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utrace.h
// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ******************************************************************************* * * Copyright (C) 2003-2013, International Business Machines * Corporation and others. All Rights Reserved. * ******************************************************************************* * file name: utrace.h * encoding: UTF-8 * tab size: 8 (not used) * indentation:4 * * created on: 2003aug06 * created by: Markus W. Scherer * * Definitions for ICU tracing/logging. * */ #ifndef __UTRACE_H__ #define __UTRACE_H__ #include <stdarg.h> #include "unicode/utypes.h" /** * \file * \brief C API: Definitions for ICU tracing/logging. * * This provides API for debugging the internals of ICU without the use of * a traditional debugger. * * By default, tracing is disabled in ICU. If you need to debug ICU with * tracing, please compile ICU with the --enable-tracing configure option. */ U_CDECL_BEGIN /** * Trace severity levels. Higher levels increase the verbosity of the trace output. * @see utrace_setLevel * @stable ICU 2.8 */ typedef enum UTraceLevel { /** Disable all tracing @stable ICU 2.8*/ UTRACE_OFF=-1, /** Trace error conditions only @stable ICU 2.8*/ UTRACE_ERROR=0, /** Trace errors and warnings @stable ICU 2.8*/ UTRACE_WARNING=3, /** Trace opens and closes of ICU services @stable ICU 2.8*/ UTRACE_OPEN_CLOSE=5, /** Trace an intermediate number of ICU operations @stable ICU 2.8*/ UTRACE_INFO=7, /** Trace the maximum number of ICU operations @stable ICU 2.8*/ UTRACE_VERBOSE=9 } UTraceLevel; /** * These are the ICU functions that will be traced when tracing is enabled. * @stable ICU 2.8 */ typedef enum UTraceFunctionNumber { UTRACE_FUNCTION_START=0, UTRACE_U_INIT=UTRACE_FUNCTION_START, UTRACE_U_CLEANUP, #ifndef U_HIDE_DEPRECATED_API /** * One more than the highest normal collation trace location. * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420. */ UTRACE_FUNCTION_LIMIT, #endif // U_HIDE_DEPRECATED_API UTRACE_CONVERSION_START=0x1000, UTRACE_UCNV_OPEN=UTRACE_CONVERSION_START, UTRACE_UCNV_OPEN_PACKAGE, UTRACE_UCNV_OPEN_ALGORITHMIC, UTRACE_UCNV_CLONE, UTRACE_UCNV_CLOSE, UTRACE_UCNV_FLUSH_CACHE, UTRACE_UCNV_LOAD, UTRACE_UCNV_UNLOAD, #ifndef U_HIDE_DEPRECATED_API /** * One more than the highest normal collation trace location. * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420. */ UTRACE_CONVERSION_LIMIT, #endif // U_HIDE_DEPRECATED_API UTRACE_COLLATION_START=0x2000, UTRACE_UCOL_OPEN=UTRACE_COLLATION_START, UTRACE_UCOL_CLOSE, UTRACE_UCOL_STRCOLL, UTRACE_UCOL_GET_SORTKEY, UTRACE_UCOL_GETLOCALE, UTRACE_UCOL_NEXTSORTKEYPART, UTRACE_UCOL_STRCOLLITER, UTRACE_UCOL_OPEN_FROM_SHORT_STRING, UTRACE_UCOL_STRCOLLUTF8, /**< @stable ICU 50 */ #ifndef U_HIDE_DEPRECATED_API /** * One more than the highest normal collation trace location. * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420. */ UTRACE_COLLATION_LIMIT, #endif // U_HIDE_DEPRECATED_API /** * The lowest resource/data location. * @stable ICU 65 */ UTRACE_UDATA_START=0x3000, /** * Indicates that a value was read from a resource bundle. Provides three * C-style strings to UTraceData: type, file name, and resource path. The * possible types are: * * - "string" (a string value was accessed) * - "binary" (a binary value was accessed) * - "intvector" (a integer vector value was accessed) * - "int" (a signed integer value was accessed) * - "uint" (a unsigned integer value was accessed) * - "get" (a path was loaded, but the value was not accessed) * - "getalias" (a path was loaded, and an alias was resolved) * * @stable ICU 65 */ UTRACE_UDATA_RESOURCE=UTRACE_UDATA_START, /** * Indicates that a resource bundle was opened. * * Provides one C-style string to UTraceData: file name. * @stable ICU 65 */ UTRACE_UDATA_BUNDLE, /** * Indicates that a data file was opened, but not *.res files. * * Provides one C-style string to UTraceData: file name. * * @stable ICU 65 */ UTRACE_UDATA_DATA_FILE, /** * Indicates that a *.res file was opened. * * This differs from UTRACE_UDATA_BUNDLE because a res file is typically * opened only once per application runtime, but the bundle corresponding * to that res file may be opened many times. * * Provides one C-style string to UTraceData: file name. * * @stable ICU 65 */ UTRACE_UDATA_RES_FILE, #ifndef U_HIDE_INTERNAL_API /** * One more than the highest normal resource/data trace location. * @internal The numeric value may change over time, see ICU ticket #12420. */ UTRACE_RES_DATA_LIMIT, #endif // U_HIDE_INTERNAL_API /** * The lowest break iterator location. * @stable ICU 67 */ UTRACE_UBRK_START=0x4000, /** * Indicates that a character instance of break iterator was created. * * @stable ICU 67 */ UTRACE_UBRK_CREATE_CHARACTER = UTRACE_UBRK_START, /** * Indicates that a word instance of break iterator was created. * * @stable ICU 67 */ UTRACE_UBRK_CREATE_WORD, /** * Indicates that a line instance of break iterator was created. * * Provides one C-style string to UTraceData: the lb value ("", * "loose", "strict", or "normal"). * * @stable ICU 67 */ UTRACE_UBRK_CREATE_LINE, /** * Indicates that a sentence instance of break iterator was created. * * @stable ICU 67 */ UTRACE_UBRK_CREATE_SENTENCE, /** * Indicates that a title instance of break iterator was created. * * @stable ICU 67 */ UTRACE_UBRK_CREATE_TITLE, /** * Indicates that an internal dictionary break engine was created. * * Provides one C-style string to UTraceData: the script code of what * the break engine cover ("Hani", "Khmr", "Laoo", "Mymr", or "Thai"). * * @stable ICU 67 */ UTRACE_UBRK_CREATE_BREAK_ENGINE, #ifndef U_HIDE_INTERNAL_API /** * One more than the highest normal break iterator trace location. * @internal The numeric value may change over time, see ICU ticket #12420. */ UTRACE_UBRK_LIMIT, #endif // U_HIDE_INTERNAL_API } UTraceFunctionNumber; /** * Setter for the trace level. * @param traceLevel A UTraceLevel value. * @stable ICU 2.8 */ U_CAPI void U_EXPORT2 utrace_setLevel(int32_t traceLevel); /** * Getter for the trace level. * @return The UTraceLevel value being used by ICU. * @stable ICU 2.8 */ U_CAPI int32_t U_EXPORT2 utrace_getLevel(void); /* Trace function pointers types ----------------------------- */ /** * Type signature for the trace function to be called when entering a function. * @param context value supplied at the time the trace functions are set. * @param fnNumber Enum value indicating the ICU function being entered. * @stable ICU 2.8 */ typedef void U_CALLCONV UTraceEntry(const void *context, int32_t fnNumber); /** * Type signature for the trace function to be called when exiting from a function. * @param context value supplied at the time the trace functions are set. * @param fnNumber Enum value indicating the ICU function being exited. * @param fmt A formatting string that describes the number and types * of arguments included with the variable args. The fmt * string has the same form as the utrace_vformat format * string. * @param args A variable arguments list. Contents are described by * the fmt parameter. * @see utrace_vformat * @stable ICU 2.8 */ typedef void U_CALLCONV UTraceExit(const void *context, int32_t fnNumber, const char *fmt, va_list args); /** * Type signature for the trace function to be called from within an ICU function * to display data or messages. * @param context value supplied at the time the trace functions are set. * @param fnNumber Enum value indicating the ICU function being exited. * @param level The current tracing level * @param fmt A format string describing the tracing data that is supplied * as variable args * @param args The data being traced, passed as variable args. * @stable ICU 2.8 */ typedef void U_CALLCONV UTraceData(const void *context, int32_t fnNumber, int32_t level, const char *fmt, va_list args); /** * Set ICU Tracing functions. Installs application-provided tracing * functions into ICU. After doing this, subsequent ICU operations * will call back to the installed functions, providing a trace * of the use of ICU. Passing a NULL pointer for a tracing function * is allowed, and inhibits tracing action at points where that function * would be called. * <p> * Tracing and Threads: Tracing functions are global to a process, and * will be called in response to ICU operations performed by any * thread. If tracing of an individual thread is desired, the * tracing functions must themselves filter by checking that the * current thread is the desired thread. * * @param context an uninterpreted pointer. Whatever is passed in * here will in turn be passed to each of the tracing * functions UTraceEntry, UTraceExit and UTraceData. * ICU does not use or alter this pointer. * @param e Callback function to be called on entry to a * a traced ICU function. * @param x Callback function to be called on exit from a * traced ICU function. * @param d Callback function to be called from within a * traced ICU function, for the purpose of providing * data to the trace. * * @stable ICU 2.8 */ U_CAPI void U_EXPORT2 utrace_setFunctions(const void *context, UTraceEntry *e, UTraceExit *x, UTraceData *d); /** * Get the currently installed ICU tracing functions. Note that a null function * pointer will be returned if no trace function has been set. * * @param context The currently installed tracing context. * @param e The currently installed UTraceEntry function. * @param x The currently installed UTraceExit function. * @param d The currently installed UTraceData function. * @stable ICU 2.8 */ U_CAPI void U_EXPORT2 utrace_getFunctions(const void **context, UTraceEntry **e, UTraceExit **x, UTraceData **d); /* * * ICU trace format string syntax * * Format Strings are passed to UTraceData functions, and define the * number and types of the trace data being passed on each call. * * The UTraceData function, which is supplied by the application, * not by ICU, can either forward the trace data (passed via * varargs) and the format string back to ICU for formatting into * a displayable string, or it can interpret the format itself, * and do as it wishes with the trace data. * * * Goals for the format string * - basic data output * - easy to use for trace programmer * - sufficient provision for data types for trace output readability * - well-defined types and binary portable APIs * * Non-goals * - printf compatibility * - fancy formatting * - argument reordering and other internationalization features * * ICU trace format strings contain plain text with argument inserts, * much like standard printf format strings. * Each insert begins with a '%', then optionally contains a 'v', * then exactly one type character. * Two '%' in a row represent a '%' instead of an insert. * The trace format strings need not have \n at the end. * * * Types * ----- * * Type characters: * - c A char character in the default codepage. * - s A NUL-terminated char * string in the default codepage. * - S A UChar * string. Requires two params, (ptr, length). Length=-1 for nul term. * - b A byte (8-bit integer). * - h A 16-bit integer. Also a 16 bit Unicode code unit. * - d A 32-bit integer. Also a 20 bit Unicode code point value. * - l A 64-bit integer. * - p A data pointer. * * Vectors * ------- * * If the 'v' is not specified, then one item of the specified type * is passed in. * If the 'v' (for "vector") is specified, then a vector of items of the * specified type is passed in, via a pointer to the first item * and an int32_t value for the length of the vector. * Length==-1 means zero or NUL termination. Works for vectors of all types. * * Note: %vS is a vector of (UChar *) strings. The strings must * be nul terminated as there is no way to provide a * separate length parameter for each string. The length * parameter (required for all vectors) is the number of * strings, not the length of the strings. * * Examples * -------- * * These examples show the parameters that will be passed to an application's * UTraceData() function for various formats. * * - the precise formatting is up to the application! * - the examples use type casts for arguments only to _show_ the types of * arguments without needing variable declarations in the examples; * the type casts will not be necessary in actual code * * UTraceDataFunc(context, fnNumber, level, * "There is a character %c in the string %s.", // Format String * (char)c, (const char *)s); // varargs parameters * -> There is a character 0x42 'B' in the string "Bravo". * * UTraceDataFunc(context, fnNumber, level, * "Vector of bytes %vb vector of chars %vc", * (const uint8_t *)bytes, (int32_t)bytesLength, * (const char *)chars, (int32_t)charsLength); * -> Vector of bytes * 42 63 64 3f [4] * vector of chars * "Bcd?"[4] * * UTraceDataFunc(context, fnNumber, level, * "An int32_t %d and a whole bunch of them %vd", * (int32_t)-5, (const int32_t *)ints, (int32_t)intsLength); * -> An int32_t 0xfffffffb and a whole bunch of them * fffffffb 00000005 0000010a [3] * */ /** * Trace output Formatter. An application's UTraceData tracing functions may call * back to this function to format the trace output in a * human readable form. Note that a UTraceData function may choose * to not format the data; it could, for example, save it in * in the raw form it was received (more compact), leaving * formatting for a later trace analysis tool. * @param outBuf pointer to a buffer to receive the formatted output. Output * will be nul terminated if there is space in the buffer - * if the length of the requested output < the output buffer size. * @param capacity Length of the output buffer. * @param indent Number of spaces to indent the output. Intended to allow * data displayed from nested functions to be indented for readability. * @param fmt Format specification for the data to output * @param args Data to be formatted. * @return Length of formatted output, including the terminating NUL. * If buffer capacity is insufficient, the required capacity is returned. * @stable ICU 2.8 */ U_CAPI int32_t U_EXPORT2 utrace_vformat(char *outBuf, int32_t capacity, int32_t indent, const char *fmt, va_list args); /** * Trace output Formatter. An application's UTraceData tracing functions may call * this function to format any additional trace data, beyond that * provided by default, in human readable form with the same * formatting conventions used by utrace_vformat(). * @param outBuf pointer to a buffer to receive the formatted output. Output * will be nul terminated if there is space in the buffer - * if the length of the requested output < the output buffer size. * @param capacity Length of the output buffer. * @param indent Number of spaces to indent the output. Intended to allow * data displayed from nested functions to be indented for readability. * @param fmt Format specification for the data to output * @param ... Data to be formatted. * @return Length of formatted output, including the terminating NUL. * If buffer capacity is insufficient, the required capacity is returned. * @stable ICU 2.8 */ U_CAPI int32_t U_EXPORT2 utrace_format(char *outBuf, int32_t capacity, int32_t indent, const char *fmt, ...); /* Trace function numbers --------------------------------------------------- */ /** * Get the name of a function from its trace function number. * * @param fnNumber The trace number for an ICU function. * @return The name string for the function. * * @see UTraceFunctionNumber * @stable ICU 2.8 */ U_CAPI const char * U_EXPORT2 utrace_functionName(int32_t fnNumber); U_CDECL_END #endif
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