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1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 *******************************************************************************
5 *
6 * Copyright (C) 2003-2013, International Business Machines
7 * Corporation and others. All Rights Reserved.
8 *
9 *******************************************************************************
10 * file name: utrace.h
11 * encoding: UTF-8
12 * tab size: 8 (not used)
13 * indentation:4
14 *
15 * created on: 2003aug06
16 * created by: Markus W. Scherer
17 *
18 * Definitions for ICU tracing/logging.
19 *
20 */
21
22 #ifndef __UTRACE_H__
23 #define __UTRACE_H__
24
25 #include <stdarg.h>
26 #include "unicode/utypes.h"
27
28 /**
29 * \file
30 * \brief C API: Definitions for ICU tracing/logging.
31 *
32 * This provides API for debugging the internals of ICU without the use of
33 * a traditional debugger.
34 *
35 * By default, tracing is disabled in ICU. If you need to debug ICU with
36 * tracing, please compile ICU with the --enable-tracing configure option.
37 */
38
39 U_CDECL_BEGIN
40
41 /**
42 * Trace severity levels. Higher levels increase the verbosity of the trace output.
43 * @see utrace_setLevel
44 * @stable ICU 2.8
45 */
46 typedef enum UTraceLevel {
47 /** Disable all tracing @stable ICU 2.8*/
48 UTRACE_OFF=-1,
49 /** Trace error conditions only @stable ICU 2.8*/
50 UTRACE_ERROR=0,
51 /** Trace errors and warnings @stable ICU 2.8*/
52 UTRACE_WARNING=3,
53 /** Trace opens and closes of ICU services @stable ICU 2.8*/
54 UTRACE_OPEN_CLOSE=5,
55 /** Trace an intermediate number of ICU operations @stable ICU 2.8*/
56 UTRACE_INFO=7,
57 /** Trace the maximum number of ICU operations @stable ICU 2.8*/
58 UTRACE_VERBOSE=9
59 } UTraceLevel;
60
61 /**
62 * These are the ICU functions that will be traced when tracing is enabled.
63 * @stable ICU 2.8
64 */
65 typedef enum UTraceFunctionNumber {
66 UTRACE_FUNCTION_START=0,
67 UTRACE_U_INIT=UTRACE_FUNCTION_START,
68 UTRACE_U_CLEANUP,
69
70 #ifndef U_HIDE_DEPRECATED_API
71 /**
72 * One more than the highest normal collation trace location.
73 * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
74 */
75 UTRACE_FUNCTION_LIMIT,
76 #endif // U_HIDE_DEPRECATED_API
77
78 UTRACE_CONVERSION_START=0x1000,
79 UTRACE_UCNV_OPEN=UTRACE_CONVERSION_START,
80 UTRACE_UCNV_OPEN_PACKAGE,
81 UTRACE_UCNV_OPEN_ALGORITHMIC,
82 UTRACE_UCNV_CLONE,
83 UTRACE_UCNV_CLOSE,
84 UTRACE_UCNV_FLUSH_CACHE,
85 UTRACE_UCNV_LOAD,
86 UTRACE_UCNV_UNLOAD,
87
88 #ifndef U_HIDE_DEPRECATED_API
89 /**
90 * One more than the highest normal collation trace location.
91 * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
92 */
93 UTRACE_CONVERSION_LIMIT,
94 #endif // U_HIDE_DEPRECATED_API
95
96 UTRACE_COLLATION_START=0x2000,
97 UTRACE_UCOL_OPEN=UTRACE_COLLATION_START,
98 UTRACE_UCOL_CLOSE,
99 UTRACE_UCOL_STRCOLL,
100 UTRACE_UCOL_GET_SORTKEY,
101 UTRACE_UCOL_GETLOCALE,
102 UTRACE_UCOL_NEXTSORTKEYPART,
103 UTRACE_UCOL_STRCOLLITER,
104 UTRACE_UCOL_OPEN_FROM_SHORT_STRING,
105 UTRACE_UCOL_STRCOLLUTF8, /**< @stable ICU 50 */
106
107 #ifndef U_HIDE_DEPRECATED_API
108 /**
109 * One more than the highest normal collation trace location.
110 * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
111 */
112 UTRACE_COLLATION_LIMIT,
113 #endif // U_HIDE_DEPRECATED_API
114
115 #ifndef U_HIDE_DRAFT_API
116
117 /**
118 * The lowest resource/data location.
119 * @draft ICU 65
120 */
121 UTRACE_UDATA_START=0x3000,
122
123 /**
124 * Indicates that a value was read from a resource bundle. Provides three
125 * C-style strings to UTraceData: type, file name, and resource path. The
126 * possible types are:
127 *
128 * - "string" (a string value was accessed)
129 * - "binary" (a binary value was accessed)
130 * - "intvector" (a integer vector value was accessed)
131 * - "int" (a signed integer value was accessed)
132 * - "uint" (a unsigned integer value was accessed)
133 * - "get" (a path was loaded, but the value was not accessed)
134 * - "getalias" (a path was loaded, and an alias was resolved)
135 *
136 * @draft ICU 65
137 */
138 UTRACE_UDATA_RESOURCE=UTRACE_UDATA_START,
139
140 /**
141 * Indicates that a resource bundle was opened.
142 *
143 * Provides one C-style string to UTraceData: file name.
144 * @draft ICU 65
145 */
146 UTRACE_UDATA_BUNDLE,
147
148 /**
149 * Indicates that a data file was opened, but not *.res files.
150 *
151 * Provides one C-style string to UTraceData: file name.
152 *
153 * @draft ICU 65
154 */
155 UTRACE_UDATA_DATA_FILE,
156
157 /**
158 * Indicates that a *.res file was opened.
159 *
160 * This differs from UTRACE_UDATA_BUNDLE because a res file is typically
161 * opened only once per application runtime, but the bundle corresponding
162 * to that res file may be opened many times.
163 *
164 * Provides one C-style string to UTraceData: file name.
165 *
166 * @draft ICU 65
167 */
168 UTRACE_UDATA_RES_FILE,
169
170 #endif // U_HIDE_DRAFT_API
171
172 #ifndef U_HIDE_INTERNAL_API
173 /**
174 * One more than the highest normal resource/data trace location.
175 * @internal The numeric value may change over time, see ICU ticket #12420.
176 */
177 UTRACE_RES_DATA_LIMIT,
178 #endif // U_HIDE_INTERNAL_API
179
180 #ifndef U_HIDE_DRAFT_API
181 /**
182 * The lowest break iterator location.
183 * @draft ICU 67
184 */
185 UTRACE_UBRK_START=0x4000,
186
187 /**
188 * Indicates that a character instance of break iterator was created.
189 *
190 * @draft ICU 67
191 */
192 UTRACE_UBRK_CREATE_CHARACTER = UTRACE_UBRK_START,
193
194 /**
195 * Indicates that a word instance of break iterator was created.
196 *
197 * @draft ICU 67
198 */
199 UTRACE_UBRK_CREATE_WORD,
200
201 /**
202 * Indicates that a line instance of break iterator was created.
203 *
204 * Provides one C-style string to UTraceData: the lb value ("",
205 * "loose", "strict", or "normal").
206 *
207 * @draft ICU 67
208 */
209 UTRACE_UBRK_CREATE_LINE,
210
211 /**
212 * Indicates that a sentence instance of break iterator was created.
213 *
214 * @draft ICU 67
215 */
216 UTRACE_UBRK_CREATE_SENTENCE,
217
218 /**
219 * Indicates that a title instance of break iterator was created.
220 *
221 * @draft ICU 67
222 */
223 UTRACE_UBRK_CREATE_TITLE,
224
225 /**
226 * Indicates that an internal dictionary break engine was created.
227 *
228 * Provides one C-style string to UTraceData: the script code of what
229 * the break engine cover ("Hani", "Khmr", "Laoo", "Mymr", or "Thai").
230 *
231 * @draft ICU 67
232 */
233 UTRACE_UBRK_CREATE_BREAK_ENGINE,
234
235 #endif // U_HIDE_DRAFT_API
236
237 #ifndef U_HIDE_INTERNAL_API
238 /**
239 * One more than the highest normal break iterator trace location.
240 * @internal The numeric value may change over time, see ICU ticket #12420.
241 */
242 UTRACE_UBRK_LIMIT,
243 #endif // U_HIDE_INTERNAL_API
244
245 } UTraceFunctionNumber;
246
247 /**
248 * Setter for the trace level.
249 * @param traceLevel A UTraceLevel value.
250 * @stable ICU 2.8
251 */
252 U_STABLE void U_EXPORT2
253 utrace_setLevel(int32_t traceLevel);
254
255 /**
256 * Getter for the trace level.
257 * @return The UTraceLevel value being used by ICU.
258 * @stable ICU 2.8
259 */
260 U_STABLE int32_t U_EXPORT2
261 utrace_getLevel(void);
262
263 /* Trace function pointers types ----------------------------- */
264
265 /**
266 * Type signature for the trace function to be called when entering a function.
267 * @param context value supplied at the time the trace functions are set.
268 * @param fnNumber Enum value indicating the ICU function being entered.
269 * @stable ICU 2.8
270 */
271 typedef void U_CALLCONV
272 UTraceEntry(const void *context, int32_t fnNumber);
273
274 /**
275 * Type signature for the trace function to be called when exiting from a function.
276 * @param context value supplied at the time the trace functions are set.
277 * @param fnNumber Enum value indicating the ICU function being exited.
278 * @param fmt A formatting string that describes the number and types
279 * of arguments included with the variable args. The fmt
280 * string has the same form as the utrace_vformat format
281 * string.
282 * @param args A variable arguments list. Contents are described by
283 * the fmt parameter.
284 * @see utrace_vformat
285 * @stable ICU 2.8
286 */
287 typedef void U_CALLCONV
288 UTraceExit(const void *context, int32_t fnNumber,
289 const char *fmt, va_list args);
290
291 /**
292 * Type signature for the trace function to be called from within an ICU function
293 * to display data or messages.
294 * @param context value supplied at the time the trace functions are set.
295 * @param fnNumber Enum value indicating the ICU function being exited.
296 * @param level The current tracing level
297 * @param fmt A format string describing the tracing data that is supplied
298 * as variable args
299 * @param args The data being traced, passed as variable args.
300 * @stable ICU 2.8
301 */
302 typedef void U_CALLCONV
303 UTraceData(const void *context, int32_t fnNumber, int32_t level,
304 const char *fmt, va_list args);
305
306 /**
307 * Set ICU Tracing functions. Installs application-provided tracing
308 * functions into ICU. After doing this, subsequent ICU operations
309 * will call back to the installed functions, providing a trace
310 * of the use of ICU. Passing a NULL pointer for a tracing function
311 * is allowed, and inhibits tracing action at points where that function
312 * would be called.
313 * <p>
314 * Tracing and Threads: Tracing functions are global to a process, and
315 * will be called in response to ICU operations performed by any
316 * thread. If tracing of an individual thread is desired, the
317 * tracing functions must themselves filter by checking that the
318 * current thread is the desired thread.
319 *
320 * @param context an uninterpreted pointer. Whatever is passed in
321 * here will in turn be passed to each of the tracing
322 * functions UTraceEntry, UTraceExit and UTraceData.
323 * ICU does not use or alter this pointer.
324 * @param e Callback function to be called on entry to a
325 * a traced ICU function.
326 * @param x Callback function to be called on exit from a
327 * traced ICU function.
328 * @param d Callback function to be called from within a
329 * traced ICU function, for the purpose of providing
330 * data to the trace.
331 *
332 * @stable ICU 2.8
333 */
334 U_STABLE void U_EXPORT2
335 utrace_setFunctions(const void *context,
336 UTraceEntry *e, UTraceExit *x, UTraceData *d);
337
338 /**
339 * Get the currently installed ICU tracing functions. Note that a null function
340 * pointer will be returned if no trace function has been set.
341 *
342 * @param context The currently installed tracing context.
343 * @param e The currently installed UTraceEntry function.
344 * @param x The currently installed UTraceExit function.
345 * @param d The currently installed UTraceData function.
346 * @stable ICU 2.8
347 */
348 U_STABLE void U_EXPORT2
349 utrace_getFunctions(const void **context,
350 UTraceEntry **e, UTraceExit **x, UTraceData **d);
351
352
353
354 /*
355 *
356 * ICU trace format string syntax
357 *
358 * Format Strings are passed to UTraceData functions, and define the
359 * number and types of the trace data being passed on each call.
360 *
361 * The UTraceData function, which is supplied by the application,
362 * not by ICU, can either forward the trace data (passed via
363 * varargs) and the format string back to ICU for formatting into
364 * a displayable string, or it can interpret the format itself,
365 * and do as it wishes with the trace data.
366 *
367 *
368 * Goals for the format string
369 * - basic data output
370 * - easy to use for trace programmer
371 * - sufficient provision for data types for trace output readability
372 * - well-defined types and binary portable APIs
373 *
374 * Non-goals
375 * - printf compatibility
376 * - fancy formatting
377 * - argument reordering and other internationalization features
378 *
379 * ICU trace format strings contain plain text with argument inserts,
380 * much like standard printf format strings.
381 * Each insert begins with a '%', then optionally contains a 'v',
382 * then exactly one type character.
383 * Two '%' in a row represent a '%' instead of an insert.
384 * The trace format strings need not have \n at the end.
385 *
386 *
387 * Types
388 * -----
389 *
390 * Type characters:
391 * - c A char character in the default codepage.
392 * - s A NUL-terminated char * string in the default codepage.
393 * - S A UChar * string. Requires two params, (ptr, length). Length=-1 for nul term.
394 * - b A byte (8-bit integer).
395 * - h A 16-bit integer. Also a 16 bit Unicode code unit.
396 * - d A 32-bit integer. Also a 20 bit Unicode code point value.
397 * - l A 64-bit integer.
398 * - p A data pointer.
399 *
400 * Vectors
401 * -------
402 *
403 * If the 'v' is not specified, then one item of the specified type
404 * is passed in.
405 * If the 'v' (for "vector") is specified, then a vector of items of the
406 * specified type is passed in, via a pointer to the first item
407 * and an int32_t value for the length of the vector.
408 * Length==-1 means zero or NUL termination. Works for vectors of all types.
409 *
410 * Note: %vS is a vector of (UChar *) strings. The strings must
411 * be nul terminated as there is no way to provide a
412 * separate length parameter for each string. The length
413 * parameter (required for all vectors) is the number of
414 * strings, not the length of the strings.
415 *
416 * Examples
417 * --------
418 *
419 * These examples show the parameters that will be passed to an application's
420 * UTraceData() function for various formats.
421 *
422 * - the precise formatting is up to the application!
423 * - the examples use type casts for arguments only to _show_ the types of
424 * arguments without needing variable declarations in the examples;
425 * the type casts will not be necessary in actual code
426 *
427 * UTraceDataFunc(context, fnNumber, level,
428 * "There is a character %c in the string %s.", // Format String
429 * (char)c, (const char *)s); // varargs parameters
430 * -> There is a character 0x42 'B' in the string "Bravo".
431 *
432 * UTraceDataFunc(context, fnNumber, level,
433 * "Vector of bytes %vb vector of chars %vc",
434 * (const uint8_t *)bytes, (int32_t)bytesLength,
435 * (const char *)chars, (int32_t)charsLength);
436 * -> Vector of bytes
437 * 42 63 64 3f [4]
438 * vector of chars
439 * "Bcd?"[4]
440 *
441 * UTraceDataFunc(context, fnNumber, level,
442 * "An int32_t %d and a whole bunch of them %vd",
443 * (int32_t)-5, (const int32_t *)ints, (int32_t)intsLength);
444 * -> An int32_t 0xfffffffb and a whole bunch of them
445 * fffffffb 00000005 0000010a [3]
446 *
447 */
448
449
450
451 /**
452 * Trace output Formatter. An application's UTraceData tracing functions may call
453 * back to this function to format the trace output in a
454 * human readable form. Note that a UTraceData function may choose
455 * to not format the data; it could, for example, save it in
456 * in the raw form it was received (more compact), leaving
457 * formatting for a later trace analysis tool.
458 * @param outBuf pointer to a buffer to receive the formatted output. Output
459 * will be nul terminated if there is space in the buffer -
460 * if the length of the requested output < the output buffer size.
461 * @param capacity Length of the output buffer.
462 * @param indent Number of spaces to indent the output. Intended to allow
463 * data displayed from nested functions to be indented for readability.
464 * @param fmt Format specification for the data to output
465 * @param args Data to be formatted.
466 * @return Length of formatted output, including the terminating NUL.
467 * If buffer capacity is insufficient, the required capacity is returned.
468 * @stable ICU 2.8
469 */
470 U_STABLE int32_t U_EXPORT2
471 utrace_vformat(char *outBuf, int32_t capacity,
472 int32_t indent, const char *fmt, va_list args);
473
474 /**
475 * Trace output Formatter. An application's UTraceData tracing functions may call
476 * this function to format any additional trace data, beyond that
477 * provided by default, in human readable form with the same
478 * formatting conventions used by utrace_vformat().
479 * @param outBuf pointer to a buffer to receive the formatted output. Output
480 * will be nul terminated if there is space in the buffer -
481 * if the length of the requested output < the output buffer size.
482 * @param capacity Length of the output buffer.
483 * @param indent Number of spaces to indent the output. Intended to allow
484 * data displayed from nested functions to be indented for readability.
485 * @param fmt Format specification for the data to output
486 * @param ... Data to be formatted.
487 * @return Length of formatted output, including the terminating NUL.
488 * If buffer capacity is insufficient, the required capacity is returned.
489 * @stable ICU 2.8
490 */
491 U_STABLE int32_t U_EXPORT2
492 utrace_format(char *outBuf, int32_t capacity,
493 int32_t indent, const char *fmt, ...);
494
495
496
497 /* Trace function numbers --------------------------------------------------- */
498
499 /**
500 * Get the name of a function from its trace function number.
501 *
502 * @param fnNumber The trace number for an ICU function.
503 * @return The name string for the function.
504 *
505 * @see UTraceFunctionNumber
506 * @stable ICU 2.8
507 */
508 U_STABLE const char * U_EXPORT2
509 utrace_functionName(int32_t fnNumber);
510
511 U_CDECL_END
512
513 #endif