PreferRegisterOverUnsignedCheck.cpp
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//===--- PreferRegisterOverUnsignedCheck.cpp - clang-tidy -----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "PreferRegisterOverUnsignedCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace llvm_check {
void PreferRegisterOverUnsignedCheck::registerMatchers(MatchFinder *Finder) {
auto RegisterClassMatch = hasType(
cxxRecordDecl(hasName("::llvm::Register")).bind("registerClassDecl"));
Finder->addMatcher(
valueDecl(allOf(
hasType(qualType(isUnsignedInteger()).bind("varType")),
varDecl(hasInitializer(exprWithCleanups(has(implicitCastExpr(has(
cxxMemberCallExpr(allOf(on(RegisterClassMatch),
has(memberExpr(hasDeclaration(
cxxConversionDecl())))))))))))
.bind("var"))),
this);
}
void PreferRegisterOverUnsignedCheck::check(
const MatchFinder::MatchResult &Result) {
const auto *VarType = Result.Nodes.getNodeAs<QualType>("varType");
const auto *UserVarDecl = Result.Nodes.getNodeAs<VarDecl>("var");
StringRef Replacement = "llvm::Register";
const DeclContext *Context = UserVarDecl->getDeclContext();
while (Context) {
if (const auto *Namespace = dyn_cast<NamespaceDecl>(Context))
if (isa<TranslationUnitDecl>(Namespace->getDeclContext()) &&
Namespace->getName() == "llvm")
Replacement = "Register";
for (const auto *UsingDirective : Context->using_directives()) {
const NamespaceDecl *Namespace = UsingDirective->getNominatedNamespace();
if (isa<TranslationUnitDecl>(Namespace->getDeclContext()) &&
Namespace->getName() == "llvm")
Replacement = "Register";
}
Context = Context->getParent();
}
diag(UserVarDecl->getLocation(),
"variable %0 declared as %1; use '%2' instead")
<< UserVarDecl << *VarType << Replacement
<< FixItHint::CreateReplacement(
UserVarDecl->getTypeSourceInfo()->getTypeLoc().getSourceRange(),
Replacement);
}
} // namespace llvm_check
} // namespace tidy
} // namespace clang