Reland "[clang][SourceManager] cache Macro Expansions""

This reverts commit 33d63f02ce408d181e13089ee5a667fb2e1cdc78.

Differential Revision: https://reviews.llvm.org/D80681

1 files changed, 6 insertions, 14 deletions

diff --git a/clang/lib/Basic/SourceManager.cpp b/clang/lib/Basic/SourceManager.cpp
index 425bef7..0a76c78 100644
--- a/clang/lib/Basic/SourceManager.cpp
+++ b/clang/lib/Basic/SourceManager.cpp
@@ -861,11 +861,8 @@ FileID SourceManager::getFileIDLocal(unsigned SLocOffset) const {
     --I;
     if (I->getOffset() <= SLocOffset) {
       FileID Res = FileID::get(int(I - LocalSLocEntryTable.begin()));
-
-      // If this isn't an expansion, remember it.  We have good locality across
-      // FileID lookups.
-      if (!I->isExpansion())
-        LastFileIDLookup = Res;
+      // Remember it.  We have good locality across FileID lookups.
+      LastFileIDLookup = Res;
       NumLinearScans += NumProbes+1;
       return Res;
     }
@@ -899,10 +896,8 @@ FileID SourceManager::getFileIDLocal(unsigned SLocOffset) const {
         SLocOffset < getLocalSLocEntry(MiddleIndex + 1).getOffset()) {
       FileID Res = FileID::get(MiddleIndex);
 
-      // If this isn't a macro expansion, remember it.  We have good locality
-      // across FileID lookups.
-      if (!LocalSLocEntryTable[MiddleIndex].isExpansion())
-        LastFileIDLookup = Res;
+      // Remember it.  We have good locality across FileID lookups.
+      LastFileIDLookup = Res;
       NumBinaryProbes += NumProbes;
       return Res;
     }
@@ -940,9 +935,7 @@ FileID SourceManager::getFileIDLoaded(unsigned SLocOffset) const {
     const SrcMgr::SLocEntry &E = getLoadedSLocEntry(I);
     if (E.getOffset() <= SLocOffset) {
       FileID Res = FileID::get(-int(I) - 2);
-
-      if (!E.isExpansion())
-        LastFileIDLookup = Res;
+      LastFileIDLookup = Res;
       NumLinearScans += NumProbes + 1;
       return Res;
     }
@@ -975,8 +968,7 @@ FileID SourceManager::getFileIDLoaded(unsigned SLocOffset) const {
 
     if (isOffsetInFileID(FileID::get(-int(MiddleIndex) - 2), SLocOffset)) {
       FileID Res = FileID::get(-int(MiddleIndex) - 2);
-      if (!E.isExpansion())
-        LastFileIDLookup = Res;
+      LastFileIDLookup = Res;
       NumBinaryProbes += NumProbes;
       return Res;
     }