| 1 | //===--- DynamicStaticInitializersCheck.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 "DynamicStaticInitializersCheck.h" |
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| 10 | #include "../utils/FileExtensionsUtils.h" |
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| 11 | #include "clang/AST/ASTContext.h" |
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| 12 | #include "clang/ASTMatchers/ASTMatchFinder.h" |
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| 13 | |
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| 14 | using namespace clang::ast_matchers; |
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| 15 | |
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| 16 | namespace clang::tidy::bugprone { |
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| 17 | |
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| 18 | namespace { |
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| 19 | |
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| 20 | AST_MATCHER(clang::VarDecl, hasConstantDeclaration) { |
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| 21 | const Expr *Init = Node.getInit(); |
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| 22 | if (Init && !Init->isValueDependent()) { |
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| 23 | if (Node.isConstexpr()) |
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| 24 | return true; |
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| 25 | return Node.evaluateValue(); |
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| 26 | } |
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| 27 | return false; |
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| 28 | } |
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| 29 | |
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| 30 | } // namespace |
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| 31 | |
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| 32 | DynamicStaticInitializersCheck::DynamicStaticInitializersCheck( |
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| 33 | StringRef Name, ClangTidyContext *Context) |
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| 34 | : ClangTidyCheck(Name, Context), |
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| 35 | HeaderFileExtensions(Context->getHeaderFileExtensions()) {} |
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| 36 | |
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| 37 | void DynamicStaticInitializersCheck::registerMatchers(MatchFinder *Finder) { |
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| 38 | Finder->addMatcher( |
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| 39 | NodeMatch: varDecl(hasGlobalStorage(), unless(hasConstantDeclaration())).bind(ID: "var" ), |
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| 40 | Action: this); |
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| 41 | } |
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| 42 | |
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| 43 | void DynamicStaticInitializersCheck::check( |
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| 44 | const MatchFinder::MatchResult &Result) { |
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| 45 | const auto *Var = Result.Nodes.getNodeAs<VarDecl>(ID: "var" ); |
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| 46 | SourceLocation Loc = Var->getLocation(); |
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| 47 | if (!Loc.isValid() || !utils::isPresumedLocInHeaderFile( |
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| 48 | Loc, SM&: *Result.SourceManager, HeaderFileExtensions)) |
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| 49 | return; |
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| 50 | // If the initializer is a constant expression, then the compiler |
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| 51 | // doesn't have to dynamically initialize it. |
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| 52 | diag(Loc, |
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| 53 | Description: "static variable %0 may be dynamically initialized in this header file" ) |
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| 54 | << Var; |
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| 55 | } |
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| 56 | |
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| 57 | } // namespace clang::tidy::bugprone |
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| 58 | |
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