add some assertions so that the rewriter dies violently with a useful

error instead of subtly with a mysterious one.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@46287 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 0 deletions

diff --git a/Rewrite/Rewriter.cpp b/Rewrite/Rewriter.cpp
index 7744a0c4ff..62d0432f0a 100644
--- a/Rewrite/Rewriter.cpp
+++ b/Rewrite/Rewriter.cpp
@@ -208,6 +208,7 @@ RewriteBuffer &Rewriter::getEditBuffer(unsigned FileID) {
 /// locations.
 void Rewriter::InsertText(SourceLocation Loc,
                           const char *StrData, unsigned StrLen) {
+  assert(isRewritable(Loc) && "Not a rewritable location!");
   unsigned FileID;
   unsigned StartOffs = getLocationOffsetAndFileID(Loc, FileID);
   getEditBuffer(FileID).InsertText(StartOffs, StrData, StrLen);
@@ -216,6 +217,7 @@ void Rewriter::InsertText(SourceLocation Loc,
 /// RemoveText - Remove the specified text region.  This method is only valid
 /// on a rewritable source location.
 void Rewriter::RemoveText(SourceLocation Start, unsigned Length) {
+  assert(isRewritable(Start) && "Not a rewritable location!");
   unsigned FileID;
   unsigned StartOffs = getLocationOffsetAndFileID(Start, FileID);
   getEditBuffer(FileID).RemoveText(StartOffs, Length);