aboutsummaryrefslogtreecommitdiffstats
path: root/gcc-4.9/gcc/gcov.c
blob: 52016d3b40accc0a947dc29081db4b6ac1557738 (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
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
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
/* Gcov.c: prepend line execution counts and branch probabilities to a
   source file.
   Copyright (C) 1990-2014 Free Software Foundation, Inc.
   Contributed by James E. Wilson of Cygnus Support.
   Mangled by Bob Manson of Cygnus Support.
   Mangled further by Nathan Sidwell <nathan@codesourcery.com>

Gcov is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

Gcov is distributed in the hope that it will be useful,
but WITHOUT 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
along with Gcov; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

/* ??? Print a list of the ten blocks with the highest execution counts,
   and list the line numbers corresponding to those blocks.  Also, perhaps
   list the line numbers with the highest execution counts, only printing
   the first if there are several which are all listed in the same block.  */

/* ??? Should have an option to print the number of basic blocks, and the
   percent of them that are covered.  */

/* Need an option to show individual block counts, and show
   probabilities of fall through arcs.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "intl.h"
#include "diagnostic.h"
#include "version.h"
#include "demangle.h"

#include <getopt.h>

#define IN_GCOV 1
#include "gcov-io.h"
#include "gcov-io.c"

/* The gcno file is generated by -ftest-coverage option. The gcda file is
   generated by a program compiled with -fprofile-arcs. Their formats
   are documented in gcov-io.h.  */

/* The functions in this file for creating and solution program flow graphs
   are very similar to functions in the gcc source file profile.c.  In
   some places we make use of the knowledge of how profile.c works to
   select particular algorithms here.  */

/* The code validates that the profile information read in corresponds
   to the code currently being compiled.  Rather than checking for
   identical files, the code below compares a checksum on the CFG
   (based on the order of basic blocks and the arcs in the CFG).  If
   the CFG checksum in the gcda file match the CFG checksum in the
   gcno file, the profile data will be used.  */

/* This is the size of the buffer used to read in source file lines.  */

struct function_info;
struct block_info;
struct source_info;

/* Describes an arc between two basic blocks.  */

typedef struct arc_info
{
  /* source and destination blocks.  */
  struct block_info *src;
  struct block_info *dst;

  /* transition counts.  */
  gcov_type count;
  /* used in cycle search, so that we do not clobber original counts.  */
  gcov_type cs_count;

  unsigned int count_valid : 1;
  unsigned int on_tree : 1;
  unsigned int fake : 1;
  unsigned int fall_through : 1;

  /* Arc to a catch handler.  */
  unsigned int is_throw : 1;

  /* Arc is for a function that abnormally returns.  */
  unsigned int is_call_non_return : 1;

  /* Arc is for catch/setjmp.  */
  unsigned int is_nonlocal_return : 1;

  /* Is an unconditional branch.  */
  unsigned int is_unconditional : 1;

  /* Loop making arc.  */
  unsigned int cycle : 1;

  /* Next branch on line.  */
  struct arc_info *line_next;

  /* Links to next arc on src and dst lists.  */
  struct arc_info *succ_next;
  struct arc_info *pred_next;
} arc_t;

/* Describes a basic block. Contains lists of arcs to successor and
   predecessor blocks.  */

typedef struct block_info
{
  /* Chain of exit and entry arcs.  */
  arc_t *succ;
  arc_t *pred;

  /* Number of unprocessed exit and entry arcs.  */
  gcov_type num_succ;
  gcov_type num_pred;

  /* Block execution count.  */
  gcov_type count;
  unsigned flags : 12;
  unsigned count_valid : 1;
  unsigned valid_chain : 1;
  unsigned invalid_chain : 1;
  unsigned exceptional : 1;

  /* Block is a call instrumenting site.  */
  unsigned is_call_site : 1; /* Does the call.  */
  unsigned is_call_return : 1; /* Is the return.  */

  /* Block is a landing pad for longjmp or throw.  */
  unsigned is_nonlocal_return : 1;

  union
  {
    struct
    {
     /* Array of line numbers and source files. source files are
        introduced by a linenumber of zero, the next 'line number' is
        the number of the source file.  Always starts with a source
        file.  */
      unsigned *encoding;
      unsigned num;
    } line; /* Valid until blocks are linked onto lines */
    struct
    {
      /* Single line graph cycle workspace.  Used for all-blocks
	 mode.  */
      arc_t *arc;
      unsigned ident;
    } cycle; /* Used in all-blocks mode, after blocks are linked onto
	       lines.  */
  } u;

  /* Temporary chain for solving graph, and for chaining blocks on one
     line.  */
  struct block_info *chain;

} block_t;

/* Describes a single function. Contains an array of basic blocks.  */

typedef struct function_info
{
  /* Name of function.  */
  char *name;
  char *demangled_name;
  unsigned ident;
  unsigned lineno_checksum;
  unsigned cfg_checksum;

  /* The graph contains at least one fake incoming edge.  */
  unsigned has_catch : 1;

  /* Array of basic blocks.  Like in GCC, the entry block is
     at blocks[0] and the exit block is at blocks[1].  */
#define ENTRY_BLOCK (0)
#define EXIT_BLOCK (1)
  block_t *blocks;
  unsigned num_blocks;
  unsigned blocks_executed;

  /* Raw arc coverage counts.  */
  gcov_type *counts;
  unsigned num_counts;

  /* First line number & file.  */
  unsigned line;
  unsigned src;

  /* Next function in same source file.  */
  struct function_info *line_next;

  /* Next function.  */
  struct function_info *next;
} function_t;

/* Describes coverage of a file or function.  */

typedef struct coverage_info
{
  int lines;
  int lines_executed;

  int branches;
  int branches_executed;
  int branches_taken;

  int calls;
  int calls_executed;

  char *name;
} coverage_t;

/* Describes a single line of source. Contains a chain of basic blocks
   with code on it.  */

typedef struct line_info
{
  gcov_type count;	   /* execution count */
  union
  {
    arc_t *branches;	   /* branches from blocks that end on this
			      line. Used for branch-counts when not
			      all-blocks mode.  */
    block_t *blocks;       /* blocks which start on this line.  Used
			      in all-blocks mode.  */
  } u;
  unsigned exists : 1;
  unsigned unexceptional : 1;
} line_t;

/* Describes a file mentioned in the block graph.  Contains an array
   of line info.  */

typedef struct source_info
{
  /* Canonical name of source file.  */
  char *name;
  time_t file_time;

  /* Array of line information.  */
  line_t *lines;
  unsigned num_lines;

  coverage_t coverage;

  /* Functions in this source file.  These are in ascending line
     number order.  */
  function_t *functions;
} source_t;

typedef struct name_map
{
  char *name;  /* Source file name */
  unsigned src;  /* Source file */
} name_map_t;

/* Holds a list of function basic block graphs.  */

static function_t *functions;
static function_t **fn_end = &functions;

static source_t *sources;   /* Array of source files  */
static unsigned n_sources;  /* Number of sources */
static unsigned a_sources;  /* Allocated sources */

static name_map_t *names;   /* Mapping of file names to sources */
static unsigned n_names;    /* Number of names */
static unsigned a_names;    /* Allocated names */

/* This holds data summary information.  */

static unsigned object_runs;
static unsigned program_count;

static unsigned total_lines;
static unsigned total_executed;

/* Modification time of graph file.  */

static time_t bbg_file_time;

/* Name of the notes (gcno) output file.  The "bbg" prefix is for
   historical reasons, when the notes file contained only the
   basic block graph notes.  */

static char *bbg_file_name;

/* Stamp of the bbg file */
static unsigned bbg_stamp;

/* Name and file pointer of the input file for the count data (gcda).  */

static char *da_file_name;

/* Data file is missing.  */

static int no_data_file;

/* If there is several input files, compute and display results after
   reading all data files.  This way if two or more gcda file refer to
   the same source file (eg inline subprograms in a .h file), the
   counts are added.  */

static int multiple_files = 0;

/* Output branch probabilities.  */

static int flag_branches = 0;

/* Show unconditional branches too.  */
static int flag_unconditional = 0;

/* Output a gcov file if this is true.  This is on by default, and can
   be turned off by the -n option.  */

static int flag_gcov_file = 1;

/* Output progress indication if this is true.  This is off by default
   and can be turned on by the -d option.  */

static int flag_display_progress = 0;

/* Output *.gcov file in intermediate format used by 'lcov'.  */

static int flag_intermediate_format = 0;

/* Output demangled function names.  */

static int flag_demangled_names = 0;

/* For included files, make the gcov output file name include the name
   of the input source file.  For example, if x.h is included in a.c,
   then the output file name is a.c##x.h.gcov instead of x.h.gcov.  */

static int flag_long_names = 0;

/* Output count information for every basic block, not merely those
   that contain line number information.  */

static int flag_all_blocks = 0;

/* Output summary info for each function.  */

static int flag_function_summary = 0;

/* Object directory file prefix.  This is the directory/file where the
   graph and data files are looked for, if nonzero.  */

static char *object_directory = 0;

/* Source directory prefix.  This is removed from source pathnames
   that match, when generating the output file name.  */

static char *source_prefix = 0;
static size_t source_length = 0;

/* Only show data for sources with relative pathnames.  Absolute ones
   usually indicate a system header file, which although it may
   contain inline functions, is usually uninteresting.  */
static int flag_relative_only = 0;

/* Preserve all pathname components. Needed when object files and
   source files are in subdirectories. '/' is mangled as '#', '.' is
   elided and '..' mangled to '^'.  */

static int flag_preserve_paths = 0;

/* Output the number of times a branch was taken as opposed to the percentage
   of times it was taken.  */

static int flag_counts = 0;

/* Forward declarations.  */
static int process_args (int, char **);
static void print_usage (int) ATTRIBUTE_NORETURN;
static void print_version (void) ATTRIBUTE_NORETURN;
static void process_file (const char *);
static void generate_results (const char *);
static void create_file_names (const char *);
static int name_search (const void *, const void *);
static int name_sort (const void *, const void *);
static char *canonicalize_name (const char *);
static unsigned find_source (const char *);
static function_t *read_graph_file (void);
static int read_count_file (function_t *);
static void solve_flow_graph (function_t *);
static void find_exception_blocks (function_t *);
static void add_branch_counts (coverage_t *, const arc_t *);
static void add_line_counts (coverage_t *, function_t *);
static void executed_summary (unsigned, unsigned);
static void function_summary (const coverage_t *, const char *);
static const char *format_gcov (gcov_type, gcov_type, int);
static void accumulate_line_counts (source_t *);
static void output_gcov_file (const char *, source_t *);
static int output_branch_count (FILE *, int, const arc_t *);
static void output_lines (FILE *, const source_t *);
static char *make_gcov_file_name (const char *, const char *);
static char *mangle_name (const char *, char *);
static void release_structures (void);
static void release_function (function_t *);
extern int main (int, char **);

int
main (int argc, char **argv)
{
  int argno;
  int first_arg;
  const char *p;

  p = argv[0] + strlen (argv[0]);
  while (p != argv[0] && !IS_DIR_SEPARATOR (p[-1]))
    --p;
  progname = p;

  xmalloc_set_program_name (progname);

  /* Unlock the stdio streams.  */
  unlock_std_streams ();

  gcc_init_libintl ();

  diagnostic_initialize (global_dc, 0);

  /* Handle response files.  */
  expandargv (&argc, &argv);

  a_names = 10;
  names = XNEWVEC (name_map_t, a_names);
  a_sources = 10;
  sources = XNEWVEC (source_t, a_sources);
  
  argno = process_args (argc, argv);
  if (optind == argc)
    print_usage (true);

  if (argc - argno > 1)
    multiple_files = 1;

  first_arg = argno;
  
  for (; argno != argc; argno++)
    {
      if (flag_display_progress)
        printf ("Processing file %d out of %d\n",
		argno - first_arg + 1, argc - first_arg);
      process_file (argv[argno]);
    }

  generate_results (multiple_files ? NULL : argv[argc - 1]);

  release_structures ();

  return 0;
}

/* Print a usage message and exit.  If ERROR_P is nonzero, this is an error,
   otherwise the output of --help.  */

static void
print_usage (int error_p)
{
  FILE *file = error_p ? stderr : stdout;
  int status = error_p ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE;

  fnotice (file, "Usage: gcov [OPTION]... SOURCE|OBJ...\n\n");
  fnotice (file, "Print code coverage information.\n\n");
  fnotice (file, "  -h, --help                      Print this help, then exit\n");
  fnotice (file, "  -a, --all-blocks                Show information for every basic block\n");
  fnotice (file, "  -b, --branch-probabilities      Include branch probabilities in output\n");
  fnotice (file, "  -c, --branch-counts             Output counts of branches taken\n\
                                    rather than percentages\n");
  fnotice (file, "  -d, --display-progress          Display progress information\n");
  fnotice (file, "  -f, --function-summaries        Output summaries for each function\n");
  fnotice (file, "  -i, --intermediate-format       Output .gcov file in intermediate text format\n");
  fnotice (file, "  -l, --long-file-names           Use long output file names for included\n\
                                    source files\n");
  fnotice (file, "  -m, --demangled-names           Output demangled function names\n");
  fnotice (file, "  -n, --no-output                 Do not create an output file\n");
  fnotice (file, "  -o, --object-directory DIR|FILE Search for object files in DIR or called FILE\n");
  fnotice (file, "  -p, --preserve-paths            Preserve all pathname components\n");
  fnotice (file, "  -r, --relative-only             Only show data for relative sources\n");
  fnotice (file, "  -s, --source-prefix DIR         Source prefix to elide\n");
  fnotice (file, "  -u, --unconditional-branches    Show unconditional branch counts too\n");
  fnotice (file, "  -v, --version                   Print version number, then exit\n");
  fnotice (file, "\nFor bug reporting instructions, please see:\n%s.\n",
	   bug_report_url);
  exit (status);
}

/* Print version information and exit.  */

static void
print_version (void)
{
  fnotice (stdout, "gcov %s%s\n", pkgversion_string, version_string);
  fprintf (stdout, "Copyright %s 2014 Free Software Foundation, Inc.\n",
	   _("(C)"));
  fnotice (stdout,
	   _("This is free software; see the source for copying conditions.\n"
	     "There is NO warranty; not even for MERCHANTABILITY or \n"
	     "FITNESS FOR A PARTICULAR PURPOSE.\n\n"));
  exit (SUCCESS_EXIT_CODE);
}

static const struct option options[] =
{
  { "help",                 no_argument,       NULL, 'h' },
  { "version",              no_argument,       NULL, 'v' },
  { "all-blocks",           no_argument,       NULL, 'a' },
  { "branch-probabilities", no_argument,       NULL, 'b' },
  { "branch-counts",        no_argument,       NULL, 'c' },
  { "intermediate-format",  no_argument,       NULL, 'i' },
  { "no-output",            no_argument,       NULL, 'n' },
  { "long-file-names",      no_argument,       NULL, 'l' },
  { "function-summaries",   no_argument,       NULL, 'f' },
  { "demangled-names",      no_argument,       NULL, 'm' },
  { "preserve-paths",       no_argument,       NULL, 'p' },
  { "relative-only",        no_argument,       NULL, 'r' },
  { "object-directory",     required_argument, NULL, 'o' },
  { "object-file",          required_argument, NULL, 'o' },
  { "source-prefix",        required_argument, NULL, 's' },
  { "unconditional-branches", no_argument,     NULL, 'u' },
  { "display-progress",     no_argument,       NULL, 'd' },
  { 0, 0, 0, 0 }
};

/* Process args, return index to first non-arg.  */

static int
process_args (int argc, char **argv)
{
  int opt;

  while ((opt = getopt_long (argc, argv, "abcdfhilmno:s:pruv", options, NULL)) !=
         -1)
    {
      switch (opt)
	{
	case 'a':
	  flag_all_blocks = 1;
	  break;
	case 'b':
	  flag_branches = 1;
	  break;
	case 'c':
	  flag_counts = 1;
	  break;
	case 'f':
	  flag_function_summary = 1;
	  break;
	case 'h':
	  print_usage (false);
	  /* print_usage will exit.  */
	case 'l':
	  flag_long_names = 1;
	  break;
	case 'm':
	  flag_demangled_names = 1;
	  break;
	case 'n':
	  flag_gcov_file = 0;
	  break;
	case 'o':
	  object_directory = optarg;
	  break;
	case 's':
	  source_prefix = optarg;
	  source_length = strlen (source_prefix);
	  break;
	case 'r':
	  flag_relative_only = 1;
	  break;
	case 'p':
	  flag_preserve_paths = 1;
	  break;
	case 'u':
	  flag_unconditional = 1;
	  break;
	case 'i':
          flag_intermediate_format = 1;
          flag_gcov_file = 1;
          break;
        case 'd':
          flag_display_progress = 1;
          break;
	case 'v':
	  print_version ();
	  /* print_version will exit.  */
	default:
	  print_usage (true);
	  /* print_usage will exit.  */
	}
    }

  return optind;
}

/* Get the name of the gcov file.  The return value must be free'd.

   It appends the '.gcov' extension to the *basename* of the file.
   The resulting file name will be in PWD.

   e.g.,
   input: foo.da,       output: foo.da.gcov
   input: a/b/foo.cc,   output: foo.cc.gcov  */

static char *
get_gcov_intermediate_filename (const char *file_name)
{
  const char *gcov = ".gcov";
  char *result;
  const char *cptr;

  /* Find the 'basename'.  */
  cptr = lbasename (file_name);

  result = XNEWVEC (char, strlen (cptr) + strlen (gcov) + 1);
  sprintf (result, "%s%s", cptr, gcov);

  return result;
}

/* Output the result in intermediate format used by 'lcov'.

The intermediate format contains a single file named 'foo.cc.gcov',
with no source code included. A sample output is

file:foo.cc
function:5,1,_Z3foov
function:13,1,main
function:19,1,_GLOBAL__sub_I__Z3foov
function:19,1,_Z41__static_initialization_and_destruction_0ii
lcount:5,1
lcount:7,9
lcount:9,8
lcount:11,1
file:/.../iostream
lcount:74,1
file:/.../basic_ios.h
file:/.../ostream
file:/.../ios_base.h
function:157,0,_ZStorSt12_Ios_IostateS_
lcount:157,0
file:/.../char_traits.h
function:258,0,_ZNSt11char_traitsIcE6lengthEPKc
lcount:258,0
...

The default gcov outputs multiple files: 'foo.cc.gcov',
'iostream.gcov', 'ios_base.h.gcov', etc. with source code
included. Instead the intermediate format here outputs only a single
file 'foo.cc.gcov' similar to the above example. */

static void
output_intermediate_file (FILE *gcov_file, source_t *src)
{
  unsigned line_num;    /* current line number.  */
  const line_t *line;   /* current line info ptr.  */
  function_t *fn;       /* current function info ptr. */

  fprintf (gcov_file, "file:%s\n", src->name);    /* source file name */

  for (fn = src->functions; fn; fn = fn->line_next)
    {
      /* function:<name>,<line_number>,<execution_count> */
      fprintf (gcov_file, "function:%d,%s,%s\n", fn->line,
               format_gcov (fn->blocks[0].count, 0, -1),
               flag_demangled_names ? fn->demangled_name : fn->name);
    }

  for (line_num = 1, line = &src->lines[line_num];
       line_num < src->num_lines;
       line_num++, line++)
    {
      arc_t *arc;
      if (line->exists)
        fprintf (gcov_file, "lcount:%u,%s\n", line_num,
                 format_gcov (line->count, 0, -1));
      if (flag_branches)
        for (arc = line->u.branches; arc; arc = arc->line_next)
          {
            if (!arc->is_unconditional && !arc->is_call_non_return)
              {
                const char *branch_type;
                /* branch:<line_num>,<branch_coverage_type>
                   branch_coverage_type
                     : notexec (Branch not executed)
                     : taken (Branch executed and taken)
                     : nottaken (Branch executed, but not taken)
                */
                if (arc->src->count)
                  branch_type = (arc->count > 0) ? "taken" : "nottaken";
                else
                  branch_type = "notexec";
                fprintf (gcov_file, "branch:%d,%s\n", line_num, branch_type);
              }
          }
    }
}


/* Process a single input file.  */

static void
process_file (const char *file_name)
{
  function_t *fns;

  create_file_names (file_name);
  fns = read_graph_file ();
  if (!fns)
    return;
  
  read_count_file (fns);
  while (fns)
    {
      function_t *fn = fns;

      fns = fn->next;
      fn->next = NULL;
      if (fn->counts)
	{
	  unsigned src = fn->src;
	  unsigned line = fn->line;
	  unsigned block_no;
	  function_t *probe, **prev;
	  
	  /* Now insert it into the source file's list of
	     functions. Normally functions will be encountered in
	     ascending order, so a simple scan is quick.  Note we're
	     building this list in reverse order.  */
	  for (prev = &sources[src].functions;
	       (probe = *prev); prev = &probe->line_next)
	    if (probe->line <= line)
	      break;
	  fn->line_next = probe;
	  *prev = fn;

	  /* Mark last line in files touched by function.  */
	  for (block_no = 0; block_no != fn->num_blocks; block_no++)
	    {
	      unsigned *enc = fn->blocks[block_no].u.line.encoding;
	      unsigned num = fn->blocks[block_no].u.line.num;

	      for (; num--; enc++)
		if (!*enc)
		  {
		    if (enc[1] != src)
		      {
			if (line >= sources[src].num_lines)
			  sources[src].num_lines = line + 1;
			line = 0;
			src = enc[1];
		      }
		    enc++;
		    num--;
		  }
		else if (*enc > line)
		  line = *enc;
	    }
	  if (line >= sources[src].num_lines)
	    sources[src].num_lines = line + 1;
	  
	  solve_flow_graph (fn);
	  if (fn->has_catch)
	    find_exception_blocks (fn);
	  *fn_end = fn;
	  fn_end = &fn->next;
	}
      else
	/* The function was not in the executable -- some other
	   instance must have been selected.  */
	release_function (fn);
    }
}

static void
output_gcov_file (const char *file_name, source_t *src)
{
  char *gcov_file_name = make_gcov_file_name (file_name, src->coverage.name);

  if (src->coverage.lines)
    {
      FILE *gcov_file = fopen (gcov_file_name, "w");
      if (gcov_file)
        {
          fnotice (stdout, "Creating '%s'\n", gcov_file_name);
          output_lines (gcov_file, src);
          if (ferror (gcov_file))
            fnotice (stderr, "Error writing output file '%s'\n", gcov_file_name);
          fclose (gcov_file);
        }
      else
        fnotice (stderr, "Could not open output file '%s'\n", gcov_file_name);
    }
  else
    {
      unlink (gcov_file_name);
      fnotice (stdout, "Removing '%s'\n", gcov_file_name);
    }
  free (gcov_file_name);
}

static void
generate_results (const char *file_name)
{
  unsigned ix;
  source_t *src;
  function_t *fn;
  FILE *gcov_intermediate_file = NULL;
  char *gcov_intermediate_filename = NULL;

  for (ix = n_sources, src = sources; ix--; src++)
    if (src->num_lines)
      src->lines = XCNEWVEC (line_t, src->num_lines);

  for (fn = functions; fn; fn = fn->next)
    {
      coverage_t coverage;

      memset (&coverage, 0, sizeof (coverage));
      coverage.name = flag_demangled_names ? fn->demangled_name : fn->name;
      add_line_counts (flag_function_summary ? &coverage : NULL, fn);
      if (flag_function_summary)
	{
	  function_summary (&coverage, "Function");
	  fnotice (stdout, "\n");
	}
    }

  if (file_name)
    {
      name_map_t *name_map = (name_map_t *)bsearch
	(file_name, names, n_names, sizeof (*names), name_search);
      if (name_map)
	file_name = sources[name_map->src].coverage.name;
      else
	file_name = canonicalize_name (file_name);
    }

  if (flag_gcov_file && flag_intermediate_format)
    {
      /* Open the intermediate file.  */
      gcov_intermediate_filename =
        get_gcov_intermediate_filename (file_name);
      gcov_intermediate_file = fopen (gcov_intermediate_filename, "w");
      if (!gcov_intermediate_file)
        {
          fnotice (stderr, "Cannot open intermediate output file %s\n",
                   gcov_intermediate_filename);
          return;
        }
    }

  for (ix = n_sources, src = sources; ix--; src++)
    {
      if (flag_relative_only)
	{
	  /* Ignore this source, if it is an absolute path (after
	     source prefix removal).  */
	  char first = src->coverage.name[0];
      
#if HAVE_DOS_BASED_FILE_SYSTEM
	  if (first && src->coverage.name[1] == ':')
	    first = src->coverage.name[2];
#endif
	  if (IS_DIR_SEPARATOR (first))
	    continue;
	}
      
      accumulate_line_counts (src);
      function_summary (&src->coverage, "File");
      total_lines += src->coverage.lines;
      total_executed += src->coverage.lines_executed;
      if (flag_gcov_file)
	{
          if (flag_intermediate_format)
            /* Output the intermediate format without requiring source
               files.  This outputs a section to a *single* file.  */
            output_intermediate_file (gcov_intermediate_file, src);
          else
            output_gcov_file (file_name, src);
          fnotice (stdout, "\n");
        }
    }

  if (flag_gcov_file && flag_intermediate_format)
    {
      /* Now we've finished writing the intermediate file.  */
      fclose (gcov_intermediate_file);
      XDELETEVEC (gcov_intermediate_filename);
    }

  if (!file_name)
    executed_summary (total_lines, total_executed);
}

/* Release a function structure */

static void
release_function (function_t *fn)
{
  unsigned ix;
  block_t *block;

  for (ix = fn->num_blocks, block = fn->blocks; ix--; block++)
    {
      arc_t *arc, *arc_n;

      for (arc = block->succ; arc; arc = arc_n)
	{
	  arc_n = arc->succ_next;
	  free (arc);
	}
    }
  free (fn->blocks);
  free (fn->counts);
  if (flag_demangled_names && fn->demangled_name != fn->name)
    free (fn->demangled_name);
  free (fn->name);
}

/* Release all memory used.  */

static void
release_structures (void)
{
  unsigned ix;
  function_t *fn;

  for (ix = n_sources; ix--;)
    free (sources[ix].lines);
  free (sources);
  
  for (ix = n_names; ix--;)
    free (names[ix].name);
  free (names);

  while ((fn = functions))
    {
      functions = fn->next;
      release_function (fn);
    }
}

/* Generate the names of the graph and data files.  If OBJECT_DIRECTORY
   is not specified, these are named from FILE_NAME sans extension.  If
   OBJECT_DIRECTORY is specified and is a directory, the files are in that
   directory, but named from the basename of the FILE_NAME, sans extension.
   Otherwise OBJECT_DIRECTORY is taken to be the name of the object *file*
   and the data files are named from that.  */

static void
create_file_names (const char *file_name)
{
  char *cptr;
  char *name;
  int length = strlen (file_name);
  int base;

  /* Free previous file names.  */
  free (bbg_file_name);
  free (da_file_name);
  da_file_name = bbg_file_name = NULL;
  bbg_file_time = 0;
  bbg_stamp = 0;

  if (object_directory && object_directory[0])
    {
      struct stat status;

      length += strlen (object_directory) + 2;
      name = XNEWVEC (char, length);
      name[0] = 0;

      base = !stat (object_directory, &status) && S_ISDIR (status.st_mode);
      strcat (name, object_directory);
      if (base && (! IS_DIR_SEPARATOR (name[strlen (name) - 1])))
	strcat (name, "/");
    }
  else
    {
      name = XNEWVEC (char, length + 1);
      strcpy (name, file_name);
      base = 0;
    }

  if (base)
    {
      /* Append source file name.  */
      const char *cptr = lbasename (file_name);
      strcat (name, cptr ? cptr : file_name);
    }

  /* Remove the extension.  */
  cptr = strrchr (CONST_CAST (char *, lbasename (name)), '.');
  if (cptr)
    *cptr = 0;

  length = strlen (name);

  bbg_file_name = XNEWVEC (char, length + strlen (GCOV_NOTE_SUFFIX) + 1);
  strcpy (bbg_file_name, name);
  strcpy (bbg_file_name + length, GCOV_NOTE_SUFFIX);

  da_file_name = XNEWVEC (char, length + strlen (GCOV_DATA_SUFFIX) + 1);
  strcpy (da_file_name, name);
  strcpy (da_file_name + length, GCOV_DATA_SUFFIX);

  free (name);
  return;
}

/* A is a string and B is a pointer to name_map_t.  Compare for file
   name orderability.  */

static int
name_search (const void *a_, const void *b_)
{
  const char *a = (const char *)a_;
  const name_map_t *b = (const name_map_t *)b_;

#if HAVE_DOS_BASED_FILE_SYSTEM
  return strcasecmp (a, b->name);
#else
  return strcmp (a, b->name);
#endif
}

/* A and B are a pointer to name_map_t.  Compare for file name
   orderability.  */

static int
name_sort (const void *a_, const void *b_)
{
  const name_map_t *a = (const name_map_t *)a_;
  return name_search (a->name, b_);
}

/* Find or create a source file structure for FILE_NAME. Copies
   FILE_NAME on creation */

static unsigned
find_source (const char *file_name)
{
  name_map_t *name_map;
  char *canon;
  unsigned idx;
  struct stat status;

  if (!file_name)
    file_name = "<unknown>";
  name_map = (name_map_t *)bsearch
    (file_name, names, n_names, sizeof (*names), name_search);
  if (name_map)
    {
      idx = name_map->src;
      goto check_date;
    }

  if (n_names + 2 > a_names)
    {
      /* Extend the name map array -- we'll be inserting one or two
	 entries.  */
      a_names *= 2;
      name_map = XNEWVEC (name_map_t, a_names);
      memcpy (name_map, names, n_names * sizeof (*names));
      free (names);
      names = name_map;
    }
  
  /* Not found, try the canonical name. */
  canon = canonicalize_name (file_name);
  name_map = (name_map_t *)bsearch
    (canon, names, n_names, sizeof (*names), name_search);
  if (!name_map)
    {
      /* Not found with canonical name, create a new source.  */
      source_t *src;
      
      if (n_sources == a_sources)
	{
	  a_sources *= 2;
	  src = XNEWVEC (source_t, a_sources);
	  memcpy (src, sources, n_sources * sizeof (*sources));
	  free (sources);
	  sources = src;
	}

      idx = n_sources;

      name_map = &names[n_names++];
      name_map->name = canon;
      name_map->src = idx;

      src = &sources[n_sources++];
      memset (src, 0, sizeof (*src));
      src->name = canon;
      src->coverage.name = src->name;
      if (source_length
#if HAVE_DOS_BASED_FILE_SYSTEM
	  /* You lose if separators don't match exactly in the
	     prefix.  */
	  && !strncasecmp (source_prefix, src->coverage.name, source_length)
#else
	  && !strncmp (source_prefix, src->coverage.name, source_length)
#endif
	  && IS_DIR_SEPARATOR (src->coverage.name[source_length]))
	src->coverage.name += source_length + 1;
      if (!stat (src->name, &status))
	src->file_time = status.st_mtime;
    }
  else
    idx = name_map->src;

  if (name_search (file_name, name_map))
    {
      /* Append the non-canonical name.  */
      name_map = &names[n_names++];
      name_map->name = xstrdup (file_name);
      name_map->src = idx;
    }

  /* Resort the name map.  */
  qsort (names, n_names, sizeof (*names), name_sort);
  
 check_date:
  if (sources[idx].file_time > bbg_file_time)
    {
      static int info_emitted;

      fnotice (stderr, "%s:source file is newer than notes file '%s'\n",
	       file_name, bbg_file_name);
      if (!info_emitted)
	{
	  fnotice (stderr,
		   "(the message is only displayed one per source file)\n");
	  info_emitted = 1;
	}
      sources[idx].file_time = 0;
    }

  return idx;
}

/* Read the notes file.  Return list of functions read -- in reverse order.  */

static function_t *
read_graph_file (void)
{
  unsigned version;
  unsigned current_tag = 0;
  function_t *fn = NULL;
  function_t *fns = NULL;
  function_t **fns_end = &fns;
  unsigned src_idx = 0;
  unsigned ix;
  unsigned tag;

  if (!gcov_open (bbg_file_name, 1))
    {
      fnotice (stderr, "%s:cannot open notes file\n", bbg_file_name);
      return fns;
    }
  bbg_file_time = gcov_time ();
  if (!gcov_magic (gcov_read_unsigned (), GCOV_NOTE_MAGIC))
    {
      fnotice (stderr, "%s:not a gcov notes file\n", bbg_file_name);
      gcov_close ();
      return fns;
    }

  version = gcov_read_unsigned ();
  if (version != GCOV_VERSION)
    {
      char v[4], e[4];

      GCOV_UNSIGNED2STRING (v, version);
      GCOV_UNSIGNED2STRING (e, GCOV_VERSION);

      fnotice (stderr, "%s:version '%.4s', prefer '%.4s'\n",
	       bbg_file_name, v, e);
    }
  bbg_stamp = gcov_read_unsigned ();

  while ((tag = gcov_read_unsigned ()))
    {
      unsigned length = gcov_read_unsigned ();
      gcov_position_t base = gcov_position ();

      if (tag == GCOV_TAG_FUNCTION)
	{
	  char *function_name;
	  unsigned ident, lineno;
	  unsigned lineno_checksum, cfg_checksum;

	  ident = gcov_read_unsigned ();
	  lineno_checksum = gcov_read_unsigned ();
	  cfg_checksum = gcov_read_unsigned ();
	  function_name = xstrdup (gcov_read_string ());
	  src_idx = find_source (gcov_read_string ());
	  lineno = gcov_read_unsigned ();

	  fn = XCNEW (function_t);
	  fn->name = function_name;
          if (flag_demangled_names)
            {
              fn->demangled_name = cplus_demangle (fn->name, DMGL_PARAMS);
              if (!fn->demangled_name)
                fn->demangled_name = fn->name;
            }
	  fn->ident = ident;
	  fn->lineno_checksum = lineno_checksum;
	  fn->cfg_checksum = cfg_checksum;
	  fn->src = src_idx;
	  fn->line = lineno;

	  fn->line_next = NULL;
	  fn->next = NULL;
	  *fns_end = fn;
	  fns_end = &fn->next;
	  current_tag = tag;

	}
      else if (fn && tag == GCOV_TAG_BLOCKS)
	{
	  if (fn->blocks)
	    fnotice (stderr, "%s:already seen blocks for '%s'\n",
		     bbg_file_name, fn->name);
	  else
	    {
	      unsigned ix, num_blocks = GCOV_TAG_BLOCKS_NUM (length);
	      fn->num_blocks = num_blocks;

	      fn->blocks = XCNEWVEC (block_t, fn->num_blocks);
	      for (ix = 0; ix != num_blocks; ix++)
		fn->blocks[ix].flags = gcov_read_unsigned ();
	    }
	}
      else if (fn && tag == GCOV_TAG_ARCS)
	{
	  unsigned src = gcov_read_unsigned ();
	  unsigned num_dests = GCOV_TAG_ARCS_NUM (length);
	  block_t *src_blk = &fn->blocks[src];
	  unsigned mark_catches = 0;
	  struct arc_info *arc;

	  if (src >= fn->num_blocks || fn->blocks[src].succ)
	    goto corrupt;

	  while (num_dests--)
	    {
	      unsigned dest = gcov_read_unsigned ();
	      unsigned flags = gcov_read_unsigned ();

	      if (dest >= fn->num_blocks)
		goto corrupt;
	      arc = XCNEW (arc_t);

	      arc->dst = &fn->blocks[dest];
	      arc->src = src_blk;

	      arc->count = 0;
	      arc->count_valid = 0;
	      arc->on_tree = !!(flags & GCOV_ARC_ON_TREE);
	      arc->fake = !!(flags & GCOV_ARC_FAKE);
	      arc->fall_through = !!(flags & GCOV_ARC_FALLTHROUGH);

	      arc->succ_next = src_blk->succ;
	      src_blk->succ = arc;
	      src_blk->num_succ++;

	      arc->pred_next = fn->blocks[dest].pred;
	      fn->blocks[dest].pred = arc;
	      fn->blocks[dest].num_pred++;

	      if (arc->fake)
		{
		  if (src)
		    {
		      /* Exceptional exit from this function, the
			 source block must be a call.  */
		      fn->blocks[src].is_call_site = 1;
		      arc->is_call_non_return = 1;
		      mark_catches = 1;
		    }
		  else
		    {
		      /* Non-local return from a callee of this
		         function. The destination block is a setjmp.  */
		      arc->is_nonlocal_return = 1;
		      fn->blocks[dest].is_nonlocal_return = 1;
		    }
		}

	      if (!arc->on_tree)
		fn->num_counts++;
	    }
	  
	  if (mark_catches)
	    {
	      /* We have a fake exit from this block.  The other
		 non-fall through exits must be to catch handlers.
		 Mark them as catch arcs.  */

	      for (arc = src_blk->succ; arc; arc = arc->succ_next)
		if (!arc->fake && !arc->fall_through)
		  {
		    arc->is_throw = 1;
		    fn->has_catch = 1;
		  }
	    }
	}
      else if (fn && tag == GCOV_TAG_LINES)
	{
	  unsigned blockno = gcov_read_unsigned ();
	  unsigned *line_nos = XCNEWVEC (unsigned, length - 1);

	  if (blockno >= fn->num_blocks || fn->blocks[blockno].u.line.encoding)
	    goto corrupt;

	  for (ix = 0; ;  )
	    {
	      unsigned lineno = gcov_read_unsigned ();

	      if (lineno)
		{
		  if (!ix)
		    {
		      line_nos[ix++] = 0;
		      line_nos[ix++] = src_idx;
		    }
		  line_nos[ix++] = lineno;

		}
	      else
		{
		  const char *file_name = gcov_read_string ();

		  if (!file_name)
		    break;
		  src_idx = find_source (file_name);
		  line_nos[ix++] = 0;
		  line_nos[ix++] = src_idx;
		}
	    }

	  fn->blocks[blockno].u.line.encoding = line_nos;
	  fn->blocks[blockno].u.line.num = ix;
	}
      else if (current_tag && !GCOV_TAG_IS_SUBTAG (current_tag, tag))
	{
	  fn = NULL;
	  current_tag = 0;
	}
      gcov_sync (base, length);
      if (gcov_is_error ())
	{
	corrupt:;
	  fnotice (stderr, "%s:corrupted\n", bbg_file_name);
	  break;
	}
    }
  gcov_close ();

  if (!fns)
    fnotice (stderr, "%s:no functions found\n", bbg_file_name);

  return fns;
}

/* Reads profiles from the count file and attach to each
   function. Return nonzero if fatal error.  */

static int
read_count_file (function_t *fns)
{
  unsigned ix;
  unsigned version;
  unsigned tag;
  function_t *fn = NULL;
  int error = 0;

  if (!gcov_open (da_file_name, 1))
    {
      fnotice (stderr, "%s:cannot open data file, assuming not executed\n",
	       da_file_name);
      no_data_file = 1;
      return 0;
    }
  if (!gcov_magic (gcov_read_unsigned (), GCOV_DATA_MAGIC))
    {
      fnotice (stderr, "%s:not a gcov data file\n", da_file_name);
    cleanup:;
      gcov_close ();
      return 1;
    }
  version = gcov_read_unsigned ();
  if (version != GCOV_VERSION)
    {
      char v[4], e[4];

      GCOV_UNSIGNED2STRING (v, version);
      GCOV_UNSIGNED2STRING (e, GCOV_VERSION);

      fnotice (stderr, "%s:version '%.4s', prefer version '%.4s'\n",
	       da_file_name, v, e);
    }
  tag = gcov_read_unsigned ();
  if (tag != bbg_stamp)
    {
      fnotice (stderr, "%s:stamp mismatch with notes file\n", da_file_name);
      goto cleanup;
    }

  while ((tag = gcov_read_unsigned ()))
    {
      unsigned length = gcov_read_unsigned ();
      unsigned long base = gcov_position ();

      if (tag == GCOV_TAG_PROGRAM_SUMMARY)
	{
	  struct gcov_summary summary;
	  gcov_read_summary (&summary);
	  object_runs += summary.ctrs[GCOV_COUNTER_ARCS].runs;
	  program_count++;
	}
      else if (tag == GCOV_TAG_BUILD_INFO)
        {
          gcov_unsigned_t num_strings;
          char **build_info_strings = gcov_read_build_info (length,
                                                            &num_strings);
          for (unsigned i = 0; i < num_strings; i++)
            free (build_info_strings[i]);
          free (build_info_strings);
        }
      else if (tag == GCOV_TAG_COMDAT_ZERO_FIXUP)
        {
          gcov_unsigned_t num_fn;
          int *zero_fixup_flags = gcov_read_comdat_zero_fixup (length, &num_fn);
          free (zero_fixup_flags);
        }
      else if (tag == GCOV_TAG_FUNCTION && !length)
	; /* placeholder  */
      else if (tag == GCOV_TAG_FUNCTION && length == GCOV_TAG_FUNCTION_LENGTH)
	{
	  unsigned ident;
	  struct function_info *fn_n;

	  /* Try to find the function in the list.  To speed up the
	     search, first start from the last function found.  */
	  ident = gcov_read_unsigned ();
	  fn_n = fns;
	  for (fn = fn ? fn->next : NULL; ; fn = fn->next)
	    {
	      if (fn)
		;
	      else if ((fn = fn_n))
		fn_n = NULL;
	      else
		{
		  fnotice (stderr, "%s:unknown function '%u'\n",
			   da_file_name, ident);
		  break;
		}
	      if (fn->ident == ident)
		break;
	    }

	  if (!fn)
	    ;
	  else if (gcov_read_unsigned () != fn->lineno_checksum
		   || gcov_read_unsigned () != fn->cfg_checksum)
	    {
	    mismatch:;
	      fnotice (stderr, "%s:profile mismatch for '%s'\n",
		       da_file_name, fn->name);
	      goto cleanup;
	    }
	}
      else if (tag == GCOV_TAG_FOR_COUNTER (GCOV_COUNTER_ARCS) && fn)
	{
	  if (length != GCOV_TAG_COUNTER_LENGTH (fn->num_counts))
	    goto mismatch;

	  if (!fn->counts)
	    fn->counts = XCNEWVEC (gcov_type, fn->num_counts);

	  for (ix = 0; ix != fn->num_counts; ix++)
	    fn->counts[ix] += gcov_read_counter ();
	}
      gcov_sync (base, length);
      if ((error = gcov_is_error ()))
	{
	  fnotice (stderr, error < 0 ? "%s:overflowed\n" : "%s:corrupted\n",
		   da_file_name);
	  goto cleanup;
	}
    }

  gcov_close ();
  return 0;
}

/* Solve the flow graph. Propagate counts from the instrumented arcs
   to the blocks and the uninstrumented arcs.  */

static void
solve_flow_graph (function_t *fn)
{
  unsigned ix;
  arc_t *arc;
  gcov_type *count_ptr = fn->counts;
  block_t *blk;
  block_t *valid_blocks = NULL;    /* valid, but unpropagated blocks.  */
  block_t *invalid_blocks = NULL;  /* invalid, but inferable blocks.  */

  /* The arcs were built in reverse order.  Fix that now.  */
  for (ix = fn->num_blocks; ix--;)
    {
      arc_t *arc_p, *arc_n;

      for (arc_p = NULL, arc = fn->blocks[ix].succ; arc;
	   arc_p = arc, arc = arc_n)
	{
	  arc_n = arc->succ_next;
	  arc->succ_next = arc_p;
	}
      fn->blocks[ix].succ = arc_p;

      for (arc_p = NULL, arc = fn->blocks[ix].pred; arc;
	   arc_p = arc, arc = arc_n)
	{
	  arc_n = arc->pred_next;
	  arc->pred_next = arc_p;
	}
      fn->blocks[ix].pred = arc_p;
    }

  if (fn->num_blocks < 2)
    fnotice (stderr, "%s:'%s' lacks entry and/or exit blocks\n",
	     bbg_file_name, fn->name);
  else
    {
      if (fn->blocks[ENTRY_BLOCK].num_pred)
	fnotice (stderr, "%s:'%s' has arcs to entry block\n",
		 bbg_file_name, fn->name);
      else
	/* We can't deduce the entry block counts from the lack of
	   predecessors.  */
	fn->blocks[ENTRY_BLOCK].num_pred = ~(unsigned)0;

      if (fn->blocks[EXIT_BLOCK].num_succ)
	fnotice (stderr, "%s:'%s' has arcs from exit block\n",
		 bbg_file_name, fn->name);
      else
	/* Likewise, we can't deduce exit block counts from the lack
	   of its successors.  */
	fn->blocks[EXIT_BLOCK].num_succ = ~(unsigned)0;
    }

  /* Propagate the measured counts, this must be done in the same
     order as the code in profile.c  */
  for (ix = 0, blk = fn->blocks; ix != fn->num_blocks; ix++, blk++)
    {
      block_t const *prev_dst = NULL;
      int out_of_order = 0;
      int non_fake_succ = 0;

      for (arc = blk->succ; arc; arc = arc->succ_next)
	{
	  if (!arc->fake)
	    non_fake_succ++;

	  if (!arc->on_tree)
	    {
	      if (count_ptr)
		arc->count = *count_ptr++;
	      arc->count_valid = 1;
	      blk->num_succ--;
	      arc->dst->num_pred--;
	    }
	  if (prev_dst && prev_dst > arc->dst)
	    out_of_order = 1;
	  prev_dst = arc->dst;
	}
      if (non_fake_succ == 1)
	{
	  /* If there is only one non-fake exit, it is an
	     unconditional branch.  */
	  for (arc = blk->succ; arc; arc = arc->succ_next)
	    if (!arc->fake)
	      {
		arc->is_unconditional = 1;
		/* If this block is instrumenting a call, it might be
		   an artificial block. It is not artificial if it has
		   a non-fallthrough exit, or the destination of this
		   arc has more than one entry.  Mark the destination
		   block as a return site, if none of those conditions
		   hold.  */
		if (blk->is_call_site && arc->fall_through
		    && arc->dst->pred == arc && !arc->pred_next)
		  arc->dst->is_call_return = 1;
	      }
	}

      /* Sort the successor arcs into ascending dst order. profile.c
	 normally produces arcs in the right order, but sometimes with
	 one or two out of order.  We're not using a particularly
	 smart sort.  */
      if (out_of_order)
	{
	  arc_t *start = blk->succ;
	  unsigned changes = 1;

	  while (changes)
	    {
	      arc_t *arc, *arc_p, *arc_n;

	      changes = 0;
	      for (arc_p = NULL, arc = start; (arc_n = arc->succ_next);)
		{
		  if (arc->dst > arc_n->dst)
		    {
		      changes = 1;
		      if (arc_p)
			arc_p->succ_next = arc_n;
		      else
			start = arc_n;
		      arc->succ_next = arc_n->succ_next;
		      arc_n->succ_next = arc;
		      arc_p = arc_n;
		    }
		  else
		    {
		      arc_p = arc;
		      arc = arc_n;
		    }
		}
	    }
	  blk->succ = start;
	}

      /* Place it on the invalid chain, it will be ignored if that's
	 wrong.  */
      blk->invalid_chain = 1;
      blk->chain = invalid_blocks;
      invalid_blocks = blk;
    }

  while (invalid_blocks || valid_blocks)
    {
      while ((blk = invalid_blocks))
	{
	  gcov_type total = 0;
	  const arc_t *arc;

	  invalid_blocks = blk->chain;
	  blk->invalid_chain = 0;
	  if (!blk->num_succ)
	    for (arc = blk->succ; arc; arc = arc->succ_next)
	      total += arc->count;
	  else if (!blk->num_pred)
	    for (arc = blk->pred; arc; arc = arc->pred_next)
	      total += arc->count;
	  else
	    continue;

	  blk->count = total;
	  blk->count_valid = 1;
	  blk->chain = valid_blocks;
	  blk->valid_chain = 1;
	  valid_blocks = blk;
	}
      while ((blk = valid_blocks))
	{
	  gcov_type total;
	  arc_t *arc, *inv_arc;

	  valid_blocks = blk->chain;
	  blk->valid_chain = 0;
	  if (blk->num_succ == 1)
	    {
	      block_t *dst;

	      total = blk->count;
	      inv_arc = NULL;
	      for (arc = blk->succ; arc; arc = arc->succ_next)
		{
		  total -= arc->count;
		  if (!arc->count_valid)
		    inv_arc = arc;
		}
	      dst = inv_arc->dst;
	      inv_arc->count_valid = 1;
	      inv_arc->count = total;
	      blk->num_succ--;
	      dst->num_pred--;
	      if (dst->count_valid)
		{
		  if (dst->num_pred == 1 && !dst->valid_chain)
		    {
		      dst->chain = valid_blocks;
		      dst->valid_chain = 1;
		      valid_blocks = dst;
		    }
		}
	      else
		{
		  if (!dst->num_pred && !dst->invalid_chain)
		    {
		      dst->chain = invalid_blocks;
		      dst->invalid_chain = 1;
		      invalid_blocks = dst;
		    }
		}
	    }
	  if (blk->num_pred == 1)
	    {
	      block_t *src;

	      total = blk->count;
	      inv_arc = NULL;
	      for (arc = blk->pred; arc; arc = arc->pred_next)
		{
		  total -= arc->count;
		  if (!arc->count_valid)
		    inv_arc = arc;
		}
	      src = inv_arc->src;
	      inv_arc->count_valid = 1;
	      inv_arc->count = total;
	      blk->num_pred--;
	      src->num_succ--;
	      if (src->count_valid)
		{
		  if (src->num_succ == 1 && !src->valid_chain)
		    {
		      src->chain = valid_blocks;
		      src->valid_chain = 1;
		      valid_blocks = src;
		    }
		}
	      else
		{
		  if (!src->num_succ && !src->invalid_chain)
		    {
		      src->chain = invalid_blocks;
		      src->invalid_chain = 1;
		      invalid_blocks = src;
		    }
		}
	    }
	}
    }

  /* If the graph has been correctly solved, every block will have a
     valid count.  */
  for (ix = 0; ix < fn->num_blocks; ix++)
    if (!fn->blocks[ix].count_valid)
      {
	fnotice (stderr, "%s:graph is unsolvable for '%s'\n",
		 bbg_file_name, fn->name);
	break;
      }
}

/* Mark all the blocks only reachable via an incoming catch.  */

static void
find_exception_blocks (function_t *fn)
{
  unsigned ix;
  block_t **queue = XALLOCAVEC (block_t *, fn->num_blocks);

  /* First mark all blocks as exceptional.  */
  for (ix = fn->num_blocks; ix--;)
    fn->blocks[ix].exceptional = 1;

  /* Now mark all the blocks reachable via non-fake edges */
  queue[0] = fn->blocks;
  queue[0]->exceptional = 0;
  for (ix = 1; ix;)
    {
      block_t *block = queue[--ix];
      const arc_t *arc;
      
      for (arc = block->succ; arc; arc = arc->succ_next)
	if (!arc->fake && !arc->is_throw && arc->dst->exceptional)
	  {
	    arc->dst->exceptional = 0;
	    queue[ix++] = arc->dst;
	  }
    }
}


/* Increment totals in COVERAGE according to arc ARC.  */

static void
add_branch_counts (coverage_t *coverage, const arc_t *arc)
{
  if (arc->is_call_non_return)
    {
      coverage->calls++;
      if (arc->src->count)
	coverage->calls_executed++;
    }
  else if (!arc->is_unconditional)
    {
      coverage->branches++;
      if (arc->src->count)
	coverage->branches_executed++;
      if (arc->count)
	coverage->branches_taken++;
    }
}

/* Format a GCOV_TYPE integer as either a percent ratio, or absolute
   count.  If dp >= 0, format TOP/BOTTOM * 100 to DP decimal places.
   If DP is zero, no decimal point is printed. Only print 100% when
   TOP==BOTTOM and only print 0% when TOP=0.  If dp < 0, then simply
   format TOP.  Return pointer to a static string.  */

static char const *
format_gcov (gcov_type top, gcov_type bottom, int dp)
{
  static char buffer[20];

  if (dp >= 0)
    {
      float ratio = bottom ? (float)top / bottom : 0;
      int ix;
      unsigned limit = 100;
      unsigned percent;

      for (ix = dp; ix--; )
	limit *= 10;

      percent = (unsigned) (ratio * limit + (float)0.5);
      if (percent <= 0 && top)
	percent = 1;
      else if (percent >= limit && top != bottom)
	percent = limit - 1;
      ix = sprintf (buffer, "%.*u%%", dp + 1, percent);
      if (dp)
	{
	  dp++;
	  do
	    {
	      buffer[ix+1] = buffer[ix];
	      ix--;
	    }
	  while (dp--);
	  buffer[ix + 1] = '.';
	}
    }
  else
    sprintf (buffer, HOST_WIDEST_INT_PRINT_DEC, (HOST_WIDEST_INT)top);

  return buffer;
}

/* Summary of execution */

static void
executed_summary (unsigned lines, unsigned executed)
{
  if (lines)
    fnotice (stdout, "Lines executed:%s of %d\n",
	     format_gcov (executed, lines, 2), lines);
  else
    fnotice (stdout, "No executable lines\n");
}
  
/* Output summary info for a function or file.  */

static void
function_summary (const coverage_t *coverage, const char *title)
{
  fnotice (stdout, "%s '%s'\n", title, coverage->name);
  executed_summary (coverage->lines, coverage->lines_executed);

  if (flag_branches)
    {
      if (coverage->branches)
	{
	  fnotice (stdout, "Branches executed:%s of %d\n",
		   format_gcov (coverage->branches_executed,
				coverage->branches, 2),
		   coverage->branches);
	  fnotice (stdout, "Taken at least once:%s of %d\n",
		   format_gcov (coverage->branches_taken,
				coverage->branches, 2),
		   coverage->branches);
	}
      else
	fnotice (stdout, "No branches\n");
      if (coverage->calls)
	fnotice (stdout, "Calls executed:%s of %d\n",
		 format_gcov (coverage->calls_executed, coverage->calls, 2),
		 coverage->calls);
      else
	fnotice (stdout, "No calls\n");
    }
}

/* Canonicalize the filename NAME by canonicalizing directory
   separators, eliding . components and resolving .. components
   appropriately.  Always returns a unique string.  */

static char *
canonicalize_name (const char *name)
{
  /* The canonical name cannot be longer than the incoming name.  */
  char *result = XNEWVEC (char, strlen (name) + 1);
  const char *base = name, *probe;
  char *ptr = result;
  char *dd_base;
  int slash = 0;

#if HAVE_DOS_BASED_FILE_SYSTEM
  if (base[0] && base[1] == ':')
    {
      result[0] = base[0];
      result[1] = ':';
      base += 2;
      ptr += 2;
    }
#endif
  for (dd_base = ptr; *base; base = probe)
    {
      size_t len;
      
      for (probe = base; *probe; probe++)
	if (IS_DIR_SEPARATOR (*probe))
	  break;

      len = probe - base;
      if (len == 1 && base[0] == '.')
	/* Elide a '.' directory */
	;
      else if (len == 2 && base[0] == '.' && base[1] == '.')
	{
	  /* '..', we can only elide it and the previous directory, if
	     we're not a symlink.  */
	  struct stat ATTRIBUTE_UNUSED buf;

	  *ptr = 0;
	  if (dd_base == ptr
#if defined (S_ISLNK)
	      /* S_ISLNK is not POSIX.1-1996.  */
	      || stat (result, &buf) || S_ISLNK (buf.st_mode)
#endif
	      )
	    {
	      /* Cannot elide, or unreadable or a symlink.  */
	      dd_base = ptr + 2 + slash;
	      goto regular;
	    }
	  while (ptr != dd_base && *ptr != '/')
	    ptr--;
	  slash = ptr != result;
	}
      else
	{
	regular:
	  /* Regular pathname component.  */
	  if (slash)
	    *ptr++ = '/';
	  memcpy (ptr, base, len);
	  ptr += len;
	  slash = 1;
	}

      for (; IS_DIR_SEPARATOR (*probe); probe++)
	continue;
    }
  *ptr = 0;

  return result;
}

/* Generate an output file name. INPUT_NAME is the canonicalized main
   input file and SRC_NAME is the canonicalized file name.
   LONG_OUTPUT_NAMES and PRESERVE_PATHS affect name generation.  With
   long_output_names we prepend the processed name of the input file
   to each output name (except when the current source file is the
   input file, so you don't get a double concatenation). The two
   components are separated by '##'.  With preserve_paths we create a
   filename from all path components of the source file, replacing '/'
   with '#', and .. with '^', without it we simply take the basename
   component.  (Remember, the canonicalized name will already have
   elided '.' components and converted \\ separators.)  */

static char *
make_gcov_file_name (const char *input_name, const char *src_name)
{
  char *ptr;
  char *result;

  if (flag_long_names && input_name && strcmp (src_name, input_name))
    {
      /* Generate the input filename part.  */
      result = XNEWVEC (char, strlen (input_name) + strlen (src_name) + 10);
  
      ptr = result;
      ptr = mangle_name (input_name, ptr);
      ptr[0] = ptr[1] = '#';
      ptr += 2;
    }
  else
    {
      result = XNEWVEC (char, strlen (src_name) + 10);
      ptr = result;
    }

  ptr = mangle_name (src_name, ptr);
  strcpy (ptr, ".gcov");
  
  return result;
}

static char *
mangle_name (char const *base, char *ptr)
{
  size_t len;
  
  /* Generate the source filename part.  */
  if (!flag_preserve_paths)
    {
      base = lbasename (base);
      len = strlen (base);
      memcpy (ptr, base, len);
      ptr += len;
    }
  else
    {
      /* Convert '/' to '#', convert '..' to '^',
	 convert ':' to '~' on DOS based file system.  */
      const char *probe;

#if HAVE_DOS_BASED_FILE_SYSTEM
      if (base[0] && base[1] == ':')
	{
	  ptr[0] = base[0];
	  ptr[1] = '~';
	  ptr += 2;
	  base += 2;
	}
#endif
      for (; *base; base = probe)
	{
	  size_t len;

	  for (probe = base; *probe; probe++)
	    if (*probe == '/')
	      break;
	  len = probe - base;
	  if (len == 2 && base[0] == '.' && base[1] == '.')
	    *ptr++ = '^';
	  else
	    {
	      memcpy (ptr, base, len);
	      ptr += len;
	    }
	  if (*probe)
	    {
	      *ptr++ = '#';
	      probe++;
	    }
	}
    }
  
  return ptr;
}

/* Scan through the bb_data for each line in the block, increment
   the line number execution count indicated by the execution count of
   the appropriate basic block.  */

static void
add_line_counts (coverage_t *coverage, function_t *fn)
{
  unsigned ix;
  line_t *line = NULL; /* This is propagated from one iteration to the
			  next.  */

  /* Scan each basic block.  */
  for (ix = 0; ix != fn->num_blocks; ix++)
    {
      block_t *block = &fn->blocks[ix];
      unsigned *encoding;
      const source_t *src = NULL;
      unsigned jx;

      if (block->count && ix && ix + 1 != fn->num_blocks)
	fn->blocks_executed++;
      for (jx = 0, encoding = block->u.line.encoding;
	   jx != block->u.line.num; jx++, encoding++)
	if (!*encoding)
	  {
	    src = &sources[*++encoding];
	    jx++;
	  }
	else
	  {
	    line = &src->lines[*encoding];

	    if (coverage)
	      {
		if (!line->exists)
		  coverage->lines++;
		if (!line->count && block->count)
		  coverage->lines_executed++;
	      }
	    line->exists = 1;
	    if (!block->exceptional)
	      line->unexceptional = 1;
	    line->count += block->count;
	  }
      free (block->u.line.encoding);
      block->u.cycle.arc = NULL;
      block->u.cycle.ident = ~0U;

      if (!ix || ix + 1 == fn->num_blocks)
	/* Entry or exit block */;
      else if (flag_all_blocks)
	{
	  line_t *block_line = line;

	  if (!block_line)
	    block_line = &sources[fn->src].lines[fn->line];

	  block->chain = block_line->u.blocks;
	  block_line->u.blocks = block;
	}
      else if (flag_branches)
	{
	  arc_t *arc;

	  for (arc = block->succ; arc; arc = arc->succ_next)
	    {
	      arc->line_next = line->u.branches;
	      line->u.branches = arc;
	      if (coverage && !arc->is_unconditional)
		add_branch_counts (coverage, arc);
	    }
	}
    }
  if (!line)
    fnotice (stderr, "%s:no lines for '%s'\n", bbg_file_name, fn->name);
}

/* Accumulate the line counts of a file.  */

static void
accumulate_line_counts (source_t *src)
{
  line_t *line;
  function_t *fn, *fn_p, *fn_n;
  unsigned ix;

  /* Reverse the function order.  */
  for (fn = src->functions, fn_p = NULL; fn;
       fn_p = fn, fn = fn_n)
    {
      fn_n = fn->line_next;
      fn->line_next = fn_p;
    }
  src->functions = fn_p;

  for (ix = src->num_lines, line = src->lines; ix--; line++)
    {
      if (!flag_all_blocks)
	{
	  arc_t *arc, *arc_p, *arc_n;

	  /* Total and reverse the branch information.  */
	  for (arc = line->u.branches, arc_p = NULL; arc;
	       arc_p = arc, arc = arc_n)
	    {
	      arc_n = arc->line_next;
	      arc->line_next = arc_p;

	      add_branch_counts (&src->coverage, arc);
	    }
	  line->u.branches = arc_p;
	}
      else if (line->u.blocks)
	{
	  /* The user expects the line count to be the number of times
	     a line has been executed. Simply summing the block count
	     will give an artificially high number.  The Right Thing
	     is to sum the entry counts to the graph of blocks on this
	     line, then find the elementary cycles of the local graph
	     and add the transition counts of those cycles.  */
	  block_t *block, *block_p, *block_n;
	  gcov_type count = 0;

	  /* Reverse the block information.  */
	  for (block = line->u.blocks, block_p = NULL; block;
	       block_p = block, block = block_n)
	    {
	      block_n = block->chain;
	      block->chain = block_p;
	      block->u.cycle.ident = ix;
	    }
	  line->u.blocks = block_p;

	  /* Sum the entry arcs.  */
	  for (block = line->u.blocks; block; block = block->chain)
	    {
	      arc_t *arc;

	      for (arc = block->pred; arc; arc = arc->pred_next)
		{
		  if (arc->src->u.cycle.ident != ix)
		    count += arc->count;
		  if (flag_branches)
		    add_branch_counts (&src->coverage, arc);
		}

	      /* Initialize the cs_count.  */
	      for (arc = block->succ; arc; arc = arc->succ_next)
		arc->cs_count = arc->count;
	    }

	  /* Find the loops. This uses the algorithm described in
	     Tiernan 'An Efficient Search Algorithm to Find the
	     Elementary Circuits of a Graph', CACM Dec 1970. We hold
	     the P array by having each block point to the arc that
	     connects to the previous block. The H array is implicitly
	     held because of the arc ordering, and the block's
	     previous arc pointer.

	     Although the algorithm is O(N^3) for highly connected
	     graphs, at worst we'll have O(N^2), as most blocks have
	     only one or two exits. Most graphs will be small.

	     For each loop we find, locate the arc with the smallest
	     transition count, and add that to the cumulative
	     count.  Decrease flow over the cycle and remove the arc
	     from consideration.  */
	  for (block = line->u.blocks; block; block = block->chain)
	    {
	      block_t *head = block;
	      arc_t *arc;

	    next_vertex:;
	      arc = head->succ;
	    current_vertex:;
	      while (arc)
		{
		  block_t *dst = arc->dst;
		  if (/* Already used that arc.  */
		      arc->cycle
		      /* Not to same graph, or before first vertex.  */
		      || dst->u.cycle.ident != ix
		      /* Already in path.  */
		      || dst->u.cycle.arc)
		    {
		      arc = arc->succ_next;
		      continue;
		    }

		  if (dst == block)
		    {
		      /* Found a closing arc.  */
		      gcov_type cycle_count = arc->cs_count;
		      arc_t *cycle_arc = arc;
		      arc_t *probe_arc;

		      /* Locate the smallest arc count of the loop.  */
		      for (dst = head; (probe_arc = dst->u.cycle.arc);
			   dst = probe_arc->src)
			if (cycle_count > probe_arc->cs_count)
			  {
			    cycle_count = probe_arc->cs_count;
			    cycle_arc = probe_arc;
			  }

		      count += cycle_count;
		      cycle_arc->cycle = 1;

		      /* Remove the flow from the cycle.  */
		      arc->cs_count -= cycle_count;
		      for (dst = head; (probe_arc = dst->u.cycle.arc);
			   dst = probe_arc->src)
			probe_arc->cs_count -= cycle_count;

		      /* Unwind to the cyclic arc.  */
		      while (head != cycle_arc->src)
			{
			  arc = head->u.cycle.arc;
			  head->u.cycle.arc = NULL;
			  head = arc->src;
			}
		      /* Move on.  */
		      arc = arc->succ_next;
		      continue;
		    }

		  /* Add new block to chain.  */
		  dst->u.cycle.arc = arc;
		  head = dst;
		  goto next_vertex;
		}
	      /* We could not add another vertex to the path. Remove
		 the last vertex from the list.  */
	      arc = head->u.cycle.arc;
	      if (arc)
		{
		  /* It was not the first vertex. Move onto next arc.  */
		  head->u.cycle.arc = NULL;
		  head = arc->src;
		  arc = arc->succ_next;
		  goto current_vertex;
		}
	      /* Mark this block as unusable.  */
	      block->u.cycle.ident = ~0U;
	    }

	  line->count = count;
	}

      if (line->exists)
	{
	  src->coverage.lines++;
	  if (line->count)
	    src->coverage.lines_executed++;
	}
    }
}

/* Output information about ARC number IX.  Returns nonzero if
   anything is output.  */

static int
output_branch_count (FILE *gcov_file, int ix, const arc_t *arc)
{
  if (arc->is_call_non_return)
    {
      if (arc->src->count)
	{
	  fnotice (gcov_file, "call   %2d returned %s\n", ix,
		   format_gcov (arc->src->count - arc->count,
				arc->src->count, -flag_counts));
	}
      else
	fnotice (gcov_file, "call   %2d never executed\n", ix);
    }
  else if (!arc->is_unconditional)
    {
      if (arc->src->count)
	fnotice (gcov_file, "branch %2d taken %s%s\n", ix,
		 format_gcov (arc->count, arc->src->count, -flag_counts),
		 arc->fall_through ? " (fallthrough)"
		 : arc->is_throw ? " (throw)" : "");
      else
	fnotice (gcov_file, "branch %2d never executed\n", ix);
    }
  else if (flag_unconditional && !arc->dst->is_call_return)
    {
      if (arc->src->count)
	fnotice (gcov_file, "unconditional %2d taken %s\n", ix,
		 format_gcov (arc->count, arc->src->count, -flag_counts));
      else
	fnotice (gcov_file, "unconditional %2d never executed\n", ix);
    }
  else
    return 0;
  return 1;

}

static const char *
read_line (FILE *file)
{
  static char *string;
  static size_t string_len;
  size_t pos = 0;
  char *ptr;

  if (!string_len)
    {
      string_len = 200;
      string = XNEWVEC (char, string_len);
    }

  while ((ptr = fgets (string + pos, string_len - pos, file)))
    {
      size_t len = strlen (string + pos);

      if (string[pos + len - 1] == '\n')
	{
	  string[pos + len - 1] = 0;
	  return string;
	}
      pos += len;
      string = XRESIZEVEC (char, string, string_len * 2);
      string_len *= 2;
    }
      
  return pos ? string : NULL;
}

/* Read in the source file one line at a time, and output that line to
   the gcov file preceded by its execution count and other
   information.  */

static void
output_lines (FILE *gcov_file, const source_t *src)
{
  FILE *source_file;
  unsigned line_num;	/* current line number.  */
  const line_t *line;           /* current line info ptr.  */
  const char *retval = "";	/* status of source file reading.  */
  function_t *fn = NULL;

  fprintf (gcov_file, "%9s:%5d:Source:%s\n", "-", 0, src->coverage.name);
  if (!multiple_files)
    {
      fprintf (gcov_file, "%9s:%5d:Graph:%s\n", "-", 0, bbg_file_name);
      fprintf (gcov_file, "%9s:%5d:Data:%s\n", "-", 0,
	       no_data_file ? "-" : da_file_name);
      fprintf (gcov_file, "%9s:%5d:Runs:%u\n", "-", 0, object_runs);
    }
  fprintf (gcov_file, "%9s:%5d:Programs:%u\n", "-", 0, program_count);

  source_file = fopen (src->name, "r");
  if (!source_file)
    {
      fnotice (stderr, "Cannot open source file %s\n", src->name);
      retval = NULL;
    }
  else if (src->file_time == 0)
    fprintf (gcov_file, "%9s:%5d:Source is newer than graph\n", "-", 0);

  if (flag_branches)
    fn = src->functions;

  for (line_num = 1, line = &src->lines[line_num];
       line_num < src->num_lines; line_num++, line++)
    {
      for (; fn && fn->line == line_num; fn = fn->line_next)
	{
	  arc_t *arc = fn->blocks[EXIT_BLOCK].pred;
	  gcov_type return_count = fn->blocks[EXIT_BLOCK].count;
	  gcov_type called_count = fn->blocks[ENTRY_BLOCK].count;

	  for (; arc; arc = arc->pred_next)
	    if (arc->fake)
	      return_count -= arc->count;

	  fprintf (gcov_file, "function %s", flag_demangled_names ?
                   fn->demangled_name : fn->name);
	  fprintf (gcov_file, " called %s",
		   format_gcov (called_count, 0, -1));
	  fprintf (gcov_file, " returned %s",
		   format_gcov (return_count, called_count, 0));
	  fprintf (gcov_file, " blocks executed %s",
		   format_gcov (fn->blocks_executed, fn->num_blocks - 2, 0));
	  fprintf (gcov_file, "\n");
	}

      if (retval)
	retval = read_line (source_file);

      /* For lines which don't exist in the .bb file, print '-' before
	 the source line.  For lines which exist but were never
	 executed, print '#####' or '=====' before the source line.
	 Otherwise, print the execution count before the source line.
	 There are 16 spaces of indentation added before the source
	 line so that tabs won't be messed up.  */
      fprintf (gcov_file, "%9s:%5u:%s\n",
	       !line->exists ? "-" : line->count
	       ? format_gcov (line->count, 0, -1)
	       : line->unexceptional ? "#####" : "=====", line_num,
	       retval ? retval : "/*EOF*/");

      if (flag_all_blocks)
	{
	  block_t *block;
	  arc_t *arc;
	  int ix, jx;

	  for (ix = jx = 0, block = line->u.blocks; block;
	       block = block->chain)
	    {
	      if (!block->is_call_return)
		fprintf (gcov_file, "%9s:%5u-block %2d\n",
			 !line->exists ? "-" : block->count
			 ? format_gcov (block->count, 0, -1)
			 : block->exceptional ? "%%%%%" : "$$$$$",
			 line_num, ix++);
	      if (flag_branches)
		for (arc = block->succ; arc; arc = arc->succ_next)
		  jx += output_branch_count (gcov_file, jx, arc);
	    }
	}
      else if (flag_branches)
	{
	  int ix;
	  arc_t *arc;

	  for (ix = 0, arc = line->u.branches; arc; arc = arc->line_next)
	    ix += output_branch_count (gcov_file, ix, arc);
	}
    }

  /* Handle all remaining source lines.  There may be lines after the
     last line of code.  */
  if (retval)
    {
      for (; (retval = read_line (source_file)); line_num++)
	fprintf (gcov_file, "%9s:%5u:%s\n", "-", line_num, retval);
    }

  if (source_file)
    fclose (source_file);
}