Override SegmentViewVarHandle-related helper for JITServer

This commit adds JITServer support for the FE helper
VM_getLayoutVarHandle.

Signed-off-by: Nazim Bhuiyan <[email protected]>

Author: nbhuiyan

runtime/compiler/control/JITClientCompilationThread.cpp

@@ -1214,6 +1214,16 @@ handleServerMessage(JITServer::ClientStream *client, TR_J9VM *fe, JITServer::Mes
          client->write(response, mhIndex, mhObj);
          }
          break;
+      case MessageType::VM_getLayoutVarHandle:
+         {
+         auto recv = client->getRecvData<TR::KnownObjectTable::Index>();
+         TR::KnownObjectTable::Index vhIndex = fe->getLayoutVarHandle(comp, std::get<0>(recv));
+         uintptr_t* vhObj = NULL;
+         if (vhIndex != TR::KnownObjectTable::UNKNOWN)
+            vhObj = knot->getPointerLocation(vhIndex);
+         client->write(response, vhIndex, vhObj);
+         }
+         break;
 #endif // J9VM_OPT_OPENJDK_METHODHANDLE
       case MessageType::VM_isStable:
          {

runtime/compiler/env/VMJ9Server.cpp

@@ -2416,6 +2416,22 @@ TR_J9ServerVM::getMethodHandleTableEntryIndex(TR::Compilation *comp, TR::KnownOb
    return mhIndex;
    }
 
+TR::KnownObjectTable::Index
+TR_J9ServerVM::getLayoutVarHandle(TR::Compilation *comp, TR::KnownObjectTable::Index layoutIndex)
+   {
+   TR::KnownObjectTable *knot = comp->getKnownObjectTable();
+   if (!knot) return TR::KnownObjectTable::UNKNOWN;
+
+   JITServer::ServerStream *stream = _compInfoPT->getMethodBeingCompiled()->_stream;
+   stream->write(JITServer::MessageType::VM_getLayoutVarHandle, layoutIndex);
+   auto recv = stream->read<TR::KnownObjectTable::Index, uintptr_t *>();
+
+   TR::KnownObjectTable::Index vhIndex = std::get<0>(recv);
+   knot->updateKnownObjectTableAtServer(vhIndex, std::get<1>(recv));
+   return vhIndex;
+
+   }
+
 #endif /* defined(J9VM_OPT_OPENJDK_METHODHANDLE) */
 
 TR::KnownObjectTable::Index

runtime/compiler/env/VMJ9Server.hpp

@@ -245,6 +245,7 @@ class TR_J9ServerVM: public TR_J9VM
    virtual UDATA getVMTargetOffset() override;
    virtual UDATA getVMIndexOffset() override;
    virtual TR::KnownObjectTable::Index getMethodHandleTableEntryIndex(TR::Compilation *comp, TR::KnownObjectTable::Index vhIndex, TR::KnownObjectTable::Index adIndex) override;
+   virtual TR::KnownObjectTable::Index getLayoutVarHandle(TR::Compilation *comp, TR::KnownObjectTable::Index layoutIndex) override;
 #endif
    virtual TR::KnownObjectTable::Index getMemberNameFieldKnotIndexFromMethodHandleKnotIndex(TR::Compilation *comp, TR::KnownObjectTable::Index mhIndex, const char *fieldName) override;
    virtual bool isMethodHandleExpectedType(TR::Compilation *comp, TR::KnownObjectTable::Index mhIndex, TR::KnownObjectTable::Index expectedTypeIndex) override;

runtime/compiler/net/CommunicationStream.hpp

@@ -128,7 +128,7 @@ class CommunicationStream
    // likely to lose an increment when merging/rebasing/etc.
    //
    static const uint8_t MAJOR_NUMBER = 1;
-   static const uint16_t MINOR_NUMBER = 65; // ID: YxVkiLqD7B1LhYMv58y8
+   static const uint16_t MINOR_NUMBER = 66; // ID: bTqSAdP1ZbMfGwEp8jmB
    static const uint8_t PATCH_NUMBER = 0;
    static uint32_t CONFIGURATION_FLAGS;
 

runtime/compiler/net/MessageTypes.cpp

@@ -191,6 +191,7 @@ const char *messageNames[] =
    "VM_inSnapshotMode",
    "VM_isInvokeCacheEntryAnArray",
    "VM_getMethodHandleTableEntryIndex",
+   "VM_getLayoutVarHandle",
    "CompInfo_isCompiled",
    "CompInfo_getPCIfCompiled",
    "CompInfo_getInvocationCount",

runtime/compiler/net/MessageTypes.hpp

@@ -200,6 +200,7 @@ enum MessageType : uint16_t
    VM_inSnapshotMode,
    VM_isInvokeCacheEntryAnArray,
    VM_getMethodHandleTableEntryIndex,
+   VM_getLayoutVarHandle,
 
    // For static TR::CompilationInfo methods
    CompInfo_isCompiled,