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Pepe Iborra 0d4e3b9499
Fix diagnostics update bug (#959) 
* Preventively switch to uninterruptible mask in withMVar'

withMVar' is used to update the shakeSession var and it's crucial that the
third argument is not interrupted.

'mask' can still be interrupted for I/O actions and, while we were careful to
ensure none was used, if it ever breaks it will lead to very hard to debug
problems.

* refactor: move to RuleTypes

* Add a TestRequest to wait for arbitrary ide actions

Closes #955

* expectCurrentDiagnostics

* Add a test suite for cancellation

* Introduce --test-no-kick to fix cancellation tests reliability

* delete unsafeClearDiagnostics (unused)

* GetModSummaryWithoutTimestamps - remove StringBuffer

Since the contents of the buffer are not tracked by the fingerprint.

* Fix diagnostics bug

Given a FOI F with non null typechecking diagnostics D, imagine the following scenario:

1. An edit notification for F is received, creating a new version
2. GetModTime is executed, producing 0 diagnostics.
  2.1 updateFileDiagnostics is called
  2.2 setStageDiagnostics is called
  2.3 LSP.updateDiagnostics is called with a new version, resetting all the
  diagnostics for F
  2.4 newDiags=[] in updateFileDiagnostics, which is different from D (the last
  published diagnostics), which enqueues a new publishDiagnostics [] in the
  Debouncer
3. An edit notification for F is received before typechecking has a chance to
run which undoes the previous edit
4. The debouncer publishes the empty set of diagnostics after waiting 0.1s
5. GetFileContents runs and since the contents of the file haven't changed since
the last time it ran, early cutoff skips everything donwstream

Since TypeCheck is skipped, the empty set of diagnostics stays published until
another edit comes.

The goal of this change is to prevent setStageDiagnostics from losing
diagnostics from other stages. To achieve this, we recover the old diagnostics
for all stages and merge them with the new stage.

* Fix hlint

* Use Map.insert for clarity

* Fix redundant imports

* Fix "code actions after edit" experiment"
2020-12-21 06:06:51 +00:00
..
exe Allow to easily customise the example used for benchmarks (#838) 2020-09-29 07:47:09 +01:00
hist Extract the benchmarking Shake rules to a standalone Cabal package (#941) 2020-12-07 15:03:15 +00:00
lib Fix diagnostics update bug (#959) 2020-12-21 06:06:51 +00:00
config.yaml Prepare for v0.6.0 release (#940) 2020-12-09 08:35:09 +00:00
README.md Allow to easily customise the example used for benchmarks (#838) 2020-09-29 07:47:09 +01:00

README.md

Benchmarks

This folder contains two Haskell programs that work together to simplify the performance analysis of ghcide:

  • exe/Main.hs - a standalone benchmark runner. Run with stack run ghcide-bench
  • hist/Main.hs - a Shake script for running the benchmark suite over a set of commits.
    • Run with stack bench or cabal bench,
    • Requires a ghcide-bench binary in the PATH (usually provided by stack/cabal),
    • Calls cabal (or stack, configurable) internally to build the project,
    • Driven by the config.yaml configuration file. By default it compares HEAD with "master"

Further details available in the config file and the module header comments.