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GNU Guile 2.9.3 Released [beta]
GNU Guile 2.9.3 Released [beta]
Sat, 03 Aug 2019 13:21:06 +0200
Gnus/5.13 (Gnus v5.13) Emacs/26.2 (gnu/linux)
We are pleased to announce GNU Guile release 2.9.3. This is the third
pre-release of what will eventually become the 3.0 release series.
Compared to the current stable series (2.2.x), the future Guile 3.0 adds
support for just-in-time native code generation, speeding up all Guile
programs. See the NEWS extract at the end of the mail for full details.
Compared to the previous prerelease (2.9.2), Guile 2.9.3 improves the
quality of generated machine code, speeding up some programs by up to
We encourage you to test this release and provide feedback to
address@hidden, and to file bugs by sending mail to
The Guile web page is located at http://gnu.org/software/guile/, and
among other things, it contains a copy of the Guile manual and pointers
to more resources.
Guile is an implementation of the Scheme programming language, with
support for many SRFIs, packaged for use in a wide variety of
environments. In addition to implementing the R5RS Scheme standard,
Guile includes a module system, full access to POSIX system calls,
networking support, multiple threads, dynamic linking, a foreign
function call interface, and powerful string processing.
Guile can run interactively, as a script interpreter, and as a Scheme
compiler to VM bytecode. It is also packaged as a library so that
applications can easily incorporate a complete Scheme interpreter/VM.
An application can use Guile as an extension language, a clean and
powerful configuration language, or as multi-purpose "glue" to connect
primitives provided by the application. It is easy to call Scheme code
>From C code and vice versa. Applications can add new functions, data
types, control structures, and even syntax to Guile, to create a
domain-specific language tailored to the task at hand.
Guile 2.9.3 can be installed in parallel with Guile 2.2.x; see
A more detailed NEWS summary follows these details on how to get the
Here are the compressed sources:
Here are the GPG detached signatures[*]:
Use a mirror for higher download bandwidth:
Here are the SHA256 checksums:
[*] Use a .sig file to verify that the corresponding file (without the
.sig suffix) is intact. First, be sure to download both the .sig file
and the corresponding tarball. Then, run a command like this:
gpg --verify guile-2.9.3.tar.gz.sig
If that command fails because you don't have the required public key,
then run this command to import it:
gpg --keyserver keys.gnupg.net --recv-keys
and rerun the 'gpg --verify' command.
This release was bootstrapped with the following tools:
Changes in alpha 2.9.3 (since alpha 2.9.2):
* Notable changes
** Improved just-in-time machine code generation
Guile's JIT compiler emits better code for indirect procedure calls,
atomic instructions, numeric comparisons, procedure prologues,
well-known closures with no free variables, calls and returns, and
allocations. Together these improvements can speed up some benchmarks
by up to 50%.
Cumulative changes in the alpha 2.9.x series (since the stable 2.2 series):
* Notable changes
** Just-in-time code generation
Guile programs now run up to 4 times faster, relative to Guile 2.2,
thanks to just-in-time (JIT) native code generation. Notably, this
brings the performance of "eval" as written in Scheme back to the level
of "eval" written in C, as in the days of Guile 1.8.
See "Just-In-Time Native Code" in the manual, for more information. JIT
compilation will be enabled automatically and transparently. To disable
JIT compilation, configure Guile with `--enable-jit=no' or
`--disable-jit'. The default is `--enable-jit=auto', which enables the
JIT if it is available. See `./configure --help' for more.
JIT compilation is enabled by default on x86-64, i686, ARMv7, and
** Lower-level bytecode
Relative to the virtual machine in Guile 2.2, Guile's VM instruction set
is now more low-level. This allows it to express more advanced
optimizations, for example type check elision or integer
devirtualization, and makes the task of JIT code generation easier.
Note that this change can mean that for a given function, the
corresponding number of instructions in Guile 3.0 may be higher than
Guile 2.2, which can lead to slowdowns when the function is interpreted.
We hope that JIT compilation more than makes up for this slight
** By default, GOOPS classes are not redefinable
It used to be that all GOOPS classes were redefinable, at least in
theory. This facility was supported by an indirection in all "struct"
instances, even though only a subset of structs would need redefinition.
We wanted to remove this indirection, in order to speed up Guile
records, allow immutable Guile records to eventually be described by
classes, and allow for some optimizations in core GOOPS classes that
shouldn't be redefined anyway.
Thus in GOOPS now there are classes that are redefinable and classes
that aren't. By default, classes created with GOOPS are not
redefinable. To make a class redefinable, it should be an instance of
`<redefinable-class>'. See "Redefining a Class" in the manual for more
* New deprecations
** scm_t_uint8, etc deprecated in favor of C99 stdint.h
It used to be that Guile defined its own `scm_t_uint8' because C99
`uint8_t' wasn't widely enough available. Now Guile finally made the
change to use C99 types, both internally and in Guile's public headers.
Note that this also applies to SCM_T_UINT8_MAX, SCM_T_INT8_MIN, for intN
and uintN for N in 8, 16, 32, and 64. Guile also now uses ptrdiff_t
instead of scm_t_ptrdiff, and similarly for intmax_t, uintmax_t,
intptr_t, and uintptr_t.
* Incompatible changes
** All deprecated code removed
All code deprecated in Guile 2.2 has been removed. See older NEWS, and
check that your programs can compile without linker warnings and run
without runtime warnings. See "Deprecation" in the manual.
In particular, the function `scm_generalized_vector_get_handle' which
was deprecated in 2.0.9 but remained in 2.2, has now finally been
removed. As a replacement, use `scm_array_get_handle' to get a handle
and `scm_array_handle_rank' to check the rank.
** Remove "self" field from vtables and "redefined" field from classes
These fields were used as part of the machinery for class redefinition
and is no longer needed.
** VM hook manipulation simplified
The low-level mechanism to instrument a running virtual machine for
debugging and tracing has been simplified. See "VM Hooks" in the
manual, for more.
* Changes to the distribution
** New effective version
The "effective version" of Guile is now 3.0, which allows parallel
installation with other effective versions (for example, the older Guile
2.2). See "Parallel Installations" in the manual for full details.
Notably, the `pkg-config' file is now `guile-3.0'.
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