Reland "[clangd] Add feature modules registry" #154836
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This patch adds feature modules registry, which allows to discover registered feature modules and add them into the clangd's feature module set
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@llvm/pr-subscribers-clang-tools-extra @llvm/pr-subscribers-clangd Author: Aleksandr Platonov (ArcsinX) ChangesReland #153756 LLVM_INSTANTIATE_REGISTRY(..) and FeatureModuleRegistry::entries() were in different translation units, that rises a warning when compiling with clang and leads to compilation failure if -Werror flag is set. Full diff: https://github.com/llvm/llvm-project/pull/154836.diff 3 Files Affected:
diff --git a/clang-tools-extra/clangd/FeatureModule.cpp b/clang-tools-extra/clangd/FeatureModule.cpp
index 872cea1443789..38461e3db4e6b 100644
--- a/clang-tools-extra/clangd/FeatureModule.cpp
+++ b/clang-tools-extra/clangd/FeatureModule.cpp
@@ -22,6 +22,10 @@ FeatureModule::Facilities &FeatureModule::facilities() {
return *Fac;
}
+void FeatureModuleSet::add(std::unique_ptr<FeatureModule> M) {
+ Modules.push_back(std::move(M));
+}
+
bool FeatureModuleSet::addImpl(void *Key, std::unique_ptr<FeatureModule> M,
const char *Source) {
if (!Map.try_emplace(Key, M.get()).second) {
@@ -33,5 +37,16 @@ bool FeatureModuleSet::addImpl(void *Key, std::unique_ptr<FeatureModule> M,
return true;
}
+FeatureModuleSet FeatureModuleSet::fromRegistry() {
+ FeatureModuleSet ModuleSet;
+ for (FeatureModuleRegistry::entry E : FeatureModuleRegistry::entries()) {
+ vlog("Adding feature module '{0}' ({1})", E.getName(), E.getDesc());
+ ModuleSet.add(E.instantiate());
+ }
+ return ModuleSet;
+}
+
} // namespace clangd
} // namespace clang
+
+LLVM_INSTANTIATE_REGISTRY(clang::clangd::FeatureModuleRegistry)
diff --git a/clang-tools-extra/clangd/FeatureModule.h b/clang-tools-extra/clangd/FeatureModule.h
index 7b6883507be3f..ee65aa8a59ed2 100644
--- a/clang-tools-extra/clangd/FeatureModule.h
+++ b/clang-tools-extra/clangd/FeatureModule.h
@@ -15,6 +15,7 @@
#include "llvm/ADT/FunctionExtras.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/JSON.h"
+#include "llvm/Support/Registry.h"
#include <memory>
#include <optional>
#include <type_traits>
@@ -143,9 +144,14 @@ class FeatureModule {
/// A FeatureModuleSet is a collection of feature modules installed in clangd.
///
-/// Modules can be looked up by type, or used via the FeatureModule interface.
-/// This allows individual modules to expose a public API.
-/// For this reason, there can be only one feature module of each type.
+/// Modules added with explicit type specification can be looked up by type, or
+/// used via the FeatureModule interface. This allows individual modules to
+/// expose a public API. For this reason, there can be only one feature module
+/// of each type.
+///
+/// Modules added using a base class pointer can be used only via the
+/// FeatureModule interface and can't be looked up by type, thus custom public
+/// API (if provided by the module) can't be used.
///
/// The set owns the modules. It is itself owned by main, not ClangdServer.
class FeatureModuleSet {
@@ -164,6 +170,8 @@ class FeatureModuleSet {
public:
FeatureModuleSet() = default;
+ static FeatureModuleSet fromRegistry();
+
using iterator = llvm::pointee_iterator<decltype(Modules)::iterator>;
using const_iterator =
llvm::pointee_iterator<decltype(Modules)::const_iterator>;
@@ -172,6 +180,7 @@ class FeatureModuleSet {
const_iterator begin() const { return const_iterator(Modules.begin()); }
const_iterator end() const { return const_iterator(Modules.end()); }
+ void add(std::unique_ptr<FeatureModule> M);
template <typename Mod> bool add(std::unique_ptr<Mod> M) {
return addImpl(&ID<Mod>::Key, std::move(M), LLVM_PRETTY_FUNCTION);
}
@@ -185,6 +194,8 @@ class FeatureModuleSet {
template <typename Mod> int FeatureModuleSet::ID<Mod>::Key;
+using FeatureModuleRegistry = llvm::Registry<FeatureModule>;
+
} // namespace clangd
} // namespace clang
#endif
diff --git a/clang-tools-extra/clangd/tool/ClangdMain.cpp b/clang-tools-extra/clangd/tool/ClangdMain.cpp
index f287439f10cab..1856d4f47ffc5 100644
--- a/clang-tools-extra/clangd/tool/ClangdMain.cpp
+++ b/clang-tools-extra/clangd/tool/ClangdMain.cpp
@@ -13,6 +13,7 @@
#include "Config.h"
#include "ConfigProvider.h"
#include "Feature.h"
+#include "FeatureModule.h"
#include "IncludeCleaner.h"
#include "PathMapping.h"
#include "Protocol.h"
@@ -1017,6 +1018,10 @@ clangd accepts flags on the commandline, and in the CLANGD_FLAGS environment var
: static_cast<int>(ErrorResultCode::CheckFailed);
}
+ FeatureModuleSet ModuleSet = FeatureModuleSet::fromRegistry();
+ if (ModuleSet.begin() != ModuleSet.end())
+ Opts.FeatureModules = &ModuleSet;
+
// Initialize and run ClangdLSPServer.
// Change stdin to binary to not lose \r\n on windows.
llvm::sys::ChangeStdinToBinary();
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kadircet
requested changes
Aug 26, 2025
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@kadircet Sorry to bother you. Can you please take a look on this once again? |
kadircet
approved these changes
Sep 17, 2025
clang-tools-extra/clangd/unittests/FeatureModulesRegistryTests.cpp
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/27/builds/16372 Here is the relevant piece of the build log for the reference |
ckoparkar
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Sep 23, 2025
* main: (1562 commits) Document Policy on supporting newer C++ standard in LLVM codebase (llvm#156823) [MLIR][Transform][SMT] Introduce transform.smt.constrain_params (llvm#159450) Reapply "[compiler-rt] Remove %T from shared object substitutions (llvm#155302)" [NFC] [IndVarSimplify] Add non-overflowing usub test (llvm#159683) [Github] Remove separate tools checkout from pr-code workflows (llvm#159967) [clang] fix using enum redecl in template regression (llvm#159996) [DAG] Skip `mstore` combine for `<1 x ty>` vectors (llvm#159915) [mlir] Expose optional `PatternBenefit` to `func` populate functions (NFC) (llvm#159986) [LV] Set correct costs for interleave group members. [clang] ast-dump: use template pattern for `instantiated_from` (llvm#159952) [ARM] ha-alignstack-call.ll - regenerate test checks (llvm#159988) [LLD][MachO] Silence warning when building with MSVC [llvm][Analysis] Silence warning when building with MSVC [LV] Skip select cost for invariant divisors in legacy cost model. [Clang] Fix an error-recovery crash after d1a80de (llvm#159976) [VPlanPatternMatch] Introduce m_ConstantInt (llvm#159558) [GlobalISel] Add G_ABS computeKnownBits (llvm#154413) [gn build] Port 4cabd1e Reland "[clangd] Add feature modules registry" (llvm#154836) [LV] Also handle non-uniform scalarized loads when processing AddrDefs. ...
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Reland #153756
LLVM_INSTANTIATE_REGISTRY(..) and FeatureModuleRegistry::entries() were in different translation units, that rises a warning when compiling with clang and leads to compilation failure if -Werror flag is set.
Instead of iterating directly in the main function, a static method FeatureModuleSet::fromRegistry() was added and it is called in the main function.