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//===- CXXPredicates.h ------------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
/// \file Contains utilities related to handling C++ code in MIR patterns for
/// GlobalISel. C++ predicates need to be expanded, and then stored in a
/// static pool until they can be emitted.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_UTILS_MIRPATTERNS_CXXPREDICATES_H
#define LLVM_UTILS_MIRPATTERNS_CXXPREDICATES_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/Hashing.h"
#include "llvm/ADT/StringRef.h"
#include <memory>
#include <string>
#include <vector>
namespace llvm {
namespace gi {
/// Entry into the static pool of all CXX Predicate code. This contains
/// fully expanded C++ code.
///
/// The static pool is hidden inside the object and can be accessed through
/// getAllMatchCode/getAllApplyCode
///
/// Note that CXXPattern trims C++ code, so the Code is already expected to be
/// free of leading/trailing whitespace.
class CXXPredicateCode {
using CXXPredicateCodePool =
DenseMap<hash_code, std::unique_ptr<CXXPredicateCode>>;
static CXXPredicateCodePool AllCXXMatchCode;
static CXXPredicateCodePool AllCXXCustomActionCode;
/// Sorts a `CXXPredicateCodePool` by their IDs and returns it.
static std::vector<const CXXPredicateCode *>
getSorted(const CXXPredicateCodePool &Pool);
/// Gets an instance of `CXXPredicateCode` for \p Code, or returns an already
/// existing one.
static const CXXPredicateCode &get(CXXPredicateCodePool &Pool,
std::string Code);
CXXPredicateCode(std::string Code, unsigned ID);
public:
static const CXXPredicateCode &getMatchCode(std::string Code) {
return get(AllCXXMatchCode, std::move(Code));
}
static const CXXPredicateCode &getCustomActionCode(std::string Code) {
return get(AllCXXCustomActionCode, std::move(Code));
}
static std::vector<const CXXPredicateCode *> getAllMatchCode() {
return getSorted(AllCXXMatchCode);
}
static std::vector<const CXXPredicateCode *> getAllCustomActionsCode() {
return getSorted(AllCXXCustomActionCode);
}
const std::string Code;
const unsigned ID;
const std::string BaseEnumName;
bool needsUnreachable() const {
return !StringRef(Code).starts_with("return");
}
std::string getEnumNameWithPrefix(StringRef Prefix) const {
return Prefix.str() + BaseEnumName;
}
};
} // namespace gi
} // end namespace llvm
#endif // ifndef LLVM_UTILS_MIRPATTERNS_CXXPREDICATES_H
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