[PATCH] D29755: Cache FileID when translating diagnostics in PCH files

[Erik Verbruggen via Phabricator via cfe-commits]

erikjv created this revision.

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.


https://reviews.llvm.org/D29755

Files:
  lib/Frontend/ASTUnit.cpp


Index: lib/Frontend/ASTUnit.cpp
===================================================================
--- lib/Frontend/ASTUnit.cpp
+++ lib/Frontend/ASTUnit.cpp
@@ -2539,14 +2539,22 @@
 
   SmallVector<StoredDiagnostic, 4> Result;
   Result.reserve(Diags.size());
+  const FileEntry *CachedFE = nullptr;
+  FileID CachedFID;
   for (const StandaloneDiagnostic &SD : Diags) {
     // Rebuild the StoredDiagnostic.
     if (SD.Filename.empty())
       continue;
     const FileEntry *FE = FileMgr.getFile(SD.Filename);
     if (!FE)
       continue;
-    FileID FID = SrcMgr.translateFile(FE);
+    FileID FID;
+    if (FE == CachedFE) {
+      FID = CachedFID;
+    } else {
+      CachedFID = FID = SrcMgr.translateFile(FE);
+      CachedFE = FE;
+    }
     SourceLocation FileLoc = SrcMgr.getLocForStartOfFile(FID);
     if (FileLoc.isInvalid())
       continue;


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