[PATCH] D54553: [clangd] Fix crash hovering on non-decltype trailing return

[Marc-Andre Laperle via Phabricator via cfe-commits]

malaperle created this revision.
Herald added subscribers: cfe-commits, kadircet, arphaman, jkorous, MaskRay, ioeric, ilya-biryukov.

More specifically, hovering on "auto" in
auto main() -> int {

  return 0;

}

Signed-off-by: Marc-Andre Laperle <malaperle at gmail.com>


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D54553

Files:
  clangd/XRefs.cpp
  unittests/clangd/XRefsTests.cpp


Index: unittests/clangd/XRefsTests.cpp
===================================================================
--- unittests/clangd/XRefsTests.cpp
+++ unittests/clangd/XRefsTests.cpp
@@ -1006,6 +1006,14 @@
           )cpp",
           "int",
       },
+      {
+          R"cpp(// More compilcated structured types.
+            ^auto main() -> int {
+              return 0;
+            }
+          )cpp",
+          "int",
+      },
   };
 
   for (const OneTest &Test : Tests) {
Index: clangd/XRefs.cpp
===================================================================
--- clangd/XRefs.cpp
+++ clangd/XRefs.cpp
@@ -605,6 +605,7 @@
   // Handle auto return types:
   //- auto foo() {}
   //- auto& foo() {}
+  //- auto foo() -> int {}
   //- auto foo() -> decltype(1+1) {}
   //- operator auto() const { return 10; }
   bool VisitFunctionDecl(FunctionDecl *D) {
@@ -624,12 +625,13 @@
     const AutoType *AT = D->getReturnType()->getContainedAutoType();
     if (AT && !AT->getDeducedType().isNull()) {
       DeducedType = AT->getDeducedType();
-    } else {
+    } else if (const DecltypeType *DT = dyn_cast<DecltypeType>(D->getReturnType())) {
       // auto in a trailing return type just points to a DecltypeType and
       // getContainedAutoType does not unwrap it.
-      const DecltypeType *DT = dyn_cast<DecltypeType>(D->getReturnType());
       if (!DT->getUnderlyingType().isNull())
         DeducedType = DT->getUnderlyingType();
+    } else if (!D->getReturnType().isNull()) {
+      DeducedType = D->getReturnType();
     }
     return true;
   }


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