getModuleContainingLocation ends up on the hot-path for typical C code
which can lead to calls to getFileIDSlow.
To speed this up, short circuit inferModuleFromLocation when there
aren't any modules, implicit or otherwise.
This shaves 4-5% build time when building the linux kernel.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@269687
91177308-0d34-0410-b5e6-
96231b3b80d8
if (Loc.isInvalid())
return nullptr;
+ if (UmbrellaDirs.empty() && Headers.empty())
+ return nullptr;
+
// Use the expansion location to determine which module we're in.
FullSourceLoc ExpansionLoc = Loc.getExpansionLoc();
if (!ExpansionLoc.isFileID())