Optimize unqualified/global name lookup in modules by introducing a
generational scheme for identifiers that avoids searching the hash
tables of a given module more than once for a given
identifier. Previously, loading any new module invalidated all of the
previous lookup results for all identifiers, causing us to perform the
lookups repeatedly.
llvm-svn: 148412
diff --git a/clang/lib/Serialization/ModuleManager.cpp b/clang/lib/Serialization/ModuleManager.cpp
index 4470855..ab364b7 100644
--- a/clang/lib/Serialization/ModuleManager.cpp
+++ b/clang/lib/Serialization/ModuleManager.cpp
@@ -35,7 +35,8 @@
std::pair<ModuleFile *, bool>
ModuleManager::addModule(StringRef FileName, ModuleKind Type,
- ModuleFile *ImportedBy, std::string &ErrorStr) {
+ ModuleFile *ImportedBy, unsigned Generation,
+ std::string &ErrorStr) {
const FileEntry *Entry = FileMgr.getFile(FileName);
if (!Entry && FileName != "-") {
ErrorStr = "file not found";
@@ -47,7 +48,7 @@
bool NewModule = false;
if (!ModuleEntry) {
// Allocate a new module.
- ModuleFile *New = new ModuleFile(Type);
+ ModuleFile *New = new ModuleFile(Type, Generation);
New->FileName = FileName.str();
Chain.push_back(New);
NewModule = true;