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//===--- Symbol.cpp ----------------------------------------------*- 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
//
//===----------------------------------------------------------------------===//
#include "Symbol.h"
namespace clang {
namespace clangd {
llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, Symbol::SymbolFlag F) {
if (F == Symbol::None)
return OS << "None";
std::string S;
if (F & Symbol::Deprecated)
S += "deprecated|";
if (F & Symbol::IndexedForCodeCompletion)
S += "completion|";
return OS << llvm::StringRef(S).rtrim('|');
}
llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, const Symbol &S) {
return OS << S.Scope << S.Name;
}
float quality(const Symbol &S) {
// This avoids a sharp gradient for tail symbols, and also neatly avoids the
// question of whether 0 references means a bad symbol or missing data.
if (S.References < 3)
return 1;
return std::log(S.References);
}
SymbolSlab::const_iterator SymbolSlab::find(const SymbolID &ID) const {
auto It = llvm::partition_point(Symbols,
[&](const Symbol &S) { return S.ID < ID; });
if (It != Symbols.end() && It->ID == ID)
return It;
return Symbols.end();
}
// Copy the underlying data of the symbol into the owned arena.
static void own(Symbol &S, llvm::UniqueStringSaver &Strings) {
visitStrings(S, [&](llvm::StringRef &V) { V = Strings.save(V); });
}
void SymbolSlab::Builder::insert(const Symbol &S) {
own(Symbols[S.ID] = S, UniqueStrings);
}
SymbolSlab SymbolSlab::Builder::build() && {
// Sort symbols into vector so the slab can binary search over them.
std::vector<Symbol> SortedSymbols;
SortedSymbols.reserve(Symbols.size());
for (auto &Entry : Symbols)
SortedSymbols.push_back(std::move(Entry.second));
llvm::sort(SortedSymbols,
[](const Symbol &L, const Symbol &R) { return L.ID < R.ID; });
// We may have unused strings from overwritten symbols. Build a new arena.
llvm::BumpPtrAllocator NewArena;
llvm::UniqueStringSaver Strings(NewArena);
for (auto &S : SortedSymbols)
own(S, Strings);
return SymbolSlab(std::move(NewArena), std::move(SortedSymbols));
}
} // namespace clangd
} // namespace clang
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