1 /* 2 ******************************************************************************* 3 * 4 * Copyright (C) 2003-2012, International Business Machines 5 * Corporation and others. All Rights Reserved. 6 * 7 ******************************************************************************* 8 * file name: utrace.h 9 * encoding: US-ASCII 10 * tab size: 8 (not used) 11 * indentation:4 12 * 13 * created on: 2003aug06 14 * created by: Markus W. Scherer 15 * 16 * Definitions for ICU tracing/logging. 17 * 18 */ 19 20 #ifndef __UTRACE_H__ 21 #define __UTRACE_H__ 22 23 #include <stdarg.h> 24 #include "unicode/utypes.h" 25 26 /** 27 * \file 28 * \brief C API: Definitions for ICU tracing/logging. 29 * 30 * This provides API for debugging the internals of ICU without the use of 31 * a traditional debugger. 32 * 33 * By default, tracing is disabled in ICU. If you need to debug ICU with 34 * tracing, please compile ICU with the --enable-tracing configure option. 35 */ 36 37 U_CDECL_BEGIN 38 39 /** 40 * Trace severity levels. Higher levels increase the verbosity of the trace output. 41 * @see utrace_setLevel 42 * @stable ICU 2.8 43 */ 44 typedef enum UTraceLevel { 45 /** Disable all tracing @stable ICU 2.8*/ 46 UTRACE_OFF=-1, 47 /** Trace error conditions only @stable ICU 2.8*/ 48 UTRACE_ERROR=0, 49 /** Trace errors and warnings @stable ICU 2.8*/ 50 UTRACE_WARNING=3, 51 /** Trace opens and closes of ICU services @stable ICU 2.8*/ 52 UTRACE_OPEN_CLOSE=5, 53 /** Trace an intermediate number of ICU operations @stable ICU 2.8*/ 54 UTRACE_INFO=7, 55 /** Trace the maximum number of ICU operations @stable ICU 2.8*/ 56 UTRACE_VERBOSE=9 57 } UTraceLevel; 58 59 /** 60 * These are the ICU functions that will be traced when tracing is enabled. 61 * @stable ICU 2.8 62 */ 63 typedef enum UTraceFunctionNumber { 64 UTRACE_FUNCTION_START=0, 65 UTRACE_U_INIT=UTRACE_FUNCTION_START, 66 UTRACE_U_CLEANUP, 67 UTRACE_FUNCTION_LIMIT, 68 69 UTRACE_CONVERSION_START=0x1000, 70 UTRACE_UCNV_OPEN=UTRACE_CONVERSION_START, 71 UTRACE_UCNV_OPEN_PACKAGE, 72 UTRACE_UCNV_OPEN_ALGORITHMIC, 73 UTRACE_UCNV_CLONE, 74 UTRACE_UCNV_CLOSE, 75 UTRACE_UCNV_FLUSH_CACHE, 76 UTRACE_UCNV_LOAD, 77 UTRACE_UCNV_UNLOAD, 78 UTRACE_CONVERSION_LIMIT, 79 80 UTRACE_COLLATION_START=0x2000, 81 UTRACE_UCOL_OPEN=UTRACE_COLLATION_START, 82 UTRACE_UCOL_CLOSE, 83 UTRACE_UCOL_STRCOLL, 84 UTRACE_UCOL_GET_SORTKEY, 85 UTRACE_UCOL_GETLOCALE, 86 UTRACE_UCOL_NEXTSORTKEYPART, 87 UTRACE_UCOL_STRCOLLITER, 88 UTRACE_UCOL_OPEN_FROM_SHORT_STRING, 89 UTRACE_UCOL_STRCOLLUTF8, /**< @draft ICU 50 */ 90 UTRACE_COLLATION_LIMIT 91 } UTraceFunctionNumber; 92 93 /** 94 * Setter for the trace level. 95 * @param traceLevel A UTraceLevel value. 96 * @stable ICU 2.8 97 */ 98 U_STABLE void U_EXPORT2 99 utrace_setLevel(int32_t traceLevel); 100 101 /** 102 * Getter for the trace level. 103 * @return The UTraceLevel value being used by ICU. 104 * @stable ICU 2.8 105 */ 106 U_STABLE int32_t U_EXPORT2 107 utrace_getLevel(void); 108 109 /* Trace function pointers types ----------------------------- */ 110 111 /** 112 * Type signature for the trace function to be called when entering a function. 113 * @param context value supplied at the time the trace functions are set. 114 * @param fnNumber Enum value indicating the ICU function being entered. 115 * @stable ICU 2.8 116 */ 117 typedef void U_CALLCONV 118 UTraceEntry(const void *context, int32_t fnNumber); 119 120 /** 121 * Type signature for the trace function to be called when exiting from a function. 122 * @param context value supplied at the time the trace functions are set. 123 * @param fnNumber Enum value indicating the ICU function being exited. 124 * @param fmt A formatting string that describes the number and types 125 * of arguments included with the variable args. The fmt 126 * string has the same form as the utrace_vformat format 127 * string. 128 * @param args A variable arguments list. Contents are described by 129 * the fmt parameter. 130 * @see utrace_vformat 131 * @stable ICU 2.8 132 */ 133 typedef void U_CALLCONV 134 UTraceExit(const void *context, int32_t fnNumber, 135 const char *fmt, va_list args); 136 137 /** 138 * Type signature for the trace function to be called from within an ICU function 139 * to display data or messages. 140 * @param context value supplied at the time the trace functions are set. 141 * @param fnNumber Enum value indicating the ICU function being exited. 142 * @param level The current tracing level 143 * @param fmt A format string describing the tracing data that is supplied 144 * as variable args 145 * @param args The data being traced, passed as variable args. 146 * @stable ICU 2.8 147 */ 148 typedef void U_CALLCONV 149 UTraceData(const void *context, int32_t fnNumber, int32_t level, 150 const char *fmt, va_list args); 151 152 /** 153 * Set ICU Tracing functions. Installs application-provided tracing 154 * functions into ICU. After doing this, subsequent ICU operations 155 * will call back to the installed functions, providing a trace 156 * of the use of ICU. Passing a NULL pointer for a tracing function 157 * is allowed, and inhibits tracing action at points where that function 158 * would be called. 159 * <p> 160 * Tracing and Threads: Tracing functions are global to a process, and 161 * will be called in response to ICU operations performed by any 162 * thread. If tracing of an individual thread is desired, the 163 * tracing functions must themselves filter by checking that the 164 * current thread is the desired thread. 165 * 166 * @param context an uninterpretted pointer. Whatever is passed in 167 * here will in turn be passed to each of the tracing 168 * functions UTraceEntry, UTraceExit and UTraceData. 169 * ICU does not use or alter this pointer. 170 * @param e Callback function to be called on entry to a 171 * a traced ICU function. 172 * @param x Callback function to be called on exit from a 173 * traced ICU function. 174 * @param d Callback function to be called from within a 175 * traced ICU function, for the purpose of providing 176 * data to the trace. 177 * 178 * @stable ICU 2.8 179 */ 180 U_STABLE void U_EXPORT2 181 utrace_setFunctions(const void *context, 182 UTraceEntry *e, UTraceExit *x, UTraceData *d); 183 184 /** 185 * Get the currently installed ICU tracing functions. Note that a null function 186 * pointer will be returned if no trace function has been set. 187 * 188 * @param context The currently installed tracing context. 189 * @param e The currently installed UTraceEntry function. 190 * @param x The currently installed UTraceExit function. 191 * @param d The currently installed UTraceData function. 192 * @stable ICU 2.8 193 */ 194 U_STABLE void U_EXPORT2 195 utrace_getFunctions(const void **context, 196 UTraceEntry **e, UTraceExit **x, UTraceData **d); 197 198 199 200 /* 201 * 202 * ICU trace format string syntax 203 * 204 * Format Strings are passed to UTraceData functions, and define the 205 * number and types of the trace data being passed on each call. 206 * 207 * The UTraceData function, which is supplied by the application, 208 * not by ICU, can either forward the trace data (passed via 209 * varargs) and the format string back to ICU for formatting into 210 * a displayable string, or it can interpret the format itself, 211 * and do as it wishes with the trace data. 212 * 213 * 214 * Goals for the format string 215 * - basic data output 216 * - easy to use for trace programmer 217 * - sufficient provision for data types for trace output readability 218 * - well-defined types and binary portable APIs 219 * 220 * Non-goals 221 * - printf compatibility 222 * - fancy formatting 223 * - argument reordering and other internationalization features 224 * 225 * ICU trace format strings contain plain text with argument inserts, 226 * much like standard printf format strings. 227 * Each insert begins with a '%', then optionally contains a 'v', 228 * then exactly one type character. 229 * Two '%' in a row represent a '%' instead of an insert. 230 * The trace format strings need not have \n at the end. 231 * 232 * 233 * Types 234 * ----- 235 * 236 * Type characters: 237 * - c A char character in the default codepage. 238 * - s A NUL-terminated char * string in the default codepage. 239 * - S A UChar * string. Requires two params, (ptr, length). Length=-1 for nul term. 240 * - b A byte (8-bit integer). 241 * - h A 16-bit integer. Also a 16 bit Unicode code unit. 242 * - d A 32-bit integer. Also a 20 bit Unicode code point value. 243 * - l A 64-bit integer. 244 * - p A data pointer. 245 * 246 * Vectors 247 * ------- 248 * 249 * If the 'v' is not specified, then one item of the specified type 250 * is passed in. 251 * If the 'v' (for "vector") is specified, then a vector of items of the 252 * specified type is passed in, via a pointer to the first item 253 * and an int32_t value for the length of the vector. 254 * Length==-1 means zero or NUL termination. Works for vectors of all types. 255 * 256 * Note: %vS is a vector of (UChar *) strings. The strings must 257 * be nul terminated as there is no way to provide a 258 * separate length parameter for each string. The length 259 * parameter (required for all vectors) is the number of 260 * strings, not the length of the strings. 261 * 262 * Examples 263 * -------- 264 * 265 * These examples show the parameters that will be passed to an application's 266 * UTraceData() function for various formats. 267 * 268 * - the precise formatting is up to the application! 269 * - the examples use type casts for arguments only to _show_ the types of 270 * arguments without needing variable declarations in the examples; 271 * the type casts will not be necessary in actual code 272 * 273 * UTraceDataFunc(context, fnNumber, level, 274 * "There is a character %c in the string %s.", // Format String 275 * (char)c, (const char *)s); // varargs parameters 276 * -> There is a character 0x42 'B' in the string "Bravo". 277 * 278 * UTraceDataFunc(context, fnNumber, level, 279 * "Vector of bytes %vb vector of chars %vc", 280 * (const uint8_t *)bytes, (int32_t)bytesLength, 281 * (const char *)chars, (int32_t)charsLength); 282 * -> Vector of bytes 283 * 42 63 64 3f [4] 284 * vector of chars 285 * "Bcd?"[4] 286 * 287 * UTraceDataFunc(context, fnNumber, level, 288 * "An int32_t %d and a whole bunch of them %vd", 289 * (int32_t)-5, (const int32_t *)ints, (int32_t)intsLength); 290 * -> An int32_t 0xfffffffb and a whole bunch of them 291 * fffffffb 00000005 0000010a [3] 292 * 293 */ 294 295 296 297 /** 298 * Trace output Formatter. An application's UTraceData tracing functions may call 299 * back to this function to format the trace output in a 300 * human readable form. Note that a UTraceData function may choose 301 * to not format the data; it could, for example, save it in 302 * in the raw form it was received (more compact), leaving 303 * formatting for a later trace analyis tool. 304 * @param outBuf pointer to a buffer to receive the formatted output. Output 305 * will be nul terminated if there is space in the buffer - 306 * if the length of the requested output < the output buffer size. 307 * @param capacity Length of the output buffer. 308 * @param indent Number of spaces to indent the output. Intended to allow 309 * data displayed from nested functions to be indented for readability. 310 * @param fmt Format specification for the data to output 311 * @param args Data to be formatted. 312 * @return Length of formatted output, including the terminating NUL. 313 * If buffer capacity is insufficient, the required capacity is returned. 314 * @stable ICU 2.8 315 */ 316 U_STABLE int32_t U_EXPORT2 317 utrace_vformat(char *outBuf, int32_t capacity, 318 int32_t indent, const char *fmt, va_list args); 319 320 /** 321 * Trace output Formatter. An application's UTraceData tracing functions may call 322 * this function to format any additional trace data, beyond that 323 * provided by default, in human readable form with the same 324 * formatting conventions used by utrace_vformat(). 325 * @param outBuf pointer to a buffer to receive the formatted output. Output 326 * will be nul terminated if there is space in the buffer - 327 * if the length of the requested output < the output buffer size. 328 * @param capacity Length of the output buffer. 329 * @param indent Number of spaces to indent the output. Intended to allow 330 * data displayed from nested functions to be indented for readability. 331 * @param fmt Format specification for the data to output 332 * @param ... Data to be formatted. 333 * @return Length of formatted output, including the terminating NUL. 334 * If buffer capacity is insufficient, the required capacity is returned. 335 * @stable ICU 2.8 336 */ 337 U_STABLE int32_t U_EXPORT2 338 utrace_format(char *outBuf, int32_t capacity, 339 int32_t indent, const char *fmt, ...); 340 341 342 343 /* Trace function numbers --------------------------------------------------- */ 344 345 /** 346 * Get the name of a function from its trace function number. 347 * 348 * @param fnNumber The trace number for an ICU function. 349 * @return The name string for the function. 350 * 351 * @see UTraceFunctionNumber 352 * @stable ICU 2.8 353 */ 354 U_STABLE const char * U_EXPORT2 355 utrace_functionName(int32_t fnNumber); 356 357 U_CDECL_END 358 359 #endif 360