[libcxxabi] [lldb] [llvm] [lldb] Add frame-format option to highlight function names in backtraces (PR #131836)

[Michael Buch via llvm-commits]

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@@ -2074,6 +2076,64 @@ static const Definition *FindEntry(const llvm::StringRef &format_str,
   return parent;
 }
 
+/// Parses a single highlighting format specifier.
+///
+/// Example syntax for such specifier:
+/// \code
+/// ${function.name-with-args:%highlight_basename(ansi.fg.green)}
----------------
Michael137 wrote:

> Does the setting affect the format of the whole frame, or just the function name. Because if it's the latter (which I also think would be a better design), then it probably should be called something else... function-format, function-name-format, ... ?

Yup it just affects the function name. I renamed it to `function-name-format`

> Shouldn't that be plugin.language.cplusplus.frame-format?

That would've been my preferred order too. But currently the setting names for plugins are derived as:
```
plugin.<plugin name>.<setting name>.<property>
```
For `CPlusPlusLanguage`, the plugin name is `cplusplus`. So i decided to call the settings for it `language` (for the lack of a better settings name). Any suggestions for what the `<setting name>` should be here?

https://github.com/llvm/llvm-project/pull/131836