clang-tools  14.0.0git
UndefinedMemoryManipulationCheck.cpp
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1 //===--- UndefinedMemoryManipulationCheck.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 bugprone {
18 
19 namespace {
20 AST_MATCHER(CXXRecordDecl, isNotTriviallyCopyable) {
21  // For incomplete types, assume they are TriviallyCopyable.
22  return Node.hasDefinition() ? !Node.isTriviallyCopyable() : false;
23 }
24 } // namespace
25 
26 void UndefinedMemoryManipulationCheck::registerMatchers(MatchFinder *Finder) {
27  const auto NotTriviallyCopyableObject =
28  hasType(ast_matchers::hasCanonicalType(
29  pointsTo(cxxRecordDecl(isNotTriviallyCopyable()))));
30 
31  // Check whether destination object is not TriviallyCopyable.
32  // Applicable to all three memory manipulation functions.
33  Finder->addMatcher(callExpr(callee(functionDecl(hasAnyName(
34  "::memset", "::memcpy", "::memmove"))),
35  hasArgument(0, NotTriviallyCopyableObject))
36  .bind("dest"),
37  this);
38 
39  // Check whether source object is not TriviallyCopyable.
40  // Only applicable to memcpy() and memmove().
41  Finder->addMatcher(
42  callExpr(callee(functionDecl(hasAnyName("::memcpy", "::memmove"))),
43  hasArgument(1, NotTriviallyCopyableObject))
44  .bind("src"),
45  this);
46 }
47 
49  const MatchFinder::MatchResult &Result) {
50  if (const auto *Call = Result.Nodes.getNodeAs<CallExpr>("dest")) {
51  QualType DestType = Call->getArg(0)->IgnoreImplicit()->getType();
52  if (!DestType->getPointeeType().isNull())
53  DestType = DestType->getPointeeType();
54  diag(Call->getBeginLoc(), "undefined behavior, destination object type %0 "
55  "is not TriviallyCopyable")
56  << DestType;
57  }
58  if (const auto *Call = Result.Nodes.getNodeAs<CallExpr>("src")) {
59  QualType SourceType = Call->getArg(1)->IgnoreImplicit()->getType();
60  if (!SourceType->getPointeeType().isNull())
61  SourceType = SourceType->getPointeeType();
62  diag(Call->getBeginLoc(),
63  "undefined behavior, source object type %0 is not TriviallyCopyable")
64  << SourceType;
65  }
66 }
67 
68 } // namespace bugprone
69 } // namespace tidy
70 } // namespace clang
UndefinedMemoryManipulationCheck.h
clang::ast_matchers
Definition: AbseilMatcher.h:14
clang::ast_matchers::AST_MATCHER
AST_MATCHER(Expr, isMacroID)
Definition: PreferIsaOrDynCastInConditionalsCheck.cpp:19
clang::clangd::check
bool check(llvm::StringRef File, llvm::function_ref< bool(const Position &)> ShouldCheckLine, const ThreadsafeFS &TFS, const ClangdLSPServer::Options &Opts, bool EnableCodeCompletion)
Definition: Check.cpp:259
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ApplyReplacements.h:27