[PCH] Fixed bug with preamble invalidation when overridden files change

When remapped files were changed, they would not always cause the preamble's PCH to be invalidated, because the remapped path didn't necessarily match the include path (e.g. slash direction -- this happens a lot on Windows). I fixed this by moving to a llvm::sys::fs::UniqueID-based map instead of comparing paths stringwise.

Differential Revision: http://reviews.llvm.org/D20137

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@269769 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Frontend/ASTUnit.cpp b/lib/Frontend/ASTUnit.cpp
index 61e80d5d729b686ddb58ab22d04f270b9321f701..71a76a45ba5cb041a6d6478d9b25685a65e03d2c 100644 (file)
--- a/lib/Frontend/ASTUnit.cpp
+++ b/lib/Frontend/ASTUnit.cpp
@@ -1378,7 +1378,7 @@ ASTUnit::getMainBufferWithPrecompiledPreamble(
           
       // First, make a record of those files that have been overridden via
       // remapping or unsaved_files.
-      llvm::StringMap<PreambleFileHash> OverriddenFiles;
+      std::map<llvm::sys::fs::UniqueID, PreambleFileHash> OverriddenFiles;
       for (const auto &R : PreprocessorOpts.RemappedFiles) {
         if (AnyFileChanged)
           break;
@@ -1391,24 +1391,38 @@ ASTUnit::getMainBufferWithPrecompiledPreamble(
           break;
         }
 
-        OverriddenFiles[R.first] = PreambleFileHash::createForFile(
+        OverriddenFiles[Status.getUniqueID()] = PreambleFileHash::createForFile(
             Status.getSize(), Status.getLastModificationTime().toEpochTime());
       }
 
       for (const auto &RB : PreprocessorOpts.RemappedFileBuffers) {
         if (AnyFileChanged)
           break;
-        OverriddenFiles[RB.first] =
+
+        vfs::Status Status;
+        if (FileMgr->getNoncachedStatValue(RB.first, Status)) {
+          AnyFileChanged = true;
+          break;
+        }
+
+        OverriddenFiles[Status.getUniqueID()] =
             PreambleFileHash::createForMemoryBuffer(RB.second);
       }
        
       // Check whether anything has changed.
-      for (llvm::StringMap<PreambleFileHash>::iterator 
+      for (llvm::StringMap<PreambleFileHash>::iterator
              F = FilesInPreamble.begin(), FEnd = FilesInPreamble.end();
            !AnyFileChanged && F != FEnd; 
            ++F) {
-        llvm::StringMap<PreambleFileHash>::iterator Overridden
-          = OverriddenFiles.find(F->first());
+        vfs::Status Status;
+        if (FileMgr->getNoncachedStatValue(F->first(), Status)) {
+          // If we can't stat the file, assume that something horrible happened.
+          AnyFileChanged = true;
+          break;
+        }
+
+        std::map<llvm::sys::fs::UniqueID, PreambleFileHash>::iterator Overridden
+          = OverriddenFiles.find(Status.getUniqueID());
         if (Overridden != OverriddenFiles.end()) {
           // This file was remapped; check whether the newly-mapped file 
           // matches up with the previous mapping.
@@ -1418,13 +1432,9 @@ ASTUnit::getMainBufferWithPrecompiledPreamble(
         }
         
         // The file was not remapped; check whether it has changed on disk.
-        vfs::Status Status;
-        if (FileMgr->getNoncachedStatValue(F->first(), Status)) {
-          // If we can't stat the file, assume that something horrible happened.
-          AnyFileChanged = true;
-        } else if (Status.getSize() != uint64_t(F->second.Size) ||
-                   Status.getLastModificationTime().toEpochTime() !=
-                       uint64_t(F->second.ModTime))
+        if (Status.getSize() != uint64_t(F->second.Size) ||
+            Status.getLastModificationTime().toEpochTime() !=
+                uint64_t(F->second.ModTime))
           AnyFileChanged = true;
       }