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 #ifndef U_HIDE_DEPRECATED_API 70 /** 71 * One more than the highest normal collation trace location. 72 * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420. 73 */ 74 UTRACE_FUNCTION_LIMIT, 75 #endif // U_HIDE_DEPRECATED_API 76 77 UTRACE_CONVERSION_START=0x1000, 78 UTRACE_UCNV_OPEN=UTRACE_CONVERSION_START, 79 UTRACE_UCNV_OPEN_PACKAGE, 80 UTRACE_UCNV_OPEN_ALGORITHMIC, 81 UTRACE_UCNV_CLONE, 82 UTRACE_UCNV_CLOSE, 83 UTRACE_UCNV_FLUSH_CACHE, 84 UTRACE_UCNV_LOAD, 85 UTRACE_UCNV_UNLOAD, 86 #ifndef U_HIDE_DEPRECATED_API 87 /** 88 * One more than the highest normal collation trace location. 89 * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420. 90 */ 91 UTRACE_CONVERSION_LIMIT, 92 #endif // U_HIDE_DEPRECATED_API 93 94 UTRACE_COLLATION_START=0x2000, 95 UTRACE_UCOL_OPEN=UTRACE_COLLATION_START, 96 UTRACE_UCOL_CLOSE, 97 UTRACE_UCOL_STRCOLL, 98 UTRACE_UCOL_GET_SORTKEY, 99 UTRACE_UCOL_GETLOCALE, 100 UTRACE_UCOL_NEXTSORTKEYPART, 101 UTRACE_UCOL_STRCOLLITER, 102 UTRACE_UCOL_OPEN_FROM_SHORT_STRING, 103 UTRACE_UCOL_STRCOLLUTF8, /**< @stable ICU 50 */ 104 #ifndef U_HIDE_DEPRECATED_API 105 /** 106 * One more than the highest normal collation trace location. 107 * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420. 108 */ 109 UTRACE_COLLATION_LIMIT 110 #endif // U_HIDE_DEPRECATED_API 111 } UTraceFunctionNumber; 112 113 /** 114 * Setter for the trace level. 115 * @param traceLevel A UTraceLevel value. 116 * @stable ICU 2.8 117 */ 118 U_STABLE void U_EXPORT2 119 utrace_setLevel(int32_t traceLevel); 120 121 /** 122 * Getter for the trace level. 123 * @return The UTraceLevel value being used by ICU. 124 * @stable ICU 2.8 125 */ 126 U_STABLE int32_t U_EXPORT2 127 utrace_getLevel(void); 128 129 /* Trace function pointers types ----------------------------- */ 130 131 /** 132 * Type signature for the trace function to be called when entering a function. 133 * @param context value supplied at the time the trace functions are set. 134 * @param fnNumber Enum value indicating the ICU function being entered. 135 * @stable ICU 2.8 136 */ 137 typedef void U_CALLCONV 138 UTraceEntry(const void *context, int32_t fnNumber); 139 140 /** 141 * Type signature for the trace function to be called when exiting from a function. 142 * @param context value supplied at the time the trace functions are set. 143 * @param fnNumber Enum value indicating the ICU function being exited. 144 * @param fmt A formatting string that describes the number and types 145 * of arguments included with the variable args. The fmt 146 * string has the same form as the utrace_vformat format 147 * string. 148 * @param args A variable arguments list. Contents are described by 149 * the fmt parameter. 150 * @see utrace_vformat 151 * @stable ICU 2.8 152 */ 153 typedef void U_CALLCONV 154 UTraceExit(const void *context, int32_t fnNumber, 155 const char *fmt, va_list args); 156 157 /** 158 * Type signature for the trace function to be called from within an ICU function 159 * to display data or messages. 160 * @param context value supplied at the time the trace functions are set. 161 * @param fnNumber Enum value indicating the ICU function being exited. 162 * @param level The current tracing level 163 * @param fmt A format string describing the tracing data that is supplied 164 * as variable args 165 * @param args The data being traced, passed as variable args. 166 * @stable ICU 2.8 167 */ 168 typedef void U_CALLCONV 169 UTraceData(const void *context, int32_t fnNumber, int32_t level, 170 const char *fmt, va_list args); 171 172 /** 173 * Set ICU Tracing functions. Installs application-provided tracing 174 * functions into ICU. After doing this, subsequent ICU operations 175 * will call back to the installed functions, providing a trace 176 * of the use of ICU. Passing a NULL pointer for a tracing function 177 * is allowed, and inhibits tracing action at points where that function 178 * would be called. 179 * <p> 180 * Tracing and Threads: Tracing functions are global to a process, and 181 * will be called in response to ICU operations performed by any 182 * thread. If tracing of an individual thread is desired, the 183 * tracing functions must themselves filter by checking that the 184 * current thread is the desired thread. 185 * 186 * @param context an uninterpretted pointer. Whatever is passed in 187 * here will in turn be passed to each of the tracing 188 * functions UTraceEntry, UTraceExit and UTraceData. 189 * ICU does not use or alter this pointer. 190 * @param e Callback function to be called on entry to a 191 * a traced ICU function. 192 * @param x Callback function to be called on exit from a 193 * traced ICU function. 194 * @param d Callback function to be called from within a 195 * traced ICU function, for the purpose of providing 196 * data to the trace. 197 * 198 * @stable ICU 2.8 199 */ 200 U_STABLE void U_EXPORT2 201 utrace_setFunctions(const void *context, 202 UTraceEntry *e, UTraceExit *x, UTraceData *d); 203 204 /** 205 * Get the currently installed ICU tracing functions. Note that a null function 206 * pointer will be returned if no trace function has been set. 207 * 208 * @param context The currently installed tracing context. 209 * @param e The currently installed UTraceEntry function. 210 * @param x The currently installed UTraceExit function. 211 * @param d The currently installed UTraceData function. 212 * @stable ICU 2.8 213 */ 214 U_STABLE void U_EXPORT2 215 utrace_getFunctions(const void **context, 216 UTraceEntry **e, UTraceExit **x, UTraceData **d); 217 218 219 220 /* 221 * 222 * ICU trace format string syntax 223 * 224 * Format Strings are passed to UTraceData functions, and define the 225 * number and types of the trace data being passed on each call. 226 * 227 * The UTraceData function, which is supplied by the application, 228 * not by ICU, can either forward the trace data (passed via 229 * varargs) and the format string back to ICU for formatting into 230 * a displayable string, or it can interpret the format itself, 231 * and do as it wishes with the trace data. 232 * 233 * 234 * Goals for the format string 235 * - basic data output 236 * - easy to use for trace programmer 237 * - sufficient provision for data types for trace output readability 238 * - well-defined types and binary portable APIs 239 * 240 * Non-goals 241 * - printf compatibility 242 * - fancy formatting 243 * - argument reordering and other internationalization features 244 * 245 * ICU trace format strings contain plain text with argument inserts, 246 * much like standard printf format strings. 247 * Each insert begins with a '%', then optionally contains a 'v', 248 * then exactly one type character. 249 * Two '%' in a row represent a '%' instead of an insert. 250 * The trace format strings need not have \n at the end. 251 * 252 * 253 * Types 254 * ----- 255 * 256 * Type characters: 257 * - c A char character in the default codepage. 258 * - s A NUL-terminated char * string in the default codepage. 259 * - S A UChar * string. Requires two params, (ptr, length). Length=-1 for nul term. 260 * - b A byte (8-bit integer). 261 * - h A 16-bit integer. Also a 16 bit Unicode code unit. 262 * - d A 32-bit integer. Also a 20 bit Unicode code point value. 263 * - l A 64-bit integer. 264 * - p A data pointer. 265 * 266 * Vectors 267 * ------- 268 * 269 * If the 'v' is not specified, then one item of the specified type 270 * is passed in. 271 * If the 'v' (for "vector") is specified, then a vector of items of the 272 * specified type is passed in, via a pointer to the first item 273 * and an int32_t value for the length of the vector. 274 * Length==-1 means zero or NUL termination. Works for vectors of all types. 275 * 276 * Note: %vS is a vector of (UChar *) strings. The strings must 277 * be nul terminated as there is no way to provide a 278 * separate length parameter for each string. The length 279 * parameter (required for all vectors) is the number of 280 * strings, not the length of the strings. 281 * 282 * Examples 283 * -------- 284 * 285 * These examples show the parameters that will be passed to an application's 286 * UTraceData() function for various formats. 287 * 288 * - the precise formatting is up to the application! 289 * - the examples use type casts for arguments only to _show_ the types of 290 * arguments without needing variable declarations in the examples; 291 * the type casts will not be necessary in actual code 292 * 293 * UTraceDataFunc(context, fnNumber, level, 294 * "There is a character %c in the string %s.", // Format String 295 * (char)c, (const char *)s); // varargs parameters 296 * -> There is a character 0x42 'B' in the string "Bravo". 297 * 298 * UTraceDataFunc(context, fnNumber, level, 299 * "Vector of bytes %vb vector of chars %vc", 300 * (const uint8_t *)bytes, (int32_t)bytesLength, 301 * (const char *)chars, (int32_t)charsLength); 302 * -> Vector of bytes 303 * 42 63 64 3f [4] 304 * vector of chars 305 * "Bcd?"[4] 306 * 307 * UTraceDataFunc(context, fnNumber, level, 308 * "An int32_t %d and a whole bunch of them %vd", 309 * (int32_t)-5, (const int32_t *)ints, (int32_t)intsLength); 310 * -> An int32_t 0xfffffffb and a whole bunch of them 311 * fffffffb 00000005 0000010a [3] 312 * 313 */ 314 315 316 317 /** 318 * Trace output Formatter. An application's UTraceData tracing functions may call 319 * back to this function to format the trace output in a 320 * human readable form. Note that a UTraceData function may choose 321 * to not format the data; it could, for example, save it in 322 * in the raw form it was received (more compact), leaving 323 * formatting for a later trace analyis tool. 324 * @param outBuf pointer to a buffer to receive the formatted output. Output 325 * will be nul terminated if there is space in the buffer - 326 * if the length of the requested output < the output buffer size. 327 * @param capacity Length of the output buffer. 328 * @param indent Number of spaces to indent the output. Intended to allow 329 * data displayed from nested functions to be indented for readability. 330 * @param fmt Format specification for the data to output 331 * @param args Data to be formatted. 332 * @return Length of formatted output, including the terminating NUL. 333 * If buffer capacity is insufficient, the required capacity is returned. 334 * @stable ICU 2.8 335 */ 336 U_STABLE int32_t U_EXPORT2 337 utrace_vformat(char *outBuf, int32_t capacity, 338 int32_t indent, const char *fmt, va_list args); 339 340 /** 341 * Trace output Formatter. An application's UTraceData tracing functions may call 342 * this function to format any additional trace data, beyond that 343 * provided by default, in human readable form with the same 344 * formatting conventions used by utrace_vformat(). 345 * @param outBuf pointer to a buffer to receive the formatted output. Output 346 * will be nul terminated if there is space in the buffer - 347 * if the length of the requested output < the output buffer size. 348 * @param capacity Length of the output buffer. 349 * @param indent Number of spaces to indent the output. Intended to allow 350 * data displayed from nested functions to be indented for readability. 351 * @param fmt Format specification for the data to output 352 * @param ... Data to be formatted. 353 * @return Length of formatted output, including the terminating NUL. 354 * If buffer capacity is insufficient, the required capacity is returned. 355 * @stable ICU 2.8 356 */ 357 U_STABLE int32_t U_EXPORT2 358 utrace_format(char *outBuf, int32_t capacity, 359 int32_t indent, const char *fmt, ...); 360 361 362 363 /* Trace function numbers --------------------------------------------------- */ 364 365 /** 366 * Get the name of a function from its trace function number. 367 * 368 * @param fnNumber The trace number for an ICU function. 369 * @return The name string for the function. 370 * 371 * @see UTraceFunctionNumber 372 * @stable ICU 2.8 373 */ 374 U_STABLE const char * U_EXPORT2 375 utrace_functionName(int32_t fnNumber); 376 377 U_CDECL_END 378 379 #endif 380