518 lines
20 KiB
Plaintext
518 lines
20 KiB
Plaintext
$Id$
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Changes between 3.0 and 4.0:
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----------------------------
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* Nothing yet.
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Changes between 2.2 and 3.0:
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----------------------------
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General:
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* A new C/C++ Programmer's Manual for Elk is now available
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(60+ pages with many examples). See doc/README (item `cprog')
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and doc/cprog.
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* The documentation has been prepared for translation to HTML
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using the (Elk-based) `unroff' package.
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* Elk now uses a new Scheme object representation (a `struct' rather
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than an `unsigned long') to make it work on 64-bit architectures
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and to allow for larger heaps, a wider range of fixnums, and more
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first-class Scheme types.
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* As a consequence, the `pointer_constant_high_bits' are gone, as
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is util/pchb.c.
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* Elk has been ported to and tested on these new platforms (config
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files are included in the distribution):
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DEC/Alpha, OSF/1
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HP 9000, HP-UX 10.0
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i386/486, BSDI BSD/OS
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i386/486, Linux
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IBM PowerPC, AIX 4.1
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* A number of config files for obsolete platforms have been removed
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from the distribution; config files for platforms where Elk 3.0
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could not be tested are in config/untested. util/sgihack.c is gone.
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* Extension initialization and finalization functions now begin
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with `elk_init_' rather than just `init_' to avoid name conflicts.
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* The directory `contrib' has been removed from the distribution,
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as most of the contributions either were no longer maintained
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or have been made an official part of the distribution.
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contrib/eval-string is now available as lib/misc/elk-eval.c.
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* Site/platform-specific information such as the various X11 `load
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libraries', machine name, operating system name, as well as the
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Elk version number are now available as Scheme variables in
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scm/siteinfo.scm. The file is created automatically and can be
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loaded via `(require 'siteinfo)'.
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* Most of the improvements in scm/debug-new.scm have been merged
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into the baseline debug.scm and the former has been removed.
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The inspector now starts at the correct frame when called after
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an error.
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* examples/CC/class.c is a simple Elk extension demonstrating
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encapsulation of a C++ class in a Scheme type.
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* The file README has been renamed ROADMAP; RELEASE is now README.
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Interpreter kernel:
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* Many bugs have been fixed, and the code has been made `64-bit clean'.
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* New functions for application writers to read/set the `error tag'
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displayed in error messages and the application name (Get_Error_Tag,
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Set_Error_Tag, Set_App_Name).
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* When dynamically loading objects, the C++ static constructors are
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now called _before_ all extension initializers. Ditto for C++
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destructors and extension finalizers.
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* New function for application/extension writers to load a file
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whose name is given as a C string (Load_File).
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* Load_Source_Port has been made `official' and may be used from
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outside the interpreter.
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* New functions for application/extension writers to convert
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Scheme numbers to C unsigned int/long: Get_Unsigned,
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Get_Unsigned_Long, Get_Exact_Unsigned, Get_Exact_Unsigned_Long.
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New function Get_Exact_Long.
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* The `round' primitive now rounds to even for numbers halfway
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between two integers.
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* The reader doesn't impose a limit on the length of strings and
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symbols any longer.
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* The dynamic loading implementations now use the environment
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variable TMPDIR if present.
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* `dump' now works under SGI Irix 5.x.
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* New constants ELK_MINOR and ELK_MAJOR for application/extension
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writers.
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* Symbols containing special characters now print correctly when
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output with `write'.
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* Various optimizations in the interpreter's inner loop to compensate
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for the performance loss caused by the struct-based object
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representation on some platforms.
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Extensions:
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* The X11 extensions now work with X11 Release 6, Sun OpenWindows 3.x,
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and Sun Motif.
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* Extension-specific include files (unix.h, xlib.h, xt.h) are now
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installed in a subdirectory $install_dir/include/extensions
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for use by applications.
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* The object files for Athena or Motif widgets are now loaded
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by means of `require'.
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* New POSIX-style regular expression extension (see doc/regexp and
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examples/regexp).
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* The file hunk.c has been removed from lib/misc, as it no longer
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serves any purpose.
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* Several bugs have been fixed in the UNIX and X11 extensions.
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Changes between 2.1 and 2.2:
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----------------------------
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General:
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* Elk ported to new platforms: SGI Irix 5.1, HP-UX 9.0
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* All Scheme files now end with the suffix `.scm'
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* Introduced new symbols in the config files to be used by the
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UNIX extension
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* Reorganized the include files. Split external declarations
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into `private' (intern.h) and `public' (extern.h) declarations
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to be used by extensions
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* It's no longer necessary to specify multiple destination
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directories in the site file (only install_dir; subdirectories
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are created automatically)
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* `init_objects' is gone from the site file, see INSTALL for a
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new, simpler way to link extensions or an application with Elk
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statically
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* New directory $install_dir/lib is created with files module.o,
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standalone.o and shell scripts linkscheme, makedl, and ldflags
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(see INSTALL)
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* Elk can now be used by applications that must have their own
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main() function. See INSTALL for details.
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Interpreter kernel:
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* New primitives to allow blocking of signals from within Scheme
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code: disable-interrupts, enable-interrupts
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* Changed Disable_Interrupts and Enable_Interrupts macros to
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allow nesting and to handle signals used by extensions
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(specifically by the new UNIX extension)
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* Extended representation of continuations to carry current
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interrupt nesting level and restore it when being called
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* (Re-)enable interrupts in toplevel on error
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* Added default signal handlers for SIGPIPE and SIGHUP to clean
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up temporary files
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* New primitive: `features'
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* `require' now appends .scm to feature name to obtain file name
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(if no file name has been specified and if the feature name
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doesn't have a suffix yet)
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* Features elk:dump and elk:load-object are provided by the
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interpreter if dump and dynamic loading are supported
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* Implemented Register_Onfork() and Call_Onfork() to provide
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`fork handlers' (used, for instance, by the UNIX extension)
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* Added fork handlers to the dynamic loading implementations to
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create links for the temporary files
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* Added a close function to I/O ports to allow for pipe-based ports
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* New primitive: char-ready?
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* Added a check to the code that restarts a dumped interpreter
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to detect that the start address of the stack has been moved
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with respect to the original invocation (this happens between
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Sun-4c and Sun-4m architectures, for instance)
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* Modified math.c to implement the distinction between exact and
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inexact numbers as required by the language definition
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* New primitives: exact->inexact, inexact->exact
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* The number prefixes #e and #i are now supported
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* Floating point numbers are no longer automatically reduced to
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integers; new conversion function Make_Flonum(double) in
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addition to Make_Reduced_Flonum(double)
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* Added new conversion functions to cleanly distinguish between
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C ints and longs: Get_Long(Object), Make_Long(long),
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Make_Unsigned_Long(unsigned long), and functions to convert
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bignums from/to C longs
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* New conversion functions for exact integers:
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Get_Exact_Integer(Object) and Get_Exact_Long(Object)
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* Removed the unique `void' type; #v is now converted into the empty
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symbol by the reader; void? remains for compatibility
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* Implemented reader table for #-syntax
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* New function Define_Reader() to allow extensions to register
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their own read syntaxes (used by the new bitstring extension)
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* Exported parts of the reader to simplify writing new reader
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functions in extensions
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* New functions/macros to convert Scheme strings and/or symbols
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into C strings (to be used by extension writers): Get_String,
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Get_Strsym, Get_String_Stack, Get_Strsym_Stack; see src/cstring.c
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* Now obsolete: Declare_C_Strings, Dispose_C_Strings, Make_C_String
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* Bug fixes:
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o fixed a few bugs in the implementation of continuations and
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tail call optimization and in the generational, incremental
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garbage collector
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o there was a bug in the interaction between the garbage
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collector and `dump'
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o identified additional critical sections to be protected
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from delivery of signals
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o initscheme.scm wasn't resolved against the load-path
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o quasiquotation now also works for vectors (kudos to
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Tor Lillqvist for suggesting a simple fix)
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o a bug in src/load-ld.c could cause the first static variable
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in a dynamically loaded .o file to not be zeroed
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Extensions:
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* New UNIX extension; see doc/unix for the reference manual and
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examples/unix for a few demonstration programs
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* New record extension; see doc/record for the reference manual.
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The `struct' extension is now obsolete
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* New arbitrary-length bitstring extension; see doc/bitstring
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for the manual
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Changes between 2.0 and 2.1:
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----------------------------
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General:
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* New configuration files for the 386/486-PC running 386BSD and
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DOS/DJGPP, for Suns running Solaris 2.1 (SunOS 5.1, and for
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the Convex C230 running ConvexOS.
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* Reorganized the config files and the site file to allow for
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configuration of the generational, incremental garbage collector
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* Introduced several new symbols in the config files to simplify
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installation on several systems
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* Added new targets to all Makefiles to allow `cross-localization'
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of the source tree (see comments in DOS section in MACHINES)
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Interpreter kernel:
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* Added a generational, incremental garbage collector
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* New primitives: garbage-collect-status, collect-incremental
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* Reorganized the source files to accommodate the new garbage
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collector and to separate garbage collector specific code
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from code common to both garbage collectors
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* Empty list no longer counts as false; added primitive
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`empty-list-is-false-for-backward-compatibility'
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* Changed delimiter character in load-path argument of -p option
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from comma to colon
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* Initialize load-path from ELK_LOADPATH environment variable
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(if present)
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* Added argument to -v option to control which messages to print
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(linker command, init/finit functions)
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* It's no longer considered an error if an object file contains
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no initializers
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* Completely rewritten implementations of `dump' for ELF (SysVR4,
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Solaris 2.x), ECOFF (Ultrix, Irix), and HP9000 a.out formats;
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the HP version now correctly handles shared libraries
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* Added support for dynamic loading under SysVR4 and Solaris 2.x
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(see comments in MACHINES)
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* Added code to read symbol table of object files on the Convex
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* Bug fixes:
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o dynamic-wind was completely broken; fixed it
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o fixed a bug in the code that checks for the stack growing
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direction (caused dumped images to crash on startup)
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o fixed a bug in the equal? predicate (could enter an
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infinite loop when applied to environments)
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* Fixed a number of portability problems, among them:
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o added O_BINARY flag to open() calls and "b" mode to fopen()
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calls where necessary
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o added support for the many different ways to purge a file
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pointer and tty file descriptor (src/read.c, src/print.c)
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* Integrated the functionality of the `libutil.a' library from
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older releases into the interpreter kernel (conversion of
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symbols and lists of symbols to bit masks and vice versa;
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routines to manage a pool of weak pointers to objects, used
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mainly by the Elk X extensions
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Extensions:
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* Removed libutil.a (lib/util/*); moved the code into the
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interpreter kernel (src/terminate.c; src/symbol.c); removed
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libutil.a from the default load-libraries
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* Renamed lib/misc/c++.[co] to lib/misc/newhandler.[co] (c++.c isn't
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a valid filename under DOS)
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* Added finit function to lib/misc/monitor.c to switch off
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monitoring and write mon.out on exit
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Elk/X:
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* The X extensions are no longer pre-linked against the required
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X libraries (by means of ld -r); resolving against system libs
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now always takes place at load time
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* make-gcontext and copy-gcontext now can be called with a drawable
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(i.e. pixmap or window)
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* New primitives: alloc-color alloc-named-color
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* Removed window-unique-id primitive
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* Fixed a few bugs in the Xt extension (editres now works with
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Scheme programs); removed an artificial limitation
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* Defined a GC visit function for widgets that visits each widget's
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parents and the children of composite widgets
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* Added support for Motif gadgets
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Changes between 1.5 and 2.0:
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----------------------------
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General:
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* The build and install process has been improved significantly (see
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file INSTALL)
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* Added a new directory "config" that holds the system-specific
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configuration files and the site-file
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* Added a build shell script and a unified Makefile to all
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directories; "build" creates the ``real'' Makefiles containing
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system- and site-specific details during the make process
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* Added install, lint, clean, and distclean targets to all
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Makefiles
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* Placed files that are needed during runtime (dynamically loadable
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object files, Scheme files, the interpreter itself) into separate
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directories; added "make install" to put files there
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* Simplified porting Elk to new systems (assembly language support
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and a stack-extending version of "alloca" are no longer required)
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* Tested on several new systems (IBM RS/6000, HP9000/700, SGI,
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Sony; see the file MACHINES)
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* Placed new files CONTRIBUTORS, MIGRATE, and TODO into the toplevel
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directory of the distribution
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* Added a directory "util" that contains tools to simplify porting
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Elk to new environments and other utilities that are useful on
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some systems
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* Added a directory "scripts" that holds the shell scripts used
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to link instances of the interpreter and extensions.
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* Removed "stk" directory with test programs (no longer needed)
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* Added ANSI C prototypes and C++ "extern C" to all include files
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Interpreter kernel:
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* Placed include files into a separate directory (include)
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* Reorganized the source files (separate source files for different
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a.out formats and different dynamic loading mechanisms)
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* Changed the way new Scheme objects are allocated to support the
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generational garbage collector (not yet present in Elk)
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* Rewrote the code implementing continuations to support full
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call/cc on all machines
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* Fixed tail recursion optimization
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* Added support for POSIX signals (as alternative to BSD reliable
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signals)
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* Removed several artificial limitations (such as max. number of
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before-GC and after-GC functions and statically GC-linked objects)
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* Removed code that depended on max. number of open files per process
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* Added bi-directional ports (input-output-ports); new primitive:
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open-input-output-port
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* New primitive: port-line-number
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* Reader now prints line number on syntax error
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* Max. length of a pathname is now determined correctly (using the
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POSIX incantations if applicable)
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* Added code to support dynamic loading under HP-UX (src/load-shl.c)
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* Added code to call extension finalization functions and C++
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destructors on termination
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* Fixed and improved the code to call extension initialization
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functions and C++ constructors on startup or when loading
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extensions
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* Improved the mechanism to suppress initialization of statically
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linked extensions on startup ("dont_init_if_name" in config/site)
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* Can use ANSI "atexit" as alternative to redefining "exit"
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* Added option -p to specify load path
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* Scheme file "initscheme" is now loaded before the toplevel is
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loaded
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* Changed "rand" to use rand() if random() isn't there
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* re-entrant-continuations? primitive is no longer needed (returns
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always #t now)
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* Added a general mechanism to register termination functions for
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individual objects (e.g. to close files on GC); see src/terminate.c
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* linkscheme shell script improved; added code to support the
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stupid AIX linker
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* Fixed numerous things that caused lint or "gcc -ansi" to complain
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* Changed the dynamic loading, "dump", and a.out symbol table reading
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code in numerous places to make it work on new systems and to make
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it more readable and maintainable
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Extensions:
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* Combined lib/util/symbol.o and lib/util/objects.o into new library
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libutil.a; put this library into the default "load-libraries"
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* Moved lib/util/string.c and lib/util/string.h into the interpreter
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* Moved files from lib directory into new subdirectory "misc"
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* Added POSIX sysconf stuff to unix.c to determine max. number of
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open files per process
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Elk/X:
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* Made the code mostly "lint clean" and "gcc -ansi clean"
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* Fixed bogus variable definitions in xlib.h and xt.h
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* Xlib: added support for client-message event
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* Xt: added code to avoid a bug in Motif 1.1.4
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* Xt: added optional "mask" argument to context-add-input
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* Removed site-dependent information from scm/xwidgets (file is
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now created from scm/xwidgets.src during the build process)
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* Renamed widget .d files that were longer than 14 characters;
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added ALIASES file for each widget set containing mappings from
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real widget names to short names
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Documentation:
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* Added sub-directory "paper" containing a draft version of a
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paper about Elk
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User-contributed extensions:
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* A foreign function interface, an Elk Shell, and a vector extension
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have been contributed by J. P. Lewis (contrib/zelk).
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Changes between 1.4 and 1.5:
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----------------------------
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General:
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* Added a "contrib" directory for user-contributed extensions
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that I have not fully tested and/or integrated into Elk
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* Renamed ORIGIN to COPYRIGHT
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Interpreter kernel:
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* Added support for the Amiga, A/UX and System V Release 4
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(ELF a.out format)
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* Added special load-library for MIPS (-lc_G0)
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* Extension-interface: replaced Val() by Var_Set()/Var_Get()
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* Modified load, autoload, and require so that multiple .o-files
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can be loaded simultaneously
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* Added -1+ as a synonym for 1-
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* Bug fixes:
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o fixed a GC-related bug
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o fixed a bug that occurred when allocating a very large heap
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o fixed a bug in case-insensitive string comparison
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o fixed a bug in macro "when"
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o changed and clarified semantics of print-depth/print-length
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* IEEE 1178/R^4RS compatibility:
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o replaced close-port by close-input-port and close-output-port
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o added primitives caaaar .. cddddr
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o added peek-char primitive
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o added -i option for case-insensitive operation
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* Removed -bc option
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* Removed CBREAK-hack in read-char
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Elk/X:
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* Fixed several GC-related bugs (objects belonging to Xlib/Xt are
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no longer terminated by garbage collector when unreferenced)
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* Fixed a bug in the interface to the Grip widget
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* Modified code to load widgets to make use of new capability to
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load multiple .o-files
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Documentation:
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* Interpreter kernel: documented new functions, clarified
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some sections
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* Xlib/Xt: documented X-related behavior of garbage collector,
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pointed out GC-related pitfalls
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Changes between 1.3 and 1.4:
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----------------------------
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Interpreter kernel:
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* Support for the NeXT machines added
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* New primitive list? provided
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* Two bugs in the tail recursion code fixed
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* -v option to trace /bin/ld-calls
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* man-page written
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Elk/X:
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* Tested under X11R5
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* X11R3 and earlier versions are no longer supported
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* The HP-widget code has been removed from the distribution
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* New Xlib-primitives: install-colormap uninstall-colormap
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list-installed-colormaps xlib-release-5-or-later?
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* Xt interface now supports actions and accelerator tables
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* Bug in set-context-fallback-resources! fixed
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* New Xt-functions: widget-name widget-translate-coordinates
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application-initialize context-add-action install-accelerators
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install-all-accelerators xt-release-5-or-later?
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* Support for new widget classes: menubutton panner porthole repeater
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simplemenu sme smebsb smeline stripchart tree
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* vpaned renamed to paned
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* Example programs have been moved into a new examples directory
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with sub-directories for Scheme, Xlib, Xaw, Motif
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* New Xaw example programs that demonstrate the new widget classes,
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accelerators, actions, etc.
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Other extensions:
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* Interface to the GNU gdbm-library
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