clang-tools  16.0.0git
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 
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  traverse(TK_AsIs, varDecl(GlobalVarDecl, isDefinition(),
32  hasInitializer(expr(hasDescendant(
33  ReferencesUndefinedGlobalVar))))
34  .bind("var")),
35  this);
36 }
37 
38 void InterfacesGlobalInitCheck::check(const MatchFinder::MatchResult &Result) {
39  const auto *const Var = Result.Nodes.getNodeAs<VarDecl>("var");
40  // For now assume that people who write macros know what they're doing.
41  if (Var->getLocation().isMacroID())
42  return;
43  const auto *const Referencee = Result.Nodes.getNodeAs<VarDecl>("referencee");
44  // If the variable has been defined, we're good.
45  const auto *const ReferenceeDef = Referencee->getDefinition();
46  if (ReferenceeDef != nullptr &&
47  Result.SourceManager->isBeforeInTranslationUnit(
48  ReferenceeDef->getLocation(), Var->getLocation())) {
49  return;
50  }
51  diag(Var->getLocation(),
52  "initializing non-local variable with non-const expression depending on "
53  "uninitialized non-local variable %0")
54  << Referencee;
55 }
56 
57 } // namespace cppcoreguidelines
58 } // namespace tidy
59 } // namespace clang
InterfacesGlobalInitCheck.h
clang::ast_matchers
Definition: AbseilMatcher.h:14
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ApplyReplacements.h:27
clang::clangd::check
bool check(llvm::StringRef File, const ThreadsafeFS &TFS, const ClangdLSPServer::Options &Opts)
Definition: Check.cpp:418