[PATCH] D72634: [clangd] Improve ObjC property handling in SelectionTree.

[Sam McCall via Phabricator via cfe-commits]

sammccall created this revision.
sammccall added a reviewer: dgoldman.
Herald added subscribers: cfe-commits, usaxena95, kadircet, jfb, arphaman, jkorous, MaskRay, ilya-biryukov.
Herald added a project: clang.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D72634

Files:
  clang-tools-extra/clangd/Selection.cpp
  clang-tools-extra/clangd/unittests/FindTargetTests.cpp
  clang-tools-extra/clangd/unittests/SelectionTests.cpp


Index: clang-tools-extra/clangd/unittests/SelectionTests.cpp
===================================================================
--- clang-tools-extra/clangd/unittests/SelectionTests.cpp
+++ clang-tools-extra/clangd/unittests/SelectionTests.cpp
@@ -323,6 +323,29 @@
             Foo x = [[^12_ud]];
           )cpp",
           "UserDefinedLiteral"},
+
+      // Objective-C OpaqueValueExpr/PseudoObjectExpr has weird ASTs.
+      // Need to traverse the contents of the OpaqueValueExpr to the POE,
+      // and ensure we traverse only the syntactic form of the PseudoObjectExpr.
+      {
+          R"cpp(
+            @interface I{}
+            @property(retain) I*x;
+            @property(retain) I*y;
+            @end
+            void test(I *f) { [[^f]].x.y = 0; }
+          )cpp",
+          "DeclRefExpr"},
+      {
+          R"cpp(
+            @interface I{}
+            @property(retain) I*x;
+            @property(retain) I*y;
+            @end
+            void test(I *f) { [[f.^x]].y = 0; }
+          )cpp",
+          "ObjCPropertyRefExpr"},
+
   };
   for (const Case &C : Cases) {
     Annotations Test(C.Code);
@@ -333,6 +356,7 @@
     // FIXME: Auto-completion in a template requires disabling delayed template
     // parsing.
     TU.ExtraArgs.push_back("-fno-delayed-template-parsing");
+    TU.ExtraArgs.push_back("-xobjective-c++");
 
     auto AST = TU.build();
     auto T = makeSelectionTree(C.Code, AST);
Index: clang-tools-extra/clangd/unittests/FindTargetTests.cpp
===================================================================
--- clang-tools-extra/clangd/unittests/FindTargetTests.cpp
+++ clang-tools-extra/clangd/unittests/FindTargetTests.cpp
@@ -511,7 +511,8 @@
       [[f.x]].y = 0;
     }
   )cpp";
-  EXPECT_DECLS("OpaqueValueExpr", "@property(atomic, retain, readwrite) I *x");
+  EXPECT_DECLS("ObjCPropertyRefExpr",
+               "@property(atomic, retain, readwrite) I *x");
 
   Code = R"cpp(
     @protocol Foo
Index: clang-tools-extra/clangd/Selection.cpp
===================================================================
--- clang-tools-extra/clangd/Selection.cpp
+++ clang-tools-extra/clangd/Selection.cpp
@@ -462,6 +462,14 @@
              TraverseStmt(S->getRangeInit()) && TraverseStmt(S->getBody());
     });
   }
+  // OpaqueValueExpr blocks traversal, we must explicitly traverse it.
+  bool TraverseOpaqueValueExpr(OpaqueValueExpr *E) {
+    return traverseNode(E, [&] { return TraverseStmt(E->getSourceExpr()); });
+  }
+  // We only want to traverse the *syntactic form* to understand the selection.
+  bool TraversePseudoObjectExpr(PseudoObjectExpr *E) {
+    return traverseNode(E, [&] { return TraverseStmt(E->getSyntacticForm()); });
+  }
 
 private:
   using Base = RecursiveASTVisitor<SelectionVisitor>;


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