsd, const void *ptr) {
prof_info_t prof_info;
prof_info_get(tsd, ptr, NULL, &prof_info);
bool sampled = (uintptr_t)prof_info.alloc_tctx > (uintptr_t)1U;
bool sampled = prof_tctx_is_valid(prof_info.alloc_tctx);
if (sampled) {
assert(prof_sample_aligned(ptr));
}
@ -274,7 +279,7 @@ prof_free(tsd_t *tsd, const void *ptr, size_t usize,
cassert(config_prof);
assert(usize == isalloc(tsd_tsdn(tsd), ptr));
if (unlikely((uintptr_t)prof_info.alloc_tctx > (uintptr_t)1U)) {
if (unlikely(prof_tctx_is_valid(prof_info.alloc_tctx))) {
assert(prof_sample_aligned(ptr));
prof_free_sampled_object(tsd, ptr, usize, &prof_info);
}

2
include/jemalloc/internal/prof_types.h
View File

@ -88,4 +88,6 @@ typedef struct prof_recent_s prof_recent_t;
#define PROF_SAMPLE_ALIGNMENT PAGE
#define PROF_SAMPLE_ALIGNMENT_MASK PAGE_MASK
#define PROF_TCTX_SENTINEL ((prof_tctx_t *)((uintptr_t)1U))
#endif /* JEMALLOC_INTERNAL_PROF_TYPES_H */

8
src/jemalloc.c
View File

@ -2529,12 +2529,12 @@ imalloc_body(static_opts_t *sopts, dynamic_opts_t *dopts, tsd_t *tsd) {
sample_event);
emap_alloc_ctx_t alloc_ctx;
if (likely((uintptr_t)tctx == (uintptr_t)1U)) {
if (likely(tctx == PROF_TCTX_SENTINEL)) {
alloc_ctx.slab = sz_can_use_slab(usize);
allocation = imalloc_no_sample(
sopts, dopts, tsd, usize, usize, ind,
alloc_ctx.slab);
} else if ((uintptr_t)tctx > (uintptr_t)1U) {
} else if (tctx != NULL) {
allocation = imalloc_sample(
sopts, dopts, tsd, usize, ind);
alloc_ctx.slab = false;
@ -3366,7 +3366,7 @@ irallocx_prof(tsd_t *tsd, void *old_ptr, size_t old_usize, size_t size,
bool sample_event = te_prof_sample_event_lookahead(tsd, usize);
prof_tctx_t *tctx = prof_alloc_prep(tsd, prof_active, sample_event);
void *p;
if (unlikely((uintptr_t)tctx != (uintptr_t)1U)) {
if (unlikely(tctx != PROF_TCTX_SENTINEL)) {
p = irallocx_prof_sample(tsd_tsdn(tsd), old_ptr, old_usize,
usize, alignment, zero, tcache, arena, tctx, hook_args);
} else {
@ -3612,7 +3612,7 @@ ixallocx_prof(tsd_t *tsd, void *ptr, size_t old_usize, size_t size,
prof_tctx_t *tctx = prof_alloc_prep(tsd, prof_active, sample_event);
size_t usize;
if (unlikely((uintptr_t)tctx != (uintptr_t)1U)) {
if (unlikely(tctx != PROF_TCTX_SENTINEL)) {
usize = ixallocx_prof_sample(tsd_tsdn(tsd), ptr, old_usize,
size, extra, alignment, zero, tctx);
} else {

4
src/large.c
View File

@ -287,7 +287,7 @@ large_prof_info_get(tsd_t *tsd, edata_t *edata, prof_info_t *prof_info,
prof_tctx_t *alloc_tctx = edata_prof_tctx_get(edata);
prof_info->alloc_tctx = alloc_tctx;
if ((uintptr_t)alloc_tctx > (uintptr_t)1U) {
if (prof_tctx_is_valid(alloc_tctx)) {
nstime_copy(&prof_info->alloc_time,
edata_prof_alloc_time_get(edata));
prof_info->alloc_size = edata_prof_alloc_size_get(edata);
@ -308,7 +308,7 @@ large_prof_tctx_set(edata_t *edata, prof_tctx_t *tctx) {
void
large_prof_tctx_reset(edata_t *edata) {
large_prof_tctx_set(edata, (prof_tctx_t *)(uintptr_t)1U);
large_prof_tctx_set(edata, PROF_TCTX_SENTINEL);
}
void

14
src/prof.c
View File

@ -91,11 +91,19 @@ prof_alloc_rollback(tsd_t *tsd, prof_tctx_t *tctx) {
cassert(config_prof);
if (tsd_reentrancy_level_get(tsd) > 0) {
assert((uintptr_t)tctx == (uintptr_t)1U);
assert(tctx == PROF_TCTX_SENTINEL);
return;
}
if ((uintptr_t)tctx > (uintptr_t)1U) {
if (prof_tctx_is_valid(tctx)) {
/*
* This `assert` really shouldn't be necessary. It's here
* because there's a bug in the clang static analyzer; it
* somehow does not realize that by `prof_tctx_is_valid(tctx)`
* being true that we've already ensured that `tctx` is not
* `NULL`.
*/
assert(tctx != NULL);
malloc_mutex_lock(tsd_tsdn(tsd), tctx->tdata->lock);
tctx->prepared = false;
prof_tctx_try_destroy(tsd, tctx);
@ -169,7 +177,7 @@ prof_free_sampled_object(tsd_t *tsd, const void *ptr, size_t usize,
assert(prof_info != NULL);
prof_tctx_t *tctx = prof_info->alloc_tctx;
assert((uintptr_t)tctx > (uintptr_t)1U);
assert(prof_tctx_is_valid(tctx));
szind_t szind = sz_size2index(usize);

4
test/unit/prof_tctx.c
View File

@ -18,7 +18,7 @@ TEST_BEGIN(test_prof_realloc) {
p = mallocx(1024, flags);
expect_ptr_not_null(p, "Unexpected mallocx() failure");
prof_info_get(tsd, p, NULL, &prof_info_p);
expect_ptr_ne(prof_info_p.alloc_tctx, (prof_tctx_t *)(uintptr_t)1U,
expect_ptr_ne(prof_info_p.alloc_tctx, PROF_TCTX_SENTINEL,
"Expected valid tctx");
prof_cnt_all(&cnt_1);
expect_u64_eq(cnt_0.curobjs + 1, cnt_1.curobjs,
@ -28,7 +28,7 @@ TEST_BEGIN(test_prof_realloc) {
expect_ptr_ne(p, q, "Expected move");
expect_ptr_not_null(p, "Unexpected rmallocx() failure");
prof_info_get(tsd, q, NULL, &prof_info_q);
expect_ptr_ne(prof_info_q.alloc_tctx, (prof_tctx_t *)(uintptr_t)1U,
expect_ptr_ne(prof_info_q.alloc_tctx, PROF_TCTX_SENTINEL,
"Expected valid tctx");
prof_cnt_all(&cnt_2);
expect_u64_eq(cnt_1.curobjs, cnt_2.curobjs,