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
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- P A R . C H 7 --
-- --
-- B o d y --
-- --
-- --
-- Copyright (C) 1992-2001 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, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
pragma Style_Checks (All_Checks);
-- Turn off subprogram body ordering check. Subprograms are in order
-- by RM section rather than alphabetical
separate (Par)
package body Ch7 is
---------------------------------------------
-- 7.1 Package (also 8.5.3, 10.1.3, 12.3) --
---------------------------------------------
-- This routine scans out a package declaration, package body, or a
-- renaming declaration or generic instantiation starting with PACKAGE
-- PACKAGE_DECLARATION ::= PACKAGE_SPECIFICATION;
-- PACKAGE_SPECIFICATION ::=
-- package DEFINING_PROGRAM_UNIT_NAME is
-- {BASIC_DECLARATIVE_ITEM}
-- [private
-- {BASIC_DECLARATIVE_ITEM}]
-- end [[PARENT_UNIT_NAME .] IDENTIFIER]
-- PACKAGE_BODY ::=
-- package body DEFINING_PROGRAM_UNIT_NAME is
-- DECLARATIVE_PART
-- [begin
-- HANDLED_SEQUENCE_OF_STATEMENTS]
-- end [[PARENT_UNIT_NAME .] IDENTIFIER]
-- PACKAGE_RENAMING_DECLARATION ::=
-- package DEFINING_IDENTIFIER renames package_NAME;
-- PACKAGE_BODY_STUB ::=
-- package body DEFINING_IDENTIFIER is separate;
-- The value in Pf_Flags indicates which of these possible declarations
-- is acceptable to the caller:
-- Pf_Flags.Spcn Set if specification OK
-- Pf_Flags.Decl Set if declaration OK
-- Pf_Flags.Gins Set if generic instantiation OK
-- Pf_Flags.Pbod Set if proper body OK
-- Pf_Flags.Rnam Set if renaming declaration OK
-- Pf_Flags.Stub Set if body stub OK
-- If an inappropriate form is encountered, it is scanned out but an
-- error message indicating that it is appearing in an inappropriate
-- context is issued. The only possible settings for Pf_Flags are those
-- defined as constants in package Par.
-- Note: in all contexts where a package specification is required, there
-- is a terminating semicolon. This semicolon is scanned out in the case
-- where Pf_Flags is set to Pf_Spcn, even though it is not strictly part
-- of the package specification (it's just too much trouble, and really
-- quite unnecessary, to deal with scanning out an END where the semicolon
-- after the END is not considered to be part of the END.
-- The caller has checked that the initial token is PACKAGE
-- Error recovery: cannot raise Error_Resync
function P_Package (Pf_Flags : Pf_Rec) return Node_Id is
Package_Node : Node_Id;
Specification_Node : Node_Id;
Name_Node : Node_Id;
Package_Sloc : Source_Ptr;
begin
Push_Scope_Stack;
Scope.Table (Scope.Last).Etyp := E_Name;
Scope.Table (Scope.Last).Ecol := Start_Column;
Scope.Table (Scope.Last).Lreq := False;
Package_Sloc := Token_Ptr;
Scan; -- past PACKAGE
if Token = Tok_Type then
Error_Msg_SC ("TYPE not allowed here");
Scan; -- past TYPE
end if;
-- Case of package body. Note that we demand a package body if that
-- is the only possibility (even if the BODY keyword is not present)
if Token = Tok_Body or else Pf_Flags = Pf_Pbod then
if not Pf_Flags.Pbod then
Error_Msg_SC ("package body cannot appear here!");
end if;
T_Body;
Name_Node := P_Defining_Program_Unit_Name;
Scope.Table (Scope.Last).Labl := Name_Node;
TF_Is;
if Separate_Present then
if not Pf_Flags.Stub then
Error_Msg_SC ("body stub cannot appear here!");
end if;
Scan; -- past SEPARATE
TF_Semicolon;
Pop_Scope_Stack;
Package_Node := New_Node (N_Package_Body_Stub, Package_Sloc);
Set_Defining_Identifier (Package_Node, Name_Node);
else
Package_Node := New_Node (N_Package_Body, Package_Sloc);
Set_Defining_Unit_Name (Package_Node, Name_Node);
Parse_Decls_Begin_End (Package_Node);
end if;
return Package_Node;
-- Cases other than Package_Body
else
Name_Node := P_Defining_Program_Unit_Name;
Scope.Table (Scope.Last).Labl := Name_Node;
-- Case of renaming declaration
Check_Misspelling_Of (Tok_Renames);
if Token = Tok_Renames then
if not Pf_Flags.Rnam then
Error_Msg_SC ("renaming declaration cannot appear here!");
end if;
Scan; -- past RENAMES;
Package_Node :=
New_Node (N_Package_Renaming_Declaration, Package_Sloc);
Set_Defining_Unit_Name (Package_Node, Name_Node);
Set_Name (Package_Node, P_Qualified_Simple_Name);
No_Constraint;
TF_Semicolon;
Pop_Scope_Stack;
return Package_Node;
else
TF_Is;
-- Case of generic instantiation
if Token = Tok_New then
if not Pf_Flags.Gins then
Error_Msg_SC
("generic instantiation cannot appear here!");
end if;
Scan; -- past NEW
Package_Node :=
New_Node (N_Package_Instantiation, Package_Sloc);
Set_Defining_Unit_Name (Package_Node, Name_Node);
Set_Name (Package_Node, P_Qualified_Simple_Name);
Set_Generic_Associations
(Package_Node, P_Generic_Actual_Part_Opt);
TF_Semicolon;
Pop_Scope_Stack;
-- Case of package declaration or package specification
else
Specification_Node :=
New_Node (N_Package_Specification, Package_Sloc);
Set_Defining_Unit_Name (Specification_Node, Name_Node);
Set_Visible_Declarations
(Specification_Node, P_Basic_Declarative_Items);
if Token = Tok_Private then
Error_Msg_Col := Scope.Table (Scope.Last).Ecol;
if Style.RM_Column_Check then
if Token_Is_At_Start_Of_Line
and then Start_Column /= Error_Msg_Col
then
Error_Msg_SC
("(style) PRIVATE in wrong column, should be@");
end if;
end if;
Scan; -- past PRIVATE
Set_Private_Declarations
(Specification_Node, P_Basic_Declarative_Items);
-- Deal gracefully with multiple PRIVATE parts
while Token = Tok_Private loop
Error_Msg_SC
("only one private part allowed per package");
Scan; -- past PRIVATE
Append_List (P_Basic_Declarative_Items,
Private_Declarations (Specification_Node));
end loop;
end if;
if Pf_Flags = Pf_Spcn then
Package_Node := Specification_Node;
else
Package_Node :=
New_Node (N_Package_Declaration, Package_Sloc);
Set_Specification (Package_Node, Specification_Node);
end if;
if Token = Tok_Begin then
Error_Msg_SC ("begin block not allowed in package spec");
Scan; -- past BEGIN
Discard_Junk_List (P_Sequence_Of_Statements (SS_None));
end if;
End_Statements (Specification_Node);
end if;
return Package_Node;
end if;
end if;
end P_Package;
------------------------------
-- 7.1 Package Declaration --
------------------------------
-- Parsed by P_Package (7.1)
--------------------------------
-- 7.1 Package Specification --
--------------------------------
-- Parsed by P_Package (7.1)
-----------------------
-- 7.1 Package Body --
-----------------------
-- Parsed by P_Package (7.1)
-----------------------------------
-- 7.3 Private Type Declaration --
-----------------------------------
-- Parsed by P_Type_Declaration (3.2.1)
----------------------------------------
-- 7.3 Private Extension Declaration --
----------------------------------------
-- Parsed by P_Type_Declaration (3.2.1)
end Ch7;
|
