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gerrit-public.fairphone.software / platform / external / llvm / 43a699a112c7ac988e25111a3849fa1d73e3b51c / . / docs / ExtendingLLVM.html
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NAKAMURA Takumi5c6e4df2011-10-31 11:21:59 +0000[diff] [blame]5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]6 <title>Extending LLVM: Adding instructions, intrinsics, types, etc.</title>
Daniel Dunbaradea4972012-04-19 20:20:34 +0000[diff] [blame]7 <link rel="stylesheet" href="_static/llvm.css" type="text/css">
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]8</head>
9
10<body>
11
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]12<h1>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]13 Extending LLVM: Adding instructions, intrinsics, types, etc.
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]14</h1>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]15
16<ol>
17 <li><a href="#introduction">Introduction and Warning</a></li>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]18 <li><a href="#intrinsic">Adding a new intrinsic function</a></li>
Chris Lattner36365402004-04-09 19:24:20 +0000[diff] [blame]19 <li><a href="#instruction">Adding a new instruction</a></li>
Nate Begeman099d76c2006-01-16 07:54:23 +0000[diff] [blame]20 <li><a href="#sdnode">Adding a new SelectionDAG node</a></li>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]21 <li><a href="#type">Adding a new type</a>
22 <ol>
23 <li><a href="#fund_type">Adding a new fundamental type</a></li>
24 <li><a href="#derived_type">Adding a new derived type</a></li>
25 </ol></li>
26</ol>
27
Chris Lattner7911ce22004-05-23 21:07:27 +0000[diff] [blame]28<div class="doc_author">
Chris Lattner5eb9f0d2005-05-11 03:53:53 +0000[diff] [blame]29 <p>Written by <a href="http://misha.brukman.net">Misha Brukman</a>,
Chris Lattnerb5f6e252006-01-16 16:31:40 +0000[diff] [blame]30 Brad Jones, Nate Begeman,
31 and <a href="http://nondot.org/sabre">Chris Lattner</a></p>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]32</div>
33
34<!-- *********************************************************************** -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]35<h2>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]36 <a name="introduction">Introduction and Warning</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]37</h2>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]38<!-- *********************************************************************** -->
39
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]40<div>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]41
42<p>During the course of using LLVM, you may wish to customize it for your
43research project or for experimentation. At this point, you may realize that
44you need to add something to LLVM, whether it be a new fundamental type, a new
45intrinsic function, or a whole new instruction.</p>
46
47<p>When you come to this realization, stop and think. Do you really need to
48extend LLVM? Is it a new fundamental capability that LLVM does not support at
49its current incarnation or can it be synthesized from already pre-existing LLVM
50elements? If you are not sure, ask on the <a
51href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM-dev</a> list. The
52reason is that extending LLVM will get involved as you need to update all the
53different passes that you intend to use with your extension, and there are
54<em>many</em> LLVM analyses and transformations, so it may be quite a bit of
55work.</p>
56
Chris Lattner35dd5b02006-04-12 17:42:39 +0000[diff] [blame]57<p>Adding an <a href="#intrinsic">intrinsic function</a> is far easier than
58adding an instruction, and is transparent to optimization passes. If your added
59functionality can be expressed as a
Misha Brukmanb3b28272004-04-06 04:17:51 +0000[diff] [blame]60function call, an intrinsic function is the method of choice for LLVM
61extension.</p>
62
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]63<p>Before you invest a significant amount of effort into a non-trivial
64extension, <span class="doc_warning">ask on the list</span> if what you are
65looking to do can be done with already-existing infrastructure, or if maybe
66someone else is already working on it. You will save yourself a lot of time and
67effort by doing so.</p>
68
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]69</div>
70
71<!-- *********************************************************************** -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]72<h2>
Chris Lattner36365402004-04-09 19:24:20 +0000[diff] [blame]73 <a name="intrinsic">Adding a new intrinsic function</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]74</h2>
Chris Lattner36365402004-04-09 19:24:20 +0000[diff] [blame]75<!-- *********************************************************************** -->
76
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]77<div>
Chris Lattner36365402004-04-09 19:24:20 +0000[diff] [blame]78
79<p>Adding a new intrinsic function to LLVM is much easier than adding a new
80instruction. Almost all extensions to LLVM should start as an intrinsic
81function and then be turned into an instruction if warranted.</p>
82
83<ol>
84<li><tt>llvm/docs/LangRef.html</tt>:
85 Document the intrinsic. Decide whether it is code generator specific and
86 what the restrictions are. Talk to other people about it so that you are
87 sure it's a good idea.</li>
88
Chris Lattner35dd5b02006-04-12 17:42:39 +0000[diff] [blame]89<li><tt>llvm/include/llvm/Intrinsics*.td</tt>:
90 Add an entry for your intrinsic. Describe its memory access characteristics
Reid Spencerc8d06362007-04-01 07:44:52 +0000[diff] [blame]91 for optimization (this controls whether it will be DCE'd, CSE'd, etc). Note
92 that any intrinsic using the <tt>llvm_int_ty</tt> type for an argument will
93 be deemed by <tt>tblgen</tt> as overloaded and the corresponding suffix
94 will be required on the intrinsic's name.</li>
Chris Lattner0190fdb2004-04-10 06:56:53 +0000[diff] [blame]95
Nate Begeman2f86c222006-01-14 01:27:10 +0000[diff] [blame]96<li><tt>llvm/lib/Analysis/ConstantFolding.cpp</tt>: If it is possible to
97 constant fold your intrinsic, add support to it in the
98 <tt>canConstantFoldCallTo</tt> and <tt>ConstantFoldCall</tt> functions.</li>
99
Nate Begeman099d76c2006-01-16 07:54:23 +0000[diff] [blame]100<li><tt>llvm/test/Regression/*</tt>: Add test cases for your test cases to the
101 test suite</li>
Chris Lattner36365402004-04-09 19:24:20 +0000[diff] [blame]102</ol>
103
Chris Lattner5eb9f0d2005-05-11 03:53:53 +0000[diff] [blame]104<p>Once the intrinsic has been added to the system, you must add code generator
105support for it. Generally you must do the following steps:</p>
106
107<dl>
Chris Lattner5eb9f0d2005-05-11 03:53:53 +0000[diff] [blame]108
Chris Lattner35dd5b02006-04-12 17:42:39 +0000[diff] [blame]109<dt>Add support to the .td file for the target(s) of your choice in
110 <tt>lib/Target/*/*.td</tt>.</dt>
Chris Lattner5eb9f0d2005-05-11 03:53:53 +0000[diff] [blame]111
Chris Lattner35dd5b02006-04-12 17:42:39 +0000[diff] [blame]112<dd>This is usually a matter of adding a pattern to the .td file that matches
113 the intrinsic, though it may obviously require adding the instructions you
114 want to generate as well. There are lots of examples in the PowerPC and X86
115 backend to follow.</dd>
Bill Wendling068da272007-09-22 10:07:00 +0000[diff] [blame]116</dl>
Chris Lattner5eb9f0d2005-05-11 03:53:53 +0000[diff] [blame]117
Nate Begeman099d76c2006-01-16 07:54:23 +0000[diff] [blame]118</div>
Chris Lattner5eb9f0d2005-05-11 03:53:53 +0000[diff] [blame]119
Nate Begeman099d76c2006-01-16 07:54:23 +0000[diff] [blame]120<!-- *********************************************************************** -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]121<h2>
Nate Begeman099d76c2006-01-16 07:54:23 +0000[diff] [blame]122 <a name="sdnode">Adding a new SelectionDAG node</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]123</h2>
Nate Begeman099d76c2006-01-16 07:54:23 +0000[diff] [blame]124<!-- *********************************************************************** -->
Chris Lattner5eb9f0d2005-05-11 03:53:53 +0000[diff] [blame]125
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]126<div>
Chris Lattner5eb9f0d2005-05-11 03:53:53 +0000[diff] [blame]127
Nate Begeman099d76c2006-01-16 07:54:23 +0000[diff] [blame]128<p>As with intrinsics, adding a new SelectionDAG node to LLVM is much easier
129than adding a new instruction. New nodes are often added to help represent
130instructions common to many targets. These nodes often map to an LLVM
131instruction (add, sub) or intrinsic (byteswap, population count). In other
132cases, new nodes have been added to allow many targets to perform a common task
133(converting between floating point and integer representation) or capture more
134complicated behavior in a single node (rotate).</p>
Chris Lattner5eb9f0d2005-05-11 03:53:53 +0000[diff] [blame]135
Nate Begeman099d76c2006-01-16 07:54:23 +0000[diff] [blame]136<ol>
Duncan Sandseb7fe5d2011-06-30 06:37:07 +0000[diff] [blame]137<li><tt>include/llvm/CodeGen/ISDOpcodes.h</tt>:
Nate Begeman099d76c2006-01-16 07:54:23 +0000[diff] [blame]138 Add an enum value for the new SelectionDAG node.</li>
139<li><tt>lib/CodeGen/SelectionDAG/SelectionDAG.cpp</tt>:
140 Add code to print the node to <tt>getOperationName</tt>. If your new node
141 can be evaluated at compile time when given constant arguments (such as an
142 add of a constant with another constant), find the <tt>getNode</tt> method
143 that takes the appropriate number of arguments, and add a case for your node
144 to the switch statement that performs constant folding for nodes that take
145 the same number of arguments as your new node.</li>
146<li><tt>lib/CodeGen/SelectionDAG/LegalizeDAG.cpp</tt>:
147 Add code to <a href="CodeGenerator.html#selectiondag_legalize">legalize,
148 promote, and expand</a> the node as necessary. At a minimum, you will need
149 to add a case statement for your node in <tt>LegalizeOp</tt> which calls
150 LegalizeOp on the node's operands, and returns a new node if any of the
151 operands changed as a result of being legalized. It is likely that not all
152 targets supported by the SelectionDAG framework will natively support the
153 new node. In this case, you must also add code in your node's case
154 statement in <tt>LegalizeOp</tt> to Expand your node into simpler, legal
Chris Lattnerb5f6e252006-01-16 16:31:40 +0000[diff] [blame]155 operations. The case for <tt>ISD::UREM</tt> for expanding a remainder into
156 a divide, multiply, and a subtract is a good example.</li>
Nate Begeman099d76c2006-01-16 07:54:23 +0000[diff] [blame]157<li><tt>lib/CodeGen/SelectionDAG/LegalizeDAG.cpp</tt>:
158 If targets may support the new node being added only at certain sizes, you
159 will also need to add code to your node's case statement in
160 <tt>LegalizeOp</tt> to Promote your node's operands to a larger size, and
161 perform the correct operation. You will also need to add code to
Chris Lattnerb5f6e252006-01-16 16:31:40 +0000[diff] [blame]162 <tt>PromoteOp</tt> to do this as well. For a good example, see
163 <tt>ISD::BSWAP</tt>,
Nate Begeman099d76c2006-01-16 07:54:23 +0000[diff] [blame]164 which promotes its operand to a wider size, performs the byteswap, and then
165 shifts the correct bytes right to emulate the narrower byteswap in the
166 wider type.</li>
167<li><tt>lib/CodeGen/SelectionDAG/LegalizeDAG.cpp</tt>:
168 Add a case for your node in <tt>ExpandOp</tt> to teach the legalizer how to
169 perform the action represented by the new node on a value that has been
170 split into high and low halves. This case will be used to support your
171 node with a 64 bit operand on a 32 bit target.</li>
172<li><tt>lib/CodeGen/SelectionDAG/DAGCombiner.cpp</tt>:
173 If your node can be combined with itself, or other existing nodes in a
174 peephole-like fashion, add a visit function for it, and call that function
175 from <tt></tt>. There are several good examples for simple combines you
176 can do; <tt>visitFABS</tt> and <tt>visitSRL</tt> are good starting places.
177 </li>
178<li><tt>lib/Target/PowerPC/PPCISelLowering.cpp</tt>:
179 Each target has an implementation of the <tt>TargetLowering</tt> class,
180 usually in its own file (although some targets include it in the same
181 file as the DAGToDAGISel). The default behavior for a target is to
182 assume that your new node is legal for all types that are legal for
183 that target. If this target does not natively support your node, then
184 tell the target to either Promote it (if it is supported at a larger
185 type) or Expand it. This will cause the code you wrote in
186 <tt>LegalizeOp</tt> above to decompose your new node into other legal
187 nodes for this target.</li>
188<li><tt>lib/Target/TargetSelectionDAG.td</tt>:
189 Most current targets supported by LLVM generate code using the DAGToDAG
190 method, where SelectionDAG nodes are pattern matched to target-specific
191 nodes, which represent individual instructions. In order for the targets
192 to match an instruction to your new node, you must add a def for that node
193 to the list in this file, with the appropriate type constraints. Look at
194 <tt>add</tt>, <tt>bswap</tt>, and <tt>fadd</tt> for examples.</li>
195<li><tt>lib/Target/PowerPC/PPCInstrInfo.td</tt>:
196 Each target has a tablegen file that describes the target's instruction
197 set. For targets that use the DAGToDAG instruction selection framework,
198 add a pattern for your new node that uses one or more target nodes.
199 Documentation for this is a bit sparse right now, but there are several
200 decent examples. See the patterns for <tt>rotl</tt> in
201 <tt>PPCInstrInfo.td</tt>.</li>
202<li>TODO: document complex patterns.</li>
203<li><tt>llvm/test/Regression/CodeGen/*</tt>: Add test cases for your new node
204 to the test suite. <tt>llvm/test/Regression/CodeGen/X86/bswap.ll</tt> is
205 a good example.</li>
206</ol>
Chris Lattner36365402004-04-09 19:24:20 +0000[diff] [blame]207
208</div>
209
210<!-- *********************************************************************** -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]211<h2>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]212 <a name="instruction">Adding a new instruction</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]213</h2>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]214<!-- *********************************************************************** -->
215
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]216<div>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]217
Gabor Greif04367bf2007-07-06 22:07:22 +0000[diff] [blame]218<p><span class="doc_warning">WARNING: adding instructions changes the bitcode
Misha Brukmanb3b28272004-04-06 04:17:51 +0000[diff] [blame]219format, and it will take some effort to maintain compatibility with
220the previous version.</span> Only add an instruction if it is absolutely
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]221necessary.</p>
222
223<ol>
Misha Brukmanb3b28272004-04-06 04:17:51 +0000[diff] [blame]224
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]225<li><tt>llvm/include/llvm/Instruction.def</tt>:
226 add a number for your instruction and an enum name</li>
227
Misha Brukman47b14a42004-07-29 17:30:56 +0000[diff] [blame]228<li><tt>llvm/include/llvm/Instructions.h</tt>:
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]229 add a definition for the class that will represent your instruction</li>
230
231<li><tt>llvm/include/llvm/Support/InstVisitor.h</tt>:
232 add a prototype for a visitor to your new instruction type</li>
233
234<li><tt>llvm/lib/AsmParser/Lexer.l</tt>:
235 add a new token to parse your instruction from assembly text file</li>
236
237<li><tt>llvm/lib/AsmParser/llvmAsmParser.y</tt>:
238 add the grammar on how your instruction can be read and what it will
239 construct as a result</li>
240
Gabor Greif04367bf2007-07-06 22:07:22 +0000[diff] [blame]241<li><tt>llvm/lib/Bitcode/Reader/Reader.cpp</tt>:
242 add a case for your instruction and how it will be parsed from bitcode</li>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]243
244<li><tt>llvm/lib/VMCore/Instruction.cpp</tt>:
245 add a case for how your instruction will be printed out to assembly</li>
246
Chris Lattner8f363212004-07-29 17:31:57 +0000[diff] [blame]247<li><tt>llvm/lib/VMCore/Instructions.cpp</tt>:
Misha Brukmane39cd632004-09-28 16:58:12 +0000[diff] [blame]248 implement the class you defined in
249 <tt>llvm/include/llvm/Instructions.h</tt></li>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]250
Misha Brukmana4242282004-12-01 20:58:54 +0000[diff] [blame]251<li>Test your instruction</li>
252
253<li><tt>llvm/lib/Target/*</tt>:
254 Add support for your instruction to code generators, or add a lowering
255 pass.</li>
256
257<li><tt>llvm/test/Regression/*</tt>: add your test cases to the test suite.</li>
258
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]259</ol>
260
261<p>Also, you need to implement (or modify) any analyses or passes that you want
262to understand this new instruction.</p>
263
264</div>
265
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]266
267<!-- *********************************************************************** -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]268<h2>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]269 <a name="type">Adding a new type</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]270</h2>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]271<!-- *********************************************************************** -->
272
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]273<div>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]274
Gabor Greif04367bf2007-07-06 22:07:22 +0000[diff] [blame]275<p><span class="doc_warning">WARNING: adding new types changes the bitcode
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]276format, and will break compatibility with currently-existing LLVM
277installations.</span> Only add new types if it is absolutely necessary.</p>
278
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]279<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]280<h3>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]281 <a name="fund_type">Adding a fundamental type</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]282</h3>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]283
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]284<div>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]285
286<ol>
287
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]288<li><tt>llvm/include/llvm/Type.h</tt>:
Chris Lattner55f95012005-04-23 21:59:11 +0000[diff] [blame]289 add enum for the new type; add static <tt>Type*</tt> for this type</li>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]290
291<li><tt>llvm/lib/VMCore/Type.cpp</tt>:
292 add mapping from <tt>TypeID</tt> =&gt; <tt>Type*</tt>;
293 initialize the static <tt>Type*</tt></li>
294
295<li><tt>llvm/lib/AsmReader/Lexer.l</tt>:
296 add ability to parse in the type from text assembly</li>
297
298<li><tt>llvm/lib/AsmReader/llvmAsmParser.y</tt>:
299 add a token for that type</li>
300
301</ol>
302
303</div>
304
305<!-- ======================================================================= -->
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]306<h3>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]307 <a name="derived_type">Adding a derived type</a>
NAKAMURA Takumi05d02652011-04-18 23:59:50 +0000[diff] [blame]308</h3>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]309
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]310<div>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]311
Chris Lattner8dad40c2004-08-12 19:06:24 +0000[diff] [blame]312<ol>
Chris Lattner8dad40c2004-08-12 19:06:24 +0000[diff] [blame]313<li><tt>llvm/include/llvm/Type.h</tt>:
Chris Lattner55f95012005-04-23 21:59:11 +0000[diff] [blame]314 add enum for the new type; add a forward declaration of the type
Misha Brukman7cc8a892004-08-12 19:58:43 +0000[diff] [blame]315 also</li>
Chris Lattner8dad40c2004-08-12 19:06:24 +0000[diff] [blame]316
Chris Lattner47746aa2005-11-13 02:09:55 +0000[diff] [blame]317<li><tt>llvm/include/llvm/DerivedTypes.h</tt>:
Chris Lattner8dad40c2004-08-12 19:06:24 +0000[diff] [blame]318 add new class to represent new class in the hierarchy; add forward
319 declaration to the TypeMap value type</li>
320
321<li><tt>llvm/lib/VMCore/Type.cpp</tt>:
322 add support for derived type to:
Misha Brukman7cc8a892004-08-12 19:58:43 +0000[diff] [blame]323<div class="doc_code">
324<pre>
325std::string getTypeDescription(const Type &amp;Ty,
326 std::vector&lt;const Type*&gt; &amp;TypeStack)
327bool TypesEqual(const Type *Ty, const Type *Ty2,
328 std::map&lt;const Type*, const Type*&gt; &amp; EqTypes)
329</pre>
330</div>
331 add necessary member functions for type, and factory methods</li>
Chris Lattner8dad40c2004-08-12 19:06:24 +0000[diff] [blame]332
333<li><tt>llvm/lib/AsmReader/Lexer.l</tt>:
334 add ability to parse in the type from text assembly</li>
335
Gabor Greif04367bf2007-07-06 22:07:22 +0000[diff] [blame]336<li><tt>llvm/lib/BitCode/Writer/Writer.cpp</tt>:
337 modify <tt>void BitcodeWriter::outputType(const Type *T)</tt> to serialize
Misha Brukman7cc8a892004-08-12 19:58:43 +0000[diff] [blame]338 your type</li>
Chris Lattner8dad40c2004-08-12 19:06:24 +0000[diff] [blame]339
Gabor Greif04367bf2007-07-06 22:07:22 +0000[diff] [blame]340<li><tt>llvm/lib/BitCode/Reader/Reader.cpp</tt>:
341 modify <tt>const Type *BitcodeReader::ParseType()</tt> to read your data
Misha Brukman7cc8a892004-08-12 19:58:43 +0000[diff] [blame]342 type</li>
Chris Lattner8dad40c2004-08-12 19:06:24 +0000[diff] [blame]343
344<li><tt>llvm/lib/VMCore/AsmWriter.cpp</tt>:
Misha Brukman7cc8a892004-08-12 19:58:43 +0000[diff] [blame]345 modify
346<div class="doc_code">
347<pre>
348void calcTypeName(const Type *Ty,
349 std::vector&lt;const Type*&gt; &amp;TypeStack,
350 std::map&lt;const Type*,std::string&gt; &amp;TypeNames,
351 std::string &amp; Result)
352</pre>
353</div>
Chris Lattner8dad40c2004-08-12 19:06:24 +0000[diff] [blame]354 to output the new derived type
355</li>
356
357
358</ol>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]359
360</div>
361
NAKAMURA Takumif5af6ad2011-04-23 00:30:22 +0000[diff] [blame]362</div>
363
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]364<!-- *********************************************************************** -->
365
366<hr>
367<address>
368 <a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]372
NAKAMURA Takumib9a33632011-04-09 02:13:37 +0000[diff] [blame]373 <a href="http://llvm.org/">The LLVM Compiler Infrastructure</a>
Misha Brukmana3ce4292004-04-06 03:53:49 +0000[diff] [blame]374 <br>
375 Last modified: $Date$
376</address>
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