• README

  • Status
    ======
    
    libffi-3.0.12 was released on XXXXXXX.  Check the libffi web page for
    updates: <URL:http://sourceware.org/libffi/>.
    
    
    What is libffi?
    ===============
    
    Compilers for high level languages generate code that follow certain
    conventions. These conventions are necessary, in part, for separate
    compilation to work. One such convention is the "calling
    convention". The "calling convention" is essentially a set of
    assumptions made by the compiler about where function arguments will
    be found on entry to a function. A "calling convention" also specifies
    where the return value for a function is found.
    
    Some programs may not know at the time of compilation what arguments
    are to be passed to a function. For instance, an interpreter may be
    told at run-time about the number and types of arguments used to call
    a given function. Libffi can be used in such programs to provide a
    bridge from the interpreter program to compiled code.
    
    The libffi library provides a portable, high level programming
    interface to various calling conventions. This allows a programmer to
    call any function specified by a call interface description at run
    time.  
    
    FFI stands for Foreign Function Interface.  A foreign function
    interface is the popular name for the interface that allows code
    written in one language to call code written in another language. The
    libffi library really only provides the lowest, machine dependent
    layer of a fully featured foreign function interface. A layer must
    exist above libffi that handles type conversions for values passed
    between the two languages.
    
    
    Supported Platforms
    ===================
    
    Libffi has been ported to many different platforms.
    For specific configuration details and testing status, please
    refer to the wiki page here:
    
     http://www.moxielogic.org/wiki/index.php?title=Libffi_3.0.11
    
    At the time of release, the following basic configurations have been
    tested:
    
    |-----------------+------------------+-------------------------|
    | Architecture    | Operating System | Compiler                |
    |-----------------+------------------+-------------------------|
    | AArch64         | Linux            | GCC                     |
    | Alpha           | Linux            | GCC                     |
    | Alpha           | Tru64            | GCC                     |
    | ARM             | Linux            | GCC                     |
    | ARM             | iOS              | GCC                     |
    | AVR32           | Linux            | GCC                     |
    | Blackfin        | uClinux          | GCC                     |
    | HPPA            | HPUX             | GCC                     |
    | IA-64           | Linux            | GCC                     |
    | M68K            | FreeMiNT         | GCC                     |
    | M68K            | RTEMS            | GCC                     |
    | MIPS            | IRIX             | GCC                     |
    | MIPS            | Linux            | GCC                     |
    | MIPS            | RTEMS            | GCC                     |
    | MIPS64          | Linux            | GCC                     |
    | PowerPC 32-bit  | AIX 6.1.0.0      | IBM XL C/C++, V11.1     |
    | PowerPC 32-bit  | AIX 7.1.1.0      | IBM XL C/C++, V11.1     |
    | PowerPC         | AMIGA            | GCC                     |
    | PowerPC         | Linux            | GCC                     |
    | PowerPC         | Mac OSX          | GCC                     |
    | PowerPC         | FreeBSD          | GCC                     |
    | PowerPC64       | Linux            | GCC                     |
    | S390            | Linux            | GCC                     |
    | S390X           | Linux            | GCC                     |
    | SPARC           | Linux            | GCC                     |
    | SPARC           | Solaris          | GCC                     |
    | SPARC           | Solaris          | Oracle Solaris Studio C |
    | SPARC64         | Linux            | GCC                     |
    | SPARC64         | FreeBSD          | GCC                     |
    | SPARC64         | Solaris          | Oracle Solaris Studio C |
    | TILE-Gx/TILEPro | Linux            | GCC                     |
    | X86             | FreeBSD          | GCC                     |
    | X86             | Interix          | GCC                     |
    | X86             | kFreeBSD         | GCC                     |
    | X86             | Linux            | GCC                     |
    | X86             | Mac OSX          | GCC                     |
    | X86             | OpenBSD          | GCC                     |
    | X86             | OS/2             | GCC                     |
    | X86             | Solaris          | GCC                     |
    | X86             | Solaris          | Oracle Solaris Studio C |
    | X86             | Windows/Cygwin   | GCC                     |
    | X86             | Windows/MingW    | GCC                     |
    | X86-64          | FreeBSD          | GCC                     |
    | X86-64          | Linux            | GCC                     |
    | X86-64          | Linux/x32        | GCC                     |
    | X86-64          | OpenBSD          | GCC                     |
    | X86-64          | Solaris          | Oracle Solaris Studio C |
    | X86-64          | Windows/MingW    | GCC                     |
    | Xtensa          | Linux            | GCC                     |
    |-----------------+------------------+-------------------------|
    
    Please send additional platform test results to
    libffi-discuss@sourceware.org and feel free to update the wiki page
    above.
    
    Installing libffi
    =================
    
    First you must configure the distribution for your particular
    system. Go to the directory you wish to build libffi in and run the
    "configure" program found in the root directory of the libffi source
    distribution.
    
    You may want to tell configure where to install the libffi library and
    header files. To do that, use the --prefix configure switch.  Libffi
    will install under /usr/local by default. 
    
    If you want to enable extra run-time debugging checks use the the
    --enable-debug configure switch. This is useful when your program dies
    mysteriously while using libffi. 
    
    Another useful configure switch is --enable-purify-safety. Using this
    will add some extra code which will suppress certain warnings when you
    are using Purify with libffi. Only use this switch when using 
    Purify, as it will slow down the library.
    
    It's also possible to build libffi on Windows platforms with
    Microsoft's Visual C++ compiler.  In this case, use the msvcc.sh
    wrapper script during configuration like so:
    
    path/to/configure CC=path/to/msvcc.sh LD=link CPP=\"cl -nologo -EP\"
    
    For 64-bit Windows builds, use CC="path/to/msvcc.sh -m64".
    You may also need to specify --build appropriately. When building with MSVC
    under a MingW environment, you may need to remove the line in configure
    that sets 'fix_srcfile_path' to a 'cygpath' command. ('cygpath' is not
    present in MingW, and is not required when using MingW-style paths.)
    
    For iOS builds, the 'libffi.xcodeproj' Xcode project is available.
    
    Configure has many other options. Use "configure --help" to see them all.
    
    Once configure has finished, type "make". Note that you must be using
    GNU make.  You can ftp GNU make from prep.ai.mit.edu:/pub/gnu.
    
    To ensure that libffi is working as advertised, type "make check".
    This will require that you have DejaGNU installed.
    
    To install the library and header files, type "make install".
    
    
    History
    =======
    
    See the ChangeLog files for details.
    
    3.0.12 XXX-XX-XX
    	Add Blackfin support.
    	Add TILE-Gx/TILEPro support.
    	Add AArch64 support.
    	Add Xtensa support.
    	Add support for PaX enabled kernels with MPROTECT.
    	Add support for native vendor compilers on
    	  Solaris and AIX.
    
    3.0.11 Apr-11-12
            Lots of build fixes.
    	Add Amiga newer MacOS support.
    	Add support for variadic functions (ffi_prep_cif_var).
    	Add Linux/x32 support.
    	Add thiscall, fastcall and MSVC cdecl support on Windows.
    	Add Amiga and newer MacOS support.
    	Add m68k FreeMiNT support.
    	Integration with iOS' xcode build tools.
    	Fix Octeon and MC68881 support.
    	Fix code pessimizations.
    
    3.0.10 Aug-23-11
            Add support for Apple's iOS.
    	Add support for ARM VFP ABI.
            Add RTEMS support for MIPS and M68K.
    	Fix instruction cache clearing problems on
    	  ARM and SPARC.
    	Fix the N64 build on mips-sgi-irix6.5.
    	Enable builds with Microsoft's compiler.
    	Enable x86 builds with Oracle's Solaris compiler.
    	Fix support for calling code compiled with Oracle's Sparc
    	  Solaris compiler.
    	Testsuite fixes for Tru64 Unix.
    	Additional platform support.
    
    3.0.9 Dec-31-09
            Add AVR32 and win64 ports.  Add ARM softfp support.
    	Many fixes for AIX, Solaris, HP-UX, *BSD.
    	Several PowerPC and x86-64 bug fixes.
    	Build DLL for windows.
    
    3.0.8 Dec-19-08
            Add *BSD, BeOS, and PA-Linux support.
    
    3.0.7 Nov-11-08
            Fix for ppc FreeBSD.
    	(thanks to Andreas Tobler)
    
    3.0.6 Jul-17-08
            Fix for closures on sh.
    	Mark the sh/sh64 stack as non-executable.
    	(both thanks to Kaz Kojima)
    
    3.0.5 Apr-3-08
            Fix libffi.pc file.
    	Fix #define ARM for IcedTea users.
    	Fix x86 closure bug.
    
    3.0.4 Feb-24-08
            Fix x86 OpenBSD configury.
    
    3.0.3 Feb-22-08
            Enable x86 OpenBSD thanks to Thomas Heller, and
    	x86-64 FreeBSD thanks to Björn König and Andreas Tobler.
    	Clean up test instruction in README.
    
    3.0.2 Feb-21-08
            Improved x86 FreeBSD support.
    	Thanks to Björn König.
    
    3.0.1 Feb-15-08
            Fix instruction cache flushing bug on MIPS.
    	Thanks to David Daney.
    
    3.0.0 Feb-15-08
            Many changes, mostly thanks to the GCC project.
    	Cygnus Solutions is now Red Hat.
    
      [10 years go by...]
    
    1.20 Oct-5-98
    	Raffaele Sena produces ARM port.
    
    1.19 Oct-5-98
    	Fixed x86 long double and long long return support.
    	m68k bug fixes from Andreas Schwab.
    	Patch for DU assembler compatibility for the Alpha from Richard
    	Henderson.
    
    1.18 Apr-17-98
    	Bug fixes and MIPS configuration changes.
    
    1.17 Feb-24-98
    	Bug fixes and m68k port from Andreas Schwab. PowerPC port from
    	Geoffrey Keating. Various bug x86, Sparc and MIPS bug fixes.
    
    1.16 Feb-11-98
    	Richard Henderson produces Alpha port.
    
    1.15 Dec-4-97
    	Fixed an n32 ABI bug. New libtool, auto* support.
    
    1.14 May-13-97
    	libtool is now used to generate shared and static libraries.
    	Fixed a minor portability problem reported by Russ McManus
    	<mcmanr@eq.gs.com>.
    
    1.13 Dec-2-96
    	Added --enable-purify-safety to keep Purify from complaining
    	about certain low level code.
    	Sparc fix for calling functions with < 6 args.
    	Linux x86 a.out fix.
    
    1.12 Nov-22-96
    	Added missing ffi_type_void, needed for supporting void return 
    	types. Fixed test case for non MIPS machines. Cygnus Support 
    	is now Cygnus Solutions. 
    
    1.11 Oct-30-96
    	Added notes about GNU make.
    
    1.10 Oct-29-96
    	Added configuration fix for non GNU compilers.
    
    1.09 Oct-29-96
    	Added --enable-debug configure switch. Clean-ups based on LCLint 
    	feedback. ffi_mips.h is always installed. Many configuration 
    	fixes. Fixed ffitest.c for sparc builds.
    
    1.08 Oct-15-96
    	Fixed n32 problem. Many clean-ups.
    
    1.07 Oct-14-96
    	Gordon Irlam rewrites v8.S again. Bug fixes.
    
    1.06 Oct-14-96
    	Gordon Irlam improved the sparc port. 
    
    1.05 Oct-14-96
    	Interface changes based on feedback.
    
    1.04 Oct-11-96
    	Sparc port complete (modulo struct passing bug).
    
    1.03 Oct-10-96
    	Passing struct args, and returning struct values works for
    	all architectures/calling conventions. Expanded tests.
    
    1.02 Oct-9-96
    	Added SGI n32 support. Fixed bugs in both o32 and Linux support.
    	Added "make test".
    
    1.01 Oct-8-96
    	Fixed float passing bug in mips version. Restructured some
    	of the code. Builds cleanly with SGI tools.
    
    1.00 Oct-7-96
    	First release. No public announcement.
    
    
    Authors & Credits
    =================
    
    libffi was originally written by Anthony Green <green@redhat.com>.
    
    The developers of the GNU Compiler Collection project have made
    innumerable valuable contributions.  See the ChangeLog file for
    details.
    
    Some of the ideas behind libffi were inspired by Gianni Mariani's free
    gencall library for Silicon Graphics machines.
    
    The closure mechanism was designed and implemented by Kresten Krab
    Thorup.
    
    Major processor architecture ports were contributed by the following
    developers:
    
    aarch64		Marcus Shawcroft, James Greenhalgh
    alpha		Richard Henderson
    arm		Raffaele Sena
    blackfin        Alexandre Keunecke I. de Mendonca
    cris		Simon Posnjak, Hans-Peter Nilsson
    frv		Anthony Green
    ia64		Hans Boehm
    m32r		Kazuhiro Inaoka
    m68k		Andreas Schwab
    mips		Anthony Green, Casey Marshall
    mips64		David Daney
    pa		Randolph Chung, Dave Anglin, Andreas Tobler
    powerpc		Geoffrey Keating, Andreas Tobler, 
    			 David Edelsohn, John Hornkvist
    powerpc64	Jakub Jelinek
    s390		Gerhard Tonn, Ulrich Weigand
    sh		Kaz Kojima
    sh64		Kaz Kojima
    sparc		Anthony Green, Gordon Irlam
    tile-gx/tilepro Walter Lee
    x86		Anthony Green, Jon Beniston
    x86-64		Bo Thorsen
    xtensa		Chris Zankel
    
    Jesper Skov and Andrew Haley both did more than their fair share of
    stepping through the code and tracking down bugs.
    
    Thanks also to Tom Tromey for bug fixes, documentation and
    configuration help.
    
    Thanks to Jim Blandy, who provided some useful feedback on the libffi
    interface.
    
    Andreas Tobler has done a tremendous amount of work on the testsuite.
    
    Alex Oliva solved the executable page problem for SElinux.
    
    The list above is almost certainly incomplete and inaccurate.  I'm
    happy to make corrections or additions upon request.
    
    If you have a problem, or have found a bug, please send a note to the
    author at green@moxielogic.com, or the project mailing list at
    libffi-discuss@sourceware.org.