xpcom/glue/nsDebug.h

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is mozilla.org code.
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Netscape Communications Corporation.
  19  * Portions created by the Initial Developer are Copyright (C) 1998
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *
  24  * Alternatively, the contents of this file may be used under the terms of
  25  * either of the GNU General Public License Version 2 or later (the "GPL"),
  26  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  27  * in which case the provisions of the GPL or the LGPL are applicable instead
  28  * of those above. If you wish to allow use of your version of this file only
  29  * under the terms of either the GPL or the LGPL, and not to allow others to
  30  * use your version of this file under the terms of the MPL, indicate your
  31  * decision by deleting the provisions above and replace them with the notice
  32  * and other provisions required by the GPL or the LGPL. If you do not delete
  33  * the provisions above, a recipient may use your version of this file under
  34  * the terms of any one of the MPL, the GPL or the LGPL.
  35  *
  36  * ***** END LICENSE BLOCK ***** */
  37
  38 #ifndef nsDebug_h___
  39 #define nsDebug_h___
  40
  41 #ifndef nscore_h___
  42 #include "nscore.h"
  43 #endif
  44
  45 #ifndef nsError_h__
  46 #include "nsError.h"
  47 #endif
  48
  49 #include "nsXPCOM.h"
  50
  51 #ifdef DEBUG
  52 #define NS_DEBUG
  53 #include "prprf.h"
  54 #endif
  55
  56 #ifdef DEBUG
  57
  58 /**
  59  * Abort the execution of the program if the expression evaluates to
  60  * false.
  61  *
  62  * There is no status value returned from the macro.
  63  *
  64  * Note that the non-debug version of this macro does <b>not</b>
  65  * evaluate the expression argument. Hence side effect statements
  66  * as arguments to the macro will yield improper execution in a
  67  * non-debug build. For example:
  68  *
  69  *      NS_ABORT_IF_FALSE(0 == foo++, "yikes foo should be zero");
  70  *
  71  * Note also that the non-debug version of this macro does <b>not</b>
  72  * evaluate the message argument.
  73  */
  74 #define NS_ABORT_IF_FALSE(_expr, _msg)                        \
  75   PR_BEGIN_MACRO                                              \
  76     if (!(_expr)) {                                           \
  77       NS_DebugBreak(NS_DEBUG_ABORT, _msg, #_expr, __FILE__, __LINE__); \
  78     }                                                         \
  79   PR_END_MACRO
  80
  81 /**
  82  * Warn if a given condition is false.
  83  *
  84  * Program execution continues past the usage of this macro.
  85  *
  86  * Note also that the non-debug version of this macro does <b>not</b>
  87  * evaluate the message argument.
  88  */
  89 #define NS_WARN_IF_FALSE(_expr,_msg)                          \
  90   PR_BEGIN_MACRO                                              \
  91     if (!(_expr)) {                                           \
  92       NS_DebugBreak(NS_DEBUG_WARNING, _msg, #_expr, __FILE__, __LINE__); \
  93     }                                                         \
  94   PR_END_MACRO
  95
  96 /**
  97  * Test a precondition for truth. If the expression is not true then
  98  * trigger a program failure.
  99  */
 100 #define NS_PRECONDITION(expr, str)                            \
 101   PR_BEGIN_MACRO                                              \
 102     if (!(expr)) {                                            \
 103       NS_DebugBreak(NS_DEBUG_ASSERTION, str, #expr, __FILE__, __LINE__); \
 104     }                                                         \
 105   PR_END_MACRO
 106
 107 /**
 108  * Test an assertion for truth. If the expression is not true then
 109  * trigger a program failure.
 110  */
 111 #define NS_ASSERTION(expr, str)                               \
 112   PR_BEGIN_MACRO                                              \
 113     if (!(expr)) {                                            \
 114       NS_DebugBreak(NS_DEBUG_ASSERTION, str, #expr, __FILE__, __LINE__); \
 115     }                                                         \
 116   PR_END_MACRO
 117
 118 /**
 119  * Test a post-condition for truth. If the expression is not true then
 120  * trigger a program failure.
 121  */
 122 #define NS_POSTCONDITION(expr, str)                           \
 123   PR_BEGIN_MACRO                                              \
 124     if (!(expr)) {                                            \
 125       NS_DebugBreak(NS_DEBUG_ASSERTION, str, #expr, __FILE__, __LINE__); \
 126     }                                                         \
 127   PR_END_MACRO
 128
 129 /**
 130  * This macros triggers a program failure if executed. It indicates that
 131  * an attempt was made to execute some unimplemented functionality.
 132  */
 133 #define NS_NOTYETIMPLEMENTED(str)                             \
 134   NS_DebugBreak(NS_DEBUG_ASSERTION, str, "NotYetImplemented", __FILE__, __LINE__)
 135
 136 /**
 137  * This macros triggers a program failure if executed. It indicates that
 138  * an attempt was made to execute some unimplemented functionality.
 139  */
 140 #define NS_NOTREACHED(str)                                    \
 141   NS_DebugBreak(NS_DEBUG_ASSERTION, str, "Not Reached", __FILE__, __LINE__)
 142
 143 /**
 144  * Log an error message.
 145  */
 146 #define NS_ERROR(str)                                         \
 147   NS_DebugBreak(NS_DEBUG_ASSERTION, str, "Error", __FILE__, __LINE__)
 148
 149 /**
 150  * Log a warning message.
 151  */
 152 #define NS_WARNING(str)                                       \
 153   NS_DebugBreak(NS_DEBUG_WARNING, str, nsnull, __FILE__, __LINE__)
 154
 155 /**
 156  * Trigger an abort
 157  */
 158 #define NS_ABORT()                                            \
 159   NS_DebugBreak(NS_DEBUG_ABORT, nsnull, nsnull, __FILE__, __LINE__)
 160
 161 /**
 162  * Cause a break
 163  */
 164 #define NS_BREAK()                                            \
 165   NS_DebugBreak(NS_DEBUG_BREAK, nsnull, nsnull, __FILE__, __LINE__)
 166
 167 #else /* NS_DEBUG */
 168
 169 /**
 170  * The non-debug version of these macros do not evaluate the
 171  * expression or the message arguments to the macro.
 172  */
 173 #define NS_ABORT_IF_FALSE(_expr, _msg) PR_BEGIN_MACRO /* nothing */ PR_END_MACRO
 174 #define NS_WARN_IF_FALSE(_expr, _msg)  PR_BEGIN_MACRO /* nothing */ PR_END_MACRO
 175 #define NS_PRECONDITION(expr, str)     PR_BEGIN_MACRO /* nothing */ PR_END_MACRO
 176 #define NS_ASSERTION(expr, str)        PR_BEGIN_MACRO /* nothing */ PR_END_MACRO
 177 #define NS_POSTCONDITION(expr, str)    PR_BEGIN_MACRO /* nothing */ PR_END_MACRO
 178 #define NS_NOTYETIMPLEMENTED(str)      PR_BEGIN_MACRO /* nothing */ PR_END_MACRO
 179 #define NS_NOTREACHED(str)             PR_BEGIN_MACRO /* nothing */ PR_END_MACRO
 180 #define NS_ERROR(str)                  PR_BEGIN_MACRO /* nothing */ PR_END_MACRO
 181 #define NS_WARNING(str)                PR_BEGIN_MACRO /* nothing */ PR_END_MACRO
 182 #define NS_ABORT()                     PR_BEGIN_MACRO /* nothing */ PR_END_MACRO
 183 #define NS_BREAK()                     PR_BEGIN_MACRO /* nothing */ PR_END_MACRO
 184
 185 #endif /* ! NS_DEBUG */
 186
 187 /* Macros for checking the trueness of an expression passed in within an
 188  * interface implementation.  These need to be compiled regardless of the */
 189 /* NS_DEBUG flag
 190 ******************************************************************************/
 191
 192 #define NS_ENSURE_TRUE(x, ret)                                \
 193   PR_BEGIN_MACRO                                              \
 194     if (NS_UNLIKELY(!(x))) {                                  \
 195        NS_WARNING("NS_ENSURE_TRUE(" #x ") failed");           \
 196        return ret;                                            \
 197     }                                                         \
 198   PR_END_MACRO
 199
 200 #define NS_ENSURE_FALSE(x, ret)                               \
 201   NS_ENSURE_TRUE(!(x), ret)
 202
 203 /******************************************************************************
 204 ** Macros for checking results
 205 ******************************************************************************/
 206
 207 #if defined(DEBUG) && !defined(XPCOM_GLUE_AVOID_NSPR)
 208
 209 #define NS_ENSURE_SUCCESS_BODY(res, ret)                                  \
 210     char *msg = PR_smprintf("NS_ENSURE_SUCCESS(%s, %s) failed with "      \
 211                             "result 0x%X", #res, #ret, __rv);             \
 212     NS_WARNING(msg);                                                      \
 213     PR_smprintf_free(msg);
 214
 215 #else
 216
 217 #define NS_ENSURE_SUCCESS_BODY(res, ret)                                  \
 218     NS_WARNING("NS_ENSURE_SUCCESS(" #res ", " #ret ") failed");
 219
 220 #endif
 221
 222 #define NS_ENSURE_SUCCESS(res, ret)                                       \
 223   PR_BEGIN_MACRO                                                          \
 224     nsresult __rv = res; /* Don't evaluate |res| more than once */        \
 225     if (NS_FAILED(__rv)) {                                                \
 226       NS_ENSURE_SUCCESS_BODY(res, ret)                                    \
 227       return ret;                                                         \
 228     }                                                                     \
 229   PR_END_MACRO
 230
 231 /******************************************************************************
 232 ** Macros for checking state and arguments upon entering interface boundaries
 233 ******************************************************************************/
 234
 235 #define NS_ENSURE_ARG(arg)                                    \
 236   NS_ENSURE_TRUE(arg, NS_ERROR_INVALID_ARG)
 237
 238 #define NS_ENSURE_ARG_POINTER(arg)                            \
 239   NS_ENSURE_TRUE(arg, NS_ERROR_INVALID_POINTER)
 240
 241 #define NS_ENSURE_ARG_MIN(arg, min)                           \
 242   NS_ENSURE_TRUE((arg) >= min, NS_ERROR_INVALID_ARG)
 243
 244 #define NS_ENSURE_ARG_MAX(arg, max)                           \
 245   NS_ENSURE_TRUE((arg) <= max, NS_ERROR_INVALID_ARG)
 246
 247 #define NS_ENSURE_ARG_RANGE(arg, min, max)                    \
 248   NS_ENSURE_TRUE(((arg) >= min) && ((arg) <= max), NS_ERROR_INVALID_ARG)
 249
 250 #define NS_ENSURE_STATE(state)                                \
 251   NS_ENSURE_TRUE(state, NS_ERROR_UNEXPECTED)
 252
 253 #define NS_ENSURE_NO_AGGREGATION(outer)                       \
 254   NS_ENSURE_FALSE(outer, NS_ERROR_NO_AGGREGATION)
 255
 256 #define NS_ENSURE_PROPER_AGGREGATION(outer, iid)              \
 257   NS_ENSURE_FALSE(outer && !iid.Equals(NS_GET_IID(nsISupports)), NS_ERROR_INVALID_ARG)
 258
 259 /*****************************************************************************/
 260
 261 #ifdef XPCOM_GLUE
 262 #define NS_CheckThreadSafe
 263 #else
 264 #define NS_CheckThreadSafe(owningThread, msg)                 \
 265   NS_ASSERTION(owningThread == PR_GetCurrentThread(), msg)
 266 #endif
 267
 268 /* When compiling the XPCOM Glue on Windows, we pretend that it's going to
 269  * be linked with a static CRT (-MT) even when it's not. This means that we
 270  * cannot link to data exports from the CRT, only function exports. So,
 271  * instead of referencing "stderr" directly, use fdopen.
 272  */
 273 PR_BEGIN_EXTERN_C
 274
 275 NS_COM_GLUE void
 276 printf_stderr(const char *fmt, ...);
 277
 278 PR_END_EXTERN_C
 279
 280 #endif /* nsDebug_h___ */