OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [cdl-guide/] [ref.define-proc.html] - Blame information for rev 593

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 28 unneback
<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
2
<!-- This material may be distributed only subject to the terms      -->
3
<!-- and conditions set forth in the Open Publication License, v1.0  -->
4
<!-- or later (the latest version is presently available at          -->
5
<!-- http://www.opencontent.org/openpub/).                           -->
6
<!-- Distribution of the work or derivative of the work in any       -->
7
<!-- standard (paper) book form is prohibited unless prior           -->
8
<!-- permission is obtained from the copyright holder.               -->
9
<HTML
10
><HEAD
11
><TITLE
12
>define_proc</TITLE
13
><meta name="MSSmartTagsPreventParsing" content="TRUE">
14
<META
15
NAME="GENERATOR"
16
CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
17
"><LINK
18
REL="HOME"
19
TITLE="The eCos Component Writer's Guide"
20
HREF="cdl-guide.html"><LINK
21
REL="UP"
22
TITLE="CDL Language Specification"
23
HREF="reference.html"><LINK
24
REL="PREVIOUS"
25
TITLE="define_header"
26
HREF="ref.define-header.html"><LINK
27
REL="NEXT"
28
TITLE="description"
29
HREF="ref.description.html"></HEAD
30
><BODY
31
CLASS="REFENTRY"
32
BGCOLOR="#FFFFFF"
33
TEXT="#000000"
34
LINK="#0000FF"
35
VLINK="#840084"
36
ALINK="#0000FF"
37
><DIV
38
CLASS="NAVHEADER"
39
><TABLE
40
SUMMARY="Header navigation table"
41
WIDTH="100%"
42
BORDER="0"
43
CELLPADDING="0"
44
CELLSPACING="0"
45
><TR
46
><TH
47
COLSPAN="3"
48
ALIGN="center"
49
>The <SPAN
50
CLASS="APPLICATION"
51
>eCos</SPAN
52
> Component Writer's Guide</TH
53
></TR
54
><TR
55
><TD
56
WIDTH="10%"
57
ALIGN="left"
58
VALIGN="bottom"
59
><A
60
HREF="ref.define-header.html"
61
ACCESSKEY="P"
62
>Prev</A
63
></TD
64
><TD
65
WIDTH="80%"
66
ALIGN="center"
67
VALIGN="bottom"
68
></TD
69
><TD
70
WIDTH="10%"
71
ALIGN="right"
72
VALIGN="bottom"
73
><A
74
HREF="ref.description.html"
75
ACCESSKEY="N"
76
>Next</A
77
></TD
78
></TR
79
></TABLE
80
><HR
81
ALIGN="LEFT"
82
WIDTH="100%"></DIV
83
><H1
84
><A
85
NAME="REF.DEFINE-PROC"><SPAN
86
CLASS="PROPERTY"
87
>define_proc</SPAN
88
></H1
89
><DIV
90
CLASS="REFNAMEDIV"
91
><A
92
NAME="AEN4169"
93
></A
94
><H2
95
>Name</H2
96
>Property <SPAN
97
CLASS="PROPERTY"
98
>define_proc</SPAN
99
>&nbsp;--&nbsp;Use a fragment of Tcl code to output additional data to
100
configuration header files.</DIV
101
><DIV
102
CLASS="REFSYNOPSISDIV"
103
><A
104
NAME="AEN4173"><H2
105
>Synopsis</H2
106
><TABLE
107
BORDER="5"
108
BGCOLOR="#E0E0F0"
109
WIDTH="70%"
110
><TR
111
><TD
112
><PRE
113
CLASS="SYNOPSIS"
114
>cdl_option &lt;name&gt; {
115
    define_proc &lt;Tcl script&gt;
116
    &#8230;
117
}</PRE
118
></TD
119
></TR
120
></TABLE
121
></DIV
122
><DIV
123
CLASS="REFSECT1"
124
><A
125
NAME="AEN4175"
126
></A
127
><H2
128
>Description</H2
129
><P
130
>For most configuration options it is sufficient to have an entry in
131
the configuration header file of the form:</P
132
><TABLE
133
BORDER="5"
134
BGCOLOR="#E0E0F0"
135
WIDTH="70%"
136
><TR
137
><TD
138
><PRE
139
CLASS="PROGRAMLISTING"
140
>#define &lt;name&gt; &lt;value&gt;</PRE
141
></TD
142
></TR
143
></TABLE
144
><P
145
>In some cases it is desirable to perform some more complicated
146
processing when generating a configuration header file. There are a
147
number of CDL properties for this, including <SPAN
148
CLASS="PROPERTY"
149
>define_format</SPAN
150
> and
151
<SPAN
152
CLASS="PROPERTY"
153
>if_define</SPAN
154
>. The most flexible is <SPAN
155
CLASS="PROPERTY"
156
>define_proc</SPAN
157
>: this allows the
158
component writer to specify a Tcl script that gets invoked whenever
159
the configuration system generates the header file for the owning
160
package. The script can output anything to the header file, for
161
example it could generate a C data structure based on various
162
configuration values.</P
163
><P
164
>At the point that the <SPAN
165
CLASS="PROPERTY"
166
>define_proc</SPAN
167
> script is invoked there will be
168
two channels to open files, accessible via Tcl variables:
169
<TT
170
CLASS="LITERAL"
171
>cdl_header</TT
172
> is a channel to the current package's
173
own header file for example
174
<TT
175
CLASS="FILENAME"
176
>pkgconf/kernel.h</TT
177
>;
178
<TT
179
CLASS="LITERAL"
180
>cdl_system_header</TT
181
> is a channel to the global
182
configuration file
183
<TT
184
CLASS="FILENAME"
185
>pkgconf/system.h</TT
186
>. A typical
187
<SPAN
188
CLASS="PROPERTY"
189
>define_proc</SPAN
190
> script will use the <TT
191
CLASS="LITERAL"
192
>puts</TT
193
> command to
194
output data to one of these channels.</P
195
><P
196
><SPAN
197
CLASS="PROPERTY"
198
>define_proc</SPAN
199
> properties only take effect if the current option is
200
active and enabled. The default behavior of the configuration system
201
for an option with the <TT
202
CLASS="LITERAL"
203
>bool</TT
204
> flavor corresponds to
205
the following <SPAN
206
CLASS="PROPERTY"
207
>define_proc</SPAN
208
>:</P
209
><TABLE
210
BORDER="5"
211
BGCOLOR="#E0E0F0"
212
WIDTH="70%"
213
><TR
214
><TD
215
><PRE
216
CLASS="PROGRAMLISTING"
217
>    cdl_option XXX {
218
        &#8230;
219
        define_proc {
220
            puts $cdl_header "#define XXX 1"
221
        }
222
}</PRE
223
></TD
224
></TR
225
></TABLE
226
><DIV
227
CLASS="WARNING"
228
><P
229
></P
230
><TABLE
231
CLASS="WARNING"
232
BORDER="1"
233
WIDTH="100%"
234
><TR
235
><TD
236
ALIGN="CENTER"
237
><B
238
>Warning</B
239
></TD
240
></TR
241
><TR
242
><TD
243
ALIGN="LEFT"
244
><P
245
>In the current implementation it is not possible for a <SPAN
246
CLASS="PROPERTY"
247
>define_proc</SPAN
248
>
249
property to examine the current values of various configuration
250
options and adapt accordingly. This is a major limitation, and will be
251
addressed in future versions of the configuration tools.</P
252
></TD
253
></TR
254
></TABLE
255
></DIV
256
></DIV
257
><DIV
258
CLASS="REFSECT1"
259
><A
260
NAME="AEN4199"
261
></A
262
><H2
263
>Example</H2
264
><TABLE
265
BORDER="5"
266
BGCOLOR="#E0E0F0"
267
WIDTH="70%"
268
><TR
269
><TD
270
><PRE
271
CLASS="PROGRAMLISTING"
272
>cdl_package CYGPKG_HAL_ARM_PID {
273
    display       "ARM PID evaluation board"
274
    parent        CYGPKG_HAL_ARM
275
    define_header hal_arm_pid.h
276
    include_dir   cyg/hal
277
    hardware
278
 
279
    define_proc {
280
        puts $::cdl_system_header "#define CYGBLD_HAL_TARGET_H   &lt;pkgconf/hal_arm.h&gt;"
281
        puts $::cdl_system_header "#define CYGBLD_HAL_PLATFORM_H &lt;pkgconf/hal_arm_pid.h&gt;"
282
        puts $::cdl_header ""
283
        puts $::cdl_header "#define HAL_PLATFORM_CPU    \"ARM 7TDMI\""
284
        puts $::cdl_header "#define HAL_PLATFORM_BOARD  \"PID\""
285
        puts $::cdl_header "#define HAL_PLATFORM_EXTRA  \"\""
286
        puts $::cdl_header ""
287
    }
288
    &#8230;
289
}</PRE
290
></TD
291
></TR
292
></TABLE
293
></DIV
294
><DIV
295
CLASS="REFSECT1"
296
><A
297
NAME="AEN4202"
298
></A
299
><H2
300
>See Also</H2
301
><P
302
>Properties <A
303
HREF="ref.define.html"
304
><SPAN
305
CLASS="PROPERTY"
306
>define</SPAN
307
></A
308
>,
309
<A
310
HREF="ref.define-format.html"
311
><SPAN
312
CLASS="PROPERTY"
313
>define_format</SPAN
314
></A
315
>,
316
<A
317
HREF="ref.define-header.html"
318
><SPAN
319
CLASS="PROPERTY"
320
>define_header</SPAN
321
></A
322
>,
323
<A
324
HREF="ref.if-define.html"
325
><SPAN
326
CLASS="PROPERTY"
327
>if_define</SPAN
328
></A
329
> and
330
<A
331
HREF="ref.no-define.html"
332
><SPAN
333
CLASS="PROPERTY"
334
>no_define</SPAN
335
></A
336
>.</P
337
></DIV
338
><DIV
339
CLASS="NAVFOOTER"
340
><HR
341
ALIGN="LEFT"
342
WIDTH="100%"><TABLE
343
SUMMARY="Footer navigation table"
344
WIDTH="100%"
345
BORDER="0"
346
CELLPADDING="0"
347
CELLSPACING="0"
348
><TR
349
><TD
350
WIDTH="33%"
351
ALIGN="left"
352
VALIGN="top"
353
><A
354
HREF="ref.define-header.html"
355
ACCESSKEY="P"
356
>Prev</A
357
></TD
358
><TD
359
WIDTH="34%"
360
ALIGN="center"
361
VALIGN="top"
362
><A
363
HREF="cdl-guide.html"
364
ACCESSKEY="H"
365
>Home</A
366
></TD
367
><TD
368
WIDTH="33%"
369
ALIGN="right"
370
VALIGN="top"
371
><A
372
HREF="ref.description.html"
373
ACCESSKEY="N"
374
>Next</A
375
></TD
376
></TR
377
><TR
378
><TD
379
WIDTH="33%"
380
ALIGN="left"
381
VALIGN="top"
382
><SPAN
383
CLASS="PROPERTY"
384
>define_header</SPAN
385
></TD
386
><TD
387
WIDTH="34%"
388
ALIGN="center"
389
VALIGN="top"
390
><A
391
HREF="reference.html"
392
ACCESSKEY="U"
393
>Up</A
394
></TD
395
><TD
396
WIDTH="33%"
397
ALIGN="right"
398
VALIGN="top"
399
><SPAN
400
CLASS="PROPERTY"
401
>description</SPAN
402
></TD
403
></TR
404
></TABLE
405
></DIV
406
></BODY
407
></HTML
408
>

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.