summaryrefslogtreecommitdiff
path: root/gcc/ada/a-exstat.adb
blob: 142065f37198676b73cc938ef4bb591324d19bc5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                     ADA.EXCEPTIONS.STREAM_ATTRIBUTES                     --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 1992-2005, Free Software Foundation, Inc.         --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
-- Boston, MA 02110-1301, USA.                                              --
--                                                                          --
-- As a special exception,  if other files  instantiate  generics from this --
-- unit, or you link  this unit with other files  to produce an executable, --
-- this  unit  does not  by itself cause  the resulting  executable  to  be --
-- covered  by the  GNU  General  Public  License.  This exception does not --
-- however invalidate  any other reasons why  the executable file  might be --
-- covered by the  GNU Public License.                                      --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

pragma Warnings (Off);
--  Allow withing of non-Preelaborated units in Ada 2005 mode where this
--  package will be categorized as Preelaborate. See AI-362 for details.
--  It is safe in the context of the run-time to violate the rules!

with System.Exception_Table;  use System.Exception_Table;
with System.Storage_Elements; use System.Storage_Elements;

pragma Warnings (On);

separate (Ada.Exceptions)
package body Stream_Attributes is

   -------------------
   -- EId_To_String --
   -------------------

   function EId_To_String (X : Exception_Id) return String is
   begin
      if X = Null_Id then
         return "";
      else
         return Exception_Name (X);
      end if;
   end EId_To_String;

   ------------------
   -- EO_To_String --
   ------------------

   --  We use the null string to represent the null occurrence, otherwise
   --  we output the Exception_Information string for the occurrence.

   function EO_To_String (X : Exception_Occurrence) return String is
   begin
      if X.Id = Null_Id then
         return "";
      else
         return Exception_Information (X);
      end if;
   end EO_To_String;

   -------------------
   -- String_To_EId --
   -------------------

   function String_To_EId (S : String) return Exception_Id is
   begin
      if S = "" then
         return Null_Id;
      else
         return Exception_Id (Internal_Exception (S));
      end if;
   end String_To_EId;

   ------------------
   -- String_To_EO --
   ------------------

   function String_To_EO (S : String) return Exception_Occurrence is
      From : Natural;
      To   : Integer;

      X    : aliased Exception_Occurrence;
      --  This is the exception occurrence we will create

      procedure Bad_EO;
      pragma No_Return (Bad_EO);
      --  Signal bad exception occurrence string

      procedure Next_String;
      --  On entry, To points to last character of previous line of the
      --  message, terminated by LF. On return, From .. To are set to
      --  specify the next string, or From > To if there are no more lines.

      procedure Bad_EO is
      begin
         Raise_Exception
           (Program_Error'Identity,
            "bad exception occurrence in stream input");

         --  The following junk raise of Program_Error is required because
         --  this is a No_Return function, and unfortunately Raise_Exception
         --  can return (this particular call can't, but the back end is not
         --  clever enough to know that).

         raise Program_Error;
      end Bad_EO;

      procedure Next_String is
      begin
         From := To + 2;

         if From < S'Last then
            To := From + 1;

            while To < S'Last - 1 loop
               if To >= S'Last then
                  Bad_EO;
               elsif S (To + 1) = ASCII.LF then
                  exit;
               else
                  To := To + 1;
               end if;
            end loop;
         end if;
      end Next_String;

   --  Start of processing for String_To_EO

   begin
      if S = "" then
         return Null_Occurrence;

      else
         X.Cleanup_Flag := False;

         To := S'First - 2;
         Next_String;

         if S (From .. From + 15) /= "Exception name: " then
            Bad_EO;
         end if;

         X.Id := Exception_Id (Internal_Exception (S (From + 16 .. To)));

         Next_String;

         if From <= To and then S (From) = 'M' then
            if S (From .. From + 8) /= "Message: " then
               Bad_EO;
            end if;

            X.Msg_Length := To - From - 8;
            X.Msg (1 .. X.Msg_Length) := S (From + 9 .. To);
            Next_String;

         else
            X.Msg_Length := 0;
         end if;

         X.Pid := 0;

         if From <= To and then S (From) = 'P' then
            if S (From .. From + 3) /= "PID:" then
               Bad_EO;
            end if;

            From := From + 5; -- skip past PID: space

            while From <= To loop
               X.Pid := X.Pid * 10 +
                          (Character'Pos (S (From)) - Character'Pos ('0'));
               From := From + 1;
            end loop;

            Next_String;
         end if;

         X.Num_Tracebacks := 0;

         if From <= To then
            if S (From .. To) /= "Call stack traceback locations:" then
               Bad_EO;
            end if;

            Next_String;
            loop
               exit when From > To;

               declare
                  Ch : Character;
                  C  : Integer_Address;
                  N  : Integer_Address;

               begin
                  if S (From) /= '0'
                    or else S (From + 1) /= 'x'
                  then
                     Bad_EO;
                  else
                     From := From + 2;
                  end if;

                  C := 0;
                  while From <= To loop
                     Ch := S (From);

                     if Ch in '0' .. '9' then
                        N :=
                          Character'Pos (S (From)) - Character'Pos ('0');

                     elsif Ch in 'a' .. 'f' then
                        N :=
                          Character'Pos (S (From)) - Character'Pos ('a') + 10;

                     elsif Ch = ' ' then
                        From := From + 1;
                        exit;

                     else
                        Bad_EO;
                     end if;

                     C := C * 16 + N;

                     From := From + 1;
                  end loop;

                  if X.Num_Tracebacks = Max_Tracebacks then
                     Bad_EO;
                  end if;

                  X.Num_Tracebacks := X.Num_Tracebacks + 1;
                  X.Tracebacks (X.Num_Tracebacks) :=
                    TBE.TB_Entry_For (To_Address (C));
               end;
            end loop;
         end if;

         --  If an exception was converted to a string, it must have
         --  already been raised, so flag it accordingly and we are done.

         X.Exception_Raised := True;
         return X;
      end if;
   end String_To_EO;

end Stream_Attributes;