[clangd] Store source file hash in IndexFile{In,Out}

Summary:
Puts the digest of the source file that generated the index into
serialized index and stores them back on load, if exists.

Reviewers: sammccall

Subscribers: ilya-biryukov, ioeric, MaskRay, jkorous, arphaman, cfe-commits

Differential Revision: https://reviews.llvm.org/D54693

llvm-svn: 347235

1 files changed, 5 insertions, 2 deletions

diff --git a/clang-tools-extra/unittests/clangd/BackgroundIndexTests.cpp b/clang-tools-extra/unittests/clangd/BackgroundIndexTests.cpp
index 6746e800ea1..39f4040f09d 100644
--- a/clang-tools-extra/unittests/clangd/BackgroundIndexTests.cpp
+++ b/clang-tools-extra/unittests/clangd/BackgroundIndexTests.cpp
@@ -121,8 +121,10 @@ TEST(BackgroundIndexTest, ShardStorageWriteTest) {
       void f_b();
       class A_CC {};
       )cpp";
-  FS.Files[testPath("root/A.cc")] =
-      "#include \"A.h\"\nvoid g() { (void)common; }";
+  std::string A_CC = "#include \"A.h\"\nvoid g() { (void)common; }";
+  FS.Files[testPath("root/A.cc")] = A_CC;
+  auto Digest = llvm::SHA1::hash(
+      {reinterpret_cast<const uint8_t *>(A_CC.data()), A_CC.size()});
 
   llvm::StringMap<std::string> Storage;
   size_t CacheHits = 0;
@@ -156,6 +158,7 @@ TEST(BackgroundIndexTest, ShardStorageWriteTest) {
   EXPECT_NE(ShardSource, nullptr);
   EXPECT_THAT(*ShardSource->Symbols, UnorderedElementsAre());
   EXPECT_THAT(*ShardSource->Refs, RefsAre({FileURI("unittest:///root/A.cc")}));
+  EXPECT_EQ(*ShardSource->Digest, Digest);
 }
 
 } // namespace clangd