clang-tools 19.0.0git
PreferRegisterOverUnsignedCheck.cpp
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1//===--- PreferRegisterOverUnsignedCheck.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
13using namespace clang::ast_matchers;
14
16
18 auto RegisterClassMatch = hasType(
19 cxxRecordDecl(hasName("::llvm::Register")).bind("registerClassDecl"));
20
21 Finder->addMatcher(
22 traverse(TK_AsIs,
23 valueDecl(hasType(qualType(isUnsignedInteger()).bind("varType")),
24 varDecl(hasInitializer(exprWithCleanups(
25 has(implicitCastExpr(has(cxxMemberCallExpr(
26 on(RegisterClassMatch),
27 has(memberExpr(hasDeclaration(
28 cxxConversionDecl()))))))))))
29 .bind("var"))),
30 this);
31}
32
34 const MatchFinder::MatchResult &Result) {
35 const auto *VarType = Result.Nodes.getNodeAs<QualType>("varType");
36 const auto *UserVarDecl = Result.Nodes.getNodeAs<VarDecl>("var");
37
38 bool NeedsQualification = true;
39 const DeclContext *Context = UserVarDecl->getDeclContext();
40 while (Context) {
41 if (const auto *Namespace = dyn_cast<NamespaceDecl>(Context))
42 if (isa<TranslationUnitDecl>(Namespace->getDeclContext()) &&
43 Namespace->getName() == "llvm")
44 NeedsQualification = false;
45 for (const auto *UsingDirective : Context->using_directives()) {
46 const NamespaceDecl *Namespace = UsingDirective->getNominatedNamespace();
47 if (isa<TranslationUnitDecl>(Namespace->getDeclContext()) &&
48 Namespace->getName() == "llvm")
49 NeedsQualification = false;
50 }
51 Context = Context->getParent();
52 }
53 diag(UserVarDecl->getLocation(),
54 "variable %0 declared as %1; use '%select{|llvm::}2Register' instead")
55 << UserVarDecl << *VarType << NeedsQualification
56 << FixItHint::CreateReplacement(
57 UserVarDecl->getTypeSourceInfo()->getTypeLoc().getSourceRange(),
58 NeedsQualification ? "llvm::Register" : "Register");
59}
60
61} // namespace clang::tidy::llvm_check
DiagnosticBuilder diag(SourceLocation Loc, StringRef Description, DiagnosticIDs::Level Level=DiagnosticIDs::Warning)
Add a diagnostic with the check's name.
void check(const ast_matchers::MatchFinder::MatchResult &Result) override
ClangTidyChecks that register ASTMatchers should do the actual work in here.
void registerMatchers(ast_matchers::MatchFinder *Finder) override
Override this to register AST matchers with Finder.