clang-tools  10.0.0git
BadSignalToKillThreadCheck.cpp
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1 //===--- BadSignalToKillThreadCheck.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 void BadSignalToKillThreadCheck::registerMatchers(MatchFinder *Finder) {
20  Finder->addMatcher(
21  callExpr(allOf(callee(functionDecl(hasName("::pthread_kill"))),
22  argumentCountIs(2)),
23  hasArgument(1, integerLiteral().bind("integer-literal")))
24  .bind("thread-kill"),
25  this);
26 }
27 
28 static Preprocessor *PP;
29 
30 void BadSignalToKillThreadCheck::check(const MatchFinder::MatchResult &Result) {
31  const auto IsSigterm = [](const auto &KeyValue) -> bool {
32  return KeyValue.first->getName() == "SIGTERM";
33  };
34  const auto TryExpandAsInteger =
35  [](Preprocessor::macro_iterator It) -> Optional<unsigned> {
36  if (It == PP->macro_end())
37  return llvm::None;
38  const MacroInfo *MI = PP->getMacroInfo(It->first);
39  const Token &T = MI->tokens().back();
40  StringRef ValueStr = StringRef(T.getLiteralData(), T.getLength());
41 
42  llvm::APInt IntValue;
43  constexpr unsigned AutoSenseRadix = 0;
44  if (ValueStr.getAsInteger(AutoSenseRadix, IntValue))
45  return llvm::None;
46  return IntValue.getZExtValue();
47  };
48 
49  const auto SigtermMacro = llvm::find_if(PP->macros(), IsSigterm);
50 
51  if (!SigtermValue && !(SigtermValue = TryExpandAsInteger(SigtermMacro)))
52  return;
53 
54  const auto *MatchedExpr = Result.Nodes.getNodeAs<Expr>("thread-kill");
55  const auto *MatchedIntLiteral =
56  Result.Nodes.getNodeAs<IntegerLiteral>("integer-literal");
57  if (MatchedIntLiteral->getValue() == *SigtermValue) {
58  diag(MatchedExpr->getBeginLoc(),
59  "thread should not be terminated by raising the 'SIGTERM' signal");
60  }
61 }
62 
63 void BadSignalToKillThreadCheck::registerPPCallbacks(
64  const SourceManager &SM, Preprocessor *pp, Preprocessor *ModuleExpanderPP) {
65  PP = pp;
66 }
67 
68 } // namespace bugprone
69 } // namespace tidy
70 } // namespace clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//