Tcl extension for the LLVM C API
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README.md

Build Status

This is the llvmtcl extension based on the Tcl Extension Architecture (TEA). Please see the the Tcler's wiki page for more details.

This package is a freely available open source package. You can do virtually anything you like with it, such as modifying it, redistributing it, and selling it either in whole or in part. See the file license.terms for complete information.

REQUIREMENTS

CONTENTS

The following is a short description of the files you will find in the sample extension.

Name Purpose
Makefile.in Makefile template. The configure script uses this file to produce the final Makefile.
license.terms License info for this package.
aclocal.m4 Generated file. Do not edit. Autoconf uses this as input when generating the final configure script. See tcl.m4 below.
CMakeLists.txt CMake Build File.
configure Generated file. Do not edit. This must be regenerated any time configure.in or tclconfig/tcl.m4 changes.
configure.in Configure script template. Autoconf uses this file as input to produce the final configure script.
pkgIndex.tcl.in Package index template. The configure script will use this file as input to create pkgIndex.tcl.
llvmtcl-gen.inp Input for llvmtcl-gen.tcl. It contains reformatted function declarations of the LLVM C API.
llvmtcl-gen.tcl Script to generate the Tcl API to the LLVM C API. The llvmtcl-gen.inp is the input for this script.
generic/ This directory contains various source files, some only generated during compilation (i.e., after make).
generic/llvmtcl.cpp File containing most non-generated parts of the Tcl API to the LLVM C API. Also includes some sections which can only be implemented using the LLVM C++ API.
generic/llvmtcl.h File containing all the internal APIs of llvmtcl.
generic/attributes.cpp File containing the Tcl API to the LLVM attribute management code.
generic/debuginfo.cpp File containing the Tcl API to the LLVM debugging information generation code.
generic/powidf2.cpp File containing the implementation of one of the LLVM intrinsics, needed on some platforms and with some linkers.
generic/testcode.cpp Code only used for testing purposes.
generic/version.h Simplifies LLVM API version detection.
llvmtcl.tcl Scripts using the Tcl API to the LLVM C API.
tests/ Some tests for the package.
tclconfig/ This directory contains various template files that build the configure script. They should not need modification.
tclconfig/install-sh Program used for copying binaries and script files to their install locations.
tclconfig/tcl.m4 Collection of Tcl autoconf macros. Included by aclocal.m4 to define SC_* macros.
win/ Files used for building on Windows.

UNIX BUILD (including OSX)

This is a C++ extension, so make sure to set the CC environment variable to a c++ compiler (e.g. clang++ or g++).

Building under most UNIX systems is easy, just run the configure script and then run make. For more information about the build process, see the tcl/unix/README file in the Tcl src distribution. The following minimal example will build and install the extension:

$ cd llvmtcl
$ ./configure --with-tcl=... --with-llvm-config=...
$ make
$ make test
$ make install

WINDOWS BUILD

A basic build system based on the CMake project file generator is available. See CMake for details.

You can build the llvmtcl package with VisualStudio 12 like this:

64-Bit Build

You need to have built LLVM (version 4.0 or later) with CMake for x64 and should have an installed Tcl (e.g. ActiveTcl x64).

c:\devel\tclllvm> md build_x64
c:\devel\tclllvm> cd build_x64
c:\devel\tclllvm\build_x64> "c:\Program Files (x86)\CMake\bin\cmake.exe" -G"Visual Studio 12 2013 Win64" ..
c:\devel\tclllvm\build_x64> msbuild llvmtcl.sln /t:Build /p:Configuration=RelWithDebInfo /p:Platform="x64"

If you want to install the build, you can use the INSTALL target, which will install it in the location given by the CMAKE_INSTALL_PREFIX in a subdir like lib/llvmtcl3.9.

32-Bit Build

You need to have built LLVM (version 4.0 or later) with CMake for x86 and should have an installed Tcl (e.g. ActiveTcl win32).

c:\devel\tclllvm> md build_x86
c:\devel\tclllvm> cd build_x86
c:\devel\tclllvm\build_x86> "c:\Program Files (x86)\CMake\bin\cmake.exe" -G"Visual Studio 12 2013" ..
c:\devel\tclllvm\build_x86> msbuild llvmtcl.sln /t:Build /p:Configuration=RelWithDebInfo /p:Platform="Win32"

If you want to install the build, you can use the INSTALL target, which will install it in the location given by the CMAKE_INSTALL_PREFIX in a subdir like lib/llvmtcl3.9.

INSTALLATION

The installation of a TEA package is structure like so:

         $exec_prefix
          /       \
        lib       bin
         |         |
   PACKAGEx.y   (dependent .dll files on Windows)
         |
  pkgIndex.tcl (.so|.dll files)

The main .so|.dll library file gets installed in the versioned PACKAGE directory, which is OK on all platforms because it will be directly referenced with by load in the pkgIndex.tcl file. Dependent DLL files on Windows must go in the bin directory (or other directory on the user's PATH) in order for them to be found.

USING llvmtcl

  • To load the extension into a Tcl interpreter:

      package require llvmtcl
    
  • The package makes a llvmtcl ensemble command. The subcommands are the LLVM C API functions with LLVM trimmed from the front. All supported types, enumerators and functions can be found in llvmtcl-gen.inp.

  • Functions taking a pointer argument followed by an unsigned argument to specified the number of elements the pointer is pointing to are converted to ensemble commands where the pointer and the unsigned argument are replaced by a Tcl list.

EXAMPLES

examples/test.tcl - Example using the LLVM API to create a factorial function

examples/test2.tcl - Example using the LLVM API to create a function adding 4 and 6 to an argument, optimize that function and execute it.

examples/tebc.tcl - Example converting Tcl into LLVM

examples/ffidle.tcl - Example calling functions in shared libraries

For a more extensive example of use, see the tclquadcode project.