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5 <title>TableGen Fundamentals</title>
6 <link rel="stylesheet" href="llvm.css" type="text/css">
7</head>
8<body>
9
10<div class="doc_title">TableGen Fundamentals</div>
11
12<ul>
13 <li><a href="#introduction">Introduction</a></li>
14 <ol>
15 <li><a href="#concepts">Basic concepts</a></li>
16 <li><a href="#example">An example record</a></li>
17 <li><a href="#running">Running TableGen</a></li>
18 </ol>
19 <li><a href="#syntax">TableGen syntax</a></li>
20 <ol>
21 <li><a href="#primitives">TableGen primitives</a></li>
22 <ol>
23 <li><a href="#comments">TableGen comments</a></li>
24 <li><a href="#types">The TableGen type system</a></li>
25 <li><a href="#values">TableGen values and expressions</a></li>
26 </ol>
27 <li><a href="#classesdefs">Classes and definitions</a></li>
28 <ol>
29 <li><a href="#valuedef">Value definitions</a></li>
30 <li><a href="#recordlet">'let' expressions</a></li>
31 <li><a href="#templateargs">Class template arguments</a></li>
32 </ol>
33 <li><a href="#filescope">File scope entities</a></li>
34 <ol>
35 <li><a href="#include">File inclusion</a></li>
36 <li><a href="#globallet">'let' expressions</a></li>
37 </ol>
38 </ol>
39 <li><a href="#backends">TableGen backends</a></li>
40 <ol>
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]41 <li><a href="#">todo</a></li>
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]42 </ol>
43 <li><a href="#codegenerator">The LLVM code generator</a></li>
44 <ol>
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]45 <li><a href="#">todo</a></li>
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]46 </ol>
47</ul>
48
49<!-- *********************************************************************** -->
50<div class="doc_section"><a name="introduction">Introduction</a></div>
51<!-- *********************************************************************** -->
52
53<div class="doc_text">
54
55<p>TableGen's purpose is to help a human develop and maintain records of
56domain-specific information. Because there may be a large number of these
57records, it is specifically designed to allow writing flexible descriptions and
58for common features of these records to be factored out. This reduces the
59amount of duplication in the description, reduces the chance of error, and
60makes it easier to structure domain specific information.</p>
61
62<p>The core part of TableGen <a href="#syntax">parses a file</a>, instantiates
63the declarations, and hands the result off to a domain-specific "<a
64href="#backends">TableGen backend</a>" for processing. The current major user
65of TableGen is the <a href="#codegenerator">LLVM code generator</a>.
66</p>
67
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]68<p>
69Note that if you work on TableGen much, and use emacs or vim, that you can find
70an emacs "TableGen mode" and a vim language file in <tt>llvm/utils/emacs</tt>
71and <tt>llvm/utils/vim</tt> directory of your LLVM distribution, respectively.
72</p>
73
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]74</div>
75
76<!-- ======================================================================= -->
77<div class="doc_subsection">
78 <a name="running">Basic concepts</a>
79</div>
80
81<div class="doc_text">
82
83<p>
84TableGen files consist of two key parts: 'classes' and 'definitions', both of
85which are considered 'records'.
86</p>
87
88<p>
89<b>TableGen records</b> have a unique name, a list of values, and a list of
90superclasses. The list of values is main data that TableGen builds for each
91record, it is this that holds the domain specific information for the
92application. The interpretation of this data is left to a specific <a
93href="#backends">TableGen backend</a>, but the structure and format rules are
94taken care of and fixed by TableGen.
95</p>
96
97<p>
98<b>TableGen definitions</b> are the concrete form of 'records'. These generally
99do not have any undefined values, and are marked with the '<tt>def</tt>'
100keyword.
101</p>
102
103<p>
104<b>TableGen classes</b> are abstract records that are used to build and describe
105other records. These 'classes' allow the end-user to build abstractions for
106either the domain they are targetting (such as "Register", "RegisterClass", and
107"Instruction" in the LLVM code generator) or for the implementor to help factor
108out common properties of records (such as "FPInst", which is used to represent
109floating point instructions in the X86 backend). TableGen keeps track of all of
110the classes that are used to build up a definition, so the backend can find all
111definitions of a particular class, such as "Instruction".
112</p>
113
114</div>
115
116<!-- ======================================================================= -->
117<div class="doc_subsection">
118 <a name="example">An example record</a>
119</div>
120
121<div class="doc_text">
122
123<p>
124With no other arguments, TableGen parses the specified file and prints out all
125of the classes, then all of the definitions. This is a good way to see what the
126various definitions expand to fully. Running this on the <tt>X86.td</tt> file
127prints this (at the time of this writing):
128</p>
129
130<p>
131<pre>
132...
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]133<b>def</b> ADDrr8 { <i>// Instruction X86Inst I2A8 Pattern</i>
134 <b>string</b> Name = "add";
135 <b>string</b> Namespace = "X86";
136 <b>list</b>&lt;Register&gt; Uses = [];
137 <b>list</b>&lt;Register&gt; Defs = [];
138 <b>bit</b> isReturn = 0;
139 <b>bit</b> isBranch = 0;
140 <b>bit</b> isCall = 0;
141 <b>bit</b> isTwoAddress = 1;
142 <b>bit</b> isTerminator = 0;
143 <b>dag</b> Pattern = (set R8, (plus R8, R8));
144 <b>bits</b>&lt;8&gt; Opcode = { 0, 0, 0, 0, 0, 0, 0, 0 };
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]145 Format Form = MRMDestReg;
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]146 <b>bits</b>&lt;5&gt; FormBits = { 0, 0, 0, 1, 1 };
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]147 ArgType Type = Arg8;
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]148 <b>bits</b>&lt;3&gt; TypeBits = { 0, 0, 1 };
149 <b>bit</b> hasOpSizePrefix = 0;
150 <b>bit</b> printImplicitUses = 0;
151 <b>bits</b>&lt;4&gt; Prefix = { 0, 0, 0, 0 };
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]152 FPFormat FPForm = ?;
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]153 <b>bits</b>&lt;3&gt; FPFormBits = { 0, 0, 0 };
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]154}
155...
156</pre><p>
157
158<p>
159This definition corresponds to an 8-bit register-register add instruction in the
160X86. The string after the '<tt>def</tt>' string indicates the name of the
161record ("<tt>ADDrr8</tt>" in this case), and the comment at the end of the line
162indicates the superclasses of the definition. The body of the record contains
163all of the data that TableGen assembled for the record, indicating that the
164instruction is part of the "X86" namespace, should be printed as "<tt>add</tt>"
165in the assembly file, it is a two-address instruction, has a particular
166encoding, etc. The contents and semantics of the information in the record is
167specific to the needs of the X86 backend, and is only shown as an example.
168</p>
169
170<p>
171As you can see, a lot of information is needed for every instruction supported
172by the code generator, and specifying it all manually would be unmaintainble,
173prone to bugs, and tiring to do in the first place. Because we are using
174TableGen, all of the information was derived from the following definition:
175</p>
176
177<p><pre>
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]178<b>def</b> ADDrr8 : I2A8&lt;"add", 0x00, MRMDestReg&gt;,
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]179 Pattern&lt;(set R8, (plus R8, R8))&gt;;
180</pre></p>
181
182<p>
183This definition makes use of the custom I2A8 (two address instruction with 8-bit
184operand) class, which is defined in the X86-specific TableGen file to factor out
185the common features that instructions of its class share. A key feature of
186TableGen is that it allows the end-user to define the abstractions they prefer
187to use when describing their information.
188</p>
189
190</div>
191
192<!-- ======================================================================= -->
193<div class="doc_subsection">
194 <a name="running">Running TableGen</a>
195</div>
196
197<div class="doc_text">
198
199<p>
200TableGen runs just like any other LLVM tool. The first (optional) argument
201specifies the file to read. If a filename is not specified, <tt>tblgen</tt>
202reads from standard input.
203</p>
204
205<p>
206To be useful, one of the <a href="#backends">TableGen backends</a> must be used.
207These backends are selectable on the command line (type '<tt>tblgen --help</tt>'
208for a list). For example, to get a list of all of the definitions that subclass
209a particular type (which can be useful for building up an enum list of these
210records), use the <tt>--print-enums</tt> option:
211</p>
212
213<p><pre>
214$ tblgen X86.td -print-enums -class=Register
215AH, AL, AX, BH, BL, BP, BX, CH, CL, CX, DH, DI, DL, DX,
216EAX, EBP, EBX, ECX, EDI, EDX, ESI, ESP, FP0, FP1, FP2, FP3, FP4, FP5, FP6,
217SI, SP, ST0, ST1, ST2, ST3, ST4, ST5, ST6, ST7,
218
219$ tblgen X86.td -print-enums -class=Instruction
220ADCrr32, ADDri16, ADDri16b, ADDri32, ADDri32b, ADDri8, ADDrr16, ADDrr32,
221ADDrr8, ADJCALLSTACKDOWN, ADJCALLSTACKUP, ANDri16, ANDri16b, ANDri32, ANDri32b,
222ANDri8, ANDrr16, ANDrr32, ANDrr8, BSWAPr32, CALLm32, CALLpcrel32, ...
223</pre></p>
224
225<p>
226The default backend prints out all of the records, as described <a
227href="#example">above</a>.
228</p>
229
230<p>
231If you plan to use TableGen for some purpose, you will most likely have to <a
232href="#backends">write a backend</a> that extracts the information specific to
233what you need and formats it in the appropriate way.
234</p>
235
236</div>
237
238
239<!-- *********************************************************************** -->
240<div class="doc_section"><a name="syntax">TableGen syntax</a></div>
241<!-- *********************************************************************** -->
242
243<div class="doc_text">
244
245<p>
246TableGen doesn't care about the meaning of data (that is up to the backend to
247define), but it does care about syntax, and it enforces a simple type system.
248This section describes the syntax and the constructs allowed in a TableGen file.
249</p>
250
251</div>
252
253<!-- ======================================================================= -->
254<div class="doc_subsection">
255 <a name="primitives">TableGen primitives</tt></a>
256</div>
257
258<!----------------------------------------------------------------------------->
259<div class="doc_subsubsection">
260 <a name="comments">TableGen comments</tt></a>
261</div>
262
263<div class="doc_text">
264
265<p>TableGen supports BCPL style "<tt>//</tt>" comments, which run to the end of
266the line, and it also supports <b>nestable</b> "<tt>/* */</tt>" comments.</p>
267
268</div>
269
270
271<!----------------------------------------------------------------------------->
272<div class="doc_subsubsection">
273 <a name="types">The TableGen type system</tt></a>
274</div>
275
276<div class="doc_text">
277<p>
278TableGen files are strongly typed, in a simple (but complete) type-system.
279These types are used to perform automatic conversions, check for errors, and to
280help interface designers constrain the input that they allow. Every <a
281href="#valuedef">value definition</a> is required to have an associated type.
282</p>
283
284<p>
285TableGen supports a mixture of very low-level types (such as <tt>bit</tt>) and
286very high-level types (such as <tt>dag</tt>). This flexibility is what allows
287it to describe a wide range of information conveniently and compactly. The
288TableGen types are:
289</p>
290
291<p>
292<ul>
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]293<li>"<tt><b>bit</b></tt>" - A 'bit' is a boolean value that can hold either 0 or
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]2941.</li>
295
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]296<li>"<tt><b>int</b></tt>" - The 'int' type represents a simple 32-bit integer
297value, such as 5.</li>
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]298
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]299<li>"<tt><b>string</b></tt>" - The 'string' type represents an ordered sequence
300of characters of arbitrary length.</li>
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]301
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]302<li>"<tt><b>bits</b>&lt;n&gt;</tt>" - A 'bits' type is a arbitrary, but fixed,
303size integer that is broken up into individual bits. This type is useful
304because it can handle some bits being defined while others are undefined.</li>
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]305
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]306<li>"<tt><b>list</b>&lt;ty&gt;</tt>" - This type represents a list whose
307elements are some other type. The contained type is arbitrary: it can even be
308another list type.</li>
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]309
310<li>Class type - Specifying a class name in a type context means that the
311defined value must be a subclass of the specified class. This is useful in
312conjunction with the "list" type, for example, to constrain the elements of the
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]313list to a common base class (e.g., a <tt><b>list</b>&lt;Register&gt;</tt> can
314only contain definitions derived from the "<tt>Register</tt>" class).</li>
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]315
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]316<li>"<tt><b>code</b></tt>" - This represents a big hunk of text. NOTE: I don't
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]317remember why this is distinct from string!</li>
318
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]319<li>"<tt><b>dag</b></tt>" - This type represents a nestable directed graph of
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]320elements.</li>
321</ul>
322</p>
323
324<p>
325To date, these types have been sufficient for describing things that TableGen
326has been used for, but it is straight-forward to extend this list if needed.
327</p>
328
329</div>
330
331<!----------------------------------------------------------------------------->
332<div class="doc_subsubsection">
333 <a name="values">TableGen values and expressions</tt></a>
334</div>
335
336<div>
337<p>
338TableGen allows for a pretty reasonable number of different expression forms
339when building up values. These forms allow the TableGen file to be written in a
340natural syntax and flavor for the application. The current expression forms
341supported include:
342</p>
343
344<p><ul>
345<li>? - Uninitialized field.</li>
346<li>0b1001011 - Binary integer value.</li>
347<li>07654321 - Octal integer value (indicated by a leading 0).</li>
348<li>7 - Decimal integer value.</li>
349<li>0x7F - Hexadecimal integer value.</li>
350<li>"foo" - String value.</li>
351<li>[{ .... }] - Code fragment.</li>
352<li>[ X, Y, Z ] - List value.</li>
353<li>{ a, b, c } - Initializer for a "bits&lt;3&gt;" value.</li>
354<li>value - Value reference.</li>
355<li>value{17} - Access to one or more bits of a value.</li>
356<li>DEF - Reference to a record definition.</li>
357<li>X.Y - Reference to the subfield of a value.</li>
358
359<li>(DEF a, b) - A dag value. The first element is required to be a record
360definition, the remaining elements in the list may be arbitrary other values,
361including nested 'dag' values.</li>
362
363</ul></p>
364
365<p>
366Note that all of the values have rules specifying how they convert to to values
367for different types. These rules allow you to assign a value like "7" to a
368"bits&lt;4&gt;" value, for example.
369</p>
370
371
372
373</div>
374
375
376<!-- ======================================================================= -->
377<div class="doc_subsection">
378 <a name="classesdefs">Classes and definitions</tt></a>
379</div>
380
381<div>
382<p>
383As mentioned in the <a href="#concepts">intro</a>, classes and definitions
384(collectively known as 'records') in TableGen are the main high-level unit of
385information that TableGen collects. Records are defined with a <tt>def</tt> or
386<tt>class</tt> keyword, the record name, and an optional list of "<a
387href="templateargs">template arguments</a>". If the record has superclasses,
388they are specified as a comma seperated list that starts with a colon character
389(":"). If <a href="#valuedef">value definitions</a> or <a href="#recordlet">let
390expressions</a> are needed for the class they are enclosed in curly braces
391("{}"), otherwise the record ends with a semicolon. Here is a simple TableGen
392file:
393</p>
394
395<p><pre>
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]396<b>class</b> C { <b>bit</b> V = 1; }
397<b>def</b> X : C;
398<b>def</b> Y : C {
399 <b>string</b> Greeting = "hello";
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]400}
401</pre></p>
402
403<p>
404This example defines two definitions, <tt>X</tt> and <tt>Y</tt>, both of which
405derive from the <tt>C</tt> class. Because of this, they both get the <tt>V</tt>
406bit value. The <tt>Y</tt> definition also gets the Greeting member as well.
407</p>
408
409</div>
410
411<!----------------------------------------------------------------------------->
412<div class="doc_subsubsection">
413 <a name="valuedef">Value definitions</tt></a>
414</div>
415
416<div class="doc_text">
417<p>
418Value definitions define named entries in records. A value must be defined
419before it can be referred to as the operand for another value definition, or
420before the value is reset with a <a href="#recordlet">let expression</a>. A
421value is defined by specifying a <a href="#types">TableGen type</a> and a name.
422If an initial value is available, it may be specified after the type with an
423equal sign. Value definitions require terminating semicolons.
424</div>
425
426<!----------------------------------------------------------------------------->
427<div class="doc_subsubsection">
428 <a name="recordlet">'let' expressions</tt></a>
429</div>
430
431<div class="doc_text">
432<p>
433A record-level let expression is used to change the value of a value definition
434in a record. This is primarily useful when a superclass defines a value that a
435derived class or definitions wants to override. Let expressions consist of the
436'<tt>let</tt>' keyword, followed by a value name, an equal sign ("="), and a new
437value for example, a new class could be added to the example above, redefining
438the <tt>V</tt> field for all of its subclasses:</p>
439
440<p><pre>
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]441<b>class</b> D : C { let V = 0; }
442<b>def</b> Z : D;
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]443</pre></p>
444
445<p>
446In this case, the <tt>Z</tt> definition will have a zero value for its "V"
447value, despite the fact that it derives (indirectly) from the <tt>C</tt> class,
448because the <tt>D</tt> class overrode its value.
449</p>
450
451</div>
452
453<!----------------------------------------------------------------------------->
454<div class="doc_subsubsection">
455 <a name="templateargs">Class template arguments</tt></a>
456</div>
457
458<div class="doc_text">
459and default values...
460</div>
461
462
463
464<!-- ======================================================================= -->
465<div class="doc_subsection">
466 <a name="filescope">File scope entities</tt></a>
467</div>
468
469<!----------------------------------------------------------------------------->
470<div class="doc_subsubsection">
471 <a name="include">File inclusion</tt></a>
472</div>
473
474<div class="doc_text">
475<p>
476TableGen supports the '<tt>include</tt>' token, which textually substitutes the
477specified file in place of the include directive. The filename should be
478specified as a double quoted string immediately after the '<tt>include</tt>'
479keyword. Example:
480
481<p><pre>
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]482 <b>include</b> "foo.td"
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]483</pre></p>
484
485</div>
486
487<!----------------------------------------------------------------------------->
488<div class="doc_subsubsection">
489 <a name="globallet">'let' expressions</tt></a>
490</div>
491
492<div class="doc_text">
493<p>
494"let" expressions at file scope are similar to <a href="#recordlet">"let"
495expressions within a record</a>, except they can specify a value binding for
496multiple records at a time, and may be useful in certain other cases.
497File-scope let expressions are really just another way that TableGen allows the
498end-user to factor out commonality from the records.
499</p>
500
501<p>
502File-scope "let" expressions take a comma-seperated list of bindings to apply,
503and one of more records to bind the values in. Here are some examples:
504</p>
505
506<p><pre>
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]507<b>let</b> isTerminator = 1, isReturn = 1 <b>in</b>
508 <b>def</b> RET : X86Inst&lt;"ret", 0xC3, RawFrm, NoArg&gt;;
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]509
Chris Lattnerfa6f3092004-02-06 06:04:25 +0000[diff] [blame^]510<b>let</b> isCall = 1 <b>in</b>
511 <i>// All calls clobber the non-callee saved registers...</i>
512 <b>let</b> Defs = [EAX, ECX, EDX, FP0, FP1, FP2, FP3, FP4, FP5, FP6] in {
513 <b>def</b> CALLpcrel32 : X86Inst&lt;"call", 0xE8, RawFrm, NoArg&gt;;
514 <b>def</b> CALLr32 : X86Inst&lt;"call", 0xFF, MRMS2r, Arg32&gt;;
515 <b>def</b> CALLm32 : X86Inst&lt;"call", 0xFF, MRMS2m, Arg32&gt;;
Chris Lattnerb54c99c2004-02-06 05:42:53 +0000[diff] [blame]516 }
517</pre></p>
518
519<p>
520File-scope "let" expressions are often useful when a couple of definitions need
521to be added to several records, and the records do not otherwise need to be
522opened, as in the case with the CALL* instructions above.
523</p>
524</div>
525
526
527<!-- *********************************************************************** -->
528<div class="doc_section"><a name="backends">TableGen backends</a></div>
529<!-- *********************************************************************** -->
530
531<div class="doc_text">
532
533<p>
534How they work, how to write one. This section should not contain details about
535any particular backend, except maybe -print-enums as an example. This should
536highlight the APIs in TableGen/Record.h.
537</p>
538
539</div>
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542<!-- *********************************************************************** -->
543<div class="doc_section"><a name="codegenerator">The LLVM code generator</a></div>
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545
546<div class="doc_text">
547
548<p>
549This is just a temporary, convenient, place to put stuff about the code
550generator before it gets its own document. This should describe all of the
551tablegen backends used by the code generator and the classes/definitions they
552expect.
553</p>
554
555</div>
556
557
558
559<!-- *********************************************************************** -->
560<hr>
561<div class="doc_footer">
562 <address><a href="mailto:sabre@nondot.org">Chris Lattner</a></address>
563 <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a>
564 <br>
565 Last modified: $Date$
566</div>
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