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Reorganized it too. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114151 91177308-0d34-0410-b5e6-96231b3b80d8
346 lines
12 KiB
HTML
346 lines
12 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>Getting Started with LLVM System for Microsoft Visual Studio</title>
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<link rel="stylesheet" href="llvm.css" type="text/css">
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</head>
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<body>
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<div class="doc_title">
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Getting Started with the LLVM System using Microsoft Visual Studio
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</div>
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<ul>
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<li><a href="#overview">Overview</a>
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<li><a href="#requirements">Requirements</a>
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<ol>
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<li><a href="#hardware">Hardware</a>
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<li><a href="#software">Software</a>
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</ol></li>
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<li><a href="#quickstart">Getting Started</a>
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<li><a href="#tutorial">An Example Using the LLVM Tool Chain</a>
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<li><a href="#problems">Common Problems</a>
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<li><a href="#links">Links</a>
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</ul>
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<div class="doc_author">
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<p>Written by:
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<a href="mailto:jeffc@jolt-lang.org">Jeff Cohen</a>
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</p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="overview"><b>Overview</b></a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>The Visual Studio port has some limitations. It is suitable for
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use if you are writing your own compiler front end or otherwise have a
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need to dynamically generate machine code. The JIT and interpreter are
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functional, but it is currently not possible to generate assembly code which
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is then assembled into an executable. You can output object files
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in COFF format, though. You can also indirectly create executables
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by using the C backend.</p>
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<p><tt>llvm-gcc</tt> is based on GCC, which cannot be bootstrapped
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using VC++. There are <tt>llvm-gcc</tt> binaries based on MinGW
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available on the
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LLVM <a href="http://www.llvm.org/releases/download.html"> download
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page</a>. Eventually, <a href="http://clang.llvm.org">Clang</a>
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will be able to produce executables on Windows.</p>
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<p><tt>bugpoint</tt> does build, but does not work. The other tools
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'should' work, but have not been fully tested.</p>
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<p>Additional information about the LLVM directory structure and tool chain
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can be found on the main <a href="GettingStarted.html">Getting Started</a>
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page.</p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="requirements"><b>Requirements</b></a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>Before you begin to use the LLVM system, review the requirements given
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below. This may save you some trouble by knowing ahead of time what hardware
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and software you will need.</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection">
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<a name="hardware"><b>Hardware</b></a>
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</div>
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<div class="doc_text">
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<p>Any system that can adequately run Visual Studio .NET 2005 SP1 is fine.
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The LLVM source tree and object files, libraries and executables will consume
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approximately 3GB.</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="software"><b>Software</b></a></div>
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<div class="doc_text">
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<p>You will need Visual Studio .NET 2005 SP1 or higher. The VS2005 SP1
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beta and the normal VS2005 still have bugs that are not completely
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compatible. VS2003 would work except (at last check) it has a bug with
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friend classes that you can work-around with some minor code rewriting
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(and please submit a patch if you do). Earlier versions of Visual Studio
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do not support the C++ standard well enough and will not work.</p>
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<p>You will also need the <a href="http://www.cmake.org/">CMake</a> build
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system since it generates the project files you will use to build with.</p>
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<p>
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Do not install the LLVM directory tree into a path containing spaces (e.g.
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C:\Documents and Settings\...) as the configure step will fail.</p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="quickstart"><b>Getting Started</b></a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>Here's the short story for getting up and running quickly with LLVM:</p>
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<ol>
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<li>Read the documentation.</li>
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<li>Seriously, read the documentation.</li>
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<li>Remember that you were warned twice about reading the documentation.</li>
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<li>Get the Source Code
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<ul>
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<li>With the distributed files:
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<ol>
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<li><tt>cd <i>where-you-want-llvm-to-live</i></tt>
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<li><tt>gunzip --stdout llvm-<i>version</i>.tar.gz | tar -xvf -</tt>
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<i> or use WinZip</i>
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<li><tt>cd llvm</tt></li>
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</ol></li>
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<li>With anonymous Subversion access:
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<ol>
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<li><tt>cd <i>where-you-want-llvm-to-live</i></tt></li>
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<li><tt>svn co http://llvm.org/svn/llvm-project/llvm-top/trunk llvm-top
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</tt></li>
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<li><tt>make checkout MODULE=llvm</tt>
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<li><tt>cd llvm</tt></li>
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</ol></li>
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</ul></li>
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<li> Use <a href="http://www.cmake.org/">CMake</a> to generate up-to-date
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project files:
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<ul>
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<li>Once CMake is installed then the most simple way is to just
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start the CMake GUI, select the directory where you have LLVM
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extracted to, and the default options should all be fine. One
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option you may really want to change, regardless of anything
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else, might be the CMAKE_INSTALL_PREFIX setting to select a
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directory to INSTALL to once compiling is complete, although
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installation is not mandatory for using LLVM. Another
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important option is LLVM_TARGETS_TO_BUILD, which controls the
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LLVM target architectures that are included on the build. If
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you want to run the <a href="#tutorial">example described
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below</a> you must set that variable to "X86;CBackend".</li>
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<li>See the <a href="CMake.html">LLVM CMake guide</a> for
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detailed information about how to configure the LLVM
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build.</li>
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</ul>
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</li>
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<li>Start Visual Studio
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<ul>
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<li>In the directory you created the project files will have
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an <tt>llvm.sln</tt> file, just double-click on that to open
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Visual Studio.</li>
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</ul></li>
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<li>Build the LLVM Suite:
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<ul>
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<li>The projects may still be built individually, but
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to build them all do not just select all of them in batch build (as some
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are meant as configuration projects), but rather select and build just
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the ALL_BUILD project to build everything, or the INSTALL project, which
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first builds the ALL_BUILD project, then installs the LLVM headers, libs,
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and other useful things to the directory set by the CMAKE_INSTALL_PREFIX
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setting when you first configured CMake.</li>
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<li>The Fibonacci project is a sample program that uses the JIT.
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Modify the project's debugging properties to provide a numeric
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command line argument or run it from the command line. The
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program will print the corresponding fibonacci value.</li>
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</ul></li>
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</ol>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="tutorial">An Example Using the LLVM Tool Chain</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<ol>
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<li><p>First, create a simple C file, name it 'hello.c':</p>
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<div class="doc_code">
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<pre>
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#include <stdio.h>
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int main() {
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printf("hello world\n");
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return 0;
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}
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</pre></div></li>
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<li><p>Next, compile the C file into a LLVM bitcode file:</p>
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<div class="doc_code">
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<pre>
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% llvm-gcc -c hello.c -emit-llvm -o hello.bc
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</pre>
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</div>
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<p>This will create the result file <tt>hello.bc</tt> which is the LLVM
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bitcode that corresponds the the compiled program and the library
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facilities that it required. You can execute this file directly using
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<tt>lli</tt> tool, compile it to native assembly with the <tt>llc</tt>,
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optimize or analyze it further with the <tt>opt</tt> tool, etc.</p>
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<p><b>Note: you will need the llvm-gcc binaries from the
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LLVM <a href="http://www.llvm.org/releases/download.html">
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download page</a></b></p></li>
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<li><p>Run the program using the just-in-time compiler:</p>
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<div class="doc_code">
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<pre>
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% lli hello.bc
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</pre>
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</div>
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<p>Note: this will only work for trivial C programs. Non-trivial programs
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(and any C++ program) will have dependencies on the GCC runtime that
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won't be satisfied by the Microsoft runtime libraries.</p></li>
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<li><p>Use the <tt>llvm-dis</tt> utility to take a look at the LLVM assembly
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code:</p>
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<div class="doc_code">
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<pre>
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% llvm-dis < hello.bc | more
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</pre>
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</div></li>
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<li><p>Compile the program to C using the LLC code generator:</p>
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<div class="doc_code">
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<pre>
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% llc -march=c hello.bc
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</pre>
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<p><b>Note: you need to add the C backend to the LLVM build,
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which amounts to setting the CMake
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variable <i>LLVM_TARGETS_TO_BUILD</i> to "X86;CBackend" when
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you generate the VS solution files. See
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the <a href="CMake.html">LLVM CMake guide</a> for more
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information about how to configure the LLVM
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build.</b></p></li>
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</div></li>
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<li><p>Compile to binary using Microsoft C:</p>
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<div class="doc_code">
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<pre>
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% cl hello.cbe.c
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</pre>
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</div>
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<p>Note: this will only work for trivial C programs. Non-trivial programs
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(and any C++ program) will have dependencies on the GCC runtime that won't
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be satisfied by the Microsoft runtime libraries.</p></li>
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<li><p>Execute the native code program:</p>
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<div class="doc_code">
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<pre>
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% hello.cbe.exe
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</pre>
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</div></li>
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</ol>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="problems">Common Problems</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>If you are having problems building or using LLVM, or if you have any other
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general questions about LLVM, please consult the <a href="FAQ.html">Frequently
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Asked Questions</a> page.</p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="links">Links</a>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>This document is just an <b>introduction</b> to how to use LLVM to do
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some simple things... there are many more interesting and complicated things
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that you can do that aren't documented here (but we'll gladly accept a patch
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if you want to write something up!). For more information about LLVM, check
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out:</p>
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<ul>
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<li><a href="http://llvm.org/">LLVM homepage</a></li>
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<li><a href="http://llvm.org/doxygen/">LLVM doxygen tree</a></li>
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<li><a href="http://llvm.org/docs/Projects.html">Starting a Project
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that Uses LLVM</a></li>
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</ul>
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</div>
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<!-- *********************************************************************** -->
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<hr>
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<address>
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<a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS"></a>
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<a href="http://validator.w3.org/check/referer"><img
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src="http://www.w3.org/Icons/valid-html401-blue" alt="Valid HTML 4.01"></a>
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<a href="mailto:jeffc@jolt-lang.org">Jeff Cohen</a><br>
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<a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br>
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Last modified: $Date$
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</address>
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</body>
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</html>
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