[ORC] Improve debugging output for ORC.

(1) Print debugging output under a session lock to avoid garbled messages when
compiling on multiple threads.

(2) Name MaterializationUnits, add an ostream operator for them, and so they can
be easily referenced in debugging output, and have that ostream operator
optionally print code/data/hidden symbols provided by that materialization unit
based on command line options.

llvm-svn: 343323

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/ExecutionEngine/Orc/LazyReexports.cpp b/llvm/lib/ExecutionEngine/Orc/LazyReexports.cpp
index c3270053d2d..72db80bea87 100644
--- a/llvm/lib/ExecutionEngine/Orc/LazyReexports.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/LazyReexports.cpp
@@ -135,6 +135,10 @@ LazyReexportsMaterializationUnit::LazyReexportsMaterializationUnit(
             return ISManager.updatePointer(*SymbolName, ResolvedAddr);
           })) {}
 
+StringRef LazyReexportsMaterializationUnit::getName() const {
+  return "<Lazy Reexports>";
+}
+
 void LazyReexportsMaterializationUnit::materialize(
     MaterializationResponsibility R) {
   auto RequestedSymbols = R.getRequestedSymbols();