File : exp_ch11.ads
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- E X P _ C H 1 1 --
6 -- --
7 -- S p e c --
8 -- --
9 -- Copyright (C) 1992-2015, Free Software Foundation, Inc. --
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. 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 COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
20 -- --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
23 -- --
24 ------------------------------------------------------------------------------
25
26 -- Expand routines for chapter 11 constructs
27
28 with Types; use Types;
29
30 package Exp_Ch11 is
31 procedure Expand_N_Exception_Declaration (N : Node_Id);
32 procedure Expand_N_Handled_Sequence_Of_Statements (N : Node_Id);
33 procedure Expand_N_Raise_Constraint_Error (N : Node_Id);
34 procedure Expand_N_Raise_Expression (N : Node_Id);
35 procedure Expand_N_Raise_Program_Error (N : Node_Id);
36 procedure Expand_N_Raise_Statement (N : Node_Id);
37 procedure Expand_N_Raise_Storage_Error (N : Node_Id);
38
39 -- Data structures for gathering information to build exception tables
40 -- See runtime routine Ada.Exceptions for full details on the format and
41 -- content of these tables.
42
43 procedure Expand_At_End_Handler (HSS : Node_Id; Blk_Id : Entity_Id);
44 -- Given handled statement sequence HSS for which the At_End_Proc field
45 -- is set, and which currently has no exception handlers, this procedure
46 -- expands the special exception handler required. This procedure also
47 -- create a new scope for the given block, if Blk_Id is not Empty.
48
49 procedure Expand_Exception_Handlers (HSS : Node_Id);
50 -- This procedure expands exception handlers, and is called as part
51 -- of the processing for Expand_N_Handled_Sequence_Of_Statements and
52 -- is also called from Expand_At_End_Handler. N is the handled sequence
53 -- of statements that has the exception handler(s) to be expanded. This
54 -- is also called to expand the special exception handler built for
55 -- accept bodies (see Exp_Ch9.Build_Accept_Body).
56
57 function Find_Local_Handler
58 (Ename : Entity_Id;
59 Nod : Node_Id) return Node_Id;
60 -- This function searches for a local exception handler that will handle
61 -- the exception named by Ename. If such a local hander exists, then the
62 -- corresponding N_Exception_Handler is returned. If no such handler is
63 -- found then Empty is returned. In order to match and return True, the
64 -- handler may not have a choice parameter specification. Nod is the raise
65 -- node that references the handler.
66
67 function Get_Local_Raise_Call_Entity return Entity_Id;
68 -- This function is provided for use by the back end in conjunction with
69 -- generation of Local_Raise calls when an exception raise is converted to
70 -- a goto statement. If Local_Raise is defined, its entity is returned,
71 -- if not, Empty is returned (in which case the call is silently skipped).
72
73 function Get_RT_Exception_Entity (R : RT_Exception_Code) return Entity_Id;
74 -- This function is provided for use by the back end in conjunction with
75 -- generation of Local_Raise calls when an exception raise is converted to
76 -- a goto statement. The argument is the reason code which would be used
77 -- to determine which Rcheck_nn procedure to call. The returned result is
78 -- the exception entity to be passed to Local_Raise.
79
80 procedure Get_RT_Exception_Name (Code : RT_Exception_Code);
81 -- This procedure is provided for use by the back end to obtain the name of
82 -- the Rcheck procedure for Code. The name is appended to Namet.Name_Buffer
83 -- without the __gnat_rcheck_ prefix.
84
85 procedure Possible_Local_Raise (N : Node_Id; E : Entity_Id);
86 -- This procedure is called whenever node N might cause the back end
87 -- to generate a local raise for a local Constraint/Program/Storage_Error
88 -- exception. It deals with generating a warning if there is no local
89 -- handler (and restriction No_Exception_Propagation is set), or if there
90 -- is a local handler marking that it has a local raise. E is the entity
91 -- of the corresponding exception.
92
93 end Exp_Ch11;