clang-tools  7.0.0
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 namespace cppcoreguidelines {
19 
20 void ProBoundsPointerArithmeticCheck::registerMatchers(MatchFinder *Finder) {
21  if (!getLangOpts().CPlusPlus)
22  return;
23 
24  const auto AllPointerTypes = anyOf(
25  hasType(pointerType()), hasType(autoType(hasDeducedType(pointerType()))),
26  hasType(decltypeType(hasUnderlyingType(pointerType()))));
27 
28  // Flag all operators +, -, +=, -=, ++, -- that result in a pointer
29  Finder->addMatcher(
30  binaryOperator(
31  anyOf(hasOperatorName("+"), hasOperatorName("-"),
32  hasOperatorName("+="), hasOperatorName("-=")),
33  AllPointerTypes,
34  unless(hasLHS(ignoringImpCasts(declRefExpr(to(isImplicit()))))))
35  .bind("expr"),
36  this);
37 
38  Finder->addMatcher(
39  unaryOperator(anyOf(hasOperatorName("++"), hasOperatorName("--")),
40  hasType(pointerType()))
41  .bind("expr"),
42  this);
43 
44  // Array subscript on a pointer (not an array) is also pointer arithmetic
45  Finder->addMatcher(
46  arraySubscriptExpr(
47  hasBase(ignoringImpCasts(
48  anyOf(AllPointerTypes,
49  hasType(decayedType(hasDecayedType(pointerType())))))))
50  .bind("expr"),
51  this);
52 }
53 
54 void ProBoundsPointerArithmeticCheck::check(
55  const MatchFinder::MatchResult &Result) {
56  const auto *MatchedExpr = Result.Nodes.getNodeAs<Expr>("expr");
57 
58  diag(MatchedExpr->getExprLoc(), "do not use pointer arithmetic");
59 }
60 
61 } // namespace cppcoreguidelines
62 } // namespace tidy
63 } // namespace clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//