llvm-project.git/lldb/test/Shell/ObjectFile/PDB, branch main Unnamed repository; edit this file 'description' to name the repository. [LLDB][PDB] Fix age field in UUID in PDB file. 2023-06-06T15:24:50+00:00 Zequan Wu zequanwu@google.com 2023-06-05T19:07:06+00:00 cb9a7c22ee6789569e28dde073e6827761b4d003 There are two age fields in a PDB file. One from the PDB Stream and another one from the DBI stream. According to https://randomascii.wordpress.com/2011/11/11/source-indexing-is-underused-awesomeness/#comment-34328, The age in DBI stream is used to against the binary's age. `Pdbstr.exe` is used to only increment the age from PDB stream without changing the DBI age. I also verified this by manually changing the DBI age of a PDB file and let `windbg.exe` to load it. It shows the following logs before and after changing: Before: ``` SYMSRV: BYINDEX: 0xA c:\symbols*https://msdl.microsoft.com/download/symbols nlaapi.pdb D72AA69CD5ABE5D28C74FADB17DE3F8C1 SYMSRV: PATH: c:\symbols\nlaapi.pdb\D72AA69CD5ABE5D28C74FADB17DE3F8C1\nlaapi.pdb SYMSRV: RESULT: 0x00000000 *** WARNING: Unable to verify checksum for NLAapi.dll DBGHELP: NLAapi - public symbols c:\symbols\nlaapi.pdb\D72AA69CD5ABE5D28C74FADB17DE3F8C1\nlaapi.pdb ... ``` After: ``` SYMSRV: BYINDEX: 0xA c:\symbols*https://msdl.microsoft.com/download/symbols nlaapi.pdb D72AA69CD5ABE5D28C74FADB17DE3F8C1 SYMSRV: PATH: c:\symbols\nlaapi.pdb\D72AA69CD5ABE5D28C74FADB17DE3F8C1\nlaapi.pdb SYMSRV: RESULT: 0x00000000 DBGHELP: c:\symbols\nlaapi.pdb\D72AA69CD5ABE5D28C74FADB17DE3F8C1\nlaapi.pdb - mismatched pdb SYMSRV: BYINDEX: 0xB c:\symbols*https://chromium-browser-symsrv.commondatastorage.googleapis.com nlaapi.pdb D72AA69CD5ABE5D28C74FADB17DE3F8C1 SYMSRV: PATH: c:\symbols\nlaapi.pdb\D72AA69CD5ABE5D28C74FADB17DE3F8C1\nlaapi.pdb SYMSRV: RESULT: 0x00000000 DBGHELP: c:\symbols\nlaapi.pdb\D72AA69CD5ABE5D28C74FADB17DE3F8C1\nlaapi.pdb - mismatched pdb SYMSRV: BYINDEX: 0xC c:\src\symbols*https://msdl.microsoft.com/download/symbols nlaapi.pdb D72AA69CD5ABE5D28C74FADB17DE3F8C1 SYMSRV: PATH: c:\src\symbols\nlaapi.pdb\D72AA69CD5ABE5D28C74FADB17DE3F8C1\nlaapi.pdb SYMSRV: RESULT: 0x00000000 *** WARNING: Unable to verify checksum for NLAapi.dll DBGHELP: NLAapi - public symbols c:\src\symbols\nlaapi.pdb\D72AA69CD5ABE5D28C74FADB17DE3F8C1\nlaapi.pdb ``` So, `windbg.exe` uses the DBI age to detect mismatched pdb, but it still loads the pdb even if the age mismatched. Probably lldb should do the same and give some warnings. This fixes a bug that lldb can't load some windows system pdbs due to mismatched uuid. Reviewed By: rnk Differential Revision: https://reviews.llvm.org/D152189 
There are two age fields in a PDB file. One from the PDB Stream and another one
from the DBI stream.

According to https://randomascii.wordpress.com/2011/11/11/source-indexing-is-underused-awesomeness/#comment-34328,
The age in DBI stream is used to against the binary's age. `Pdbstr.exe` is used
to only increment the age from PDB stream without changing the DBI age. I
also verified this by manually changing the DBI age of a PDB file and let
`windbg.exe` to load it. It shows the following logs before and after changing:

Before:
```
SYMSRV:  BYINDEX: 0xA
         c:\symbols*https://msdl.microsoft.com/download/symbols
         nlaapi.pdb
         D72AA69CD5ABE5D28C74FADB17DE3F8C1
SYMSRV:  PATH: c:\symbols\nlaapi.pdb\D72AA69CD5ABE5D28C74FADB17DE3F8C1\nlaapi.pdb
SYMSRV:  RESULT: 0x00000000
*** WARNING: Unable to verify checksum for NLAapi.dll
DBGHELP: NLAapi - public symbols
        c:\symbols\nlaapi.pdb\D72AA69CD5ABE5D28C74FADB17DE3F8C1\nlaapi.pdb
...
```

After:
```
SYMSRV:  BYINDEX: 0xA
         c:\symbols*https://msdl.microsoft.com/download/symbols
         nlaapi.pdb
         D72AA69CD5ABE5D28C74FADB17DE3F8C1
SYMSRV:  PATH: c:\symbols\nlaapi.pdb\D72AA69CD5ABE5D28C74FADB17DE3F8C1\nlaapi.pdb
SYMSRV:  RESULT: 0x00000000
DBGHELP: c:\symbols\nlaapi.pdb\D72AA69CD5ABE5D28C74FADB17DE3F8C1\nlaapi.pdb - mismatched pdb
SYMSRV:  BYINDEX: 0xB
         c:\symbols*https://chromium-browser-symsrv.commondatastorage.googleapis.com
         nlaapi.pdb
         D72AA69CD5ABE5D28C74FADB17DE3F8C1
SYMSRV:  PATH: c:\symbols\nlaapi.pdb\D72AA69CD5ABE5D28C74FADB17DE3F8C1\nlaapi.pdb
SYMSRV:  RESULT: 0x00000000
DBGHELP: c:\symbols\nlaapi.pdb\D72AA69CD5ABE5D28C74FADB17DE3F8C1\nlaapi.pdb - mismatched pdb
SYMSRV:  BYINDEX: 0xC
         c:\src\symbols*https://msdl.microsoft.com/download/symbols
         nlaapi.pdb
         D72AA69CD5ABE5D28C74FADB17DE3F8C1
SYMSRV:  PATH: c:\src\symbols\nlaapi.pdb\D72AA69CD5ABE5D28C74FADB17DE3F8C1\nlaapi.pdb
SYMSRV:  RESULT: 0x00000000
*** WARNING: Unable to verify checksum for NLAapi.dll
DBGHELP: NLAapi - public symbols
        c:\src\symbols\nlaapi.pdb\D72AA69CD5ABE5D28C74FADB17DE3F8C1\nlaapi.pdb
```

So, `windbg.exe` uses the DBI age to detect mismatched pdb, but it still loads
the pdb even if the age mismatched. Probably lldb should do the same and give
some warnings.

This fixes a bug that lldb can't load some windows system pdbs due to mismatched
uuid.

Reviewed By: rnk

Differential Revision: https://reviews.llvm.org/D152189
[lldb] Update object.test after 'nosync' inference was enabled. 2021-04-09T08:04:15+00:00 Alexander Belyaev pifon@google.com 2021-04-09T08:02:24+00:00 39ae25fb8c648b0e710ba2d2d46e7a5b7fafff19 https://reviews.llvm.org/D99769 
https://reviews.llvm.org/D99769
[lldb][PDB] Add ObjectFile PDB plugin 2020-10-26T17:28:48+00:00 Zequan Wu zequanwu@google.com 2020-10-20T18:15:42+00:00 242e1e9910441ad00118e580e4cbd5743c77ea5e To allow loading PDB file with `target symbols add` command. Differential Revision: https://reviews.llvm.org/D89812 
To allow loading PDB file with `target symbols add` command.

Differential Revision: https://reviews.llvm.org/D89812