Index: cfe/trunk/test/Index/cindex-test-inclusions.c
===================================================================
--- cfe/trunk/test/Index/cindex-test-inclusions.c
+++ cfe/trunk/test/Index/cindex-test-inclusions.c
@@ -11,3 +11,14 @@
 // CHECK: included by:
 // CHECK: include_test.h:1:10
 // CHECK: cindex-test-inclusions.c:3:10
+
+// RUN: env CINDEXTEST_EDITING=1 c-index-test -test-inclusion-stack-source %s 2>&1 | FileCheck -check-prefix=REPARSE %s
+// REPARSE: include_test_2.h
+// REPARSE: included by:
+// REPARSE: include_test.h:1:10
+// REPARSE: cindex-test-inclusions.c:3:10
+// REPARSE: include_test.h
+// REPARSE: included by:
+// REPARSE: cindex-test-inclusions.c:3:10
+// REPARSE: cindex-test-inclusions.c
+// REPARSE: included by:
Index: cfe/trunk/tools/c-index-test/c-index-test.c
===================================================================
--- cfe/trunk/tools/c-index-test/c-index-test.c
+++ cfe/trunk/tools/c-index-test/c-index-test.c
@@ -1593,6 +1593,8 @@
   int num_unsaved_files = 0;
   enum CXErrorCode Err;
   int result;
+  unsigned Repeats = 0;
+  unsigned I;
 
   Idx = clang_createIndex(/* excludeDeclsFromPCH */
                           (!strcmp(filter, "local") || 
@@ -1609,6 +1611,9 @@
     return -1;
   }
 
+  if (getenv("CINDEXTEST_EDITING"))
+    Repeats = 5;
+
   Err = clang_parseTranslationUnit2(Idx, 0,
                                     argv + num_unsaved_files,
                                     argc - num_unsaved_files,
@@ -1622,6 +1627,22 @@
     return 1;
   }
 
+  for (I = 0; I != Repeats; ++I) {
+    if (checkForErrors(TU) != 0)
+      return -1;
+
+    if (Repeats > 1) {
+      Err = clang_reparseTranslationUnit(TU, num_unsaved_files, unsaved_files,
+                                         clang_defaultReparseOptions(TU));
+      if (Err != CXError_Success) {
+        describeLibclangFailure(Err);
+        free_remapped_files(unsaved_files, num_unsaved_files);
+        clang_disposeIndex(Idx);
+        return 1;
+      }
+    }
+  }
+
   result = perform_test_load(Idx, TU, filter, NULL, Visitor, PV,
                              CommentSchemaFile);
   free_remapped_files(unsaved_files, num_unsaved_files);
Index: cfe/trunk/tools/libclang/CIndexInclusionStack.cpp
===================================================================
--- cfe/trunk/tools/libclang/CIndexInclusionStack.cpp
+++ cfe/trunk/tools/libclang/CIndexInclusionStack.cpp
@@ -21,56 +21,81 @@
 #include "llvm/Support/raw_ostream.h"
 using namespace clang;
 
-extern "C" {
-void clang_getInclusions(CXTranslationUnit TU, CXInclusionVisitor CB,
-                         CXClientData clientData) {
-  if (cxtu::isNotUsableTU(TU)) {
-    LOG_BAD_TU(TU);
-    return;
-  }
-
+static void getInclusions(const SrcMgr::SLocEntry &(SourceManager::*Getter)(unsigned, bool*) const, unsigned n,
+                          CXTranslationUnit TU, CXInclusionVisitor CB,
+                          CXClientData clientData)
+{
   ASTUnit *CXXUnit = cxtu::getASTUnit(TU);
   SourceManager &SM = CXXUnit->getSourceManager();
   ASTContext &Ctx = CXXUnit->getASTContext();
-
   SmallVector<CXSourceLocation, 10> InclusionStack;
-  unsigned n =  SM.local_sloc_entry_size();
-
-  // In the case where all the SLocEntries are in an external source, traverse
-  // those SLocEntries as well.  This is the case where we are looking
-  // at the inclusion stack of an AST/PCH file.
-  const SrcMgr::SLocEntry &(SourceManager::*Getter)(unsigned, bool*) const;
-  if (n == 1) {
-    Getter = &SourceManager::getLoadedSLocEntry;
-    n = SM.loaded_sloc_entry_size();
-  } else
-    Getter = &SourceManager::getLocalSLocEntry;
+  const bool HasPreamble = SM.getPreambleFileID().isValid();
 
   for (unsigned i = 0 ; i < n ; ++i) {
     bool Invalid = false;
     const SrcMgr::SLocEntry &SL = (SM.*Getter)(i, &Invalid);
-    
+
     if (!SL.isFile() || Invalid)
       continue;
 
     const SrcMgr::FileInfo &FI = SL.getFile();
     if (!FI.getContentCache()->OrigEntry)
       continue;
-    
-    // Build the inclusion stack.
+
+    // If this is the main file, and there is a preamble, skip this SLoc. The
+    // inclusions of the preamble already showed it.
     SourceLocation L = FI.getIncludeLoc();
+    if (HasPreamble && CXXUnit->isInMainFileID(L))
+      continue;
+
+    // Build the inclusion stack.
     InclusionStack.clear();
     while (L.isValid()) {
       PresumedLoc PLoc = SM.getPresumedLoc(L);
       InclusionStack.push_back(cxloc::translateSourceLocation(Ctx, L));
       L = PLoc.isValid()? PLoc.getIncludeLoc() : SourceLocation();
     }
-            
+
+    // If there is a preamble, the last entry is the "inclusion" of that
+    // preamble into the main file, which has the bogus entry of main.c:1:1
+    if (HasPreamble && !InclusionStack.empty())
+      InclusionStack.pop_back();
+
     // Callback to the client.
     // FIXME: We should have a function to construct CXFiles.
     CB(static_cast<CXFile>(
-         const_cast<FileEntry *>(FI.getContentCache()->OrigEntry)), 
+         const_cast<FileEntry *>(FI.getContentCache()->OrigEntry)),
        InclusionStack.data(), InclusionStack.size(), clientData);
-  }    
+  }
+}
+
+
+extern "C" {
+void clang_getInclusions(CXTranslationUnit TU, CXInclusionVisitor CB,
+                         CXClientData clientData) {
+  if (cxtu::isNotUsableTU(TU)) {
+    LOG_BAD_TU(TU);
+    return;
+  }
+
+  SourceManager &SM = cxtu::getASTUnit(TU)->getSourceManager();
+  const unsigned n =  SM.local_sloc_entry_size();
+
+  // In the case where all the SLocEntries are in an external source, traverse
+  // those SLocEntries as well.  This is the case where we are looking
+  // at the inclusion stack of an AST/PCH file. Also, if we are not looking at
+  // a AST/PCH file, but this file has a pre-compiled preamble, we also need
+  // to look in that file.
+  if (n == 1 || SM.getPreambleFileID().isValid()) {
+    getInclusions(&SourceManager::getLoadedSLocEntry,
+                  SM.loaded_sloc_entry_size(), TU, CB, clientData);
+  }
+
+  // Not a PCH/AST file. Note, if there is a preamble, it could still be that
+  // there are #includes in this file (e.g. for any include after the first
+  // declaration).
+  if (n != 1)
+    getInclusions(&SourceManager::getLocalSLocEntry, n, TU, CB, clientData);
+
 }
 } // end extern C