[PATCH] D40132: [clangd] Tracing improvements

[Sam McCall via Phabricator via cfe-commits]

sammccall created this revision.

[clangd] Tracing improvements

Compose JSON using JSONExpr
Allow attaching metadata to spans (and avoid it if tracing is off)
Attach IDs and responses of JSON RPCs to their spans

The downside is that large responses make the trace viewer sluggish.
We should make our responses less huge :-) Or fix trace viewer.


https://reviews.llvm.org/D40132

Files:
  clangd/ClangdUnit.cpp
  clangd/JSONRPCDispatcher.cpp
  clangd/JSONRPCDispatcher.h
  clangd/Trace.cpp
  clangd/Trace.h
  clangd/tool/ClangdMain.cpp
  test/clangd/trace.test
  unittests/clangd/TraceTests.cpp

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