[PATCH] D27187: [clang-tidy] Do not move parameter if only DeclRefExpr occurs inside of a loop

[Felix Berger via Phabricator via cfe-commits]

flx updated this revision to Diff 81693.

https://reviews.llvm.org/D27187

Files:
  clang-tidy/performance/UnnecessaryValueParamCheck.cpp
  test/clang-tidy/performance-unnecessary-value-param.cpp


Index: test/clang-tidy/performance-unnecessary-value-param.cpp
===================================================================
--- test/clang-tidy/performance-unnecessary-value-param.cpp
+++ test/clang-tidy/performance-unnecessary-value-param.cpp
@@ -225,6 +225,15 @@
   // CHECK-FIXES: F = std::move(E);
 }
 
+// The argument could be moved but is not since copy statement is inside a loop.
+void PositiveNoMoveInsideLoop(ExpensiveMovableType E) {
+  // CHECK-MESSAGES: [[@LINE-1]]:52: warning: the parameter 'E' is copied
+  // CHECK-FIXES: void PositiveNoMoveInsideLoop(const ExpensiveMovableType& E) {
+  for (;;) {
+    auto F = E;
+  }
+}
+
 void PositiveConstRefNotMoveConstructible(ExpensiveToCopyType T) {
   // CHECK-MESSAGES: [[@LINE-1]]:63: warning: the parameter 'T' is copied
   // CHECK-FIXES: void PositiveConstRefNotMoveConstructible(const ExpensiveToCopyType& T) {
Index: clang-tidy/performance/UnnecessaryValueParamCheck.cpp
===================================================================
--- clang-tidy/performance/UnnecessaryValueParamCheck.cpp
+++ clang-tidy/performance/UnnecessaryValueParamCheck.cpp
@@ -47,6 +47,17 @@
   return !Matches.empty();
 }
 
+bool hasLoopStmtAncestor(const DeclRefExpr &DeclRef, const Stmt &Stmt,
+                         ASTContext &Context) {
+  auto Matches =
+      match(findAll(declRefExpr(
+                equalsNode(&DeclRef),
+                unless(hasAncestor(stmt(anyOf(forStmt(), cxxForRangeStmt(),
+                                              whileStmt(), doStmt())))))),
+            Stmt, Context);
+  return Matches.empty();
+}
+
 } // namespace
 
 UnnecessaryValueParamCheck::UnnecessaryValueParamCheck(
@@ -105,6 +116,8 @@
   if (!IsConstQualified) {
     auto CanonicalType = Param->getType().getCanonicalType();
     if (AllDeclRefExprs.size() == 1 &&
+        !hasLoopStmtAncestor(**AllDeclRefExprs.begin(), *Function->getBody(),
+                             *Result.Context) &&
         ((utils::type_traits::hasNonTrivialMoveConstructor(CanonicalType) &&
           utils::decl_ref_expr::isCopyConstructorArgument(
               **AllDeclRefExprs.begin(), *Function->getBody(),


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