forked from OSchip/llvm-project
80 lines
2.7 KiB
C++
80 lines
2.7 KiB
C++
//===--- SetLongJmpCheck.cpp - clang-tidy----------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "SetLongJmpCheck.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/ASTMatchers/ASTMatchFinder.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "clang/Lex/PPCallbacks.h"
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#include "clang/Lex/Preprocessor.h"
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using namespace clang::ast_matchers;
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namespace clang {
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namespace tidy {
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namespace cert {
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namespace {
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const char DiagWording[] =
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"do not call %0; consider using exception handling instead";
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class SetJmpMacroCallbacks : public PPCallbacks {
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SetLongJmpCheck &Check;
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public:
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explicit SetJmpMacroCallbacks(SetLongJmpCheck &Check) : Check(Check) {}
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void MacroExpands(const Token &MacroNameTok, const MacroDefinition &MD,
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SourceRange Range, const MacroArgs *Args) override {
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const auto *II = MacroNameTok.getIdentifierInfo();
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if (!II)
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return;
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if (II->getName() == "setjmp")
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Check.diag(Range.getBegin(), DiagWording) << II;
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}
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};
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} // namespace
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void SetLongJmpCheck::registerPPCallbacks(const SourceManager &SM,
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Preprocessor *PP,
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Preprocessor *ModuleExpanderPP) {
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// This checker only applies to C++, where exception handling is a superior
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// solution to setjmp/longjmp calls.
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if (!getLangOpts().CPlusPlus)
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return;
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// Per [headers]p5, setjmp must be exposed as a macro instead of a function,
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// despite the allowance in C for setjmp to also be an extern function.
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PP->addPPCallbacks(std::make_unique<SetJmpMacroCallbacks>(*this));
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}
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void SetLongJmpCheck::registerMatchers(MatchFinder *Finder) {
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// This checker only applies to C++, where exception handling is a superior
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// solution to setjmp/longjmp calls.
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if (!getLangOpts().CPlusPlus)
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return;
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// In case there is an implementation that happens to define setjmp as a
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// function instead of a macro, this will also catch use of it. However, we
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// are primarily searching for uses of longjmp.
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Finder->addMatcher(
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callExpr(callee(functionDecl(hasAnyName("setjmp", "longjmp"))))
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.bind("expr"),
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this);
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}
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void SetLongJmpCheck::check(const MatchFinder::MatchResult &Result) {
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const auto *E = Result.Nodes.getNodeAs<CallExpr>("expr");
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diag(E->getExprLoc(), DiagWording) << cast<NamedDecl>(E->getCalleeDecl());
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}
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} // namespace cert
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} // namespace tidy
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} // namespace clang
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