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| author | John Criswell <criswell@uiuc.edu> | 2003-06-12 19:34:44 +0000 |
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| committer | John Criswell <criswell@uiuc.edu> | 2003-06-12 19:34:44 +0000 |
| commit | 85ed361198994fa34a8c3635d3e77130135d35a8 (patch) | |
| tree | 26ed6b6e01dbac02a759003f8594f275d63f07a3 /docs/GettingStarted.html | |
| parent | 8fce4bf39ba5f6d653149e3fe8743ec6adfea8f0 (diff) | |
Reverted back to hand-made HTML.
Added in updates for new Makefile variables and corrected some punctuation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6687 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs/GettingStarted.html')
| -rw-r--r-- | docs/GettingStarted.html | 922 |
1 files changed, 467 insertions, 455 deletions
diff --git a/docs/GettingStarted.html b/docs/GettingStarted.html index f4083f3481..711b04cdc4 100644 --- a/docs/GettingStarted.html +++ b/docs/GettingStarted.html @@ -1,468 +1,480 @@ <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> -<head> - <title>Getting Started with LLVM System</title> -</head> - <body bgcolor="white"> - -<center> -<h1>Getting Started with the LLVM System<br> -<font size="3">By: <a href="mailto:gshi1@uiuc.edu">Guochun Shi</a>, <a - href="mailto:sabre@nondot.org">Chris Lattner</a> and <a - href="http://www.cs.uiuc.edu/%7Evadve">Vikram Adve</a> </font></h1> -</center> - <!--=====================================================================--> - -<h2><a name="Contents">Contents</a></h2> - <!--=====================================================================--> - -<ul> - <li><a href="#overview">Overview</a> </li> - <li><a href="#starting">Getting started with LLVM</a> - <ol> - <li><a href="#quickstart">Getting started quickly (a summary)</a> - </li> - <li><a href="#checkout">Checkout LLVM from CVS</a> </li> - <li><a href="#terminology">Terminology and Notation</a> </li> - <li><a href="#objfiles">The location for object files</a> </li> - <li><a href="#config">Local Configuration Options</a> </li> - <li><a href="#environment">Setting up your environment</a> - </li> - <li><a href="#compile">Compiling the source code</a> </li> - </ol> - </li> - <li><a href="#layout">Program layout</a> + <head> + <title>Getting Started with LLVM System</title> + </head> + + <body bgcolor=white> + <center><h1>Getting Started with the LLVM System<br><font size=3>By: <a + href="mailto:gshi1@uiuc.edu">Guochun Shi</a>, + <a href="mailto:sabre@nondot.org">Chris Lattner</a> and + <a href="http://www.cs.uiuc.edu/~vadve">Vikram Adve</a> + </font></h1></center> + + <!--=====================================================================--> + <h2><a name="Contents">Contents</a></h2> + <!--=====================================================================--> + + <ul> + <li><a href="#overview">Overview</a> + <li><a href="#starting">Getting started with LLVM</a> + <ol> + <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>, & + <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> - <li><a href="#cvsdir">CVS directories</a> </li> - <li><a href="#dd"><tt>Depend</tt>, <tt>Debug</tt>, & - <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> - <li><a href="#test"><tt>llvm/test</tt></a> </li> - <li><a href="#tools"><tt>llvm/tools</tt></a> </li> + <li>Find the path to the CVS repository containing LLVM (we'll call this <i>CVSROOTDIR</i>). + <li><tt>cd <i>where-you-want-llvm-to-live</i></tt> + <li><tt>cvs -d <i>CVSROOTDIR</i> checkout llvm</tt> + <li><tt>cd llvm</tt> + <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>Set your LLVM_LIB_SEARCH_PATH environment variable. + <li><tt>gmake -k |& tee gnumake.out + # this is csh or tcsh syntax</tt> </ol> - </li> - <li><a href="#tutorial">An example using the LLVM tool chain</a> - </li> - <li><a href="#links">Links</a> </li> -</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 |& tee gnumake.out # 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. + + <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. + + <!-------------------------------------------------------------------------> + <h3><a name="terminology">Terminology and Notation</a></h3> + <!-------------------------------------------------------------------------> + + <p>Throughout 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> - -<ul> - -</ul> - <!-------------------------------------------------------------------------> - -<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 - the CVS repository containing LLVM source code (we'll call this <i>CVSROOTDIR</i> -below). Ask the person responsible for your local LLVM installation -to give you this path. </p> -<p>To get a fresh copy of the entire source code, all you need to do -is check it out from CVS as follows: </p> -<ul> - <li><tt>cd <i>where-you-want-llvm-to-live</i></tt> </li> - <li><tt>cvs -d <i>CVSROOTDIR</i> checkout llvm</tt> - <p></p> - </li> -</ul> - -<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, -and local copies of documentation files.</p> - <!-------------------------------------------------------------------------> - -<h3><a name="config">Local Configuration Options</a></h3> - <!-------------------------------------------------------------------------> - -<p>The file <tt>llvm/Makefile.config</tt> 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 - of LLVM (if the default values do not already match your system): -</p> -<ul> - - <p></p> - <li><i>CXX</i> = Path to C++ compiler to use. - <p></p> - </li> - <li><i>OBJ_ROOT</i> = Path to the llvm directory where object files -should be placed. (See the Section on <a href="#objfiles"> The -location for LLVM object files</a> for more information.) - <p></p> - </li> - <li><i>LLVMGCCDIR</i> = Path to the location of the LLVM front-end -binaries and associated libraries. - <p></p> - </li> - <li><i>PURIFY</i> = Path to the purify program. </li> -</ul> - 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>" -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 -for the X86 version of the C front-end on our research machines. -<p> <!-------------------------------------------------------------------------> - </p> -<h3><a name="objfiles">The location for LLVM object files</a></h3> - <!-------------------------------------------------------------------------> - -<p>The LLVM make system sends most output files generated during the build - into the directory defined by the variable OBJ_ROOT in <tt>llvm/Makefile.config</tt>. - 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. - </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> -<p> <!-------------------------------------------------------------------------> - </p> -<h3><a name="environment">Setting up your environment</a></h3> - <!-------------------------------------------------------------------------> - <i>NOTE: This step is optional but will set up your environment so you - can use the compiled LLVM tools with as little hassle as possible.</i>) - -<p>Add the following lines to your <tt>.cshrc</tt> (or the corresponding - lines to your <tt>.profile</tt> if you use a bourne shell derivative). - </p> -<pre> # Make the C front end easy to use...<br> alias llvmgcc <i>LLVMGCCDIR</i><tt>/bin/llvm-gcc</tt> + <ul> + </ul> + + <!-------------------------------------------------------------------------> + <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 + the CVS repository containing LLVM source code (we'll call this + <i>CVSROOTDIR</i> below). Ask the person responsible for your local LLVM + installation to give you this path. + + <p>To get a fresh copy of the entire source code, all you + need to do is check it out from CVS as follows: + <ul> + <li><tt>cd <i>where-you-want-llvm-to-live</i></tt> + <li><tt>cvs -d <i>CVSROOTDIR</i> checkout llvm</tt></p> + </ul> + + <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, and local copies of documentation files.</p> + + <!-------------------------------------------------------------------------> + <h3><a name="config">Local Configuration Options</a></h3> + <!-------------------------------------------------------------------------> + + <p>The file <tt>llvm/Makefile.config</tt> + defines the following path variables + which are specific to a particular installation of LLVM. + These need to be modified only once after checking out a copy + of LLVM (if the default values do not already match your system): + + <ul> + <p><li><i>CXX</i> = Path to C++ compiler to use. + <p><li><i>OBJ_ROOT</i> = Path to the llvm directory where + object files should be placed. + (See the Section on <a href=#objfiles> + The location for LLVM object files</a> + for more information.) + <p><li><i>LLVMGCCDIR</i> = Path to the location of the LLVM front-end + binaries and associated libraries. + <p><li><i>PURIFY</i> = Path to the purify program. + </ul> + + 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>" when linking. This variable should be set + to the absolute path for the bytecode-libs subdirectory of the C front-end + install. For example, one might use + <tt>/home/vadve/lattner/local/x86/llvm-gcc/bytecode-libs</tt> for the X86 + version of the C front-end on our research machines.<p> + + <!-------------------------------------------------------------------------> + <h3><a name="objfiles">The location for LLVM object files</a></h3> + <!-------------------------------------------------------------------------> + + <p>The LLVM make system sends most output files generated during the build + into the directory defined by the variable OBJ_ROOT in + <tt>llvm/Makefile.config</tt>. 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. + + <p>If you do not wish to use a different location for object files (i.e. + you are building into the source tree directly), just set this variable to + ".".<p> + + <!-------------------------------------------------------------------------> + <h3><a name="environment">Setting up your environment</a></h3> + <!-------------------------------------------------------------------------> + + <i>NOTE: This step is optional but will set up your environment so you + can use the compiled LLVM tools with as little hassle as + possible.</i>) + + <p>Add the following lines to your <tt>.cshrc</tt> (or the corresponding + lines to your <tt>.profile</tt> if you use a bourne shell derivative). + + <pre> + # Make the C front end easy to use... + alias llvmgcc <i>LLVMGCCDIR</i><tt>/bin/llvm-gcc</tt> # Make the LLVM tools easy to use... - setenv PATH <i>OBJ_ROOT</i>/llvm/tools/Debug:${PATH}<br> </pre> - The <tt>llvmgcc</tt> alias is useful because the C compiler is not - included in the CVS tree you just checked out. -<p>The other <a href="#tools">LLVM tools</a> are part of the LLVM source -base and are built when compiling LLVM. They will be built into the -<tt><i>OBJ_ROOT</i>/tools/Debug</tt> directory.</p> - <!-------------------------------------------------------------------------> - -<h3><a name="compile">Compiling the source code</a></h3> - <!-------------------------------------------------------------------------> - -<p>Every directory in the LLVM source tree includes a <tt>Makefile</tt> to - build it and any subdirectories that it contains. These makefiles require - GNU Make (<tt>gmake)</tt> instead of <tt>make</tt> to build them, but -can otherwise be used freely. To build the entire LLVM system, just -enter the top level <tt>llvm</tt> directory and type <tt>gmake</tt>. - A few minutes later you will hopefully have a freshly compiled toolchain -waiting for you in <tt><i>OBJ_ROOT</i></tt><tt>/llvm/tools/Debug</tt>. - If you want to look at the libraries that were compiled, look in <tt><i>OBJ_ROOT</i></tt><tt>/llvm/lib/Debug</tt>.</p> - If you get an error about the <tt>/localhome</tt> directory, chances -are good that something has been misconfigured. Follow the instructions -in the section about <a href="#environment">Setting Up Your Environment.</a> - <!--=====================================================================--> + setenv PATH <i>OBJ_ROOT</i>/llvm/tools/Debug:${PATH} + </pre> + The <tt>llvmgcc</tt> alias is useful because the C compiler is not + included in the CVS tree you just checked out. -<center> -<h2><a name="layout"><b>Program Layout</b></a></h2> - </center> - <!--=====================================================================--> - -<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>. -The following is a brief introduction to code layout:</p> - <!-------------------------------------------------------------------------> - -<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>, & <tt>Release</tt> + <p>The other <a href="#tools">LLVM tools</a> are part of the LLVM + source base and built when compiling LLVM. They will be built into the + <tt><i>OBJ_ROOT</i>/tools/Debug</tt> directory.</p> + + <!-------------------------------------------------------------------------> + <h3><a name="compile">Compiling the source code</a></h3> + <!-------------------------------------------------------------------------> + + <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 + that you use GNU Make (aka <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>. A few minutes + later you will hopefully have a freshly compiled toolchain waiting for you + in <tt><i>OBJ_ROOT</i>/llvm/tools/Debug</tt>. If you want to look at the + libraries that were compiled, look in + <tt><i>OBJ_ROOT</i>/llvm/lib/Debug</tt>.</p> + + If you get an error about a <tt>/localhome</tt> directory, follow the + instructions in the section about <a href="#environment">Setting Up Your + Environment.</a> + + + + <!--=====================================================================--> + <center> + <h2><a name="layout"><b>Program Layout</b></a></h2> + </center> + <!--=====================================================================--> + + <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>. The + following is a brief introduction to code layout:</p> + + + <!-------------------------------------------------------------------------> + <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>, & <tt>Release</tt> directories</a></h3> - <!-------------------------------------------------------------------------> - If you are building with the "<tt>OBJ_ROOT=.</tt>" option enabled in -the <tt>Makefile.config</tt> file, most source directories will contain -two directories, <tt>Depend</tt> and <tt>Debug</tt>. The <tt>Depend</tt> - directory contains automatically generated dependance files which are -used during compilation to make sure that source files get rebuilt if -a header file they use is modified. The <tt>Debug</tt> directory holds -the object files, library files, and executables that are used for building -a debug enabled build. The <tt>Release</tt> directory is created to -hold the same files when the <tt>ENABLE_OPTIMIZED=1</tt> flag is passed -to <tt>gmake</tt>, causing an optimized built to be performed. -<p> <!-------------------------------------------------------------------------> - </p> -<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> -<ol> - <li><tt>llvm/include/llvm</tt> - This directory contains all of the -LLVM specific header files. This directory also has subdirectories -for different portions of LLVM: <tt>Analysis</tt>, <tt>CodeGen</tt>, - <tt>Reoptimizer</tt>, <tt>Target</tt>, <tt>Transforms</tt>, etc... - </li> - <li><tt>llvm/include/Support</tt> - This directory contains generic - support libraries that are independant of LLVM, but are used by LLVM. - For example, some C++ STL utilities and a Command Line option processing - library. </li> -</ol> - <!-------------------------------------------------------------------------> - -<h3><a name="lib"><tt>llvm/lib</tt></a></h3> - <!-------------------------------------------------------------------------> - This directory contains most source files of LLVM system. In LLVM almost -all code exists in libraries, making it very easy to share code among -the different <a href="#tools">tools</a>. -<p> </p> -<dl compact="compact"> - <dt><tt>llvm/lib/VMCore/</tt></dt> - <dd> This directory holds the core LLVM source files that implement -core classes like Instruction and BasicBlock. </dd> - <dt><tt>llvm/lib/AsmParser/</tt></dt> - <dd> This directory holds the source code for the LLVM assembly language -parser library. </dd> - <dt><tt>llvm/lib/ByteCode/</tt></dt> - <dd> This directory holds code for reading and write LLVM bytecode. - </dd> - <dt><tt>llvm/lib/CWriter/</tt></dt> - <dd> This directory implements the LLVM to C converter. </dd> - <dt><tt>llvm/lib/Analysis/</tt></dt> - <dd> This directory contains a variety of different program analyses, -such as Dominator Information, Call Graphs, Induction Variables, Interval -Identification, Natural Loop Identification, etc... </dd> - <dt><tt>llvm/lib/Transforms/</tt></dt> - <dd> This directory contains the source code for the LLVM to LLVM -program transformations, such as Aggressive Dead Code Elimination, -Sparse Conditional Constant Propagation, Inlining, Loop Invarient Code -Motion, Dead Global Elimination, Pool Allocation, and many others... - </dd> - <dt><tt>llvm/lib/Target/</tt></dt> - <dd> This directory contains files that describe various target architectures -for code generation. For example, the llvm/lib/Target/Sparc directory -holds the Sparc machine description.<br> - </dd> - <dt><tt>llvm/lib/CodeGen/</tt></dt> - <dd> This directory contains the major parts of the code generator: -Instruction Selector, Instruction Scheduling, and Register Allocation. - </dd> - <dt><tt>llvm/lib/Reoptimizer/</tt></dt> - <dd> This directory holds code related to the runtime reoptimizer -framework that is currently under development. </dd> - <dt><tt>llvm/lib/Support/</tt></dt> - <dd> This directory contains the source code that corresponds to -the header files located in <tt>llvm/include/Support/</tt>. </dd> -</dl> - <!-------------------------------------------------------------------------> - -<h3><a name="test"><tt>llvm/test</tt></a></h3> - <!-------------------------------------------------------------------------> - -<p>This directory contains regression tests and source code that is used -to test the LLVM infrastructure...</p> - <!-------------------------------------------------------------------------> - -<h3><a name="tools"><tt>llvm/tools</tt></a></h3> - <!-------------------------------------------------------------------------> - -<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="compact"> - <dt><tt><b>as</b></tt></dt> - <dd>The assembler transforms the human readable LLVM assembly to -LLVM bytecode. - <p> </p> - </dd> - <dt><tt><b>dis</b></tt></dt> - <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> </p> - </dd> - <dt><tt><b>lli</b></tt></dt> - <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> </p> - </dd> - <dt><tt><b>llc</b></tt></dt> - <dd> <tt>llc</tt> is the LLVM backend compiler, which translates -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> + <!-------------------------------------------------------------------------> + + If you are building with the "<tt>OBJ_ROOT=.</tt>" option enabled in the + <tt>Makefile.config</tt> file, most source directories will contain two + directories, <tt>Depend</tt> and <tt>Debug</tt>. The <tt>Depend</tt> + directory contains automatically generated dependance files which are used + during compilation to make sure that source files get rebuilt if a header + file they use is modified. The <tt>Debug</tt> directory holds the object + files, library files, and executables that are used for building a debug + enabled build. The <tt>Release</tt> directory is created to hold the same + files when the <tt>ENABLE_OPTIMIZED=1</tt> flag is passed to <tt>gmake</tt>, + causing an optimized built to be performed.<p> + + + <!-------------------------------------------------------------------------> + <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> + <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> + <li><tt>llvm/include/llvm</tt> - This directory contains all of the LLVM + specific header files. This directory also has subdirectories for + different portions of LLVM: <tt>Analysis</tt>, <tt>CodeGen</tt>, + <tt>Reoptimizer</tt>, <tt>Target</tt>, <tt>Transforms</tt>, etc... + + <li><tt>llvm/include/Support</tt> - This directory contains generic + support libraries that are independant of LLVM, but are used by LLVM. + For example, header files for some C++ STL utilities and a Command Line + option processing library are located here. </ol> - </dd> - <dt><tt><b>opt</b></tt></dt> - <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> </p> - </dd> - <dt><tt><b>analyze</b></tt></dt> - <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> </p> - </dd> -</dl> - <!--=====================================================================--> - -<h2><a name="tutorial">An example using the LLVM tool chain</a></h2> - <a name="tutorial"> <!--=====================================================================--> - </a> -<ol> - <a name="tutorial"> <li>First, create a simple C file, name it 'hello.c': - - <pre> #include <stdio.h><br> int main() {<br> printf("hello world\n");<br> return 0;<br> }<br> </pre> - </li> - <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 < 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> + + <!-------------------------------------------------------------------------> + <h3><a name="lib"><tt>llvm/lib</tt></a></h3> + <!-------------------------------------------------------------------------> + + This directory contains most source files of LLVM system. In LLVM, almost + all code exists in libraries, making it very easy to share code among the + different <a href="#tools">tools</a>.<p> + + <dl compact> + <dt><tt>llvm/lib/VMCore/</tt><dd> This directory holds the core LLVM + source files that implement core classes like Instruction and BasicBlock. + + <dt><tt>llvm/lib/AsmParser/</tt><dd> This directory holds the source code + for the LLVM assembly language parser library. + + <dt><tt>llvm/lib/ByteCode/</tt><dd> This directory holds code for reading + and write LLVM bytecode. + + <dt><tt>llvm/lib/CWriter/</tt><dd> This directory implements the LLVM to C + converter. + + <dt><tt>llvm/lib/Analysis/</tt><dd> This directory contains a variety of + different program analyses, such as Dominator Information, Call Graphs, + Induction Variables, Interval Identification, Natural Loop Identification, + etc... + + <dt><tt>llvm/lib/Transforms/</tt><dd> This directory contains the source + code for the LLVM to LLVM program transformations, such as Aggressive Dead + Code Elimination, Sparse Conditional Constant Propagation, Inlining, Loop + Invarient Code Motion, Dead Global Elimination, Pool Allocation, and many + others... + + <dt><tt>llvm/lib/Target/</tt><dd> This directory contains files that + describe various target architectures for code generation. For example, + the llvm/lib/Target/Sparc directory holds the Sparc machine + description.<br> + + <dt><tt>llvm/lib/CodeGen/</tt><dd> This directory contains the major parts + of the code generator: Instruction Selector, Instruction Scheduling, and + Register Allocation. + + <dt><tt>llvm/lib/Reoptimizer/</tt><dd> This directory holds code related + to the runtime reoptimizer framework that is currently under development. + + <dt><tt>llvm/lib/Support/</tt><dd> This directory contains the source code + that corresponds to the header files located in + <tt>llvm/include/Support/</tt>. + </dl> + + <!-------------------------------------------------------------------------> + <h3><a name="test"><tt>llvm/test</tt></a></h3> + <!-------------------------------------------------------------------------> + + <p>This directory contains regression tests and source code that is used to + test the LLVM infrastructure...</p> + + <!-------------------------------------------------------------------------> + <h3><a name="tools"><tt>llvm/tools</tt></a></h3> + <!-------------------------------------------------------------------------> + + <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 <stdio.h> + 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> -<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> + <tt>% ./hello</tt><p> + + or<p> + + <tt>% lli hello.bc</tt><p> + + <li>Use the <tt>dis</tt> utility to take a look at the LLVM assembly + code:<p> + + <tt>% dis < hello.bc | less</tt><p> + + <li>Compile the program to native Sparc assembly using the code + generator:<p> + + <tt>% llc hello.bc -o hello.s</tt><p> + + <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> + + <li>Execute the native sparc program:<p> + + <tt>% ./hello.sparc</tt><p> + + </ol> + + + <!--=====================================================================--> + <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> + + <!-- Created: Mon Jul 1 02:29:02 CDT 2002 --> + <!-- hhmts start --> +Last modified: Tue Jun 3 22:06:43 CDT 2003 +<!-- hhmts end --> + </body> </html> |