[SymbolGraphGen] allow cursor symbol graphs from function params (#67267)

rdar://105516823

Author: QuietMisdreavus

lib/SymbolGraphGen/Symbol.cpp

@@ -91,6 +91,7 @@ std::pair<StringRef, StringRef> Symbol::getKind(const Decl *D) {
       return {"swift.method", "Instance Method"};
     return {"swift.func", "Function"};
   }
+  case swift::DeclKind::Param: LLVM_FALLTHROUGH;
   case swift::DeclKind::Var: {
     const auto *VD = cast<ValueDecl>(D);
 
@@ -839,6 +840,7 @@ bool Symbol::supportsKind(DeclKind Kind) {
   case DeclKind::Destructor: LLVM_FALLTHROUGH;
   case DeclKind::Func: LLVM_FALLTHROUGH;
   case DeclKind::Var: LLVM_FALLTHROUGH;
+  case DeclKind::Param: LLVM_FALLTHROUGH;
   case DeclKind::Subscript: LLVM_FALLTHROUGH;
   case DeclKind::TypeAlias: LLVM_FALLTHROUGH;
   case DeclKind::AssociatedType: LLVM_FALLTHROUGH;

test/SourceKit/CursorInfo/cursor_symbol_graph_param.swift

@@ -0,0 +1,49 @@
+func foo(_ fn: (Int) -> Void) {}
+
+foo { bar in
+}
+
+// RUN: %empty-directory(%t)
+// RUN:  %sourcekitd-test -req=cursor -pos=1:12 -req-opts=retrieve_symbol_graph=1 %s -- %s -target %target-triple | %FileCheck -check-prefix=CHECK_FN %s
+// RUN:  %sourcekitd-test -req=cursor -pos=3:7 -req-opts=retrieve_symbol_graph=1 %s -- %s -target %target-triple | %FileCheck -check-prefix=CHECK_BAR %s
+
+// CHECK_FN: SYMBOL GRAPH BEGIN
+// CHECK_FN: {
+// CHECK_FN:   "symbols": [
+// CHECK_FN:     {
+// CHECK_FN:       "identifier": {
+// CHECK_FN:         "interfaceLanguage": "swift",
+// CHECK_FN:         "precise": "s:25cursor_symbol_graph_param3fooyyySiXEF2fnL_yySiXEvp"
+// CHECK_FN:       },
+// CHECK_FN:       "kind": {
+// CHECK_FN:         "displayName": "Global Variable",
+// CHECK_FN:         "identifier": "swift.var"
+// CHECK_FN:       },
+// CHECK_FN:       "pathComponents": [
+// CHECK_FN:         "foo(_:)",
+// CHECK_FN:         "fn"
+// CHECK_FN:       ]
+// CHECK_FN:     }
+// CHECK_FN:   ]
+// CHECK_FN: }
+// CHECK_FN: SYMBOL GRAPH END
+
+// CHECK_BAR: SYMBOL GRAPH BEGIN
+// CHECK_BAR: {
+// CHECK_BAR:   "symbols": [
+// CHECK_BAR:     {
+// CHECK_BAR:       "identifier": {
+// CHECK_BAR:         "interfaceLanguage": "swift",
+// CHECK_BAR:         "precise": "s:25cursor_symbol_graph_paramySiXEfU_3barL_Sivp"
+// CHECK_BAR:       },
+// CHECK_BAR:       "kind": {
+// CHECK_BAR:         "displayName": "Global Variable",
+// CHECK_BAR:         "identifier": "swift.var"
+// CHECK_BAR:       },
+// CHECK_BAR:       "pathComponents": [
+// CHECK_BAR:         "bar"
+// CHECK_BAR:       ]
+// CHECK_BAR:     }
+// CHECK_BAR:   ]
+// CHECK_BAR: }
+// CHECK_BAR: SYMBOL GRAPH END