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gerrit-public.fairphone.software / fp2-dev / platform / external / llvm / 27b40bcc9c05ffebb84cc53b54858af2d869dcd4 / . / docs / ReleaseNotes.html
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6 <title>LLVM 1.1 Release Notes</title>
7</head>
8<body>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]9
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]10<div class="doc_title">
11 LLVM 1.1 Release Notes
12</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]13
14<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]15 <li><a href="#intro">Introduction</a></li>
16 <li><a href="#whatsnew">What's New?</a></li>
17 <li><a href="#portability">Portability and Supported Platforms</a></li>
18 <li><a href="#install-instructions">Installation Instructions</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]19 <li><a href="#knownproblems">Known Problems</a>
20 <ul>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]21<!-- <li><a href="#portabilityprobs">Portability Problems</a> -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]22 <li><a href="#core">Known problems with the LLVM Core</a>
23 <li><a href="#c-fe">Known problems with the C Front-end</a>
24 <li><a href="#c++-fe">Known problems with the C++ Front-end</a>
25 <li><a href="#x86-be">Known problems with the X86 Back-end</a>
26 <li><a href="#sparc-be">Known problems with the Sparc Back-end</a>
27 <li><a href="#c-be">Known problems with the C back-end</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]28 </ul></li>
29 <li><a href="#additionalinfo">Additional Information</a></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]30</ol>
31
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]32<div class="doc_text">
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]33 <p><b>Written by <a href="mailto:sabre@nondot.org">Chris Lattner</a></b><p>
34</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]35
36<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]37<div class="doc_section">
38 <a name="intro">Introduction</a>
39</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]40<!-- *********************************************************************** -->
41
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]42<div class="doc_text">
43
44<p>This document contains the release notes for the LLVM compiler
45infrastructure, release 1.1. Here we describe the status of LLVM, including any
46known problems, and bug fixes from the previous release. The most up-to-date
47version of this document can be found on the <a
Chris Lattner12d90632003-10-27 01:31:14 +0000[diff] [blame]48href="http://llvm.cs.uiuc.edu/releases/1.1/">LLVM 1.1 web site</a>. If you are
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]49not reading this on the LLVM web pages, you should probably go there, because
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]50this document may be updated after the release.</p>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]51
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]52<p>For more information about LLVM, including information about potentially more
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]53current releases, please check out the <a href="http://llvm.cs.uiuc.edu">main
54web site</a>. If you have questions or comments, the <a
55href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]56list</a> is a good place to send them.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]57
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]58<p>Note that if you are reading this file from CVS, that this document applies
59to the <i>next</i> release, not the previous one. To see the release notes for
60the previous release, see the <a
61href="http://llvm.cs.uiuc.edu/releases/">releases page</a>.</p>
62
63</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]64
65<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]66<div class="doc_section">
67 <a name="whatsnew">What's New?</a>
68</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]69<!-- *********************************************************************** -->
70
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]71<div class="doc_text">
72
73<p>This is the second public release of the LLVM compiler infrastructure. This
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]74release is primarily a bugfix release, dramatically improving the C/C++
75front-end, and improving support for C++ in the LLVM core. This release also
Chris Lattner7fcfac02003-12-06 20:24:46 +0000[diff] [blame]76includes a few new features, such as a simple profiler, support for Mac OS/X,
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]77and better interoperability with external source bases.</p>
78
Chris Lattner2d9d4e72003-12-11 23:31:21 +0000[diff] [blame]79<p>At this time, LLVM is known to correctly compile the C &amp; C++ SPEC CPU2000
80benchmarks (X86 only), the Olden benchmarks, and the Ptrdist benchmarks along
81with <b>many</b> other programs. LLVM now also works with a broad variety of
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]82C++ programs, though it has still received much less testing than the C
83front-end.
84</p>
85
86<p>
87Note that the Sparc and X86 backends do not currently support exception throwing
88or long jumping (including 253.perlbmk in SPEC). For these programs, you must
89use the C backend. Support for unwinding will be added in a future release.
90</p>
91
92
93<!--=========================================================================-->
94<div class="doc_subsubsection">
95This release implements the following new features:
96</div>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]97
98<ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]99<li><a
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]100href="http://mail.cs.uiuc.edu/pipermail/llvmdev/2003-November/000528.html">A new
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]101LLVM profiler, similar to gprof</a> is available</li>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]102
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]103<li>LLVM and the C/C++ front-end now compile on Mac OS/X! Mac OS/X users can
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]104now explore the LLVM optimizer with the C backend (note that LLVM requires GCC
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]1053.3 on Mac OS/X).</li>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]106
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]107<li>LLVM has been <a
Chris Lattner2a77f2d2003-11-11 23:46:35 +0000[diff] [blame]108href="http://mail.cs.uiuc.edu/pipermail/llvmdev/2003-November/000554.html">moved
109into an 'llvm' C++ namespace</a>, for easier integration with third-party
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]110code. Note that lack of namespace handling in GDB 5.x, you will probably want to
111upgrade to GDB 6 or better to debug LLVM code.</li>
John Criswellf2ec35b2003-11-26 20:09:49 +0000[diff] [blame]112
113<li>
114The build system now copies Makefiles dynamically from the source tree to the
115object tree as subdirectories are built. This means that:
116 <ol>
117 <li>
118 New directories can be added to the source tree, and the build will
119 automatically pick them up (i.e. no need to re-run <tt>configure</tt>).
120 </li>
121
122 <li>
123 You will need to build LLVM from the top of the object tree once to ensure
124 that all of the Makefiles are copied into the object tree subdirectories.
125 </li>
126 </ol>
127</li>
128
Chris Lattner2d9d4e72003-12-11 23:31:21 +0000[diff] [blame]129<li>The <tt>configure</tt> script will now configure all projects placed in the
130<tt>llvm/projects</tt> directory.</li>
131
132<li>The <tt>-basicaa</tt> pass (the default alias analysis) has been upgraded to be <a href="http://llvm.cs.uiuc.edu/PR86">significantly more precise</a>.</li>
133
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]134</ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]135
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]136
137<!--=========================================================================-->
138<div class="doc_subsubsection">
139In this release, the following missing features were implemented:
140</div>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]141
142<ol>
143<li><a href="http://llvm.cs.uiuc.edu/PR88">The interpreter does not support
144invoke or unwind</a></li>
Misha Brukmanc99037d2003-11-14 03:30:43 +0000[diff] [blame]145
146<li><a href="http://llvm.cs.uiuc.edu/PR99">Interpreter does not support the
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]147<tt>vaarg</tt> instruction</a></li>
Misha Brukmanc99037d2003-11-14 03:30:43 +0000[diff] [blame]148
Brian Gaekeb7508ee2003-11-16 23:49:26 +0000[diff] [blame]149<li><a href="http://llvm.cs.uiuc.edu/PR117">llvm-nm cannot read archive
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]150files</a></li>
Brian Gaekeb7508ee2003-11-16 23:49:26 +0000[diff] [blame]151
Brian Gaekea6ffa542003-12-11 04:40:58 +0000[diff] [blame]152<li><a href="http://llvm.cs.uiuc.edu/PR146">Interpreter does not handle
153setne constant expression</a></li>
154
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]155</ol>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]156
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]157
158<!--=========================================================================-->
159<div class="doc_subsubsection">
160In this release, the following Quality of Implementation issues were
161fixed:
162</div>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]163
164<ol>
Chris Lattner0ef19062003-11-08 04:28:55 +0000[diff] [blame]165
166<li><a href="http://llvm.cs.uiuc.edu/PR29">C++ front-end is not generating
167linkonce linkage type when it can</a></li>
168
169<li><a href="http://llvm.cs.uiuc.edu/PR84">C front-end doesn't emit
170getelementptr for address of array element</a></li>
171
Chris Lattnerba46d552003-11-16 20:25:24 +0000[diff] [blame]172<li><a href="http://llvm.cs.uiuc.edu/PR96">Bad path to the C/C++ frontend causes
173build problems</a></li>
174
175<li><a href="http://llvm.cs.uiuc.edu/PR114">LLVM header files should be -Wold-style-cast clean</a></li>
176
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]177<li>The LLVM bytecode reader has been <a
178href="http://llvm.cs.uiuc.edu/PR127">sped up a lot</a> (up to 4x in some
179cases).</li>
180
Chris Lattner9f9d00a2003-11-22 01:14:58 +0000[diff] [blame]181<li>Methods and functions in anonymous namespaces <a href="http://llvm.cs.uiuc.edu/PR85">now get internal linkage</a>.</li>
182
Chris Lattnerf7330732003-11-26 08:20:34 +0000[diff] [blame]183<li>Constant initializers now generate loops instead of potentially <a href="http://llvm.cs.uiuc.edu/PR75">huge amounts of straight-line code</a>.</li>
184
Chris Lattner3074b342003-11-27 09:51:54 +0000[diff] [blame]185<li>Code for running C++ destructors is now properly shared when possible. Before, the C++ front-end
186<a href="http://llvm.cs.uiuc.edu/PR11">generated N^2 amounts of duplicated cleanup code</a> in some cases.</li>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]187</ol>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]188
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]189
190<!--=========================================================================-->
191<div class="doc_subsubsection">
192In this release, the following bugs in the previous release were fixed:
193</div>
194
195<p>Bugs in the LLVM Core:</p>
Chris Lattner47ad72c2003-10-07 21:38:31 +0000[diff] [blame]196
197<ol>
Chris Lattnerf7100202003-10-27 05:41:39 +0000[diff] [blame]198<li><a href="http://llvm.cs.uiuc.edu/PR57">[inliner] Inlining invoke with PHI in unwind target is broken</a></li>
Chris Lattner89ca2b82003-10-27 17:06:39 +0000[diff] [blame]199<li><a href="http://llvm.cs.uiuc.edu/PR58">[linker] linkonce globals should link successfully to external globals</a></li>
Chris Lattner32547fe2003-10-29 07:17:13 +0000[diff] [blame]200<li><a href="http://llvm.cs.uiuc.edu/PR64">[constmerge] Constant merging pass merges constants with external linkage</a></li>
Chris Lattner34790e52003-10-29 18:49:14 +0000[diff] [blame]201<li><a href="http://llvm.cs.uiuc.edu/PR66">[scalarrepl] Scalar Replacement of aggregates is decimating structures it shouldn't be</a></li>
Chris Lattner36bd5d12003-10-30 01:20:42 +0000[diff] [blame]202<li><a href="http://llvm.cs.uiuc.edu/PR70">[instcombine] Resolving invoke inserts cast after terminator</a></li>
Chris Lattnerf9e8a0f2003-10-30 01:43:33 +0000[diff] [blame]203<li><a href="http://llvm.cs.uiuc.edu/PR71">llvm-as crashes when labels are used in phi nodes</a></li>
Chris Lattner3dcc7b92003-10-30 16:20:15 +0000[diff] [blame]204<li><a href="http://llvm.cs.uiuc.edu/PR72">[build problem] Callgraph.cpp not pulled in from libipa.a</a></li>
Chris Lattner3af47222003-11-16 22:11:42 +0000[diff] [blame]205<li><a href="http://llvm.cs.uiuc.edu/PR77">Variables in scope of output setjmp
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]206calls should be volatile</a> (Note that this does not effect correctness on
207many platforms, such as X86).</li>
Chris Lattner2fb1ef82003-11-03 20:08:08 +0000[diff] [blame]208<li><a href="http://llvm.cs.uiuc.edu/PR83">[X86] Emission of global bool initializers broken</a></li>
Chris Lattnerde3bb572003-11-05 06:30:04 +0000[diff] [blame]209<li><a href="http://llvm.cs.uiuc.edu/PR91">[gccld] The -r (relinking) option does not work correctly</a></li>
Chris Lattner5b3fb032003-11-07 04:46:56 +0000[diff] [blame]210<li><a href="http://llvm.cs.uiuc.edu/PR92">[bcreader] Cannot read shift constant expressions from bytecode file</a></li>
211<li><a href="http://llvm.cs.uiuc.edu/PR93">[lowersetjmp] Lowersetjmp pass breaks dominance properties!</a></li>
Chris Lattner11dde852003-11-09 19:44:07 +0000[diff] [blame]212<li><a href="http://llvm.cs.uiuc.edu/PR95">SymbolTable::getUniqueName is very inefficient</a></li>
Brian Gaekea6ffa542003-12-11 04:40:58 +0000[diff] [blame]213<li><a href="http://llvm.cs.uiuc.edu/PR97">bugpoint must not pass -R&lt;directory&gt; to Mach-O linker</a></li>
Chris Lattner5b3fb032003-11-07 04:46:56 +0000[diff] [blame]214<li><a href="http://llvm.cs.uiuc.edu/PR98">[buildscripts] Building into objdir with .o in it fails</a></li>
Chris Lattner7af4d5e2003-11-08 05:18:50 +0000[diff] [blame]215<li><a href="http://llvm.cs.uiuc.edu/PR101">[setjmp/longjmp] Linking C programs which use setjmp/longjmp sometimes fail with references to the C++ runtime library!</a></li>
Chris Lattner9b29bde2003-11-12 04:42:37 +0000[diff] [blame]216<li><a href="http://llvm.cs.uiuc.edu/PR107">AsmParser Misses Symbol Redefinition Error</a></li>
Brian Gaeke78792062003-11-11 21:52:34 +0000[diff] [blame]217<li><a href="http://llvm.cs.uiuc.edu/PR108">gccld -Lfoo -lfoo fails to find ./foo/libfoo.a</a></li>
Chris Lattner6e4046f2003-11-14 06:42:01 +0000[diff] [blame]218<li><a href="http://llvm.cs.uiuc.edu/PR110">[bcreader] Incorrect cast causes misread forward constant references</a></li>
Chris Lattner5edc1bb2003-11-16 21:42:48 +0000[diff] [blame]219<li><a href="http://llvm.cs.uiuc.edu/PR116">[adce] ADCE considers blocks without postdominators to be unreachable</a></li>
Chris Lattner43a54cc2003-11-18 23:04:02 +0000[diff] [blame]220<li><a href="http://llvm.cs.uiuc.edu/PR123">[X86] div and rem constant exprs invalidate iterators!</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]221<li><a href="http://llvm.cs.uiuc.edu/PR130">[vmcore] Symbol table doesn't rename colliding variables during type resolution</a></li>
Brian Gaekea6ffa542003-12-11 04:40:58 +0000[diff] [blame]222<li><a href="http://llvm.cs.uiuc.edu/PR138">Archive reader does not understand 4.4BSD/Mac OS X long filenames</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]223<li><a href="http://llvm.cs.uiuc.edu/PR140">gccld produces a runner script that includes command-line options to load the necessary shared objects</a></li>
224</ol>
225
226
227<p>Bugs in the C/C++ front-end:</p>
228
229<ol>
230<li><a href="http://llvm.cs.uiuc.edu/PR59">C++ frontend can crash when compiling virtual base classes</a></li>
231<li><a href="http://llvm.cs.uiuc.edu/PR62">C backend fails on constant cast expr to ptr-to-anonymous struct</a></li>
232<li><a href="http://llvm.cs.uiuc.edu/PR63">#ident is not recognized by C frontend</a></li>
233<li><a href="http://llvm.cs.uiuc.edu/PR65">C front-end miscompiles the builtin_expect intrinsic!</a></li>
234<li><a href="http://llvm.cs.uiuc.edu/PR67">1.0 precompiled libstdc++ does not include wchar_t support</a></li>
235<li><a href="http://llvm.cs.uiuc.edu/PR68">llvmgcc asserts when compiling functions renamed with asm's</a></li>
236<li><a href="http://llvm.cs.uiuc.edu/PR69">C frontend crashes on some programs with lots of types.</a></li>
237<li><a href="http://llvm.cs.uiuc.edu/PR79">llvm-gcc crashes compiling global union initializer</a></li>
238<li><a href="http://llvm.cs.uiuc.edu/PR80">C front-end crash on empty structure</a></li>
239<li><a href="http://llvm.cs.uiuc.edu/PR81">CFrontend crashes when compiling C99 compound expressions</a></li>
240<li><a href="http://llvm.cs.uiuc.edu/PR87">llvm-gcc infinite loops on "case MAXINT:"</a></li>
241<li><a href="http://llvm.cs.uiuc.edu/PR89">[C++] Catch blocks make unparsable labels</a></li>
242<li><a href="http://llvm.cs.uiuc.edu/PR90">[C++] Initializing array with constructable objects fail</a></li>
243<li><a href="http://llvm.cs.uiuc.edu/PR94">llvm-gcc tries to add bools</a></li>
244<li><a href="http://llvm.cs.uiuc.edu/PR104">[c++] C++ Frontend lays out superclasses like anonymous bitfields!</a></li>
245<li><a href="http://llvm.cs.uiuc.edu/PR54">C front-end miscompiles unsigned enums whose LLVM types are signed</a></li>
246<li><a href="http://llvm.cs.uiuc.edu/PR112">Casting a string constant to void crashes llvm-gcc</a></li>
Chris Lattner43a54cc2003-11-18 23:04:02 +0000[diff] [blame]247<li><a href="http://llvm.cs.uiuc.edu/PR125">[llvmg++] Enum types are incorrectly shrunk to smaller than 'int' size</a></li>
248<li><a href="http://llvm.cs.uiuc.edu/PR128">[llvmg++] Cannot use pointer to member to initialize global</a></li>
Chris Lattner6ff1a922003-11-19 01:08:24 +0000[diff] [blame]249<li><a href="http://llvm.cs.uiuc.edu/PR131">[llvm-gcc] ?: operator as lvalue not implemented</a></li>
Chris Lattner55ee0312003-11-19 22:05:38 +0000[diff] [blame]250<li><a href="http://llvm.cs.uiuc.edu/PR133">[C/C++] Bogus warning about taking the address of 'register' variable</a></li>
Chris Lattner18c4d852003-11-20 01:07:41 +0000[diff] [blame]251<li><a href="http://llvm.cs.uiuc.edu/PR113">crash assigning into an array in a struct which contains a bitfield</a>.</li>
252<li><a href="http://llvm.cs.uiuc.edu/PR6">Oversized integer bitfields cause crash</a></li>
Chris Lattnerf7330732003-11-26 08:20:34 +0000[diff] [blame]253<li><a href="http://llvm.cs.uiuc.edu/PR141">[llvm-gcc] Bitfields &amp; large array don't mix well</a></li>
Chris Lattner6c024c4b2003-11-20 19:30:17 +0000[diff] [blame]254<li><a href="http://llvm.cs.uiuc.edu/PR132">[llvm-gcc] Complex division is not supported</a></li>
Chris Lattner5f36ebe2003-11-20 20:59:57 +0000[diff] [blame]255<li><a href="http://llvm.cs.uiuc.edu/PR143">[llvm-gcc] Illegal union field reference</a></li>
Chris Lattner38eeb152003-11-25 08:49:12 +0000[diff] [blame]256<li><a href="http://llvm.cs.uiuc.edu/PR148">[llvmg++] Front-end attempts to return structure by value</a></li>
Chris Lattner676c2552003-11-26 01:18:49 +0000[diff] [blame]257<li><a href="http://llvm.cs.uiuc.edu/PR152">[llvmg++] Pointer to member initializers not supported in constructors</a></li>
258<li><a href="http://llvm.cs.uiuc.edu/PR155">[llvm-gcc] crash on union initialization</a></li>
Chris Lattner5b266582003-11-26 02:48:00 +0000[diff] [blame]259<li><a href="http://llvm.cs.uiuc.edu/PR124">[llvm-g++] ?: expressions do not run correct number of destructors!</a></li>
Chris Lattnerf7330732003-11-26 08:20:34 +0000[diff] [blame]260<li><a href="http://llvm.cs.uiuc.edu/PR157">[llvm-gcc] Pointer & constant results in invalid shift</a></li>
Chris Lattner296b2e62003-12-08 06:33:19 +0000[diff] [blame]261<li><a href="http://llvm.cs.uiuc.edu/PR165">[llvmg++] call through array of pointers to member functions causes assertion</a></li>
Chris Lattnera5099962003-12-06 20:22:41 +0000[diff] [blame]262</ol>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]263
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]264</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]265
266<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]267<div class="doc_section">
268 <a name="portability">Portability and Supported Platforms</a>
269</div>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]270<!-- *********************************************************************** -->
271
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]272<div class="doc_text">
273
274<p>LLVM has been extensively tested on Intel and AMD machines running Red
Chris Lattner3e2959e2003-11-08 05:22:09 +0000[diff] [blame]275Hat Linux, and Sun UltraSPARC workstations running Solaris 8. Additionally,
276LLVM works on Mac OS/X 10.3 and above, but only with the C back-end (no native
277backend for the PowerPC is available yet).
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]278The core LLVM infrastructure uses "autoconf" for portability, so hopefully we
Chris Lattner3e2959e2003-11-08 05:22:09 +0000[diff] [blame]279work on more platforms than that. However, it is likely that we
280missed something, and that minor porting is required to get LLVM to work on
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]281new platforms. We welcome portability patches and error messages.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]282
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]283</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]284
285<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]286<div class="doc_section">
287 <a name="knownproblems">Known Problems</a>
288</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]289<!-- *********************************************************************** -->
290
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]291<div class="doc_text">
292
293<p>This section contains all known problems with the LLVM system, listed by
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]294component. As new problems are discovered, they will be added to these
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]295sections.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]296
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]297</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]298
299<!-- _______________________________________________________________________ -->
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]300<!--
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]301</ul><h4><a name="portability"><hr size=0>Portability Problems</h4><ul>
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]302-->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]303
304
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]305<!-- ======================================================================= -->
306<div class="doc_subsection">
307 <a name="core">Known problems with the LLVM Core</a>
308</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]309
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]310<div class="doc_text">
311
312<ul>
313
314<li>In the JIT, <tt>dlsym</tt> on a symbol compiled by the JIT will not
315work.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]316
317<li>The JIT does not use mutexes to protect its internal data structures. As
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]318such, execution of a threaded program could cause these data structures to be
319corrupted.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]320
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]321<li>It is not possible to <tt>dlopen</tt> an LLVM bytecode file in the JIT.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]322
Chris Lattnere84843b2003-10-20 19:05:03 +0000[diff] [blame]323<li>Linking in static archive files (.a files) is very slow (there is no symbol
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]324table in the archive).</li>
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]325
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]326<li><a href="http://llvm.cs.uiuc.edu/PR82">LLVM cannot handle structures with
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]327more than 256 elements</a>.</li>
328
329</ul>
330
331</div>
332
333<!-- ======================================================================= -->
334<div class="doc_subsection">
335 <a name="c-fe">Known problems with the C front-end</a>
336</div>
Chris Lattner47588f92003-10-02 05:07:23 +0000[diff] [blame]337
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]338<!-- _______________________________________________________________________ -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]339<div class="doc_subsubsection">
340 Bugs
341</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]342
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]343<div class="doc_text">
344
345<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]346
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]347<li>C99 Variable sized arrays do not release stack memory when they go out of
348 scope. Thus, the following program may run out of stack space:
349<pre>
350 for (i = 0; i != 1000000; ++i) {
351 int X[n];
352 foo(X);
353 }
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]354</pre></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]355
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]356</ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]357
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]358</div>
359
360<!-- _______________________________________________________________________ -->
361<div class="doc_subsubsection">
362 Notes
363</div>
364
365<div class="doc_text">
366
367<ul>
368
369<li>Inline assembly is not yet supported.</li>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]370
371<li>"long double" is transformed by the front-end into "double". There is no
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]372support for floating point data types of any size other than 32 and 64
373bits.</li>
374
375<li>The following Unix system functionality has not been tested and may not
376work:
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]377 <ol>
378 <li><tt>sigsetjmp</tt>, <tt>siglongjmp</tt> - These are not turned into the
379 appropriate <tt>invoke</tt>/<tt>unwind</tt> instructions. Note that
380 <tt>setjmp</tt> and <tt>longjmp</tt> <em>are</em> compiled correctly.
381 <li><tt>getcontext</tt>, <tt>setcontext</tt>, <tt>makecontext</tt>
382 - These functions have not been tested.
383 </ol></li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]384
385<li>Although many GCC extensions are supported, some are not. In particular,
386 the following extensions are known to <b>not be</b> supported:
387 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]388 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels">Local Labels</a>: Labels local to a block.</li>
389 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20as%20Values">Labels as Values</a>: Getting pointers to labels, and computed gotos.</li>
390 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html#Nested%20Functions">Nested Functions</a>: As in Algol and Pascal, lexical scoping of functions.</li>
391 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls">Constructing Calls</a>: Dispatching a call to another function.</li>
392 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Extended%20Asm">Extended Asm</a>: Assembler instructions with C expressions as operands.</li>
393 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints">Constraints</a>: Constraints for asm operands</li>
394 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Asm-Labels.html#Asm%20Labels">Asm Labels</a>: Specifying the assembler name to use for a C symbol.</li>
395 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Explicit-Reg-Vars.html#Explicit%20Reg%20Vars">Explicit Reg Vars</a>: Defining variables residing in specified registers.</li>
396 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Return-Address.html#Return%20Address">Return Address</a>: Getting the return or frame address of a function.</li>
397 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html#Vector%20Extensions">Vector Extensions</a>: Using vector instructions through built-in functions.</li>
398 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Target-Builtins.html#Target%20Builtins">Target Builtins</a>: Built-in functions specific to particular targets.</li>
399 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html#Thread-Local">Thread-Local</a>: Per-thread variables.</li>
400 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas">Pragmas</a>: Pragmas accepted by GCC.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]401 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]402
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]403 <p>The following GCC extensions are <b>partially</b> supported. An ignored
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]404 attribute means that the LLVM compiler ignores the presence of the attribute,
405 but the code should still work. An unsupported attribute is one which is
406 ignored by the LLVM compiler, which will cause a different interpretation of
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]407 the program.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]408
409 <ol>
410 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length">Variable Length</a>:
411 Arrays whose length is computed at run time.<br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]412 Supported, but allocated stack space is not freed until the function returns (noted above).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]413
414 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes">Function Attributes</a>:
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]415
416 Declaring that functions have no side effects, or that they can never
417 return.<br>
418
419 <b>Supported:</b> <tt>format</tt>, <tt>format_arg</tt>, <tt>non_null</tt>,
420 <tt>constructor</tt>, <tt>destructor</tt>, <tt>unused</tt>,
421 <tt>deprecated</tt>, <tt>warn_unused_result</tt>, <tt>weak</tt><br>
422
423 <b>Ignored:</b> <tt>noreturn</tt>, <tt>noinline</tt>,
424 <tt>always_inline</tt>, <tt>pure</tt>, <tt>const</tt>, <tt>nothrow</tt>,
425 <tt>malloc</tt>, <tt>no_instrument_function</tt>, <tt>cdecl</tt><br>
426
427 <b>Unsupported:</b> <tt>used</tt>, <tt>section</tt>, <tt>alias</tt>,
428 <tt>visibility</tt>, <tt>regparm</tt>, <tt>stdcall</tt>,
429 <tt>fastcall</tt>, all other target specific attributes</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]430
431 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes">Variable Attributes</a>:
432 Specifying attributes of variables.<br>
433 <b>Supported:</b> <tt>cleanup</tt>, <tt>common</tt>, <tt>nocommon</tt>,
434 <tt>deprecated</tt>, <tt>transparent_union</tt>,
435 <tt>unused</tt>, <tt>weak</tt><br>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]436
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]437 <b>Unsupported:</b> <tt>aligned</tt>, <tt>mode</tt>, <tt>packed</tt>,
438 <tt>section</tt>, <tt>shared</tt>, <tt>tls_model</tt>,
439 <tt>vector_size</tt>, <tt>dllimport</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]440 <tt>dllexport</tt>, all target specific attributes.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]441
442 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes">Type Attributes</a>: Specifying attributes of types.
443 <b>Supported:</b> <tt>transparent_union</tt>, <tt>unused</tt>,
444 <tt>deprecated</tt>, <tt>may_alias</tt>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]445
446 <b>Unsupported:</b> <tt>aligned</tt>, <tt>packed</tt>,
447 all target specific attributes.</li>
448
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]449 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins">Other Builtins</a>:
450 Other built-in functions.<br>
451 We support all builtins which have a C language equivalent (e.g.,
452 <tt>__builtin_cos</tt>), <tt>__builtin_alloca</tt>,
453 <tt>__builtin_types_compatible_p</tt>, <tt>__builtin_choose_expr</tt>,
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]454 <tt>__builtin_constant_p</tt>, and <tt>__builtin_expect</tt> (ignored).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]455
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]456 </ol>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]457
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]458 <p>The following extensions <b>are</b> known to be supported:</p>
459
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]460 <ol>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]461 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs">Statement Exprs</a>: Putting statements and declarations inside expressions.</li>
462 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Typeof.html#Typeof">Typeof</a>: <code>typeof</code>: referring to the type of an expression.</li>
463 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Lvalues.html#Lvalues">Lvalues</a>: Using <code>?:</code>, "<code>,</code>" and casts in lvalues.</li>
464 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals">Conditionals</a>: Omitting the middle operand of a <code>?:</code> expression.</li>
465 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long">Long Long</a>: Double-word integers.</li>
466 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex">Complex</a>: Data types for complex numbers.</li>
467 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats">Hex Floats</a>:Hexadecimal floating-point constants.</li>
468 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length">Zero Length</a>: Zero-length arrays.</li>
469 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures">Empty Structures</a>: Structures with no members.</li>
470 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Variadic-Macros.html#Variadic%20Macros">Variadic Macros</a>: Macros with a variable number of arguments.</li>
471 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines">Escaped Newlines</a>: Slightly looser rules for escaped newlines.</li>
472 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Subscripting.html#Subscripting">Subscripting</a>: Any array can be subscripted, even if not an lvalue.</li>
473 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Pointer-Arith.html#Pointer%20Arith">Pointer Arith</a>:Arithmetic on <code>void</code>-pointers and function pointers.</li>
474 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers">Initializers</a>: Non-constant initializers.</li>
475 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals">Compound Literals</a>: Compound literals give structures, unions or arrays as values.</li>
476 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits">Designated Inits</a>: Labeling elements of initializers.</li>
477 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Cast-to-Union.html#Cast%20to%20Union">Cast to Union</a>:Casting to union type from any member of the union.</li>
478 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges">Case Ranges</a>: `case 1 ... 9' and such.</li>
479 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations">Mixed Declarations</a>: Mixing declarations and code.</li>
480 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes">Function Prototypes</a>: Prototype declarations and old-style definitions.</li>
481 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/C---Comments.html#C++%20Comments">C++ Comments</a>: C++ comments are recognized.</li>
482 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs">Dollar Signs</a>: Dollar sign is allowed in identifiers.</li>
483 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Character-Escapes.html#Character%20Escapes">Character Escapes</a>: <code>\e</code> stands for the character &lt;ESC&gt;.</li>
484 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment">Alignment</a>: Inquiring about the alignment of a type or variable.</li>
485 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline">Inline</a>: Defining inline functions (as fast as macros).</li>
486 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Alternate-Keywords.html#Alternate%20Keywords">Alternate Keywords</a>:<code>__const__</code>, <code>__asm__</code>, etc., for header files.</li>
487 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Incomplete-Enums.html#Incomplete%20Enums">Incomplete Enums</a>: <code>enum foo;</code>, with details to follow.</li>
488 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html#Function%20Names">Function Names</a>: Printable strings which are the name of the current function.</li>
489 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Unnamed-Fields.html#Unnamed%20Fields">Unnamed Fields</a>: Unnamed struct/union fields within structs/unions.</li>
490 <li><a href="http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax">Attribute Syntax</a>: Formal syntax for attributes.</li>
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]491 </ol></li>
492
493</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]494
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]495<p>If you run into GCC extensions which have not been included in any of these
496lists, please let us know (also including whether or not they work).</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]497
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]498</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]499
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]500<!-- ======================================================================= -->
501<div class="doc_subsection">
502 <a name="c++-fe">Known problems with the C++ front-end</a>
503</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]504
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]505<div class="doc_text">
506
507<p>For this release, the C++ front-end is considered to be fully functional but
508of <b>beta</b> quality. It has been tested and works for a number of simple
509programs that collectively exercise most of the language. Nevertheless, it has
510not been in use as long as the C front-end. Please report any bugs or
511problems.</p>
512
513</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]514
515<!-- _______________________________________________________________________ -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]516<div class="doc_subsubsection">
517 Bugs
518</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]519
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]520<div class="doc_text">
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]521
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]522<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]523<li>The C++ front-end inherits all problems afflicting the <a href="#c-fe">C
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]524 front-end</a></li>
525</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]526
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]527</div>
528
529<!-- _______________________________________________________________________ -->
530<div class="doc_subsubsection">
531 Notes
532</div>
533
534<div class="doc_text">
535
536<ul>
Chris Lattnere01fcfb2003-10-27 18:30:37 +0000[diff] [blame]537
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]538<li>The C++ front-end is based on a pre-release of the GCC 3.4 C++ parser. This
539parser is significantly more standards compliant (and picky) than prior GCC
540versions. For more information, see the C++ section of the <a
541href="http://gcc.gnu.org/gcc-3.4/changes.html">GCC 3.4 release notes</a>.<p>
542
543<li>Destructors for local objects are not always run when a <tt>longjmp</tt> is
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]544 performed. In particular, destructors for objects in the <tt>longjmp</tt>ing
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]545 function and in the <tt>setjmp</tt> receiver function may not be run.
546 Objects in intervening stack frames will be destroyed however (which is
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]547 better than most compilers).</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]548
Chris Lattner19092612003-10-02 16:38:05 +0000[diff] [blame]549<li>The LLVM C++ front-end follows the <a
550 href="http://www.codesourcery.com/cxx-abi">Itanium C++ ABI</a>.
551 This document, which is not Itanium specific, specifies a standard for name
552 mangling, class layout, v-table layout, RTTI formats, and other C++
553 representation issues. Because we use this API, code generated by the LLVM
554 compilers should be binary compatible with machine code generated by other
555 Itanium ABI C++ compilers (such as G++, the Intel and HP compilers, etc).
556 <i>However</i>, the exception handling mechanism used by LLVM is very
557 different from the model used in the Itanium ABI, so <b>exceptions will not
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]558 interact correctly</b>. </li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]559
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]560</ul>
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]561
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]562</div>
563
564<!-- ======================================================================= -->
565<div class="doc_subsection">
566 <a name="x86-be">Known problems with the X86 back-end</a>
567</div>
568
569<div class="doc_text">
570
571<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]572
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]573<li>The X86 code generator <a
Chris Lattner0d4379a2003-10-08 06:01:38 +0000[diff] [blame]574href="http://llvm.cs.uiuc.edu/PR16">does not currently
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]575support the <tt>unwind</tt> instruction</a>, so code that throws a C++ exception
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]576or calls the C <tt>longjmp</tt> function will abort.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]577
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]578</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]579
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]580</div>
581
582<!-- ======================================================================= -->
583<div class="doc_subsection">
584 <a name="sparc-be">Known problems with the Sparc back-end</a>
585</div>
586
587<div class="doc_text">
588
589<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]590
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]591<li>The Sparc code generator <a
Chris Lattner0d4379a2003-10-08 06:01:38 +0000[diff] [blame]592href="http://llvm.cs.uiuc.edu/PR15">does not currently
Chris Lattnerfcc54b32003-10-07 22:14:37 +0000[diff] [blame]593support the <tt>unwind</tt> instruction</a>, so code that throws a C++ exception
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]594or calls the C <tt>longjmp</tt> function will abort.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]595
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]596</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]597
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]598</div>
599
600<!-- ======================================================================= -->
601<div class="doc_subsection">
602 <a name="c-be">Known problems with the C back-end</a>
603</div>
604
605<div class="doc_text">
606
607<ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]608
609<li>The C back-end produces code that violates the ANSI C Type-Based Alias
610Analysis rules. As such, special options may be necessary to compile the code
611(for example, GCC requires the <tt>-fno-strict-aliasing</tt> option). This
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]612problem probably cannot be fixed.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]613
Chris Lattnere84843b2003-10-20 19:05:03 +0000[diff] [blame]614<li><a href="http://llvm.cs.uiuc.edu/PR33">Initializers for global variables</a>
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]615cannot include special floating point numbers like Not-A-Number or
616Infinity.</li>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]617
Chris Lattner2855ecd2003-11-04 20:06:53 +0000[diff] [blame]618<li><a href="http://llvm.cs.uiuc.edu/PR56">Zero arg vararg functions are not
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]619supported</a>. This should not affect LLVM produced by the C or C++
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]620frontends.</li>
Chris Lattner2af46052003-10-24 04:03:19 +0000[diff] [blame]621
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]622</ul>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]623
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]624</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]625
626<!-- *********************************************************************** -->
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]627<div class="doc_section">
628 <a name="additionalinfo">Additional Information</a>
629</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]630<!-- *********************************************************************** -->
631
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]632<div class="doc_text">
633
634<p>A wide variety of additional information is available on the LLVM web page,
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]635including mailing lists publications describing algorithms and components
636implemented in LLVM. The web page also contains versions of the API
637documentation which is up-to-date with the CVS version of the source code. You
638can access versions of these documents specific to this release by going into
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]639the "<tt>llvm/doc/</tt>" directory in the LLVM tree.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]640
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]641<p>If you have any questions or comments about LLVM, please feel free to contact
642us via the mailing lists.</p>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]643
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]644</div>
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]645
646<!-- *********************************************************************** -->
Chris Lattner79c3fe12003-10-02 04:57:28 +0000[diff] [blame]647
Misha Brukman500bc302003-11-22 00:38:41 +0000[diff] [blame]648<hr>
Misha Brukman2061e892003-11-22 01:23:39 +0000[diff] [blame]649<address>
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654
Misha Brukmane0c891c2003-11-22 01:00:11 +0000[diff] [blame]655 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
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