clang-tools 10.0.0

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
9 #include "PreferRegisterOverUnsignedCheck.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 llvm_check {
18
19 void PreferRegisterOverUnsignedCheck::registerMatchers(MatchFinder *Finder) {
20 auto RegisterClassMatch = hasType(
21 cxxRecordDecl(hasName("::llvm::Register")).bind("registerClassDecl"));
22
23 Finder->addMatcher(
24 valueDecl(allOf(
25 hasType(qualType(isUnsignedInteger()).bind("varType")),
26 varDecl(hasInitializer(exprWithCleanups(has(implicitCastExpr(has(
27 cxxMemberCallExpr(allOf(on(RegisterClassMatch),
28 has(memberExpr(hasDeclaration(
29 cxxConversionDecl())))))))))))
30 .bind("var"))),
31 this);
32 }
33
34 void PreferRegisterOverUnsignedCheck::check(
35 const MatchFinder::MatchResult &Result) {
36 const auto *VarType = Result.Nodes.getNodeAs<QualType>("varType");
37 const auto *UserVarDecl = Result.Nodes.getNodeAs<VarDecl>("var");
38
39 StringRef Replacement = "llvm::Register";
40 const DeclContext *Context = UserVarDecl->getDeclContext();
41 while (Context) {
42 if (const auto *Namespace = dyn_cast<NamespaceDecl>(Context))
43 if (isa<TranslationUnitDecl>(Namespace->getDeclContext()) &&
44 Namespace->getName() == "llvm")
45 Replacement = "Register";
46 for (const auto *UsingDirective : Context->using_directives()) {
47 const NamespaceDecl *Namespace = UsingDirective->getNominatedNamespace();
48 if (isa<TranslationUnitDecl>(Namespace->getDeclContext()) &&
49 Namespace->getName() == "llvm")
50 Replacement = "Register";
51 }
52 Context = Context->getParent();
53 }
54 diag(UserVarDecl->getLocation(),
55 "variable %0 declared as %1; use '%2' instead")
56 << UserVarDecl << *VarType << Replacement
57 << FixItHint::CreateReplacement(
58 UserVarDecl->getTypeSourceInfo()->getTypeLoc().getSourceRange(),
59 Replacement);
60 }
61
62 } // namespace llvm_check
63 } // namespace tidy
64 } // namespace clang
clang::ast_matchers
Definition: AbseilMatcher.h:14
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ApplyReplacements.h:27
PreferRegisterOverUnsignedCheck.h