clang-tools 20.0.0git
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
16using namespace clang::ast_matchers;
17
18namespace clang::tidy::cert {
19
20namespace {
21const char DiagWording[] =
22 "do not call %0; consider using exception handling instead";
23
24class SetJmpMacroCallbacks : public PPCallbacks {
25 SetLongJmpCheck &Check;
26
27public:
28 explicit SetJmpMacroCallbacks(SetLongJmpCheck &Check) : Check(Check) {}
29
30 void MacroExpands(const Token &MacroNameTok, const MacroDefinition &MD,
31 SourceRange Range, const MacroArgs *Args) override {
32 const auto *II = MacroNameTok.getIdentifierInfo();
33 if (!II)
34 return;
35
36 if (II->getName() == "setjmp")
37 Check.diag(Range.getBegin(), DiagWording) << II;
38 }
39};
40} // namespace
41
42void SetLongJmpCheck::registerPPCallbacks(const SourceManager &SM,
43 Preprocessor *PP,
44 Preprocessor *ModuleExpanderPP) {
45 // Per [headers]p5, setjmp must be exposed as a macro instead of a function,
46 // despite the allowance in C for setjmp to also be an extern function.
47 PP->addPPCallbacks(std::make_unique<SetJmpMacroCallbacks>(*this));
48}
49
50void SetLongJmpCheck::registerMatchers(MatchFinder *Finder) {
51 // In case there is an implementation that happens to define setjmp as a
52 // function instead of a macro, this will also catch use of it. However, we
53 // are primarily searching for uses of longjmp.
54 Finder->addMatcher(
55 callExpr(callee(functionDecl(hasAnyName("setjmp", "longjmp"))))
56 .bind("expr"),
57 this);
58}
59
60void SetLongJmpCheck::check(const MatchFinder::MatchResult &Result) {
61 const auto *E = Result.Nodes.getNodeAs<CallExpr>("expr");
62 diag(E->getExprLoc(), DiagWording) << cast<NamedDecl>(E->getCalleeDecl());
63}
64
65} // namespace clang::tidy::cert
const Expr * E
CharSourceRange Range
SourceRange for the file name.
llvm::json::Object Args
Definition: Trace.cpp:138
DiagnosticBuilder diag(SourceLocation Loc, StringRef Description, DiagnosticIDs::Level Level=DiagnosticIDs::Warning)
Add a diagnostic with the check's name.
void check(const ast_matchers::MatchFinder::MatchResult &Result) override
ClangTidyChecks that register ASTMatchers should do the actual work in here.
void registerMatchers(ast_matchers::MatchFinder *Finder) override
Override this to register AST matchers with Finder.
void registerPPCallbacks(const SourceManager &SM, Preprocessor *PP, Preprocessor *ModuleExpanderPP) override
Override this to register PPCallbacks in the preprocessor.