[ORC] Start migrating ORC layers to use the new ORC Core.h APIs.

In particular this patch switches RTDyldObjectLinkingLayer to use
orc::SymbolResolver and threads the requried changse (ExecutionSession
references and VModuleKeys) through the existing layer APIs.

The purpose of the new resolver interface is to improve query performance and
better support parallelism, both in JIT'd code and within the compiler itself.

The most visibile change is switch of the <Layer>::addModule signatures from:

Expected<Handle> addModule(std::shared_ptr<ModuleType> Mod,
                           std::shared_ptr<JITSymbolResolver> Resolver)

to:

Expected<Handle> addModule(VModuleKey K, std::shared_ptr<ModuleType> Mod);

Typical usage of addModule will now look like:

auto K = ES.allocateVModuleKey();
Resolvers[K] = createSymbolResolver(...);
Layer.addModule(K, std::move(Mod));

See the BuildingAJIT tutorial code for example usage.

llvm-svn: 324405

1 files changed, 15 insertions, 4 deletions

diff --git a/llvm/lib/ExecutionEngine/Orc/Legacy.cpp b/llvm/lib/ExecutionEngine/Orc/Legacy.cpp
index 7a11b94c7cf..240e0f8ba1d 100644
--- a/llvm/lib/ExecutionEngine/Orc/Legacy.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/Legacy.cpp
@@ -45,10 +45,21 @@ JITSymbolResolverAdapter::lookup(const LookupSet &Symbols) {
 
   auto UnresolvedSymbols = R.lookup(Query, InternedSymbols);
 
-  if (!UnresolvedSymbols.empty())
-    Err = joinErrors(std::move(Err),
-                     make_error<StringError>("Unresolved symbols",
-                                             inconvertibleErrorCode()));
+  if (!UnresolvedSymbols.empty()) {
+    std::string ErrorMsg = "Unresolved symbols: ";
+
+    ErrorMsg += **UnresolvedSymbols.begin();
+    for (auto I = std::next(UnresolvedSymbols.begin()),
+              E = UnresolvedSymbols.end();
+         I != E; ++I) {
+      ErrorMsg += ", ";
+      ErrorMsg += **I;
+    }
+
+    Err =
+        joinErrors(std::move(Err),
+                   make_error<StringError>(ErrorMsg, inconvertibleErrorCode()));
+  }
 
   if (Err)
     return std::move(Err);