eduucaldas created this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.
eduucaldas requested review of this revision.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D85146

Files:
  clang/lib/Tooling/Syntax/BuildTree.cpp
  clang/unittests/Tooling/Syntax/TreeTest.cpp

Index: clang/unittests/Tooling/Syntax/TreeTest.cpp
===================================================================
--- clang/unittests/Tooling/Syntax/TreeTest.cpp
+++ clang/unittests/Tooling/Syntax/TreeTest.cpp
@@ -4067,6 +4067,78 @@
 )txt"));
 }
 
+TEST_P(SyntaxTreeTest, MemberFunctionPointer) {
+  if (!GetParam().isCXX()) {
+    return;
+  }
+  EXPECT_TRUE(treeDumpEqual(
+      R"cpp(
+struct X{
+  struct Y{};
+};
+void (X::*xp)();
+// FIXME: Generate the right syntax tree for this type,
+// i.e. create a syntax node for the outer member pointer
+void (X::Y::**xyp)(const int*, char);
+)cpp",
+      R"txt(
+*: TranslationUnit
+|-SimpleDeclaration
+| |-struct
+| |-X
+| |-{
+| |-SimpleDeclaration
+| | |-struct
+| | |-Y
+| | |-{
+| | |-}
+| | `-;
+| |-}
+| `-;
+|-SimpleDeclaration
+| |-void
+| |-SimpleDeclarator
+| | |-ParenDeclarator
+| | | |-(
+| | | |-MemberPointer
+| | | | |-X
+| | | | |-::
+| | | | `-*
+| | | |-xp
+| | | `-)
+| | `-ParametersAndQualifiers
+| |   |-(
+| |   `-)
+| `-;
+`-SimpleDeclaration
+  |-void
+  |-SimpleDeclarator
+  | |-ParenDeclarator
+  | | |-(
+  | | |-X
+  | | |-::
+  | | |-MemberPointer
+  | | | |-Y
+  | | | |-::
+  | | | `-*
+  | | |-*
+  | | |-xyp
+  | | `-)
+  | `-ParametersAndQualifiers
+  |   |-(
+  |   |-SimpleDeclaration
+  |   | |-const
+  |   | |-int
+  |   | `-SimpleDeclarator
+  |   |   `-*
+  |   |-,
+  |   |-SimpleDeclaration
+  |   | `-char
+  |   `-)
+  `-;
+)txt"));
+}
+
 TEST_P(SyntaxTreeTest, ComplexDeclarator) {
   EXPECT_TRUE(treeDumpEqual(
       R"cpp(
Index: clang/lib/Tooling/Syntax/BuildTree.cpp
===================================================================
--- clang/lib/Tooling/Syntax/BuildTree.cpp
+++ clang/lib/Tooling/Syntax/BuildTree.cpp
@@ -987,6 +987,16 @@
     return WalkUpFromFunctionTypeLoc(L);
   }
 
+  bool TraverseMemberPointerTypeLoc(MemberPointerTypeLoc L) {
+    // In the source code "void (Y::*mp)()" `MemberPointerTypeLoc` corresponds
+    // to "Y::*" but it points to a `ParenTypeLoc` that corresponds to
+    // "(Y::*mp)" We thus reverse the order of traversal to get the proper
+    // syntax structure.
+    if (!WalkUpFromMemberPointerTypeLoc(L))
+      return false;
+    return TraverseTypeLoc(L.getPointeeLoc());
+  }
+
   bool WalkUpFromMemberPointerTypeLoc(MemberPointerTypeLoc L) {
     auto SR = L.getLocalSourceRange();
     Builder.foldNode(Builder.getRange(SR),
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