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Replace experimental_infallible_new with compile-time flag

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The runtime option aborted on every OOM, breaking new(std::nothrow)
semantics. Replace with configure-time --enable-cxx-infallible-new
(default off): when on, throwing new aborts (size logged) and
nothrow returns null; when off, standard new_handler + bad_alloc /
null behavior is preserved. Under LTO the on-path lets the compiler
prove operator new is no-throw.
This commit is contained in:
Slobodan Predolac
2026-06-04 10:58:43 -07:00
parent a6048680a8
commit 160ab9d7f6
19 changed files with 103 additions and 44 deletions
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7
include/jemalloc/internal/jemalloc_internal_defs.h.in
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@@ -468,6 +468,13 @@
/* Are C++ exceptions enabled? */
#undef JEMALLOC_HAVE_CXX_EXCEPTIONS
/*
* If defined, throwing operator new aborts on OOM (with size logged) instead
* of throwing std::bad_alloc. Nothrow new still returns null. With LTO this
* lets the compiler prove operator new is no-throw and elide exception cleanup.
*/
#undef JEMALLOC_INFALLIBLE_NEW
/* Performs additional size checks when defined. */
#undef JEMALLOC_OPT_SIZE_CHECKS

1
include/jemalloc/internal/jemalloc_internal_externs.h
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@@ -30,7 +30,6 @@ extern void (*JET_MUTABLE junk_alloc_callback)(void *ptr, size_t size);
extern void (*JET_MUTABLE invalid_conf_abort)(void);
extern bool opt_utrace;
extern bool opt_xmalloc;
extern bool opt_experimental_infallible_new;
extern bool opt_experimental_tcache_gc;
extern bool opt_zero;
extern unsigned opt_narenas;

12
include/jemalloc/internal/jemalloc_preamble.h.in
View File

@@ -238,6 +238,18 @@ static const bool config_enable_cxx =
#endif
;
/*
* Whether the throwing operator new aborts on OOM instead of throwing
* std::bad_alloc (--enable-cxx-infallible-new).
*/
static const bool config_infallible_new =
#ifdef JEMALLOC_INFALLIBLE_NEW
true
#else
false
#endif
;
#if defined(_WIN32) || defined(__APPLE__) || defined(JEMALLOC_HAVE_SCHED_GETCPU)
/* Currently percpu_arena depends on sched_getcpu. */
#define JEMALLOC_PERCPU_ARENA