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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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23
configure.ac
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@@ -396,8 +396,31 @@ if test "x$enable_cxx" = "x1"; then
enable_cxx_exceptions="0"
fi
fi
dnl Do not enable infallible-new by default. When enabled, the throwing
dnl operator new aborts on OOM (with size logged) instead of throwing
dnl std::bad_alloc; nothrow new still returns null. With LTO this lets the
dnl compiler prove operator new doesn't throw and elide exception cleanup.
AC_ARG_ENABLE([cxx-infallible-new],
[AS_HELP_STRING([--enable-cxx-infallible-new],
[Abort on OOM in throwing operator new instead of throwing std::bad_alloc])],
[if test "x$enable_cxx_infallible_new" = "xno" ; then
enable_cxx_infallible_new="0"
else
enable_cxx_infallible_new="1"
fi
],
[enable_cxx_infallible_new="0"]
)
if test "x$enable_cxx" != "x1" ; then
enable_cxx_infallible_new="0"
fi
if test "x$enable_cxx_infallible_new" = "x1" ; then
AC_DEFINE([JEMALLOC_INFALLIBLE_NEW], [ ], [ ])
fi
AC_SUBST([enable_cxx])
AC_SUBST([enable_cxx_exceptions])
AC_SUBST([enable_cxx_infallible_new])
AC_SUBST([CONFIGURE_CXXFLAGS])
AC_SUBST([SPECIFIED_CXXFLAGS])
AC_SUBST([EXTRA_CXXFLAGS])