Reworked switch to be generated using TableGen

Author: to268

clang/include/clang/Basic/Attr.td

@@ -737,6 +737,9 @@ class Attr {
   // our existing general parsing we need to have a separate flag that
   // opts an attribute into strict parsing of attribute parameters
   bit StrictEnumParameters = 0;
+  // Set to true for attributes which have Sema checks which requires the type
+  // to be deduced.
+  bit IsTypeDependent = 0;
   // Lists language options, one of which is required to be true for the
   // attribute to be applicable. If empty, no language options are required.
   list<LangOpt> LangOpts = [];
@@ -1408,6 +1411,7 @@ def Cleanup : InheritableAttr {
   let Args = [DeclArgument<Function, "FunctionDecl">];
   let Subjects = SubjectList<[LocalVar]>;
   let Documentation = [CleanupDocs];
+  bit IsTypeDependent = 1;
   // FIXME: DeclArgument should be reworked to also store the
   // Expr instead of adding attr specific hacks like the following.
   // See the discussion in https://github.com/llvm/llvm-project/pull/14023.

clang/include/clang/Sema/CMakeLists.txt

@@ -8,6 +8,11 @@ clang_tablegen(AttrParsedAttrKinds.inc -gen-clang-attr-parsed-attr-kinds
   SOURCE ../Basic/Attr.td
   TARGET ClangAttrParsedAttrKinds)
 
+clang_tablegen(AttrIsTypeDependent.inc -gen-clang-attr-is-type-dependent
+  -I ${CMAKE_CURRENT_SOURCE_DIR}/../../
+  SOURCE ../Basic/Attr.td
+  TARGET ClangAttrIsTypeDependent)
+
 clang_tablegen(AttrSpellingListIndex.inc -gen-clang-attr-spelling-index
   -I ${CMAKE_CURRENT_SOURCE_DIR}/../../
   SOURCE ../Basic/Attr.td

clang/include/clang/Sema/Sema.h

@@ -4769,6 +4769,8 @@ class Sema final : public SemaBase {
   // linkage or not.
   static bool mightHaveNonExternalLinkage(const DeclaratorDecl *FD);
 
+#include "clang/Sema/AttrIsTypeDependent.inc"
+
   ///@}
 
   //

clang/lib/Sema/SemaDecl.cpp

@@ -3359,13 +3359,7 @@ void Sema::CheckAttributesOnDeducedType(Expr *E, Decl *D) {
     return;
 
   for (const Attr *A : D->getAttrs()) {
-    switch (A->getKind()) {
-    case attr::Cleanup:
-      ActOnCleanupAttr(E, D, A);
-      break;
-    default:
-      continue;
-    }
+    checkAttrIsTypeDependent(E, D, A);
   }
 }
 

clang/utils/TableGen/ClangAttrEmitter.cpp

@@ -5061,6 +5061,32 @@ void EmitClangAttrParsedAttrKinds(const RecordKeeper &Records,
      << "}\n";
 }
 
+// Emits Sema calls for type dependent attributes
+void EmitClangAttrIsTypeDependent(const RecordKeeper &Records,
+                                  raw_ostream &OS) {
+  emitSourceFileHeader("Attribute is type dependent", OS, Records);
+
+  std::set<StringRef> Seen;
+  for (const auto *A : Records.getAllDerivedDefinitions("Attr")) {
+    const Record &Attr = *A;
+    if (Attr.getValueAsBit("IsTypeDependent")) {
+      Seen.insert(Attr.getName());
+    }
+  }
+
+  OS << "void checkAttrIsTypeDependent(Expr *E, Decl *D, const Attr *A) {\n";
+  OS << "  switch (A->getKind()) {\n";
+  for (const StringRef &SeenAttr : Seen) {
+    OS << "  case attr::" << SeenAttr << ":\n";
+    OS << "    ActOn" << SeenAttr << "Attr(E, D, A);\n";
+    OS << "    break;\n";
+  }
+  OS << "  default:\n";
+  OS << "    break;\n";
+  OS << "  }\n";
+  OS << "}\n";
+}
+
 // Emits the code to dump an attribute.
 void EmitClangAttrTextNodeDump(const RecordKeeper &Records, raw_ostream &OS) {
   emitSourceFileHeader("Attribute text node dumper", OS, Records);

clang/utils/TableGen/TableGen.cpp

@@ -43,6 +43,7 @@ enum ActionType {
   GenClangAttrParsedAttrList,
   GenClangAttrParsedAttrImpl,
   GenClangAttrParsedAttrKinds,
+  GenClangAttrIsTypeDependent,
   GenClangAttrTextNodeDump,
   GenClangAttrNodeTraverse,
   GenClangBasicReader,
@@ -179,6 +180,9 @@ cl::opt<ActionType> Action(
         clEnumValN(GenClangAttrParsedAttrKinds,
                    "gen-clang-attr-parsed-attr-kinds",
                    "Generate a clang parsed attribute kinds"),
+        clEnumValN(GenClangAttrIsTypeDependent,
+                   "gen-clang-attr-is-type-dependent",
+                   "Generate clang is type dependent attribute code"),
         clEnumValN(GenClangAttrTextNodeDump, "gen-clang-attr-text-node-dump",
                    "Generate clang attribute text node dumper"),
         clEnumValN(GenClangAttrNodeTraverse, "gen-clang-attr-node-traverse",
@@ -423,6 +427,9 @@ bool ClangTableGenMain(raw_ostream &OS, const RecordKeeper &Records) {
   case GenClangAttrParsedAttrKinds:
     EmitClangAttrParsedAttrKinds(Records, OS);
     break;
+  case GenClangAttrIsTypeDependent:
+    EmitClangAttrIsTypeDependent(Records, OS);
+    break;
   case GenClangAttrTextNodeDump:
     EmitClangAttrTextNodeDump(Records, OS);
     break;

clang/utils/TableGen/TableGenBackends.h

@@ -82,6 +82,8 @@ void EmitClangAttrParsedAttrImpl(const llvm::RecordKeeper &Records,
                                  llvm::raw_ostream &OS);
 void EmitClangAttrParsedAttrKinds(const llvm::RecordKeeper &Records,
                                   llvm::raw_ostream &OS);
+void EmitClangAttrIsTypeDependent(const llvm::RecordKeeper &Records,
+                                  llvm::raw_ostream &OS);
 void EmitClangAttrTextNodeDump(const llvm::RecordKeeper &Records,
                                llvm::raw_ostream &OS);
 void EmitClangAttrNodeTraverse(const llvm::RecordKeeper &Records,

llvm/docs/TableGen/BackEnds.rst

@@ -355,6 +355,13 @@ ClangAttrParsedAttrKinds
 ``AttributeList::getKind`` function, mapping a string (and syntax) to a parsed
 attribute ``AttributeList::Kind`` enumeration.
 
+ClangAttrIsTypeDependent
+------------------------
+
+**Purpose**: Creates ``AttrIsTypeDependent.inc``, which is used to implement the
+``Sema::CheckAttributesOnDeducedType`` function, mapping an attribute kind to a
+Sema function if it exists.
+
 ClangAttrDump
 -------------