When deserializing CXXBaseSpecifiers (and offsets), make sure to walk the chain in the correct order.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@127315 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Serialization/ASTReader.cpp b/lib/Serialization/ASTReader.cpp
index 72637c1..4717cd6 100644
--- a/lib/Serialization/ASTReader.cpp
+++ b/lib/Serialization/ASTReader.cpp
@@ -3730,11 +3730,13 @@
--ID;
uint64_t Offset = 0;
for (unsigned I = 0, N = Chain.size(); I != N; ++I) {
- if (ID < Chain[I]->LocalNumCXXBaseSpecifiers)
- return Offset + Chain[I]->CXXBaseSpecifiersOffsets[ID];
+ PerFileData &F = *Chain[N - I - 1];
+
+ if (ID < F.LocalNumCXXBaseSpecifiers)
+ return Offset + F.CXXBaseSpecifiersOffsets[ID];
- ID -= Chain[I]->LocalNumCXXBaseSpecifiers;
- Offset += Chain[I]->SizeInBits;
+ ID -= F.LocalNumCXXBaseSpecifiers;
+ Offset += F.SizeInBits;
}
assert(false && "CXXBaseSpecifiers not found");
@@ -3745,14 +3747,14 @@
// Figure out which AST file contains this offset.
PerFileData *F = 0;
for (unsigned I = 0, N = Chain.size(); I != N; ++I) {
- if (Offset < Chain[I]->SizeInBits) {
- F = Chain[I];
+ if (Offset < Chain[N - I - 1]->SizeInBits) {
+ F = Chain[N - I - 1];
break;
}
- Offset -= Chain[I]->SizeInBits;
+ Offset -= Chain[N - I - 1]->SizeInBits;
}
-
+
if (!F) {
Error("Malformed AST file: C++ base specifiers at impossible offset");
return 0;