MemIndex.cpp
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//===--- MemIndex.cpp - Dynamic in-memory symbol index. ----------*- 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 "MemIndex.h"
#include "FuzzyMatch.h"
#include "Quality.h"
#include "support/Logger.h"
#include "support/Trace.h"
#include "clang/Index/IndexSymbol.h"
namespace clang {
namespace clangd {
std::unique_ptr<SymbolIndex> MemIndex::build(SymbolSlab Slab, RefSlab Refs,
RelationSlab Relations) {
// Store Slab size before it is moved.
const auto BackingDataSize = Slab.bytes() + Refs.bytes();
auto Data = std::make_pair(std::move(Slab), std::move(Refs));
return std::make_unique<MemIndex>(Data.first, Data.second, Relations,
std::move(Data), BackingDataSize);
}
bool MemIndex::fuzzyFind(
const FuzzyFindRequest &Req,
llvm::function_ref<void(const Symbol &)> Callback) const {
assert(!StringRef(Req.Query).contains("::") &&
"There must be no :: in query.");
trace::Span Tracer("MemIndex fuzzyFind");
TopN<std::pair<float, const Symbol *>> Top(
Req.Limit ? *Req.Limit : std::numeric_limits<size_t>::max());
FuzzyMatcher Filter(Req.Query);
bool More = false;
for (const auto &Pair : Index) {
const Symbol *Sym = Pair.second;
// Exact match against all possible scopes.
if (!Req.AnyScope && !llvm::is_contained(Req.Scopes, Sym->Scope))
continue;
if (Req.RestrictForCodeCompletion &&
!(Sym->Flags & Symbol::IndexedForCodeCompletion))
continue;
if (auto Score = Filter.match(Sym->Name))
if (Top.push({*Score * quality(*Sym), Sym}))
More = true; // An element with smallest score was discarded.
}
auto Results = std::move(Top).items();
SPAN_ATTACH(Tracer, "results", static_cast<int>(Results.size()));
for (const auto &Item : Results)
Callback(*Item.second);
return More;
}
void MemIndex::lookup(const LookupRequest &Req,
llvm::function_ref<void(const Symbol &)> Callback) const {
trace::Span Tracer("MemIndex lookup");
for (const auto &ID : Req.IDs) {
auto I = Index.find(ID);
if (I != Index.end())
Callback(*I->second);
}
}
bool MemIndex::refs(const RefsRequest &Req,
llvm::function_ref<void(const Ref &)> Callback) const {
trace::Span Tracer("MemIndex refs");
uint32_t Remaining =
Req.Limit.getValueOr(std::numeric_limits<uint32_t>::max());
for (const auto &ReqID : Req.IDs) {
auto SymRefs = Refs.find(ReqID);
if (SymRefs == Refs.end())
continue;
for (const auto &O : SymRefs->second) {
if (!static_cast<int>(Req.Filter & O.Kind))
continue;
if (Remaining == 0)
return true; // More refs were available.
--Remaining;
Callback(O);
}
}
return false; // We reported all refs.
}
void MemIndex::relations(
const RelationsRequest &Req,
llvm::function_ref<void(const SymbolID &, const Symbol &)> Callback) const {
uint32_t Remaining =
Req.Limit.getValueOr(std::numeric_limits<uint32_t>::max());
for (const SymbolID &Subject : Req.Subjects) {
LookupRequest LookupReq;
auto It = Relations.find(
std::make_pair(Subject, static_cast<uint8_t>(Req.Predicate)));
if (It != Relations.end()) {
for (const auto &Obj : It->second) {
if (Remaining > 0) {
--Remaining;
LookupReq.IDs.insert(Obj);
}
}
}
lookup(LookupReq, [&](const Symbol &Object) { Callback(Subject, Object); });
}
}
size_t MemIndex::estimateMemoryUsage() const {
return Index.getMemorySize() + Refs.getMemorySize() +
Relations.getMemorySize() + BackingDataSize;
}
} // namespace clangd
} // namespace clang