[ORC] Switch to WrapperFunction utility for calls to registration functions.

Addresses FIXMEs in TPC-based EH-frame and debug object registration code by
replacing manual argument serialization with WrapperFunction utility calls.

llvm/include/llvm/ExecutionEngine/Orc/Shared/WrapperFunctionUtils.h

@@ -372,13 +372,15 @@ public:
     if (!ArgBuffer)
       return ArgBuffer.takeError();
 
-    WrapperFunctionResult ResultBuffer =
+    Expected<WrapperFunctionResult> ResultBuffer =
         Caller(ArgBuffer->data(), ArgBuffer->size());
-    if (auto ErrMsg = ResultBuffer.getOutOfBandError())
+    if (!ResultBuffer)
+      return ResultBuffer.takeError();
+    if (auto ErrMsg = ResultBuffer->getOutOfBandError())
       return make_error<StringError>(ErrMsg, inconvertibleErrorCode());
 
     return detail::ResultDeserializer<SPSRetTagT, RetT>::deserialize(
-        Result, ResultBuffer.data(), ResultBuffer.size());
+        Result, ResultBuffer->data(), ResultBuffer->size());
   }
 
   /// Handle a call to a wrapper function.

llvm/include/llvm/ExecutionEngine/Orc/TPCDebugObjectRegistrar.h

@@ -22,6 +22,8 @@
 #include <memory>
 #include <vector>
 
+using namespace llvm::orc::shared;
+
 namespace llvm {
 namespace orc {
 
@@ -36,24 +38,19 @@ public:
 /// target process.
 class TPCDebugObjectRegistrar : public DebugObjectRegistrar {
 public:
-  using SerializeBlockInfoFn =
-      std::vector<uint8_t> (*)(sys::MemoryBlock TargetMemBlock);
-
   TPCDebugObjectRegistrar(TargetProcessControl &TPC,
-                          JITTargetAddress RegisterFn,
-                          SerializeBlockInfoFn SerializeBlockInfo)
-      : TPC(TPC), RegisterFn(RegisterFn),
-        SerializeBlockInfo(SerializeBlockInfo) {}
+                          JITTargetAddress RegisterFn)
+      : TPC(TPC), RegisterFn(RegisterFn) {}
 
   Error registerDebugObject(sys::MemoryBlock TargetMem) override {
-    return TPC.runWrapper(RegisterFn, SerializeBlockInfo(TargetMem))
-        .takeError();
+    return WrapperFunction<void(SPSTargetAddress, uint64_t)>::call(
+        TPCCaller(TPC, RegisterFn), pointerToJITTargetAddress(TargetMem.base()),
+        static_cast<uint64_t>(TargetMem.allocatedSize()));
   }
 
 private:
   TargetProcessControl &TPC;
   JITTargetAddress RegisterFn;
-  SerializeBlockInfoFn SerializeBlockInfo;
 };
 
 /// Create a TargetProcessControl-based DebugObjectRegistrar that emits debug

llvm/include/llvm/ExecutionEngine/Orc/TargetProcessControl.h

@@ -163,6 +163,23 @@ protected:
   jitlink::JITLinkMemoryManager *MemMgr = nullptr;
 };
 
+/// Call a wrapper function via TargetProcessControl::runWrapper.
+class TPCCaller {
+public:
+  TPCCaller(TargetProcessControl &TPC, JITTargetAddress WrapperFnAddr)
+      : TPC(TPC), WrapperFnAddr(WrapperFnAddr) {}
+  Expected<shared::WrapperFunctionResult> operator()(const char *ArgData,
+                                                     size_t ArgSize) const {
+    return TPC.runWrapper(
+        WrapperFnAddr,
+        ArrayRef<uint8_t>(reinterpret_cast<const uint8_t *>(ArgData), ArgSize));
+  }
+
+private:
+  TargetProcessControl &TPC;
+  JITTargetAddress WrapperFnAddr;
+};
+
 /// A TargetProcessControl implementation targeting the current process.
 class SelfTargetProcessControl : public TargetProcessControl,
                                  private TargetProcessControl::MemoryAccess {

llvm/lib/ExecutionEngine/Orc/TPCDebugObjectRegistrar.cpp

@@ -15,24 +15,6 @@
 namespace llvm {
 namespace orc {
 
-// Counterpart for readDebugObjectInfo() in TargetProcess/JITLoaderGDB.cpp
-static std::vector<uint8_t>
-writeDebugObjectInfo(sys::MemoryBlock TargetMemBlock) {
-  auto DebugObjAddr = pointerToJITTargetAddress(TargetMemBlock.base());
-  uint64_t DebugObjSize = TargetMemBlock.allocatedSize();
-
-  std::vector<uint8_t> ArgBuffer;
-  ArgBuffer.resize(sizeof(decltype(DebugObjAddr)) +
-                   sizeof(decltype(DebugObjSize)));
-
-  // FIXME: Replace manual serializatio with WrapperFunction utility.
-  BinaryStreamWriter ArgWriter(ArgBuffer, support::endianness::little);
-  cantFail(ArgWriter.writeInteger(DebugObjAddr));
-  cantFail(ArgWriter.writeInteger(DebugObjSize));
-
-  return ArgBuffer;
-}
-
 Expected<std::unique_ptr<TPCDebugObjectRegistrar>>
 createJITLoaderGDBRegistrar(TargetProcessControl &TPC) {
   auto ProcessHandle = TPC.loadDylib(nullptr);
@@ -55,8 +37,7 @@ createJITLoaderGDBRegistrar(TargetProcessControl &TPC) {
   assert((*Result)[0].size() == 1 &&
          "Unexpected number of addresses in result");
 
-  return std::make_unique<TPCDebugObjectRegistrar>(TPC, (*Result)[0][0],
-                                                   &writeDebugObjectInfo);
+  return std::make_unique<TPCDebugObjectRegistrar>(TPC, (*Result)[0][0]);
 }
 
 } // namespace orc

llvm/lib/ExecutionEngine/Orc/TPCEHFrameRegistrar.cpp

@@ -9,6 +9,8 @@
 #include "llvm/ExecutionEngine/Orc/TPCEHFrameRegistrar.h"
 #include "llvm/Support/BinaryStreamWriter.h"
 
+using namespace llvm::orc::shared;
+
 namespace llvm {
 namespace orc {
 
@@ -52,32 +54,17 @@ TPCEHFrameRegistrar::Create(TargetProcessControl &TPC) {
 
 Error TPCEHFrameRegistrar::registerEHFrames(JITTargetAddress EHFrameSectionAddr,
                                             size_t EHFrameSectionSize) {
-  constexpr size_t ArgBufferSize = sizeof(uint64_t) + sizeof(uint64_t);
-  uint8_t ArgBuffer[ArgBufferSize];
 
-  // FIXME: Replace manual serialization with WrapperFunction util call.
-  BinaryStreamWriter ArgWriter(
-      MutableArrayRef<uint8_t>(ArgBuffer, ArgBufferSize),
-      support::endianness::little);
-  cantFail(ArgWriter.writeInteger(static_cast<uint64_t>(EHFrameSectionAddr)));
-  cantFail(ArgWriter.writeInteger(static_cast<uint64_t>(EHFrameSectionSize)));
-
-  return TPC.runWrapper(RegisterEHFrameWrapperFnAddr, ArgBuffer).takeError();
+  return WrapperFunction<void(SPSTargetAddress, uint64_t)>::call(
+      TPCCaller(TPC, RegisterEHFrameWrapperFnAddr), EHFrameSectionAddr,
+      static_cast<uint64_t>(EHFrameSectionSize));
 }
 
 Error TPCEHFrameRegistrar::deregisterEHFrames(
     JITTargetAddress EHFrameSectionAddr, size_t EHFrameSectionSize) {
-  constexpr size_t ArgBufferSize = sizeof(uint64_t) + sizeof(uint64_t);
-  uint8_t ArgBuffer[ArgBufferSize];
-
-  // FIXME: Replace manual serialization with WrapperFunction util call.
-  BinaryStreamWriter ArgWriter(
-      MutableArrayRef<uint8_t>(ArgBuffer, ArgBufferSize),
-      support::endianness::little);
-  cantFail(ArgWriter.writeInteger(static_cast<uint64_t>(EHFrameSectionAddr)));
-  cantFail(ArgWriter.writeInteger(static_cast<uint64_t>(EHFrameSectionSize)));
-
-  return TPC.runWrapper(DeregisterEHFrameWrapperFnAddr, ArgBuffer).takeError();
+  return WrapperFunction<void(SPSTargetAddress, uint64_t)>::call(
+      TPCCaller(TPC, DeregisterEHFrameWrapperFnAddr), EHFrameSectionAddr,
+      static_cast<uint64_t>(EHFrameSectionSize));
 }
 
 } // end namespace orc