clang-tools 8.0.0

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 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
clang::ast_matchers
Definition: AbseilMatcher.h:15
Result
llvm::Optional< llvm::Expected< tooling::AtomicChanges > > Result
Definition: ClangdServer.cpp:60
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ChangeNamespace.cpp:18
ProBoundsPointerArithmeticCheck.h