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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html> <html>
<head> <head>
<title>Getting Started with LLVM System</title> <title>Getting Started with LLVM System</title>
</head> </head>
<body bgcolor="white">
<body bgcolor=white>
<center><h1>Getting Started with the LLVM System<br><font size=3>By: <a <center>
href="mailto:gshi1@uiuc.edu">Guochun Shi</a>, <h1>Getting Started with the LLVM System<br>
<a href="mailto:sabre@nondot.org">Chris Lattner</a> and <font size="3">By: <a href="mailto:gshi1@uiuc.edu">Guochun Shi</a>, <a
<a href="http://www.cs.uiuc.edu/~vadve">Vikram Adve</a> href="mailto:sabre@nondot.org">Chris Lattner</a> and <a
</font></h1></center> href="http://www.cs.uiuc.edu/%7Evadve">Vikram Adve</a> </font></h1>
</center>
<!--=====================================================================--> <!--=====================================================================-->
<h2><a name="Contents">Contents</a></h2>
<!--=====================================================================--> <h2><a name="Contents">Contents</a></h2>
<!--=====================================================================-->
<ul>
<li><a href="#overview">Overview</a> <ul>
<li><a href="#starting">Getting started with LLVM</a> <li><a href="#overview">Overview</a> </li>
<ol> <li><a href="#starting">Getting started with LLVM</a>
<li><a href="#quickstart">Getting started quickly (a summary)</a>
<li><a href="#checkout">Checkout LLVM from CVS</a>
<li><a href="#terminology">Terminology and Notation</tt></a>
<li><a href="#objfiles">The location for object files</tt></a>
<li><a href="#config">Local Configuration Options</tt></a>
<li><a href="#environment">Setting up your environment</a>
<li><a href="#compile">Compiling the source code</a>
</ol>
<li><a href="#layout">Program layout</a>
<ol>
<li><a href="#cvsdir">CVS directories</a>
<li><a href="#dd"><tt>Depend</tt>, <tt>Debug</tt>, &amp;
<tt>Release</tt> directories</a></li>
<li><a href="#include"><tt>llvm/include</tt></a>
<li><a href="#lib"><tt>llvm/lib</tt></a>
<li><a href="#test"><tt>llvm/test</tt></a>
<li><a href="#tools"><tt>llvm/tools</tt></a>
</ol>
<li><a href="#tutorial">An example using the LLVM tool chain</a>
<li><a href="#links">Links</a>
</ul>
<!--=====================================================================-->
<center>
<h2><a name="overview"><b>Overview</b></a></h2>
</center>
<!--=====================================================================-->
<p>The <a href"starting">next section</a> of this guide is meant to get
you up and running with LLVM, and to give you some basic information about
the LLVM environment. The <a href"#quickstart">first subsection</a> gives
a short summary for those who are already familiar with the system and
want to get started as quickly as possible.
<p>The later sections of this guide describe the <a
href"#layout">general layout</a> of the the LLVM source-tree, a <a
href="#tutorial">simple example</a> using the LLVM tool chain, and <a
href="#links">links</a> to find more information about LLVM or to get
help via e-mail.
<!--=====================================================================-->
<center>
<h2><a name="starting"><b>Getting Started</b></a></h2>
</center>
<!--=====================================================================-->
<!--=====================================================================-->
<h3><a name="quickstart"><b>Getting Started Quickly (A Summary)</b></a></h3>
<!--=====================================================================-->
Here's the short story for getting up and running quickly with LLVM:
<ol> <ol>
<li>Find the path to the CVS repository containing LLVM (we'll call this <i>CVSROOTDIR</i>). <li><a href="#quickstart">Getting started quickly (a summary)</a>
<li><tt>cd <i>where-you-want-llvm-to-live</i></tt> </li>
<li><tt>cvs -d <i>CVSROOTDIR</i> checkout llvm</tt> <li><a href="#checkout">Checkout LLVM from CVS</a> </li>
<li><tt>cd llvm</tt> <li><a href="#terminology">Terminology and Notation</a> </li>
<li>Edit <tt>Makefile.config</tt> to set local paths. This includes <li><a href="#objfiles">The location for object files</a> </li>
setting the install location of the C frontend, and the various paths <li><a href="#config">Local Configuration Options</a> </li>
to the C and C++ compilers used to build LLVM itself. <li><a href="#environment">Setting up your environment</a>
<li>Set your LLVM_LIB_SEARCH_PATH environment variable. </li>
<li><tt>gmake -k |& tee gnumake.out <li><a href="#compile">Compiling the source code</a> </li>
&nbsp;&nbsp;&nbsp;# this is csh or tcsh syntax</tt>
</ol> </ol>
</li>
<p>See <a href="#environment">Setting up your environment</a> on tips to <li><a href="#layout">Program layout</a>
simplify working with the LLVM front-end and compiled tools. See the <ol>
other sub-sections below for other useful details in working with LLVM, <li><a href="#cvsdir">CVS directories</a> </li>
or go straight to <a href="#layout">Program Layout</a> to learn about the <li><a href="#dd"><tt>Depend</tt>, <tt>Debug</tt>, &amp;
layout of the source code tree. <tt>Release</tt> directories</a></li>
<li><a href="#include"><tt>llvm/include</tt></a> </li>
<!-------------------------------------------------------------------------> <li><a href="#lib"><tt>llvm/lib</tt></a> </li>
<h3><a name="terminology">Terminology and Notation</a></h3> <li><a href="#test"><tt>llvm/test</tt></a> </li>
<!-------------------------------------------------------------------------> <li><a href="#tools"><tt>llvm/tools</tt></a> </li>
</ol>
<p>Through this manual, the following names are used to denote paths </li>
specific to the local system and working environment. <i>These are not <li><a href="#tutorial">An example using the LLVM tool chain</a>
environment variables you need to set, but just strings used in the rest </li>
of this document below.</i>. In any of the examples below, simply replace <li><a href="#links">Links</a> </li>
each of these names with the appropriate pathname on your local system. </ul>
<!--=====================================================================-->
<center>
<h2><a name="overview"><b>Overview</b></a></h2>
</center>
<!--=====================================================================-->
<p>The <a href="" starting="">next section</a> of this guide is meant to
get you up and running with LLVM, and to give you some basic information
about the LLVM environment. The <a href="" #quickstart="">first subsection</a>
gives a short summary for those who are already familiar with the system
and want to get started as quickly as possible. </p>
<p>The later sections of this guide describe the <a href="" #layout="">general
layout</a> of the LLVM source-tree, a <a href="#tutorial">simple example</a>
using the LLVM tool chain, and <a href="#links">links</a> to find more information
about LLVM or to get help via e-mail. <!--=====================================================================-->
</p>
<center>
<h2><a name="starting"><b>Getting Started</b></a></h2>
</center>
<!--=====================================================================-->
<!--=====================================================================-->
<h3><a name="quickstart"><b>Getting Started Quickly (A Summary)</b></a></h3>
<!--=====================================================================-->
Here's the short story for getting up and running quickly with LLVM:
<ol>
<li>Find the path to the CVS repository containing LLVM (we'll call
this <i>CVSROOTDIR</i>). </li>
<li><tt>cd <i>where-you-want-llvm-to-live</i></tt> </li>
<li><tt>cvs -d <i>CVSROOTDIR</i> checkout llvm</tt> </li>
<li><tt>cd llvm</tt> </li>
<li>Edit <tt>Makefile.config</tt> to set local paths. This includes
setting the install location of the C frontend and the various paths
to the C and C++ compilers used to build LLVM itself. </li>
<li>Set your LLVM_LIB_SEARCH_PATH environment variable. </li>
<li><tt>gmake -k |&amp; tee gnumake.out &nbsp;&nbsp;&nbsp;# this is
csh or tcsh syntax</tt> </li>
</ol>
<p>See <a href="#environment">Setting up your environment</a> on tips to
simplify working with the LLVM front-end and compiled tools. See the
other sub-sections below for other useful details in working with LLVM,
or go straight to <a href="#layout">Program Layout</a> to learn about
the layout of the source code tree. <!------------------------------------------------------------------------->
</p>
<h3><a name="terminology">Terminology and Notation</a></h3>
<!------------------------------------------------------------------------->
<p>Through this manual, the following names are used to denote paths
specific to the local system and working environment. <i>These are not
environment variables you need to set, but just strings used in the rest
of this document below</i>. In any of the examples below, simply replace
each of these names with the appropriate pathname on your local system.
All these paths are absolute:</p> All these paths are absolute:</p>
<ul>
</ul> <ul>
<!-------------------------------------------------------------------------> </ul>
<h3><a name="checkout">Checkout LLVM from CVS</a></h3> <!------------------------------------------------------------------------->
<!------------------------------------------------------------------------->
<h3><a name="checkout">Checkout LLVM from CVS</a></h3>
<p>Before checking out the source code, you will need to know the path to <!------------------------------------------------------------------------->
CVS repository containing LLVM source code (we'll call this
<i>CVSROOTDIR</i> below). Ask the person responsible for your local LLVM <p>Before checking out the source code, you will need to know the path to
installation to give you this path. the CVS repository containing LLVM source code (we'll call this <i>CVSROOTDIR</i>
below). Ask the person responsible for your local LLVM installation
<p>To get a fresh copy of the entire source code, all you to give you this path. </p>
need to do is check it out from CVS as follows: <p>To get a fresh copy of the entire source code, all you need to do
<ul> is check it out from CVS as follows: </p>
<li><tt>cd <i>where-you-want-llvm-to-live</i></tt> <ul>
<li><tt>cvs -d <i>CVSROOTDIR</i> checkout llvm</tt></p> <li><tt>cd <i>where-you-want-llvm-to-live</i></tt> </li>
</ul> <li><tt>cvs -d <i>CVSROOTDIR</i> checkout llvm</tt>
<p></p>
<p>This will create an '<tt>llvm</tt>' directory in the current </li>
directory and fully populate it with the LLVM source code, Makefiles, </ul>
test directories, and local copies of documentation files.</p>
<p>This will create an '<tt>llvm</tt>' directory in the current directory
<!-------------------------------------------------------------------------> and fully populate it with the LLVM source code, Makefiles, test directories,
<h3><a name="config">Local Configuration Options</a></h3> and local copies of documentation files.</p>
<!-------------------------------------------------------------------------> <!------------------------------------------------------------------------->
<p>The file <tt>llvm/Makefile.config</tt> <h3><a name="config">Local Configuration Options</a></h3>
defines the following path variables, <!------------------------------------------------------------------------->
which are specific to a particular installation of LLVM.
These should need to be modified only once after checking out a copy <p>The file <tt>llvm/Makefile.config</tt> defines the following path
of LLVM (if the default values do not already match your system): variables which are specific to a particular installation of LLVM.
These should need to be modified only once after checking out a copy
<ul> of LLVM (if the default values do not already match your system):
<p><li><i>CXX</i> = Path to C++ compiler to use. </p>
<p><li><i>LLVM_OBJ_DIR</i> = Path to the llvm directory where <ul>
object files should be placed.
(See the Section on <a href=#objfiles> <p></p>
The location for LLVM object files</a> <li><i>CXX</i> = Path to C++ compiler to use.
for more information.) <p></p>
<p><li><i>LLVMGCCDIR</i> = Path to the location of the LLVM front-end </li>
binaries and associated libraries. <li><i>OBJ_ROOT</i> = Path to the llvm directory where object files
<p><li><i>PURIFY</i> = Path to the purify program. should be placed. (See the Section on <a href="#objfiles"> The
</ul> location for LLVM object files</a> for more information.)
<p></p>
In addition to settings in this file, you must set a </li>
<tt>LLVM_LIB_SEARCH_PATH</tt> environment variable in your startup scripts. <li><i>LLVMGCCDIR</i> = Path to the location of the LLVM front-end
This environment variable is used to locate "system" libraries like binaries and associated libraries.
"<tt>-lc</tt>" and "<tt>-lm</tt>" when linking. This variable should be set <p></p>
to the absolute path for the bytecode-libs subdirectory of the C front-end </li>
install. For example, <li><i>PURIFY</i> = Path to the purify program. </li>
<tt>/home/vadve/lattner/local/x86/llvm-gcc/bytecode-libs</tt> for the X86 </ul>
version of the C front-end, on our research machines.<p> In addition to settings in this file, you must set a <tt>LLVM_LIB_SEARCH_PATH</tt>
environment variable in your startup scripts. This environment variable
<!-------------------------------------------------------------------------> is used to locate "system" libraries like "<tt>-lc</tt>" and "<tt>-lm</tt>"
<h3><a name="objfiles">The location for LLVM object files</a></h3> when linking. This variable should be set to the absolute path for the
<!-------------------------------------------------------------------------> bytecode-libs subdirectory of the C front-end install. For example,
<tt>/home/vadve/lattner/local/x86/llvm-gcc/bytecode-libs</tt> is used
<p>The LLVM make system sends most output files generated during the build for the X86 version of the C front-end on our research machines.
into the directory defined by the variable LLVM_OBJ_DIR in <p> <!------------------------------------------------------------------------->
<tt>llvm/Makefile.config</tt>. This can be either just your normal LLVM </p>
source tree or some other directory writable by you. You may wish to put <h3><a name="objfiles">The location for LLVM object files</a></h3>
object files on a different filesystem either to keep them from being backed <!------------------------------------------------------------------------->
up or to speed up local builds.
<p>The LLVM make system sends most output files generated during the build
<p>If you do not wish to use a different location for object files (building into the directory defined by the variable OBJ_ROOT in <tt>llvm/Makefile.config</tt>.
into the source tree directly), just set this variable to ".".<p> This can be either just your normal LLVM source tree or some other directory
writable by you. You may wish to put object files on a different filesystem
<!-------------------------------------------------------------------------> either to keep them from being backed up or to speed up local builds.
<h3><a name="environment">Setting up your environment</a></h3> </p>
<!-------------------------------------------------------------------------> <p>If you do not wish to use a different location for object files (i.e.
building into the source tree directly), just set this variable to ".".</p>
<i>NOTE: This step is optional but will set up your environment so you <p> <!------------------------------------------------------------------------->
can use the compiled LLVM tools with as little hassle as </p>
possible.</i>) <h3><a name="environment">Setting up your environment</a></h3>
<!------------------------------------------------------------------------->
<p>Add the following lines to your <tt>.cshrc</tt> (or the corresponding <i>NOTE: This step is optional but will set up your environment so you
lines to your <tt>.profile</tt> if you use a bourne shell derivative). can use the compiled LLVM tools with as little hassle as possible.</i>)
<pre> <p>Add the following lines to your <tt>.cshrc</tt> (or the corresponding
# Make the C front end easy to use... lines to your <tt>.profile</tt> if you use a bourne shell derivative).
alias llvmgcc <i>LLVMGCCDIR</i><tt>/bin/llvm-gcc</tt> </p>
<pre> # Make the C front end easy to use...<br> alias llvmgcc <i>LLVMGCCDIR</i><tt>/bin/llvm-gcc</tt>
# Make the LLVM tools easy to use... # Make the LLVM tools easy to use...
setenv PATH <i>LLVM_OBJ_DIR</i>/llvm/tools/Debug:${PATH} setenv PATH <i>OBJ_ROOT</i>/llvm/tools/Debug:${PATH}<br> </pre>
</pre> The <tt>llvmgcc</tt> alias is useful because the C compiler is not
The <tt>llvmgcc</tt> alias is useful because the C compiler is not included in the CVS tree you just checked out.
included in the CVS tree you just checked out. <p>The other <a href="#tools">LLVM tools</a> are part of the LLVM source
base and are built when compiling LLVM. They will be built into the
<tt><i>OBJ_ROOT</i>/tools/Debug</tt> directory.</p>
<!------------------------------------------------------------------------->
<p>The other <a href="#tools">LLVM tools</a> are part of the LLVM <h3><a name="compile">Compiling the source code</a></h3>
source base, and built when compiling LLVM. They will be built into the <!------------------------------------------------------------------------->
<tt><i>LLVM_OBJ_DIR</i>/tools/Debug</tt> directory.</p>
<p>Every directory in the LLVM source tree includes a <tt>Makefile</tt> to
<!-------------------------------------------------------------------------> build it and any subdirectories that it contains. These makefiles require
<h3><a name="compile">Compiling the source code</a></h3> GNU Make (<tt>gmake)</tt> instead of <tt>make</tt> to build them, but
<!-------------------------------------------------------------------------> can otherwise be used freely. To build the entire LLVM system, just
enter the top level <tt>llvm</tt> directory and type <tt>gmake</tt>.
<p>Every directory in the LLVM source tree includes a <tt>Makefile</tt> to A few minutes later you will hopefully have a freshly compiled toolchain
build it, and any subdirectories that it contains. These makefiles require waiting for you in <tt><i>OBJ_ROOT</i></tt><tt>/llvm/tools/Debug</tt>.
that you use <tt>gmake</tt>, instead of <tt>make</tt> to build them, but can If you want to look at the libraries that were compiled, look in <tt><i>OBJ_ROOT</i></tt><tt>/llvm/lib/Debug</tt>.</p>
otherwise be used freely. To build the entire LLVM system, just enter the If you get an error about the <tt>/localhome</tt> directory, chances
top level <tt>llvm</tt> directory and type <tt>gmake</tt>. A few minutes are good that something has been misconfigured. &nbsp;Follow the instructions
later you will hopefully have a freshly compiled toolchain waiting for you in the section about <a href="#environment">Setting Up Your Environment.</a>
in <tt>llvm/tools/Debug</tt>. If you want to look at the libraries that <!--=====================================================================-->
were compiled, look in <tt>llvm/lib/Debug</tt>.</p>
<center>
If you get an error talking about a <tt>/localhome</tt> directory, follow <h2><a name="layout"><b>Program Layout</b></a></h2>
the instructions in the section about <a href="#environment">Setting Up Your </center>
Environment.</a> <!--=====================================================================-->
<p>One useful source of infomation about the LLVM sourcebase is the LLVM
<a href="http://www.doxygen.org">doxygen</a> documentation, available at
<!--=====================================================================--> <tt><a href="http://llvm.cs.uiuc.edu/doxygen/">http://llvm.cs.uiuc.edu/doxygen/</a></tt>.
<center> The following is a brief introduction to code layout:</p>
<h2><a name="layout"><b>Program Layout</b></a></h2> <!------------------------------------------------------------------------->
</center>
<!--=====================================================================--> <h3><a name="cvsdir"><tt>CVS</tt> directories</a></h3>
<!------------------------------------------------------------------------->
<p>One useful source of infomation about the LLVM sourcebase is the LLVM <a Every directory checked out of CVS will contain a <tt>CVS</tt> directory;
href="http://www.doxygen.org">doxygen</a> documentation, available at <tt><a for the most part, these can just be ignored. <!------------------------------------------------------------------------->
href="http://llvm.cs.uiuc.edu/doxygen/">http://llvm.cs.uiuc.edu/doxygen/</a></tt>. The
following is a brief introduction to code layout:</p> <h3><a name="ddr"><tt>Depend</tt>, <tt>Debug</tt>, &amp; <tt>Release</tt>
<!------------------------------------------------------------------------->
<h3><a name="cvsdir"><tt>CVS</tt> directories</a></h3>
<!------------------------------------------------------------------------->
Every directory checked out of CVS will contain a <tt>CVS</tt> directory,
for the most part these can just be ignored.
<!------------------------------------------------------------------------->
<h3><a name="ddr"><tt>Depend</tt>, <tt>Debug</tt>, &amp; <tt>Release</tt>
directories</a></h3> directories</a></h3>
<!-------------------------------------------------------------------------> <!------------------------------------------------------------------------->
If you are building with the "<tt>OBJ_ROOT=.</tt>" option enabled in
If you are building with the "<tt>BUILD_ROOT=.</tt>" option enabled in the the <tt>Makefile.config</tt> file, most source directories will contain
<tt>Makefile.common</tt> file, most source directories will contain two two directories, <tt>Depend</tt> and <tt>Debug</tt>. The <tt>Depend</tt>
directories, <tt>Depend</tt> and <tt>Debug</tt>. The <tt>Depend</tt> directory contains automatically generated dependance files which are
directory contains automatically generated dependance files which are used used during compilation to make sure that source files get rebuilt if
during compilation to make sure that source files get rebuilt if a header a header file they use is modified. The <tt>Debug</tt> directory holds
file they use is modified. The <tt>Debug</tt> directory holds the object the object files, library files, and executables that are used for building
files, library files and executables that are used for building a debug a debug enabled build. The <tt>Release</tt> directory is created to
enabled build. The <tt>Release</tt> directory is created to hold the same hold the same files when the <tt>ENABLE_OPTIMIZED=1</tt> flag is passed
files when the <tt>ENABLE_OPTIMIZED=1</tt> flag is passed to <tt>gmake</tt>, to <tt>gmake</tt>, causing an optimized built to be performed.
causing an optimized built to be performed.<p> <p> <!------------------------------------------------------------------------->
</p>
<h3><a name="include"><tt>llvm/include</tt></a></h3>
<!-------------------------------------------------------------------------> <!------------------------------------------------------------------------->
<h3><a name="include"><tt>llvm/include</tt></a></h3> This directory contains public header files exported from the LLVM
<!-------------------------------------------------------------------------> library. The two main subdirectories of this directory are:
<p> </p>
This directory contains public header files exported from the LLVM <ol>
library. The two main subdirectories of this directory are:<p> <li><tt>llvm/include/llvm</tt> - This directory contains all of the
LLVM specific header files. This directory also has subdirectories
<ol> for different portions of LLVM: <tt>Analysis</tt>, <tt>CodeGen</tt>,
<li><tt>llvm/include/llvm</tt> - This directory contains all of the LLVM <tt>Reoptimizer</tt>, <tt>Target</tt>, <tt>Transforms</tt>, etc...
specific header files. This directory also has subdirectories for </li>
different portions of LLVM: <tt>Analysis</tt>, <tt>CodeGen</tt>, <li><tt>llvm/include/Support</tt> - This directory contains generic
<tt>Reoptimizer</tt>, <tt>Target</tt>, <tt>Transforms</tt>, etc... support libraries that are independant of LLVM, but are used by LLVM.
For example, some C++ STL utilities and a Command Line option processing
<li><tt>llvm/include/Support</tt> - This directory contains generic library. </li>
support libraries that are independant of LLVM, but are used by LLVM. </ol>
For example, some C++ STL utilities and a Command Line option processing <!------------------------------------------------------------------------->
library.
</ol> <h3><a name="lib"><tt>llvm/lib</tt></a></h3>
<!------------------------------------------------------------------------->
<!-------------------------------------------------------------------------> This directory contains most source files of LLVM system. In LLVM almost
<h3><a name="lib"><tt>llvm/lib</tt></a></h3> all code exists in libraries, making it very easy to share code among
<!-------------------------------------------------------------------------> the different <a href="#tools">tools</a>.
<p> </p>
This directory contains most source files of LLVM system. In LLVM almost all <dl compact="compact">
code exists in libraries, making it very easy to share code among the <dt><tt>llvm/lib/VMCore/</tt></dt>
different <a href="#tools">tools</a>.<p> <dd> This directory holds the core LLVM source files that implement
core classes like Instruction and BasicBlock. </dd>
<dl compact> <dt><tt>llvm/lib/AsmParser/</tt></dt>
<dt><tt>llvm/lib/VMCore/</tt><dd> This directory holds the core LLVM <dd> This directory holds the source code for the LLVM assembly language
source files that implement core classes like Instruction and BasicBlock. parser library. </dd>
<dt><tt>llvm/lib/ByteCode/</tt></dt>
<dt><tt>llvm/lib/AsmParser/</tt><dd> This directory holds the source code <dd> This directory holds code for reading and write LLVM bytecode.
for the LLVM assembly language parser library. </dd>
<dt><tt>llvm/lib/CWriter/</tt></dt>
<dt><tt>llvm/lib/ByteCode/</tt><dd> This directory holds code for reading <dd> This directory implements the LLVM to C converter. </dd>
and write LLVM bytecode. <dt><tt>llvm/lib/Analysis/</tt></dt>
<dd> This directory contains a variety of different program analyses,
<dt><tt>llvm/lib/CWriter/</tt><dd> This directory implements the LLVM to C such as Dominator Information, Call Graphs, Induction Variables, Interval
converter. Identification, Natural Loop Identification, etc... </dd>
<dt><tt>llvm/lib/Transforms/</tt></dt>
<dt><tt>llvm/lib/Analysis/</tt><dd> This directory contains a variety of <dd> This directory contains the source code for the LLVM to LLVM
different program analyses, such as Dominator Information, Call Graphs, program transformations, such as Aggressive Dead Code Elimination,
Induction Variables, Interval Identification, Natural Loop Identification, Sparse Conditional Constant Propagation, Inlining, Loop Invarient Code
etc... Motion, Dead Global Elimination, Pool Allocation, and many others...
</dd>
<dt><tt>llvm/lib/Transforms/</tt><dd> This directory contains the source <dt><tt>llvm/lib/Target/</tt></dt>
code for the LLVM to LLVM program transformations, such as Aggressive Dead <dd> This directory contains files that describe various target architectures
Code Elimination, Sparse Conditional Constant Propagation, Inlining, Loop for code generation. For example, the llvm/lib/Target/Sparc directory
Invarient Code Motion, Dead Global Elimination, Pool Allocation, and many holds the Sparc machine description.<br>
others... </dd>
<dt><tt>llvm/lib/CodeGen/</tt></dt>
<dt><tt>llvm/lib/Target/</tt><dd> This directory contains files that <dd> This directory contains the major parts of the code generator:
describe various target architectures for code generation. For example, Instruction Selector, Instruction Scheduling, and Register Allocation.
the llvm/lib/Target/Sparc directory holds the Sparc machine </dd>
description.<br> <dt><tt>llvm/lib/Reoptimizer/</tt></dt>
<dd> This directory holds code related to the runtime reoptimizer
<dt><tt>llvm/lib/CodeGen/</tt><dd> This directory contains the major parts framework that is currently under development. </dd>
of the code generator: Instruction Selector, Instruction Scheduling, and <dt><tt>llvm/lib/Support/</tt></dt>
Register Allocation. <dd> This directory contains the source code that corresponds to
the header files located in <tt>llvm/include/Support/</tt>. </dd>
<dt><tt>llvm/lib/Reoptimizer/</tt><dd> This directory holds code related </dl>
to the runtime reoptimizer framework that is currently under development. <!------------------------------------------------------------------------->
<dt><tt>llvm/lib/Support/</tt><dd> This directory contains the source code <h3><a name="test"><tt>llvm/test</tt></a></h3>
that corresponds to the header files located in <!------------------------------------------------------------------------->
<tt>llvm/include/Support/</tt>.
</dl> <p>This directory contains regression tests and source code that is used
to test the LLVM infrastructure...</p>
<!-------------------------------------------------------------------------> <!------------------------------------------------------------------------->
<h3><a name="test"><tt>llvm/test</tt></a></h3>
<!-------------------------------------------------------------------------> <h3><a name="tools"><tt>llvm/tools</tt></a></h3>
<!------------------------------------------------------------------------->
<p>This directory contains regression tests and source code that is used to
test the LLVM infrastructure...</p> <p>The <b>tools</b> directory contains the executables built out of the
libraries above, which form the main part of the user interface. You
<!-------------------------------------------------------------------------> can always get help for a tool by typing <tt>tool_name --help</tt>.
<h3><a name="tools"><tt>llvm/tools</tt></a></h3> The following is a brief introduction to the most important tools.</p>
<!------------------------------------------------------------------------->
<p>The <b>tools</b> directory contains the executables built out of the
libraries above, which form the main part of the user interface. You can
always get help for a tool by typing <tt>tool_name --help</tt>. The
following is a brief introduction to the most important tools.</p>
<dl compact>
<dt><tt><b>as</b></tt><dd>The assembler transforms the human readable
LLVM assembly to LLVM bytecode.<p>
<dt><tt><b>dis</b></tt><dd>The disassembler transforms the LLVM bytecode
to human readable LLVM assembly. Additionally it can convert LLVM
bytecode to C, which is enabled with the <tt>-c</tt> option.<p>
<dt><tt><b>lli</b></tt><dd> <tt>lli</tt> is the LLVM interpreter, which
can directly execute LLVM bytecode (although very slowly...). In addition
to a simple intepreter, <tt>lli</tt> is also has debugger and tracing
modes (entered by specifying <tt>-debug</tt> or <tt>-trace</tt> on the
command line, respectively).<p>
<dt><tt><b>llc</b></tt><dd> <tt>llc</tt> is the LLVM backend compiler,
which translates LLVM bytecode to a SPARC assembly file.<p>
<dt><tt><b>llvmgcc</b></tt><dd> <tt>llvmgcc</tt> is a GCC based C frontend
that has been retargeted to emit LLVM code as the machine code output. It
works just like any other GCC compiler, taking the typical <tt>-c, -S, -E,
-o</tt> options that are typically used. The source code for the
<tt>llvmgcc</tt> tool is currently not included in the LLVM cvs tree
because it is quite large and not very interesting.<p>
<ol>
<dt><tt><b>gccas</b></tt><dd> This tool is invoked by the
<tt>llvmgcc</tt> frontend as the "assembler" part of the compiler. This
tool actually assembles LLVM assembly to LLVM bytecode,
performs a variety of optimizations,
and outputs LLVM bytecode. Thus when you invoke <tt>llvmgcc -c x.c -o
x.o</tt>, you are causing <tt>gccas</tt> to be run, which writes the
<tt>x.o</tt> file (which is an LLVM bytecode file that can be
disassembled or manipulated just like any other bytecode file). The
command line interface to <tt>gccas</tt> is designed to be as close as
possible to the <b>system</b> '<tt>as</tt>' utility so that the gcc
frontend itself did not have to be modified to interface to a "wierd"
assembler.<p>
<dt><tt><b>gccld</b></tt><dd> <tt>gccld</tt> links together several LLVM
bytecode files into one bytecode file and does some optimization. It is
the linker invoked by the gcc frontend when multiple .o files need to be
linked together. Like <tt>gccas</tt> the command line interface of
<tt>gccld</tt> is designed to match the system linker, to aid
interfacing with the GCC frontend.<p>
</ol>
<dt><tt><b>opt</b></tt><dd> <tt>opt</tt> reads LLVM bytecode, applies a
series of LLVM to LLVM transformations (which are specified on the command
line), and then outputs the resultant bytecode. The '<tt>opt --help</tt>'
command is a good way to get a list of the program transformations
available in LLVM.<p>
<dt><tt><b>analyze</b></tt><dd> <tt>analyze</tt> is used to run a specific
analysis on an input LLVM bytecode file and print out the results. It is
primarily useful for debugging analyses, or familiarizing yourself with
what an analysis does.<p>
</dl>
<!--=====================================================================-->
<h2><a name="tutorial">An example using the LLVM tool chain</h2>
<!--=====================================================================-->
<ol>
<li>First, create a simple C file, name it 'hello.c':
<pre>
#include &lt;stdio.h&gt;
int main() {
printf("hello world\n");
return 0;
}
</pre>
<li>Next, compile the C file into a LLVM bytecode file:<p>
<tt>% llvmgcc hello.c -o hello</tt><p>
This will create two result files: <tt>hello</tt> and
<tt>hello.bc</tt>. The <tt>hello.bc</tt> is the LLVM bytecode that
corresponds the the compiled program and the library facilities that it
required. <tt>hello</tt> is a simple shell script that runs the bytecode
file with <tt>lli</tt>, making the result directly executable.<p>
<li>Run the program. To make sure the program ran, execute one of the
following commands:<p>
<tt>% ./hello</tt><p> <dl compact="compact">
<dt><tt><b>as</b></tt></dt>
or<p> <dd>The assembler transforms the human readable LLVM assembly to
LLVM bytecode.
<tt>% lli hello.bc</tt><p> <p> </p>
</dd>
<li>Use the <tt>dis</tt> utility to take a look at the LLVM assembly <dt><tt><b>dis</b></tt></dt>
code:<p> <dd>The disassembler transforms the LLVM bytecode to human readable
LLVM assembly. Additionally it can convert LLVM bytecode to C, which
<tt>% dis < hello.bc | less</tt><p> is enabled with the <tt>-c</tt> option.
<p> </p>
<li>Compile the program to native Sparc assembly using the code </dd>
generator:<p> <dt><tt><b>lli</b></tt></dt>
<dd> <tt>lli</tt> is the LLVM interpreter, which can directly execute
<tt>% llc hello.bc -o hello.s</tt><p> LLVM bytecode (although very slowly...). In addition to a simple intepreter,
<tt>lli</tt> is also has debugger and tracing modes (entered by
<li>Assemble the native sparc assemble file into a program:<p> specifying <tt>-debug</tt> or <tt>-trace</tt> on the command line,
respectively).
<tt>% /opt/SUNWspro/bin/cc -xarch=v9 hello.s -o hello.sparc</tt><p> <p> </p>
</dd>
<li>Execute the native sparc program:<p> <dt><tt><b>llc</b></tt></dt>
<dd> <tt>llc</tt> is the LLVM backend compiler, which translates
<tt>% ./hello.sparc</tt><p> LLVM bytecode to a SPARC assembly file.
<p> </p>
</dd>
<dt><tt><b>llvmgcc</b></tt></dt>
<dd> <tt>llvmgcc</tt> is a GCC based C frontend that has been retargeted
to emit LLVM code as the machine code output. It works just like any
other GCC compiler, taking the typical <tt>-c, -S, -E, -o</tt> options
that are typically used. The source code for the <tt>llvmgcc</tt>
tool is currently not included in the LLVM cvs tree because it is quite
large and not very interesting.
<p> </p>
<ol>
<dt><tt><b>gccas</b></tt></dt>
<dd> This tool is invoked by the <tt>llvmgcc</tt> frontend
as the "assembler" part of the compiler. This tool actually assembles
LLVM assembly to LLVM bytecode, performs a variety of optimizations,
and outputs LLVM bytecode. Thus when you invoke <tt>llvmgcc -c x.c
-o x.o</tt>, you are causing <tt>gccas</tt> to be run, which writes
the <tt>x.o</tt> file (which is an LLVM bytecode file that can be
disassembled or manipulated just like any other bytecode file).
The command line interface to <tt>gccas</tt> is designed to be as
close as possible to the <b>system</b> '<tt>as</tt>' utility so that
the gcc frontend itself did not have to be modified to interface
to a "wierd" assembler.
<p> </p>
</dd>
<dt><tt><b>gccld</b></tt></dt>
<dd> <tt>gccld</tt> links together several LLVM bytecode files
into one bytecode file and does some optimization. It is the linker
invoked by the gcc frontend when multiple .o files need to be linked
together. Like <tt>gccas</tt> the command line interface of <tt>gccld</tt>
is designed to match the system linker, to aid interfacing with the
GCC frontend.
<p> </p>
</dd>
</ol> </ol>
</dd>
<dt><tt><b>opt</b></tt></dt>
<!--=====================================================================--> <dd> <tt>opt</tt> reads LLVM bytecode, applies a series of LLVM to
<h2><a name="links">Links</a></h2> LLVM transformations (which are specified on the command line), and
<!--=====================================================================--> then outputs the resultant bytecode. The '<tt>opt --help</tt>' command
is a good way to get a list of the program transformations available
<p>This document is just an <b>introduction</b> to how to use LLVM to do in LLVM.
some simple things... there are many more interesting and complicated things <p> </p>
that you can do that aren't documented here (but we'll gladly accept a patch </dd>
if you want to write something up!). For more information about LLVM, check <dt><tt><b>analyze</b></tt></dt>
out:</p> <dd> <tt>analyze</tt> is used to run a specific analysis on an input
LLVM bytecode file and print out the results. It is primarily useful
<ul> for debugging analyses, or familiarizing yourself with what an analysis
<li><a href="http://llvm.cs.uiuc.edu/">LLVM homepage</a></li> does.
<li><a href="http://llvm.cs.uiuc.edu/doxygen/">LLVM doxygen tree</a></li> <p> </p>
</ul> </dd>
</dl>
<hr> <!--=====================================================================-->
If you have any questions or run into any snags (or you have any <h2><a name="tutorial">An example using the LLVM tool chain</a></h2>
additions...), please send an email to <a name="tutorial"> <!--=====================================================================-->
<a href="mailto:sabre@nondot.org">Chris Lattner</a>.</p> </a>
<ol>
<!-- Created: Mon Jul 1 02:29:02 CDT 2002 --> <a name="tutorial"> <li>First, create a simple C file, name it 'hello.c':
<!-- hhmts start -->
Last modified: Tue Jun 3 22:06:43 CDT 2003 <pre> #include &lt;stdio.h&gt;<br> int main() {<br> printf("hello world\n");<br> return 0;<br> }<br> </pre>
<!-- hhmts end --> </li>
</body> <li>Next, compile the C file into a LLVM bytecode file:
<p> <tt>% llvmgcc hello.c -o hello</tt></p>
<p> This will create two result files: <tt>hello</tt> and
<tt>hello.bc</tt>. The <tt>hello.bc</tt> is the LLVM bytecode that
corresponds the the compiled program and the library facilities that it
required. <tt>hello</tt> is a simple shell script that runs the bytecode
file with <tt>lli</tt>, making the result directly executable.</p>
<p> </p>
</li>
<li>Run the program. To make sure the program ran, execute one of the
following commands:
<p> <tt>% ./hello</tt></p>
<p> or</p>
<p> <tt>% lli hello.bc</tt></p>
<p> </p>
</li>
<li>Use the <tt>dis</tt> utility to take a look at the LLVM assembly
code:
<p> <tt>% dis &lt; hello.bc | less</tt></p>
<p> </p>
</li>
<li>Compile the program to native Sparc assembly using the code generator:
<p> <tt>% llc hello.bc -o hello.s</tt></p>
<p> </p>
</li>
<li>Assemble the native sparc assemble file into a program:
<p> <tt>% /opt/SUNWspro/bin/cc -xarch=v9 hello.s -o hello.sparc</tt></p>
<p> </p>
</li>
<li>Execute the native sparc program:
<p> <tt>% ./hello.sparc</tt></p>
<p> </p>
</li>
</a>
</ol>
<a name="tutorial"> <!--=====================================================================-->
</a>
<h2><a name="links">Links</a></h2>
<!--=====================================================================-->
<p>This document is just an <b>introduction</b> to how to use LLVM to do
some simple things... there are many more interesting and complicated
things that you can do that aren't documented here (but we'll gladly
accept a patch if you want to write something up!). For more information
about LLVM, check out:</p>
<ul>
<li><a href="http://llvm.cs.uiuc.edu/">LLVM homepage</a></li>
<li><a href="http://llvm.cs.uiuc.edu/doxygen/">LLVM doxygen tree</a></li>
</ul>
<hr> If you have any questions or run into any snags (or you have any
additions...), please send an email to <a
href="mailto:sabre@nondot.org">Chris Lattner</a>.
<p></p>
<!-- Created: Mon Jul 1 02:29:02 CDT 2002 --> <!-- hhmts start -->
Last modified: Tue Jun 3 22:06:43 CDT 2003 <!-- hhmts end --> <br>
</body>
</html> </html>