1 //===--- SizeofContainerCheck.cpp - clang-tidy-----------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "SizeofContainerCheck.h"
10 #include "clang/AST/ASTContext.h"
11 #include "clang/ASTMatchers/ASTMatchFinder.h"
12
13 using namespace clang::ast_matchers;
14
15 namespace clang::tidy::bugprone {
16
registerMatchers(MatchFinder * Finder)17 void SizeofContainerCheck::registerMatchers(MatchFinder *Finder) {
18 Finder->addMatcher(
19 expr(unless(isInTemplateInstantiation()),
20 expr(sizeOfExpr(has(ignoringParenImpCasts(
21 expr(hasType(hasCanonicalType(hasDeclaration(cxxRecordDecl(
22 matchesName("^(::std::|::string)"),
23 unless(matchesName("^::std::(bitset|array)$")),
24 hasMethod(cxxMethodDecl(hasName("size"), isPublic(),
25 isConst())))))))))))
26 .bind("sizeof"),
27 // Ignore ARRAYSIZE(<array of containers>) pattern.
28 unless(hasAncestor(binaryOperator(
29 hasAnyOperatorName("/", "%"),
30 hasLHS(ignoringParenCasts(sizeOfExpr(expr()))),
31 hasRHS(ignoringParenCasts(equalsBoundNode("sizeof"))))))),
32 this);
33 }
34
check(const MatchFinder::MatchResult & Result)35 void SizeofContainerCheck::check(const MatchFinder::MatchResult &Result) {
36 const auto *SizeOf =
37 Result.Nodes.getNodeAs<UnaryExprOrTypeTraitExpr>("sizeof");
38
39 auto Diag =
40 diag(SizeOf->getBeginLoc(), "sizeof() doesn't return the size of the "
41 "container; did you mean .size()?");
42 }
43
44 } // namespace clang::tidy::bugprone
45