[PATCH] D157952: [clang] Support function pointer types with attributes when extracting parameter names for signature help

[Nathan Ridge via Phabricator via cfe-commits]

nridge created this revision.
nridge added reviewers: hokein, kadircet, Qwinci.
Herald added a subscriber: arphaman.
Herald added a project: All.
nridge requested review of this revision.
Herald added subscribers: cfe-commits, wangpc, ilya-biryukov.
Herald added projects: clang, clang-tools-extra.

Fixes https://github.com/clangd/clangd/issues/1729


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D157952

Files:
  clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
  clang/lib/Sema/SemaCodeComplete.cpp


Index: clang/lib/Sema/SemaCodeComplete.cpp
===================================================================
--- clang/lib/Sema/SemaCodeComplete.cpp
+++ clang/lib/Sema/SemaCodeComplete.cpp
@@ -6070,6 +6070,10 @@
     Target = P.getPointeeLoc();
   }
 
+  if (auto A = Target.getAs<AttributedTypeLoc>()) {
+    Target = A.getModifiedLoc();
+  }
+
   if (auto P = Target.getAs<ParenTypeLoc>()) {
     Target = P.getInnerLoc();
   }
Index: clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
===================================================================
--- clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
+++ clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp
@@ -1397,20 +1397,37 @@
 }
 
 TEST(SignatureHelpTest, FunctionPointers) {
-  auto FunctionPointerResults = signatures(R"cpp(
+  llvm::StringLiteral Tests[] = {
+      // Variable of function pointer type
+      R"cpp(
     void (*foo)(int x, int y);
     int main() { foo(^); }
-  )cpp");
-  EXPECT_THAT(FunctionPointerResults.signatures,
-              UnorderedElementsAre(sig("([[int x]], [[int y]]) -> void")));
-
-  auto FunctionPointerTypedefResults = signatures(R"cpp(
+  )cpp",
+      // Wrapped in an AttributedType
+      R"cpp(
+    void (__stdcall *foo)(int x, int y);
+    int main() { foo(^); }
+  )cpp",
+      // Another syntax for an AttributedType
+      R"cpp(
+    void (__attribute__(stdcall) *foo)(int x, int y);
+    int main() { foo(^); },
+  )cpp",
+      // Wrapped in a typedef
+      R"cpp(
     typedef void (*fn)(int x, int y);
     fn foo;
     int main() { foo(^); }
-  )cpp");
-  EXPECT_THAT(FunctionPointerTypedefResults.signatures,
-              UnorderedElementsAre(sig("([[int x]], [[int y]]) -> void")));
+  )cpp",
+      // Wrapped in both a typedef and an AttributedTyped
+      R"cpp(
+    typedef void (__stdcall *fn)(int x, int y);
+    fn foo;
+    int main() { foo(^); }
+  )cpp"};
+  for (auto Test : Tests)
+    EXPECT_THAT(signatures(Test).signatures,
+                UnorderedElementsAre(sig("([[int x]], [[int y]]) -> void")));
 }
 
 TEST(SignatureHelpTest, Constructors) {


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