clang-tools  4.0.0
SizeofContainerCheck.cpp
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1 //===--- SizeofContainerCheck.cpp - clang-tidy-----------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "SizeofContainerCheck.h"
11 #include "clang/AST/ASTContext.h"
12 #include "clang/ASTMatchers/ASTMatchFinder.h"
13 
14 using namespace clang::ast_matchers;
15 
16 namespace clang {
17 namespace tidy {
18 namespace misc {
19 
20 void SizeofContainerCheck::registerMatchers(MatchFinder *Finder) {
21  Finder->addMatcher(
22  expr(unless(isInTemplateInstantiation()),
23  expr(sizeOfExpr(has(ignoringParenImpCasts(
24  expr(hasType(hasCanonicalType(hasDeclaration(cxxRecordDecl(
25  matchesName("^(::std::|::string)"),
26  unless(matchesName("^::std::(bitset|array)$")),
27  hasMethod(cxxMethodDecl(hasName("size"), isPublic(),
28  isConst())))))))))))
29  .bind("sizeof"),
30  // Ignore ARRAYSIZE(<array of containers>) pattern.
31  unless(hasAncestor(binaryOperator(
32  anyOf(hasOperatorName("/"), hasOperatorName("%")),
33  hasLHS(ignoringParenCasts(sizeOfExpr(expr()))),
34  hasRHS(ignoringParenCasts(equalsBoundNode("sizeof"))))))),
35  this);
36 }
37 
38 void SizeofContainerCheck::check(const MatchFinder::MatchResult &Result) {
39  const auto *SizeOf =
40  Result.Nodes.getNodeAs<UnaryExprOrTypeTraitExpr>("sizeof");
41 
42  auto Diag =
43  diag(SizeOf->getLocStart(), "sizeof() doesn't return the size of the "
44  "container; did you mean .size()?");
45 }
46 
47 } // namespace misc
48 } // namespace tidy
49 } // namespace clang
std::unique_ptr< ast_matchers::MatchFinder > Finder
Definition: ClangTidy.cpp:262
const NamedDecl * Result
Definition: USRFinder.cpp:162