clang-tools  9.0.0svn
SetLongJmpCheck.cpp
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1 //===--- SetLongJmpCheck.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 
9 #include "SetLongJmpCheck.h"
10 #include "clang/AST/ASTContext.h"
11 #include "clang/ASTMatchers/ASTMatchFinder.h"
12 #include "clang/Frontend/CompilerInstance.h"
13 #include "clang/Lex/PPCallbacks.h"
14 #include "clang/Lex/Preprocessor.h"
15 
16 using namespace clang::ast_matchers;
17 
18 namespace clang {
19 namespace tidy {
20 namespace cert {
21 
22 namespace {
23 const char DiagWording[] =
24  "do not call %0; consider using exception handling instead";
25 
26 class SetJmpMacroCallbacks : public PPCallbacks {
27  SetLongJmpCheck &Check;
28 
29 public:
30  explicit SetJmpMacroCallbacks(SetLongJmpCheck &Check) : Check(Check) {}
31 
32  void MacroExpands(const Token &MacroNameTok, const MacroDefinition &MD,
33  SourceRange Range, const MacroArgs *Args) override {
34  const auto *II = MacroNameTok.getIdentifierInfo();
35  if (!II)
36  return;
37 
38  if (II->getName() == "setjmp")
39  Check.diag(Range.getBegin(), DiagWording) << II;
40  }
41 };
42 } // namespace
43 
44 void SetLongJmpCheck::registerPPCallbacks(const SourceManager &SM,
45  Preprocessor *PP,
46  Preprocessor *ModuleExpanderPP) {
47  // This checker only applies to C++, where exception handling is a superior
48  // solution to setjmp/longjmp calls.
49  if (!getLangOpts().CPlusPlus)
50  return;
51 
52  // Per [headers]p5, setjmp must be exposed as a macro instead of a function,
53  // despite the allowance in C for setjmp to also be an extern function.
54  PP->addPPCallbacks(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(
67  callExpr(callee(functionDecl(hasAnyName("setjmp", "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++ -*-===//
static GeneratorRegistry::Add< MDGenerator > MD(MDGenerator::Format, "Generator for MD output.")
CharSourceRange Range
SourceRange for the file name.
llvm::Optional< llvm::Expected< tooling::AtomicChanges > > Result
Definition: Rename.cpp:25