[PATCH] D42057: [FileCheck] - Do not crash on empty document when parsing --check-prefix.

[George Rimar via Phabricator via llvm-commits]

grimar updated this revision to Diff 129825.
grimar added a comment.

- Added patch context.


https://reviews.llvm.org/D42057

Files:
  test/FileCheck/check-empty2.txt
  utils/FileCheck/FileCheck.cpp


Index: utils/FileCheck/FileCheck.cpp
===================================================================
--- utils/FileCheck/FileCheck.cpp
+++ utils/FileCheck/FileCheck.cpp
@@ -718,6 +718,9 @@
 }
 
 static Check::CheckType FindCheckType(StringRef Buffer, StringRef Prefix) {
+  if (Buffer.size() <= Prefix.size())
+    return Check::CheckNone;
+
   char NextChar = Buffer[Prefix.size()];
 
   // Verify that the : is present after the prefix.
Index: test/FileCheck/check-empty2.txt
===================================================================
--- test/FileCheck/check-empty2.txt
+++ test/FileCheck/check-empty2.txt
@@ -0,0 +1,3 @@
+; Check that tool does not crash for empty file.
+
+; RUN: not FileCheck -input-file %s %s -check-prefix=A
\ No newline at end of file


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