[Object] Change Archive::findSym to return an Expected<Optional<Child>>.

As suggested by Rafael in review of D22079 - this was accidentally left out of
the final commit (r275316).

llvm-svn: 275469

Author: lhames

llvm/include/llvm/Object/Archive.h

@@ -14,6 +14,7 @@
 #ifndef LLVM_OBJECT_ARCHIVE_H
 #define LLVM_OBJECT_ARCHIVE_H
 
+#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/iterator_range.h"
 #include "llvm/Object/Binary.h"
@@ -215,7 +216,7 @@ class Archive : public Binary {
   }
 
   // check if a symbol is in the archive
-  child_iterator findSym(Error &Err, StringRef name) const;
+  Expected<Optional<Child>> findSym(StringRef name) const;
 
   bool hasSymbolTable() const;
   StringRef getSymbolTable() const { return SymbolTable; }

llvm/lib/ExecutionEngine/MCJIT/MCJIT.cpp

@@ -327,14 +327,14 @@ RuntimeDyld::SymbolInfo MCJIT::findSymbol(const std::string &Name,
   for (object::OwningBinary<object::Archive> &OB : Archives) {
     object::Archive *A = OB.getBinary();
     // Look for our symbols in each Archive
-    Error Err;
-    object::Archive::child_iterator ChildIt = A->findSym(Err, Name);
-    if (Err)
-      report_fatal_error(std::move(Err));
-    if (ChildIt != A->child_end()) {
+    auto OptionalChildOrErr = A->findSym(Name);
+    if (!OptionalChildOrErr)
+      report_fatal_error(OptionalChildOrErr.takeError());
+    auto &OptionalChild = *OptionalChildOrErr;
+    if (OptionalChild) {
       // FIXME: Support nested archives?
       Expected<std::unique_ptr<object::Binary>> ChildBinOrErr =
-          ChildIt->getAsBinary();
+          OptionalChild->getAsBinary();
       if (!ChildBinOrErr) {
         // TODO: Actually report errors helpfully.
         consumeError(ChildBinOrErr.takeError());

llvm/lib/ExecutionEngine/Orc/OrcMCJITReplacement.h

@@ -258,14 +258,14 @@ class OrcMCJITReplacement : public ExecutionEngine {
     for (object::OwningBinary<object::Archive> &OB : Archives) {
       object::Archive *A = OB.getBinary();
       // Look for our symbols in each Archive
-      Error Err;
-      object::Archive::child_iterator ChildIt = A->findSym(Err, Name);
-      if (Err)
-        report_fatal_error(std::move(Err));
-      if (ChildIt != A->child_end()) {
+      auto OptionalChildOrErr = A->findSym(Name);
+      if (!OptionalChildOrErr)
+        report_fatal_error(OptionalChildOrErr.takeError());
+      auto &OptionalChild = *OptionalChildOrErr;
+      if (OptionalChild) {
         // FIXME: Support nested archives?
         Expected<std::unique_ptr<object::Binary>> ChildBinOrErr =
-            ChildIt->getAsBinary();
+            OptionalChild->getAsBinary();
         if (!ChildBinOrErr) {
           // TODO: Actually report errors helpfully.
           consumeError(ChildBinOrErr.takeError());

llvm/lib/Object/Archive.cpp

@@ -667,23 +667,20 @@ uint32_t Archive::getNumberOfSymbols() const {
   return read32le(buf);
 }
 
-Archive::child_iterator Archive::findSym(Error &Err, StringRef name) const {
+Expected<Optional<Archive::Child>> Archive::findSym(StringRef name) const {
   Archive::symbol_iterator bs = symbol_begin();
   Archive::symbol_iterator es = symbol_end();
 
   for (; bs != es; ++bs) {
     StringRef SymName = bs->getName();
     if (SymName == name) {
-      if (auto MemberOrErr = bs->getMember()) {
-        return child_iterator(*MemberOrErr, &Err);
-      } else {
-        ErrorAsOutParameter ErrAsOutParam(Err);
-        Err = errorCodeToError(MemberOrErr.getError());
-        return child_end();
-      }
+      if (auto MemberOrErr = bs->getMember())
+        return Child(*MemberOrErr);
+      else
+        return errorCodeToError(MemberOrErr.getError());
     }
   }
-  return child_end();
+  return Optional<Child>();
 }
 
 bool Archive::hasSymbolTable() const { return !SymbolTable.empty(); }