We were making the initial `generateBuildGraph` call in `SourceKitLSPServer` from a `Task`. This means that `generateBuildGraph` could be executed after `waitForUpToDateBuildGraph` was called by `SemanticIndexManager`. Thus `waitForUpToDateBuildGraph` returned immediately and no files were background indexed.
Make `generateBuildGraph` immediately schedule a package reload for SwiftPM build systems instead of doing the hop through a `Task`, fixing the race condition.
rdar://135551812
We currently load the entire package before generating a `SwiftPMBuildSystem`. That means that the initialize request to SourceKit-LSP is blocked until the package has been loaded, preventing us from offering any sort of functionality, including syntactic functionality like formatting.
Decouple build system creation and build graph generation (aka. package loading for SwiftPM). We can operate with fallback build settings until the build graph has been loaded and reopen the document once the proper build settings are available.
rdar://126644596
We forgot to decode the following keys in the custom decode function, which meant that you couldn’t set them using SourceKit-LSP’s `config.json` file.
- `backgroundPreparationMode`
- `sourcekitdRequestTimeout`
- `cancelTextDocumentRequestsOnEditAndClose`
We had the custom decoder function so that the keys weren’t required in the JSON but we could access eg. `SwiftPMOptions` without needing to deal with optionals in the codebase.
Make the accesses to these nested options structs a little more verbose but eliminate the source of the above bug, which seems like a good tradeoff.
Using `SwiftSDK.deriveTargetSwiftSDK`, which is the same method that SwiftPM's own CLI tools use to determine the SDK from passed-in info (target `--triple`, `--swift-sdk`, and host sdk). This allows us to better uphold the contract in the [Configuration File](d11c101ce2/Documentation/Configuration%20File.md (structure)) docs, namely that the `swiftSDK` param is "Equivalent to SwiftPM's `--swift-sdk` option" and similarly for `triple`.
As concrete examples of where (AFAICT) the current implementation diverges:
- Passing a `--triple` of `wasm32-unknown-wasi` to `swift-build` will use the toolchain-integrated Wasm SDK if one exists. Passing the same value to sourcekit-lsp does not do this.
- Perhaps more relevant: after landing https://github.com/swiftlang/swift-package-manager/pull/6828, this change will make it so that building for iOS is as simple as setting `"triple": "arm64-apple-ios"` in the config! Currently, it's necessary to set C/Swift flags and hardcode the sysroot. Should close https://github.com/swiftlang/sourcekit-lsp/issues/1587.
This PR depends on:
- https://github.com/swiftlang/swift-package-manager/pull/7925
Do one of the following for every `FIXME` or `TODO` comment
- Add an issue that tracks the task
- Remove the comment if we are not planning to address it
The SwiftPM build system integration was the only one in its own modules. Merge it into the `BuildSystemIntegration` modules next to eg. the compilation database build system.
