clang-tools 10.0.0

InterfacesGlobalInitCheck.cpp
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1 //===--- InterfacesGlobalInitCheck.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 "InterfacesGlobalInitCheck.h"
10 #include "clang/AST/ASTContext.h"
11 #include "clang/ASTMatchers/ASTMatchFinder.h"
12
13 using namespace clang::ast_matchers;
14
15 namespace clang {
16 namespace tidy {
17 namespace cppcoreguidelines {
18
19 void InterfacesGlobalInitCheck::registerMatchers(MatchFinder *Finder) {
20 const auto GlobalVarDecl =
21 varDecl(hasGlobalStorage(),
22 hasDeclContext(anyOf(translationUnitDecl(), // Global scope.
23 namespaceDecl(), // Namespace scope.
24 recordDecl())), // Class scope.
25 unless(isConstexpr()));
26
27 const auto ReferencesUndefinedGlobalVar = declRefExpr(hasDeclaration(
28 varDecl(GlobalVarDecl, unless(isDefinition())).bind("referencee")));
29
30 Finder->addMatcher(
31 varDecl(GlobalVarDecl, isDefinition(),
32 hasInitializer(expr(hasDescendant(ReferencesUndefinedGlobalVar))))
33 .bind("var"),
34 this);
35 }
36
37 void InterfacesGlobalInitCheck::check(const MatchFinder::MatchResult &Result) {
38 const auto *const Var = Result.Nodes.getNodeAs<VarDecl>("var");
39 // For now assume that people who write macros know what they're doing.
40 if (Var->getLocation().isMacroID())
41 return;
42 const auto *const Referencee = Result.Nodes.getNodeAs<VarDecl>("referencee");
43 // If the variable has been defined, we're good.
44 const auto *const ReferenceeDef = Referencee->getDefinition();
45 if (ReferenceeDef != nullptr &&
46 Result.SourceManager->isBeforeInTranslationUnit(
47 ReferenceeDef->getLocation(), Var->getLocation())) {
48 return;
49 }
50 diag(Var->getLocation(),
51 "initializing non-local variable with non-const expression depending on "
52 "uninitialized non-local variable %0")
53 << Referencee;
54 }
55
56 } // namespace cppcoreguidelines
57 } // namespace tidy
58 } // namespace clang
InterfacesGlobalInitCheck.h
clang::ast_matchers
Definition: AbseilMatcher.h:14
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ApplyReplacements.h:27