clang-tools 10.0.0

StaticallyConstructedObjectsCheck.cpp
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1 //===--- StaticallyConstructedObjectsCheck.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 "StaticallyConstructedObjectsCheck.h"
10
11 using namespace clang::ast_matchers;
12
13 namespace clang {
14 namespace tidy {
15 namespace fuchsia {
16
17 namespace {
18 AST_MATCHER(Expr, isConstantInitializer) {
19 return Node.isConstantInitializer(Finder->getASTContext(), false);
20 }
21
22 AST_MATCHER(VarDecl, isGlobalStatic) {
23 return Node.getStorageDuration() == SD_Static && !Node.isLocalVarDecl();
24 }
25 } // namespace
26
27 void StaticallyConstructedObjectsCheck::registerMatchers(MatchFinder *Finder) {
28 // Constructing global, non-trivial objects with static storage is
29 // disallowed, unless the object is statically initialized with a constexpr
30 // constructor or has no explicit constructor.
31
32 // Constexpr requires C++11 or later.
33 if (!getLangOpts().CPlusPlus11)
34 return;
35
36 Finder->addMatcher(varDecl(
37 // Match global, statically stored objects...
38 isGlobalStatic(),
39 // ... that have C++ constructors...
40 hasDescendant(cxxConstructExpr(unless(allOf(
41 // ... unless it is constexpr ...
42 hasDeclaration(cxxConstructorDecl(isConstexpr())),
43 // ... and is statically initialized.
44 isConstantInitializer())))))
45 .bind("decl"),
46 this);
47 }
48
49 void StaticallyConstructedObjectsCheck::check(
50 const MatchFinder::MatchResult &Result) {
51 if (const auto *D = Result.Nodes.getNodeAs<VarDecl>("decl"))
52 diag(D->getBeginLoc(), "static objects are disallowed; if possible, use a "
53 "constexpr constructor instead");
54 }
55
56 } // namespace fuchsia
57 } // namespace tidy
58 } // namespace clang
clang::ast_matchers
Definition: AbseilMatcher.h:14
clang::ast_matchers::AST_MATCHER
AST_MATCHER(Expr, isMacroID)
Definition: PreferIsaOrDynCastInConditionalsCheck.cpp:18
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ApplyReplacements.h:27
StaticallyConstructedObjectsCheck.h