[PATCH] D35787: [clang-tidy] Ignore vector<bool> in inefficient-vector-operation.

[Haojian Wu via Phabricator via cfe-commits]

hokein created this revision.
Herald added subscribers: xazax.hun, JDevlieghere.

https://reviews.llvm.org/D35787

Files:
  clang-tidy/performance/InefficientVectorOperationCheck.cpp
  test/clang-tidy/performance-inefficient-vector-operation.cpp


Index: test/clang-tidy/performance-inefficient-vector-operation.cpp
===================================================================
--- test/clang-tidy/performance-inefficient-vector-operation.cpp
+++ test/clang-tidy/performance-inefficient-vector-operation.cpp
@@ -274,4 +274,12 @@
       z12.push_back(e);
     }
   }
+  {
+    std::vector<bool> z14;
+    // std::vector<bool> will be ignored as STL provides a possibly
+    // space-efficient specilaization of std::vector for the type "bool".
+    for (int i = 0; i < 10; ++i) {
+      z14.push_back(true);
+    }
+  }
 }
Index: clang-tidy/performance/InefficientVectorOperationCheck.cpp
===================================================================
--- clang-tidy/performance/InefficientVectorOperationCheck.cpp
+++ clang-tidy/performance/InefficientVectorOperationCheck.cpp
@@ -73,8 +73,13 @@
 }
 
 void InefficientVectorOperationCheck::registerMatchers(MatchFinder *Finder) {
-  const auto VectorDecl = cxxRecordDecl(hasAnyName(SmallVector<StringRef, 5>(
-      VectorLikeClasses.begin(), VectorLikeClasses.end())));
+  const auto VectorDecl = classTemplateSpecializationDecl(
+      hasAnyName(SmallVector<StringRef, 5>(VectorLikeClasses.begin(),
+                                           VectorLikeClasses.end())),
+      // Exclude std::vector<bool>: STL provides a specilaization of std::vector
+      // for the type "bool", which may be optimized for space efficiency (e.g.
+      // each element occupies a single bit instead of sizeof(bool) bytes).
+      unless(hasTemplateArgument(0, refersToType(booleanType()))));
   const auto VectorDefaultConstructorCall = cxxConstructExpr(
       hasType(VectorDecl),
       hasDeclaration(cxxConstructorDecl(isDefaultConstructor())));


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