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//===--- Relation.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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_RELATION_H
#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_RELATION_H
#include "SymbolID.h"
#include "SymbolLocation.h"
#include "clang/Index/IndexSymbol.h"
#include "llvm/ADT/iterator_range.h"
#include <cstdint>
#include <utility>
namespace clang {
namespace clangd {
/// Represents a relation between two symbols.
/// For an example "A is a base class of B" may be represented
/// as { Subject = A, Predicate = RelationBaseOf, Object = B }.
struct Relation {
SymbolID Subject;
index::SymbolRole Predicate;
SymbolID Object;
bool operator==(const Relation &Other) const {
return std::tie(Subject, Predicate, Object) ==
std::tie(Other.Subject, Other.Predicate, Other.Object);
}
// SPO order
bool operator<(const Relation &Other) const {
return std::tie(Subject, Predicate, Object) <
std::tie(Other.Subject, Other.Predicate, Other.Object);
}
};
class RelationSlab {
public:
using value_type = Relation;
using const_iterator = std::vector<value_type>::const_iterator;
using iterator = const_iterator;
RelationSlab() = default;
RelationSlab(RelationSlab &&Slab) = default;
RelationSlab &operator=(RelationSlab &&RHS) = default;
const_iterator begin() const { return Relations.begin(); }
const_iterator end() const { return Relations.end(); }
size_t size() const { return Relations.size(); }
bool empty() const { return Relations.empty(); }
size_t bytes() const {
return sizeof(*this) + sizeof(value_type) * Relations.capacity();
}
/// Lookup all relations matching the given subject and predicate.
llvm::iterator_range<iterator> lookup(const SymbolID &Subject,
index::SymbolRole Predicate) const;
/// RelationSlab::Builder is a mutable container that can 'freeze' to
/// RelationSlab.
class Builder {
public:
/// Adds a relation to the slab.
void insert(const Relation &R) { Relations.push_back(R); }
/// Consumes the builder to finalize the slab.
RelationSlab build() &&;
private:
std::vector<Relation> Relations;
};
private:
RelationSlab(std::vector<Relation> Relations)
: Relations(std::move(Relations)) {}
std::vector<Relation> Relations;
};
} // namespace clangd
} // namespace clang
namespace llvm {
// Support index::SymbolRole as a DenseMap key for the purpose of looking up
// relations.
template <> struct DenseMapInfo<clang::index::SymbolRole> {
static inline clang::index::SymbolRole getEmptyKey() {
// Choose an enumerator that's not a relation.
return clang::index::SymbolRole::Declaration;
}
static inline clang::index::SymbolRole getTombstoneKey() {
// Choose another enumerator that's not a relation.
return clang::index::SymbolRole::Definition;
}
static unsigned getHashValue(const clang::index::SymbolRole &Key) {
return hash_value(Key);
}
static bool isEqual(const clang::index::SymbolRole &LHS,
const clang::index::SymbolRole &RHS) {
return LHS == RHS;
}
};
} // namespace llvm
#endif // LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_RELATION_H
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