* libguile/boolean.c (scm_nil_p): Improve docstring.
* doc/ref/api-languages.texi (Nil): Add documentation for 'nil?', along
with a description of how Elisp interprets Scheme booleans and
end-of-list.
* acinclude.m4: Disable JIT by default on not-x86-64. Although I got
JIT mostly working on 32-bit x86, I got nondeterministic segfaults
deep in lightning, on that platform; perhaps indicating a bug in the
optimizer. After a day of poking and not solving the problem, I think
that I don't want the complexity of Lightning's node representation,
especially on platforms that get less testing. In the future we'll
use the lightning backends without the node layer.
* NEWS: Update.
* libguile/jit.c (compile_u64_imm_less): Compare high word using
not-equal, to avoid a signedness compare.
(compile_s64_imm_less, compile_imm_s64_less): Fix the not-less cases.
* libguile/jit.c (record_gpr_clobber): If we clobber SP or FP, clear the
appropriate register state bits. Only exercised for 32-bit targets in
practice!
(emit_alloc_frame, emit_push_frame): Fix a couple places where we were
failing to track the register state correctly.
(compile_umul): Remove a needless register state flush, nowthat
qmulr_u has a wrapper that tracks this for us.
* module/system/vm/linker.scm (<linker-object>): Add name field. This
allows the linker to find sections by name, notably before having
found the .shstrtab section. As there can be multiple sections with
type SHT_STRTAB, this fixes a bug whereby we could use a section
name (a strtab index) into an unrelated strtab. In the past this
worked because with ASCII identifiers there won't be an exception,
although it is possible to accidentally mistake a shared string tail;
but with UTF-8 identifiers, it's possible for a string table index to
point in the middle of a codepoint, which is likely not valid UTF-8
and would raise a bug. Keeping an additional section name field fixes
this bug. Adapt all callers to pass a name argument to
make-linker-object.
(find-shstrndx): Update to look at the name field.
* module/system/vm/assembler.scm (make-object): Pass name to
make-linker-object.
Thanks to Daniel Llorens for the test case.
* libguile/srfi-14.c (scm_sys_char_set_dump): Silence an erroneous
-Wformat-overflow warning based on an incorrect range inference by
increasing output buffer size.
* doc/ref/api-debug.texi (VM Hooks): Update for changes in VM hook API.
* doc/ref/guile.texi: Update copyright years.
* doc/ref/preface.texi (Contributors): Update.
Fixes <https://bugs.gnu.org/32786>.
'scm_atomic_compare_and_swap_scm' is a thin wrapper around
'atomic_compare_exchange_weak' (where available), and therefore it may
spuriously fail on some platforms, leaving the atomic object unchanged
even when the observed value is equal to the expected value. Since
'scm_atomic_compare_and_swap_scm' returns both a boolean result and the
observed value, the caller is able to detect spurious failures when
using that API.
'atomic-box-compare-and-swap!' presents a simpler API, returning only
the observed value. The documentation advises callers to assume that
the exchange succeeded if the observed value is 'eq?' to the expected
value. It's therefore not possible to report spurious failures with
this API.
'atomic-box-compare-and-swap!' uses 'scm_atomic_compare_and_swap_scm',
and prior to this commit would simply ignore the boolean result and
return the observed value. In case of spurious failures, the caller
would legitimately conclude that the exchange had succeeded.
With this commit, 'atomic-box-compare-and-swap!' now retries in case of
spurious failures.
* libguile/atomic.c (scm_atomic_box_compare_and_swap_x): If
'scm_atomic_compare_and_swap_scm' returns false and the observed value
is equal to 'expected', then try again.
* libguile/vm-engine.c (atomic-box-compare-and-swap!): Ditto.
* doc/ref/compiler.texi (Bytecode): Update macro-assembler instructions,
and move most of them to the instruction set reference.
* doc/ref/vm.texi (A Virtual Machine for Guile, VM Programs): Minor
fixes.
(Instruction Set): Update for Guile 3 instruction set.
* libguile/vm-engine.c (vm_engine): Update a few instruction
docstrings.
* doc/ref/data-rep.texi (The SCM Type in Guile): Refer to scm.h.
(Relationship Between SCM and scm_t_bits): Better title-case.
(Immediate Objects): Better title-case. Prefer "heap object" over
"cell".
(Non-Immediate Objects): Better title-case. Deprecate the concept of
cells.
(Allocating Heap Objects): Rename from Allocating Cells.
(Heap Object Type Information): Rename from Heap Cell Type Information.
(Accessing Heap Object Fields): Rename from Accessing Cell Entries.
* doc/ref/vm.texi: Update references.
* libguile/jit.c (compile_s64_numerically_equal): Remove as this
instruction was removed in previous refactoring.
(compile_atomic_scm_set_immediate), compile_atomic_scm_ref_immediate):
Adapt to change in C name of these instructions.
* libguile/vm-engine.c: Add comments for all instructions.
* libguile/vm-engine.c (abort): If the abort doesn't need to longjmp and
the abort hook was enabled, cache registers first to avoid restoring
a bad IP to the VM.
* libguile/loader.h (SCM_OBJCODE_MINIMUM_MINOR_VERSION):
(SCM_OBJCODE_MINOR_VERSION): Bump version.
* module/system/vm/assembler.scm (*bytecode-minor-version*): Bump.
* libguile/vm-engine.c: Rearrange opcodes to be contiguous and in a
somewhat sensible order.
* libguile/jit.c: Wrap the whole thing in ENABLE_JIT.
* libguile/threads.c (on_thread_exit):
* libguile/vm.c (scm_call_n):
* libguile/init.c (scm_i_init_guile):
* libguile/vm-engine.c (VM_NAME): Wrap calls into jit.c with ENABLE_JIT.
* configure.ac: Move up AC_CANONICAL_TARGET, as autoconf was complaining
about it coming after AC_ARG_PROGRAM.
* acinclude.m4 (GUILE_ENABLE_JIT): Fix to honor --enable-jit arg.
* libguile/vm.c (scm_i_vm_emergency_abort): New helper: an abort that
doesn't allocate, not even stack.
* libguile/throw.c (abort_to_prompt): Use scm_i_vm_emergency_abort.
* libguile/vm.h: Declare helper.
