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 {
17 namespace tidy {
18 namespace cert {
19 
20 void StaticObjectExceptionCheck::registerMatchers(MatchFinder *Finder) {
21   // Match any static or thread_local variable declaration that has an
22   // initializer that can throw.
23   Finder->addMatcher(
24       traverse(
25           TK_AsIs,
26           varDecl(
27               anyOf(hasThreadStorageDuration(), hasStaticStorageDuration()),
28               unless(anyOf(isConstexpr(), hasType(cxxRecordDecl(isLambda())),
29                            hasAncestor(functionDecl()))),
30               anyOf(hasDescendant(cxxConstructExpr(hasDeclaration(
31                         cxxConstructorDecl(unless(isNoThrow())).bind("func")))),
32                     hasDescendant(cxxNewExpr(hasDeclaration(
33                         functionDecl(unless(isNoThrow())).bind("func")))),
34                     hasDescendant(callExpr(hasDeclaration(
35                         functionDecl(unless(isNoThrow())).bind("func"))))))
36               .bind("var")),
37       this);
38 }
39 
40 void StaticObjectExceptionCheck::check(const MatchFinder::MatchResult &Result) {
41   const auto *VD = Result.Nodes.getNodeAs<VarDecl>("var");
42   const auto *Func = Result.Nodes.getNodeAs<FunctionDecl>("func");
43 
44   diag(VD->getLocation(),
45        "initialization of %0 with %select{static|thread_local}1 storage "
46        "duration may throw an exception that cannot be caught")
47       << VD << (VD->getStorageDuration() == SD_Static ? 0 : 1);
48 
49   SourceLocation FuncLocation = Func->getLocation();
50   if (FuncLocation.isValid()) {
51     diag(FuncLocation,
52          "possibly throwing %select{constructor|function}0 declared here",
53          DiagnosticIDs::Note)
54         << (isa<CXXConstructorDecl>(Func) ? 0 : 1);
55   }
56 }
57 
58 } // namespace cert
59 } // namespace tidy
60 } // namespace clang
61