Remove structure magic, because 1) it is no longer conditional, and 2)
it stopped being very effective at detecting memory corruption several
years ago.
Convert configuration-related cpp conditional logic to use static
constant variables, e.g.:
#ifdef JEMALLOC_DEBUG
[...]
#endif
becomes:
if (config_debug) {
[...]
}
The advantage is clearer, more concise code. The main disadvantage is
that data structures no longer have conditionally defined fields, so
they pay the cost of all fields regardless of whether they are used. In
practice, this is only a minor concern; config_stats will go away in an
upcoming change, and config_prof is the only other major feature that
depends on more than a few special-purpose fields.
Fix the logic in stats_print() such that if the "a" flag is passed in
without the "m" flag, merged statistics will be printed even if only one
arena is initialized.
Fix huge_ralloc() to remove the old memory region from tree of huge
allocations *before* calling mremap(2), in order to make sure that no
other thread acquires the old memory region via mmap() and encounters
stale metadata in the tree.
Reported by: Rich Prohaska
Fix the logic in stats_print() such that if the "a" flag is passed in
without the "m" flag, merged statistics will be printed even if only one
arena is initialized.
Fix huge_ralloc() to remove the old memory region from tree of huge
allocations *before* calling mremap(2), in order to make sure that no
other thread acquires the old memory region via mmap() and encounters
stale metadata in the tree.
Reported by: Rich Prohaska
Refactor the SO and REV such that they are set via autoconf variables,
@so@ and @rev@. These variables are both needed by the jemalloc.sh
script, so this unifies their definitions.
Fix prof_lookup() to artificially raise curobjs for all paths through
the code that creates a new entry in the per thread bt2cnt hash table.
This fixes a race condition that could corrupt memory if prof_accum were
false, and a non-default lg_prof_tcmax were used and/or threads were
destroyed.
Add a missing prof_malloc() call in allocm(). Before this fix, negative
object/byte counts could be observed in heap profiles for applications
that use allocm().
Rewrite prof_alloc_prep() as a cpp macro, PROF_ALLOC_PREP(), in order to
remove any doubt as to whether an additional stack frame is created.
Prior to this change, it was assumed that inlining would reduce the
total number of frames in the backtrace, but in practice behavior wasn't
completely predictable.
Create imemalign() and call it from posix_memalign(), memalign(), and
valloc(), so that all entry points require the same number of stack
frames to be ignored during backtracing.
Properly handle boundary conditions for sampled region promotion in
rallocm(). Prior to this fix, some combinations of 'size' and 'extra'
values could cause erroneous behavior. Additionally, size class
recording for promoted regions was incorrect.
Fix assertions in arena_purge() to accurately reflect the constraints in
arena_maybe_purge(). There were two bugs here, one of which merely
weakened the assertion, and the other of which referred to an
uninitialized variable (typo; used npurgatory instead of
arena->npurgatory).
Add inline assembly implementations of atomic_{add,sub}_uint{32,64}()
for x86/x64, in order to support compilers that are missing the relevant
gcc intrinsics.
sa2u() returns 0 on overflow, but the profiling code was blindly calling
sa2u() and allowing the error to silently propagate, ultimately ending
in a later assertion failure. Refactor all ipalloc() callers to call
sa2u(), check for overflow before calling ipalloc(), and pass usize
rather than size. This allows ipalloc() to avoid calling sa2u() in the
common case.
