[YAMLTraits] Add filename support to yaml::Input

Summary:
The current yaml::Input constructor takes a StringRef of data as its
first parameter, discarding any filename information that may have been
present when a YAML file was opened. Add an alterate yaml::Input
constructor that takes a MemoryBufferRef, which can have a filename
associated with it. This leads to clearer diagnostic messages.

Sponsored By: DARPA, AFRL

Reviewed By: arphaman

Differential Revision: https://reviews.llvm.org/D35398

Patch by: Jonathan Anderson (trombonehero)

llvm-svn: 308172

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/lib/Support/YAMLTraits.cpp b/llvm/lib/Support/YAMLTraits.cpp
index 601084f9eae..65eda246a7f 100644
--- a/llvm/lib/Support/YAMLTraits.cpp
+++ b/llvm/lib/Support/YAMLTraits.cpp
@@ -60,6 +60,14 @@ Input::Input(StringRef InputContent, void *Ctxt,
   DocIterator = Strm->begin();
 }
 
+Input::Input(MemoryBufferRef Input, void *Ctxt,
+             SourceMgr::DiagHandlerTy DiagHandler, void *DiagHandlerCtxt)
+    : IO(Ctxt), Strm(new Stream(Input, SrcMgr, false, &EC)) {
+  if (DiagHandler)
+    SrcMgr.setDiagHandler(DiagHandler, DiagHandlerCtxt);
+  DocIterator = Strm->begin();
+}
+
 Input::~Input() = default;
 
 std::error_code Input::error() { return EC; }