[PCH] Keep track of file-level declarations that are contained by files.

Introduce a FILE_SORTED_DECLS [de]serialization record that contains
a file sorted array of file-level DeclIDs in a PCH/Module.
The rationale is to allow "targeted" deserialization of decls inside
a range of a source file.

Cocoa PCH increased by 0.8%
Difference of creation time for Cocoa PCH is below the noise level.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@143238 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/Serialization/ASTReader.cpp b/lib/Serialization/ASTReader.cpp
index 4678930702..8a1ae3da1a 100644
--- a/lib/Serialization/ASTReader.cpp
+++ b/lib/Serialization/ASTReader.cpp
@@ -1134,6 +1134,13 @@ ASTReader::ASTReadResult ASTReader::ReadSLocEntryRecord(int ID) {
     FileInfo.NumCreatedFIDs = Record[6];
     if (Record[3])
       FileInfo.setHasLineDirectives();
+
+    const DeclID *FirstDecl = F->FileSortedDecls + Record[7];
+    unsigned NumFileDecls = Record[8];
+    if (NumFileDecls) {
+      assert(F->FileSortedDecls && "FILE_SORTED_DECLS not encountered yet ?");
+      FileDeclIDs[FID] = llvm::makeArrayRef(FirstDecl, NumFileDecls);
+    }
     
     break;
   }
@@ -1960,6 +1967,10 @@ ASTReader::ReadASTBlock(Module &F) {
       if (!Record.empty() && Listener)
         Listener->ReadCounter(Record[0]);
       break;
+      
+    case FILE_SORTED_DECLS:
+      F.FileSortedDecls = (const DeclID *)BlobStart;
+      break;
 
     case SOURCE_LOCATION_OFFSETS: {
       F.SLocEntryOffsets = (const uint32_t *)BlobStart;