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
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S E M _ M A P S --
-- --
-- B o d y --
-- --
-- Copyright (C) 1996-2007, 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 3, 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 COPYING3. If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with Atree; use Atree;
with Einfo; use Einfo;
with Namet; use Namet;
with Output; use Output;
with Sinfo; use Sinfo;
with Uintp; use Uintp;
package body Sem_Maps is
-----------------------
-- Local Subprograms --
-----------------------
function Find_Assoc (M : Map; E : Entity_Id) return Assoc_Index;
-- Standard hash table search. M is the map to be searched, E is the
-- entity to be searched for, and Assoc_Index is the resulting
-- association, or is set to No_Assoc if there is no association.
function Find_Header_Size (N : Int) return Header_Index;
-- Find largest power of two smaller than the number of entries in
-- the table. This load factor of 2 may be adjusted later if needed.
procedure Write_Map (E : Entity_Id);
pragma Warnings (Off, Write_Map);
-- For debugging purposes
---------------------
-- Add_Association --
---------------------
procedure Add_Association
(M : Map;
O_Id : Entity_Id;
N_Id : Entity_Id;
Kind : Scope_Kind := S_Local)
is
Info : constant Map_Info := Maps_Table.Table (M);
Offh : constant Header_Index := Info.Header_Offset;
Offs : constant Header_Index := Info.Header_Num;
J : constant Header_Index := Header_Index (O_Id) mod Offs;
K : constant Assoc_Index := Info.Assoc_Next;
begin
Associations_Table.Table (K) := (O_Id, N_Id, Kind, No_Assoc);
Maps_Table.Table (M).Assoc_Next := K + 1;
if Headers_Table.Table (Offh + J) /= No_Assoc then
-- Place new association at head of chain
Associations_Table.Table (K).Next := Headers_Table.Table (Offh + J);
end if;
Headers_Table.Table (Offh + J) := K;
end Add_Association;
------------------------
-- Build_Instance_Map --
------------------------
function Build_Instance_Map (M : Map) return Map is
Info : constant Map_Info := Maps_Table.Table (M);
Res : constant Map := New_Map (Int (Info.Assoc_Num));
Offh1 : constant Header_Index := Info.Header_Offset;
Offa1 : constant Assoc_Index := Info.Assoc_Offset;
Offh2 : constant Header_Index := Maps_Table.Table (Res).Header_Offset;
Offa2 : constant Assoc_Index := Maps_Table.Table (Res).Assoc_Offset;
A : Assoc;
A_Index : Assoc_Index;
begin
for J in 0 .. Info.Header_Num - 1 loop
A_Index := Headers_Table.Table (Offh1 + J);
if A_Index /= No_Assoc then
Headers_Table.Table (Offh2 + J) := A_Index + (Offa2 - Offa1);
end if;
end loop;
for J in 0 .. Info.Assoc_Num - 1 loop
A := Associations_Table.Table (Offa1 + J);
-- For local entities that come from source, create the
-- corresponding local entities in the instance. Entities that
-- do not come from source are etypes, and new ones will be
-- generated when analyzing the instance.
if No (A.New_Id)
and then A.Kind = S_Local
and then Comes_From_Source (A.Old_Id)
then
A.New_Id := New_Copy (A.Old_Id);
A.New_Id := New_Entity (Nkind (A.Old_Id), Sloc (A.Old_Id));
Set_Chars (A.New_Id, Chars (A.Old_Id));
end if;
if A.Next /= No_Assoc then
A.Next := A.Next + (Offa2 - Offa1);
end if;
Associations_Table.Table (Offa2 + J) := A;
end loop;
Maps_Table.Table (Res).Assoc_Next := Associations_Table.Last;
return Res;
end Build_Instance_Map;
-------------
-- Compose --
-------------
function Compose (Orig_Map : Map; New_Map : Map) return Map is
Res : constant Map := Copy (Orig_Map);
Off : constant Assoc_Index := Maps_Table.Table (Res).Assoc_Offset;
A : Assoc;
K : Assoc_Index;
begin
-- Iterate over the contents of Orig_Map, looking for entities
-- that are further mapped under New_Map.
for J in 0 .. Maps_Table.Table (Res).Assoc_Num - 1 loop
A := Associations_Table.Table (Off + J);
K := Find_Assoc (New_Map, A.New_Id);
if K /= No_Assoc then
Associations_Table.Table (Off + J).New_Id
:= Associations_Table.Table (K).New_Id;
end if;
end loop;
return Res;
end Compose;
----------
-- Copy --
----------
function Copy (M : Map) return Map is
Info : constant Map_Info := Maps_Table.Table (M);
Res : constant Map := New_Map (Int (Info.Assoc_Num));
Offh1 : constant Header_Index := Info.Header_Offset;
Offa1 : constant Assoc_Index := Info.Assoc_Offset;
Offh2 : constant Header_Index := Maps_Table.Table (Res).Header_Offset;
Offa2 : constant Assoc_Index := Maps_Table.Table (Res).Assoc_Offset;
A : Assoc;
A_Index : Assoc_Index;
begin
for J in 0 .. Info.Header_Num - 1 loop
A_Index := Headers_Table.Table (Offh1 + J) + (Offa2 - Offa1);
if A_Index /= No_Assoc then
Headers_Table.Table (Offh2 + J) := A_Index + (Offa2 - Offa1);
end if;
end loop;
for J in 0 .. Info.Assoc_Num - 1 loop
A := Associations_Table.Table (Offa1 + J);
A.Next := A.Next + (Offa2 - Offa1);
Associations_Table.Table (Offa2 + J) := A;
end loop;
Maps_Table.Table (Res).Assoc_Next := Associations_Table.Last;
return Res;
end Copy;
----------------
-- Find_Assoc --
----------------
function Find_Assoc (M : Map; E : Entity_Id) return Assoc_Index is
Offh : constant Header_Index := Maps_Table.Table (M).Header_Offset;
Offs : constant Header_Index := Maps_Table.Table (M).Header_Num;
J : constant Header_Index := Header_Index (E) mod Offs;
A : Assoc;
A_Index : Assoc_Index;
begin
A_Index := Headers_Table.Table (Offh + J);
if A_Index = No_Assoc then
return A_Index;
else
A := Associations_Table.Table (A_Index);
while Present (A.Old_Id) loop
if A.Old_Id = E then
return A_Index;
elsif A.Next = No_Assoc then
return No_Assoc;
else
A_Index := A.Next;
A := Associations_Table.Table (A.Next);
end if;
end loop;
return No_Assoc;
end if;
end Find_Assoc;
----------------------
-- Find_Header_Size --
----------------------
function Find_Header_Size (N : Int) return Header_Index is
Siz : Header_Index;
begin
Siz := 2;
while 2 * Siz < Header_Index (N) loop
Siz := 2 * Siz;
end loop;
return Siz;
end Find_Header_Size;
------------
-- Lookup --
------------
function Lookup (M : Map; E : Entity_Id) return Entity_Id is
Offh : constant Header_Index := Maps_Table.Table (M).Header_Offset;
Offs : constant Header_Index := Maps_Table.Table (M).Header_Num;
J : constant Header_Index := Header_Index (E) mod Offs;
A : Assoc;
begin
if Headers_Table.Table (Offh + J) = No_Assoc then
return Empty;
else
A := Associations_Table.Table (Headers_Table.Table (Offh + J));
while Present (A.Old_Id) loop
if A.Old_Id = E then
return A.New_Id;
elsif A.Next = No_Assoc then
return Empty;
else
A := Associations_Table.Table (A.Next);
end if;
end loop;
return Empty;
end if;
end Lookup;
-------------
-- New_Map --
-------------
function New_Map (Num_Assoc : Int) return Map is
Header_Size : constant Header_Index := Find_Header_Size (Num_Assoc);
Res : Map_Info;
begin
-- Allocate the tables for the new map at the current end of the
-- global tables.
Associations_Table.Increment_Last;
Headers_Table.Increment_Last;
Maps_Table.Increment_Last;
Res.Header_Offset := Headers_Table.Last;
Res.Header_Num := Header_Size;
Res.Assoc_Offset := Associations_Table.Last;
Res.Assoc_Next := Associations_Table.Last;
Res.Assoc_Num := Assoc_Index (Num_Assoc);
Headers_Table.Set_Last (Headers_Table.Last + Header_Size);
Associations_Table.Set_Last
(Associations_Table.Last + Assoc_Index (Num_Assoc));
Maps_Table.Table (Maps_Table.Last) := Res;
for J in 1 .. Header_Size loop
Headers_Table.Table (Headers_Table.Last - J) := No_Assoc;
end loop;
return Maps_Table.Last;
end New_Map;
------------------------
-- Update_Association --
------------------------
procedure Update_Association
(M : Map;
O_Id : Entity_Id;
N_Id : Entity_Id;
Kind : Scope_Kind := S_Local)
is
J : constant Assoc_Index := Find_Assoc (M, O_Id);
begin
Associations_Table.Table (J).New_Id := N_Id;
Associations_Table.Table (J).Kind := Kind;
end Update_Association;
---------------
-- Write_Map --
---------------
procedure Write_Map (E : Entity_Id) is
M : constant Map := Map (UI_To_Int (Renaming_Map (E)));
Info : constant Map_Info := Maps_Table.Table (M);
Offh : constant Header_Index := Info.Header_Offset;
Offa : constant Assoc_Index := Info.Assoc_Offset;
A : Assoc;
begin
Write_Str ("Size : ");
Write_Int (Int (Info.Assoc_Num));
Write_Eol;
Write_Str ("Headers");
Write_Eol;
for J in 0 .. Info.Header_Num - 1 loop
Write_Int (Int (Offh + J));
Write_Str (" : ");
Write_Int (Int (Headers_Table.Table (Offh + J)));
Write_Eol;
end loop;
for J in 0 .. Info.Assoc_Num - 1 loop
A := Associations_Table.Table (Offa + J);
Write_Int (Int (Offa + J));
Write_Str (" : ");
Write_Name (Chars (A.Old_Id));
Write_Str (" ");
Write_Int (Int (A.Old_Id));
Write_Str (" ==> ");
Write_Int (Int (A.New_Id));
Write_Str (" next = ");
Write_Int (Int (A.Next));
Write_Eol;
end loop;
end Write_Map;
end Sem_Maps;
|
