clang-tools  9.0.0
ProBoundsPointerArithmeticCheck.cpp
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1 //===--- ProBoundsPointerArithmeticCheck.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 
10 #include "clang/AST/ASTContext.h"
11 #include "clang/ASTMatchers/ASTMatchFinder.h"
12 
13 using namespace clang::ast_matchers;
14 
15 namespace clang {
16 namespace tidy {
17 namespace cppcoreguidelines {
18 
19 void ProBoundsPointerArithmeticCheck::registerMatchers(MatchFinder *Finder) {
20  if (!getLangOpts().CPlusPlus)
21  return;
22 
23  const auto AllPointerTypes = anyOf(
24  hasType(pointerType()), hasType(autoType(hasDeducedType(pointerType()))),
25  hasType(decltypeType(hasUnderlyingType(pointerType()))));
26 
27  // Flag all operators +, -, +=, -=, ++, -- that result in a pointer
28  Finder->addMatcher(
29  binaryOperator(
30  anyOf(hasOperatorName("+"), hasOperatorName("-"),
31  hasOperatorName("+="), hasOperatorName("-=")),
32  AllPointerTypes,
33  unless(hasLHS(ignoringImpCasts(declRefExpr(to(isImplicit()))))))
34  .bind("expr"),
35  this);
36 
37  Finder->addMatcher(
38  unaryOperator(anyOf(hasOperatorName("++"), hasOperatorName("--")),
39  hasType(pointerType()))
40  .bind("expr"),
41  this);
42 
43  // Array subscript on a pointer (not an array) is also pointer arithmetic
44  Finder->addMatcher(
45  arraySubscriptExpr(
46  hasBase(ignoringImpCasts(
47  anyOf(AllPointerTypes,
48  hasType(decayedType(hasDecayedType(pointerType())))))))
49  .bind("expr"),
50  this);
51 }
52 
53 void ProBoundsPointerArithmeticCheck::check(
54  const MatchFinder::MatchResult &Result) {
55  const auto *MatchedExpr = Result.Nodes.getNodeAs<Expr>("expr");
56 
57  diag(MatchedExpr->getExprLoc(), "do not use pointer arithmetic");
58 }
59 
60 } // namespace cppcoreguidelines
61 } // namespace tidy
62 } // namespace clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
llvm::Optional< llvm::Expected< tooling::AtomicChanges > > Result
Definition: Rename.cpp:36
bool hasDeducedType(ParsedAST &AST, SourceLocation SourceLocationBeg)
Retrieves the deduced type at a given location (auto, decltype).
Definition: XRefs.cpp:895