Keep track of the size/modification time of each file source-location

entry in a precompiled header, so that we can detect modified files
even when we miss in the stat cache.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@99149 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 12 insertions, 5 deletions

diff --git a/lib/Frontend/PCHReader.cpp b/lib/Frontend/PCHReader.cpp
index e659ff047d..8fd81df098 100644
--- a/lib/Frontend/PCHReader.cpp
+++ b/lib/Frontend/PCHReader.cpp
@@ -905,11 +905,18 @@ PCHReader::PCHReadResult PCHReader::ReadSLocEntryRecord(unsigned ID) {
       return Failure;
     }
 
-    if (Record.size() < 8) {
+    if (Record.size() < 10) {
       Error("source location entry is incorrect");
       return Failure;
     }
 
+    if ((off_t)Record[4] != File->getSize() ||
+        (time_t)Record[5] != File->getModificationTime()) {
+      Diag(diag::err_fe_pch_file_modified)
+        << Filename;
+      return Failure;
+    }
+
     FileID FID = SourceMgr.createFileID(File,
                                 SourceLocation::getFromRawEncoding(Record[1]),
                                        (SrcMgr::CharacteristicKind)Record[2],
@@ -920,10 +927,10 @@ PCHReader::PCHReadResult PCHReader::ReadSLocEntryRecord(unsigned ID) {
 
     // Reconstruct header-search information for this file.
     HeaderFileInfo HFI;
-    HFI.isImport = Record[4];
-    HFI.DirInfo = Record[5];
-    HFI.NumIncludes = Record[6];
-    HFI.ControllingMacroID = Record[7];
+    HFI.isImport = Record[6];
+    HFI.DirInfo = Record[7];
+    HFI.NumIncludes = Record[8];
+    HFI.ControllingMacroID = Record[9];
     if (Listener)
       Listener->ReadHeaderFileInfo(HFI, File->getUID());
     break;