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|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Using The LLVM Libraries</title>
<link rel="stylesheet" href="llvm.css" type="text/css">
</head>
<body>
<div class="doc_title">Using The LLVM Libraries</div>
<ol>
<li><a href="#abstract">Abstract</a></li>
<li><a href="#introduction">Introduction</a></li>
<li><a href="#descriptions">Library Descriptions</a></li>
<li><a href="#dependencies">Library Dependencies</a></li>
<li><a href="#rot">Linkage Rules Of Thumb</a>
<ol>
<li><a href="#always">Always link LLVMCore, LLVMSupport, LLVMSystem</a>
<li><a href="#onlyone">Never link both archive and re-linked</a>
</ol>
</li>
</ol>
<div class="doc_author">
<p>Written by <a href="mailto:rspencer@x10sys.com">Reid Spencer</a></p>
</div>
<!-- ======================================================================= -->
<div class="doc_section"><a name="abstract">Abstract</a></div>
<div class="doc_text">
<p>Amongst other things, LLVM is a toolkit for building compilers, linkers,
runtime executives, virtual machines, and other program execution related
tools. In addition to the LLVM tool set, the functionality of LLVM is
available through a set of libraries. To use LLVM as a toolkit for
constructing tools, a developer needs to understand what is contained in the
various libraries, what they depend on, and how to use them. This document
describes the contents of the libraries and how and when to use them.
</p>
</div>
<!-- ======================================================================= -->
<div class="doc_section"> <a name="introduction">Introduction</a></div>
<div class="doc_text">
<p>If you're writing a compiler, virtual machine, or any other utility based
on LLVM, you'll need to figure out which of the many libraries files you will
need to link with to be successful. An understanding of the contents of these
files and their inter-relationships will be useful in coming up with an optimal
specification for the libraries to link with. The purpose of this document is
to reduce some of the trial and error that the author experienced in using
LLVM.</p>
<p>LLVM produces two types of libraries: archives (ending in <tt>.a</tt>) and
objects (ending in <tt>.o</tt>). However, both are libraries. Libraries ending
in <tt>.o</tt> are known as re-linked libraries because they contain all the
compilation units of the library linked together as a single <tt>.o</tt> file.
Furthermore, many of the libraries have <em>both</em> forms of library. The
re-linked libraries are used whenever you want to include all symbols from the
library. The archive libraries are used whenever you want to only resolve
outstanding symbols at that point in the link without including everything in
the library. </p>
<p>When linking your tools, you will use the <tt>LLVMLIBS</tt> make variable.
(see the <a href="MakefileGuide.html#LLVMLIBS">Makefile Guide</a> for
details). This variable specifies which LLVM libraries to link into your tool
and the order in which they will be linked. You specify re-linked libraries by
naming the library without a suffix. You specify archive libraries by naming
the library with a <tt>.a</tt> suffix but without the <tt>lib</tt> prefix. The
order in which the libraries appear in the <tt>LLVMLIBS</tt> variable
definition is the order in which they will be linked. Getting this order
correct for your tool can sometimes be challenging.
</div>
<!-- ======================================================================= -->
<div class="doc_section"><a name="descriptions"></a>Library Descriptions</div>
<div class="doc_text">
<p>The table below categorizes each library
<table style="text-align:left">
<tr><th>Library</th><th>Forms</th><th>Description</th></tr>
<tr><th colspan="3">Core Libraries</th></tr>
<tr><td>LLVMAsmParser</td><td><tt>.o</tt></td>
<td>LLVM Assembly Parsing</td></tr>
<tr><td>LLVMBCReader</td><td><tt>.o</tt></td>
<td>LLVM Bytecode Reading</td></tr>
<tr><td>LLVMBCWriter</td><td><tt>.o</tt></td>
<td>LLVM Bytecode Writing</td></tr>
<tr><td>LLVMDebugger</td><td><tt>.o</tt></td>
<td>Source Level Debugging Support</td></tr>
<tr><td>LLVMSupport</td><td><tt>.a .o</tt></td>
<td>General support utilities</td></tr>
<tr><td>LLVMSystem</td><td><tt>.a .o</tt></td>
<td>Operating system abstraction</td></tr>
<tr><td>LLVMCore</td><td><tt>.o</tt></td>
<td>LLVM Core IR</td></tr>
<tr><th colspan="3">Analysis Libraries</th></tr>
<tr><td>LLVMAnalysis</td><td><tt>.a .o</tt></td>
<td>Various analysis passes.</td></tr>
<tr><td>LLVMDataStructure</td><td><tt>.a .o</tt></td>
<td>Data structure analysis passes.</td></tr>
<tr><td>LLVMipa</td><td><tt>.a .o</tt></td>
<td>Inter-procedural analysis passes.</td></tr>
<tr><th colspan="3">Transformation Libraries</th></tr>
<tr><td>LLVMInstrumentation</td><td><tt>.a .o</tt></td>
<td>Instrumentation passes.</td></tr>
<tr><td>LLVMipo</td><td><tt>.a .o</tt></td>
<td>All inter-procedural optimization passes.</td></tr>
<tr><td>LLVMScalarOpts</td><td><tt>.a .o</tt></td>
<td>All scalar optimization passes.</td></tr>
<tr><td>LLVMTransforms</td><td><tt>.a .o</tt></td>
<td>Uncategorized transformation passes.</td></tr>
<tr><td>LLVMTransformUtils</td><td><tt>.a .o</tt></td>
<td>Transformation utilities.</td></tr>
<tr><td>LLVMProfilePaths</td><td><tt>.o</tt></td>
<td>Profile paths for instrumentation.</td></tr>
<tr><th colspan="3">Code Generation Libraries </th></tr>
<tr><td>LLVMCodeGen</td><td><tt>.o</tt></td>
<td>Native code generation infrastructure</td></tr>
<tr><th colspan="3">Target Libraries</th></tr>
<tr><td>LLVMCBackend</td><td><tt>.o</tt></td>
<td>'C' language code generator.</td></tr>
<tr><td>LLVMPowerPC</td><td><tt>.o</tt></td>
<td>PowerPC code generation backend</td></tr>
<tr><td>LLVMSelectionDAG</td><td><tt>.o</tt></td>
<td>Aggressive instruction selector for Directed Acyclic Graphs.</td></tr>
<tr><td>LLVMSkeleton</td><td><tt>.a .o</tt></td>
<td>Skeleton for a code generation backend.</td></tr>
<tr><td>LLVMSparcV9</td><td><tt>.o</tt></td>
<td>Code generation for SparcV9.</td></tr>
<tr><td>LLVMSparcV9RegAlloc</td><td><tt>.a .o</tt></td>
<td>Graph-coloring register allocator for SparcV9.</td></tr>
<tr><td>LLVMSparcV9InstrSched</td><td><tt>.o</tt></td>
<td>Instruction scheduling for SparcV9.</td></tr>
<tr><td>LLVMSparcV9LiveVar</td><td><tt>.o</tt></td>
<td>Live variable analysis SparcV9.</td></tr>
<tr><td>LLVMSparcV9ModuloSched</td><td><tt>.o</tt></td>
<td>Modulo scheduling for SparcV9.</td></tr>
<tr><td>LLVMTarget</td><td><tt>.a .o</tt></td>
<td>Generic code generation utilities.</td></tr>
<tr><td>LLVMX86</td><td><tt>.o</tt></td>
<td>Intel x86 code generation backend</td></tr>
<tr><th colspan="3">Runtime Libraries</th></tr>
<tr><td>LLVMInterpreter</td><td><tt>.o</tt></td>
<td>Bytecode Interpreter</td></tr>
<tr><td>LLVMJIT</td><td><tt>.o</tt></td>
<td>Bytecode JIT Compiler</td></tr>
<tr><td>LLVMExecutionEngine</td><td><tt>.o</tt></td>
<td>Virtual machine engine</td></tr>
<tr><td>LLVMexecve</td><td><tt>.o</tt></td>
<td>execve(2) replacement for llee</td></tr>
</table>
</div>
<!-- ======================================================================= -->
<div class="doc_section"><a name="dependencies"></a>Library Dependencies</div>
<div class="doc_text">
<p>The following list shows the dependency relationships between libraries.
This information can be automatically generated with the
<tt>GenLibDeps.pl</tt> utility in the <tt>llvm/utils</tt> directory.</p>
<!-- =======NOTE: =========================================================-->
<!-- === The following <dl> list is generated automatically by the util ===-->
<!-- === named GenLibDeps.pl in the llvm/utils directory. This should ===-->
<!-- === updated whenever new libraries are added, removed, or changed ===-->
<!-- =======NOTE: =========================================================-->
<dl>
<dt><b>libLLVMAnalysis.a</b</dt><dd><ul>
<li>libLLVMScalarOpts.a</li>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>libLLVMTransformUtils.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>libLLVMArchive.a</b</dt><dd><ul>
<li>libLLVMSupport.a</li>
<li>libLLVMSystem.a</li>
<li>LLVMBCReader.o</li>
</ul></dd>
<dt><b>libLLVMDataStructure.a</b</dt><dd><ul>
<li>libLLVMAnalysis.a</li>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>libLLVMTransformUtils.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>libLLVMInstrumentation.a</b</dt><dd><ul>
<li>libLLVMSupport.a</li>
<li>libLLVMTransformUtils.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>libLLVMLinker.a</b</dt><dd><ul>
<li>libLLVMArchive.a</li>
<li>libLLVMSystem.a</li>
<li>LLVMBCReader.o</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>libLLVMScalarOpts.a</b</dt><dd><ul>
<li>libLLVMAnalysis.a</li>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>libLLVMTransformUtils.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>libLLVMSparcV9RegAlloc.a</b</dt><dd><ul>
<li>libLLVMAnalysis.a</li>
<li>libLLVMSupport.a</li>
<li>LLVMCodeGen.o</li>
<li>LLVMCore.o</li>
<li>LLVMSparcV9LiveVar.o</li>
<li>LLVMSparcV9.o</li>
</ul></dd>
<dt><b>libLLVMSupport.a</b</dt><dd><ul>
<li>libLLVMSystem.a</li>
<li>LLVMbzip2.o</li>
</ul></dd>
<dt><b>libLLVMSystem.a</b</dt><dd><ul>
</ul></dd>
<dt><b>libLLVMTarget.a</b</dt><dd><ul>
<li>libLLVMSupport.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>libLLVMTransformUtils.a</b</dt><dd><ul>
<li>libLLVMAnalysis.a</li>
<li>libLLVMScalarOpts.a</li>
<li>libLLVMSupport.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>libLLVMTransforms.a</b</dt><dd><ul>
<li>libLLVMAnalysis.a</li>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>libLLVMTransformUtils.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>libLLVMipa.a</b</dt><dd><ul>
<li>libLLVMAnalysis.a</li>
<li>libLLVMSupport.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>libLLVMipo.a</b</dt><dd><ul>
<li>libLLVMAnalysis.a</li>
<li>libLLVMipa.a</li>
<li>libLLVMScalarOpts.a</li>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>libLLVMTransformUtils.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMAnalysis.o</b</dt><dd><ul>
<li>libLLVMScalarOpts.a</li>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>libLLVMTransformUtils.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMAsmParser.o</b</dt><dd><ul>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMBCReader.o</b</dt><dd><ul>
<li>libLLVMSupport.a</li>
<li>libLLVMSystem.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMBCWriter.o</b</dt><dd><ul>
<li>libLLVMSupport.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMCBackend.o</b</dt><dd><ul>
<li>libLLVMAnalysis.a</li>
<li>libLLVMipa.a</li>
<li>libLLVMScalarOpts.a</li>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMCodeGen.o</b</dt><dd><ul>
<li>libLLVMAnalysis.a</li>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMCore.o</b</dt><dd><ul>
<li>libLLVMSupport.a</li>
</ul></dd>
<dt><b>LLVMDataStructure.o</b</dt><dd><ul>
<li>libLLVMAnalysis.a</li>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>libLLVMTransformUtils.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMDebugger.o</b</dt><dd><ul>
<li>libLLVMSupport.a</li>
<li>libLLVMSystem.a</li>
<li>LLVMBCReader.o</li>
<li>LLVMCodeGen.o</li>
<li>LLVMCore.o</li>
<li>LLVMExecutionEngine.o</li>
</ul></dd>
<dt><b>LLVMExecutionEngine.o</b</dt><dd><ul>
<li>libLLVMSupport.a</li>
<li>libLLVMSystem.a</li>
<li>libLLVMTarget.a</li>
<li>LLVMCore.o</li>
<li>LLVMInterpreter.o</li>
<li>LLVMJIT.o</li>
</ul></dd>
<dt><b>LLVMInstrumentation.o</b</dt><dd><ul>
<li>libLLVMSupport.a</li>
<li>libLLVMTransformUtils.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMInterpreter.o</b</dt><dd><ul>
<li>libLLVMSupport.a</li>
<li>libLLVMSystem.a</li>
<li>libLLVMTarget.a</li>
<li>LLVMCore.o</li>
<li>LLVMExecutionEngine.o</li>
</ul></dd>
<dt><b>LLVMJIT.o</b</dt><dd><ul>
<li>libLLVMSupport.a</li>
<li>libLLVMSystem.a</li>
<li>libLLVMTarget.a</li>
<li>LLVMCore.o</li>
<li>LLVMExecutionEngine.o</li>
</ul></dd>
<dt><b>LLVMPowerPC.o</b</dt><dd><ul>
<li>libLLVMScalarOpts.a</li>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>LLVMCodeGen.o</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMProfilePaths.o</b</dt><dd><ul>
<li>libLLVMInstrumentation.a</li>
<li>libLLVMSupport.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMScalarOpts.o</b</dt><dd><ul>
<li>libLLVMAnalysis.a</li>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>libLLVMTransformUtils.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMSelectionDAG.o</b</dt><dd><ul>
<li>LLVMCodeGen.o</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMSkeleton.o</b</dt><dd><ul>
<li>libLLVMTarget.a</li>
<li>LLVMCodeGen.o</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMSparcV8.o</b</dt><dd><ul>
<li>libLLVMScalarOpts.a</li>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>LLVMCodeGen.o</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMSparcV9.o</b</dt><dd><ul>
<li>libLLVMScalarOpts.a</li>
<li>libLLVMSparcV9RegAlloc.a</li>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>LLVMBCWriter.o</li>
<li>LLVMCodeGen.o</li>
<li>LLVMCore.o</li>
<li>LLVMSparcV9InstrSched.o</li>
<li>LLVMSparcV9ModuloSched.o</li>
</ul></dd>
<dt><b>LLVMSparcV9InstrSched.o</b</dt><dd><ul>
<li>libLLVMSupport.a</li>
<li>LLVMCodeGen.o</li>
<li>LLVMCore.o</li>
<li>LLVMSparcV9LiveVar.o</li>
<li>LLVMSparcV9.o</li>
</ul></dd>
<dt><b>LLVMSparcV9LiveVar.o</b</dt><dd><ul>
<li>libLLVMSupport.a</li>
<li>LLVMCodeGen.o</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMSparcV9ModuloSched.o</b</dt><dd><ul>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>LLVMCodeGen.o</li>
<li>LLVMCore.o</li>
<li>LLVMSparcV9.o</li>
</ul></dd>
<dt><b>LLVMSparcV9RegAlloc.o</b</dt><dd><ul>
<li>libLLVMAnalysis.a</li>
<li>libLLVMSupport.a</li>
<li>LLVMCodeGen.o</li>
<li>LLVMCore.o</li>
<li>LLVMSparcV9LiveVar.o</li>
<li>LLVMSparcV9.o</li>
</ul></dd>
<dt><b>LLVMSupport.o</b</dt><dd><ul>
<li>libLLVMSystem.a</li>
<li>LLVMbzip2.o</li>
</ul></dd>
<dt><b>LLVMSystem.o</b</dt><dd><ul>
</ul></dd>
<dt><b>LLVMTarget.o</b</dt><dd><ul>
<li>libLLVMSupport.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMTransformUtils.o</b</dt><dd><ul>
<li>libLLVMAnalysis.a</li>
<li>libLLVMScalarOpts.a</li>
<li>libLLVMSupport.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMTransforms.o</b</dt><dd><ul>
<li>libLLVMAnalysis.a</li>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>libLLVMTransformUtils.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMX86.o</b</dt><dd><ul>
<li>libLLVMScalarOpts.a</li>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>LLVMCodeGen.o</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMbzip2.o</b</dt><dd><ul>
</ul></dd>
<dt><b>LLVMipa.o</b</dt><dd><ul>
<li>libLLVMAnalysis.a</li>
<li>libLLVMSupport.a</li>
<li>LLVMCore.o</li>
</ul></dd>
<dt><b>LLVMipo.o</b</dt><dd><ul>
<li>libLLVMAnalysis.a</li>
<li>libLLVMipa.a</li>
<li>libLLVMScalarOpts.a</li>
<li>libLLVMSupport.a</li>
<li>libLLVMTarget.a</li>
<li>libLLVMTransformUtils.a</li>
<li>LLVMCore.o</li>
</ul></dd>
</dl>
</div>
<!-- ======================================================================= -->
<div class="doc_section"><a name="rot">Linkage Rules Of Thumb</a></div>
<div class="doc_text">
<p>This section contains various "rules of thumb" about what files you
should link into your programs.</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection"><a name="always">Always Link LLVMCore, LLVMSupport,
and LLVMSystem</a></div>
<div class="doc_text">
<p>No matter what you do with LLVM, the last three entries in the value of
your LLVMLIBS make variable should always be:
<tt>LLVMCore LLVMSupport.a LLVMSystem.a</tt>. There are no <tt>LLVM</tt>
programs that don't depend on these three.</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection"><a name="onlyone">Never link both archive and
re-linked library</a></div>
<div class="doc_text">
<p>There is never any point to linking both the re-linked (<tt>.o</tt>) and
the archive (<tt>.a</tt>) versions of a library. Since the re-linked version
includes the entire library, the archive version will not resolve any symbols.
You could even end up with link error if you place the archive version before
the re-linked version on the linker's command line.</p>
</div>
<!-- ======================================================================= -->
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