[llvm-dev] RFC: Adding a JSON library to LLVM Support

[Sam McCall via llvm-dev]

We don't have a dedicated JSON library in the LLVM tree, I'd like to add
one. The pressing need is for clangd, but we have other tools that
read/write JSON too.

I'm proposing we write a new one, rather than importing a third-party
library (licensing/integration reasons), on or extending YamlParser/YamlIO
(usability/flexibility). I lean towards a design that parses a full DOM at
once, and provides literal-like syntax for composing documents.

I've written a document laying out the reasons for taking this path, and my
proposal for a design (with links to a prototype)
https://docs.google.com/document/d/1OEF9IauWwNuSigZzvvbjc1cVS1uGHRyGTXaoy3DjqM4/edit
(Comments are enabled, but high-level discussion probably belongs on the
list instead.)

What do you think? I'm particularly interested in which parts of LLVM
produce/consume JSON (or might want to), and what they need. I'm mostly
familiar with the stuff in clang-tools-extra.

Cheers, Sam
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