kastiglione added inline comments.
================
Comment at: lldb/examples/python/crashlog.py:669
+ r'(0x[0-9a-fA-F]{4,}) +' # addr (4
chars or more)
+ r'((.*)(?:(?: +\+ +)([0-9]+))|[^\s]+)' # symbol +
offset
)
----------------
mib wrote:
> kastiglione wrote:
> > mib wrote:
> > > @kastiglione may be you have a better idea how to handle `symbol +
> > > offset` where ` + offset` might be optional.
> > symbol is always present?
> Technically, in the past the `offs` (symbol + offset) was optional:
> ```
> r'(?: +(.*))?'
> ```
> So I guess `symbol` could be missing.
Breaking it down, there is:
1. a symbol (maybe)
2. the literal text " + " followed by a number (also maybe)
I'll start start with 2:
```
\+ (\d+)
```
For the symbol, `.*`, it should instead have at least a length of 1. I'd use
`+` instead of `*`. And, it shouldn't be _any_ character. At the very least it
should be non-space, which is `\S`.
To combine these at a high level it looks like:
```
(?:(<symbol>)(?:<offset>)?)?
```
Filling in these two with symbol='\S+' and offset=' \+ (\d+)', it becomes:
```
(?:(\S+)(?: \+ (\d+))?)?
```
Here's some python real session that minimally exercises this code:
```
% python
>>> import re
>>> pat = re.compile(r"(?:(\S+)(?: \+ (\d+))?)?")
>>> pat.match("func + 123").groups()
('func', '123')
>>> pat.match("func").groups()
('func', None)
>>> pat.match("").groups()
(None, None)
>>>
```
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D146765/new/
https://reviews.llvm.org/D146765
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