[PATCH] D103678: [Format] Fix incorrect pointer/reference detection

[Yilong Guo via Phabricator via cfe-commits]

Nuullll created this revision.
Nuullll added reviewers: djasper, HazardyKnusperkeks, curdeius, MyDeveloperDay.
Nuullll added a project: clang-format.
Nuullll requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

https://llvm.org/PR50568

When an overloaded operator is called, its argument must be an
expression.

Before:

  void f() { a.operator()(a *a); }

After:

  void f() { a.operator()(a * a); }

Signed-off-by: Yilong Guo <yilong.guo at intel.com>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D103678

Files:
  clang/lib/Format/TokenAnnotator.cpp
  clang/unittests/Format/FormatTest.cpp


Index: clang/unittests/Format/FormatTest.cpp
===================================================================
--- clang/unittests/Format/FormatTest.cpp
+++ clang/unittests/Format/FormatTest.cpp
@@ -8761,6 +8761,11 @@
                "operator()() && {}");
   verifyGoogleFormat("template <typename T>\n"
                      "auto x() & -> int {}");
+
+  // Should be binary operators when used as an argument expression (overloaded
+  // operator invoked as a member function)
+  verifyFormat("void f() { a.operator()(a * a); }");
+  verifyFormat("void f() { a->operator()(a & a); }");
 }
 
 TEST_F(FormatTest, UnderstandsAttributes) {
Index: clang/lib/Format/TokenAnnotator.cpp
===================================================================
--- clang/lib/Format/TokenAnnotator.cpp
+++ clang/lib/Format/TokenAnnotator.cpp
@@ -229,7 +229,19 @@
     }
 
     if (Left->is(TT_OverloadedOperatorLParen)) {
-      Contexts.back().IsExpression = false;
+      // Find the previous kw_operator token
+      FormatToken *Prev = Left;
+      while (!Prev->is(tok::kw_operator)) {
+        Prev = Prev->Previous;
+        assert(Prev);
+      }
+
+      // If faced with "a.operator*(argument)" or "a->operator*(argument)"
+      // i.e. the operator is called as a member function
+      // then the argument must be an expression
+      bool OperatorCalledAsMemberFunction =
+          Prev->Previous && Prev->Previous->isOneOf(tok::period, tok::arrow);
+      Contexts.back().IsExpression = OperatorCalledAsMemberFunction;
     } else if (Style.Language == FormatStyle::LK_JavaScript &&
                (Line.startsWith(Keywords.kw_type, tok::identifier) ||
                 Line.startsWith(tok::kw_export, Keywords.kw_type,


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