File: SetLongJmpCheck.cpp

package info (click to toggle)
llvm-toolchain-17 1%3A17.0.6-22
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,799,624 kB
  • sloc: cpp: 6,428,607; ansic: 1,383,196; asm: 793,408; python: 223,504; objc: 75,364; f90: 60,502; lisp: 33,869; pascal: 15,282; sh: 9,684; perl: 7,453; ml: 4,937; awk: 3,523; makefile: 2,889; javascript: 2,149; xml: 888; fortran: 619; cs: 573
file content (65 lines) | stat: -rw-r--r-- 2,342 bytes parent folder | download | duplicates (12)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
//===--- SetLongJmpCheck.cpp - clang-tidy----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "SetLongJmpCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Lex/PPCallbacks.h"
#include "clang/Lex/Preprocessor.h"

using namespace clang::ast_matchers;

namespace clang::tidy::cert {

namespace {
const char DiagWording[] =
    "do not call %0; consider using exception handling instead";

class SetJmpMacroCallbacks : public PPCallbacks {
  SetLongJmpCheck &Check;

public:
  explicit SetJmpMacroCallbacks(SetLongJmpCheck &Check) : Check(Check) {}

  void MacroExpands(const Token &MacroNameTok, const MacroDefinition &MD,
                    SourceRange Range, const MacroArgs *Args) override {
    const auto *II = MacroNameTok.getIdentifierInfo();
    if (!II)
      return;

    if (II->getName() == "setjmp")
      Check.diag(Range.getBegin(), DiagWording) << II;
  }
};
} // namespace

void SetLongJmpCheck::registerPPCallbacks(const SourceManager &SM,
                                          Preprocessor *PP,
                                          Preprocessor *ModuleExpanderPP) {
  // Per [headers]p5, setjmp must be exposed as a macro instead of a function,
  // despite the allowance in C for setjmp to also be an extern function.
  PP->addPPCallbacks(std::make_unique<SetJmpMacroCallbacks>(*this));
}

void SetLongJmpCheck::registerMatchers(MatchFinder *Finder) {
  // In case there is an implementation that happens to define setjmp as a
  // function instead of a macro, this will also catch use of it. However, we
  // are primarily searching for uses of longjmp.
  Finder->addMatcher(
      callExpr(callee(functionDecl(hasAnyName("setjmp", "longjmp"))))
          .bind("expr"),
      this);
}

void SetLongJmpCheck::check(const MatchFinder::MatchResult &Result) {
  const auto *E = Result.Nodes.getNodeAs<CallExpr>("expr");
  diag(E->getExprLoc(), DiagWording) << cast<NamedDecl>(E->getCalleeDecl());
}

} // namespace clang::tidy::cert