clang-tools  8.0.0svn
SetLongJmpCheck.cpp
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1 //===--- SetLongJmpCheck.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 "SetLongJmpCheck.h"
11 #include "clang/AST/ASTContext.h"
12 #include "clang/ASTMatchers/ASTMatchFinder.h"
13 #include "clang/Frontend/CompilerInstance.h"
14 #include "clang/Lex/PPCallbacks.h"
15 #include "clang/Lex/Preprocessor.h"
16 
17 using namespace clang::ast_matchers;
18 
19 namespace clang {
20 namespace tidy {
21 namespace cert {
22 
23 const char SetLongJmpCheck::DiagWording[] =
24  "do not call %0; consider using exception handling instead";
25 
26 namespace {
27 class SetJmpMacroCallbacks : public PPCallbacks {
28  SetLongJmpCheck &Check;
29 
30 public:
31  explicit SetJmpMacroCallbacks(SetLongJmpCheck &Check) : Check(Check) {}
32 
33  void MacroExpands(const Token &MacroNameTok, const MacroDefinition &MD,
34  SourceRange Range, const MacroArgs *Args) override {
35  const auto *II = MacroNameTok.getIdentifierInfo();
36  if (!II)
37  return;
38 
39  if (II->getName() == "setjmp")
40  Check.diag(Range.getBegin(), Check.DiagWording) << II;
41  }
42 };
43 } // namespace
44 
45 void SetLongJmpCheck::registerPPCallbacks(CompilerInstance &Compiler) {
46  // This checker only applies to C++, where exception handling is a superior
47  // solution to setjmp/longjmp calls.
48  if (!getLangOpts().CPlusPlus)
49  return;
50 
51  // Per [headers]p5, setjmp must be exposed as a macro instead of a function,
52  // despite the allowance in C for setjmp to also be an extern function.
53  Compiler.getPreprocessor().addPPCallbacks(
54  llvm::make_unique<SetJmpMacroCallbacks>(*this));
55 }
56 
57 void SetLongJmpCheck::registerMatchers(MatchFinder *Finder) {
58  // This checker only applies to C++, where exception handling is a superior
59  // solution to setjmp/longjmp calls.
60  if (!getLangOpts().CPlusPlus)
61  return;
62 
63  // In case there is an implementation that happens to define setjmp as a
64  // function instead of a macro, this will also catch use of it. However, we
65  // are primarily searching for uses of longjmp.
66  Finder->addMatcher(callExpr(callee(functionDecl(anyOf(hasName("setjmp"),
67  hasName("longjmp")))))
68  .bind("expr"),
69  this);
70 }
71 
72 void SetLongJmpCheck::check(const MatchFinder::MatchResult &Result) {
73  const auto *E = Result.Nodes.getNodeAs<CallExpr>("expr");
74  diag(E->getExprLoc(), DiagWording) << cast<NamedDecl>(E->getCalleeDecl());
75 }
76 
77 } // namespace cert
78 } // namespace tidy
79 } // namespace clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
CharSourceRange Range
SourceRange for the file name.