Initial implementation of a record-level bitcode fuzzer.

include/llvm/Bitcode/NaCl/NaClBitcodeMungeUtils.h

 //===- NaClBitcodeMungeUtils.h - Munge bitcode records --------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines utility class NaClMungedBitcode to edit a base
@@ skipping 220 matching lines @@
   /// \param AddHeader Add header block when true.
   /// \param Flags Write flags to use.
   ///
   /// \return Returns the results of the write.
   WriteResults writeMaybeRepair(
       SmallVectorImpl<char> &Buffer, bool AddHeader,
       const WriteFlags &Flags) const;
 
   bool write(SmallVectorImpl<char> &Buffer, bool AddHeader,
              const WriteFlags &Flags) const {
-    return writeMaybeRepair(Buffer, AddHeader, Flags).NumErrors == 0;
+    WriteResults Results = writeMaybeRepair(Buffer, AddHeader, Flags);
+    return Results.NumErrors == 0
+        || (Flags.getTryToRecover() && Results.NumErrors == Results.NumRepairs);
   }
 
   bool write(SmallVectorImpl<char> &Buffer, bool AddHeader) const {
     WriteFlags Flags;
     return write(Buffer, AddHeader, Flags);
   }
 
   /// \brief The types of editing actions that can be applied.
   enum EditAction {
     AddBefore, // Insert new record before base record at index.
@@ skipping 200 matching lines @@
   }
 
   // \brief Moves the iterator to the position of the next edited
   // record.
   void updatePosition();
 };
 
 } // end namespace llvm.
 
 #endif // LLVM_BITCODE_NACL_NACLBITCODEMUNGE_H