C++ tr::ParameterSymbol类代码示例

void
ResolvedMethod::makeParameterList(TR::ResolvedMethodSymbol *methodSym)
   {
   ListAppender<TR::ParameterSymbol> la(&methodSym->getParameterList());
   TR::ParameterSymbol *parmSymbol;
   int32_t slot = 0;
   int32_t ordinal = 0;

   uint32_t parmSlots = numberOfParameterSlots();
   for (int32_t parmIndex = 0; parmIndex < parmSlots; ++parmIndex)
      {
      TR::IlType *type = _parmTypes[parmIndex];
      TR::DataType dt = type->getPrimitiveType();
      int32_t size = methodSym->convertTypeToSize(dt);

      parmSymbol = methodSym->comp()->getSymRefTab()->createParameterSymbol(methodSym, slot, type->getPrimitiveType(), false);
      parmSymbol->setOrdinal(ordinal++);

      char *s = type->getSignatureName();
      uint32_t len = strlen(s);
      parmSymbol->setTypeSignature(s, len);

      la.add(parmSymbol);

      ++slot;
      }

   int32_t lastInterpreterSlot = slot + numberOfTemps();
   methodSym->setTempIndex(lastInterpreterSlot, methodSym->comp()->fe());
   methodSym->setFirstJitTempIndex(methodSym->getTempIndex());
   }

bool
OMR::SymbolReference::isThisPointer()
   {
   TR::Compilation *c = TR::comp();
   TR::ParameterSymbol* p = _symbol->getParmSymbol();
   return p && p->getSlot() == 0
      && !self()->getOwningMethod(c)->isStatic();
   }

TR::KnownObjectTable::Index
OMR::SymbolReference::getKnownObjectIndex()
   {
   if (self()->getSymbol())
      {
      TR::ParameterSymbol *parm = self()->getSymbol()->getParmSymbol();
      if (parm && parm->hasKnownObjectIndex())
         {
         if (_knownObjectIndex != TR::KnownObjectTable::UNKNOWN)
            TR_ASSERT(self()->getKnownObjectIndex() == parm->getKnownObjectIndex(), "Parm symbol and symref known-object indexes must match (%d != %d)", self()->getKnownObjectIndex(), parm->getKnownObjectIndex());
         return parm->getKnownObjectIndex();
         }
      }
   return _knownObjectIndex;
   }

void
TR::AMD64ABILinkage::mapIncomingParms(
      TR::ResolvedMethodSymbol *method,
      uint32_t &stackIndex)
   {
   ListIterator<TR::ParameterSymbol> parameterIterator(&method->getParameterList());
   TR::ParameterSymbol *parmCursor = parameterIterator.getFirst();

   if (!parmCursor) return;

   if (parmCursor->getLinkageRegisterIndex() < 0)
      {
      copyLinkageInfoToParameterSymbols();
      }

   // 1st: handle parameters which are passed through stack
   //
   TR::X86SystemLinkage::mapIncomingParms(method);

   // 2nd: handle parameters which are passed through linkage registers, but are
   // not assigned any register after RA (or say, by their first usage point,
   // a MOV is needed to load it from stack to register).
   //
   // AMD64 SysV ABI says that: a parameter is placed either in registers or
   // pushed on the stack, but can't take both.  So, for parms passed through
   // linkage registers but don't have physical registers assigned after RA,
   // we will allocate stack space in local variable region.
   //
   for (parmCursor = parameterIterator.getFirst(); parmCursor; parmCursor = parameterIterator.getNext())
      {
      if ((parmCursor->getLinkageRegisterIndex() >= 0) && (parmCursor->getAllocatedIndex() < 0 || hasToBeOnStack(parmCursor)))
         {
         uint32_t align = getAlignment(parmCursor->getDataType());
         uint32_t alignMinus1 = (align <= AMD64_STACK_SLOT_SIZE) ? (AMD64_STACK_SLOT_SIZE - 1) : (align - 1);
         uint32_t pos = -stackIndex;
         pos += parmCursor->getSize();
         pos = (pos + alignMinus1) & (~alignMinus1);
         stackIndex = -pos;
         parmCursor->setParameterOffset(stackIndex);

         if (comp()->getOption(TR_TraceCG))
            traceMsg(comp(), "mapIncomingParms setParameterOffset %d for param symbol (reg param without home location) %p, hasToBeOnStack() %d\n", parmCursor->getParameterOffset(), parmCursor, hasToBeOnStack(parmCursor));
         }
      else if (parmCursor->getLinkageRegisterIndex() >=0 && parmCursor->getAllocatedIndex() >= 0)
         {
         //parmCursor->setDontHaveStackSlot(0); // this is a hack , so as we could print stack layout table in createPrologue
         if (comp()->getOption(TR_TraceCG))
            traceMsg(comp(), "mapIncomingParms no need to set parm %p, for it has got register %d assigned\n", parmCursor, parmCursor->getAllocatedIndex());
         }
      }
   }

// Copies parameters from where they enter the method (either on stack or in a
// linkage register) to their "home location" where the method body will expect
// to find them (either on stack or in a global register).
//
TR::Instruction *
TR::X86SystemLinkage::copyParametersToHomeLocation(TR::Instruction *cursor)
   {
   TR::Machine *machine = cg()->machine();
   TR::RealRegister *framePointer = machine->getX86RealRegister(TR::RealRegister::vfp);

   TR::ResolvedMethodSymbol             *bodySymbol = comp()->getJittedMethodSymbol();
   ListIterator<TR::ParameterSymbol>  paramIterator(&(bodySymbol->getParameterList()));
   TR::ParameterSymbol               *paramCursor;

   const TR::RealRegister::RegNum noReg = TR::RealRegister::NoReg;
   TR_ASSERT(noReg == 0, "noReg must be zero so zero-initializing movStatus will work");

   TR::MovStatus movStatus[TR::RealRegister::NumRegisters] = {{(TR::RealRegister::RegNum)0,(TR::RealRegister::RegNum)0,(TR_MovDataTypes)0}};

   // We must always do the stores first, then the reg-reg copies, then the
   // loads, so that we never clobber a register we will need later.  However,
   // the logic is simpler if we do the loads and stores in the same loop.
   // Therefore, we maintain a separate instruction cursor for the loads.
   //
   // We defer the initialization of loadCursor until we generate the first
   // load.  Otherwise, if we happen to generate some stores first, then the
   // store cursor would get ahead of the loadCursor, and the instructions
   // would end up in the wrong order despite our efforts.
   //
   TR::Instruction *loadCursor = NULL;

   // Phase 1: generate RegMem and MemReg movs, and collect information about
   // the required RegReg movs.
   //
   for (paramCursor = paramIterator.getFirst();
       paramCursor != NULL;
       paramCursor = paramIterator.getNext())
      {
      int8_t lri = paramCursor->getLinkageRegisterIndex();     // How the parameter enters the method
      TR::RealRegister::RegNum ai                              // Where method body expects to find it
         = (TR::RealRegister::RegNum)paramCursor->getAllocatedIndex();
      int32_t offset = paramCursor->getParameterOffset();      // Location of the parameter's stack slot
      TR_MovDataTypes movDataType = paramMovType(paramCursor); // What sort of MOV instruction does it need?

      // Copy the parameter to wherever it should be
      //
      if (lri == NOT_LINKAGE) // It's on the stack
         {
         if (ai == NOT_ASSIGNED) // It only needs to be on the stack
            {
            // Nothing to do
            }
         else // Method body expects it to be in the ai register
            {
            if (loadCursor == NULL)
               loadCursor = cursor;

            if (debug("traceCopyParametersToHomeLocation"))
               diagnostic("copyParametersToHomeLocation: Loading %d\n", ai);
            // ai := stack
            loadCursor = generateRegMemInstruction(
               loadCursor,
               TR::Linkage::movOpcodes(RegMem, movDataType),
               machine->getX86RealRegister(ai),
               generateX86MemoryReference(framePointer, offset, cg()),
               cg()
               );
            }
         }
      else // It's in a linkage register
         {
         TR::RealRegister::RegNum sourceIndex = getProperties().getArgumentRegister(lri, isFloat(movDataType));

         // Copy to the stack if necessary
         //
         if (ai == NOT_ASSIGNED || hasToBeOnStack(paramCursor))
            {
            if (comp()->getOption(TR_TraceCG))
              traceMsg(comp(), "copyToHomeLocation param %p, linkage reg index %d, allocated index %d, parameter offset %d, hasToBeOnStack %d, parm->isParmHasToBeOnStack() %d.\n", paramCursor, lri, ai, offset, hasToBeOnStack(paramCursor), paramCursor->isParmHasToBeOnStack());
            if (debug("traceCopyParametersToHomeLocation"))
               diagnostic("copyParametersToHomeLocation: Storing %d\n", sourceIndex);
            // stack := lri
            cursor = generateMemRegInstruction(
               cursor,
               TR::Linkage::movOpcodes(MemReg, movDataType),
               generateX86MemoryReference(framePointer, offset, cg()),
               machine->getX86RealRegister(sourceIndex),
               cg()
               );
            }

         // Copy to the ai register if necessary
         //
         if (ai != NOT_ASSIGNED && ai != sourceIndex)
            {
            // This parameter needs a RegReg move.  We don't know yet whether
            // we need the value in the target register, so for now we just
            // remember that we need to do this and keep going.
            //
            TR_ASSERT(movStatus[ai         ].sourceReg == noReg, "Each target reg must have only one source");
//.........这里部分代码省略.........

void
TR::ARM64SystemLinkage::createPrologue(TR::Instruction *cursor, List<TR::ParameterSymbol> &parmList)
   {
   TR::CodeGenerator *codeGen = cg();
   TR::Machine *machine = codeGen->machine();
   TR::ResolvedMethodSymbol *bodySymbol = comp()->getJittedMethodSymbol();
   const TR::ARM64LinkageProperties& properties = getProperties();
   TR::RealRegister *sp = machine->getRealRegister(properties.getStackPointerRegister());
   TR::Node *firstNode = comp()->getStartTree()->getNode();

   // allocate stack space
   uint32_t frameSize = (uint32_t)codeGen->getFrameSizeInBytes();
   if (constantIsUnsignedImm12(frameSize))
      {
      cursor = generateTrg1Src1ImmInstruction(codeGen, TR::InstOpCode::subimmx, firstNode, sp, sp, frameSize, cursor);
      }
   else
      {
      TR_UNIMPLEMENTED();
      }

   // save link register (x30)
   if (machine->getLinkRegisterKilled())
      {
      TR::MemoryReference *stackSlot = new (trHeapMemory()) TR::MemoryReference(sp, 0, codeGen);
      cursor = generateMemSrc1Instruction(cg(), TR::InstOpCode::strimmx, firstNode, stackSlot, machine->getRealRegister(TR::RealRegister::x30), cursor);
      }

   // spill argument registers
   int32_t nextIntArgReg = 0;
   int32_t nextFltArgReg = 0;
   ListIterator<TR::ParameterSymbol> parameterIterator(&parmList);
   for (TR::ParameterSymbol *parameter = parameterIterator.getFirst();
        parameter != NULL && (nextIntArgReg < getProperties().getNumIntArgRegs() || nextFltArgReg < getProperties().getNumFloatArgRegs());
        parameter = parameterIterator.getNext())
      {
      TR::MemoryReference *stackSlot = new (trHeapMemory()) TR::MemoryReference(sp, parameter->getParameterOffset(), codeGen);
      TR::InstOpCode::Mnemonic op;

      switch (parameter->getDataType())
         {
         case TR::Int8:
         case TR::Int16:
         case TR::Int32:
         case TR::Int64:
         case TR::Address:
            if (nextIntArgReg < getProperties().getNumIntArgRegs())
               {
               op = (parameter->getSize() == 8) ? TR::InstOpCode::strimmx : TR::InstOpCode::strimmw;
               cursor = generateMemSrc1Instruction(cg(), op, firstNode, stackSlot, machine->getRealRegister((TR::RealRegister::RegNum)(TR::RealRegister::x0 + nextIntArgReg)), cursor);
               nextIntArgReg++;
               }
            else
               {
               nextIntArgReg = getProperties().getNumIntArgRegs() + 1;
               }
            break;
         case TR::Float:
         case TR::Double:
            if (nextFltArgReg < getProperties().getNumFloatArgRegs())
               {
               op = (parameter->getSize() == 8) ? TR::InstOpCode::vstrimmd : TR::InstOpCode::vstrimms;
               cursor = generateMemSrc1Instruction(cg(), op, firstNode, stackSlot, machine->getRealRegister((TR::RealRegister::RegNum)(TR::RealRegister::v0 + nextFltArgReg)), cursor);
               nextFltArgReg++;
               }
            else
               {
               nextFltArgReg = getProperties().getNumFloatArgRegs() + 1;
               }
            break;
         case TR::Aggregate:
            TR_ASSERT(false, "Function parameters of aggregate types are not currently supported on AArch64.");
            break;
         default:
            TR_ASSERT(false, "Unknown parameter type.");
         }
      }

   // save callee-saved registers
   uint32_t offset = bodySymbol->getLocalMappingCursor();
   for (int r = TR::RealRegister::x19; r <= TR::RealRegister::x28; r++)
      {
      TR::RealRegister *rr = machine->getRealRegister((TR::RealRegister::RegNum)r);
      if (rr->getHasBeenAssignedInMethod())
         {
         TR::MemoryReference *stackSlot = new (trHeapMemory()) TR::MemoryReference(sp, offset, codeGen);
         cursor = generateMemSrc1Instruction(cg(), TR::InstOpCode::strimmx, firstNode, stackSlot, rr, cursor);
         offset += 8;
         }
      }
   for (int r = TR::RealRegister::v8; r <= TR::RealRegister::v15; r++)
      {
      TR::RealRegister *rr = machine->getRealRegister((TR::RealRegister::RegNum)r);
      if (rr->getHasBeenAssignedInMethod())
         {
         TR::MemoryReference *stackSlot = new (trHeapMemory()) TR::MemoryReference(sp, offset, codeGen);
         cursor = generateMemSrc1Instruction(cg(), TR::InstOpCode::vstrimmd, firstNode, stackSlot, rr, cursor);
         offset += 8;
         }
      }
//.........这里部分代码省略.........

void TR::ARMSystemLinkage::createPrologue(TR::Instruction *cursor)
   {
   TR::CodeGenerator *codeGen = cg();
   const TR::ARMLinkageProperties& properties = getProperties();
   TR::Machine *machine = codeGen->machine();
   TR::ResolvedMethodSymbol* bodySymbol = comp()->getJittedMethodSymbol();
   TR::Node *firstNode = comp()->getStartTree()->getNode();
   TR::RealRegister *stackPtr = machine->getRealRegister(properties.getStackPointerRegister());

   // Entry breakpoint
   //
   if (comp()->getOption(TR_EntryBreakPoints))
      {
      cursor = new (trHeapMemory()) TR::Instruction(cursor, ARMOp_bad, firstNode, cg());
      }

   // allocate stack space
   auto frameSize = codeGen->getFrameSizeInBytes();
   cursor = generateTrg1Src1ImmInstruction(codeGen, ARMOp_sub, firstNode, stackPtr, stackPtr, frameSize, 0, cursor);

   // spill argument registers
   auto nextIntArgReg = 0;
   auto nextFltArgReg = 0;
   ListIterator<TR::ParameterSymbol> parameterIterator(&bodySymbol->getParameterList());
   for (TR::ParameterSymbol *parameter = parameterIterator.getFirst();
        parameter!=NULL && (nextIntArgReg < getProperties().getNumIntArgRegs() || nextFltArgReg < getProperties().getNumFloatArgRegs());
        parameter=parameterIterator.getNext())
      {
      auto *stackSlot = new (trHeapMemory()) TR::MemoryReference(stackPtr, parameter->getParameterOffset(), codeGen);
      switch (parameter->getDataType())
         {
         case TR::Int8:
         case TR::Int16:
         case TR::Int32:
         case TR::Address:
            if (nextIntArgReg < getProperties().getNumIntArgRegs())
               {
               cursor = generateMemSrc1Instruction(cg(), ARMOp_str, firstNode, stackSlot, machine->getRealRegister((TR::RealRegister::RegNum)(TR::RealRegister::gr0 + nextIntArgReg)), cursor);
               nextIntArgReg++;
               }
            else
               {
               nextIntArgReg = getProperties().getNumIntArgRegs() + 1;
               }
            break;
         case TR::Int64:
            nextIntArgReg += nextIntArgReg & 0x1; // round to next even number
            if (nextIntArgReg + 1 < getProperties().getNumIntArgRegs())
               {
               cursor = generateMemSrc1Instruction(cg(), ARMOp_str, firstNode, stackSlot, machine->getRealRegister((TR::RealRegister::RegNum)(TR::RealRegister::gr0 + nextIntArgReg)), cursor);
               stackSlot = new (trHeapMemory()) TR::MemoryReference(stackPtr, parameter->getParameterOffset() + 4, codeGen);
               cursor = generateMemSrc1Instruction(cg(), ARMOp_str, firstNode, stackSlot, machine->getRealRegister((TR::RealRegister::RegNum)(TR::RealRegister::gr0 + nextIntArgReg + 1)), cursor);
               nextIntArgReg += 2;
               }
            else
               {
               nextIntArgReg = getProperties().getNumIntArgRegs() + 1;
               }
            break;
         case TR::Float:
            comp()->failCompilation<UnsupportedParameterType>("Compiling methods with a single precision floating point parameter is not supported");
            break;
         case TR::Double:
            if (nextFltArgReg < getProperties().getNumFloatArgRegs())
               {
               cursor = generateMemSrc1Instruction(cg(), ARMOp_fstd, firstNode, stackSlot, machine->getRealRegister((TR::RealRegister::RegNum)(TR::RealRegister::fp0 + nextFltArgReg)), cursor);
               nextFltArgReg += 1;
               }
            else
               {
               nextFltArgReg = getProperties().getNumFloatArgRegs() + 1;
               }
            break;
         case TR::Aggregate:
            TR_ASSERT(false, "Function parameters of aggregate types are not currently supported on ARM.");
         }
      }

   // save all preserved registers
   for (int r = TR::RealRegister::gr4; r <= TR::RealRegister::gr11; ++r)
      {
      auto *stackSlot = new (trHeapMemory()) TR::MemoryReference(stackPtr, (TR::RealRegister::gr11 - r + 1)*4 + bodySymbol->getLocalMappingCursor(), codeGen);
      cursor = generateMemSrc1Instruction(cg(), ARMOp_str, firstNode, stackSlot, machine->getRealRegister((TR::RealRegister::RegNum)r), cursor);
      }

   // save link register (r14)
   auto *stackSlot = new (trHeapMemory()) TR::MemoryReference(stackPtr, bodySymbol->getLocalMappingCursor(), codeGen);
   cursor = generateMemSrc1Instruction(cg(), ARMOp_str, firstNode, stackSlot, machine->getRealRegister(TR::RealRegister::gr14), cursor);
   }

/**
 * @brief Maps symbols in the IL to locations on the stack
 * @param method is the method for which symbols are being stack mapped
 *
 * In general, the shape of a stack frame is as follows:
 *
 * +-----------------------------+
 * | caller frame                |
 * +-----------------------------+
 * | stack arguments             |
 * +=============================+ <-+ (start of callee frame)
 * | saved registers             |   |
 * +-----------------------------+   | frame size
 * | locals                      |   |
 * +-----------------------------+ <-+- $sp
 *
 * A symbol is mapped onto the stack by assigning to it an offset from the stack
 * pointer. All symbols representing stack allocated values must be mapped,
 * including automatics (locals) on the callee frame and stack allocated
 * arguments on the caller frame
 *
 * The algorithm used to map symbols iterates over each symbol in ascending
 * address order. Using the frame shape depicted above as a general example:
 * locals are mapped first, registers second. The algorithm is:
 *
 * 1. Set stackIndex to 0
 * 2. For each symbol that must be mapped onto the **callee** stack frame,
 *    starting at the lowest address:
 *       a. set stackIndex as the symbol offset
 *       b. increment stackIndex by the size of the symbol's type
 *          plus alignment requirements
 * 3. Increment stackIndex by the necessary amount to account for the stack
 *    space required for saved registers
 * 4. Save stackIndex as the size of the callee stack frame
 * 5. For each symbol that must be mapped onto the **caller** stack frame,
 *    starting at the lowest address:
 *       a. set the symbol offset as the current stack index
 *       b. increment the stack index by the size of the symbol's type,
 *          plus alignment requirements
 */
void TR::ARMSystemLinkage::mapStack(TR::ResolvedMethodSymbol *method)
   {
   uint32_t stackIndex = 0;
   ListIterator<TR::AutomaticSymbol> automaticIterator(&method->getAutomaticList());
   TR::AutomaticSymbol *localCursor = automaticIterator.getFirst();

   // map non-double automatics
   while (localCursor != NULL)
      {
      if (localCursor->getGCMapIndex() < 0 &&
          localCursor->getDataType() != TR::Double)
         {
         localCursor->setOffset(stackIndex);
         stackIndex += (localCursor->getSize()+3)&(~3);
         }
      localCursor = automaticIterator.getNext();
      }

   stackIndex += (stackIndex & 0x4) ? 4 : 0; // align to 8 bytes
   automaticIterator.reset();
   localCursor = automaticIterator.getFirst();

   // map double automatics
   while (localCursor != NULL)
      {
      if (localCursor->getDataType() == TR::Double)
         {
         localCursor->setOffset(stackIndex);
         stackIndex += (localCursor->getSize()+7)&(~7);
         }
      localCursor = automaticIterator.getNext();
      }
   method->setLocalMappingCursor(stackIndex);

   // allocate space for preserved registers and link register (9 registers total)
   stackIndex += 9*4;

   /*
    * Because the rest of the code generator currently expects **all** arguments
    * to be passed on the stack, arguments passed in registers must be spilled
    * in the callee frame. To map the arguments correctly, we use two loops. The
    * first maps the arguments that will come in registers onto the callee stack.
    * At the end of this loop, the `stackIndex` is the the size of the frame.
    * The second loop then maps the remaining arguments onto the caller frame.
    */

   auto nextIntArgReg = 0;
   auto nextFltArgReg = 0;

   ListIterator<TR::ParameterSymbol> parameterIterator(&method->getParameterList());
   for (TR::ParameterSymbol *parameter = parameterIterator.getFirst();
        parameter!=NULL && (nextIntArgReg < getProperties().getNumIntArgRegs() || nextFltArgReg < getProperties().getNumFloatArgRegs());
        parameter=parameterIterator.getNext())
      {
      switch (parameter->getDataType())
         {
         case TR::Int8:
         case TR::Int16:
         case TR::Int32:
         case TR::Address:
//.........这里部分代码省略.........

TR::Instruction *OMR::Power::Linkage::flushArguments(TR::Instruction *cursor)
   {
   TR::Machine *machine = self()->machine();
   TR::RealRegister      *stackPtr   = self()->cg()->getStackPointerRegister();
   TR::ResolvedMethodSymbol      *bodySymbol = self()->comp()->getJittedMethodSymbol();
   ListIterator<TR::ParameterSymbol>   paramIterator(&(bodySymbol->getParameterList()));
   TR::ParameterSymbol      *paramCursor = paramIterator.getFirst();
   TR::Node                 *firstNode = self()->comp()->getStartTree()->getNode();
   int32_t                  numIntArgs = 0, numFloatArgs = 0;
   const TR::PPCLinkageProperties& properties = self()->getProperties();

   while ( (paramCursor!=NULL) &&
           ( (numIntArgs < properties.getNumIntArgRegs()) ||
             (numFloatArgs < properties.getNumFloatArgRegs()) ) )
      {
      TR::RealRegister     *argRegister;
      int32_t                 offset = paramCursor->getParameterOffset();

      // If parm is referenced or required to be on stack (i.e. FSD), we have to flush.
      bool hasToStoreToStack = paramCursor->isReferencedParameter() || paramCursor->isParmHasToBeOnStack();

      switch (paramCursor->getDataType())
         {
         case TR::Int8:
         case TR::Int16:
         case TR::Int32:
            if (hasToStoreToStack &&
                  numIntArgs<properties.getNumIntArgRegs())
               {
               argRegister = machine->getRealRegister(properties.getIntegerArgumentRegister(numIntArgs));
               cursor = generateMemSrc1Instruction(self()->cg(), TR::InstOpCode::stw, firstNode,
                     new (self()->trHeapMemory()) TR::MemoryReference(stackPtr, offset, 4, self()->cg()),
                     argRegister, cursor);
               }
            numIntArgs++;
            break;
         case TR::Address:
            if (numIntArgs<properties.getNumIntArgRegs())
               {
               argRegister = machine->getRealRegister(properties.getIntegerArgumentRegister(numIntArgs));
               cursor = generateMemSrc1Instruction(self()->cg(),TR::InstOpCode::Op_st, firstNode,
                     new (self()->trHeapMemory()) TR::MemoryReference(stackPtr, offset, TR::Compiler->om.sizeofReferenceAddress(), self()->cg()),
                     argRegister, cursor);
               }
            numIntArgs++;
            break;
         case TR::Int64:
            if (hasToStoreToStack &&
                  numIntArgs<properties.getNumIntArgRegs())
               {
               argRegister = machine->getRealRegister(properties.getIntegerArgumentRegister(numIntArgs));
               if (TR::Compiler->target.is64Bit())
                  cursor = generateMemSrc1Instruction(self()->cg(),TR::InstOpCode::Op_st, firstNode,
                        new (self()->trHeapMemory()) TR::MemoryReference(stackPtr, offset, 8, self()->cg()),
                        argRegister, cursor);
               else
                  {
                  cursor = generateMemSrc1Instruction(self()->cg(), TR::InstOpCode::stw, firstNode,
                        new (self()->trHeapMemory()) TR::MemoryReference(stackPtr, offset, 4, self()->cg()),
                        argRegister, cursor);
                  if (numIntArgs < properties.getNumIntArgRegs()-1)
                     {
                     argRegister = machine->getRealRegister(properties.getIntegerArgumentRegister(numIntArgs+1));
                     cursor = generateMemSrc1Instruction(self()->cg(), TR::InstOpCode::stw, firstNode,
                           new (self()->trHeapMemory()) TR::MemoryReference(stackPtr, offset+4, 4, self()->cg()),
                           argRegister, cursor);
                     }
                  }
               }
            if (TR::Compiler->target.is64Bit())
               numIntArgs++;
            else
               numIntArgs+=2;
            break;
         case TR::Float:
            if (hasToStoreToStack &&
                  numFloatArgs<properties.getNumFloatArgRegs())
               {
               argRegister = machine->getRealRegister(properties.getFloatArgumentRegister(numFloatArgs));
               cursor = generateMemSrc1Instruction(self()->cg(), TR::InstOpCode::stfs, firstNode,
                     new (self()->trHeapMemory()) TR::MemoryReference(stackPtr, offset, 4, self()->cg()),
                     argRegister, cursor);
               }
            numFloatArgs++;
            break;
         case TR::Double:
            if (hasToStoreToStack &&
                  numFloatArgs<properties.getNumFloatArgRegs())
               {
               argRegister = machine->getRealRegister(properties.getFloatArgumentRegister(numFloatArgs));
               cursor = generateMemSrc1Instruction(self()->cg(), TR::InstOpCode::stfd, firstNode,
                     new (self()->trHeapMemory()) TR::MemoryReference(stackPtr, offset, 8, self()->cg()),
                     argRegister, cursor);
               }
            numFloatArgs++;
            break;
         }
      paramCursor = paramIterator.getNext();
      }
   return(cursor);
//.........这里部分代码省略.........

TR::Instruction *OMR::Power::Linkage::saveArguments(TR::Instruction *cursor, bool fsd, bool saveOnly,
                                             List<TR::ParameterSymbol> &parmList)
   {
   #define  REAL_REGISTER(ri)  machine->getRealRegister(ri)
   #define  REGNUM(ri)         ((TR::RealRegister::RegNum)(ri))
   const TR::PPCLinkageProperties& properties = self()->getProperties();
   TR::Machine *machine = self()->machine();
   TR::RealRegister      *stackPtr   = self()->cg()->getStackPointerRegister();
   TR::ResolvedMethodSymbol    *bodySymbol = self()->comp()->getJittedMethodSymbol();
   ListIterator<TR::ParameterSymbol>   paramIterator(&parmList);
   TR::ParameterSymbol      *paramCursor;
   TR::Node                 *firstNode = self()->comp()->getStartTree()->getNode();
   TR_BitVector             freeScratchable;
   int32_t                  busyMoves[3][64];
   int32_t                  busyIndex = 0, i1;


   bool all_saved  = false;

   // the freeScratchable structure will not be used when saveOnly == true
   // no additional conditions were added with the intention of keeping the code easier to read
   // and not full of if conditions

   freeScratchable.init(TR::RealRegister::LastFPR + 1, self()->trMemory());

   // first, consider all argument registers free
   for (i1=TR::RealRegister::FirstGPR; i1<=TR::RealRegister::LastFPR; i1++)
      {
      if (!properties.getReserved(REGNUM(i1)))
         {
         freeScratchable.set(i1);
         }
      }
   // second, go through all parameters and reset registers that are actually used
   for (paramCursor=paramIterator.getFirst(); paramCursor!=NULL; paramCursor=paramIterator.getNext())
      {
      int32_t lri = paramCursor->getLinkageRegisterIndex();
      TR::DataType type = paramCursor->getType();

      if (lri >= 0)
         {
         TR::RealRegister::RegNum regNum;
         bool twoRegs = (TR::Compiler->target.is32Bit() && type.isInt64() && lri < properties.getNumIntArgRegs()-1);

         if (!type.isFloatingPoint())
            {
            regNum = properties.getIntegerArgumentRegister(lri);
            if (paramCursor->isReferencedParameter()) freeScratchable.reset(regNum);
            if (twoRegs)
               if (paramCursor->isReferencedParameter()) freeScratchable.reset(regNum+1);
            }
         else
            {
            regNum = properties.getFloatArgumentRegister(lri);
            if (paramCursor->isReferencedParameter()) freeScratchable.reset(regNum);
            if (twoRegs)
               if (paramCursor->isReferencedParameter()) freeScratchable.reset(regNum+1);
            }
         }
      }

   for (paramCursor=paramIterator.getFirst(); paramCursor!=NULL; paramCursor=paramIterator.getNext())
      {
      int32_t lri = paramCursor->getLinkageRegisterIndex();
      int32_t ai  = paramCursor->getAllocatedIndex();
      int32_t offset = self()->calculateParameterRegisterOffset(paramCursor->getParameterOffset(), *paramCursor);
      TR::DataType type = paramCursor->getType();
      int32_t dtype = type.getDataType();


      // TODO: Is there an accurate assume to insert here ?
      if (lri >= 0)
         {
         if (!paramCursor->isReferencedParameter() && !paramCursor->isParmHasToBeOnStack()) continue;

         TR::RealRegister::RegNum regNum;
         bool twoRegs = (TR::Compiler->target.is32Bit() && type.isInt64() && lri < properties.getNumIntArgRegs()-1);

         if (type.isFloatingPoint())
            regNum = properties.getFloatArgumentRegister(lri);
         else
            regNum = properties.getIntegerArgumentRegister(lri);

         // Do not save arguments to the stack if in Full Speed Debug and saveOnly is not set.
         // If not in Full Speed Debug, the arguments will be saved.
         if (((ai<0 || self()->hasToBeOnStack(paramCursor)) && !fsd) || (fsd && saveOnly))
            {
            switch (dtype)
               {
               case TR::Int8:
               case TR::Int16:
               case TR::Int32:
                  {
                  TR::InstOpCode::Mnemonic op = TR::InstOpCode::stw;
                  if (!all_saved) cursor = generateMemSrc1Instruction(self()->cg(), op, firstNode,
                           new (self()->trHeapMemory()) TR::MemoryReference(stackPtr, offset, 4, self()->cg()), REAL_REGISTER(regNum), cursor);
                  }
                  break;
               case TR::Address:
                  if (!all_saved) cursor = generateMemSrc1Instruction(self()->cg(),TR::InstOpCode::Op_st, firstNode,
//.........这里部分代码省略.........