86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
//===--- Index.cpp -----------------------------------------------*- C++-*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "Index.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/SHA1.h"
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namespace clang {
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namespace clangd {
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using namespace llvm;
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SymbolID::SymbolID(StringRef USR)
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: HashValue(SHA1::hash(arrayRefFromStringRef(USR))) {}
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raw_ostream &operator<<(raw_ostream &OS, const SymbolID &ID) {
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OS << toHex(toStringRef(ID.HashValue));
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return OS;
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}
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void operator>>(StringRef Str, SymbolID &ID) {
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std::string HexString = fromHex(Str);
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assert(HexString.size() == ID.HashValue.size());
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std::copy(HexString.begin(), HexString.end(), ID.HashValue.begin());
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}
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SymbolSlab::const_iterator SymbolSlab::find(const SymbolID &ID) const {
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auto It = std::lower_bound(Symbols.begin(), Symbols.end(), ID,
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[](const Symbol &S, const SymbolID &I) {
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return S.ID < I;
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});
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if (It != Symbols.end() && It->ID == ID)
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return It;
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return Symbols.end();
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}
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// Copy the underlying data of the symbol into the owned arena.
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static void own(Symbol &S, DenseSet<StringRef> &Strings,
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BumpPtrAllocator &Arena) {
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// Intern replaces V with a reference to the same string owned by the arena.
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auto Intern = [&](StringRef &V) {
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auto R = Strings.insert(V);
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if (R.second) { // New entry added to the table, copy the string.
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*R.first = V.copy(Arena);
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}
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V = *R.first;
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};
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// We need to copy every StringRef field onto the arena.
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Intern(S.Name);
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Intern(S.Scope);
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Intern(S.CanonicalDeclaration.FilePath);
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}
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void SymbolSlab::Builder::insert(const Symbol &S) {
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auto R = SymbolIndex.try_emplace(S.ID, Symbols.size());
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if (R.second) {
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Symbols.push_back(S);
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own(Symbols.back(), Strings, Arena);
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} else {
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auto &Copy = Symbols[R.first->second] = S;
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own(Copy, Strings, Arena);
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}
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}
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SymbolSlab SymbolSlab::Builder::build() && {
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Symbols = {Symbols.begin(), Symbols.end()}; // Force shrink-to-fit.
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// Sort symbols so the slab can binary search over them.
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std::sort(Symbols.begin(), Symbols.end(),
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[](const Symbol &L, const Symbol &R) { return L.ID < R.ID; });
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// We may have unused strings from overwritten symbols. Build a new arena.
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BumpPtrAllocator NewArena;
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DenseSet<StringRef> Strings;
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for (auto &S : Symbols)
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own(S, Strings, NewArena);
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return SymbolSlab(std::move(NewArena), std::move(Symbols));
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}
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} // namespace clangd
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} // namespace clang
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