/usr/share/gcc-8/python/libstdcxx/v6/printers.py is in libstdc++6 8-20180414-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | # Pretty-printers for libstdc++.
# Copyright (C) 2008-2018 Free Software Foundation, Inc.
# 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/>.
import gdb
import itertools
import re
import sys
### Python 2 + Python 3 compatibility code
# Resources about compatibility:
#
# * <http://pythonhosted.org/six/>: Documentation of the "six" module
# FIXME: The handling of e.g. std::basic_string (at least on char)
# probably needs updating to work with Python 3's new string rules.
#
# In particular, Python 3 has a separate type (called byte) for
# bytestrings, and a special b"" syntax for the byte literals; the old
# str() type has been redefined to always store Unicode text.
#
# We probably can't do much about this until this GDB PR is addressed:
# <https://sourceware.org/bugzilla/show_bug.cgi?id=17138>
if sys.version_info[0] > 2:
### Python 3 stuff
Iterator = object
# Python 3 folds these into the normal functions.
imap = map
izip = zip
# Also, int subsumes long
long = int
else:
### Python 2 stuff
class Iterator:
"""Compatibility mixin for iterators
Instead of writing next() methods for iterators, write
__next__() methods and use this mixin to make them work in
Python 2 as well as Python 3.
Idea stolen from the "six" documentation:
<http://pythonhosted.org/six/#six.Iterator>
"""
def next(self):
return self.__next__()
# In Python 2, we still need these from itertools
from itertools import imap, izip
# Try to use the new-style pretty-printing if available.
_use_gdb_pp = True
try:
import gdb.printing
except ImportError:
_use_gdb_pp = False
# Try to install type-printers.
_use_type_printing = False
try:
import gdb.types
if hasattr(gdb.types, 'TypePrinter'):
_use_type_printing = True
except ImportError:
pass
# Starting with the type ORIG, search for the member type NAME. This
# handles searching upward through superclasses. This is needed to
# work around http://sourceware.org/bugzilla/show_bug.cgi?id=13615.
def find_type(orig, name):
typ = orig.strip_typedefs()
while True:
# Strip cv-qualifiers. PR 67440.
search = '%s::%s' % (typ.unqualified(), name)
try:
return gdb.lookup_type(search)
except RuntimeError:
pass
# The type was not found, so try the superclass. We only need
# to check the first superclass, so we don't bother with
# anything fancier here.
field = typ.fields()[0]
if not field.is_base_class:
raise ValueError("Cannot find type %s::%s" % (str(orig), name))
typ = field.type
_versioned_namespace = '__8::'
def is_specialization_of(type, template_name):
"Test if a type is a given template instantiation."
global _versioned_namespace
if _versioned_namespace:
return re.match('^std::(%s)?%s<.*>$' % (_versioned_namespace, template_name), type) is not None
return re.match('^std::%s<.*>$' % template_name, type) is not None
def strip_versioned_namespace(typename):
global _versioned_namespace
if _versioned_namespace:
return typename.replace(_versioned_namespace, '')
return typename
def strip_inline_namespaces(type_str):
"Remove known inline namespaces from the canonical name of a type."
type_str = strip_versioned_namespace(type_str)
type_str = type_str.replace('std::__cxx11::', 'std::')
expt_ns = 'std::experimental::'
for lfts_ns in ('fundamentals_v1', 'fundamentals_v2'):
type_str = type_str.replace(expt_ns+lfts_ns+'::', expt_ns)
fs_ns = expt_ns + 'filesystem::'
type_str = type_str.replace(fs_ns+'v1::', fs_ns)
return type_str
def get_template_arg_list(type_obj):
"Return a type's template arguments as a list"
n = 0
template_args = []
while True:
try:
template_args.append(type_obj.template_argument(n))
except:
return template_args
n += 1
class SmartPtrIterator(Iterator):
"An iterator for smart pointer types with a single 'child' value"
def __init__(self, val):
self.val = val
def __iter__(self):
return self
def __next__(self):
if self.val is None:
raise StopIteration
self.val, val = None, self.val
return ('get()', val)
class SharedPointerPrinter:
"Print a shared_ptr or weak_ptr"
def __init__ (self, typename, val):
self.typename = strip_versioned_namespace(typename)
self.val = val
self.pointer = val['_M_ptr']
def children (self):
return SmartPtrIterator(self.pointer)
def to_string (self):
state = 'empty'
refcounts = self.val['_M_refcount']['_M_pi']
if refcounts != 0:
usecount = refcounts['_M_use_count']
weakcount = refcounts['_M_weak_count']
if usecount == 0:
state = 'expired, weak count %d' % weakcount
else:
state = 'use count %d, weak count %d' % (usecount, weakcount - 1)
return '%s<%s> (%s)' % (self.typename, str(self.val.type.template_argument(0)), state)
class UniquePointerPrinter:
"Print a unique_ptr"
def __init__ (self, typename, val):
self.val = val
impl_type = val.type.fields()[0].type.tag
if is_specialization_of(impl_type, '__uniq_ptr_impl'): # New implementation
self.pointer = val['_M_t']['_M_t']['_M_head_impl']
elif is_specialization_of(impl_type, 'tuple'):
self.pointer = val['_M_t']['_M_head_impl']
else:
raise ValueError("Unsupported implementation for unique_ptr: %s" % impl_type)
def children (self):
return SmartPtrIterator(self.pointer)
def to_string (self):
return ('std::unique_ptr<%s>' % (str(self.val.type.template_argument(0))))
def get_value_from_aligned_membuf(buf, valtype):
"""Returns the value held in a __gnu_cxx::__aligned_membuf."""
return buf['_M_storage'].address.cast(valtype.pointer()).dereference()
def get_value_from_list_node(node):
"""Returns the value held in an _List_node<_Val>"""
try:
member = node.type.fields()[1].name
if member == '_M_data':
# C++03 implementation, node contains the value as a member
return node['_M_data']
elif member == '_M_storage':
# C++11 implementation, node stores value in __aligned_membuf
valtype = node.type.template_argument(0)
return get_value_from_aligned_membuf(node['_M_storage'], valtype)
except:
pass
raise ValueError("Unsupported implementation for %s" % str(node.type))
class StdListPrinter:
"Print a std::list"
class _iterator(Iterator):
def __init__(self, nodetype, head):
self.nodetype = nodetype
self.base = head['_M_next']
self.head = head.address
self.count = 0
def __iter__(self):
return self
def __next__(self):
if self.base == self.head:
raise StopIteration
elt = self.base.cast(self.nodetype).dereference()
self.base = elt['_M_next']
count = self.count
self.count = self.count + 1
val = get_value_from_list_node(elt)
return ('[%d]' % count, val)
def __init__(self, typename, val):
self.typename = strip_versioned_namespace(typename)
self.val = val
def children(self):
nodetype = find_type(self.val.type, '_Node')
nodetype = nodetype.strip_typedefs().pointer()
return self._iterator(nodetype, self.val['_M_impl']['_M_node'])
def to_string(self):
if self.val['_M_impl']['_M_node'].address == self.val['_M_impl']['_M_node']['_M_next']:
return 'empty %s' % (self.typename)
return '%s' % (self.typename)
class NodeIteratorPrinter:
def __init__(self, typename, val, contname):
self.val = val
self.typename = typename
self.contname = contname
def to_string(self):
if not self.val['_M_node']:
return 'non-dereferenceable iterator for std::%s' % (self.contname)
nodetype = find_type(self.val.type, '_Node')
nodetype = nodetype.strip_typedefs().pointer()
node = self.val['_M_node'].cast(nodetype).dereference()
return str(get_value_from_list_node(node))
class StdListIteratorPrinter(NodeIteratorPrinter):
"Print std::list::iterator"
def __init__(self, typename, val):
NodeIteratorPrinter.__init__(self, typename, val, 'list')
class StdFwdListIteratorPrinter(NodeIteratorPrinter):
"Print std::forward_list::iterator"
def __init__(self, typename, val):
NodeIteratorPrinter.__init__(self, typename, val, 'forward_list')
class StdSlistPrinter:
"Print a __gnu_cxx::slist"
class _iterator(Iterator):
def __init__(self, nodetype, head):
self.nodetype = nodetype
self.base = head['_M_head']['_M_next']
self.count = 0
def __iter__(self):
return self
def __next__(self):
if self.base == 0:
raise StopIteration
elt = self.base.cast(self.nodetype).dereference()
self.base = elt['_M_next']
count = self.count
self.count = self.count + 1
return ('[%d]' % count, elt['_M_data'])
def __init__(self, typename, val):
self.val = val
def children(self):
nodetype = find_type(self.val.type, '_Node')
nodetype = nodetype.strip_typedefs().pointer()
return self._iterator(nodetype, self.val)
def to_string(self):
if self.val['_M_head']['_M_next'] == 0:
return 'empty __gnu_cxx::slist'
return '__gnu_cxx::slist'
class StdSlistIteratorPrinter:
"Print __gnu_cxx::slist::iterator"
def __init__(self, typename, val):
self.val = val
def to_string(self):
if not self.val['_M_node']:
return 'non-dereferenceable iterator for __gnu_cxx::slist'
nodetype = find_type(self.val.type, '_Node')
nodetype = nodetype.strip_typedefs().pointer()
return str(self.val['_M_node'].cast(nodetype).dereference()['_M_data'])
class StdVectorPrinter:
"Print a std::vector"
class _iterator(Iterator):
def __init__ (self, start, finish, bitvec):
self.bitvec = bitvec
if bitvec:
self.item = start['_M_p']
self.so = start['_M_offset']
self.finish = finish['_M_p']
self.fo = finish['_M_offset']
itype = self.item.dereference().type
self.isize = 8 * itype.sizeof
else:
self.item = start
self.finish = finish
self.count = 0
def __iter__(self):
return self
def __next__(self):
count = self.count
self.count = self.count + 1
if self.bitvec:
if self.item == self.finish and self.so >= self.fo:
raise StopIteration
elt = self.item.dereference()
if elt & (1 << self.so):
obit = 1
else:
obit = 0
self.so = self.so + 1
if self.so >= self.isize:
self.item = self.item + 1
self.so = 0
return ('[%d]' % count, obit)
else:
if self.item == self.finish:
raise StopIteration
elt = self.item.dereference()
self.item = self.item + 1
return ('[%d]' % count, elt)
def __init__(self, typename, val):
self.typename = strip_versioned_namespace(typename)
self.val = val
self.is_bool = val.type.template_argument(0).code == gdb.TYPE_CODE_BOOL
def children(self):
return self._iterator(self.val['_M_impl']['_M_start'],
self.val['_M_impl']['_M_finish'],
self.is_bool)
def to_string(self):
start = self.val['_M_impl']['_M_start']
finish = self.val['_M_impl']['_M_finish']
end = self.val['_M_impl']['_M_end_of_storage']
if self.is_bool:
start = self.val['_M_impl']['_M_start']['_M_p']
so = self.val['_M_impl']['_M_start']['_M_offset']
finish = self.val['_M_impl']['_M_finish']['_M_p']
fo = self.val['_M_impl']['_M_finish']['_M_offset']
itype = start.dereference().type
bl = 8 * itype.sizeof
length = (bl - so) + bl * ((finish - start) - 1) + fo
capacity = bl * (end - start)
return ('%s<bool> of length %d, capacity %d'
% (self.typename, int (length), int (capacity)))
else:
return ('%s of length %d, capacity %d'
% (self.typename, int (finish - start), int (end - start)))
def display_hint(self):
return 'array'
class StdVectorIteratorPrinter:
"Print std::vector::iterator"
def __init__(self, typename, val):
self.val = val
def to_string(self):
if not self.val['_M_current']:
return 'non-dereferenceable iterator for std::vector'
return str(self.val['_M_current'].dereference())
class StdTuplePrinter:
"Print a std::tuple"
class _iterator(Iterator):
def __init__ (self, head):
self.head = head
# Set the base class as the initial head of the
# tuple.
nodes = self.head.type.fields ()
if len (nodes) == 1:
# Set the actual head to the first pair.
self.head = self.head.cast (nodes[0].type)
elif len (nodes) != 0:
raise ValueError("Top of tuple tree does not consist of a single node.")
self.count = 0
def __iter__ (self):
return self
def __next__ (self):
# Check for further recursions in the inheritance tree.
# For a GCC 5+ tuple self.head is None after visiting all nodes:
if not self.head:
raise StopIteration
nodes = self.head.type.fields ()
# For a GCC 4.x tuple there is a final node with no fields:
if len (nodes) == 0:
raise StopIteration
# Check that this iteration has an expected structure.
if len (nodes) > 2:
raise ValueError("Cannot parse more than 2 nodes in a tuple tree.")
if len (nodes) == 1:
# This is the last node of a GCC 5+ std::tuple.
impl = self.head.cast (nodes[0].type)
self.head = None
else:
# Either a node before the last node, or the last node of
# a GCC 4.x tuple (which has an empty parent).
# - Left node is the next recursion parent.
# - Right node is the actual class contained in the tuple.
# Process right node.
impl = self.head.cast (nodes[1].type)
# Process left node and set it as head.
self.head = self.head.cast (nodes[0].type)
self.count = self.count + 1
# Finally, check the implementation. If it is
# wrapped in _M_head_impl return that, otherwise return
# the value "as is".
fields = impl.type.fields ()
if len (fields) < 1 or fields[0].name != "_M_head_impl":
return ('[%d]' % self.count, impl)
else:
return ('[%d]' % self.count, impl['_M_head_impl'])
def __init__ (self, typename, val):
self.typename = strip_versioned_namespace(typename)
self.val = val;
def children (self):
return self._iterator (self.val)
def to_string (self):
if len (self.val.type.fields ()) == 0:
return 'empty %s' % (self.typename)
return '%s containing' % (self.typename)
class StdStackOrQueuePrinter:
"Print a std::stack or std::queue"
def __init__ (self, typename, val):
self.typename = strip_versioned_namespace(typename)
self.visualizer = gdb.default_visualizer(val['c'])
def children (self):
return self.visualizer.children()
def to_string (self):
return '%s wrapping: %s' % (self.typename,
self.visualizer.to_string())
def display_hint (self):
if hasattr (self.visualizer, 'display_hint'):
return self.visualizer.display_hint ()
return None
class RbtreeIterator(Iterator):
"""
Turn an RB-tree-based container (std::map, std::set etc.) into
a Python iterable object.
"""
def __init__(self, rbtree):
self.size = rbtree['_M_t']['_M_impl']['_M_node_count']
self.node = rbtree['_M_t']['_M_impl']['_M_header']['_M_left']
self.count = 0
def __iter__(self):
return self
def __len__(self):
return int (self.size)
def __next__(self):
if self.count == self.size:
raise StopIteration
result = self.node
self.count = self.count + 1
if self.count < self.size:
# Compute the next node.
node = self.node
if node.dereference()['_M_right']:
node = node.dereference()['_M_right']
while node.dereference()['_M_left']:
node = node.dereference()['_M_left']
else:
parent = node.dereference()['_M_parent']
while node == parent.dereference()['_M_right']:
node = parent
parent = parent.dereference()['_M_parent']
if node.dereference()['_M_right'] != parent:
node = parent
self.node = node
return result
def get_value_from_Rb_tree_node(node):
"""Returns the value held in an _Rb_tree_node<_Val>"""
try:
member = node.type.fields()[1].name
if member == '_M_value_field':
# C++03 implementation, node contains the value as a member
return node['_M_value_field']
elif member == '_M_storage':
# C++11 implementation, node stores value in __aligned_membuf
valtype = node.type.template_argument(0)
return get_value_from_aligned_membuf(node['_M_storage'], valtype)
except:
pass
raise ValueError("Unsupported implementation for %s" % str(node.type))
# This is a pretty printer for std::_Rb_tree_iterator (which is
# std::map::iterator), and has nothing to do with the RbtreeIterator
# class above.
class StdRbtreeIteratorPrinter:
"Print std::map::iterator, std::set::iterator, etc."
def __init__ (self, typename, val):
self.val = val
valtype = self.val.type.template_argument(0).strip_typedefs()
nodetype = '_Rb_tree_node<' + str(valtype) + '>'
if _versioned_namespace and typename.startswith('std::' + _versioned_namespace):
nodetype = _versioned_namespace + nodetype
nodetype = gdb.lookup_type('std::' + nodetype)
self.link_type = nodetype.strip_typedefs().pointer()
def to_string (self):
if not self.val['_M_node']:
return 'non-dereferenceable iterator for associative container'
node = self.val['_M_node'].cast(self.link_type).dereference()
return str(get_value_from_Rb_tree_node(node))
class StdDebugIteratorPrinter:
"Print a debug enabled version of an iterator"
def __init__ (self, typename, val):
self.val = val
# Just strip away the encapsulating __gnu_debug::_Safe_iterator
# and return the wrapped iterator value.
def to_string (self):
base_type = gdb.lookup_type('__gnu_debug::_Safe_iterator_base')
itype = self.val.type.template_argument(0)
safe_seq = self.val.cast(base_type)['_M_sequence']
if not safe_seq:
return str(self.val.cast(itype))
if self.val['_M_version'] != safe_seq['_M_version']:
return "invalid iterator"
return str(self.val.cast(itype))
def num_elements(num):
"""Return either "1 element" or "N elements" depending on the argument."""
return '1 element' if num == 1 else '%d elements' % num
class StdMapPrinter:
"Print a std::map or std::multimap"
# Turn an RbtreeIterator into a pretty-print iterator.
class _iter(Iterator):
def __init__(self, rbiter, type):
self.rbiter = rbiter
self.count = 0
self.type = type
def __iter__(self):
return self
def __next__(self):
if self.count % 2 == 0:
n = next(self.rbiter)
n = n.cast(self.type).dereference()
n = get_value_from_Rb_tree_node(n)
self.pair = n
item = n['first']
else:
item = self.pair['second']
result = ('[%d]' % self.count, item)
self.count = self.count + 1
return result
def __init__ (self, typename, val):
self.typename = strip_versioned_namespace(typename)
self.val = val
def to_string (self):
return '%s with %s' % (self.typename,
num_elements(len(RbtreeIterator (self.val))))
def children (self):
rep_type = find_type(self.val.type, '_Rep_type')
node = find_type(rep_type, '_Link_type')
node = node.strip_typedefs()
return self._iter (RbtreeIterator (self.val), node)
def display_hint (self):
return 'map'
class StdSetPrinter:
"Print a std::set or std::multiset"
# Turn an RbtreeIterator into a pretty-print iterator.
class _iter(Iterator):
def __init__(self, rbiter, type):
self.rbiter = rbiter
self.count = 0
self.type = type
def __iter__(self):
return self
def __next__(self):
item = next(self.rbiter)
item = item.cast(self.type).dereference()
item = get_value_from_Rb_tree_node(item)
# FIXME: this is weird ... what to do?
# Maybe a 'set' display hint?
result = ('[%d]' % self.count, item)
self.count = self.count + 1
return result
def __init__ (self, typename, val):
self.typename = strip_versioned_namespace(typename)
self.val = val
def to_string (self):
return '%s with %s' % (self.typename,
num_elements(len(RbtreeIterator (self.val))))
def children (self):
rep_type = find_type(self.val.type, '_Rep_type')
node = find_type(rep_type, '_Link_type')
node = node.strip_typedefs()
return self._iter (RbtreeIterator (self.val), node)
class StdBitsetPrinter:
"Print a std::bitset"
def __init__(self, typename, val):
self.typename = strip_versioned_namespace(typename)
self.val = val
def to_string (self):
# If template_argument handled values, we could print the
# size. Or we could use a regexp on the type.
return '%s' % (self.typename)
def children (self):
words = self.val['_M_w']
wtype = words.type
# The _M_w member can be either an unsigned long, or an
# array. This depends on the template specialization used.
# If it is a single long, convert to a single element list.
if wtype.code == gdb.TYPE_CODE_ARRAY:
tsize = wtype.target ().sizeof
else:
words = [words]
tsize = wtype.sizeof
nwords = wtype.sizeof / tsize
result = []
byte = 0
while byte < nwords:
w = words[byte]
bit = 0
while w != 0:
if (w & 1) != 0:
# Another spot where we could use 'set'?
result.append(('[%d]' % (byte * tsize * 8 + bit), 1))
bit = bit + 1
w = w >> 1
byte = byte + 1
return result
class StdDequePrinter:
"Print a std::deque"
class _iter(Iterator):
def __init__(self, node, start, end, last, buffer_size):
self.node = node
self.p = start
self.end = end
self.last = last
self.buffer_size = buffer_size
self.count = 0
def __iter__(self):
return self
def __next__(self):
if self.p == self.last:
raise StopIteration
result = ('[%d]' % self.count, self.p.dereference())
self.count = self.count + 1
# Advance the 'cur' pointer.
self.p = self.p + 1
if self.p == self.end:
# If we got to the end of this bucket, move to the
# next bucket.
self.node = self.node + 1
self.p = self.node[0]
self.end = self.p + self.buffer_size
return result
def __init__(self, typename, val):
self.typename = strip_versioned_namespace(typename)
self.val = val
self.elttype = val.type.template_argument(0)
size = self.elttype.sizeof
if size < 512:
self.buffer_size = int (512 / size)
else:
self.buffer_size = 1
def to_string(self):
start = self.val['_M_impl']['_M_start']
end = self.val['_M_impl']['_M_finish']
delta_n = end['_M_node'] - start['_M_node'] - 1
delta_s = start['_M_last'] - start['_M_cur']
delta_e = end['_M_cur'] - end['_M_first']
size = self.buffer_size * delta_n + delta_s + delta_e
return '%s with %s' % (self.typename, num_elements(long(size)))
def children(self):
start = self.val['_M_impl']['_M_start']
end = self.val['_M_impl']['_M_finish']
return self._iter(start['_M_node'], start['_M_cur'], start['_M_last'],
end['_M_cur'], self.buffer_size)
def display_hint (self):
return 'array'
class StdDequeIteratorPrinter:
"Print std::deque::iterator"
def __init__(self, typename, val):
self.val = val
def to_string(self):
if not self.val['_M_cur']:
return 'non-dereferenceable iterator for std::deque'
return str(self.val['_M_cur'].dereference())
class StdStringPrinter:
"Print a std::basic_string of some kind"
def __init__(self, typename, val):
self.val = val
self.new_string = typename.find("::__cxx11::basic_string") != -1
def to_string(self):
# Make sure &string works, too.
type = self.val.type
if type.code == gdb.TYPE_CODE_REF:
type = type.target ()
# Calculate the length of the string so that to_string returns
# the string according to length, not according to first null
# encountered.
ptr = self.val ['_M_dataplus']['_M_p']
if self.new_string:
length = self.val['_M_string_length']
# https://sourceware.org/bugzilla/show_bug.cgi?id=17728
ptr = ptr.cast(ptr.type.strip_typedefs())
else:
realtype = type.unqualified ().strip_typedefs ()
reptype = gdb.lookup_type (str (realtype) + '::_Rep').pointer ()
header = ptr.cast(reptype) - 1
length = header.dereference ()['_M_length']
if hasattr(ptr, "lazy_string"):
return ptr.lazy_string (length = length)
return ptr.string (length = length)
def display_hint (self):
return 'string'
class Tr1HashtableIterator(Iterator):
def __init__ (self, hash):
self.buckets = hash['_M_buckets']
self.bucket = 0
self.bucket_count = hash['_M_bucket_count']
self.node_type = find_type(hash.type, '_Node').pointer()
self.node = 0
while self.bucket != self.bucket_count:
self.node = self.buckets[self.bucket]
if self.node:
break
self.bucket = self.bucket + 1
def __iter__ (self):
return self
def __next__ (self):
if self.node == 0:
raise StopIteration
node = self.node.cast(self.node_type)
result = node.dereference()['_M_v']
self.node = node.dereference()['_M_next'];
if self.node == 0:
self.bucket = self.bucket + 1
while self.bucket != self.bucket_count:
self.node = self.buckets[self.bucket]
if self.node:
break
self.bucket = self.bucket + 1
return result
class StdHashtableIterator(Iterator):
def __init__(self, hash):
self.node = hash['_M_before_begin']['_M_nxt']
self.node_type = find_type(hash.type, '__node_type').pointer()
def __iter__(self):
return self
def __next__(self):
if self.node == 0:
raise StopIteration
elt = self.node.cast(self.node_type).dereference()
self.node = elt['_M_nxt']
valptr = elt['_M_storage'].address
valptr = valptr.cast(elt.type.template_argument(0).pointer())
return valptr.dereference()
class Tr1UnorderedSetPrinter:
"Print a tr1::unordered_set"
def __init__ (self, typename, val):
self.typename = strip_versioned_namespace(typename)
self.val = val
def hashtable (self):
if self.typename.startswith('std::tr1'):
return self.val
return self.val['_M_h']
def to_string (self):
count = self.hashtable()['_M_element_count']
return '%s with %s' % (self.typename, num_elements(count))
@staticmethod
def format_count (i):
return '[%d]' % i
def children (self):
counter = imap (self.format_count, itertools.count())
if self.typename.startswith('std::tr1'):
return izip (counter, Tr1HashtableIterator (self.hashtable()))
return izip (counter, StdHashtableIterator (self.hashtable()))
class Tr1UnorderedMapPrinter:
"Print a tr1::unordered_map"
def __init__ (self, typename, val):
self.typename = strip_versioned_namespace(typename)
self.val = val
def hashtable (self):
if self.typename.startswith('std::tr1'):
return self.val
return self.val['_M_h']
def to_string (self):
count = self.hashtable()['_M_element_count']
return '%s with %s' % (self.typename, num_elements(count))
@staticmethod
def flatten (list):
for elt in list:
for i in elt:
yield i
@staticmethod
def format_one (elt):
return (elt['first'], elt['second'])
@staticmethod
def format_count (i):
return '[%d]' % i
def children (self):
counter = imap (self.format_count, itertools.count())
# Map over the hash table and flatten the result.
if self.typename.startswith('std::tr1'):
data = self.flatten (imap (self.format_one, Tr1HashtableIterator (self.hashtable())))
# Zip the two iterators together.
return izip (counter, data)
data = self.flatten (imap (self.format_one, StdHashtableIterator (self.hashtable())))
# Zip the two iterators together.
return izip (counter, data)
def display_hint (self):
return 'map'
class StdForwardListPrinter:
"Print a std::forward_list"
class _iterator(Iterator):
def __init__(self, nodetype, head):
self.nodetype = nodetype
self.base = head['_M_next']
self.count = 0
def __iter__(self):
return self
def __next__(self):
if self.base == 0:
raise StopIteration
elt = self.base.cast(self.nodetype).dereference()
self.base = elt['_M_next']
count = self.count
self.count = self.count + 1
valptr = elt['_M_storage'].address
valptr = valptr.cast(elt.type.template_argument(0).pointer())
return ('[%d]' % count, valptr.dereference())
def __init__(self, typename, val):
self.val = val
self.typename = strip_versioned_namespace(typename)
def children(self):
nodetype = find_type(self.val.type, '_Node')
nodetype = nodetype.strip_typedefs().pointer()
return self._iterator(nodetype, self.val['_M_impl']['_M_head'])
def to_string(self):
if self.val['_M_impl']['_M_head']['_M_next'] == 0:
return 'empty %s' % self.typename
return '%s' % self.typename
class SingleObjContainerPrinter(object):
"Base class for printers of containers of single objects"
def __init__ (self, val, viz, hint = None):
self.contained_value = val
self.visualizer = viz
self.hint = hint
def _recognize(self, type):
"""Return TYPE as a string after applying type printers"""
global _use_type_printing
if not _use_type_printing:
return str(type)
return gdb.types.apply_type_recognizers(gdb.types.get_type_recognizers(),
type) or str(type)
class _contained(Iterator):
def __init__ (self, val):
self.val = val
def __iter__ (self):
return self
def __next__(self):
if self.val is None:
raise StopIteration
retval = self.val
self.val = None
return ('[contained value]', retval)
def children (self):
if self.contained_value is None:
return self._contained (None)
if hasattr (self.visualizer, 'children'):
return self.visualizer.children ()
return self._contained (self.contained_value)
def display_hint (self):
# if contained value is a map we want to display in the same way
if hasattr (self.visualizer, 'children') and hasattr (self.visualizer, 'display_hint'):
return self.visualizer.display_hint ()
return self.hint
class StdExpAnyPrinter(SingleObjContainerPrinter):
"Print a std::any or std::experimental::any"
def __init__ (self, typename, val):
self.typename = strip_versioned_namespace(typename)
self.typename = re.sub('^std::experimental::fundamentals_v\d::', 'std::experimental::', self.typename, 1)
self.val = val
self.contained_type = None
contained_value = None
visualizer = None
mgr = self.val['_M_manager']
if mgr != 0:
func = gdb.block_for_pc(int(mgr.cast(gdb.lookup_type('intptr_t'))))
if not func:
raise ValueError("Invalid function pointer in %s" % self.typename)
rx = r"""({0}::_Manager_\w+<.*>)::_S_manage\({0}::_Op, {0} const\*, {0}::_Arg\*\)""".format(typename)
m = re.match(rx, func.function.name)
if not m:
raise ValueError("Unknown manager function in %s" % self.typename)
mgrname = m.group(1)
# FIXME need to expand 'std::string' so that gdb.lookup_type works
if 'std::string' in mgrname:
mgrname = re.sub("std::string(?!\w)", str(gdb.lookup_type('std::string').strip_typedefs()), m.group(1))
mgrtype = gdb.lookup_type(mgrname)
self.contained_type = mgrtype.template_argument(0)
valptr = None
if '::_Manager_internal' in mgrname:
valptr = self.val['_M_storage']['_M_buffer'].address
elif '::_Manager_external' in mgrname:
valptr = self.val['_M_storage']['_M_ptr']
else:
raise ValueError("Unknown manager function in %s" % self.typename)
contained_value = valptr.cast(self.contained_type.pointer()).dereference()
visualizer = gdb.default_visualizer(contained_value)
super(StdExpAnyPrinter, self).__init__ (contained_value, visualizer)
def to_string (self):
if self.contained_type is None:
return '%s [no contained value]' % self.typename
desc = "%s containing " % self.typename
if hasattr (self.visualizer, 'children'):
return desc + self.visualizer.to_string ()
valtype = self._recognize (self.contained_type)
return desc + strip_versioned_namespace(str(valtype))
class StdExpOptionalPrinter(SingleObjContainerPrinter):
"Print a std::optional or std::experimental::optional"
def __init__ (self, typename, val):
valtype = self._recognize (val.type.template_argument(0))
self.typename = strip_versioned_namespace(typename)
self.typename = re.sub('^std::(experimental::|)(fundamentals_v\d::|)(.*)', r'std::\1\3<%s>' % valtype, self.typename, 1)
if not self.typename.startswith('std::experimental'):
val = val['_M_payload']
self.val = val
contained_value = val['_M_payload'] if self.val['_M_engaged'] else None
visualizer = gdb.default_visualizer (val['_M_payload'])
super (StdExpOptionalPrinter, self).__init__ (contained_value, visualizer)
def to_string (self):
if self.contained_value is None:
return "%s [no contained value]" % self.typename
if hasattr (self.visualizer, 'children'):
return "%s containing %s" % (self.typename,
self.visualizer.to_string())
return self.typename
class StdVariantPrinter(SingleObjContainerPrinter):
"Print a std::variant"
def __init__(self, typename, val):
alternatives = get_template_arg_list(val.type)
self.typename = strip_versioned_namespace(typename)
self.typename = "%s<%s>" % (self.typename, ', '.join([self._recognize(alt) for alt in alternatives]))
self.index = val['_M_index']
if self.index >= len(alternatives):
self.contained_type = None
contained_value = None
visualizer = None
else:
self.contained_type = alternatives[int(self.index)]
addr = val['_M_u']['_M_first']['_M_storage'].address
contained_value = addr.cast(self.contained_type.pointer()).dereference()
visualizer = gdb.default_visualizer(contained_value)
super (StdVariantPrinter, self).__init__(contained_value, visualizer, 'array')
def to_string(self):
if self.contained_value is None:
return "%s [no contained value]" % self.typename
if hasattr(self.visualizer, 'children'):
return "%s [index %d] containing %s" % (self.typename, self.index,
self.visualizer.to_string())
return "%s [index %d]" % (self.typename, self.index)
class StdNodeHandlePrinter(SingleObjContainerPrinter):
"Print a container node handle"
def __init__(self, typename, val):
self.value_type = val.type.template_argument(1)
nodetype = val.type.template_argument(2).template_argument(0)
self.is_rb_tree_node = is_specialization_of(nodetype.name, '_Rb_tree_node')
self.is_map_node = val.type.template_argument(0) != self.value_type
nodeptr = val['_M_ptr']
if nodeptr:
if self.is_rb_tree_node:
contained_value = get_value_from_Rb_tree_node(nodeptr.dereference())
else:
contained_value = get_value_from_aligned_membuf(nodeptr['_M_storage'],
self.value_type)
visualizer = gdb.default_visualizer(contained_value)
else:
contained_value = None
visualizer = None
optalloc = val['_M_alloc']
self.alloc = optalloc['_M_payload'] if optalloc['_M_engaged'] else None
super(StdNodeHandlePrinter, self).__init__(contained_value, visualizer,
'array')
def to_string(self):
desc = 'node handle for '
if not self.is_rb_tree_node:
desc += 'unordered '
if self.is_map_node:
desc += 'map';
else:
desc += 'set';
if self.contained_value:
desc += ' with element'
if hasattr(self.visualizer, 'children'):
return "%s = %s" % (desc, self.visualizer.to_string())
return desc
else:
return 'empty %s' % desc
class StdExpStringViewPrinter:
"Print a std::basic_string_view or std::experimental::basic_string_view"
def __init__ (self, typename, val):
self.val = val
def to_string (self):
ptr = self.val['_M_str']
len = self.val['_M_len']
if hasattr (ptr, "lazy_string"):
return ptr.lazy_string (length = len)
return ptr.string (length = len)
def display_hint (self):
return 'string'
class StdExpPathPrinter:
"Print a std::experimental::filesystem::path"
def __init__ (self, typename, val):
self.val = val
start = self.val['_M_cmpts']['_M_impl']['_M_start']
finish = self.val['_M_cmpts']['_M_impl']['_M_finish']
self.num_cmpts = int (finish - start)
def _path_type(self):
t = str(self.val['_M_type'])
if t[-9:] == '_Root_dir':
return "root-directory"
if t[-10:] == '_Root_name':
return "root-name"
return None
def to_string (self):
path = "%s" % self.val ['_M_pathname']
if self.num_cmpts == 0:
t = self._path_type()
if t:
path = '%s [%s]' % (path, t)
return "filesystem::path %s" % path
class _iterator(Iterator):
def __init__(self, cmpts):
self.item = cmpts['_M_impl']['_M_start']
self.finish = cmpts['_M_impl']['_M_finish']
self.count = 0
def __iter__(self):
return self
def __next__(self):
if self.item == self.finish:
raise StopIteration
item = self.item.dereference()
count = self.count
self.count = self.count + 1
self.item = self.item + 1
path = item['_M_pathname']
t = StdExpPathPrinter(item.type.name, item)._path_type()
if not t:
t = count
return ('[%s]' % t, path)
def children(self):
return self._iterator(self.val['_M_cmpts'])
# A "regular expression" printer which conforms to the
# "SubPrettyPrinter" protocol from gdb.printing.
class RxPrinter(object):
def __init__(self, name, function):
super(RxPrinter, self).__init__()
self.name = name
self.function = function
self.enabled = True
def invoke(self, value):
if not self.enabled:
return None
if value.type.code == gdb.TYPE_CODE_REF:
if hasattr(gdb.Value,"referenced_value"):
value = value.referenced_value()
return self.function(self.name, value)
# A pretty-printer that conforms to the "PrettyPrinter" protocol from
# gdb.printing. It can also be used directly as an old-style printer.
class Printer(object):
def __init__(self, name):
super(Printer, self).__init__()
self.name = name
self.subprinters = []
self.lookup = {}
self.enabled = True
self.compiled_rx = re.compile('^([a-zA-Z0-9_:]+)(<.*>)?$')
def add(self, name, function):
# A small sanity check.
# FIXME
if not self.compiled_rx.match(name):
raise ValueError('libstdc++ programming error: "%s" does not match' % name)
printer = RxPrinter(name, function)
self.subprinters.append(printer)
self.lookup[name] = printer
# Add a name using _GLIBCXX_BEGIN_NAMESPACE_VERSION.
def add_version(self, base, name, function):
self.add(base + name, function)
if _versioned_namespace:
vbase = re.sub('^(std|__gnu_cxx)::', r'\g<0>%s' % _versioned_namespace, base)
self.add(vbase + name, function)
# Add a name using _GLIBCXX_BEGIN_NAMESPACE_CONTAINER.
def add_container(self, base, name, function):
self.add_version(base, name, function)
self.add_version(base + '__cxx1998::', name, function)
@staticmethod
def get_basic_type(type):
# If it points to a reference, get the reference.
if type.code == gdb.TYPE_CODE_REF:
type = type.target ()
# Get the unqualified type, stripped of typedefs.
type = type.unqualified ().strip_typedefs ()
return type.tag
def __call__(self, val):
typename = self.get_basic_type(val.type)
if not typename:
return None
# All the types we match are template types, so we can use a
# dictionary.
match = self.compiled_rx.match(typename)
if not match:
return None
basename = match.group(1)
if val.type.code == gdb.TYPE_CODE_REF:
if hasattr(gdb.Value,"referenced_value"):
val = val.referenced_value()
if basename in self.lookup:
return self.lookup[basename].invoke(val)
# Cannot find a pretty printer. Return None.
return None
libstdcxx_printer = None
class TemplateTypePrinter(object):
r"""
A type printer for class templates with default template arguments.
Recognizes specializations of class templates and prints them without
any template arguments that use a default template argument.
Type printers are recursively applied to the template arguments.
e.g. replace "std::vector<T, std::allocator<T> >" with "std::vector<T>".
"""
def __init__(self, name, defargs):
self.name = name
self.defargs = defargs
self.enabled = True
class _recognizer(object):
"The recognizer class for TemplateTypePrinter."
def __init__(self, name, defargs):
self.name = name
self.defargs = defargs
# self.type_obj = None
def recognize(self, type_obj):
"""
If type_obj is a specialization of self.name that uses all the
default template arguments for the class template, then return
a string representation of the type without default arguments.
Otherwise, return None.
"""
if type_obj.tag is None:
return None
if not type_obj.tag.startswith(self.name):
return None
template_args = get_template_arg_list(type_obj)
displayed_args = []
require_defaulted = False
for n in range(len(template_args)):
# The actual template argument in the type:
targ = template_args[n]
# The default template argument for the class template:
defarg = self.defargs.get(n)
if defarg is not None:
# Substitute other template arguments into the default:
defarg = defarg.format(*template_args)
# Fail to recognize the type (by returning None)
# unless the actual argument is the same as the default.
try:
if targ != gdb.lookup_type(defarg):
return None
except gdb.error:
# Type lookup failed, just use string comparison:
if targ.tag != defarg:
return None
# All subsequent args must have defaults:
require_defaulted = True
elif require_defaulted:
return None
else:
# Recursively apply recognizers to the template argument
# and add it to the arguments that will be displayed:
displayed_args.append(self._recognize_subtype(targ))
# This assumes no class templates in the nested-name-specifier:
template_name = type_obj.tag[0:type_obj.tag.find('<')]
template_name = strip_inline_namespaces(template_name)
return template_name + '<' + ', '.join(displayed_args) + '>'
def _recognize_subtype(self, type_obj):
"""Convert a gdb.Type to a string by applying recognizers,
or if that fails then simply converting to a string."""
if type_obj.code == gdb.TYPE_CODE_PTR:
return self._recognize_subtype(type_obj.target()) + '*'
if type_obj.code == gdb.TYPE_CODE_ARRAY:
type_str = self._recognize_subtype(type_obj.target())
if str(type_obj.strip_typedefs()).endswith('[]'):
return type_str + '[]' # array of unknown bound
return "%s[%d]" % (type_str, type_obj.range()[1] + 1)
if type_obj.code == gdb.TYPE_CODE_REF:
return self._recognize_subtype(type_obj.target()) + '&'
if hasattr(gdb, 'TYPE_CODE_RVALUE_REF'):
if type_obj.code == gdb.TYPE_CODE_RVALUE_REF:
return self._recognize_subtype(type_obj.target()) + '&&'
type_str = gdb.types.apply_type_recognizers(
gdb.types.get_type_recognizers(), type_obj)
if type_str:
return type_str
return str(type_obj)
def instantiate(self):
"Return a recognizer object for this type printer."
return self._recognizer(self.name, self.defargs)
def add_one_template_type_printer(obj, name, defargs):
r"""
Add a type printer for a class template with default template arguments.
Args:
name (str): The template-name of the class template.
defargs (dict int:string) The default template arguments.
Types in defargs can refer to the Nth template-argument using {N}
(with zero-based indices).
e.g. 'unordered_map' has these defargs:
{ 2: 'std::hash<{0}>',
3: 'std::equal_to<{0}>',
4: 'std::allocator<std::pair<const {0}, {1}> >' }
"""
printer = TemplateTypePrinter('std::'+name, defargs)
gdb.types.register_type_printer(obj, printer)
if _versioned_namespace:
# Add second type printer for same type in versioned namespace:
ns = 'std::' + _versioned_namespace
defargs = { n: d.replace('std::', ns) for n,d in defargs.items() }
printer = TemplateTypePrinter(ns+name, defargs)
gdb.types.register_type_printer(obj, printer)
class FilteringTypePrinter(object):
r"""
A type printer that uses typedef names for common template specializations.
Args:
match (str): The class template to recognize.
name (str): The typedef-name that will be used instead.
Checks if a specialization of the class template 'match' is the same type
as the typedef 'name', and prints it as 'name' instead.
e.g. if an instantiation of std::basic_istream<C, T> is the same type as
std::istream then print it as std::istream.
"""
def __init__(self, match, name):
self.match = match
self.name = name
self.enabled = True
class _recognizer(object):
"The recognizer class for TemplateTypePrinter."
def __init__(self, match, name):
self.match = match
self.name = name
self.type_obj = None
def recognize(self, type_obj):
"""
If type_obj starts with self.match and is the same type as
self.name then return self.name, otherwise None.
"""
if type_obj.tag is None:
return None
if self.type_obj is None:
if not type_obj.tag.startswith(self.match):
# Filter didn't match.
return None
try:
self.type_obj = gdb.lookup_type(self.name).strip_typedefs()
except:
pass
if self.type_obj == type_obj:
return strip_inline_namespaces(self.name)
return None
def instantiate(self):
"Return a recognizer object for this type printer."
return self._recognizer(self.match, self.name)
def add_one_type_printer(obj, match, name):
printer = FilteringTypePrinter('std::' + match, 'std::' + name)
gdb.types.register_type_printer(obj, printer)
if _versioned_namespace:
ns = 'std::' + _versioned_namespace
printer = FilteringTypePrinter(ns + match, ns + name)
gdb.types.register_type_printer(obj, printer)
def register_type_printers(obj):
global _use_type_printing
if not _use_type_printing:
return
# Add type printers for typedefs std::string, std::wstring etc.
for ch in ('', 'w', 'u16', 'u32'):
add_one_type_printer(obj, 'basic_string', ch + 'string')
add_one_type_printer(obj, '__cxx11::basic_string',
'__cxx11::' + ch + 'string')
add_one_type_printer(obj, 'basic_string_view', ch + 'string_view')
# Add type printers for typedefs std::istream, std::wistream etc.
for ch in ('', 'w'):
for x in ('ios', 'streambuf', 'istream', 'ostream', 'iostream',
'filebuf', 'ifstream', 'ofstream', 'fstream'):
add_one_type_printer(obj, 'basic_' + x, ch + x)
for x in ('stringbuf', 'istringstream', 'ostringstream',
'stringstream'):
add_one_type_printer(obj, 'basic_' + x, ch + x)
# <sstream> types are in __cxx11 namespace, but typedefs aren'x:
add_one_type_printer(obj, '__cxx11::basic_' + x, ch + x)
# Add type printers for typedefs regex, wregex, cmatch, wcmatch etc.
for abi in ('', '__cxx11::'):
for ch in ('', 'w'):
add_one_type_printer(obj, abi + 'basic_regex', abi + ch + 'regex')
for ch in ('c', 's', 'wc', 'ws'):
add_one_type_printer(obj, abi + 'match_results', abi + ch + 'match')
for x in ('sub_match', 'regex_iterator', 'regex_token_iterator'):
add_one_type_printer(obj, abi + x, abi + ch + x)
# Note that we can't have a printer for std::wstreampos, because
# it is the same type as std::streampos.
add_one_type_printer(obj, 'fpos', 'streampos')
# Add type printers for <chrono> typedefs.
for dur in ('nanoseconds', 'microseconds', 'milliseconds',
'seconds', 'minutes', 'hours'):
add_one_type_printer(obj, 'duration', dur)
# Add type printers for <random> typedefs.
add_one_type_printer(obj, 'linear_congruential_engine', 'minstd_rand0')
add_one_type_printer(obj, 'linear_congruential_engine', 'minstd_rand')
add_one_type_printer(obj, 'mersenne_twister_engine', 'mt19937')
add_one_type_printer(obj, 'mersenne_twister_engine', 'mt19937_64')
add_one_type_printer(obj, 'subtract_with_carry_engine', 'ranlux24_base')
add_one_type_printer(obj, 'subtract_with_carry_engine', 'ranlux48_base')
add_one_type_printer(obj, 'discard_block_engine', 'ranlux24')
add_one_type_printer(obj, 'discard_block_engine', 'ranlux48')
add_one_type_printer(obj, 'shuffle_order_engine', 'knuth_b')
# Add type printers for experimental::basic_string_view typedefs.
ns = 'experimental::fundamentals_v1::'
for ch in ('', 'w', 'u16', 'u32'):
add_one_type_printer(obj, ns + 'basic_string_view',
ns + ch + 'string_view')
# Do not show defaulted template arguments in class templates.
add_one_template_type_printer(obj, 'unique_ptr',
{ 1: 'std::default_delete<{0}>' })
add_one_template_type_printer(obj, 'deque', { 1: 'std::allocator<{0}>'})
add_one_template_type_printer(obj, 'forward_list', { 1: 'std::allocator<{0}>'})
add_one_template_type_printer(obj, 'list', { 1: 'std::allocator<{0}>'})
add_one_template_type_printer(obj, '__cxx11::list', { 1: 'std::allocator<{0}>'})
add_one_template_type_printer(obj, 'vector', { 1: 'std::allocator<{0}>'})
add_one_template_type_printer(obj, 'map',
{ 2: 'std::less<{0}>',
3: 'std::allocator<std::pair<{0} const, {1}>>' })
add_one_template_type_printer(obj, 'multimap',
{ 2: 'std::less<{0}>',
3: 'std::allocator<std::pair<{0} const, {1}>>' })
add_one_template_type_printer(obj, 'set',
{ 1: 'std::less<{0}>', 2: 'std::allocator<{0}>' })
add_one_template_type_printer(obj, 'multiset',
{ 1: 'std::less<{0}>', 2: 'std::allocator<{0}>' })
add_one_template_type_printer(obj, 'unordered_map',
{ 2: 'std::hash<{0}>',
3: 'std::equal_to<{0}>',
4: 'std::allocator<std::pair<{0} const, {1}>>'})
add_one_template_type_printer(obj, 'unordered_multimap',
{ 2: 'std::hash<{0}>',
3: 'std::equal_to<{0}>',
4: 'std::allocator<std::pair<{0} const, {1}>>'})
add_one_template_type_printer(obj, 'unordered_set',
{ 1: 'std::hash<{0}>',
2: 'std::equal_to<{0}>',
3: 'std::allocator<{0}>'})
add_one_template_type_printer(obj, 'unordered_multiset',
{ 1: 'std::hash<{0}>',
2: 'std::equal_to<{0}>',
3: 'std::allocator<{0}>'})
def register_libstdcxx_printers (obj):
"Register libstdc++ pretty-printers with objfile Obj."
global _use_gdb_pp
global libstdcxx_printer
if _use_gdb_pp:
gdb.printing.register_pretty_printer(obj, libstdcxx_printer)
else:
if obj is None:
obj = gdb
obj.pretty_printers.append(libstdcxx_printer)
register_type_printers(obj)
def build_libstdcxx_dictionary ():
global libstdcxx_printer
libstdcxx_printer = Printer("libstdc++-v6")
# libstdc++ objects requiring pretty-printing.
# In order from:
# http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/a01847.html
libstdcxx_printer.add_version('std::', 'basic_string', StdStringPrinter)
libstdcxx_printer.add_version('std::__cxx11::', 'basic_string', StdStringPrinter)
libstdcxx_printer.add_container('std::', 'bitset', StdBitsetPrinter)
libstdcxx_printer.add_container('std::', 'deque', StdDequePrinter)
libstdcxx_printer.add_container('std::', 'list', StdListPrinter)
libstdcxx_printer.add_container('std::__cxx11::', 'list', StdListPrinter)
libstdcxx_printer.add_container('std::', 'map', StdMapPrinter)
libstdcxx_printer.add_container('std::', 'multimap', StdMapPrinter)
libstdcxx_printer.add_container('std::', 'multiset', StdSetPrinter)
libstdcxx_printer.add_version('std::', 'priority_queue',
StdStackOrQueuePrinter)
libstdcxx_printer.add_version('std::', 'queue', StdStackOrQueuePrinter)
libstdcxx_printer.add_version('std::', 'tuple', StdTuplePrinter)
libstdcxx_printer.add_container('std::', 'set', StdSetPrinter)
libstdcxx_printer.add_version('std::', 'stack', StdStackOrQueuePrinter)
libstdcxx_printer.add_version('std::', 'unique_ptr', UniquePointerPrinter)
libstdcxx_printer.add_container('std::', 'vector', StdVectorPrinter)
# vector<bool>
# Printer registrations for classes compiled with -D_GLIBCXX_DEBUG.
libstdcxx_printer.add('std::__debug::bitset', StdBitsetPrinter)
libstdcxx_printer.add('std::__debug::deque', StdDequePrinter)
libstdcxx_printer.add('std::__debug::list', StdListPrinter)
libstdcxx_printer.add('std::__debug::map', StdMapPrinter)
libstdcxx_printer.add('std::__debug::multimap', StdMapPrinter)
libstdcxx_printer.add('std::__debug::multiset', StdSetPrinter)
libstdcxx_printer.add('std::__debug::priority_queue',
StdStackOrQueuePrinter)
libstdcxx_printer.add('std::__debug::queue', StdStackOrQueuePrinter)
libstdcxx_printer.add('std::__debug::set', StdSetPrinter)
libstdcxx_printer.add('std::__debug::stack', StdStackOrQueuePrinter)
libstdcxx_printer.add('std::__debug::unique_ptr', UniquePointerPrinter)
libstdcxx_printer.add('std::__debug::vector', StdVectorPrinter)
# These are the TR1 and C++11 printers.
# For array - the default GDB pretty-printer seems reasonable.
libstdcxx_printer.add_version('std::', 'shared_ptr', SharedPointerPrinter)
libstdcxx_printer.add_version('std::', 'weak_ptr', SharedPointerPrinter)
libstdcxx_printer.add_container('std::', 'unordered_map',
Tr1UnorderedMapPrinter)
libstdcxx_printer.add_container('std::', 'unordered_set',
Tr1UnorderedSetPrinter)
libstdcxx_printer.add_container('std::', 'unordered_multimap',
Tr1UnorderedMapPrinter)
libstdcxx_printer.add_container('std::', 'unordered_multiset',
Tr1UnorderedSetPrinter)
libstdcxx_printer.add_container('std::', 'forward_list',
StdForwardListPrinter)
libstdcxx_printer.add_version('std::tr1::', 'shared_ptr', SharedPointerPrinter)
libstdcxx_printer.add_version('std::tr1::', 'weak_ptr', SharedPointerPrinter)
libstdcxx_printer.add_version('std::tr1::', 'unordered_map',
Tr1UnorderedMapPrinter)
libstdcxx_printer.add_version('std::tr1::', 'unordered_set',
Tr1UnorderedSetPrinter)
libstdcxx_printer.add_version('std::tr1::', 'unordered_multimap',
Tr1UnorderedMapPrinter)
libstdcxx_printer.add_version('std::tr1::', 'unordered_multiset',
Tr1UnorderedSetPrinter)
# These are the C++11 printer registrations for -D_GLIBCXX_DEBUG cases.
# The tr1 namespace containers do not have any debug equivalents,
# so do not register printers for them.
libstdcxx_printer.add('std::__debug::unordered_map',
Tr1UnorderedMapPrinter)
libstdcxx_printer.add('std::__debug::unordered_set',
Tr1UnorderedSetPrinter)
libstdcxx_printer.add('std::__debug::unordered_multimap',
Tr1UnorderedMapPrinter)
libstdcxx_printer.add('std::__debug::unordered_multiset',
Tr1UnorderedSetPrinter)
libstdcxx_printer.add('std::__debug::forward_list',
StdForwardListPrinter)
# Library Fundamentals TS components
libstdcxx_printer.add_version('std::experimental::fundamentals_v1::',
'any', StdExpAnyPrinter)
libstdcxx_printer.add_version('std::experimental::fundamentals_v1::',
'optional', StdExpOptionalPrinter)
libstdcxx_printer.add_version('std::experimental::fundamentals_v1::',
'basic_string_view', StdExpStringViewPrinter)
# Filesystem TS components
libstdcxx_printer.add_version('std::experimental::filesystem::v1::',
'path', StdExpPathPrinter)
libstdcxx_printer.add_version('std::experimental::filesystem::v1::__cxx11::',
'path', StdExpPathPrinter)
libstdcxx_printer.add_version('std::filesystem::',
'path', StdExpPathPrinter)
libstdcxx_printer.add_version('std::filesystem::__cxx11::',
'path', StdExpPathPrinter)
# C++17 components
libstdcxx_printer.add_version('std::',
'any', StdExpAnyPrinter)
libstdcxx_printer.add_version('std::',
'optional', StdExpOptionalPrinter)
libstdcxx_printer.add_version('std::',
'basic_string_view', StdExpStringViewPrinter)
libstdcxx_printer.add_version('std::',
'variant', StdVariantPrinter)
libstdcxx_printer.add_version('std::',
'_Node_handle', StdNodeHandlePrinter)
# Extensions.
libstdcxx_printer.add_version('__gnu_cxx::', 'slist', StdSlistPrinter)
if True:
# These shouldn't be necessary, if GDB "print *i" worked.
# But it often doesn't, so here they are.
libstdcxx_printer.add_container('std::', '_List_iterator',
StdListIteratorPrinter)
libstdcxx_printer.add_container('std::', '_List_const_iterator',
StdListIteratorPrinter)
libstdcxx_printer.add_version('std::', '_Rb_tree_iterator',
StdRbtreeIteratorPrinter)
libstdcxx_printer.add_version('std::', '_Rb_tree_const_iterator',
StdRbtreeIteratorPrinter)
libstdcxx_printer.add_container('std::', '_Deque_iterator',
StdDequeIteratorPrinter)
libstdcxx_printer.add_container('std::', '_Deque_const_iterator',
StdDequeIteratorPrinter)
libstdcxx_printer.add_version('__gnu_cxx::', '__normal_iterator',
StdVectorIteratorPrinter)
libstdcxx_printer.add_version('__gnu_cxx::', '_Slist_iterator',
StdSlistIteratorPrinter)
libstdcxx_printer.add_container('std::', '_Fwd_list_iterator',
StdFwdListIteratorPrinter)
libstdcxx_printer.add_container('std::', '_Fwd_list_const_iterator',
StdFwdListIteratorPrinter)
# Debug (compiled with -D_GLIBCXX_DEBUG) printer
# registrations.
libstdcxx_printer.add('__gnu_debug::_Safe_iterator',
StdDebugIteratorPrinter)
build_libstdcxx_dictionary ()
|