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#include "TUScheduler.h"
#include "clang/Frontend/PCHContainerOperations.h"
#include "llvm/Support/Errc.h"
namespace clang {
namespace clangd {
unsigned getDefaultAsyncThreadsCount() {
unsigned HardwareConcurrency = std::thread::hardware_concurrency();
// C++ standard says that hardware_concurrency()
// may return 0, fallback to 1 worker thread in
// that case.
if (HardwareConcurrency == 0)
return 1;
return HardwareConcurrency;
}
TUScheduler::TUScheduler(unsigned AsyncThreadsCount,
bool StorePreamblesInMemory,
ASTParsedCallback ASTCallback)
: Files(StorePreamblesInMemory, std::make_shared<PCHContainerOperations>(),
std::move(ASTCallback)),
Threads(AsyncThreadsCount) {}
void TUScheduler::update(
Context Ctx, PathRef File, ParseInputs Inputs,
UniqueFunction<void(Context Ctx,
llvm::Optional<std::vector<DiagWithFixIts>>)>
OnUpdated) {
CachedInputs[File] = Inputs;
auto Resources = Files.getOrCreateFile(File);
auto DeferredRebuild = Resources->deferRebuild(std::move(Inputs));
Threads.addToFront(
[](Context Ctx, decltype(OnUpdated) OnUpdated,
decltype(DeferredRebuild) DeferredRebuild) {
auto Diags = DeferredRebuild(Ctx);
OnUpdated(std::move(Ctx), Diags);
},
std::move(Ctx), std::move(OnUpdated), std::move(DeferredRebuild));
}
void TUScheduler::remove(PathRef File,
UniqueFunction<void(llvm::Error)> Action) {
CachedInputs.erase(File);
auto Resources = Files.removeIfPresent(File);
if (!Resources) {
Action(llvm::make_error<llvm::StringError>(
"trying to remove non-added document", llvm::errc::invalid_argument));
return;
}
auto DeferredCancel = Resources->deferCancelRebuild();
Threads.addToFront(
[](decltype(Action) Action, decltype(DeferredCancel) DeferredCancel) {
DeferredCancel();
Action(llvm::Error::success());
},
std::move(Action), std::move(DeferredCancel));
}
void TUScheduler::runWithAST(
PathRef File, UniqueFunction<void(llvm::Expected<InputsAndAST>)> Action) {
auto Resources = Files.getFile(File);
if (!Resources) {
Action(llvm::make_error<llvm::StringError>(
"trying to get AST for non-added document",
llvm::errc::invalid_argument));
return;
}
const ParseInputs &Inputs = getInputs(File);
// We currently block the calling thread until AST is available and run the
// action on the calling thread to avoid inconsistent states coming from
// subsequent updates.
// FIXME(ibiryukov): this should be moved to the worker threads.
Resources->getAST().get()->runUnderLock([&](ParsedAST *AST) {
if (AST)
Action(InputsAndAST{Inputs, *AST});
else
Action(llvm::make_error<llvm::StringError>(
"Could not build AST for the latest file update",
llvm::errc::invalid_argument));
});
}
void TUScheduler::runWithPreamble(
PathRef File,
UniqueFunction<void(llvm::Expected<InputsAndPreamble>)> Action) {
std::shared_ptr<CppFile> Resources = Files.getFile(File);
if (!Resources) {
Action(llvm::make_error<llvm::StringError>(
"trying to get preamble for non-added document",
llvm::errc::invalid_argument));
return;
}
const ParseInputs &Inputs = getInputs(File);
std::shared_ptr<const PreambleData> Preamble =
Resources->getPossiblyStalePreamble();
Threads.addToFront(
[Resources, Preamble, Inputs](decltype(Action) Action) mutable {
if (!Preamble)
Preamble = Resources->getPossiblyStalePreamble();
Action(InputsAndPreamble{Inputs, Preamble.get()});
},
std::move(Action));
}
const ParseInputs &TUScheduler::getInputs(PathRef File) {
auto It = CachedInputs.find(File);
assert(It != CachedInputs.end());
return It->second;
}
std::vector<std::pair<Path, std::size_t>>
TUScheduler::getUsedBytesPerFile() const {
return Files.getUsedBytesPerFile();
}
} // namespace clangd
} // namespace clang
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