Introducing the Systemtap Language-server

[Martin Cermak]

On  Mon  2023-02-06  10:47 , Martin Cermak wrote:
> On  Fri  2023-02-03  15:06 , Ryan Goldberg via Systemtap wrote:
> > Hi all,
> > 
> > A new language-server [0] mode has recently been added to systemtap. The
> > language-server, which runs as a child of an lsp-client [1], serves up
> > code-completion suggestions.
> > 
> > The language-server-protocol uses jsonrpc [2] and we developed our own C++
> > SDK which both implements jsonrpc and allows for the creation of
> > language-servers.
> > 
> > We use systemtap's pass 1 machinery in order to lex and parse
> > code-completion requests and then use the termination state to determine
> > the completion results as well as some metadata (such as the result type).
> > Further deriving these allows us to provide additional context-specific
> > completion results such as context variables within applicable probe
> > statement blocks or string completions within probe components. The server
> > also provides completions for globals, functions and macros from both
> > within the script and from the tapsets.
> > 
> > The language server can be run with "stap --language-server" and should be
> > started by a language-server client as the data is currently transferred
> > via stdin/stdout. We have currently been testing with vim, emacs, vscode,
> > jupyter and eclipse. Take a look at language-server/README.md for client
> > specific usage instructions.
> > 
> > For more information I'll be releasing a blog post later this year
> > describing the jupyter-notebook use case of the language-server. If you
> > have any feedback, I'd be happy to hear it.
> 
> Hi Ryan, the source doesn't compile on RHEL.  RHEL9 currently only
> has json-c-devel-0.14 which doesn't provide json_object_new_array_ext().
> It only las json_object_new_array()  This seems to be the only
> compilation problem on RHEL9.
> 
> However, systemtap is also supposed to work with RHEL8, where I
> seem to see more compile time issues.  Please, check.  I'm happy
> to provide a test box for you if interested.

... thanks, for the fixes;  Works great for me now!

Martin