Cache FileID when translating diagnostics in PCH files

Modules/preambles/PCH files can contain diagnostics, which, when used,
are added to the current ASTUnit. For that to work, they are translated
to use the current FileManager's FileIDs. When the entry is not the
main file, all local source locations will be checked by a linear
search. Now this is a problem, when there are lots of diagnostics (say,
25000) and lots of local source locations (say, 440000), and end up
taking seconds when using such a preamble.

The fix is to cache the last FileID, because many subsequent diagnostics
refer to the same file. This reduces the time spent in
ASTUnit::TranslateStoredDiagnostics from seconds to a few milliseconds
for files with many slocs/diagnostics.

This fixes PR31353.
Differential Revision: https://reviews.llvm.org/D29755

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@295301 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Frontend/ASTUnit.cpp b/lib/Frontend/ASTUnit.cpp
index 12b78ea3cd9bb2df09b5af51d9232dbcb9099592..db19804d5fa99913409482db1e538f2ca99d8527 100644 (file)
--- a/lib/Frontend/ASTUnit.cpp
+++ b/lib/Frontend/ASTUnit.cpp
@@ -2541,6 +2541,8 @@ void ASTUnit::TranslateStoredDiagnostics(
 
   SmallVector<StoredDiagnostic, 4> Result;
   Result.reserve(Diags.size());
+  const FileEntry *PreviousFE = nullptr;
+  FileID FID;
   for (const StandaloneDiagnostic &SD : Diags) {
     // Rebuild the StoredDiagnostic.
     if (SD.Filename.empty())
@@ -2548,7 +2550,10 @@ void ASTUnit::TranslateStoredDiagnostics(
     const FileEntry *FE = FileMgr.getFile(SD.Filename);
     if (!FE)
       continue;
-    FileID FID = SrcMgr.translateFile(FE);
+    if (FE != PreviousFE) {
+      FID = SrcMgr.translateFile(FE);
+      PreviousFE = FE;
+    }
     SourceLocation FileLoc = SrcMgr.getLocForStartOfFile(FID);
     if (FileLoc.isInvalid())
       continue;