Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnat/g-curexc.ads @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | |
| children | 84e7813d76e9 |
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| 68:561a7518be6b | 111:04ced10e8804 |
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| 1 ------------------------------------------------------------------------------ | |
| 2 -- -- | |
| 3 -- GNAT LIBRARY COMPONENTS -- | |
| 4 -- -- | |
| 5 -- G N A T . C U R R E N T _ E X C E P T I O N -- | |
| 6 -- -- | |
| 7 -- S p e c -- | |
| 8 -- -- | |
| 9 -- Copyright (C) 1996-2017, AdaCore -- | |
| 10 -- -- | |
| 11 -- GNAT is free software; you can redistribute it and/or modify it under -- | |
| 12 -- terms of the GNU General Public License as published by the Free Soft- -- | |
| 13 -- ware Foundation; either version 3, or (at your option) any later ver- -- | |
| 14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- | |
| 15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
| 16 -- or FITNESS FOR A PARTICULAR PURPOSE. -- | |
| 17 -- -- | |
| 18 -- As a special exception under Section 7 of GPL version 3, you are granted -- | |
| 19 -- additional permissions described in the GCC Runtime Library Exception, -- | |
| 20 -- version 3.1, as published by the Free Software Foundation. -- | |
| 21 -- -- | |
| 22 -- You should have received a copy of the GNU General Public License and -- | |
| 23 -- a copy of the GCC Runtime Library Exception along with this program; -- | |
| 24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- | |
| 25 -- <http://www.gnu.org/licenses/>. -- | |
| 26 -- -- | |
| 27 -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 28 -- Extensive contributions were provided by Ada Core Technologies Inc. -- | |
| 29 -- -- | |
| 30 ------------------------------------------------------------------------------ | |
| 31 | |
| 32 -- This package provides routines for obtaining the current exception | |
| 33 -- information in Ada 83 style. In Ada 83, there was no official method | |
| 34 -- for obtaining exception information, but a number of vendors supplied | |
| 35 -- routines for this purpose, and this package closely approximates the | |
| 36 -- interfaces supplied by DEC Ada 83 and VADS Ada. | |
| 37 | |
| 38 -- The routines in this package are associated with a particular exception | |
| 39 -- handler, and can only be called from within an exception handler. See | |
| 40 -- also the package GNAT.Most_Recent_Exception, which provides access to | |
| 41 -- the most recently raised exception, and is not limited to static calls | |
| 42 -- from an exception handler. | |
| 43 | |
| 44 package GNAT.Current_Exception is | |
| 45 pragma Pure; | |
| 46 | |
| 47 ----------------- | |
| 48 -- Subprograms -- | |
| 49 ----------------- | |
| 50 | |
| 51 -- Note: the lower bound of returned String values is always one | |
| 52 | |
| 53 function Exception_Information return String; | |
| 54 -- Returns the result of calling Ada.Exceptions.Exception_Information | |
| 55 -- with an argument that is the Exception_Occurrence corresponding to | |
| 56 -- the current exception. Returns the null string if called from outside | |
| 57 -- an exception handler. | |
| 58 | |
| 59 function Exception_Message return String; | |
| 60 -- Returns the result of calling Ada.Exceptions.Exception_Message with | |
| 61 -- an argument that is the Exception_Occurrence corresponding to the | |
| 62 -- current exception. Returns the null string if called from outside an | |
| 63 -- exception handler. | |
| 64 | |
| 65 function Exception_Name return String; | |
| 66 -- Returns the result of calling Ada.Exceptions.Exception_Name with | |
| 67 -- an argument that is the Exception_Occurrence corresponding to the | |
| 68 -- current exception. Returns the null string if called from outside | |
| 69 -- an exception handler. | |
| 70 | |
| 71 -- Note: all these functions return useful information only if | |
| 72 -- called statically from within an exception handler, and they | |
| 73 -- return information about the exception corresponding to the | |
| 74 -- handler in which they appear. This is NOT the same as the most | |
| 75 -- recently raised exception. Consider the example: | |
| 76 | |
| 77 -- exception | |
| 78 -- when Constraint_Error => | |
| 79 -- begin | |
| 80 -- ... | |
| 81 -- exception | |
| 82 -- when Tasking_Error => ... | |
| 83 -- end; | |
| 84 -- | |
| 85 -- -- Exception_xxx at this point returns the information about | |
| 86 -- -- the constraint error, not about any exception raised within | |
| 87 -- -- the nested block since it is the static nesting that counts. | |
| 88 | |
| 89 ----------------------------------- | |
| 90 -- Use of Library Level Renaming -- | |
| 91 ----------------------------------- | |
| 92 | |
| 93 -- For greater compatibility with existing legacy software, library | |
| 94 -- level renaming may be used to create a function with a name matching | |
| 95 -- one that is in use. For example, some versions of VADS Ada provided | |
| 96 -- a function called Current_Exception whose semantics was identical to | |
| 97 -- that of GNAT. The following library level renaming declaration: | |
| 98 | |
| 99 -- with GNAT.Current_Exception; | |
| 100 -- function Current_Exception | |
| 101 -- renames GNAT.Current_Exception.Exception_Name; | |
| 102 | |
| 103 -- placed in a file called current_exception.ads and compiled into the | |
| 104 -- application compilation environment, will make the function available | |
| 105 -- in a manner exactly compatible with that in VADS Ada 83. | |
| 106 | |
| 107 private | |
| 108 pragma Import (Intrinsic, Exception_Information); | |
| 109 pragma Import (intrinsic, Exception_Message); | |
| 110 pragma Import (Intrinsic, Exception_Name); | |
| 111 | |
| 112 end GNAT.Current_Exception; |