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line_maps instances such as the global line_table are GC-managed, but the htab within location_adhoc_data_map.htab is not GC-managed. Previously this was deleted manually by a call to location_adhoc_data_fini within toplev::main. However, on adding a call to forcibly_ggc_collect after the selftests, all of the htabs for the various line_tables created during the selftests start showing up as leaks in "make selftest-valgrind", e.g.: 13,536 (1,344 direct, 12,192 indirect) bytes in 12 blocks are definitely lost in loss record 1,065 of 1,086 at 0x4A081D4: calloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) by 0x16DB3B0: xcalloc (xmalloc.c:163) by 0x16D8D34: htab_create_typed_alloc (hashtab.c:358) by 0x16D8DBD: htab_create_alloc (hashtab.c:286) by 0x16A2CCC: linemap_init(line_maps*, unsigned int) (line-map.c:353) by 0x1685605: selftest::line_table_test::line_table_test(selftest::line_table_case const&) (input.c:1624) by 0x167D09C: selftest::test_applying_fixits_modernize_named_init(selftest::line_table_case const&) (edit-context.c:1430) by 0x1686827: selftest::for_each_line_table_case(void (*)(selftest::line_table_case const&)) (input.c:3227) by 0x167F067: selftest::edit_context_c_tests() (edit-context.c:1658) by 0x1616E67: selftest::run_tests() (selftest-run-tests.c:71) by 0xC0DB25: toplev::run_self_tests() (toplev.c:2076) by 0x618EB4: toplev::main(int, char**) (toplev.c:2153) This patch removes the manual one-time cleanup in favor of adding a destructor to class line_maps, which cleans up the non-GC-managed htab. Doing so improves "make selftest-valgrind" from: ==61118== LEAK SUMMARY: ==61118== definitely lost: 121,248 bytes in 1,515 blocks ==61118== indirectly lost: 974,344 bytes in 959 blocks ==61118== possibly lost: 0 bytes in 0 blocks ==61118== still reachable: 1,332,599 bytes in 3,684 blocks ==61118== suppressed: 0 bytes in 0 blocks to: ==57182== LEAK SUMMARY: ==57182== definitely lost: 13,840 bytes in 556 blocks ==57182== indirectly lost: 0 bytes in 0 blocks ==57182== possibly lost: 0 bytes in 0 blocks ==57182== still reachable: 1,355,703 bytes in 3,684 blocks ==57182== suppressed: 0 bytes in 0 blocks gcc/ChangeLog: * toplev.c (toplev::main): Remove call to location_adhoc_data_fini. libcpp/ChangeLog: * include/line-map.h (line_maps::~line_maps): New dtor. (location_adhoc_data_fini): Delete decl. * line-map.c (line_maps::~line_maps): New dtor. (location_adhoc_data_fini): Delete. From-SVN: r241533
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