aboutsummaryrefslogtreecommitdiff
path: root/gdb/c-exp.y
blob: fb85914805cf6bb777409ffb062058c259581625 (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
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
/* YACC parser for C expressions, for GDB.
   Copyright (C) 1986-2024 Free Software Foundation, Inc.

   This file is part of GDB.

   This program 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 of the License, or
   (at your option) any later version.

   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* Parse a C expression from text in a string,
   and return the result as a  struct expression  pointer.
   That structure contains arithmetic operations in reverse polish,
   with constants represented by operations that are followed by special data.
   See expression.h for the details of the format.
   What is important here is that it can be built up sequentially
   during the process of parsing; the lower levels of the tree always
   come first in the result.

   Note that malloc's and realloc's in this file are transformed to
   xmalloc and xrealloc respectively by the same sed command in the
   makefile that remaps any other malloc/realloc inserted by the parser
   generator.  Doing this with #defines and trying to control the interaction
   with include files (<malloc.h> and <stdlib.h> for example) just became
   too messy, particularly when such includes can be inserted at random
   times by the parser generator.  */

%{

#include "defs.h"
#include <ctype.h>
#include "expression.h"
#include "value.h"
#include "parser-defs.h"
#include "language.h"
#include "c-lang.h"
#include "c-support.h"
#include "charset.h"
#include "block.h"
#include "cp-support.h"
#include "macroscope.h"
#include "objc-lang.h"
#include "typeprint.h"
#include "cp-abi.h"
#include "type-stack.h"
#include "target-float.h"
#include "c-exp.h"

#define parse_type(ps) builtin_type (ps->gdbarch ())

/* Remap normal yacc parser interface names (yyparse, yylex, yyerror,
   etc).  */
#define GDB_YY_REMAP_PREFIX c_
#include "yy-remap.h"

/* The state of the parser, used internally when we are parsing the
   expression.  */

static struct parser_state *pstate = NULL;

/* Data that must be held for the duration of a parse.  */

struct c_parse_state
{
  /* These are used to hold type lists and type stacks that are
     allocated during the parse.  */
  std::vector<std::unique_ptr<std::vector<struct type *>>> type_lists;
  std::vector<std::unique_ptr<struct type_stack>> type_stacks;

  /* Storage for some strings allocated during the parse.  */
  std::vector<gdb::unique_xmalloc_ptr<char>> strings;

  /* When we find that lexptr (the global var defined in parse.c) is
     pointing at a macro invocation, we expand the invocation, and call
     scan_macro_expansion to save the old lexptr here and point lexptr
     into the expanded text.  When we reach the end of that, we call
     end_macro_expansion to pop back to the value we saved here.  The
     macro expansion code promises to return only fully-expanded text,
     so we don't need to "push" more than one level.

     This is disgusting, of course.  It would be cleaner to do all macro
     expansion beforehand, and then hand that to lexptr.  But we don't
     really know where the expression ends.  Remember, in a command like

     (gdb) break *ADDRESS if CONDITION

     we evaluate ADDRESS in the scope of the current frame, but we
     evaluate CONDITION in the scope of the breakpoint's location.  So
     it's simply wrong to try to macro-expand the whole thing at once.  */
  const char *macro_original_text = nullptr;

  /* We save all intermediate macro expansions on this obstack for the
     duration of a single parse.  The expansion text may sometimes have
     to live past the end of the expansion, due to yacc lookahead.
     Rather than try to be clever about saving the data for a single
     token, we simply keep it all and delete it after parsing has
     completed.  */
  auto_obstack expansion_obstack;

  /* The type stack.  */
  struct type_stack type_stack;
};

/* This is set and cleared in c_parse.  */

static struct c_parse_state *cpstate;

int yyparse (void);

static int yylex (void);

static void yyerror (const char *);

static int type_aggregate_p (struct type *);

using namespace expr;
%}

/* Although the yacc "value" of an expression is not used,
   since the result is stored in the structure being created,
   other node types do have values.  */

%union
  {
    LONGEST lval;
    struct {
      LONGEST val;
      struct type *type;
    } typed_val_int;
    struct {
      gdb_byte val[16];
      struct type *type;
    } typed_val_float;
    struct type *tval;
    struct stoken sval;
    struct typed_stoken tsval;
    struct ttype tsym;
    struct symtoken ssym;
    int voidval;
    const struct block *bval;
    enum exp_opcode opcode;

    struct stoken_vector svec;
    std::vector<struct type *> *tvec;

    struct type_stack *type_stack;

    struct objc_class_str theclass;
  }

%{
/* YYSTYPE gets defined by %union */
static int parse_number (struct parser_state *par_state,
			 const char *, int, int, YYSTYPE *);
static struct stoken operator_stoken (const char *);
static struct stoken typename_stoken (const char *);
static void check_parameter_typelist (std::vector<struct type *> *);

#if defined(YYBISON) && YYBISON < 30800
static void c_print_token (FILE *file, int type, YYSTYPE value);
#define YYPRINT(FILE, TYPE, VALUE) c_print_token (FILE, TYPE, VALUE)
#endif
%}

%type <voidval> exp exp1 type_exp start variable qualified_name lcurly function_method
%type <lval> rcurly
%type <tval> type typebase scalar_type
%type <tvec> nonempty_typelist func_mod parameter_typelist
/* %type <bval> block */

/* Fancy type parsing.  */
%type <tval> ptype
%type <lval> array_mod
%type <tval> conversion_type_id

%type <type_stack> ptr_operator_ts abs_decl direct_abs_decl

%token <typed_val_int> INT COMPLEX_INT
%token <typed_val_float> FLOAT COMPLEX_FLOAT

/* Both NAME and TYPENAME tokens represent symbols in the input,
   and both convey their data as strings.
   But a TYPENAME is a string that happens to be defined as a typedef
   or builtin type name (such as int or char)
   and a NAME is any other symbol.
   Contexts where this distinction is not important can use the
   nonterminal "name", which matches either NAME or TYPENAME.  */

%token <tsval> STRING
%token <sval> NSSTRING		/* ObjC Foundation "NSString" literal */
%token SELECTOR			/* ObjC "@selector" pseudo-operator   */
%token <tsval> CHAR
%token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
%token <ssym> UNKNOWN_CPP_NAME
%token <voidval> COMPLETE
%token <tsym> TYPENAME
%token <theclass> CLASSNAME	/* ObjC Class name */
%type <sval> name field_name
%type <svec> string_exp
%type <ssym> name_not_typename
%type <tsym> type_name

 /* This is like a '[' token, but is only generated when parsing
    Objective C.  This lets us reuse the same parser without
    erroneously parsing ObjC-specific expressions in C.  */
%token OBJC_LBRAC

/* A NAME_OR_INT is a symbol which is not known in the symbol table,
   but which would parse as a valid number in the current input radix.
   E.g. "c" when input_radix==16.  Depending on the parse, it will be
   turned into a name or into a number.  */

%token <ssym> NAME_OR_INT

%token OPERATOR
%token STRUCT CLASS UNION ENUM SIZEOF ALIGNOF UNSIGNED COLONCOLON
%token TEMPLATE
%token ERROR
%token NEW DELETE
%type <sval> oper
%token REINTERPRET_CAST DYNAMIC_CAST STATIC_CAST CONST_CAST
%token ENTRY
%token TYPEOF
%token DECLTYPE
%token TYPEID

/* Special type cases, put in to allow the parser to distinguish different
   legal basetypes.  */
%token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD DOUBLE_KEYWORD
%token RESTRICT ATOMIC
%token FLOAT_KEYWORD COMPLEX

%token <sval> DOLLAR_VARIABLE

%token <opcode> ASSIGN_MODIFY

/* C++ */
%token TRUEKEYWORD
%token FALSEKEYWORD


%left ','
%left ABOVE_COMMA
%right '=' ASSIGN_MODIFY
%right '?'
%left OROR
%left ANDAND
%left '|'
%left '^'
%left '&'
%left EQUAL NOTEQUAL
%left '<' '>' LEQ GEQ
%left LSH RSH
%left '@'
%left '+' '-'
%left '*' '/' '%'
%right UNARY INCREMENT DECREMENT
%right ARROW ARROW_STAR '.' DOT_STAR '[' OBJC_LBRAC '('
%token <ssym> BLOCKNAME
%token <bval> FILENAME
%type <bval> block
%left COLONCOLON

%token DOTDOTDOT


%%

start   :	exp1
	|	type_exp
	;

type_exp:	type
			{
			  pstate->push_new<type_operation> ($1);
			}
	|	TYPEOF '(' exp ')'
			{
			  pstate->wrap<typeof_operation> ();
			}
	|	TYPEOF '(' type ')'
			{
			  pstate->push_new<type_operation> ($3);
			}
	|	DECLTYPE '(' exp ')'
			{
			  pstate->wrap<decltype_operation> ();
			}
	;

/* Expressions, including the comma operator.  */
exp1	:	exp
	|	exp1 ',' exp
			{ pstate->wrap2<comma_operation> (); }
	;

/* Expressions, not including the comma operator.  */
exp	:	'*' exp    %prec UNARY
			{ pstate->wrap<unop_ind_operation> (); }
	;

exp	:	'&' exp    %prec UNARY
			{ pstate->wrap<unop_addr_operation> (); }
	;

exp	:	'-' exp    %prec UNARY
			{ pstate->wrap<unary_neg_operation> (); }
	;

exp	:	'+' exp    %prec UNARY
			{ pstate->wrap<unary_plus_operation> (); }
	;

exp	:	'!' exp    %prec UNARY
			{
			  if (pstate->language ()->la_language
			      == language_opencl)
			    pstate->wrap<opencl_not_operation> ();
			  else
			    pstate->wrap<unary_logical_not_operation> ();
			}
	;

exp	:	'~' exp    %prec UNARY
			{ pstate->wrap<unary_complement_operation> (); }
	;

exp	:	INCREMENT exp    %prec UNARY
			{ pstate->wrap<preinc_operation> (); }
	;

exp	:	DECREMENT exp    %prec UNARY
			{ pstate->wrap<predec_operation> (); }
	;

exp	:	exp INCREMENT    %prec UNARY
			{ pstate->wrap<postinc_operation> (); }
	;

exp	:	exp DECREMENT    %prec UNARY
			{ pstate->wrap<postdec_operation> (); }
	;

exp	:	TYPEID '(' exp ')' %prec UNARY
			{ pstate->wrap<typeid_operation> (); }
	;

exp	:	TYPEID '(' type_exp ')' %prec UNARY
			{ pstate->wrap<typeid_operation> (); }
	;

exp	:	SIZEOF exp       %prec UNARY
			{ pstate->wrap<unop_sizeof_operation> (); }
	;

exp	:	ALIGNOF '(' type_exp ')'	%prec UNARY
			{ pstate->wrap<unop_alignof_operation> (); }
	;

exp	:	exp ARROW field_name
			{
			  pstate->push_new<structop_ptr_operation>
			    (pstate->pop (), copy_name ($3));
			}
	;

exp	:	exp ARROW field_name COMPLETE
			{
			  structop_base_operation *op
			    = new structop_ptr_operation (pstate->pop (),
							  copy_name ($3));
			  pstate->mark_struct_expression (op);
			  pstate->push (operation_up (op));
			}
	;

exp	:	exp ARROW COMPLETE
			{
			  structop_base_operation *op
			    = new structop_ptr_operation (pstate->pop (), "");
			  pstate->mark_struct_expression (op);
			  pstate->push (operation_up (op));
			}
	;

exp	:	exp ARROW '~' name
			{
			  pstate->push_new<structop_ptr_operation>
			    (pstate->pop (), "~" + copy_name ($4));
			}
	;

exp	:	exp ARROW '~' name COMPLETE
			{
			  structop_base_operation *op
			    = new structop_ptr_operation (pstate->pop (),
							  "~" + copy_name ($4));
			  pstate->mark_struct_expression (op);
			  pstate->push (operation_up (op));
			}
	;

exp	:	exp ARROW qualified_name
			{ /* exp->type::name becomes exp->*(&type::name) */
			  /* Note: this doesn't work if name is a
			     static member!  FIXME */
			  pstate->wrap<unop_addr_operation> ();
			  pstate->wrap2<structop_mptr_operation> (); }
	;

exp	:	exp ARROW_STAR exp
			{ pstate->wrap2<structop_mptr_operation> (); }
	;

exp	:	exp '.' field_name
			{
			  if (pstate->language ()->la_language
			      == language_opencl)
			    pstate->push_new<opencl_structop_operation>
			      (pstate->pop (), copy_name ($3));
			  else
			    pstate->push_new<structop_operation>
			      (pstate->pop (), copy_name ($3));
			}
	;

exp	:	exp '.' field_name COMPLETE
			{
			  structop_base_operation *op
			    = new structop_operation (pstate->pop (),
						      copy_name ($3));
			  pstate->mark_struct_expression (op);
			  pstate->push (operation_up (op));
			}
	;

exp	:	exp '.' COMPLETE
			{
			  structop_base_operation *op
			    = new structop_operation (pstate->pop (), "");
			  pstate->mark_struct_expression (op);
			  pstate->push (operation_up (op));
			}
	;

exp	:	exp '.' '~' name
			{
			  pstate->push_new<structop_operation>
			    (pstate->pop (), "~" + copy_name ($4));
			}
	;

exp	:	exp '.' '~' name COMPLETE
			{
			  structop_base_operation *op
			    = new structop_operation (pstate->pop (),
						      "~" + copy_name ($4));
			  pstate->mark_struct_expression (op);
			  pstate->push (operation_up (op));
			}
	;

exp	:	exp '.' qualified_name
			{ /* exp.type::name becomes exp.*(&type::name) */
			  /* Note: this doesn't work if name is a
			     static member!  FIXME */
			  pstate->wrap<unop_addr_operation> ();
			  pstate->wrap2<structop_member_operation> (); }
	;

exp	:	exp DOT_STAR exp
			{ pstate->wrap2<structop_member_operation> (); }
	;

exp	:	exp '[' exp1 ']'
			{ pstate->wrap2<subscript_operation> (); }
	;

exp	:	exp OBJC_LBRAC exp1 ']'
			{ pstate->wrap2<subscript_operation> (); }
	;

/*
 * The rules below parse ObjC message calls of the form:
 *	'[' target selector {':' argument}* ']'
 */

exp	: 	OBJC_LBRAC TYPENAME
			{
			  CORE_ADDR theclass;

			  std::string copy = copy_name ($2.stoken);
			  theclass = lookup_objc_class (pstate->gdbarch (),
							copy.c_str ());
			  if (theclass == 0)
			    error (_("%s is not an ObjC Class"),
				   copy.c_str ());
			  pstate->push_new<long_const_operation>
			    (parse_type (pstate)->builtin_int,
			     (LONGEST) theclass);
			  start_msglist();
			}
		msglist ']'
			{ end_msglist (pstate); }
	;

exp	:	OBJC_LBRAC CLASSNAME
			{
			  pstate->push_new<long_const_operation>
			    (parse_type (pstate)->builtin_int,
			     (LONGEST) $2.theclass);
			  start_msglist();
			}
		msglist ']'
			{ end_msglist (pstate); }
	;

exp	:	OBJC_LBRAC exp
			{ start_msglist(); }
		msglist ']'
			{ end_msglist (pstate); }
	;

msglist :	name
			{ add_msglist(&$1, 0); }
	|	msgarglist
	;

msgarglist :	msgarg
	|	msgarglist msgarg
	;

msgarg	:	name ':' exp
			{ add_msglist(&$1, 1); }
	|	':' exp	/* Unnamed arg.  */
			{ add_msglist(0, 1);   }
	|	',' exp	/* Variable number of args.  */
			{ add_msglist(0, 0);   }
	;

exp	:	exp '('
			/* This is to save the value of arglist_len
			   being accumulated by an outer function call.  */
			{ pstate->start_arglist (); }
		arglist ')'	%prec ARROW
			{
			  std::vector<operation_up> args
			    = pstate->pop_vector (pstate->end_arglist ());
			  pstate->push_new<funcall_operation>
			    (pstate->pop (), std::move (args));
			}
	;

/* This is here to disambiguate with the production for
   "func()::static_var" further below, which uses
   function_method_void.  */
exp	:	exp '(' ')' %prec ARROW
			{
			  pstate->push_new<funcall_operation>
			    (pstate->pop (), std::vector<operation_up> ());
			}
	;


exp	:	UNKNOWN_CPP_NAME '('
			{
			  /* This could potentially be a an argument defined
			     lookup function (Koenig).  */
			  /* This is to save the value of arglist_len
			     being accumulated by an outer function call.  */
			  pstate->start_arglist ();
			}
		arglist ')'	%prec ARROW
			{
			  std::vector<operation_up> args
			    = pstate->pop_vector (pstate->end_arglist ());
			  pstate->push_new<adl_func_operation>
			    (copy_name ($1.stoken),
			     pstate->expression_context_block,
			     std::move (args));
			}
	;

lcurly	:	'{'
			{ pstate->start_arglist (); }
	;

arglist	:
	;

arglist	:	exp
			{ pstate->arglist_len = 1; }
	;

arglist	:	arglist ',' exp   %prec ABOVE_COMMA
			{ pstate->arglist_len++; }
	;

function_method:       exp '(' parameter_typelist ')' const_or_volatile
			{
			  std::vector<struct type *> *type_list = $3;
			  /* Save the const/volatile qualifiers as
			     recorded by the const_or_volatile
			     production's actions.  */
			  type_instance_flags flags
			    = (cpstate->type_stack
			       .follow_type_instance_flags ());
			  pstate->push_new<type_instance_operation>
			    (flags, std::move (*type_list),
			     pstate->pop ());
			}
	;

function_method_void:	    exp '(' ')' const_or_volatile
		       {
			  type_instance_flags flags
			    = (cpstate->type_stack
			       .follow_type_instance_flags ());
			  pstate->push_new<type_instance_operation>
			    (flags, std::vector<type *> (), pstate->pop ());
		       }
       ;

exp     :       function_method
	;

/* Normally we must interpret "func()" as a function call, instead of
   a type.  The user needs to write func(void) to disambiguate.
   However, in the "func()::static_var" case, there's no
   ambiguity.  */
function_method_void_or_typelist: function_method
	|               function_method_void
	;

exp     :       function_method_void_or_typelist COLONCOLON name
			{
			  pstate->push_new<func_static_var_operation>
			    (pstate->pop (), copy_name ($3));
			}
	;

rcurly	:	'}'
			{ $$ = pstate->end_arglist () - 1; }
	;
exp	:	lcurly arglist rcurly	%prec ARROW
			{
			  std::vector<operation_up> args
			    = pstate->pop_vector ($3 + 1);
			  pstate->push_new<array_operation> (0, $3,
							     std::move (args));
			}
	;

exp	:	lcurly type_exp rcurly exp  %prec UNARY
			{ pstate->wrap2<unop_memval_type_operation> (); }
	;

exp	:	'(' type_exp ')' exp  %prec UNARY
			{
			  if (pstate->language ()->la_language
			      == language_opencl)
			    pstate->wrap2<opencl_cast_type_operation> ();
			  else
			    pstate->wrap2<unop_cast_type_operation> ();
			}
	;

exp	:	'(' exp1 ')'
			{ }
	;

/* Binary operators in order of decreasing precedence.  */

exp	:	exp '@' exp
			{ pstate->wrap2<repeat_operation> (); }
	;

exp	:	exp '*' exp
			{ pstate->wrap2<mul_operation> (); }
	;

exp	:	exp '/' exp
			{ pstate->wrap2<div_operation> (); }
	;

exp	:	exp '%' exp
			{ pstate->wrap2<rem_operation> (); }
	;

exp	:	exp '+' exp
			{ pstate->wrap2<add_operation> (); }
	;

exp	:	exp '-' exp
			{ pstate->wrap2<sub_operation> (); }
	;

exp	:	exp LSH exp
			{ pstate->wrap2<lsh_operation> (); }
	;

exp	:	exp RSH exp
			{ pstate->wrap2<rsh_operation> (); }
	;

exp	:	exp EQUAL exp
			{
			  if (pstate->language ()->la_language
			      == language_opencl)
			    pstate->wrap2<opencl_equal_operation> ();
			  else
			    pstate->wrap2<equal_operation> ();
			}
	;

exp	:	exp NOTEQUAL exp
			{
			  if (pstate->language ()->la_language
			      == language_opencl)
			    pstate->wrap2<opencl_notequal_operation> ();
			  else
			    pstate->wrap2<notequal_operation> ();
			}
	;

exp	:	exp LEQ exp
			{
			  if (pstate->language ()->la_language
			      == language_opencl)
			    pstate->wrap2<opencl_leq_operation> ();
			  else
			    pstate->wrap2<leq_operation> ();
			}
	;

exp	:	exp GEQ exp
			{
			  if (pstate->language ()->la_language
			      == language_opencl)
			    pstate->wrap2<opencl_geq_operation> ();
			  else
			    pstate->wrap2<geq_operation> ();
			}
	;

exp	:	exp '<' exp
			{
			  if (pstate->language ()->la_language
			      == language_opencl)
			    pstate->wrap2<opencl_less_operation> ();
			  else
			    pstate->wrap2<less_operation> ();
			}
	;

exp	:	exp '>' exp
			{
			  if (pstate->language ()->la_language
			      == language_opencl)
			    pstate->wrap2<opencl_gtr_operation> ();
			  else
			    pstate->wrap2<gtr_operation> ();
			}
	;

exp	:	exp '&' exp
			{ pstate->wrap2<bitwise_and_operation> (); }
	;

exp	:	exp '^' exp
			{ pstate->wrap2<bitwise_xor_operation> (); }
	;

exp	:	exp '|' exp
			{ pstate->wrap2<bitwise_ior_operation> (); }
	;

exp	:	exp ANDAND exp
			{
			  if (pstate->language ()->la_language
			      == language_opencl)
			    {
			      operation_up rhs = pstate->pop ();
			      operation_up lhs = pstate->pop ();
			      pstate->push_new<opencl_logical_binop_operation>
				(BINOP_LOGICAL_AND, std::move (lhs),
				 std::move (rhs));
			    }
			  else
			    pstate->wrap2<logical_and_operation> ();
			}
	;

exp	:	exp OROR exp
			{
			  if (pstate->language ()->la_language
			      == language_opencl)
			    {
			      operation_up rhs = pstate->pop ();
			      operation_up lhs = pstate->pop ();
			      pstate->push_new<opencl_logical_binop_operation>
				(BINOP_LOGICAL_OR, std::move (lhs),
				 std::move (rhs));
			    }
			  else
			    pstate->wrap2<logical_or_operation> ();
			}
	;

exp	:	exp '?' exp ':' exp	%prec '?'
			{
			  operation_up last = pstate->pop ();
			  operation_up mid = pstate->pop ();
			  operation_up first = pstate->pop ();
			  if (pstate->language ()->la_language
			      == language_opencl)
			    pstate->push_new<opencl_ternop_cond_operation>
			      (std::move (first), std::move (mid),
			       std::move (last));
			  else
			    pstate->push_new<ternop_cond_operation>
			      (std::move (first), std::move (mid),
			       std::move (last));
			}
	;

exp	:	exp '=' exp
			{
			  if (pstate->language ()->la_language
			      == language_opencl)
			    pstate->wrap2<opencl_assign_operation> ();
			  else
			    pstate->wrap2<assign_operation> ();
			}
	;

exp	:	exp ASSIGN_MODIFY exp
			{
			  operation_up rhs = pstate->pop ();
			  operation_up lhs = pstate->pop ();
			  pstate->push_new<assign_modify_operation>
			    ($2, std::move (lhs), std::move (rhs));
			}
	;

exp	:	INT
			{
			  pstate->push_new<long_const_operation>
			    ($1.type, $1.val);
			}
	;

exp	:	COMPLEX_INT
			{
			  operation_up real
			    = (make_operation<long_const_operation>
			       ($1.type->target_type (), 0));
			  operation_up imag
			    = (make_operation<long_const_operation>
			       ($1.type->target_type (), $1.val));
			  pstate->push_new<complex_operation>
			    (std::move (real), std::move (imag), $1.type);
			}
	;

exp	:	CHAR
			{
			  struct stoken_vector vec;
			  vec.len = 1;
			  vec.tokens = &$1;
			  pstate->push_c_string ($1.type, &vec);
			}
	;

exp	:	NAME_OR_INT
			{ YYSTYPE val;
			  parse_number (pstate, $1.stoken.ptr,
					$1.stoken.length, 0, &val);
			  pstate->push_new<long_const_operation>
			    (val.typed_val_int.type,
			     val.typed_val_int.val);
			}
	;


exp	:	FLOAT
			{
			  float_data data;
			  std::copy (std::begin ($1.val), std::end ($1.val),
				     std::begin (data));
			  pstate->push_new<float_const_operation> ($1.type, data);
			}
	;

exp	:	COMPLEX_FLOAT
			{
			  struct type *underlying = $1.type->target_type ();

			  float_data val;
			  target_float_from_host_double (val.data (),
							 underlying, 0);
			  operation_up real
			    = (make_operation<float_const_operation>
			       (underlying, val));

			  std::copy (std::begin ($1.val), std::end ($1.val),
				     std::begin (val));
			  operation_up imag
			    = (make_operation<float_const_operation>
			       (underlying, val));

			  pstate->push_new<complex_operation>
			    (std::move (real), std::move (imag),
			     $1.type);
			}
	;

exp	:	variable
	;

exp	:	DOLLAR_VARIABLE
			{
			  pstate->push_dollar ($1);
			}
	;

exp	:	SELECTOR '(' name ')'
			{
			  pstate->push_new<objc_selector_operation>
			    (copy_name ($3));
			}
	;

exp	:	SIZEOF '(' type ')'	%prec UNARY
			{ struct type *type = $3;
			  struct type *int_type
			    = lookup_signed_typename (pstate->language (),
						      "int");
			  type = check_typedef (type);

			    /* $5.3.3/2 of the C++ Standard (n3290 draft)
			       says of sizeof:  "When applied to a reference
			       or a reference type, the result is the size of
			       the referenced type."  */
			  if (TYPE_IS_REFERENCE (type))
			    type = check_typedef (type->target_type ());

			  pstate->push_new<long_const_operation>
			    (int_type, type->length ());
			}
	;

exp	:	REINTERPRET_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
			{ pstate->wrap2<reinterpret_cast_operation> (); }
	;

exp	:	STATIC_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
			{ pstate->wrap2<unop_cast_type_operation> (); }
	;

exp	:	DYNAMIC_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
			{ pstate->wrap2<dynamic_cast_operation> (); }
	;

exp	:	CONST_CAST '<' type_exp '>' '(' exp ')' %prec UNARY
			{ /* We could do more error checking here, but
			     it doesn't seem worthwhile.  */
			  pstate->wrap2<unop_cast_type_operation> (); }
	;

string_exp:
		STRING
			{
			  /* We copy the string here, and not in the
			     lexer, to guarantee that we do not leak a
			     string.  Note that we follow the
			     NUL-termination convention of the
			     lexer.  */
			  struct typed_stoken *vec = XNEW (struct typed_stoken);
			  $$.len = 1;
			  $$.tokens = vec;

			  vec->type = $1.type;
			  vec->length = $1.length;
			  vec->ptr = (char *) malloc ($1.length + 1);
			  memcpy (vec->ptr, $1.ptr, $1.length + 1);
			}

	|	string_exp STRING
			{
			  /* Note that we NUL-terminate here, but just
			     for convenience.  */
			  char *p;
			  ++$$.len;
			  $$.tokens = XRESIZEVEC (struct typed_stoken,
						  $$.tokens, $$.len);

			  p = (char *) malloc ($2.length + 1);
			  memcpy (p, $2.ptr, $2.length + 1);

			  $$.tokens[$$.len - 1].type = $2.type;
			  $$.tokens[$$.len - 1].length = $2.length;
			  $$.tokens[$$.len - 1].ptr = p;
			}
		;

exp	:	string_exp
			{
			  int i;
			  c_string_type type = C_STRING;

			  for (i = 0; i < $1.len; ++i)
			    {
			      switch ($1.tokens[i].type)
				{
				case C_STRING:
				  break;
				case C_WIDE_STRING:
				case C_STRING_16:
				case C_STRING_32:
				  if (type != C_STRING
				      && type != $1.tokens[i].type)
				    error (_("Undefined string concatenation."));
				  type = (enum c_string_type_values) $1.tokens[i].type;
				  break;
				default:
				  /* internal error */
				  internal_error ("unrecognized type in string concatenation");
				}
			    }

			  pstate->push_c_string (type, &$1);
			  for (i = 0; i < $1.len; ++i)
			    free ($1.tokens[i].ptr);
			  free ($1.tokens);
			}
	;

exp     :	NSSTRING	/* ObjC NextStep NSString constant
				 * of the form '@' '"' string '"'.
				 */
			{
			  pstate->push_new<objc_nsstring_operation>
			    (copy_name ($1));
			}
	;

/* C++.  */
exp     :       TRUEKEYWORD
			{ pstate->push_new<long_const_operation>
			    (parse_type (pstate)->builtin_bool, 1);
			}
	;

exp     :       FALSEKEYWORD
			{ pstate->push_new<long_const_operation>
			    (parse_type (pstate)->builtin_bool, 0);
			}
	;

/* end of C++.  */

block	:	BLOCKNAME
			{
			  if ($1.sym.symbol)
			    $$ = $1.sym.symbol->value_block ();
			  else
			    error (_("No file or function \"%s\"."),
				   copy_name ($1.stoken).c_str ());
			}
	|	FILENAME
			{
			  $$ = $1;
			}
	;

block	:	block COLONCOLON name
			{
			  std::string copy = copy_name ($3);
			  struct symbol *tem
			    = lookup_symbol (copy.c_str (), $1,
					     SEARCH_FUNCTION_DOMAIN,
					     nullptr).symbol;

			  if (tem == nullptr)
			    error (_("No function \"%s\" in specified context."),
				   copy.c_str ());
			  $$ = tem->value_block (); }
	;

variable:	name_not_typename ENTRY
			{ struct symbol *sym = $1.sym.symbol;

			  if (sym == NULL || !sym->is_argument ()
			      || !symbol_read_needs_frame (sym))
			    error (_("@entry can be used only for function "
				     "parameters, not for \"%s\""),
				   copy_name ($1.stoken).c_str ());

			  pstate->push_new<var_entry_value_operation> (sym);
			}
	;

variable:	block COLONCOLON name
			{
			  std::string copy = copy_name ($3);
			  struct block_symbol sym
			    = lookup_symbol (copy.c_str (), $1,
					     SEARCH_VFT, NULL);

			  if (sym.symbol == 0)
			    error (_("No symbol \"%s\" in specified context."),
				   copy.c_str ());
			  if (symbol_read_needs_frame (sym.symbol))
			    pstate->block_tracker->update (sym);

			  pstate->push_new<var_value_operation> (sym);
			}
	;

qualified_name:	TYPENAME COLONCOLON name
			{
			  struct type *type = $1.type;
			  type = check_typedef (type);
			  if (!type_aggregate_p (type))
			    error (_("`%s' is not defined as an aggregate type."),
				   TYPE_SAFE_NAME (type));

			  pstate->push_new<scope_operation> (type,
							     copy_name ($3));
			}
	|	TYPENAME COLONCOLON '~' name
			{
			  struct type *type = $1.type;

			  type = check_typedef (type);
			  if (!type_aggregate_p (type))
			    error (_("`%s' is not defined as an aggregate type."),
				   TYPE_SAFE_NAME (type));
			  std::string name = "~" + std::string ($4.ptr,
								$4.length);

			  /* Check for valid destructor name.  */
			  destructor_name_p (name.c_str (), $1.type);
			  pstate->push_new<scope_operation> (type,
							     std::move (name));
			}
	|	TYPENAME COLONCOLON name COLONCOLON name
			{
			  std::string copy = copy_name ($3);
			  error (_("No type \"%s\" within class "
				   "or namespace \"%s\"."),
				 copy.c_str (), TYPE_SAFE_NAME ($1.type));
			}
	;

variable:	qualified_name
	|	COLONCOLON name_not_typename
			{
			  std::string name = copy_name ($2.stoken);
			  struct block_symbol sym
			    = lookup_symbol (name.c_str (),
					     (const struct block *) NULL,
					     SEARCH_VFT, NULL);
			  pstate->push_symbol (name.c_str (), sym);
			}
	;

variable:	name_not_typename
			{ struct block_symbol sym = $1.sym;

			  if (sym.symbol)
			    {
			      if (symbol_read_needs_frame (sym.symbol))
				pstate->block_tracker->update (sym);

			      /* If we found a function, see if it's
				 an ifunc resolver that has the same
				 address as the ifunc symbol itself.
				 If so, prefer the ifunc symbol.  */

			      bound_minimal_symbol resolver
				= find_gnu_ifunc (sym.symbol);
			      if (resolver.minsym != NULL)
				pstate->push_new<var_msym_value_operation>
				  (resolver);
			      else
				pstate->push_new<var_value_operation> (sym);
			    }
			  else if ($1.is_a_field_of_this)
			    {
			      /* C++: it hangs off of `this'.  Must
				 not inadvertently convert from a method call
				 to data ref.  */
			      pstate->block_tracker->update (sym);
			      operation_up thisop
				= make_operation<op_this_operation> ();
			      pstate->push_new<structop_ptr_operation>
				(std::move (thisop), copy_name ($1.stoken));
			    }
			  else
			    {
			      std::string arg = copy_name ($1.stoken);

			      bound_minimal_symbol msymbol
				= lookup_bound_minimal_symbol (arg.c_str ());
			      if (msymbol.minsym == NULL)
				{
				  if (!have_full_symbols () && !have_partial_symbols ())
				    error (_("No symbol table is loaded.  Use the \"file\" command."));
				  else
				    error (_("No symbol \"%s\" in current context."),
					   arg.c_str ());
				}

			      /* This minsym might be an alias for
				 another function.  See if we can find
				 the debug symbol for the target, and
				 if so, use it instead, since it has
				 return type / prototype info.  This
				 is important for example for "p
				 *__errno_location()".  */
			      symbol *alias_target
				= ((msymbol.minsym->type () != mst_text_gnu_ifunc
				    && msymbol.minsym->type () != mst_data_gnu_ifunc)
				   ? find_function_alias_target (msymbol)
				   : NULL);
			      if (alias_target != NULL)
				{
				  block_symbol bsym { alias_target,
				    alias_target->value_block () };
				  pstate->push_new<var_value_operation> (bsym);
				}
			      else
				pstate->push_new<var_msym_value_operation>
				  (msymbol);
			    }
			}
	;

const_or_volatile: const_or_volatile_noopt
	|
	;

single_qualifier:
		CONST_KEYWORD
			{ cpstate->type_stack.insert (tp_const); }
	| 	VOLATILE_KEYWORD
			{ cpstate->type_stack.insert (tp_volatile); }
	| 	ATOMIC
			{ cpstate->type_stack.insert (tp_atomic); }
	| 	RESTRICT
			{ cpstate->type_stack.insert (tp_restrict); }
	|	'@' NAME
		{
		  cpstate->type_stack.insert (pstate,
					      copy_name ($2.stoken).c_str ());
		}
	|	'@' UNKNOWN_CPP_NAME
		{
		  cpstate->type_stack.insert (pstate,
					      copy_name ($2.stoken).c_str ());
		}
	;

qualifier_seq_noopt:
		single_qualifier
	| 	qualifier_seq_noopt single_qualifier
	;

qualifier_seq:
		qualifier_seq_noopt
	|
	;

ptr_operator:
		ptr_operator '*'
			{ cpstate->type_stack.insert (tp_pointer); }
		qualifier_seq
	|	'*'
			{ cpstate->type_stack.insert (tp_pointer); }
		qualifier_seq
	|	'&'
			{ cpstate->type_stack.insert (tp_reference); }
	|	'&' ptr_operator
			{ cpstate->type_stack.insert (tp_reference); }
	|       ANDAND
			{ cpstate->type_stack.insert (tp_rvalue_reference); }
	|       ANDAND ptr_operator
			{ cpstate->type_stack.insert (tp_rvalue_reference); }
	;

ptr_operator_ts: ptr_operator
			{
			  $$ = cpstate->type_stack.create ();
			  cpstate->type_stacks.emplace_back ($$);
			}
	;

abs_decl:	ptr_operator_ts direct_abs_decl
			{ $$ = $2->append ($1); }
	|	ptr_operator_ts
	|	direct_abs_decl
	;

direct_abs_decl: '(' abs_decl ')'
			{ $$ = $2; }
	|	direct_abs_decl array_mod
			{
			  cpstate->type_stack.push ($1);
			  cpstate->type_stack.push ($2);
			  cpstate->type_stack.push (tp_array);
			  $$ = cpstate->type_stack.create ();
			  cpstate->type_stacks.emplace_back ($$);
			}
	|	array_mod
			{
			  cpstate->type_stack.push ($1);
			  cpstate->type_stack.push (tp_array);
			  $$ = cpstate->type_stack.create ();
			  cpstate->type_stacks.emplace_back ($$);
			}

	| 	direct_abs_decl func_mod
			{
			  cpstate->type_stack.push ($1);
			  cpstate->type_stack.push ($2);
			  $$ = cpstate->type_stack.create ();
			  cpstate->type_stacks.emplace_back ($$);
			}
	|	func_mod
			{
			  cpstate->type_stack.push ($1);
			  $$ = cpstate->type_stack.create ();
			  cpstate->type_stacks.emplace_back ($$);
			}
	;

array_mod:	'[' ']'
			{ $$ = -1; }
	|	OBJC_LBRAC ']'
			{ $$ = -1; }
	|	'[' INT ']'
			{ $$ = $2.val; }
	|	OBJC_LBRAC INT ']'
			{ $$ = $2.val; }
	;

func_mod:	'(' ')'
			{
			  $$ = new std::vector<struct type *>;
			  cpstate->type_lists.emplace_back ($$);
			}
	|	'(' parameter_typelist ')'
			{ $$ = $2; }
	;

/* We used to try to recognize pointer to member types here, but
   that didn't work (shift/reduce conflicts meant that these rules never
   got executed).  The problem is that
     int (foo::bar::baz::bizzle)
   is a function type but
     int (foo::bar::baz::bizzle::*)
   is a pointer to member type.  Stroustrup loses again!  */

type	:	ptype
	;

/* A helper production that recognizes scalar types that can validly
   be used with _Complex.  */

scalar_type:
		INT_KEYWORD
			{ $$ = lookup_signed_typename (pstate->language (),
						       "int"); }
	|	LONG
			{ $$ = lookup_signed_typename (pstate->language (),
						       "long"); }
	|	SHORT
			{ $$ = lookup_signed_typename (pstate->language (),
						       "short"); }
	|	LONG INT_KEYWORD
			{ $$ = lookup_signed_typename (pstate->language (),
						       "long"); }
	|	LONG SIGNED_KEYWORD INT_KEYWORD
			{ $$ = lookup_signed_typename (pstate->language (),
						       "long"); }
	|	LONG SIGNED_KEYWORD
			{ $$ = lookup_signed_typename (pstate->language (),
						       "long"); }
	|	SIGNED_KEYWORD LONG INT_KEYWORD
			{ $$ = lookup_signed_typename (pstate->language (),
						       "long"); }
	|	UNSIGNED LONG INT_KEYWORD
			{ $$ = lookup_unsigned_typename (pstate->language (),
							 "long"); }
	|	LONG UNSIGNED INT_KEYWORD
			{ $$ = lookup_unsigned_typename (pstate->language (),
							 "long"); }
	|	LONG UNSIGNED
			{ $$ = lookup_unsigned_typename (pstate->language (),
							 "long"); }
	|	LONG LONG
			{ $$ = lookup_signed_typename (pstate->language (),
						       "long long"); }
	|	LONG LONG INT_KEYWORD
			{ $$ = lookup_signed_typename (pstate->language (),
						       "long long"); }
	|	LONG LONG SIGNED_KEYWORD INT_KEYWORD
			{ $$ = lookup_signed_typename (pstate->language (),
						       "long long"); }
	|	LONG LONG SIGNED_KEYWORD
			{ $$ = lookup_signed_typename (pstate->language (),
						       "long long"); }
	|	SIGNED_KEYWORD LONG LONG
			{ $$ = lookup_signed_typename (pstate->language (),
						       "long long"); }
	|	SIGNED_KEYWORD LONG LONG INT_KEYWORD
			{ $$ = lookup_signed_typename (pstate->language (),
						       "long long"); }
	|	UNSIGNED LONG LONG
			{ $$ = lookup_unsigned_typename (pstate->language (),
							 "long long"); }
	|	UNSIGNED LONG LONG INT_KEYWORD
			{ $$ = lookup_unsigned_typename (pstate->language (),
							 "long long"); }
	|	LONG LONG UNSIGNED
			{ $$ = lookup_unsigned_typename (pstate->language (),
							 "long long"); }
	|	LONG LONG UNSIGNED INT_KEYWORD
			{ $$ = lookup_unsigned_typename (pstate->language (),
							 "long long"); }
	|	SHORT INT_KEYWORD
			{ $$ = lookup_signed_typename (pstate->language (),
						       "short"); }
	|	SHORT SIGNED_KEYWORD INT_KEYWORD
			{ $$ = lookup_signed_typename (pstate->language (),
						       "short"); }
	|	SHORT SIGNED_KEYWORD
			{ $$ = lookup_signed_typename (pstate->language (),
						       "short"); }
	|	UNSIGNED SHORT INT_KEYWORD
			{ $$ = lookup_unsigned_typename (pstate->language (),
							 "short"); }
	|	SHORT UNSIGNED
			{ $$ = lookup_unsigned_typename (pstate->language (),
							 "short"); }
	|	SHORT UNSIGNED INT_KEYWORD
			{ $$ = lookup_unsigned_typename (pstate->language (),
							 "short"); }
	|	DOUBLE_KEYWORD
			{ $$ = lookup_typename (pstate->language (),
						"double",
						NULL,
						0); }
	|	FLOAT_KEYWORD
			{ $$ = lookup_typename (pstate->language (),
						"float",
						NULL,
						0); }
	|	LONG DOUBLE_KEYWORD
			{ $$ = lookup_typename (pstate->language (),
						"long double",
						NULL,
						0); }
	|	UNSIGNED type_name
			{ $$ = lookup_unsigned_typename (pstate->language (),
							 $2.type->name ()); }
	|	UNSIGNED
			{ $$ = lookup_unsigned_typename (pstate->language (),
							 "int"); }
	|	SIGNED_KEYWORD type_name
			{ $$ = lookup_signed_typename (pstate->language (),
						       $2.type->name ()); }
	|	SIGNED_KEYWORD
			{ $$ = lookup_signed_typename (pstate->language (),
						       "int"); }
	;

/* Implements (approximately): (type-qualifier)* type-specifier.

   When type-specifier is only ever a single word, like 'float' then these
   arrive as pre-built TYPENAME tokens thanks to the classify_name
   function.  However, when a type-specifier can contain multiple words,
   for example 'double' can appear as just 'double' or 'long double', and
   similarly 'long' can appear as just 'long' or in 'long double', then
   these type-specifiers are parsed into their own tokens in the function
   lex_one_token and the ident_tokens array.  These separate tokens are all
   recognised here.  */
typebase
	:	TYPENAME
			{ $$ = $1.type; }
	|	scalar_type
			{ $$ = $1; }
	|	COMPLEX scalar_type
			{
			  $$ = init_complex_type (nullptr, $2);
			}
	|	STRUCT name
			{ $$
			    = lookup_struct (copy_name ($2).c_str (),
					     pstate->expression_context_block);
			}
	|	STRUCT COMPLETE
			{
			  pstate->mark_completion_tag (TYPE_CODE_STRUCT,
						       "", 0);
			  $$ = NULL;
			}
	|	STRUCT name COMPLETE
			{
			  pstate->mark_completion_tag (TYPE_CODE_STRUCT,
						       $2.ptr, $2.length);
			  $$ = NULL;
			}
	|	CLASS name
			{ $$ = lookup_struct
			    (copy_name ($2).c_str (),
			     pstate->expression_context_block);
			}
	|	CLASS COMPLETE
			{
			  pstate->mark_completion_tag (TYPE_CODE_STRUCT,
						       "", 0);
			  $$ = NULL;
			}
	|	CLASS name COMPLETE
			{
			  pstate->mark_completion_tag (TYPE_CODE_STRUCT,
						       $2.ptr, $2.length);
			  $$ = NULL;
			}
	|	UNION name
			{ $$
			    = lookup_union (copy_name ($2).c_str (),
					    pstate->expression_context_block);
			}
	|	UNION COMPLETE
			{
			  pstate->mark_completion_tag (TYPE_CODE_UNION,
						       "", 0);
			  $$ = NULL;
			}
	|	UNION name COMPLETE
			{
			  pstate->mark_completion_tag (TYPE_CODE_UNION,
						       $2.ptr, $2.length);
			  $$ = NULL;
			}
	|	ENUM name
			{ $$ = lookup_enum (copy_name ($2).c_str (),
					    pstate->expression_context_block);
			}
	|	ENUM COMPLETE
			{
			  pstate->mark_completion_tag (TYPE_CODE_ENUM, "", 0);
			  $$ = NULL;
			}
	|	ENUM name COMPLETE
			{
			  pstate->mark_completion_tag (TYPE_CODE_ENUM, $2.ptr,
						       $2.length);
			  $$ = NULL;
			}
		/* It appears that this rule for templates is never
		   reduced; template recognition happens by lookahead
		   in the token processing code in yylex. */
	|	TEMPLATE name '<' type '>'
			{ $$ = lookup_template_type
			    (copy_name($2).c_str (), $4,
			     pstate->expression_context_block);
			}
	|	qualifier_seq_noopt typebase
			{ $$ = cpstate->type_stack.follow_types ($2); }
	|	typebase qualifier_seq_noopt
			{ $$ = cpstate->type_stack.follow_types ($1); }
	;

type_name:	TYPENAME
	|	INT_KEYWORD
		{
		  $$.stoken.ptr = "int";
		  $$.stoken.length = 3;
		  $$.type = lookup_signed_typename (pstate->language (),
						    "int");
		}
	|	LONG
		{
		  $$.stoken.ptr = "long";
		  $$.stoken.length = 4;
		  $$.type = lookup_signed_typename (pstate->language (),
						    "long");
		}
	|	SHORT
		{
		  $$.stoken.ptr = "short";
		  $$.stoken.length = 5;
		  $$.type = lookup_signed_typename (pstate->language (),
						    "short");
		}
	;

parameter_typelist:
		nonempty_typelist
			{ check_parameter_typelist ($1); }
	|	nonempty_typelist ',' DOTDOTDOT
			{
			  $1->push_back (NULL);
			  check_parameter_typelist ($1);
			  $$ = $1;
			}
	;

nonempty_typelist
	:	type
		{
		  std::vector<struct type *> *typelist
		    = new std::vector<struct type *>;
		  cpstate->type_lists.emplace_back (typelist);

		  typelist->push_back ($1);
		  $$ = typelist;
		}
	|	nonempty_typelist ',' type
		{
		  $1->push_back ($3);
		  $$ = $1;
		}
	;

ptype	:	typebase
	|	ptype abs_decl
		{
		  cpstate->type_stack.push ($2);
		  $$ = cpstate->type_stack.follow_types ($1);
		}
	;

conversion_type_id: typebase conversion_declarator
		{ $$ = cpstate->type_stack.follow_types ($1); }
	;

conversion_declarator:  /* Nothing.  */
	| ptr_operator conversion_declarator
	;

const_and_volatile: 	CONST_KEYWORD VOLATILE_KEYWORD
	| 		VOLATILE_KEYWORD CONST_KEYWORD
	;

const_or_volatile_noopt:  	const_and_volatile
			{ cpstate->type_stack.insert (tp_const);
			  cpstate->type_stack.insert (tp_volatile);
			}
	| 		CONST_KEYWORD
			{ cpstate->type_stack.insert (tp_const); }
	| 		VOLATILE_KEYWORD
			{ cpstate->type_stack.insert (tp_volatile); }
	;

oper:	OPERATOR NEW
			{ $$ = operator_stoken (" new"); }
	|	OPERATOR DELETE
			{ $$ = operator_stoken (" delete"); }
	|	OPERATOR NEW '[' ']'
			{ $$ = operator_stoken (" new[]"); }
	|	OPERATOR DELETE '[' ']'
			{ $$ = operator_stoken (" delete[]"); }
	|	OPERATOR NEW OBJC_LBRAC ']'
			{ $$ = operator_stoken (" new[]"); }
	|	OPERATOR DELETE OBJC_LBRAC ']'
			{ $$ = operator_stoken (" delete[]"); }
	|	OPERATOR '+'
			{ $$ = operator_stoken ("+"); }
	|	OPERATOR '-'
			{ $$ = operator_stoken ("-"); }
	|	OPERATOR '*'
			{ $$ = operator_stoken ("*"); }
	|	OPERATOR '/'
			{ $$ = operator_stoken ("/"); }
	|	OPERATOR '%'
			{ $$ = operator_stoken ("%"); }
	|	OPERATOR '^'
			{ $$ = operator_stoken ("^"); }
	|	OPERATOR '&'
			{ $$ = operator_stoken ("&"); }
	|	OPERATOR '|'
			{ $$ = operator_stoken ("|"); }
	|	OPERATOR '~'
			{ $$ = operator_stoken ("~"); }
	|	OPERATOR '!'
			{ $$ = operator_stoken ("!"); }
	|	OPERATOR '='
			{ $$ = operator_stoken ("="); }
	|	OPERATOR '<'
			{ $$ = operator_stoken ("<"); }
	|	OPERATOR '>'
			{ $$ = operator_stoken (">"); }
	|	OPERATOR ASSIGN_MODIFY
			{ const char *op = " unknown";
			  switch ($2)
			    {
			    case BINOP_RSH:
			      op = ">>=";
			      break;
			    case BINOP_LSH:
			      op = "<<=";
			      break;
			    case BINOP_ADD:
			      op = "+=";
			      break;
			    case BINOP_SUB:
			      op = "-=";
			      break;
			    case BINOP_MUL:
			      op = "*=";
			      break;
			    case BINOP_DIV:
			      op = "/=";
			      break;
			    case BINOP_REM:
			      op = "%=";
			      break;
			    case BINOP_BITWISE_IOR:
			      op = "|=";
			      break;
			    case BINOP_BITWISE_AND:
			      op = "&=";
			      break;
			    case BINOP_BITWISE_XOR:
			      op = "^=";
			      break;
			    default:
			      break;
			    }

			  $$ = operator_stoken (op);
			}
	|	OPERATOR LSH
			{ $$ = operator_stoken ("<<"); }
	|	OPERATOR RSH
			{ $$ = operator_stoken (">>"); }
	|	OPERATOR EQUAL
			{ $$ = operator_stoken ("=="); }
	|	OPERATOR NOTEQUAL
			{ $$ = operator_stoken ("!="); }
	|	OPERATOR LEQ
			{ $$ = operator_stoken ("<="); }
	|	OPERATOR GEQ
			{ $$ = operator_stoken (">="); }
	|	OPERATOR ANDAND
			{ $$ = operator_stoken ("&&"); }
	|	OPERATOR OROR
			{ $$ = operator_stoken ("||"); }
	|	OPERATOR INCREMENT
			{ $$ = operator_stoken ("++"); }
	|	OPERATOR DECREMENT
			{ $$ = operator_stoken ("--"); }
	|	OPERATOR ','
			{ $$ = operator_stoken (","); }
	|	OPERATOR ARROW_STAR
			{ $$ = operator_stoken ("->*"); }
	|	OPERATOR ARROW
			{ $$ = operator_stoken ("->"); }
	|	OPERATOR '(' ')'
			{ $$ = operator_stoken ("()"); }
	|	OPERATOR '[' ']'
			{ $$ = operator_stoken ("[]"); }
	|	OPERATOR OBJC_LBRAC ']'
			{ $$ = operator_stoken ("[]"); }
	|	OPERATOR conversion_type_id
			{
			  string_file buf;
			  c_print_type ($2, NULL, &buf, -1, 0,
					pstate->language ()->la_language,
					&type_print_raw_options);
			  std::string name = buf.release ();

			  /* This also needs canonicalization.  */
			  gdb::unique_xmalloc_ptr<char> canon
			    = cp_canonicalize_string (name.c_str ());
			  if (canon != nullptr)
			    name = canon.get ();
			  $$ = operator_stoken ((" " + name).c_str ());
			}
	;

/* This rule exists in order to allow some tokens that would not normally
   match the 'name' rule to appear as fields within a struct.  The example
   that initially motivated this was the RISC-V target which models the
   floating point registers as a union with fields called 'float' and
   'double'.  */
field_name
	:	name
	|	DOUBLE_KEYWORD { $$ = typename_stoken ("double"); }
	|	FLOAT_KEYWORD { $$ = typename_stoken ("float"); }
	|	INT_KEYWORD { $$ = typename_stoken ("int"); }
	|	LONG { $$ = typename_stoken ("long"); }
	|	SHORT { $$ = typename_stoken ("short"); }
	|	SIGNED_KEYWORD { $$ = typename_stoken ("signed"); }
	|	UNSIGNED { $$ = typename_stoken ("unsigned"); }
	;

name	:	NAME { $$ = $1.stoken; }
	|	BLOCKNAME { $$ = $1.stoken; }
	|	TYPENAME { $$ = $1.stoken; }
	|	NAME_OR_INT  { $$ = $1.stoken; }
	|	UNKNOWN_CPP_NAME  { $$ = $1.stoken; }
	|	oper { $$ = $1; }
	;

name_not_typename :	NAME
	|	BLOCKNAME
/* These would be useful if name_not_typename was useful, but it is just
   a fake for "variable", so these cause reduce/reduce conflicts because
   the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
   =exp) or just an exp.  If name_not_typename was ever used in an lvalue
   context where only a name could occur, this might be useful.
  	|	NAME_OR_INT
 */
	|	oper
			{
			  struct field_of_this_result is_a_field_of_this;

			  $$.stoken = $1;
			  $$.sym
			    = lookup_symbol ($1.ptr,
					     pstate->expression_context_block,
					     SEARCH_VFT,
					     &is_a_field_of_this);
			  $$.is_a_field_of_this
			    = is_a_field_of_this.type != NULL;
			}
	|	UNKNOWN_CPP_NAME
	;

%%

/* Returns a stoken of the operator name given by OP (which does not
   include the string "operator").  */

static struct stoken
operator_stoken (const char *op)
{
  struct stoken st = { NULL, 0 };
  char *buf;

  st.length = CP_OPERATOR_LEN + strlen (op);
  buf = (char *) malloc (st.length + 1);
  strcpy (buf, CP_OPERATOR_STR);
  strcat (buf, op);
  st.ptr = buf;

  /* The toplevel (c_parse) will free the memory allocated here.  */
  cpstate->strings.emplace_back (buf);
  return st;
};

/* Returns a stoken of the type named TYPE.  */

static struct stoken
typename_stoken (const char *type)
{
  struct stoken st = { type, 0 };
  st.length = strlen (type);
  return st;
};

/* Return true if the type is aggregate-like.  */

static int
type_aggregate_p (struct type *type)
{
  return (type->code () == TYPE_CODE_STRUCT
	  || type->code () == TYPE_CODE_UNION
	  || type->code () == TYPE_CODE_NAMESPACE
	  || (type->code () == TYPE_CODE_ENUM
	      && type->is_declared_class ()));
}

/* Validate a parameter typelist.  */

static void
check_parameter_typelist (std::vector<struct type *> *params)
{
  struct type *type;
  int ix;

  for (ix = 0; ix < params->size (); ++ix)
    {
      type = (*params)[ix];
      if (type != NULL && check_typedef (type)->code () == TYPE_CODE_VOID)
	{
	  if (ix == 0)
	    {
	      if (params->size () == 1)
		{
		  /* Ok.  */
		  break;
		}
	      error (_("parameter types following 'void'"));
	    }
	  else
	    error (_("'void' invalid as parameter type"));
	}
    }
}

/* Take care of parsing a number (anything that starts with a digit).
   Set yylval and return the token type; update lexptr.
   LEN is the number of characters in it.  */

/*** Needs some error checking for the float case ***/

static int
parse_number (struct parser_state *par_state,
	      const char *buf, int len, int parsed_float, YYSTYPE *putithere)
{
  ULONGEST n = 0;
  ULONGEST prevn = 0;

  int i = 0;
  int c;
  int base = input_radix;
  int unsigned_p = 0;

  /* Number of "L" suffixes encountered.  */
  int long_p = 0;

  /* Imaginary number.  */
  bool imaginary_p = false;

  /* We have found a "L" or "U" (or "i") suffix.  */
  int found_suffix = 0;

  char *p;

  p = (char *) alloca (len);
  memcpy (p, buf, len);

  if (parsed_float)
    {
      if (len >= 1 && p[len - 1] == 'i')
	{
	  imaginary_p = true;
	  --len;
	}

      /* Handle suffixes for decimal floating-point: "df", "dd" or "dl".  */
      if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'f')
	{
	  putithere->typed_val_float.type
	    = parse_type (par_state)->builtin_decfloat;
	  len -= 2;
	}
      else if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'd')
	{
	  putithere->typed_val_float.type
	    = parse_type (par_state)->builtin_decdouble;
	  len -= 2;
	}
      else if (len >= 2 && p[len - 2] == 'd' && p[len - 1] == 'l')
	{
	  putithere->typed_val_float.type
	    = parse_type (par_state)->builtin_declong;
	  len -= 2;
	}
      /* Handle suffixes: 'f' for float, 'l' for long double.  */
      else if (len >= 1 && TOLOWER (p[len - 1]) == 'f')
	{
	  putithere->typed_val_float.type
	    = parse_type (par_state)->builtin_float;
	  len -= 1;
	}
      else if (len >= 1 && TOLOWER (p[len - 1]) == 'l')
	{
	  putithere->typed_val_float.type
	    = parse_type (par_state)->builtin_long_double;
	  len -= 1;
	}
      /* Default type for floating-point literals is double.  */
      else
	{
	  putithere->typed_val_float.type
	    = parse_type (par_state)->builtin_double;
	}

      if (!parse_float (p, len,
			putithere->typed_val_float.type,
			putithere->typed_val_float.val))
	return ERROR;

      if (imaginary_p)
	putithere->typed_val_float.type
	  = init_complex_type (nullptr, putithere->typed_val_float.type);

      return imaginary_p ? COMPLEX_FLOAT : FLOAT;
    }

  /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
  if (p[0] == '0' && len > 1)
    switch (p[1])
      {
      case 'x':
      case 'X':
	if (len >= 3)
	  {
	    p += 2;
	    base = 16;
	    len -= 2;
	  }
	break;

      case 'b':
      case 'B':
	if (len >= 3)
	  {
	    p += 2;
	    base = 2;
	    len -= 2;
	  }
	break;

      case 't':
      case 'T':
      case 'd':
      case 'D':
	if (len >= 3)
	  {
	    p += 2;
	    base = 10;
	    len -= 2;
	  }
	break;

      default:
	base = 8;
	break;
      }

  while (len-- > 0)
    {
      c = *p++;
      if (c >= 'A' && c <= 'Z')
	c += 'a' - 'A';
      if (c != 'l' && c != 'u' && c != 'i')
	n *= base;
      if (c >= '0' && c <= '9')
	{
	  if (found_suffix)
	    return ERROR;
	  n += i = c - '0';
	}
      else
	{
	  if (base > 10 && c >= 'a' && c <= 'f')
	    {
	      if (found_suffix)
		return ERROR;
	      n += i = c - 'a' + 10;
	    }
	  else if (c == 'l')
	    {
	      ++long_p;
	      found_suffix = 1;
	    }
	  else if (c == 'u')
	    {
	      unsigned_p = 1;
	      found_suffix = 1;
	    }
	  else if (c == 'i')
	    {
	      imaginary_p = true;
	      found_suffix = 1;
	    }
	  else
	    return ERROR;	/* Char not a digit */
	}
      if (i >= base)
	return ERROR;		/* Invalid digit in this base */

      if (c != 'l' && c != 'u' && c != 'i')
	{
	  /* Test for overflow.  */
	  if (prevn == 0 && n == 0)
	    ;
	  else if (prevn >= n)
	    error (_("Numeric constant too large."));
	}
      prevn = n;
    }

  /* An integer constant is an int, a long, or a long long.  An L
     suffix forces it to be long; an LL suffix forces it to be long
     long.  If not forced to a larger size, it gets the first type of
     the above that it fits in.  To figure out whether it fits, we
     shift it right and see whether anything remains.  Note that we
     can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
     operation, because many compilers will warn about such a shift
     (which always produces a zero result).  Sometimes gdbarch_int_bit
     or gdbarch_long_bit will be that big, sometimes not.  To deal with
     the case where it is we just always shift the value more than
     once, with fewer bits each time.  */
  int int_bits = gdbarch_int_bit (par_state->gdbarch ());
  int long_bits = gdbarch_long_bit (par_state->gdbarch ());
  int long_long_bits = gdbarch_long_long_bit (par_state->gdbarch ());
  bool have_signed
    /* No 'u' suffix.  */
    = !unsigned_p;
  bool have_unsigned
    = ((/* 'u' suffix.  */
	unsigned_p)
       || (/* Not a decimal.  */
	   base != 10)
       || (/* Allowed as a convenience, in case decimal doesn't fit in largest
	      signed type.  */
	   !fits_in_type (1, n, long_long_bits, true)));
  bool have_int
    /* No 'l' or 'll' suffix.  */
    = long_p == 0;
  bool have_long
    /* No 'll' suffix.  */
    = long_p <= 1;
  if (have_int && have_signed && fits_in_type (1, n, int_bits, true))
    putithere->typed_val_int.type = parse_type (par_state)->builtin_int;
  else if (have_int && have_unsigned && fits_in_type (1, n, int_bits, false))
    putithere->typed_val_int.type
      = parse_type (par_state)->builtin_unsigned_int;
  else if (have_long && have_signed && fits_in_type (1, n, long_bits, true))
    putithere->typed_val_int.type = parse_type (par_state)->builtin_long;
  else if (have_long && have_unsigned && fits_in_type (1, n, long_bits, false))
    putithere->typed_val_int.type
      = parse_type (par_state)->builtin_unsigned_long;
  else if (have_signed && fits_in_type (1, n, long_long_bits, true))
    putithere->typed_val_int.type
      = parse_type (par_state)->builtin_long_long;
  else if (have_unsigned && fits_in_type (1, n, long_long_bits, false))
    putithere->typed_val_int.type
      = parse_type (par_state)->builtin_unsigned_long_long;
  else
    error (_("Numeric constant too large."));
  putithere->typed_val_int.val = n;

   if (imaginary_p)
     putithere->typed_val_int.type
       = init_complex_type (nullptr, putithere->typed_val_int.type);

   return imaginary_p ? COMPLEX_INT : INT;
}

/* Temporary obstack used for holding strings.  */
static struct obstack tempbuf;
static int tempbuf_init;

/* Parse a C escape sequence.  The initial backslash of the sequence
   is at (*PTR)[-1].  *PTR will be updated to point to just after the
   last character of the sequence.  If OUTPUT is not NULL, the
   translated form of the escape sequence will be written there.  If
   OUTPUT is NULL, no output is written and the call will only affect
   *PTR.  If an escape sequence is expressed in target bytes, then the
   entire sequence will simply be copied to OUTPUT.  Return 1 if any
   character was emitted, 0 otherwise.  */

int
c_parse_escape (const char **ptr, struct obstack *output)
{
  const char *tokptr = *ptr;
  int result = 1;

  /* Some escape sequences undergo character set conversion.  Those we
     translate here.  */
  switch (*tokptr)
    {
      /* Hex escapes do not undergo character set conversion, so keep
	 the escape sequence for later.  */
    case 'x':
      if (output)
	obstack_grow_str (output, "\\x");
      ++tokptr;
      if (!ISXDIGIT (*tokptr))
	error (_("\\x escape without a following hex digit"));
      while (ISXDIGIT (*tokptr))
	{
	  if (output)
	    obstack_1grow (output, *tokptr);
	  ++tokptr;
	}
      break;

      /* Octal escapes do not undergo character set conversion, so
	 keep the escape sequence for later.  */
    case '0':
    case '1':
    case '2':
    case '3':
    case '4':
    case '5':
    case '6':
    case '7':
      {
	int i;
	if (output)
	  obstack_grow_str (output, "\\");
	for (i = 0;
	     i < 3 && ISDIGIT (*tokptr) && *tokptr != '8' && *tokptr != '9';
	     ++i)
	  {
	    if (output)
	      obstack_1grow (output, *tokptr);
	    ++tokptr;
	  }
      }
      break;

      /* We handle UCNs later.  We could handle them here, but that
	 would mean a spurious error in the case where the UCN could
	 be converted to the target charset but not the host
	 charset.  */
    case 'u':
    case 'U':
      {
	char c = *tokptr;
	int i, len = c == 'U' ? 8 : 4;
	if (output)
	  {
	    obstack_1grow (output, '\\');
	    obstack_1grow (output, *tokptr);
	  }
	++tokptr;
	if (!ISXDIGIT (*tokptr))
	  error (_("\\%c escape without a following hex digit"), c);
	for (i = 0; i < len && ISXDIGIT (*tokptr); ++i)
	  {
	    if (output)
	      obstack_1grow (output, *tokptr);
	    ++tokptr;
	  }
      }
      break;

      /* We must pass backslash through so that it does not
	 cause quoting during the second expansion.  */
    case '\\':
      if (output)
	obstack_grow_str (output, "\\\\");
      ++tokptr;
      break;

      /* Escapes which undergo conversion.  */
    case 'a':
      if (output)
	obstack_1grow (output, '\a');
      ++tokptr;
      break;
    case 'b':
      if (output)
	obstack_1grow (output, '\b');
      ++tokptr;
      break;
    case 'f':
      if (output)
	obstack_1grow (output, '\f');
      ++tokptr;
      break;
    case 'n':
      if (output)
	obstack_1grow (output, '\n');
      ++tokptr;
      break;
    case 'r':
      if (output)
	obstack_1grow (output, '\r');
      ++tokptr;
      break;
    case 't':
      if (output)
	obstack_1grow (output, '\t');
      ++tokptr;
      break;
    case 'v':
      if (output)
	obstack_1grow (output, '\v');
      ++tokptr;
      break;

      /* GCC extension.  */
    case 'e':
      if (output)
	obstack_1grow (output, HOST_ESCAPE_CHAR);
      ++tokptr;
      break;

      /* Backslash-newline expands to nothing at all.  */
    case '\n':
      ++tokptr;
      result = 0;
      break;

      /* A few escapes just expand to the character itself.  */
    case '\'':
    case '\"':
    case '?':
      /* GCC extensions.  */
    case '(':
    case '{':
    case '[':
    case '%':
      /* Unrecognized escapes turn into the character itself.  */
    default:
      if (output)
	obstack_1grow (output, *tokptr);
      ++tokptr;
      break;
    }
  *ptr = tokptr;
  return result;
}

/* Parse a string or character literal from TOKPTR.  The string or
   character may be wide or unicode.  *OUTPTR is set to just after the
   end of the literal in the input string.  The resulting token is
   stored in VALUE.  This returns a token value, either STRING or
   CHAR, depending on what was parsed.  *HOST_CHARS is set to the
   number of host characters in the literal.  */

static int
parse_string_or_char (const char *tokptr, const char **outptr,
		      struct typed_stoken *value, int *host_chars)
{
  int quote;
  c_string_type type;
  int is_objc = 0;

  /* Build the gdb internal form of the input string in tempbuf.  Note
     that the buffer is null byte terminated *only* for the
     convenience of debugging gdb itself and printing the buffer
     contents when the buffer contains no embedded nulls.  Gdb does
     not depend upon the buffer being null byte terminated, it uses
     the length string instead.  This allows gdb to handle C strings
     (as well as strings in other languages) with embedded null
     bytes */

  if (!tempbuf_init)
    tempbuf_init = 1;
  else
    obstack_free (&tempbuf, NULL);
  obstack_init (&tempbuf);

  /* Record the string type.  */
  if (*tokptr == 'L')
    {
      type = C_WIDE_STRING;
      ++tokptr;
    }
  else if (*tokptr == 'u')
    {
      type = C_STRING_16;
      ++tokptr;
    }
  else if (*tokptr == 'U')
    {
      type = C_STRING_32;
      ++tokptr;
    }
  else if (*tokptr == '@')
    {
      /* An Objective C string.  */
      is_objc = 1;
      type = C_STRING;
      ++tokptr;
    }
  else
    type = C_STRING;

  /* Skip the quote.  */
  quote = *tokptr;
  if (quote == '\'')
    type |= C_CHAR;
  ++tokptr;

  *host_chars = 0;

  while (*tokptr)
    {
      char c = *tokptr;
      if (c == '\\')
	{
	  ++tokptr;
	  *host_chars += c_parse_escape (&tokptr, &tempbuf);
	}
      else if (c == quote)
	break;
      else
	{
	  obstack_1grow (&tempbuf, c);
	  ++tokptr;
	  /* FIXME: this does the wrong thing with multi-byte host
	     characters.  We could use mbrlen here, but that would
	     make "set host-charset" a bit less useful.  */
	  ++*host_chars;
	}
    }

  if (*tokptr != quote)
    {
      if (quote == '"')
	error (_("Unterminated string in expression."));
      else
	error (_("Unmatched single quote."));
    }
  ++tokptr;

  value->type = type;
  value->ptr = (char *) obstack_base (&tempbuf);
  value->length = obstack_object_size (&tempbuf);

  *outptr = tokptr;

  return quote == '"' ? (is_objc ? NSSTRING : STRING) : CHAR;
}

/* This is used to associate some attributes with a token.  */

enum token_flag
{
  /* If this bit is set, the token is C++-only.  */

  FLAG_CXX = 1,

  /* If this bit is set, the token is C-only.  */

  FLAG_C = 2,

  /* If this bit is set, the token is conditional: if there is a
     symbol of the same name, then the token is a symbol; otherwise,
     the token is a keyword.  */

  FLAG_SHADOW = 4
};
DEF_ENUM_FLAGS_TYPE (enum token_flag, token_flags);

struct c_token
{
  const char *oper;
  int token;
  enum exp_opcode opcode;
  token_flags flags;
};

static const struct c_token tokentab3[] =
  {
    {">>=", ASSIGN_MODIFY, BINOP_RSH, 0},
    {"<<=", ASSIGN_MODIFY, BINOP_LSH, 0},
    {"->*", ARROW_STAR, OP_NULL, FLAG_CXX},
    {"...", DOTDOTDOT, OP_NULL, 0}
  };

static const struct c_token tokentab2[] =
  {
    {"+=", ASSIGN_MODIFY, BINOP_ADD, 0},
    {"-=", ASSIGN_MODIFY, BINOP_SUB, 0},
    {"*=", ASSIGN_MODIFY, BINOP_MUL, 0},
    {"/=", ASSIGN_MODIFY, BINOP_DIV, 0},
    {"%=", ASSIGN_MODIFY, BINOP_REM, 0},
    {"|=", ASSIGN_MODIFY, BINOP_BITWISE_IOR, 0},
    {"&=", ASSIGN_MODIFY, BINOP_BITWISE_AND, 0},
    {"^=", ASSIGN_MODIFY, BINOP_BITWISE_XOR, 0},
    {"++", INCREMENT, OP_NULL, 0},
    {"--", DECREMENT, OP_NULL, 0},
    {"->", ARROW, OP_NULL, 0},
    {"&&", ANDAND, OP_NULL, 0},
    {"||", OROR, OP_NULL, 0},
    /* "::" is *not* only C++: gdb overrides its meaning in several
       different ways, e.g., 'filename'::func, function::variable.  */
    {"::", COLONCOLON, OP_NULL, 0},
    {"<<", LSH, OP_NULL, 0},
    {">>", RSH, OP_NULL, 0},
    {"==", EQUAL, OP_NULL, 0},
    {"!=", NOTEQUAL, OP_NULL, 0},
    {"<=", LEQ, OP_NULL, 0},
    {">=", GEQ, OP_NULL, 0},
    {".*", DOT_STAR, OP_NULL, FLAG_CXX}
  };

/* Identifier-like tokens.  Only type-specifiers than can appear in
   multi-word type names (for example 'double' can appear in 'long
   double') need to be listed here.  type-specifiers that are only ever
   single word (like 'char') are handled by the classify_name function.  */
static const struct c_token ident_tokens[] =
  {
    {"unsigned", UNSIGNED, OP_NULL, 0},
    {"template", TEMPLATE, OP_NULL, FLAG_CXX},
    {"volatile", VOLATILE_KEYWORD, OP_NULL, 0},
    {"struct", STRUCT, OP_NULL, 0},
    {"signed", SIGNED_KEYWORD, OP_NULL, 0},
    {"sizeof", SIZEOF, OP_NULL, 0},
    {"_Alignof", ALIGNOF, OP_NULL, 0},
    {"alignof", ALIGNOF, OP_NULL, FLAG_CXX},
    {"double", DOUBLE_KEYWORD, OP_NULL, 0},
    {"float", FLOAT_KEYWORD, OP_NULL, 0},
    {"false", FALSEKEYWORD, OP_NULL, FLAG_CXX},
    {"class", CLASS, OP_NULL, FLAG_CXX},
    {"union", UNION, OP_NULL, 0},
    {"short", SHORT, OP_NULL, 0},
    {"const", CONST_KEYWORD, OP_NULL, 0},
    {"restrict", RESTRICT, OP_NULL, FLAG_C | FLAG_SHADOW},
    {"__restrict__", RESTRICT, OP_NULL, 0},
    {"__restrict", RESTRICT, OP_NULL, 0},
    {"_Atomic", ATOMIC, OP_NULL, 0},
    {"enum", ENUM, OP_NULL, 0},
    {"long", LONG, OP_NULL, 0},
    {"_Complex", COMPLEX, OP_NULL, 0},
    {"__complex__", COMPLEX, OP_NULL, 0},

    {"true", TRUEKEYWORD, OP_NULL, FLAG_CXX},
    {"int", INT_KEYWORD, OP_NULL, 0},
    {"new", NEW, OP_NULL, FLAG_CXX},
    {"delete", DELETE, OP_NULL, FLAG_CXX},
    {"operator", OPERATOR, OP_NULL, FLAG_CXX},

    {"and", ANDAND, OP_NULL, FLAG_CXX},
    {"and_eq", ASSIGN_MODIFY, BINOP_BITWISE_AND, FLAG_CXX},
    {"bitand", '&', OP_NULL, FLAG_CXX},
    {"bitor", '|', OP_NULL, FLAG_CXX},
    {"compl", '~', OP_NULL, FLAG_CXX},
    {"not", '!', OP_NULL, FLAG_CXX},
    {"not_eq", NOTEQUAL, OP_NULL, FLAG_CXX},
    {"or", OROR, OP_NULL, FLAG_CXX},
    {"or_eq", ASSIGN_MODIFY, BINOP_BITWISE_IOR, FLAG_CXX},
    {"xor", '^', OP_NULL, FLAG_CXX},
    {"xor_eq", ASSIGN_MODIFY, BINOP_BITWISE_XOR, FLAG_CXX},

    {"const_cast", CONST_CAST, OP_NULL, FLAG_CXX },
    {"dynamic_cast", DYNAMIC_CAST, OP_NULL, FLAG_CXX },
    {"static_cast", STATIC_CAST, OP_NULL, FLAG_CXX },
    {"reinterpret_cast", REINTERPRET_CAST, OP_NULL, FLAG_CXX },

    {"__typeof__", TYPEOF, OP_TYPEOF, 0 },
    {"__typeof", TYPEOF, OP_TYPEOF, 0 },
    {"typeof", TYPEOF, OP_TYPEOF, FLAG_SHADOW },
    {"__decltype", DECLTYPE, OP_DECLTYPE, FLAG_CXX },
    {"decltype", DECLTYPE, OP_DECLTYPE, FLAG_CXX | FLAG_SHADOW },

    {"typeid", TYPEID, OP_TYPEID, FLAG_CXX}
  };


static void
scan_macro_expansion (const char *expansion)
{
  /* We'd better not be trying to push the stack twice.  */
  gdb_assert (! cpstate->macro_original_text);

  /* Copy to the obstack.  */
  const char *copy = obstack_strdup (&cpstate->expansion_obstack, expansion);

  /* Save the old lexptr value, so we can return to it when we're done
     parsing the expanded text.  */
  cpstate->macro_original_text = pstate->lexptr;
  pstate->lexptr = copy;
}

static int
scanning_macro_expansion (void)
{
  return cpstate->macro_original_text != 0;
}

static void
finished_macro_expansion (void)
{
  /* There'd better be something to pop back to.  */
  gdb_assert (cpstate->macro_original_text);

  /* Pop back to the original text.  */
  pstate->lexptr = cpstate->macro_original_text;
  cpstate->macro_original_text = 0;
}

/* Return true iff the token represents a C++ cast operator.  */

static int
is_cast_operator (const char *token, int len)
{
  return (! strncmp (token, "dynamic_cast", len)
	  || ! strncmp (token, "static_cast", len)
	  || ! strncmp (token, "reinterpret_cast", len)
	  || ! strncmp (token, "const_cast", len));
}

/* The scope used for macro expansion.  */
static struct macro_scope *expression_macro_scope;

/* This is set if a NAME token appeared at the very end of the input
   string, with no whitespace separating the name from the EOF.  This
   is used only when parsing to do field name completion.  */
static int saw_name_at_eof;

/* This is set if the previously-returned token was a structure
   operator -- either '.' or ARROW.  */
static bool last_was_structop;

/* Depth of parentheses.  */
static int paren_depth;

/* Read one token, getting characters through lexptr.  */

static int
lex_one_token (struct parser_state *par_state, bool *is_quoted_name)
{
  int c;
  int namelen;
  const char *tokstart;
  bool saw_structop = last_was_structop;

  last_was_structop = false;
  *is_quoted_name = false;

 retry:

  /* Check if this is a macro invocation that we need to expand.  */
  if (! scanning_macro_expansion ())
    {
      gdb::unique_xmalloc_ptr<char> expanded
	= macro_expand_next (&pstate->lexptr, *expression_macro_scope);

      if (expanded != nullptr)
	scan_macro_expansion (expanded.get ());
    }

  pstate->prev_lexptr = pstate->lexptr;

  tokstart = pstate->lexptr;
  /* See if it is a special token of length 3.  */
  for (const auto &token : tokentab3)
    if (strncmp (tokstart, token.oper, 3) == 0)
      {
	if ((token.flags & FLAG_CXX) != 0
	    && par_state->language ()->la_language != language_cplus)
	  break;
	gdb_assert ((token.flags & FLAG_C) == 0);

	pstate->lexptr += 3;
	yylval.opcode = token.opcode;
	return token.token;
      }

  /* See if it is a special token of length 2.  */
  for (const auto &token : tokentab2)
    if (strncmp (tokstart, token.oper, 2) == 0)
      {
	if ((token.flags & FLAG_CXX) != 0
	    && par_state->language ()->la_language != language_cplus)
	  break;
	gdb_assert ((token.flags & FLAG_C) == 0);

	pstate->lexptr += 2;
	yylval.opcode = token.opcode;
	if (token.token == ARROW)
	  last_was_structop = 1;
	return token.token;
      }

  switch (c = *tokstart)
    {
    case 0:
      /* If we were just scanning the result of a macro expansion,
	 then we need to resume scanning the original text.
	 If we're parsing for field name completion, and the previous
	 token allows such completion, return a COMPLETE token.
	 Otherwise, we were already scanning the original text, and
	 we're really done.  */
      if (scanning_macro_expansion ())
	{
	  finished_macro_expansion ();
	  goto retry;
	}
      else if (saw_name_at_eof)
	{
	  saw_name_at_eof = 0;
	  return COMPLETE;
	}
      else if (par_state->parse_completion && saw_structop)
	return COMPLETE;
      else
	return 0;

    case ' ':
    case '\t':
    case '\n':
      pstate->lexptr++;
      goto retry;

    case '[':
    case '(':
      paren_depth++;
      pstate->lexptr++;
      if (par_state->language ()->la_language == language_objc
	  && c == '[')
	return OBJC_LBRAC;
      return c;

    case ']':
    case ')':
      if (paren_depth == 0)
	return 0;
      paren_depth--;
      pstate->lexptr++;
      return c;

    case ',':
      if (pstate->comma_terminates
	  && paren_depth == 0
	  && ! scanning_macro_expansion ())
	return 0;
      pstate->lexptr++;
      return c;

    case '.':
      /* Might be a floating point number.  */
      if (pstate->lexptr[1] < '0' || pstate->lexptr[1] > '9')
	{
	  last_was_structop = true;
	  goto symbol;		/* Nope, must be a symbol. */
	}
      [[fallthrough]];

    case '0':
    case '1':
    case '2':
    case '3':
    case '4':
    case '5':
    case '6':
    case '7':
    case '8':
    case '9':
      {
	/* It's a number.  */
	int got_dot = 0, got_e = 0, got_p = 0, toktype;
	const char *p = tokstart;
	int hex = input_radix > 10;

	if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
	  {
	    p += 2;
	    hex = 1;
	  }
	else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
	  {
	    p += 2;
	    hex = 0;
	  }

	for (;; ++p)
	  {
	    /* This test includes !hex because 'e' is a valid hex digit
	       and thus does not indicate a floating point number when
	       the radix is hex.  */
	    if (!hex && !got_e && !got_p && (*p == 'e' || *p == 'E'))
	      got_dot = got_e = 1;
	    else if (!got_e && !got_p && (*p == 'p' || *p == 'P'))
	      got_dot = got_p = 1;
	    /* This test does not include !hex, because a '.' always indicates
	       a decimal floating point number regardless of the radix.  */
	    else if (!got_dot && *p == '.')
	      got_dot = 1;
	    else if (((got_e && (p[-1] == 'e' || p[-1] == 'E'))
		      || (got_p && (p[-1] == 'p' || p[-1] == 'P')))
		     && (*p == '-' || *p == '+'))
	      /* This is the sign of the exponent, not the end of the
		 number.  */
	      continue;
	    /* We will take any letters or digits.  parse_number will
	       complain if past the radix, or if L or U are not final.  */
	    else if ((*p < '0' || *p > '9')
		     && ((*p < 'a' || *p > 'z')
				  && (*p < 'A' || *p > 'Z')))
	      break;
	  }
	toktype = parse_number (par_state, tokstart, p - tokstart,
				got_dot | got_e | got_p, &yylval);
	if (toktype == ERROR)
	  {
	    char *err_copy = (char *) alloca (p - tokstart + 1);

	    memcpy (err_copy, tokstart, p - tokstart);
	    err_copy[p - tokstart] = 0;
	    error (_("Invalid number \"%s\"."), err_copy);
	  }
	pstate->lexptr = p;
	return toktype;
      }

    case '@':
      {
	const char *p = &tokstart[1];

	if (par_state->language ()->la_language == language_objc)
	  {
	    size_t len = strlen ("selector");

	    if (strncmp (p, "selector", len) == 0
		&& (p[len] == '\0' || ISSPACE (p[len])))
	      {
		pstate->lexptr = p + len;
		return SELECTOR;
	      }
	    else if (*p == '"')
	      goto parse_string;
	  }

	while (ISSPACE (*p))
	  p++;
	size_t len = strlen ("entry");
	if (strncmp (p, "entry", len) == 0 && !c_ident_is_alnum (p[len])
	    && p[len] != '_')
	  {
	    pstate->lexptr = &p[len];
	    return ENTRY;
	  }
      }
      [[fallthrough]];
    case '+':
    case '-':
    case '*':
    case '/':
    case '%':
    case '|':
    case '&':
    case '^':
    case '~':
    case '!':
    case '<':
    case '>':
    case '?':
    case ':':
    case '=':
    case '{':
    case '}':
    symbol:
      pstate->lexptr++;
      return c;

    case 'L':
    case 'u':
    case 'U':
      if (tokstart[1] != '"' && tokstart[1] != '\'')
	break;
      [[fallthrough]];
    case '\'':
    case '"':

    parse_string:
      {
	int host_len;
	int result = parse_string_or_char (tokstart, &pstate->lexptr,
					   &yylval.tsval, &host_len);
	if (result == CHAR)
	  {
	    if (host_len == 0)
	      error (_("Empty character constant."));
	    else if (host_len > 2 && c == '\'')
	      {
		++tokstart;
		namelen = pstate->lexptr - tokstart - 1;
		*is_quoted_name = true;

		goto tryname;
	      }
	    else if (host_len > 1)
	      error (_("Invalid character constant."));
	  }
	return result;
      }
    }

  if (!(c == '_' || c == '$' || c_ident_is_alpha (c)))
    /* We must have come across a bad character (e.g. ';').  */
    error (_("Invalid character '%c' in expression."), c);

  /* It's a name.  See how long it is.  */
  namelen = 0;
  for (c = tokstart[namelen];
       (c == '_' || c == '$' || c_ident_is_alnum (c) || c == '<');)
    {
      /* Template parameter lists are part of the name.
	 FIXME: This mishandles `print $a<4&&$a>3'.  */

      if (c == '<')
	{
	  if (! is_cast_operator (tokstart, namelen))
	    {
	      /* Scan ahead to get rest of the template specification.  Note
		 that we look ahead only when the '<' adjoins non-whitespace
		 characters; for comparison expressions, e.g. "a < b > c",
		 there must be spaces before the '<', etc. */
	      const char *p = find_template_name_end (tokstart + namelen);

	      if (p)
		namelen = p - tokstart;
	    }
	  break;
	}
      c = tokstart[++namelen];
    }

  /* The token "if" terminates the expression and is NOT removed from
     the input stream.  It doesn't count if it appears in the
     expansion of a macro.  */
  if (namelen == 2
      && tokstart[0] == 'i'
      && tokstart[1] == 'f'
      && ! scanning_macro_expansion ())
    {
      return 0;
    }

  /* For the same reason (breakpoint conditions), "thread N"
     terminates the expression.  "thread" could be an identifier, but
     an identifier is never followed by a number without intervening
     punctuation.  "task" is similar.  Handle abbreviations of these,
     similarly to breakpoint.c:find_condition_and_thread.  */
  if (namelen >= 1
      && (strncmp (tokstart, "thread", namelen) == 0
	  || strncmp (tokstart, "task", namelen) == 0)
      && (tokstart[namelen] == ' ' || tokstart[namelen] == '\t')
      && ! scanning_macro_expansion ())
    {
      const char *p = tokstart + namelen + 1;

      while (*p == ' ' || *p == '\t')
	p++;
      if (*p >= '0' && *p <= '9')
	return 0;
    }

  pstate->lexptr += namelen;

  tryname:

  yylval.sval.ptr = tokstart;
  yylval.sval.length = namelen;

  /* Catch specific keywords.  */
  std::string copy = copy_name (yylval.sval);
  for (const auto &token : ident_tokens)
    if (copy == token.oper)
      {
	if ((token.flags & FLAG_CXX) != 0
	    && par_state->language ()->la_language != language_cplus)
	  break;
	if ((token.flags & FLAG_C) != 0
	    && par_state->language ()->la_language != language_c
	    && par_state->language ()->la_language != language_objc)
	  break;

	if ((token.flags & FLAG_SHADOW) != 0)
	  {
	    struct field_of_this_result is_a_field_of_this;

	    if (lookup_symbol (copy.c_str (),
			       pstate->expression_context_block,
			       SEARCH_VFT,
			       (par_state->language ()->la_language
				== language_cplus ? &is_a_field_of_this
				: NULL)).symbol
		!= NULL)
	      {
		/* The keyword is shadowed.  */
		break;
	      }
	  }

	/* It is ok to always set this, even though we don't always
	   strictly need to.  */
	yylval.opcode = token.opcode;
	return token.token;
      }

  if (*tokstart == '$')
    return DOLLAR_VARIABLE;

  if (pstate->parse_completion && *pstate->lexptr == '\0')
    saw_name_at_eof = 1;

  yylval.ssym.stoken = yylval.sval;
  yylval.ssym.sym.symbol = NULL;
  yylval.ssym.sym.block = NULL;
  yylval.ssym.is_a_field_of_this = 0;
  return NAME;
}

/* An object of this type is pushed on a FIFO by the "outer" lexer.  */
struct c_token_and_value
{
  int token;
  YYSTYPE value;
};

/* A FIFO of tokens that have been read but not yet returned to the
   parser.  */
static std::vector<c_token_and_value> token_fifo;

/* Non-zero if the lexer should return tokens from the FIFO.  */
static int popping;

/* Temporary storage for c_lex; this holds symbol names as they are
   built up.  */
static auto_obstack name_obstack;

/* Classify a NAME token.  The contents of the token are in `yylval'.
   Updates yylval and returns the new token type.  BLOCK is the block
   in which lookups start; this can be NULL to mean the global scope.
   IS_QUOTED_NAME is non-zero if the name token was originally quoted
   in single quotes.  IS_AFTER_STRUCTOP is true if this name follows
   a structure operator -- either '.' or ARROW  */

static int
classify_name (struct parser_state *par_state, const struct block *block,
	       bool is_quoted_name, bool is_after_structop)
{
  struct block_symbol bsym;
  struct field_of_this_result is_a_field_of_this;

  std::string copy = copy_name (yylval.sval);

  /* Initialize this in case we *don't* use it in this call; that way
     we can refer to it unconditionally below.  */
  memset (&is_a_field_of_this, 0, sizeof (is_a_field_of_this));

  bsym = lookup_symbol (copy.c_str (), block, SEARCH_VFT,
			par_state->language ()->name_of_this ()
			? &is_a_field_of_this : NULL);

  if (bsym.symbol && bsym.symbol->aclass () == LOC_BLOCK)
    {
      yylval.ssym.sym = bsym;
      yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
      return BLOCKNAME;
    }
  else if (!bsym.symbol)
    {
      /* If we found a field of 'this', we might have erroneously
	 found a constructor where we wanted a type name.  Handle this
	 case by noticing that we found a constructor and then look up
	 the type tag instead.  */
      if (is_a_field_of_this.type != NULL
	  && is_a_field_of_this.fn_field != NULL
	  && TYPE_FN_FIELD_CONSTRUCTOR (is_a_field_of_this.fn_field->fn_fields,
					0))
	{
	  struct field_of_this_result inner_is_a_field_of_this;

	  bsym = lookup_symbol (copy.c_str (), block, SEARCH_STRUCT_DOMAIN,
				&inner_is_a_field_of_this);
	  if (bsym.symbol != NULL)
	    {
	      yylval.tsym.type = bsym.symbol->type ();
	      return TYPENAME;
	    }
	}

      /* If we found a field on the "this" object, or we are looking
	 up a field on a struct, then we want to prefer it over a
	 filename.  However, if the name was quoted, then it is better
	 to check for a filename or a block, since this is the only
	 way the user has of requiring the extension to be used.  */
      if ((is_a_field_of_this.type == NULL && !is_after_structop) 
	  || is_quoted_name)
	{
	  /* See if it's a file name. */
	  struct symtab *symtab;

	  symtab = lookup_symtab (copy.c_str ());
	  if (symtab)
	    {
	      yylval.bval
		= symtab->compunit ()->blockvector ()->static_block ();

	      return FILENAME;
	    }
	}
    }

  if (bsym.symbol && bsym.symbol->aclass () == LOC_TYPEDEF)
    {
      yylval.tsym.type = bsym.symbol->type ();
      return TYPENAME;
    }

  /* See if it's an ObjC classname.  */
  if (par_state->language ()->la_language == language_objc && !bsym.symbol)
    {
      CORE_ADDR Class = lookup_objc_class (par_state->gdbarch (),
					   copy.c_str ());
      if (Class)
	{
	  struct symbol *sym;

	  yylval.theclass.theclass = Class;
	  sym = lookup_struct_typedef (copy.c_str (),
				       par_state->expression_context_block, 1);
	  if (sym)
	    yylval.theclass.type = sym->type ();
	  return CLASSNAME;
	}
    }

  /* Input names that aren't symbols but ARE valid hex numbers, when
     the input radix permits them, can be names or numbers depending
     on the parse.  Note we support radixes > 16 here.  */
  if (!bsym.symbol
      && ((copy[0] >= 'a' && copy[0] < 'a' + input_radix - 10)
	  || (copy[0] >= 'A' && copy[0] < 'A' + input_radix - 10)))
    {
      YYSTYPE newlval;	/* Its value is ignored.  */
      int hextype = parse_number (par_state, copy.c_str (), yylval.sval.length,
				  0, &newlval);

      if (hextype == INT)
	{
	  yylval.ssym.sym = bsym;
	  yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;
	  return NAME_OR_INT;
	}
    }

  /* Any other kind of symbol */
  yylval.ssym.sym = bsym;
  yylval.ssym.is_a_field_of_this = is_a_field_of_this.type != NULL;

  if (bsym.symbol == NULL
      && par_state->language ()->la_language == language_cplus
      && is_a_field_of_this.type == NULL
      && lookup_minimal_symbol (copy.c_str (), NULL, NULL).minsym == NULL)
    return UNKNOWN_CPP_NAME;

  return NAME;
}

/* Like classify_name, but used by the inner loop of the lexer, when a
   name might have already been seen.  CONTEXT is the context type, or
   NULL if this is the first component of a name.  */

static int
classify_inner_name (struct parser_state *par_state,
		     const struct block *block, struct type *context)
{
  struct type *type;

  if (context == NULL)
    return classify_name (par_state, block, false, false);

  type = check_typedef (context);
  if (!type_aggregate_p (type))
    return ERROR;

  std::string copy = copy_name (yylval.ssym.stoken);
  /* N.B. We assume the symbol can only be in VAR_DOMAIN.  */
  yylval.ssym.sym = cp_lookup_nested_symbol (type, copy.c_str (), block,
					     SEARCH_VFT);

  /* If no symbol was found, search for a matching base class named
     COPY.  This will allow users to enter qualified names of class members
     relative to the `this' pointer.  */
  if (yylval.ssym.sym.symbol == NULL)
    {
      struct type *base_type = cp_find_type_baseclass_by_name (type,
							       copy.c_str ());

      if (base_type != NULL)
	{
	  yylval.tsym.type = base_type;
	  return TYPENAME;
	}

      return ERROR;
    }

  switch (yylval.ssym.sym.symbol->aclass ())
    {
    case LOC_BLOCK:
    case LOC_LABEL:
      /* cp_lookup_nested_symbol might have accidentally found a constructor
	 named COPY when we really wanted a base class of the same name.
	 Double-check this case by looking for a base class.  */
      {
	struct type *base_type
	  = cp_find_type_baseclass_by_name (type, copy.c_str ());

	if (base_type != NULL)
	  {
	    yylval.tsym.type = base_type;
	    return TYPENAME;
	  }
      }
      return ERROR;

    case LOC_TYPEDEF:
      yylval.tsym.type = yylval.ssym.sym.symbol->type ();
      return TYPENAME;

    default:
      return NAME;
    }
  internal_error (_("not reached"));
}

/* The outer level of a two-level lexer.  This calls the inner lexer
   to return tokens.  It then either returns these tokens, or
   aggregates them into a larger token.  This lets us work around a
   problem in our parsing approach, where the parser could not
   distinguish between qualified names and qualified types at the
   right point.

   This approach is still not ideal, because it mishandles template
   types.  See the comment in lex_one_token for an example.  However,
   this is still an improvement over the earlier approach, and will
   suffice until we move to better parsing technology.  */

static int
yylex (void)
{
  c_token_and_value current;
  int first_was_coloncolon, last_was_coloncolon;
  struct type *context_type = NULL;
  int last_to_examine, next_to_examine, checkpoint;
  const struct block *search_block;
  bool is_quoted_name, last_lex_was_structop;

  if (popping && !token_fifo.empty ())
    goto do_pop;
  popping = 0;

  last_lex_was_structop = last_was_structop;

  /* Read the first token and decide what to do.  Most of the
     subsequent code is C++-only; but also depends on seeing a "::" or
     name-like token.  */
  current.token = lex_one_token (pstate, &is_quoted_name);
  if (current.token == NAME)
    current.token = classify_name (pstate, pstate->expression_context_block,
				   is_quoted_name, last_lex_was_structop);
  if (pstate->language ()->la_language != language_cplus
      || (current.token != TYPENAME && current.token != COLONCOLON
	  && current.token != FILENAME))
    return current.token;

  /* Read any sequence of alternating "::" and name-like tokens into
     the token FIFO.  */
  current.value = yylval;
  token_fifo.push_back (current);
  last_was_coloncolon = current.token == COLONCOLON;
  while (1)
    {
      bool ignore;

      /* We ignore quoted names other than the very first one.
	 Subsequent ones do not have any special meaning.  */
      current.token = lex_one_token (pstate, &ignore);
      current.value = yylval;
      token_fifo.push_back (current);

      if ((last_was_coloncolon && current.token != NAME)
	  || (!last_was_coloncolon && current.token != COLONCOLON))
	break;
      last_was_coloncolon = !last_was_coloncolon;
    }
  popping = 1;

  /* We always read one extra token, so compute the number of tokens
     to examine accordingly.  */
  last_to_examine = token_fifo.size () - 2;
  next_to_examine = 0;

  current = token_fifo[next_to_examine];
  ++next_to_examine;

  name_obstack.clear ();
  checkpoint = 0;
  if (current.token == FILENAME)
    search_block = current.value.bval;
  else if (current.token == COLONCOLON)
    search_block = NULL;
  else
    {
      gdb_assert (current.token == TYPENAME);
      search_block = pstate->expression_context_block;
      obstack_grow (&name_obstack, current.value.sval.ptr,
		    current.value.sval.length);
      context_type = current.value.tsym.type;
      checkpoint = 1;
    }

  first_was_coloncolon = current.token == COLONCOLON;
  last_was_coloncolon = first_was_coloncolon;

  while (next_to_examine <= last_to_examine)
    {
      c_token_and_value next;

      next = token_fifo[next_to_examine];
      ++next_to_examine;

      if (next.token == NAME && last_was_coloncolon)
	{
	  int classification;

	  yylval = next.value;
	  classification = classify_inner_name (pstate, search_block,
						context_type);
	  /* We keep going until we either run out of names, or until
	     we have a qualified name which is not a type.  */
	  if (classification != TYPENAME && classification != NAME)
	    break;

	  /* Accept up to this token.  */
	  checkpoint = next_to_examine;

	  /* Update the partial name we are constructing.  */
	  if (context_type != NULL)
	    {
	      /* We don't want to put a leading "::" into the name.  */
	      obstack_grow_str (&name_obstack, "::");
	    }
	  obstack_grow (&name_obstack, next.value.sval.ptr,
			next.value.sval.length);

	  yylval.sval.ptr = (const char *) obstack_base (&name_obstack);
	  yylval.sval.length = obstack_object_size (&name_obstack);
	  current.value = yylval;
	  current.token = classification;

	  last_was_coloncolon = 0;

	  if (classification == NAME)
	    break;

	  context_type = yylval.tsym.type;
	}
      else if (next.token == COLONCOLON && !last_was_coloncolon)
	last_was_coloncolon = 1;
      else
	{
	  /* We've reached the end of the name.  */
	  break;
	}
    }

  /* If we have a replacement token, install it as the first token in
     the FIFO, and delete the other constituent tokens.  */
  if (checkpoint > 0)
    {
      current.value.sval.ptr
	= obstack_strndup (&cpstate->expansion_obstack,
			   current.value.sval.ptr,
			   current.value.sval.length);

      token_fifo[0] = current;
      if (checkpoint > 1)
	token_fifo.erase (token_fifo.begin () + 1,
			  token_fifo.begin () + checkpoint);
    }

 do_pop:
  current = token_fifo[0];
  token_fifo.erase (token_fifo.begin ());
  yylval = current.value;
  return current.token;
}

int
c_parse (struct parser_state *par_state)
{
  /* Setting up the parser state.  */
  scoped_restore pstate_restore = make_scoped_restore (&pstate);
  gdb_assert (par_state != NULL);
  pstate = par_state;

  c_parse_state cstate;
  scoped_restore cstate_restore = make_scoped_restore (&cpstate, &cstate);

  gdb::unique_xmalloc_ptr<struct macro_scope> macro_scope;

  if (par_state->expression_context_block)
    macro_scope
      = sal_macro_scope (find_pc_line (par_state->expression_context_pc, 0));
  else
    macro_scope = default_macro_scope ();
  if (! macro_scope)
    macro_scope = user_macro_scope ();

  scoped_restore restore_macro_scope
    = make_scoped_restore (&expression_macro_scope, macro_scope.get ());

  scoped_restore restore_yydebug = make_scoped_restore (&yydebug,
							par_state->debug);

  /* Initialize some state used by the lexer.  */
  last_was_structop = false;
  saw_name_at_eof = 0;
  paren_depth = 0;

  token_fifo.clear ();
  popping = 0;
  name_obstack.clear ();

  int result = yyparse ();
  if (!result)
    pstate->set_operation (pstate->pop ());
  return result;
}

#if defined(YYBISON) && YYBISON < 30800


/* This is called via the YYPRINT macro when parser debugging is
   enabled.  It prints a token's value.  */

static void
c_print_token (FILE *file, int type, YYSTYPE value)
{
  switch (type)
    {
    case INT:
      parser_fprintf (file, "typed_val_int<%s, %s>",
		      TYPE_SAFE_NAME (value.typed_val_int.type),
		      pulongest (value.typed_val_int.val));
      break;

    case CHAR:
    case STRING:
      {
	char *copy = (char *) alloca (value.tsval.length + 1);

	memcpy (copy, value.tsval.ptr, value.tsval.length);
	copy[value.tsval.length] = '\0';

	parser_fprintf (file, "tsval<type=%d, %s>", value.tsval.type, copy);
      }
      break;

    case NSSTRING:
    case DOLLAR_VARIABLE:
      parser_fprintf (file, "sval<%s>", copy_name (value.sval).c_str ());
      break;

    case TYPENAME:
      parser_fprintf (file, "tsym<type=%s, name=%s>",
		      TYPE_SAFE_NAME (value.tsym.type),
		      copy_name (value.tsym.stoken).c_str ());
      break;

    case NAME:
    case UNKNOWN_CPP_NAME:
    case NAME_OR_INT:
    case BLOCKNAME:
      parser_fprintf (file, "ssym<name=%s, sym=%s, field_of_this=%d>",
		       copy_name (value.ssym.stoken).c_str (),
		       (value.ssym.sym.symbol == NULL
			? "(null)" : value.ssym.sym.symbol->print_name ()),
		       value.ssym.is_a_field_of_this);
      break;

    case FILENAME:
      parser_fprintf (file, "bval<%s>", host_address_to_string (value.bval));
      break;
    }
}

#endif

static void
yyerror (const char *msg)
{
  pstate->parse_error (msg);
}