1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . S T A N D A R D _ L I B R A R Y --
9 -- Copyright (C) 1992-2002 Free Software Foundation, Inc. --
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 2, 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 -- This package is included in all programs. It contains declarations that
35 -- are required to be part of every Ada program. A special mechanism is
36 -- required to ensure that these are loaded, since it may be the case in
37 -- some programs that the only references to these required packages are
38 -- from C code or from code generated directly by Gigi, an in both cases
39 -- the binder is not aware of such references.
41 -- System.Standard_Library also includes data that must be present in every
42 -- program, in particular the definitions of all the standard and also some
43 -- subprograms that must be present in every program.
45 -- The binder unconditionally includes s-stalib.ali, which ensures that this
46 -- package and the packages it references are included in all Ada programs,
47 -- together with the included data.
50 -- We must turn polling off for this unit, because otherwise we get
51 -- elaboration circularities with Ada.Exceptions if polling is on.
54 with Unchecked_Conversion
;
56 package System
.Standard_Library
is
58 pragma Suppress
(All_Checks
);
59 -- Suppress explicitely all the checks to work around the Solaris linker
60 -- bug when using gnatmake -f -a (but without -gnatp). This is not needed
61 -- with Solaris 2.6, so eventually can be removed ???
63 type Big_String_Ptr
is access all String (Positive);
64 -- A non-fat pointer type for null terminated strings
67 new Unchecked_Conversion
(System
.Address
, Big_String_Ptr
);
69 ---------------------------------------------
70 -- Type For Enumeration Image Index Tables --
71 ---------------------------------------------
73 -- Note: these types are declared at the start of this unit, since
74 -- they must appear before any enumeration types declared in this
75 -- unit. Note that the spec of system is already elaborated at
76 -- this point (since we are a child of system), which means that
77 -- enumeration types in package System cannot use these types.
79 type Image_Index_Table_8
is
80 array (Integer range <>) of Short_Short_Integer;
81 type Image_Index_Table_16
is
82 array (Integer range <>) of Short_Integer;
83 type Image_Index_Table_32
is
84 array (Integer range <>) of Integer;
85 -- These types are used to generate the index vector used for enumeration
86 -- type image tables. See spec of Exp_Imgv in the main GNAT sources for a
87 -- full description of the data structures that are used here.
89 -------------------------------------
90 -- Exception Declarations and Data --
91 -------------------------------------
93 type Raise_Action
is access procedure;
94 -- A pointer to a procedure used in the Raise_Hook field
97 type Exception_Data_Ptr
is access all Exception_Data
;
98 -- An equivalent of Exception_Id that is public
100 -- The following record defines the underlying representation of exceptions
102 -- WARNING! Any changes to this may need to be reflectd in the following
103 -- locations in the compiler and runtime code:
105 -- 1. The Internal_Exception routine in s-exctab.adb
106 -- 2. The processing in gigi that tests Not_Handled_By_Others
107 -- 3. Expand_N_Exception_Declaration in Exp_Ch11
108 -- 4. The construction of the exception type in Cstand
110 type Exception_Data
is record
111 Not_Handled_By_Others
: Boolean;
112 -- Normally set False, indicating that the exception is handled in the
113 -- usual way by others (i.e. an others handler handles the exception).
114 -- Set True to indicate that this exception is not caught by others
115 -- handlers, but must be explicitly named in a handler. This latter
116 -- setting is currently used by the Abort_Signal.
119 -- A character indicating the language raising the exception.
120 -- Set to "A" for exceptions defined by an Ada program.
121 -- Set to "V" for imported VMS exceptions.
123 Name_Length
: Natural;
124 -- Length of fully expanded name of exception
126 Full_Name
: Big_String_Ptr
;
127 -- Fully expanded name of exception, null terminated
129 HTable_Ptr
: Exception_Data_Ptr
;
130 -- Hash table pointer used to link entries together in the hash table
131 -- built (by Register_Exception in s-exctab.adb) for converting between
132 -- identities and names.
134 Import_Code
: Integer;
135 -- Value for imported exceptions. Needed only for the handling of
136 -- Import/Export_Exception for the VMS case, but present in all
137 -- implementations (we might well extend this mechanism for other
138 -- systems in the future).
140 Raise_Hook
: Raise_Action
;
141 -- This field can be used to place a "hook" on an exception. If the
142 -- value is non-null, then it points to a procedure which is called
143 -- whenever the exception is raised. This call occurs immediately,
144 -- before any other actions taken by the raise (and in particular
145 -- before any unwinding of the stack occurs).
149 -- Definitions for standard predefined exceptions defined in Standard,
151 -- Why are the Nul's necessary here, seems like they should not be
152 -- required, since Gigi is supposed to add a Nul to each name ???
154 Constraint_Error_Name
: constant String := "CONSTRAINT_ERROR" & ASCII
.NUL
;
155 Program_Error_Name
: constant String := "PROGRAM_ERROR" & ASCII
.NUL
;
156 Storage_Error_Name
: constant String := "STORAGE_ERROR" & ASCII
.NUL
;
157 Tasking_Error_Name
: constant String := "TASKING_ERROR" & ASCII
.NUL
;
158 Abort_Signal_Name
: constant String := "_ABORT_SIGNAL" & ASCII
.NUL
;
160 Numeric_Error_Name
: constant String := "NUMERIC_ERROR" & ASCII
.NUL
;
161 -- This is used only in the Ada 83 case, but it is not worth having a
162 -- separate version of s-stalib.ads for use in Ada 83 mode.
164 Constraint_Error_Def
: aliased Exception_Data
:=
165 (Not_Handled_By_Others
=> False,
167 Name_Length
=> Constraint_Error_Name
'Length,
168 Full_Name
=> To_Ptr
(Constraint_Error_Name
'Address),
173 Numeric_Error_Def
: aliased Exception_Data
:=
174 (Not_Handled_By_Others
=> False,
176 Name_Length
=> Numeric_Error_Name
'Length,
177 Full_Name
=> To_Ptr
(Numeric_Error_Name
'Address),
182 Program_Error_Def
: aliased Exception_Data
:=
183 (Not_Handled_By_Others
=> False,
185 Name_Length
=> Program_Error_Name
'Length,
186 Full_Name
=> To_Ptr
(Program_Error_Name
'Address),
191 Storage_Error_Def
: aliased Exception_Data
:=
192 (Not_Handled_By_Others
=> False,
194 Name_Length
=> Storage_Error_Name
'Length,
195 Full_Name
=> To_Ptr
(Storage_Error_Name
'Address),
200 Tasking_Error_Def
: aliased Exception_Data
:=
201 (Not_Handled_By_Others
=> False,
203 Name_Length
=> Tasking_Error_Name
'Length,
204 Full_Name
=> To_Ptr
(Tasking_Error_Name
'Address),
209 Abort_Signal_Def
: aliased Exception_Data
:=
210 (Not_Handled_By_Others
=> True,
212 Name_Length
=> Abort_Signal_Name
'Length,
213 Full_Name
=> To_Ptr
(Abort_Signal_Name
'Address),
218 pragma Export
(C
, Constraint_Error_Def
, "constraint_error");
219 pragma Export
(C
, Numeric_Error_Def
, "numeric_error");
220 pragma Export
(C
, Program_Error_Def
, "program_error");
221 pragma Export
(C
, Storage_Error_Def
, "storage_error");
222 pragma Export
(C
, Tasking_Error_Def
, "tasking_error");
223 pragma Export
(C
, Abort_Signal_Def
, "_abort_signal");
225 Local_Partition_ID
: Natural := 0;
226 -- This variable contains the local Partition_ID that will be used when
227 -- building exception occurrences. In distributed mode, it will be
228 -- set by each partition to the correct value during the elaboration.
230 type Exception_Trace_Kind
is
232 -- No particular trace is requested, only unhandled exceptions
233 -- in the environment task (following the RM) will be printed.
234 -- This is the default behavior.
237 -- Denotes every possible raise event, either explicit or due to
238 -- a specific language rule, within the context of a task or not.
241 -- Denotes the raise events corresponding to exceptions for which
242 -- there is no user defined handler.
244 -- Provide a way to denote different kinds of automatic traces related
245 -- to exceptions that can be requested.
247 Exception_Trace
: Exception_Trace_Kind
:= RM_Convention
;
248 pragma Atomic
(Exception_Trace
);
249 -- By default, follow the RM convention.
255 procedure Abort_Undefer_Direct
;
256 pragma Inline
(Abort_Undefer_Direct
);
257 -- A little procedure that just calls Abort_Undefer.all, for use in
258 -- clean up procedures, which only permit a simple subprogram name.
261 -- Performs the Ada Runtime finalization the first time it is invoked.
262 -- All subsequent calls are ignored.
264 end System
.Standard_Library
;