Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/clang-tools-extra/clang-tidy/misc/SizeofContainerCheck.cpp

@@ -0,0 +1,49 @@
+//===--- SizeofContainerCheck.cpp - clang-tidy-----------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "SizeofContainerCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+namespace misc {
+
+void SizeofContainerCheck::registerMatchers(MatchFinder *Finder) {
+  Finder->addMatcher(
+      expr(unless(isInTemplateInstantiation()),
+           expr(sizeOfExpr(has(ignoringParenImpCasts(
+                    expr(hasType(hasCanonicalType(hasDeclaration(cxxRecordDecl(
+                        matchesName("^(::std::|::string)"),
+                        unless(matchesName("^::std::(bitset|array)$")),
+                        hasMethod(cxxMethodDecl(hasName("size"), isPublic(),
+                                                isConst())))))))))))
+               .bind("sizeof"),
+           // Ignore ARRAYSIZE(<array of containers>) pattern.
+           unless(hasAncestor(binaryOperator(
+               anyOf(hasOperatorName("/"), hasOperatorName("%")),
+               hasLHS(ignoringParenCasts(sizeOfExpr(expr()))),
+               hasRHS(ignoringParenCasts(equalsBoundNode("sizeof"))))))),
+      this);
+}
+
+void SizeofContainerCheck::check(const MatchFinder::MatchResult &Result) {
+  const auto *SizeOf =
+      Result.Nodes.getNodeAs<UnaryExprOrTypeTraitExpr>("sizeof");
+
+  auto Diag =
+      diag(SizeOf->getLocStart(), "sizeof() doesn't return the size of the "
+                                  "container; did you mean .size()?");
+}
+
+} // namespace misc
+} // namespace tidy
+} // namespace clang