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//===--- 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 {
namespace tidy {
namespace 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) {
// This checker only applies to C++, where exception handling is a superior
// solution to setjmp/longjmp calls.
if (!getLangOpts().CPlusPlus)
return;
// 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(llvm::make_unique<SetJmpMacroCallbacks>(*this));
}
void SetLongJmpCheck::registerMatchers(MatchFinder *Finder) {
// This checker only applies to C++, where exception handling is a superior
// solution to setjmp/longjmp calls.
if (!getLangOpts().CPlusPlus)
return;
// 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 cert
} // namespace tidy
} // namespace clang
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