clang-tools  3.8.0
ProBoundsPointerArithmeticCheck.cpp
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1 //===--- ProBoundsPointerArithmeticCheck.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 
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 
19 void ProBoundsPointerArithmeticCheck::registerMatchers(MatchFinder *Finder) {
20  if (!getLangOpts().CPlusPlus)
21  return;
22 
23  // Flag all operators +, -, +=, -=, ++, -- that result in a pointer
24  Finder->addMatcher(
25  binaryOperator(
26  anyOf(hasOperatorName("+"), hasOperatorName("-"),
27  hasOperatorName("+="), hasOperatorName("-=")),
28  hasType(pointerType()),
29  unless(hasLHS(ignoringImpCasts(declRefExpr(to(isImplicit()))))))
30  .bind("expr"),
31  this);
32 
33  Finder->addMatcher(
34  unaryOperator(anyOf(hasOperatorName("++"), hasOperatorName("--")),
35  hasType(pointerType()))
36  .bind("expr"),
37  this);
38 
39  // Array subscript on a pointer (not an array) is also pointer arithmetic
40  Finder->addMatcher(
41  arraySubscriptExpr(
42  hasBase(ignoringImpCasts(
43  anyOf(hasType(pointerType()),
44  hasType(decayedType(hasDecayedType(pointerType())))))))
45  .bind("expr"),
46  this);
47 }
48 
49 void
50 ProBoundsPointerArithmeticCheck::check(const MatchFinder::MatchResult &Result) {
51  const auto *MatchedExpr = Result.Nodes.getNodeAs<Expr>("expr");
52 
53  diag(MatchedExpr->getExprLoc(), "do not use pointer arithmetic");
54 }
55 
56 } // namespace tidy
57 } // namespace clang
std::unique_ptr< ast_matchers::MatchFinder > Finder
Definition: ClangTidy.cpp:188
const NamedDecl * Result
Definition: USRFinder.cpp:121