Initial checkin of document, contributed by Reid Spencer.
llvm-svn: 11901
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html>
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<head>
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<title>Object Files: Understanding The Result Of LLVM Compilation</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">Object Files: Understanding The Result Of LLVM Compilation</div>
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<hr>
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<ol>
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<li><a href="#abstract">Abstract</a></li>
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<li><a href="#introduction">Introduction</a></li>
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<li><a href="#files">File Contents</a></li>
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<li><a href="#rot">Linkage Rules Of Thumb</a>
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<ol>
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<li><a href="#always">Always Link vmcore.o, support.a</a>
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<li><a href="#placeholder">Placeholder</a>
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</ol>
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</li>
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</ol>
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<div class="doc_text">
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<p><b>Written by <a href="mailto:rspencer@x10sys.com">Reid Spencer</a> </b></p>
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<p> </p>
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</div>
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<hr>
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<!-- ======================================================================= -->
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<div class="doc_section"><a name="abstract">Abstract</a></div>
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<div class="doc_text">
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<p>This document describes the contents of the many objects files and libraries
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that are produced by compiling LLVM. To make use of LLVM this information is
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needed in order to understand what files should be linked into your program.
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</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_section"> <a name="introduction">Introduction</a></div>
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<div class="doc_text">
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<p>If you're writing a compiler, virtual machine, or any other utility for
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LLVM, you'll need to figure out which of the many .a (archive) and .o
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(object) files you will need to link with to be successful. An
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understanding of the contents of these files and their inter-relationships
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will be useful in coming up with an optimal specification for the objects
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and libraries to link with.
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</p>
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<p>The purpose of this document is to hopefully reduce some of the trial and
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error that the author experienced in using LLVM.
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</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_section"><a name="files"></a>File Contents</div>
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<div class="doc_text">
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<p>The table below provides a summary of the basic contents of each file.</p>
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<table class="doc_table"
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style="width:80%; text-align: left; border: 2px solid blue; border-collapse: collapse;">
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<tr class="doc_table">
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<td colspan="2" class="doc_section">Summary Of LLVM Library And Object Files
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</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue"><h2><u>Library</u></h2></td>
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<td style="border: 2px solid blue"><h2><u>Description</u></h2></td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">libipo.a</td>
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<td style="border: 2px solid blue">
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An archive of all inter-procedural optimizations.
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</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">libscalaropts.a</td>
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<td style="border: 2px solid blue">
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An archive of all scalar optimizations.
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</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">libtransforms.a</td>
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<td style="border: 2px solid blue">
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An archive of all code transformations.
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</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">libtarget.a</td>
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<td style="border: 2px solid blue">
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An archive containing target (machine) specific code.
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</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">libanalysis.a</td>
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<td style="border: 2px solid blue">
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An archive containing analysis code.
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</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">libdatastructure.a</td>
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<td style="border: 2px solid blue">
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An archive containing optimizations for data structures.
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</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">libinstrument.a</td>
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<td style="border: 2px solid blue">No idea.</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">libregalloc.a</td>
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<td style="border: 2px solid blue">Register Allocation code.</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">libipa.a</td>
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<td style="border: 2px solid blue">Inter-procedural ??</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">libtransformutils.a</td>
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<td style="border: 2px solid blue">
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Utiltities for transformations?
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</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">libsupport.a</td>
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<td style="border: 2px solid blue">General support utilities</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue"><h2><u>Object File</u></h2></td>
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<td style="border: 2px solid blue"><h2><u>Description</u></h2></td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">support.o</td>
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<td style="border: 2px solid blue">General support utilities</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">asmparser.o</td>
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<td style="border: 2px solid blue">Assembler Parser</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">bcreader.o</td>
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<td style="border: 2px solid blue">Byte Code Reader</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">bcwriter.o</td>
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<td style="border: 2px solid blue">Byte Code Writer</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">sched.o</td>
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<td style="border: 2px solid blue">Scheduler? For What?</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">selectiondag.o</td>
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<td style="border: 2px solid blue">Selection Directed Acyclic Graph?</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">transformutils.o</td>
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<td style="border: 2px solid blue">Utilities for code transformations</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">ipa.o</td>
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<td style="border: 2px solid blue">Inter-Procedural Analysis Optimizations</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">select.o</td>
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<td style="border: 2px solid blue">Select Statement?</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">cwriter.o</td>
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<td style="border: 2px solid blue">"C" Code Writer</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">profpaths.o</td>
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<td style="border: 2px solid blue">Profile Paths?</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">regalloc.o</td>
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<td style="border: 2px solid blue">Register Allocation</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">instrument.o</td>
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<td style="border: 2px solid blue">Instrumentation? Of What?</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">datastructure.o</td>
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<td style="border: 2px solid blue">Data Structure Analysis</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">codegen.o</td>
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<td style="border: 2px solid blue">Native code generation</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">livevar.o</td>
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<td style="border: 2px solid blue">Live Variable Analysis</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">vmcore.o</td>
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<td style="border: 2px solid blue">Virtual Machine Core</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">lli-interpreter.o</td>
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<td style="border: 2px solid blue">Interpreter for LLVM ByteCode</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">lli-jit.o</td>
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<td style="border: 2px solid blue">
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Just-In-Time Compiler For LLVM ByteCode
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</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">executionengine.o</td>
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<td style="border: 2px solid blue">Engine for LLI</td>
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</tr>
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<td style="border: 2px solid blue">debugger.o</td>
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<td style="border: 2px solid blue">Source Level Debugging Support</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">analysis.o</td>
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<td style="border: 2px solid blue">General Framework For Analysis?</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">sparc.o</td>
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<td style="border: 2px solid blue">Sun SPARC Processor Specific</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">target.o</td>
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<td style="border: 2px solid blue">Target Machine Support?</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">transforms.o</td>
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<td style="border: 2px solid blue">Code Transformations</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">x86.o</td>
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<td style="border: 2px solid blue">Intel x86 Processor Specific</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">powerpc.o</td>
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<td style="border: 2px solid blue">PowerPC Processor Specific</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">scalaropts.o</td>
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<td style="border: 2px solid blue">Optimizations For Scalars</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">ipo.o</td>
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<td style="border: 2px solid blue">Inter-Procedural Optimization</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">trace.o</td>
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<td style="border: 2px solid blue">Support For Tracing/Debugging?</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">profile_rt.o</td>
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<td style="border: 2px solid blue">Runtime Library For Profiler</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">sample.o</td>
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<td style="border: 2px solid blue">Sample Program ?</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">stkr_compiler.o</td>
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<td style="border: 2px solid blue">Stacker Language Compiler Library</td>
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</tr>
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<tr class="doc_table">
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<td style="border: 2px solid blue">stkr_runtime.o</td>
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<td style="border: 2px solid blue">Stacker Language Runtime Library</td>
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</tr>
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</table>
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</div>
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<p></p>
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<!-- ======================================================================= -->
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<div class="doc_section"><a name="rot">Linkage Rules Of Thumb</a></div>
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<div class="doc_text">
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<p>This section contains various "rules of thumb" about what files you
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should link into your programs.</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="always">Always Link vmcore.o support.a</a>
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</div>
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<div class="doc_text">
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<p>No matter what you do with LLVM, you'll always need to link with vmcore.o
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and support.a.</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="Placeholder">Placeholder</a></div>
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<div class="doc_text">
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<p>Need more rules of thumb here.</p>
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</div>
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<!-- ======================================================================= -->
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<hr>
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<div class="doc_footer">
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<address><a href="mailto:rspencer@x10sys.com">Reid Spencer</a></address>
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<a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a>
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<br>Last modified: $Date$ </div>
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</body>
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</html>
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<!-- vim: sw=2 ts=2 ai
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-->
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