1455068 - rustc still generating debug information causing msdia.dll to throw exceptions

Status: NEW

(Firefox Build System :: General, defect)

Description

[Nathan Froyd [:froydnj]]

I am trying to use SymbolSort to analyze some size issues on Windows.  Running SymbolSort on a xul.pbd from mozilla-central gives:

$ ./SymbolSort.exe -in xul.pdb -out f.txt
Loading symbols from xul.pdb
Reading section info...
Reading source file info...
Reading global function symbols...  15% complete
Unhandled Exception: System.DivideByZeroException: Attempted to divide by zero.
   at Dia2Lib.IDiaSymbol.get_undecoratedName()
   at SymbolSort.SymbolSort.ReadSymbolsFromScope(IDiaSymbol parent, SymTagEnum type, SymbolFlags additionalFlags, UInt32 startPercent, UInt32 endPercent, IDiaSession diaSession, List`1 sectionContribs, Dictionary`2 compilandFileMap, List`1 symbols) in C:\Users\froyd\SymbolSort-master\SymbolSort.cs:line 919
   at SymbolSort.SymbolSort.ReadSymbolsFromPDB(List`1 symbols, String filename, String searchPath, Options options) in C:\Users\froyd\SymbolSort-master\SymbolSort.cs:line 1188
   at SymbolSort.SymbolSort.Main(String[] args) in C:\Users\froyd\SymbolSort-master\SymbolSort.cs:line 1777

which is aggravating.  I discovered bug 1343625 worked around this for our own symbol dumping purposes, and https://github.com/rust-lang/rust/pull/42803 was supposed to fix it in upstream Rust, but it seems that the bug is still present in whatever version of Rust we use to compile m-c with.

I think I can work around this in SymbolSort itself, but it would obviously be nicer if this was fixed upstream.  Michael, should I file a Rust bug report for you?

Comment 1

[Michael Woerister]

Thanks for the investigation, Nathan! Yes, please open an issue in the Rust repo.