I have the following gcroot output:
(lldb) gcroot 0x00007FC1EB641670
HandleTable:
00007FC3900B1388 (pinned handle)
-> 00007FC278027028 System.Object[]
-> 00007FC1E82CF848 System.Collections.Concurrent.ConcurrentDictionary`2[[Dapper.SqlMapper+Identity, Dapper.StrongName],[Dapper.SqlMapper+CacheInfo, Dapper.StrongName]]
-> 00007FBEEAA5E998 System.Collections.Concurrent.ConcurrentDictionary`2+Tables[[Dapper.SqlMapper+Identity, Dapper.StrongName],[Dapper.SqlMapper+CacheInfo, Dapper.StrongName]]
-> 00007FBEEAA51000 System.Collections.Concurrent.ConcurrentDictionary`2+Node[[Dapper.SqlMapper+Identity, Dapper.StrongName],[Dapper.SqlMapper+CacheInfo, Dapper.StrongName]][]
-> 00007FBE6BCB00C0 System.Collections.Concurrent.ConcurrentDictionary`2+Node[[Dapper.SqlMapper+Identity, Dapper.StrongName],[Dapper.SqlMapper+CacheInfo, Dapper.StrongName]]
-> 00007FBE6BCAFFA0 Dapper.SqlMapper+Identity
-> 00007FC1EB641670 System.String
Found 1 unique roots (run 'gcroot -all' to see all roots).
What is the meaning of the address 00007FC3900B1388? How can I locate the relevant logic in the code?
EDIT 1
The System.Object[] object at 00007FC278027028 takes 130584 bytes:
(lldb) dumpobj 00007FC278027028
Name: System.Object[]
MethodTable: 00007fc315075510
EEClass: 00007fc315075488
Size: 130584(0x1fe18) bytes
Array: Rank 1, Number of elements 16320, Type CLASS
I.e. it must be on LOH.
Please, find below the output of eeheap -gc
Number of GC Heaps: 8
------------------------------
Heap 0 (000000000125D930)
generation 0 starts at 0x00007FBE89EA6AA0
generation 1 starts at 0x00007FBE8895C1B0
generation 2 starts at 0x00007FBE67FFF000
ephemeral segment allocation context: none
segment begin allocated committed allocated size committed size
00007FBE67FFE000 00007FBE67FFF000 00007FBE8A4DD0A8 00007FBE94E3F000 0x224de0a8(575529128) 0x2ce40000(753139712)
Large object heap starts at 0x00007FC267FFF000
segment begin allocated committed allocated size committed size
00007FC267FFE000 00007FC267FFF000 00007FC277C6C938 00007FC277C8D000 0xfc6d938(264689976) 0xfc8e000(264822784)
00007FBCB442A000 00007FBCB442B000 00007FBCB51FCA48 00007FBCB51FD000 0xdd1a48(14490184) 0xdd2000(14491648)
Allocated Heap Size: Size: 0x32f1d428 (854709288) bytes.
Committed Heap Size: Size: 0x3d8a0000 (1032454144) bytes.
------------------------------
Heap 1 (0000000001265A20)
generation 0 starts at 0x00007FBF06D4BB48
generation 1 starts at 0x00007FBF0594AB08
generation 2 starts at 0x00007FBEE7FFF000
ephemeral segment allocation context: none
segment begin allocated committed allocated size committed size
00007FBEE7FFE000 00007FBEE7FFF000 00007FBF0766C740 00007FBF11B4B000 0x1f66d740(526833472) 0x29b4c000(699711488)
Large object heap starts at 0x00007FC277FFF000
segment begin allocated committed allocated size committed size
00007FC277FFE000 00007FC277FFF000 00007FC287F9DFF0 00007FC287FF5000 0xff9eff0(268038128) 0xfff6000(268394496)
00007FBC84424000 00007FBC84425000 00007FBC84EA2150 00007FBC84EA3000 0xa7d150(10998096) 0xa7e000(11001856)
Allocated Heap Size: Size: 0x30089880 (805869696) bytes.
Committed Heap Size: Size: 0x3a5c0000 (979107840) bytes.
------------------------------
Heap 2 (000000000126D8A0)
generation 0 starts at 0x00007FBF89893538
generation 1 starts at 0x00007FBF88849088
generation 2 starts at 0x00007FBF67FFF000
ephemeral segment allocation context: none
segment begin allocated committed allocated size committed size
00007FBF67FFE000 00007FBF67FFF000 00007FBF89EC4EB8 00007FBF94ADD000 0x21ec5eb8(569138872) 0x2cade000(749592576)
Large object heap starts at 0x00007FC287FFF000
segment begin allocated committed allocated size committed size
00007FC287FFE000 00007FC287FFF000 00007FC297FF8718 00007FC297FF9000 0xfff9718(268408600) 0xfffa000(268410880)
00007FBCE4430000 00007FBCE4431000 00007FBCE53E9098 00007FBCE53EA000 0xfb8098(16482456) 0xfb9000(16486400)
Allocated Heap Size: Size: 0x32e77668 (854029928) bytes.
Committed Heap Size: Size: 0x3da91000 (1034489856) bytes.
------------------------------
Heap 3 (0000000001275720)
generation 0 starts at 0x00007FC0079EF878
generation 1 starts at 0x00007FC006993E30
generation 2 starts at 0x00007FBFE7FFF000
ephemeral segment allocation context: none
segment begin allocated committed allocated size committed size
00007FBFE7FFE000 00007FBFE7FFF000 00007FC00C09B238 00007FC013259000 0x2409c238(604619320) 0x2b25a000(723886080)
Large object heap starts at 0x00007FC297FFF000
segment begin allocated committed allocated size committed size
00007FC297FFE000 00007FC297FFF000 00007FC2A7E5CBC0 00007FC2A7E7D000 0xfe5dbc0(266722240) 0xfe7e000(266854400)
00007FBCF4432000 00007FBCF4433000 00007FBCF55AB6D8 00007FBCF55CC000 0x11786d8(18319064) 0x1199000(18452480)
Allocated Heap Size: Size: 0x350724d0 (889660624) bytes.
Committed Heap Size: Size: 0x3c271000 (1009192960) bytes.
------------------------------
Heap 4 (000000000127D5A0)
generation 0 starts at 0x00007FC088CAE0B0
generation 1 starts at 0x00007FC087A4C4E8
generation 2 starts at 0x00007FC067FFF000
ephemeral segment allocation context: none
segment begin allocated committed allocated size committed size
00007FC067FFE000 00007FC067FFF000 00007FC08AC581F0 00007FC093EA6000 0x22c591f0(583373296) 0x2bea7000(736784384)
Large object heap starts at 0x00007FC2A7FFF000
segment begin allocated committed allocated size committed size
00007FC2A7FFE000 00007FC2A7FFF000 00007FC2B7F24C40 00007FC2B7F45000 0xff25c40(267541568) 0xff46000(267673600)
00007FBD237BE000 00007FBD237BF000 00007FBD24FBC270 00007FBD24FBD000 0x17fd270(25154160) 0x17fe000(25157632)
Allocated Heap Size: Size: 0x3437c0a0 (876069024) bytes.
Committed Heap Size: Size: 0x3d5eb000 (1029615616) bytes.
------------------------------
Heap 5 (0000000001285420)
generation 0 starts at 0x00007FC1097B5D90
generation 1 starts at 0x00007FC10872DB10
generation 2 starts at 0x00007FC0E7FFF000
ephemeral segment allocation context: none
segment begin allocated committed allocated size committed size
00007FC0E7FFE000 00007FC0E7FFF000 00007FC10DAD4388 00007FC114D2C000 0x25ad5388(632116104) 0x2cd2d000(752013312)
Large object heap starts at 0x00007FC2B7FFF000
segment begin allocated committed allocated size committed size
00007FC2B7FFE000 00007FC2B7FFF000 00007FC2C7DD3C68 00007FC2C7DF4000 0xfdd4c68(266161256) 0xfdf5000(266293248)
00007FBC74422000 00007FBC74423000 00007FBC74AD9BA0 00007FBC74ADA000 0x6b6ba0(7039904) 0x6b7000(7041024)
Allocated Heap Size: Size: 0x35f60b90 (905317264) bytes.
Committed Heap Size: Size: 0x3d1d9000 (1025347584) bytes.
------------------------------
Heap 6 (000000000128D2A0)
generation 0 starts at 0x00007FC1887CB3E0
generation 1 starts at 0x00007FC1877EFF98
generation 2 starts at 0x00007FC167FFF000
ephemeral segment allocation context: none
segment begin allocated committed allocated size committed size
00007FC167FFE000 00007FC167FFF000 00007FC18A95FE60 00007FC193A66000 0x22960e60(580259424) 0x2ba67000(732327936)
Large object heap starts at 0x00007FC2C7FFF000
segment begin allocated committed allocated size committed size
00007FC2C7FFE000 00007FC2C7FFF000 00007FC2D7F7E3F8 00007FC2D7FD5000 0xff7f3f8(267908088) 0xffd6000(268263424)
00007FBCD442E000 00007FBCD442F000 00007FBCD52B9180 00007FBCD52BA000 0xe8a180(15245696) 0xe8b000(15249408)
Allocated Heap Size: Size: 0x3376a3d8 (863413208) bytes.
Committed Heap Size: Size: 0x3c8c8000 (1015840768) bytes.
------------------------------
Heap 7 (0000000001295120)
generation 0 starts at 0x00007FC2086004E0
generation 1 starts at 0x00007FC2075711A8
generation 2 starts at 0x00007FC1E7FFF000
ephemeral segment allocation context: none
segment begin allocated committed allocated size committed size
00007FC1E7FFE000 00007FC1E7FFF000 00007FC20879C120 00007FC213FA3000 0x2079d120(544854304) 0x2bfa4000(737820672)
Large object heap starts at 0x00007FC2D7FFF000
segment begin allocated committed allocated size committed size
00007FC2D7FFE000 00007FC2D7FFF000 00007FC2E7F465B8 00007FC2E7F67000 0xff475b8(267679160) 0xff68000(267812864)
00007FBCC442C000 00007FBCC442D000 00007FBCC514E798 00007FBCC51A5000 0xd21798(13768600) 0xd78000(14123008)
Allocated Heap Size: Size: 0x31405e70 (826302064) bytes.
Committed Heap Size: Size: 0x3cc84000 (1019756544) bytes.
------------------------------
GC Allocated Heap Size: Size: 0x199cdd658 (6875371096) bytes.
GC Committed Heap Size: Size: 0x1e5872000 (8145805312) bytes.
The pinned handle value is 0x00007FC3900B1388. I am not sure how to compute the range that owns it. I do not see any numbers that produce a range that covers 0x00007FC3900B1388.
BTW, I have found the relevant static inside the Dapper.SqlMapper class:
public static class SqlMapper
{
...
private static readonly ConcurrentDictionary<Identity, CacheInfo> _queryCache;
}
https://github.com/DapperLib/Dapper/blob/ca00feeb5fafe5262166689c0bec2b80b53add4e/Dapper/SqlMapper.cs#L59