InstrProf: Give coverage its own errors instead of piggy backing on instrprof

Since the coverage mapping reader and the instrprof reader were
emitting a shared set of error codes, the error messages you'd get
back from llvm-cov were ambiguous about what was actually wrong. Add
another error category to fix this.

I've also improved the wording on a couple of the instrprof errors,
for consistency.

llvm-svn: 236665

1 files changed, 4 insertions, 4 deletions

diff --git a/llvm/lib/ProfileData/InstrProf.cpp b/llvm/lib/ProfileData/InstrProf.cpp
index 900dff96739..92822a71402 100644
--- a/llvm/lib/ProfileData/InstrProf.cpp
+++ b/llvm/lib/ProfileData/InstrProf.cpp
@@ -29,13 +29,13 @@ class InstrProfErrorCategoryType : public std::error_category {
     case instrprof_error::eof:
       return "End of File";
     case instrprof_error::bad_magic:
-      return "Invalid file format (bad magic)";
+      return "Invalid profile data (bad magic)";
     case instrprof_error::bad_header:
-      return "Invalid header";
+      return "Invalid profile data (file header is corrupt)";
     case instrprof_error::unsupported_version:
-      return "Unsupported format version";
+      return "Unsupported profiling format version";
     case instrprof_error::unsupported_hash_type:
-      return "Unsupported hash function";
+      return "Unsupported profiling hash";
     case instrprof_error::too_large:
       return "Too much profile data";
     case instrprof_error::truncated: