[PATCH] D116425: [clang-tidy] Improve modernize-redundant-void-arg to recognize macro uses

[Richard via Phabricator via cfe-commits]

LegalizeAdulthood created this revision.
LegalizeAdulthood added a reviewer: alexfh.
LegalizeAdulthood added a project: clang-tools-extra.
Herald added subscribers: carlosgalvezp, xazax.hun.
LegalizeAdulthood requested review of this revision.

Sometimes a macro invocation will look like an argument list
declaration.  Improve the check to detect this situation and not
try to modify the macro invocation.

Thanks to Nathan James for the fix.

Fixes #43791


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D116425

Files:
  clang-tools-extra/clang-tidy/modernize/RedundantVoidArgCheck.cpp
  clang-tools-extra/test/clang-tidy/checkers/modernize-redundant-void-arg.cpp


Index: clang-tools-extra/test/clang-tidy/checkers/modernize-redundant-void-arg.cpp
===================================================================
--- clang-tools-extra/test/clang-tidy/checkers/modernize-redundant-void-arg.cpp
+++ clang-tools-extra/test/clang-tidy/checkers/modernize-redundant-void-arg.cpp
@@ -556,3 +556,9 @@
   S_3<int>();
   g_3<int>();
 }
+
+#define return_t(T) T
+return_t(void) func(void);
+// CHECK-MESSAGES: :[[@LINE-1]]:21: warning: redundant void argument list in function declaration
+// CHECK-FIXES: return_t(void) func();
+#undef return_t
Index: clang-tools-extra/clang-tidy/modernize/RedundantVoidArgCheck.cpp
===================================================================
--- clang-tools-extra/clang-tidy/modernize/RedundantVoidArgCheck.cpp
+++ clang-tools-extra/clang-tidy/modernize/RedundantVoidArgCheck.cpp
@@ -97,9 +97,12 @@
 
 void RedundantVoidArgCheck::processFunctionDecl(
     const MatchFinder::MatchResult &Result, const FunctionDecl *Function) {
+  const auto *Method = dyn_cast<CXXMethodDecl>(Function);
+  SourceLocation Start = Method && Method->getParent()->isLambda()
+                             ? Method->getBeginLoc()
+                             : Function->getLocation();
+  SourceLocation End = Function->getEndLoc();
   if (Function->isThisDeclarationADefinition()) {
-    SourceLocation Start = Function->getBeginLoc();
-    SourceLocation End = Function->getEndLoc();
     if (const Stmt *Body = Function->getBody()) {
       End = Body->getBeginLoc();
       if (End.isMacroID() &&
@@ -110,7 +113,7 @@
     removeVoidArgumentTokens(Result, SourceRange(Start, End),
                              "function definition");
   } else {
-    removeVoidArgumentTokens(Result, Function->getSourceRange(),
+    removeVoidArgumentTokens(Result, SourceRange(Start, End),
                              "function declaration");
   }
 }


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