[clangd] Share getSymbolID implementation.

Summary: And remove all duplicated implementation.

Reviewers: ioeric

Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, cfe-commits

Differential Revision: https://reviews.llvm.org/D50375

llvm-svn: 339116

1 files changed, 8 insertions, 0 deletions

diff --git a/clang-tools-extra/clangd/AST.cpp b/clang-tools-extra/clangd/AST.cpp
index ec1862cd73d..1344931a998 100644
--- a/clang-tools-extra/clangd/AST.cpp
+++ b/clang-tools-extra/clangd/AST.cpp
@@ -12,6 +12,7 @@
 #include "clang/AST/ASTContext.h"
 #include "clang/AST/Decl.h"
 #include "clang/Basic/SourceManager.h"
+#include "clang/Index/USRGeneration.h"
 
 namespace clang {
 namespace clangd {
@@ -53,5 +54,12 @@ std::string printQualifiedName(const NamedDecl &ND) {
   return QName;
 }
 
+llvm::Optional<SymbolID> getSymbolID(const Decl *D) {
+  llvm::SmallString<128> USR;
+  if (index::generateUSRForDecl(D, USR))
+    return None;
+  return SymbolID(USR);
+}
+
 } // namespace clangd
 } // namespace clang