[compiler-rt] Add more diagnostic to InstrProfError

If profile data is malformed for any kind of reason, we generate
an error that only reports "malformed instrumentation profile data"
without any further information. This patch extends InstrProfError
class to receive an optional error message argument, so that we can
do better error reporting.

Differential Revision: https://reviews.llvm.org/D108942

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/ProfileData/Coverage/CoverageMappingReader.cpp b/llvm/lib/ProfileData/Coverage/CoverageMappingReader.cpp
index 9fffb24..94bd480 100644
--- a/llvm/lib/ProfileData/Coverage/CoverageMappingReader.cpp
+++ b/llvm/lib/ProfileData/Coverage/CoverageMappingReader.cpp
@@ -567,7 +567,8 @@ class VersionedCovMapFuncRecordReader : public CovMapFuncRecordReader {
       if (Error Err = CFR->template getFuncName<Endian>(ProfileNames, FuncName))
         return Err;
       if (FuncName.empty())
-        return make_error<InstrProfError>(instrprof_error::malformed);
+        return make_error<InstrProfError>(instrprof_error::malformed,
+                                          "function name is empty");
       ++CovMapNumUsedRecords;
       Records.emplace_back(Version, FuncName, FuncHash, Mapping,
                            FileRange.StartingIndex, FileRange.Length);