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//===--- Matchers.h - 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_UTILS_MATCHERS_H
#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_UTILS_MATCHERS_H
#include "TypeTraits.h"
#include "clang/AST/ExprConcepts.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include <optional>
namespace clang::tidy::matchers {
AST_MATCHER(BinaryOperator, isRelationalOperator) {
return Node.isRelationalOp();
}
AST_MATCHER(BinaryOperator, isEqualityOperator) { return Node.isEqualityOp(); }
AST_MATCHER(QualType, isExpensiveToCopy) {
std::optional<bool> IsExpensive =
utils::type_traits::isExpensiveToCopy(Node, Finder->getASTContext());
return IsExpensive && *IsExpensive;
}
AST_MATCHER(RecordDecl, isTriviallyDefaultConstructible) {
return utils::type_traits::recordIsTriviallyDefaultConstructible(
Node, Finder->getASTContext());
}
AST_MATCHER(QualType, isTriviallyDestructible) {
return utils::type_traits::isTriviallyDestructible(Node);
}
// Returns QualType matcher for references to const.
AST_MATCHER_FUNCTION(ast_matchers::TypeMatcher, isReferenceToConst) {
using namespace ast_matchers;
return referenceType(pointee(qualType(isConstQualified())));
}
// Returns QualType matcher for pointers to const.
AST_MATCHER_FUNCTION(ast_matchers::TypeMatcher, isPointerToConst) {
using namespace ast_matchers;
return pointerType(pointee(qualType(isConstQualified())));
}
// Returns QualType matcher for target char type only.
AST_MATCHER(QualType, isSimpleChar) {
const auto ActualType = Node.getTypePtr();
return ActualType &&
(ActualType->isSpecificBuiltinType(BuiltinType::Char_S) ||
ActualType->isSpecificBuiltinType(BuiltinType::Char_U));
}
AST_MATCHER(Expr, hasUnevaluatedContext) {
if (isa<CXXNoexceptExpr>(Node) || isa<RequiresExpr>(Node))
return true;
if (const auto *UnaryExpr = dyn_cast<UnaryExprOrTypeTraitExpr>(&Node)) {
switch (UnaryExpr->getKind()) {
case UETT_SizeOf:
case UETT_AlignOf:
return true;
default:
return false;
}
}
if (const auto *TypeIDExpr = dyn_cast<CXXTypeidExpr>(&Node))
return !TypeIDExpr->isPotentiallyEvaluated();
return false;
}
// A matcher implementation that matches a list of type name regular expressions
// against a NamedDecl. If a regular expression contains the substring "::"
// matching will occur against the qualified name, otherwise only the typename.
class MatchesAnyListedNameMatcher
: public ast_matchers::internal::MatcherInterface<NamedDecl> {
public:
explicit MatchesAnyListedNameMatcher(llvm::ArrayRef<StringRef> NameList) {
std::transform(
NameList.begin(), NameList.end(), std::back_inserter(NameMatchers),
[](const llvm::StringRef Name) { return NameMatcher(Name); });
}
class NameMatcher {
llvm::Regex Regex;
enum class MatchMode {
// Match against the unqualified name because the regular expression
// does not contain ":".
MatchUnqualified,
// Match against the qualified name because the regular expression
// contains ":" suggesting name and namespace should be matched.
MatchQualified,
// Match against the fully qualified name because the regular expression
// starts with ":".
MatchFullyQualified,
};
MatchMode Mode;
public:
NameMatcher(const llvm::StringRef Regex)
: Regex(Regex), Mode(determineMatchMode(Regex)) {}
bool match(const NamedDecl &ND) const {
switch (Mode) {
case MatchMode::MatchQualified:
return Regex.match(ND.getQualifiedNameAsString());
case MatchMode::MatchFullyQualified:
return Regex.match("::" + ND.getQualifiedNameAsString());
default:
if (const IdentifierInfo *II = ND.getIdentifier())
return Regex.match(II->getName());
return false;
}
}
private:
MatchMode determineMatchMode(llvm::StringRef Regex) {
if (Regex.starts_with(":") || Regex.starts_with("^:")) {
return MatchMode::MatchFullyQualified;
}
return Regex.contains(":") ? MatchMode::MatchQualified
: MatchMode::MatchUnqualified;
}
};
bool matches(
const NamedDecl &Node, ast_matchers::internal::ASTMatchFinder *Finder,
ast_matchers::internal::BoundNodesTreeBuilder *Builder) const override {
return llvm::any_of(NameMatchers, [&Node](const NameMatcher &NM) {
return NM.match(Node);
});
}
private:
std::vector<NameMatcher> NameMatchers;
};
// Returns a matcher that matches NamedDecl's against a list of provided regular
// expressions. If a regular expression contains starts ':' the NamedDecl's
// qualified name will be used for matching, otherwise its name will be used.
inline ::clang::ast_matchers::internal::Matcher<NamedDecl>
matchesAnyListedName(llvm::ArrayRef<StringRef> NameList) {
return ::clang::ast_matchers::internal::makeMatcher(
new MatchesAnyListedNameMatcher(NameList));
}
// Predicate that verify if statement is not identical to one bound to ID node.
struct NotIdenticalStatementsPredicate {
bool
operator()(const clang::ast_matchers::internal::BoundNodesMap &Nodes) const;
std::string ID;
::clang::DynTypedNode Node;
ASTContext *Context;
};
// Checks if statement is identical (utils::areStatementsIdentical) to one bound
// to ID node.
AST_MATCHER_P(Stmt, isStatementIdenticalToBoundNode, std::string, ID) {
NotIdenticalStatementsPredicate Predicate{
ID, ::clang::DynTypedNode::create(Node), &(Finder->getASTContext())};
return Builder->removeBindings(Predicate);
}
// A matcher implementation that matches a list of type name regular expressions
// against a QualType.
class MatchesAnyListedTypeNameMatcher
: public ast_matchers::internal::MatcherInterface<QualType> {
public:
explicit MatchesAnyListedTypeNameMatcher(llvm::ArrayRef<StringRef> NameList);
~MatchesAnyListedTypeNameMatcher() override;
bool matches(
const QualType &Node, ast_matchers::internal::ASTMatchFinder *Finder,
ast_matchers::internal::BoundNodesTreeBuilder *Builder) const override;
private:
std::vector<llvm::Regex> NameMatchers;
};
// Returns a matcher that matches QualType against a list of provided regular.
inline ::clang::ast_matchers::internal::Matcher<QualType>
matchesAnyListedTypeName(llvm::ArrayRef<StringRef> NameList) {
return ::clang::ast_matchers::internal::makeMatcher(
new MatchesAnyListedTypeNameMatcher(NameList));
}
} // namespace clang::tidy::matchers
#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_UTILS_MATCHERS_H
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