clang-tools-extra/clang-tidy/cert/StaticObjectExceptionCheck.cpp

   1 //===--- StaticObjectExceptionCheck.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 "StaticObjectExceptionCheck.h"
  10 #include "../utils/Matchers.h"
  11 #include "clang/AST/ASTContext.h"
  12 #include "clang/ASTMatchers/ASTMatchFinder.h"
  13
  14 using namespace clang::ast_matchers;
  15
  16 namespace clang::tidy::cert {
  17
  18 void StaticObjectExceptionCheck::registerMatchers(MatchFinder *Finder) {
  19   // Match any static or thread_local variable declaration that has an
  20   // initializer that can throw.
  21   Finder->addMatcher(
  22       traverse(
  23           TK_AsIs,
  24           varDecl(
  25               anyOf(hasThreadStorageDuration(), hasStaticStorageDuration()),
  26               unless(anyOf(isConstexpr(), hasType(cxxRecordDecl(isLambda())),
  27                            hasAncestor(functionDecl()))),
  28               anyOf(hasDescendant(cxxConstructExpr(hasDeclaration(
  29                         cxxConstructorDecl(unless(isNoThrow())).bind("func")))),
  30                     hasDescendant(cxxNewExpr(hasDeclaration(
  31                         functionDecl(unless(isNoThrow())).bind("func")))),
  32                     hasDescendant(callExpr(hasDeclaration(
  33                         functionDecl(unless(isNoThrow())).bind("func"))))))
  34               .bind("var")),
  35       this);
  36 }
  37
  38 void StaticObjectExceptionCheck::check(const MatchFinder::MatchResult &Result) {
  39   const auto *VD = Result.Nodes.getNodeAs<VarDecl>("var");
  40   const auto *Func = Result.Nodes.getNodeAs<FunctionDecl>("func");
  41
  42   diag(VD->getLocation(),
  43        "initialization of %0 with %select{static|thread_local}1 storage "
  44        "duration may throw an exception that cannot be caught")
  45       << VD << (VD->getStorageDuration() == SD_Static ? 0 : 1);
  46
  47   SourceLocation FuncLocation = Func->getLocation();
  48   if (FuncLocation.isValid()) {
  49     diag(FuncLocation,
  50          "possibly throwing %select{constructor|function}0 declared here",
  51          DiagnosticIDs::Note)
  52         << (isa<CXXConstructorDecl>(Func) ? 0 : 1);
  53   }
  54 }
  55
  56 } // namespace clang::tidy::cert