asmith added inline comments.
================
Comment at: source/Plugins/SymbolFile/PDB/SymbolFilePDB.cpp:392-399
+ bool is_regex = false;
+ if (name_str.find_first_of("[]?*.-+\\") != std::string::npos) {
+ // Trying to compile an invalid regex could throw an exception.
+ // Only search by regex when it's valid.
+ lldb_private::RegularExpression name_regex(name_str);
+ is_regex = name_regex.IsValid();
+ }
----------------
zturner wrote:
> I can see two possible problems here.
>
> 1. Now if it is a valid regex, it's going to compile it twice, hurting
> performance (not sure by how much, it could be negligible)
>
> 2. Whether or not it's valid is determined by asking LLDB's regex engine, but
> it's then compiled with C++ STL's engine. It's possible they won't agree on
> whether or not a regex is valid.
>
> You mentioned that it throws an exception on an invalid regex. What actually
> happens though? Because we compile with exception support disabled. Does it
> terminate the program?
>
> At a minimum, the validity check and the find function should agree on the
> regex engine. If the only way to make that work is to change from
> `std::regex` to `lldb_private::RegularExpression` as the matching engine,
> then I guess we have to do that.
How about this?
```
lldb_private::RegularExpression name_regex(name_str);
if (name_regex.IsValid())
FindTypesByRegex(name_regex, max_matches, types); // pass regex here
else
FindTypesByName(name_str, max_matches, types);
return types.GetSize();
}
void SymbolFilePDB::FindTypesByRegex(lldb_private::RegularExpression ®ex,
uint32_t max_matches,
lldb_private::TypeMap &types) {
```
Repository:
rL LLVM
https://reviews.llvm.org/D41086
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