| 1 | //===--- SetLongJmpCheck.cpp - clang-tidy----------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "SetLongJmpCheck.h" |
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| 10 | #include "clang/AST/ASTContext.h" |
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| 11 | #include "clang/ASTMatchers/ASTMatchFinder.h" |
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| 12 | #include "clang/Frontend/CompilerInstance.h" |
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| 13 | #include "clang/Lex/PPCallbacks.h" |
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| 14 | #include "clang/Lex/Preprocessor.h" |
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| 15 | |
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| 16 | using namespace clang::ast_matchers; |
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| 17 | |
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| 18 | namespace clang::tidy::cert { |
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| 19 | |
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| 20 | namespace { |
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| 21 | const char DiagWording[] = |
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| 22 | "do not call %0; consider using exception handling instead" ; |
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| 23 | |
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| 24 | class SetJmpMacroCallbacks : public PPCallbacks { |
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| 25 | SetLongJmpCheck &Check; |
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| 26 | |
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| 27 | public: |
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| 28 | explicit SetJmpMacroCallbacks(SetLongJmpCheck &Check) : Check(Check) {} |
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| 29 | |
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| 30 | void MacroExpands(const Token &MacroNameTok, const MacroDefinition &MD, |
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| 31 | SourceRange Range, const MacroArgs *Args) override { |
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| 32 | const auto *II = MacroNameTok.getIdentifierInfo(); |
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| 33 | if (!II) |
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| 34 | return; |
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| 35 | |
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| 36 | if (II->getName() == "setjmp" ) |
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| 37 | Check.diag(Loc: Range.getBegin(), Description: DiagWording) << II; |
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| 38 | } |
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| 39 | }; |
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| 40 | } // namespace |
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| 41 | |
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| 42 | void SetLongJmpCheck::registerPPCallbacks(const SourceManager &SM, |
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| 43 | Preprocessor *PP, |
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| 44 | Preprocessor *ModuleExpanderPP) { |
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| 45 | // Per [headers]p5, setjmp must be exposed as a macro instead of a function, |
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| 46 | // despite the allowance in C for setjmp to also be an extern function. |
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| 47 | PP->addPPCallbacks(C: std::make_unique<SetJmpMacroCallbacks>(args&: *this)); |
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| 48 | } |
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| 49 | |
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| 50 | void SetLongJmpCheck::registerMatchers(MatchFinder *Finder) { |
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| 51 | // In case there is an implementation that happens to define setjmp as a |
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| 52 | // function instead of a macro, this will also catch use of it. However, we |
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| 53 | // are primarily searching for uses of longjmp. |
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| 54 | Finder->addMatcher( |
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| 55 | NodeMatch: callExpr(callee(InnerMatcher: functionDecl(hasAnyName("setjmp" , "longjmp" )))) |
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| 56 | .bind(ID: "expr" ), |
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| 57 | Action: this); |
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| 58 | } |
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| 59 | |
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| 60 | void SetLongJmpCheck::check(const MatchFinder::MatchResult &Result) { |
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| 61 | const auto *E = Result.Nodes.getNodeAs<CallExpr>(ID: "expr" ); |
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| 62 | diag(E->getExprLoc(), DiagWording) << cast<NamedDecl>(Val: E->getCalleeDecl()); |
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| 63 | } |
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| 64 | |
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| 65 | } // namespace clang::tidy::cert |
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| 66 | |
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