Add index.multiVersion{Black,White}list

They allow files matching specified patterns to be indexed only once
even if index.multiVersion > 0. An example is to exclude system headers
with index.multiVersionBlacklist: ["^/usr/include"]

src/config.h

@@ -179,6 +179,11 @@ struct Config {
     // If not 0, a file will be indexed in each tranlation unit that includes it.
     int multiVersion = 0;
 
+    // If multiVersion != 0, files that match blacklist but not whitelist will
+    // still only be indexed for one version.
+    std::vector<std::string> multiVersionBlacklist;
+    std::vector<std::string> multiVersionWhitelist;
+
     // Allow indexing on textDocument/didChange.
     // May be too slow for big projects, so it is off by default.
     bool onDidChange = false;
@@ -225,7 +230,8 @@ MAKE_REFLECT_STRUCT(Config::Diagnostics, blacklist, frequencyMs, onOpen,
                     onType, whitelist)
 MAKE_REFLECT_STRUCT(Config::Highlight, lsRanges, blacklist, whitelist)
 MAKE_REFLECT_STRUCT(Config::Index, blacklist, comments, enabled, multiVersion,
-                    onDidChange, reparseForDependency, threads, whitelist);
+                    multiVersionBlacklist, multiVersionWhitelist, onDidChange,
+                    reparseForDependency, threads, whitelist);
 MAKE_REFLECT_STRUCT(Config::WorkspaceSymbol, caseSensitivity, maxNum, sort);
 MAKE_REFLECT_STRUCT(Config::Xref, container, maxNum);
 MAKE_REFLECT_STRUCT(Config, compilationDatabaseCommand,

src/indexer.cc

@@ -5,6 +5,7 @@
 
 #include "clang_tu.h"
 #include "log.hh"
+#include "match.h"
 #include "platform.h"
 #include "serializer.h"
 using ccls::Intern;
@@ -32,8 +33,11 @@ namespace {
 
 constexpr int kInitializerMaxLines = 3;
 
+GroupMatch *multiVersionMatcher;
+
 struct IndexParam {
   std::unordered_map<llvm::sys::fs::UniqueID, std::string> SeenUniqueID;
+  std::unordered_map<llvm::sys::fs::UniqueID, bool> UID2multi;
   std::unordered_map<std::string, FileContents> file_contents;
   std::unordered_map<std::string, int64_t> file2write_time;
   struct DeclInfo {
@@ -69,6 +73,13 @@ struct IndexParam {
     SeenFile(FE);
     return file_consumer->TryConsumeFile(FE, &file_contents);
   }
+
+  bool UseMultiVersion(const FileEntry &FE) {
+    auto it = UID2multi.try_emplace(FE.getUniqueID());
+    if (it.second)
+      it.first->second = multiVersionMatcher->IsMatch(FileName(FE));
+    return it.first->second;
+  }
 };
 
 StringRef GetSourceInRange(const SourceManager &SM, const LangOptions &LangOpts,
@@ -624,7 +635,7 @@ public:
       return true;
     int lid = -1;
     IndexFile *db;
-    if (g_config->index.multiVersion) {
+    if (g_config->index.multiVersion && param.UseMultiVersion(*FE)) {
       db = param.ConsumeFile(*SM.getFileEntryForID(SM.getMainFileID()));
       if (!db)
         return true;
@@ -1165,6 +1176,11 @@ template <typename T> void Uniquify(std::vector<T> &a) {
 }
 
 namespace ccls::idx {
+void Init() {
+  multiVersionMatcher = new GroupMatch(g_config->index.multiVersionWhitelist,
+                                       g_config->index.multiVersionBlacklist);
+}
+
 std::vector<std::unique_ptr<IndexFile>>
 Index(VFS *vfs, const std::string &opt_wdir, const std::string &file,
       const std::vector<std::string> &args,

src/indexer.h

@@ -265,6 +265,7 @@ struct IndexFile {
 };
 
 namespace ccls::idx {
+void Init();
 std::vector<std::unique_ptr<IndexFile>>
 Index(VFS *vfs, const std::string &opt_wdir, const std::string &file,
       const std::vector<std::string> &args,

src/messages/initialize.cc

@@ -466,6 +466,7 @@ struct Handler_Initialize : BaseMessageHandler<In_InitializeRequest> {
                                 EscapeFileName(g_config->projectRoot));
 
     diag_pub->Init();
+    idx::Init();
     semantic_cache->Init();
 
     // Open up / load the project.