C++ Node::setChild方法代码示例

TR::Node *TR_OutlinedInstructions::createOutlinedCallNode(TR::Node *callNode, TR::ILOpCodes callOp)
   {
   int32_t   i;
   TR::Node  *child;

   //We pass true for getSymbolReference because
   TR::Node *newCallNode = TR::Node::createWithSymRef(callNode, callOp, callNode->getNumChildren(), callNode->getSymbolReference());

   newCallNode->setReferenceCount(1);

   for (i=0; i<callNode->getNumChildren(); i++)
      {
      child = callNode->getChild(i);

      if (child->getRegister() != NULL)
         {
         // Child has already been evaluated outside this tree.
         //
         newCallNode->setAndIncChild(i, child);
         }
      else if (child->getOpCode().isLoadConst())
         {
         // Copy unevaluated constant nodes.
         //
         child = TR::Node::copy(child);
         child->setReferenceCount(1);
         newCallNode->setChild(i, child);
         }
      else
         {
         if ((child->getOpCodeValue() == TR::loadaddr) &&
             /*(callNode->getOpCodeValue() == TR::instanceof || callNode->getOpCodeValue() == TR::checkcast || callNode->getOpCodeValue() == TR::checkcastAndNULLCHK || callNode->getOpCodeValue() == TR::New || callNode->getOpCodeValue() == TR::anewarray)    &&*/
             (child->getSymbolReference()->getSymbol()) &&
             (child->getSymbolReference()->getSymbol()->getStaticSymbol()))
            {
            child = TR::Node::copy(child);
            child->setReferenceCount(1);
            newCallNode->setChild(i, child);
            }
         else
            {
            // Be very conservative at this point, even though it is possible to make it less so.  For example, this will catch
            // the case of an unevaluated argument not persisting outside of the outlined region even though one of its subtrees will.
            //
            (void)_cg->evaluate(child);

            // Do not decrement the reference count here.  It will be decremented when the call node is evaluated
            // again in the helper instruction stream.
            //
            newCallNode->setAndIncChild(i, child);
            }
         }
      }
   if(callNode->isPreparedForDirectJNI())
      {
         newCallNode->setPreparedForDirectJNI();
      }

   return newCallNode;
   }

void
TR::RegDepCopyRemoval::makeFreshCopy(TR_GlobalRegisterNumber reg)
   {
   RegDepInfo &dep = getRegDepInfo(reg);
   if (!performTransformation(comp(),
         "%schange %s in GlRegDeps n%un to an explicit copy of n%un\n",
         optDetailString(),
         registerName(reg),
         _regDeps->getGlobalIndex(),
         dep.value->getGlobalIndex()))
      return;

   // Split the block at fallthrough if necessary to avoid putting copies
   // between branches and BBEnd.
   TR::Node *curNode = _treetop->getNode();
   if (curNode->getOpCodeValue() == TR::BBEnd)
      {
      TR::Block *curBlock = curNode->getBlock();
      if (curBlock->getLastRealTreeTop() != curBlock->getLastNonControlFlowTreeTop())
         {
         TR::Block *fallthrough = curBlock->getNextBlock();
         fallthrough = curBlock->splitEdge(curBlock, fallthrough, comp());
         TR_ASSERT(curBlock->getNextBlock() == fallthrough, "bad block placement from splitEdge\n");
         fallthrough->setIsExtensionOfPreviousBlock();
         _treetop = fallthrough->getExit();
         TR::Node *newNode = _treetop->getNode();
         newNode->setChild(0, _regDeps);
         newNode->setNumChildren(1);
         curNode->setNumChildren(0);
         if (trace())
            traceMsg(comp(), "\tsplit fallthrough edge to insert copy, created block_%d\n", fallthrough->getNumber());
         }
      }

   // Make and insert the copy
   TR::Node *copyNode = NULL;
   if (dep.value->getOpCode().isLoadConst())
      {
      // No need to depend on the other register.
      // TODO heuristic for whether this is really better than a reg-reg move?
      generateRegcopyDebugCounter("const-remat");
      copyNode = TR::Node::create(dep.value->getOpCodeValue(), 0);
      copyNode->setConstValue(dep.value->getConstValue());
      }
   else
      {
      generateRegcopyDebugCounter("fresh-copy");
      copyNode = TR::Node::create(TR::PassThrough, 1, dep.value);
      copyNode->setCopyToNewVirtualRegister();
      }

   TR::Node *copyTreetopNode = TR::Node::create(TR::treetop, 1, copyNode);
   _treetop->insertBefore(TR::TreeTop::create(comp(), copyTreetopNode));
   if (trace())
      traceMsg(comp(), "\tcopy is n%un\n", copyNode->getGlobalIndex());

   updateSingleRegDep(reg, copyNode);
   }

//.........这里部分代码省略.........
                  requestOpt(OMR::treeSimplification, true, block);

               if (nextTree->getNode()->getOpCodeValue() == TR::Goto
                   && prevTree->getNode()->getOpCodeValue() == TR::BBStart
                   && !prevTree->getNode()->getBlock()->isExtensionOfPreviousBlock())
                  {
                  requestOpt(
                     OMR::redundantGotoElimination,
                     prevTree->getNode()->getBlock());
                  }
               }
            }
         else
            {
            if (performTransformation(comp(), "%sMove tree : [" POINTER_PRINTF_FORMAT "]([" POINTER_PRINTF_FORMAT "] = %s) to end of block\n", optDetailString(), node, node->getFirstChild(), node->getFirstChild()->getOpCode().getName()))
               {
               prevTree->join(nextTree);
               node->setVisitCount(visitCount);

               TR::TreeTop *lastTree = findLastTreetop(block, prevTree);
               TR::TreeTop *prevLastTree = lastTree->getPrevTreeTop();

               TR::TreeTop *cursorTreeTop = nextTree;
               while (cursorTreeTop != lastTree)
                  {
                  if (cursorTreeTop->getNode()->getOpCode().isStoreReg() &&
                      (cursorTreeTop->getNode()->getGlobalRegisterNumber() == iter.currentTree()->getNode()->getGlobalRegisterNumber()))
                     {
                     lastTree = cursorTreeTop;
                     prevLastTree = lastTree->getPrevTreeTop();
                     break;
                     }

                  cursorTreeTop = cursorTreeTop->getNextTreeTop();
                  }

               if (lastTree->getNode()->getOpCodeValue() == TR::BBStart)
                  {
                  prevLastTree = lastTree;
                  lastTree = block->getExit();
                  }

               TR::Node *lastNode = lastTree->getNode();
               TR::Node *prevLastNode = prevLastTree->getNode();

               if (lastNode->getOpCode().isIf() && !lastNode->getOpCode().isCompBranchOnly() &&
                   prevLastNode->getOpCode().isStoreReg() &&
                   ((prevLastNode->getFirstChild() == lastNode->getFirstChild()) ||
                    (prevLastNode->getFirstChild() == lastNode->getSecondChild())))
                  {
                  lastTree = prevLastTree;
                  prevLastTree = lastTree->getPrevTreeTop();
                  }

               prevLastTree->join(iter.currentTree());
               iter.currentTree()->join(lastTree);

               iter.jumpTo(prevTree);
               requestOpt(OMR::treeSimplification, true, block);
               }
            }
         }
      }

   for (auto it = anchors.begin(); it != anchors.end(); ++it)
      {
      TR::Node *anchor = it->tree->getNode();
      TR::Node *load = anchor->getChild(0);
      if (load->getReferenceCount() > 1)
         continue;

      // We can eliminate the indirect load immediately, but for the moment the
      // subtree providing the base object has to be anchored.

      TR::Node *heapBase = anchor->getChild(1);

      TR::Node::recreate(anchor, TR::treetop);
      anchor->setAndIncChild(0, load->getChild(0));
      anchor->setChild(1, NULL);
      anchor->setNumChildren(1);

      if (!heapBase->getOpCode().isLoadConst())
         {
         it->tree->insertAfter(
            TR::TreeTop::create(
               comp(),
               TR::Node::create(heapBase, TR::treetop, 1, heapBase)));
         }

      load->recursivelyDecReferenceCount();
      heapBase->recursivelyDecReferenceCount();

      // A later pass of dead trees can likely move (or even remove) the base
      // object expression.

      requestOpt(OMR::deadTreesElimination, true, it->block);
      }

   return 1; // actual cost
   }