OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [gcc/] [ada/] [sem_ch13.ads] - Blame information for rev 826

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 281 jeremybenn
------------------------------------------------------------------------------
2
--                                                                          --
3
--                         GNAT COMPILER COMPONENTS                         --
4
--                                                                          --
5
--                             S E M _ C H 1 3                              --
6
--                                                                          --
7
--                                 S p e c                                  --
8
--                                                                          --
9
--          Copyright (C) 1992-2009, 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
with Types; use Types;
27
with Uintp; use Uintp;
28
 
29
package Sem_Ch13 is
30
   procedure Analyze_At_Clause                          (N : Node_Id);
31
   procedure Analyze_Attribute_Definition_Clause        (N : Node_Id);
32
   procedure Analyze_Enumeration_Representation_Clause  (N : Node_Id);
33
   procedure Analyze_Free_Statement                     (N : Node_Id);
34
   procedure Analyze_Freeze_Entity                      (N : Node_Id);
35
   procedure Analyze_Record_Representation_Clause       (N : Node_Id);
36
   procedure Analyze_Code_Statement                     (N : Node_Id);
37
 
38
   procedure Adjust_Record_For_Reverse_Bit_Order (R : Entity_Id);
39
   --  Called from Freeze where R is a record entity for which reverse bit
40
   --  order is specified and there is at least one component clause. Adjusts
41
   --  component positions according to Ada 2005 AI-133. Note that this is only
42
   --  called in Ada 2005 mode. The Ada 95 handling for bit order is entirely
43
   --  contained in Freeze.
44
 
45
   procedure Initialize;
46
   --  Initialize internal tables for new compilation
47
 
48
   procedure Set_Enum_Esize (T : Entity_Id);
49
   --  This routine sets the Esize field for an enumeration type T, based
50
   --  on the current representation information available for T. Note that
51
   --  the setting of the RM_Size field is not affected. This routine also
52
   --  initializes the alignment field to zero.
53
 
54
   function Minimum_Size
55
     (T      : Entity_Id;
56
      Biased : Boolean := False) return Nat;
57
   --  Given an elementary type, determines the minimum number of bits required
58
   --  to represent all values of the type. This function may not be called
59
   --  with any other types. If the flag Biased is set True, then the minimum
60
   --  size calculation that biased representation is used in the case of a
61
   --  discrete type, e.g. the range 7..8 gives a minimum size of 4 with
62
   --  Biased set to False, and 1 with Biased set to True. Note that the
63
   --  biased parameter only has an effect if the type is not biased, it
64
   --  causes Minimum_Size to indicate the minimum size of an object with
65
   --  the given type, of the size the type would have if it were biased. If
66
   --  the type is already biased, then Minimum_Size returns the biased size,
67
   --  regardless of the setting of Biased. Also, fixed-point types are never
68
   --  biased in the current implementation. If the size is not known at
69
   --  compile time, this function returns 0.
70
 
71
   procedure Check_Constant_Address_Clause (Expr : Node_Id; U_Ent : Entity_Id);
72
   --  Expr is an expression for an address clause. This procedure checks
73
   --  that the expression is constant, in the limited sense that it is safe
74
   --  to evaluate it at the point the object U_Ent is declared, rather than
75
   --  at the point of the address clause. The condition for this to be true
76
   --  is that the expression has no variables, no constants declared after
77
   --  U_Ent, and no calls to non-pure functions. If this condition is not
78
   --  met, then an appropriate error message is posted. This check is applied
79
   --  at the point an object with an address clause is frozen, as well as for
80
   --  address clauses for tasks and entries.
81
 
82
   procedure Check_Size
83
     (N      : Node_Id;
84
      T      : Entity_Id;
85
      Siz    : Uint;
86
      Biased : out Boolean);
87
   --  Called when size Siz is specified for subtype T. This subprogram checks
88
   --  that the size is appropriate, posting errors on node N as required.
89
   --  This check is effective for elementary types and bit-packed arrays.
90
   --  For other non-elementary types, a check is only made if an explicit
91
   --  size has been given for the type (and the specified size must match).
92
   --  The parameter Biased is set False if the size specified did not require
93
   --  the use of biased representation, and True if biased representation
94
   --  was required to meet the size requirement. Note that Biased is only
95
   --  set if the type is not currently biased, but biasing it is the only
96
   --  way to meet the requirement. If the type is currently biased, then
97
   --  this biased size is used in the initial check, and Biased is False.
98
   --  If the size is too small, and an error message is given, then both
99
   --  Esize and RM_Size are reset to the allowed minimum value in T.
100
 
101
   function Rep_Item_Too_Early (T : Entity_Id; N : Node_Id) return Boolean;
102
   --  Called at the start of processing a representation clause or a
103
   --  representation pragma. Used to check that the representation item
104
   --  is not being applied to an incomplete type or to a generic formal
105
   --  type or a type derived from a generic formal type. Returns False if
106
   --  no such error occurs. If this error does occur, appropriate error
107
   --  messages are posted on node N, and True is returned.
108
 
109
   function Rep_Item_Too_Late
110
     (T     : Entity_Id;
111
      N     : Node_Id;
112
      FOnly : Boolean := False) return Boolean;
113
   --  Called at the start of processing a representation clause or a
114
   --  representation pragma. Used to check that a representation item
115
   --  for entity T does not appear too late (according to the rules in
116
   --  RM 13.1(9) and RM 13.1(10)). N is the associated node, which in
117
   --  the pragma case is the pragma or representation clause itself, used
118
   --  for placing error messages if the item is too late.
119
   --
120
   --  Fonly is a flag that causes only the freezing rule (para 9) to be
121
   --  applied, and the tests of para 10 are skipped. This is appropriate
122
   --  for both subtype related attributes (Alignment and Size) and for
123
   --  stream attributes, which, although certainly not subtype related
124
   --  attributes, clearly should not be subject to the para 10 restrictions
125
   --  (see AI95-00137). Similarly, we also skip the para 10 restrictions for
126
   --  the Storage_Size case where they also clearly do not apply, and for
127
   --  Stream_Convert which is in the same category as the stream attributes.
128
   --
129
   --  If the rep item is too late, an appropriate message is output and
130
   --  True is returned, which is a signal that the caller should abandon
131
   --  processing for the item. If the item is not too late, then False
132
   --  is returned, and the caller can continue processing the item.
133
   --
134
   --  If no error is detected, this call also as a side effect links the
135
   --  representation item onto the head of the representation item chain
136
   --  (referenced by the First_Rep_Item field of the entity).
137
   --
138
   --  Note: Rep_Item_Too_Late must be called with the underlying type in
139
   --  the case of a private or incomplete type. The protocol is to first
140
   --  check for Rep_Item_Too_Early using the initial entity, then take the
141
   --  underlying type, then call Rep_Item_Too_Late on the result.
142
 
143
   function Same_Representation (Typ1, Typ2 : Entity_Id) return Boolean;
144
   --  Given two types, where the two types are related by possible derivation,
145
   --  determines if the two types have the same representation, or different
146
   --  representations, requiring the special processing for representation
147
   --  change. A False result is possible only for array, enumeration or
148
   --  record types.
149
 
150
   procedure Validate_Unchecked_Conversion
151
     (N        : Node_Id;
152
      Act_Unit : Entity_Id);
153
   --  Validate a call to unchecked conversion. N is the node for the actual
154
   --  instantiation, which is used only for error messages. Act_Unit is the
155
   --  entity for the instantiation, from which the actual types etc. for this
156
   --  instantiation can be determined. This procedure makes an entry in a
157
   --  table and/or generates an N_Validate_Unchecked_Conversion node. The
158
   --  actual checking is done in Validate_Unchecked_Conversions or in the
159
   --  back end as required.
160
 
161
   procedure Validate_Unchecked_Conversions;
162
   --  This routine is called after calling the backend to validate
163
   --  unchecked conversions for size and alignment appropriateness.
164
   --  The reason it is called that late is to take advantage of any
165
   --  back-annotation of size and alignment performed by the backend.
166
 
167
   procedure Validate_Address_Clauses;
168
   --  This is called after the back end has been called (and thus after the
169
   --  alignments of objects have been back annotated). It goes through the
170
   --  table of saved address clauses checking for suspicious alignments and
171
   --  if necessary issuing warnings.
172
 
173
end Sem_Ch13;

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.