Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnat/g-except.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 RUN-TIME COMPONENTS -- | |
| 4 -- -- | |
| 5 -- G N A T . E X C E P T I O N S -- | |
| 6 -- -- | |
| 7 -- S p e c -- | |
| 8 -- -- | |
| 9 -- Copyright (C) 2000-2017, 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 an interface for raising predefined exceptions | |
| 33 -- with an exception message. It can be used from Pure units. | |
| 34 | |
| 35 -- There is no prohibition in Ada that prevents exceptions being raised | |
| 36 -- from within pure units. The raise statement is perfectly acceptable. | |
| 37 | |
| 38 -- However, it is not normally possible to raise an exception with a | |
| 39 -- message because the routine Ada.Exceptions.Raise_Exception is not in | |
| 40 -- a Pure unit. This is an annoying and unnecessary restriction and this | |
| 41 -- package allows for raising the standard predefined exceptions at least. | |
| 42 | |
| 43 package GNAT.Exceptions is | |
| 44 pragma Pure; | |
| 45 | |
| 46 type Exception_Type is limited null record; | |
| 47 -- Type used to specify which exception to raise | |
| 48 | |
| 49 -- Really Exception_Type is Exception_Id, but Exception_Id can't be | |
| 50 -- used directly since it is declared in the non-pure unit Ada.Exceptions, | |
| 51 | |
| 52 -- Exception_Id is in fact simply a pointer to the type Exception_Data | |
| 53 -- declared in System.Standard_Library (which is also non-pure). So what | |
| 54 -- we do is to define it here as a by reference type (any by reference | |
| 55 -- type would do), and then Import the definitions from Standard_Library. | |
| 56 -- Since this is a by reference type, these will be passed by reference, | |
| 57 -- which has the same effect as passing a pointer. | |
| 58 | |
| 59 -- This type is not private because keeping it by reference would require | |
| 60 -- defining it in a way (e.g. using a tagged type) that would drag in other | |
| 61 -- run-time files, which is unwanted in the case of e.g. Ravenscar where we | |
| 62 -- want to minimize the number of run-time files needed by default. | |
| 63 | |
| 64 CE : constant Exception_Type; -- Constraint_Error | |
| 65 PE : constant Exception_Type; -- Program_Error | |
| 66 SE : constant Exception_Type; -- Storage_Error | |
| 67 TE : constant Exception_Type; -- Tasking_Error | |
| 68 -- One of these constants is used in the call to specify the exception | |
| 69 | |
| 70 procedure Raise_Exception (E : Exception_Type; Message : String); | |
| 71 pragma Import (Ada, Raise_Exception, "__gnat_raise_exception"); | |
| 72 pragma No_Return (Raise_Exception); | |
| 73 -- Raise specified exception with specified message | |
| 74 | |
| 75 private | |
| 76 pragma Import (C, CE, "constraint_error"); | |
| 77 pragma Import (C, PE, "program_error"); | |
| 78 pragma Import (C, SE, "storage_error"); | |
| 79 pragma Import (C, TE, "tasking_error"); | |
| 80 -- References to the exception structures in the standard library | |
| 81 | |
| 82 end GNAT.Exceptions; |