1 | //===--- DynamicStaticInitializersCheck.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 "DynamicStaticInitializersCheck.h" |
10 | #include "../utils/FileExtensionsUtils.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::bugprone { |
17 | |
18 | namespace { |
19 | |
20 | AST_MATCHER(clang::VarDecl, hasConstantDeclaration) { |
21 | const Expr *Init = Node.getInit(); |
22 | if (Init && !Init->isValueDependent()) { |
23 | if (Node.isConstexpr()) |
24 | return true; |
25 | return Node.evaluateValue(); |
26 | } |
27 | return false; |
28 | } |
29 | |
30 | } // namespace |
31 | |
32 | DynamicStaticInitializersCheck::DynamicStaticInitializersCheck( |
33 | StringRef Name, ClangTidyContext *Context) |
34 | : ClangTidyCheck(Name, Context), |
35 | HeaderFileExtensions(Context->getHeaderFileExtensions()) {} |
36 | |
37 | void DynamicStaticInitializersCheck::registerMatchers(MatchFinder *Finder) { |
38 | Finder->addMatcher( |
39 | NodeMatch: varDecl(hasGlobalStorage(), unless(hasConstantDeclaration())).bind(ID: "var"), |
40 | Action: this); |
41 | } |
42 | |
43 | void DynamicStaticInitializersCheck::check( |
44 | const MatchFinder::MatchResult &Result) { |
45 | const auto *Var = Result.Nodes.getNodeAs<VarDecl>(ID: "var"); |
46 | SourceLocation Loc = Var->getLocation(); |
47 | if (!Loc.isValid() || !utils::isPresumedLocInHeaderFile( |
48 | Loc, SM&: *Result.SourceManager, HeaderFileExtensions)) |
49 | return; |
50 | // If the initializer is a constant expression, then the compiler |
51 | // doesn't have to dynamically initialize it. |
52 | diag(Loc, |
53 | Description: "static variable %0 may be dynamically initialized in this header file") |
54 | << Var; |
55 | } |
56 | |
57 | } // namespace clang::tidy::bugprone |
58 |