[clangd] Set Incompleteness for spec fuzzyfind requests

Differential Revision: https://reviews.llvm.org/D133479

clang-tools-extra/clangd/CodeComplete.cpp

@@ -70,6 +70,7 @@
 #include <algorithm>
 #include <iterator>
 #include <limits>
+#include <utility>
 
 // We log detailed candidate here if you run with -debug-only=codecomplete.
 #define DEBUG_TYPE "CodeComplete"
@@ -1363,13 +1364,14 @@ bool includeSymbolFromIndex(CodeCompletionContext::Kind Kind,
   return true;
 }
 
-std::future<SymbolSlab> startAsyncFuzzyFind(const SymbolIndex &Index,
-                                            const FuzzyFindRequest &Req) {
-  return runAsync<SymbolSlab>([&Index, Req]() {
+std::future<std::pair<bool, SymbolSlab>>
+startAsyncFuzzyFind(const SymbolIndex &Index, const FuzzyFindRequest &Req) {
+  return runAsync<std::pair<bool, SymbolSlab>>([&Index, Req]() {
     trace::Span Tracer("Async fuzzyFind");
     SymbolSlab::Builder Syms;
-    Index.fuzzyFind(Req, [&Syms](const Symbol &Sym) { Syms.insert(Sym); });
-    return std::move(Syms).build();
+    bool Incomplete =
+        Index.fuzzyFind(Req, [&Syms](const Symbol &Sym) { Syms.insert(Sym); });
+    return std::make_pair(Incomplete, std::move(Syms).build());
   });
 }
 
@@ -1721,7 +1723,9 @@ private:
       SPAN_ATTACH(Tracer, "Speculative results", true);
 
       trace::Span WaitSpec("Wait speculative results");
-      return SpecFuzzyFind->Result.get();
+      auto SpecRes = SpecFuzzyFind->Result.get();
+      Incomplete |= SpecRes.first;
+      return std::move(SpecRes.second);
     }
 
     SPAN_ATTACH(Tracer, "Speculative results", false);

clang-tools-extra/clangd/CodeComplete.h

@@ -31,6 +31,7 @@
 #include "llvm/ADT/StringRef.h"
 #include <functional>
 #include <future>
+#include <utility>
 
 namespace clang {
 class NamedDecl;
@@ -262,7 +263,7 @@ struct SpeculativeFuzzyFind {
   llvm::Optional<FuzzyFindRequest> NewReq;
   /// The result is consumed by `codeComplete()` if speculation succeeded.
   /// NOTE: the destructor will wait for the async call to finish.
-  std::future<SymbolSlab> Result;
+  std::future<std::pair<bool /*Incomplete*/, SymbolSlab>> Result;
 };
 
 /// Gets code completions at a specified \p Pos in \p FileName.

clang-tools-extra/clangd/unittests/CodeCompleteTests.cpp

@@ -2594,7 +2594,8 @@ TEST(CompletionTest, EnableSpeculativeIndexRequest) {
   Opts.Index = &Requests;
 
   auto CompleteAtPoint = [&](StringRef P) {
-    cantFail(runCodeComplete(Server, File, Test.point(P), Opts));
+    auto CCR = cantFail(runCodeComplete(Server, File, Test.point(P), Opts));
+    EXPECT_TRUE(CCR.HasMore);
   };
 
   CompleteAtPoint("1");