TransformIndirectLoadChain at JITServer

runtime/compiler/control/JITClientCompilationThread.cpp

@@ -2958,6 +2958,52 @@ handleServerMessage(JITServer::ClientStream *client, TR_J9VM *fe, JITServer::Mes
          client->write(response, vectorBitSize);
          }
          break;
+      case MessageType::KnownObjectTable_addFieldAddressFromBaseIndex:
+         {
+         auto recv = client->getRecvData<TR::KnownObjectTable::Index, intptr_t, bool>();
+         TR::KnownObjectTable::Index baseObjectIndex = std::get<0>(recv);
+         intptr_t fieldOffset = std::get<1>(recv);
+         bool isArrayWithConstantElements = std::get<2>(recv);
+
+         TR::KnownObjectTable::Index resultIndex = TR::KnownObjectTable::UNKNOWN;
+
+            {
+            TR::VMAccessCriticalSection addFieldAddressFromBaseIndex(fe);
+            uintptr_t baseObjectAddress = knot->getPointer(baseObjectIndex);
+            uintptr_t fieldAddress = baseObjectAddress + fieldOffset;
+
+            uintptr_t objectPointer = fe->getReferenceFieldAtAddress(fieldAddress);
+
+            if (objectPointer)
+               resultIndex = knot->getOrCreateIndexAt(&objectPointer, isArrayWithConstantElements);
+            }
+
+         uintptr_t *resultPointer = (resultIndex == TR::KnownObjectTable::UNKNOWN) ?
+               NULL : knot->getPointerLocation(resultIndex);
+
+         client->write(response, resultIndex, resultPointer);
+         }
+         break;
+      case MessageType::KnownObjectTable_getFieldAddressData:
+         {
+         auto recv = client->getRecvData<TR::KnownObjectTable::Index, intptr_t>();
+         TR::KnownObjectTable::Index baseObjectIndex = std::get<0>(recv);
+         intptr_t fieldOffset = std::get<1>(recv);
+
+         J9::TransformUtil::value data;
+
+            {
+            TR::VMAccessCriticalSection addFieldAddressFromBaseIndex(fe);
+            uintptr_t baseObjectAddress = knot->getPointer(baseObjectIndex);
+
+            uintptr_t fieldAddress = baseObjectAddress + fieldOffset;
+
+            data = *(J9::TransformUtil::value *) fieldAddress;
+            }
+
+         client->write(response, data);
+         }
+         break;
       case MessageType::AOTCache_getROMClassBatch:
          {
          auto recv = client->getRecvData<std::vector<J9Class *>>();

runtime/compiler/env/J9KnownObjectTable.cpp

@@ -230,7 +230,7 @@ J9::KnownObjectTable::getPointerLocation(Index index)
 
 #if defined(J9VM_OPT_JITSERVER)
 void
-J9::KnownObjectTable::updateKnownObjectTableAtServer(Index index, uintptr_t *objectReferenceLocationClient)
+J9::KnownObjectTable::updateKnownObjectTableAtServer(Index index, uintptr_t *objectReferenceLocationClient, bool isArrayWithConstantElements)
    {
    TR_ASSERT_FATAL(self()->comp()->isOutOfProcessCompilation(), "updateKnownObjectTableAtServer should only be called at the server");
    if (index == TR::KnownObjectTable::UNKNOWN)
@@ -256,6 +256,9 @@ J9::KnownObjectTable::updateKnownObjectTableAtServer(Index index, uintptr_t *obj
       {
       TR_ASSERT_FATAL(false, "index %d from the client is greater than the KOT nextIndex %d at the server", index, nextIndex);
       }
+
+   if (isArrayWithConstantElements)
+      addArrayWithConstantElements(index);
    }
 #endif /* defined(J9VM_OPT_JITSERVER) */
 

runtime/compiler/env/J9KnownObjectTable.hpp

@@ -107,7 +107,7 @@ class OMR_EXTENSIBLE KnownObjectTable : public OMR::KnownObjectTableConnector
    uintptr_t getPointer(Index index);
 
 #if defined(J9VM_OPT_JITSERVER)
-   void updateKnownObjectTableAtServer(Index index, uintptr_t *objectReferenceLocationClient);
+   void updateKnownObjectTableAtServer(Index index, uintptr_t *objectReferenceLocationClient, bool isArrayWithConstantElements = false);
    void getKnownObjectTableDumpInfo(std::vector<TR_KnownObjectTableDumpInfo> &knotDumpInfoList);
 #endif /* defined(J9VM_OPT_JITSERVER) */
 

runtime/compiler/env/VMJ9Server.hpp

@@ -210,7 +210,8 @@ class TR_J9ServerVM: public TR_J9VM
    virtual intptr_t getVFTEntry(TR_OpaqueClassBlock *clazz, int32_t offset) override;
    virtual bool isClassArray(TR_OpaqueClassBlock *klass) override;
    virtual uintptr_t getFieldOffset(TR::Compilation * comp, TR::SymbolReference* classRef, TR::SymbolReference* fieldRef) override { return 0; } // safe answer
-   virtual bool canDereferenceAtCompileTime(TR::SymbolReference *fieldRef,  TR::Compilation *comp) override { return false; } // safe answer, might change in the future
+// The base version should be safe, no need to override.
+//   virtual bool canDereferenceAtCompileTime(TR::SymbolReference *fieldRef,  TR::Compilation *comp) override; // safe answer, might change in the future
    virtual bool instanceOfOrCheckCast(J9Class *instanceClass, J9Class* castClass) override;
    virtual bool instanceOfOrCheckCastNoCacheUpdate(J9Class *instanceClass, J9Class* castClass) override;
    virtual bool transformJlrMethodInvoke(J9Method *callerMethod, J9Class *callerClass) override;

runtime/compiler/net/CommunicationStream.hpp

@@ -129,7 +129,7 @@ class CommunicationStream
    // likely to lose an increment when merging/rebasing/etc.
    //
    static const uint8_t MAJOR_NUMBER = 1;
-   static const uint16_t MINOR_NUMBER = 75; // ID: kzkyjklaOnYjEzzJyIl7
+   static const uint16_t MINOR_NUMBER = 76; // ID: BpR0Syhau116Bh0vAoVr
    static const uint8_t PATCH_NUMBER = 0;
    static uint32_t CONFIGURATION_FLAGS;
 

runtime/compiler/net/MessageTypes.cpp

@@ -263,6 +263,8 @@ const char *messageNames[] =
    "KnownObjectTable_getKnownObjectTableDumpInfo",
    "KnownObjectTable_getOpaqueClass",
    "KnownObjectTable_getVectorBitSize",
+   "KnownObjectTable_addFieldAddressFromBaseIndex",
+   "KnownObjectTable_getFieldAddressData",
    "AOTCache_getROMClassBatch",
    "AOTCacheMap_request",
    "AOTCacheMap_reply"

runtime/compiler/net/MessageTypes.hpp

@@ -290,6 +290,9 @@ enum MessageType : uint16_t
    KnownObjectTable_getOpaqueClass,
    // for getting a vectorBitSize from KnownObjectTable
    KnownObjectTable_getVectorBitSize,
+   // used with J9TransformUtil
+   KnownObjectTable_addFieldAddressFromBaseIndex,
+   KnownObjectTable_getFieldAddressData,
 
    AOTCache_getROMClassBatch,