clang-tools 6.0.0

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