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Re-port to 32-bit systems without alignment primitives

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* configure.ac (ALIGNOF_INT, ALIGNOF_LONG, ALIGNOF_LONG_LONG):
New variables.
(emacs_cv_alignas_unavailable): Define if alignas and structure
alignment primitives are unavailable.  In such an environment,
the MSB tagging scheme must be enabled, as must the GNU malloc.

* msdos/sed2v2.inp: Adjust correspondingly.

* src/alloc.c (union emacs_align_type): Remove types which
contain flexible array members.  The address of a field
subsequent to an aggregate with flexible array members cannot
validly be taken.
(mark_memory) [!USE_LSB_TAG && !WIDE_EMACS_INT]: Strip type bits
before scanning memory.

* src/emacs.c (main):

* src/eval.c (Fautoload_do_load):

* src/fns.c (Frequire): Rename a number of illogically named
fields.

* src/lisp.h (ALIGNOF_EMACS_INT): Define to the natural
alignment of EMACS_INT.
(IDEAL_GCALIGNMENT): New macro.
(USE_LSB_TAG): Disable if no alignment specifiers are available,
WIDE_EMACS_INT is undefined, and the natural alignment of
EMACS_INT falls short of LSB tagging's requirements.
(gflags): Rename illogically named fields and don't define them
as bitfields, which runs afoul of certain compiler issues.
(will_dump_p, will_bootstrap_p, will_dump_with_pdumper_p)
(dumped_with_pdumper_p): Adjust accordingly.

* src/pdumper.c (VM_SUPPORTED): Define to 0 when !USE_LSB_TAG.
It is better to read dump files into the heap by hand than to be
supplied with an address that is not representable.
(_dump_object_start_pseudovector): Rename to
dump_object_start_pseudovector, to avoid encroaching on reserved
names.
(START_DUMP_PVEC): Adjust correspondingly.
(dump_mmap_contiguous_vm): Preserve errno around failure
cleanup.
(dump_bitset_bit_set_p): Work around certain compiler issues.
(pdumper_load) [!USE_LSB_TAG]: Reject dump file allocations
that are not representable as Lisp_Objects.

Tested on i386-unknown-solaris2.10, sparc-sun-solaris2.10.
This commit is contained in:
Po Lu
2025-03-09 23:02:21 +08:00
parent 57cef07710
commit a5f8ce9f1e
8 changed files with 193 additions and 100 deletions
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3
msdos/sed2v2.inp
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@@ -140,6 +140,9 @@ s/^#undef HAVE_DECL_STRTOIMAX *$/#define HAVE_DECL_STRTOIMAX 1/
s/^#undef HAVE_PDUMPER *$/#define HAVE_PDUMPER 1/
s/^#undef HAVE_STRTOLL *$/#define HAVE_STRTOLL 1/
s/^#undef HAVE_STRTOULL *$/#define HAVE_STRTOULL 1/
s/^#undef ALIGNOF_INT *$/s/^.*$/#define ALIGNOF_INT 4/
s/^#undef ALIGNOF_LONG *$/s/^.*$/#define ALIGNOF_LONG 4/
s/^#undef ALIGNOF_LONG_LONG *$/s/^.*$/#define ALIGNOF_LONG_LONG 4/
/^#undef HAVE_STRUCT_DIRENT_D_TYPE *$/c\
#if __DJGPP__ + (__DJGPP_MINOR__ >= 5) >= 3\
#define HAVE_STRUCT_DIRENT_D_TYPE 1/\