[ProfData] Detect if zlib is available
As discussed on [1], if the profile is compressed and llvm-profdata is not built with zlib support, the error message is not informative. Give a better error message if zlib is not available.
[1] http://lists.llvm.org/pipermail/llvm-dev/2017-July/115571.html
Reviewers: davidxl, dblaikie
Differential Revision: https://reviews.llvm.org/D35586
llvm-svn: 308789
diff --git a/llvm/lib/ProfileData/InstrProf.cpp b/llvm/lib/ProfileData/InstrProf.cpp
index 48c1643..a732bed 100644
--- a/llvm/lib/ProfileData/InstrProf.cpp
+++ b/llvm/lib/ProfileData/InstrProf.cpp
@@ -111,6 +111,8 @@
return "Failed to uncompress data (zlib)";
case instrprof_error::empty_raw_profile:
return "Empty raw profile file";
+ case instrprof_error::zlib_unavailable:
+ return "Profile uses zlib compression but the profile reader was built without zlib support";
}
llvm_unreachable("A value of instrprof_error has no message.");
}
@@ -430,6 +432,9 @@
SmallString<128> UncompressedNameStrings;
StringRef NameStrings;
if (isCompressed) {
+ if (!llvm::zlib::isAvailable())
+ return make_error<InstrProfError>(instrprof_error::zlib_unavailable);
+
StringRef CompressedNameStrings(reinterpret_cast<const char *>(P),
CompressedSize);
if (Error E =