[ORC] Switch to asynchronous resolution in JITSymbolResolver.

Asynchronous resolution (where the caller receives a callback once the requested
set of symbols are resolved) is a core part of the new concurrent ORC APIs. This
change extends the asynchronous resolution model down to RuntimeDyld, which is
necessary to prevent deadlocks when compiling/linking on a fixed number of
threads: If RuntimeDyld's linking process were a blocking operation, then any
complete K-graph in a program will require at least K threads to link in the
worst case, as each thread would block waiting for all the others to complete.
Using callbacks instead allows the work to be passed between dependent threads
until it is complete.

For backwards compatibility, all existing RuntimeDyld functions will continue
to operate in blocking mode as before. This change will enable the introduction
of a new async finalization process in a subsequent patch to enable asynchronous
JIT linking.

llvm-svn: 342939

1 files changed, 23 insertions, 15 deletions

diff --git a/llvm/lib/ExecutionEngine/RuntimeDyld/JITSymbol.cpp b/llvm/lib/ExecutionEngine/RuntimeDyld/JITSymbol.cpp
index d865216cf31..b6ef8ad9675 100644
--- a/llvm/lib/ExecutionEngine/RuntimeDyld/JITSymbol.cpp
+++ b/llvm/lib/ExecutionEngine/RuntimeDyld/JITSymbol.cpp
@@ -62,34 +62,42 @@ llvm::ARMJITSymbolFlags::fromObjectSymbol(const object::SymbolRef &Symbol) {
 /// Performs lookup by, for each symbol, first calling
 ///        findSymbolInLogicalDylib and if that fails calling
 ///        findSymbol.
-Expected<JITSymbolResolver::LookupResult>
-LegacyJITSymbolResolver::lookup(const LookupSet &Symbols) {
+void LegacyJITSymbolResolver::lookup(const LookupSet &Symbols,
+                                     OnResolvedFunction OnResolved) {
   JITSymbolResolver::LookupResult Result;
   for (auto &Symbol : Symbols) {
     std::string SymName = Symbol.str();
     if (auto Sym = findSymbolInLogicalDylib(SymName)) {
       if (auto AddrOrErr = Sym.getAddress())
         Result[Symbol] = JITEvaluatedSymbol(*AddrOrErr, Sym.getFlags());
-      else
-        return AddrOrErr.takeError();
-    } else if (auto Err = Sym.takeError())
-      return std::move(Err);
-    else {
+      else {
+        OnResolved(AddrOrErr.takeError());
+        return;
+      }
+    } else if (auto Err = Sym.takeError()) {
+      OnResolved(std::move(Err));
+      return;
+    } else {
       // findSymbolInLogicalDylib failed. Lets try findSymbol.
       if (auto Sym = findSymbol(SymName)) {
         if (auto AddrOrErr = Sym.getAddress())
           Result[Symbol] = JITEvaluatedSymbol(*AddrOrErr, Sym.getFlags());
-        else
-          return AddrOrErr.takeError();
-      } else if (auto Err = Sym.takeError())
-        return std::move(Err);
-      else
-        return make_error<StringError>("Symbol not found: " + Symbol,
-                                       inconvertibleErrorCode());
+        else {
+          OnResolved(AddrOrErr.takeError());
+          return;
+        }
+      } else if (auto Err = Sym.takeError()) {
+        OnResolved(std::move(Err));
+        return;
+      } else {
+        OnResolved(make_error<StringError>("Symbol not found: " + Symbol,
+                                           inconvertibleErrorCode()));
+        return;
+      }
     }
   }
 
-  return std::move(Result);
+  OnResolved(std::move(Result));
 }
 
 /// Performs flags lookup by calling findSymbolInLogicalDylib and