/* * This file is part of the Jikes RVM project (http://jikesrvm.org). * * This file is licensed to You under the Eclipse Public License (EPL); * You may not use this file except in compliance with the License. You * may obtain a copy of the License at * * http://www.opensource.org/licenses/eclipse-1.0.php * * See the COPYRIGHT.txt file distributed with this work for information * regarding copyright ownership. */ package org.jikesrvm.compilers.opt.ir; import org.jikesrvm.VM; import org.jikesrvm.classloader.RVMMethod; import org.jikesrvm.classloader.TypeReference; import org.jikesrvm.compilers.opt.ir.operand.Operand; import org.jikesrvm.compilers.opt.ir.operand.RegisterOperand; /** * Pool of symbolic registers. * Each IR contains has exactly one register pool object associated with it. * * @see Register */ public abstract class GenericRegisterPool extends AbstractRegisterPool { protected final GenericPhysicalRegisterSet physical; public GenericPhysicalRegisterSet getPhysicalRegisterSet() { return physical; } /** * Initializes a new register pool for the method meth. * * @param meth the RVMMethod of the outermost method */ protected GenericRegisterPool(RVMMethod meth) { if (VM.BuildForIA32) { physical = new org.jikesrvm.compilers.opt.ir.ia32.PhysicalRegisterSet(); } else { if (VM.VerifyAssertions) VM._assert(VM.BuildForPowerPC); physical = new org.jikesrvm.compilers.opt.ir.ppc.PhysicalRegisterSet(); } // currentNum is assigned an initial value to avoid overlap of // physical and symbolic registers. currentNum = physical.getNumberOfPhysicalRegisters(); } /** * Return the number of symbolic registers (doesn't count physical ones) * @return the number of symbolic registers allocated by the pool */ public int getNumberOfSymbolicRegisters() { int start = physical.getNumberOfPhysicalRegisters(); return currentNum - start; } /** * @return the total number of register in the pool, including physical ones */ public int getTotalNumberOfRegisters() { return currentNum; } /** * Get the Framepointer (FP) * * @return the FP register */ public Register getFP() { return physical.getFP(); } /** * Get a temporary that represents the FP register * * @return the temp */ public RegisterOperand makeFPOp() { return new RegisterOperand(getFP(), TypeReference.Address); } /** * Get a temporary that represents the PR register * * @return the temp */ public RegisterOperand makeTROp() { RegisterOperand trOp = new RegisterOperand(physical.getTR(), TypeReference.Thread); trOp.setPreciseType(); return trOp; } /** * @return a temporary that represents the JTOC register (as an Address) */ public abstract Operand makeJTOCOp(); /** * @return a temporary that represents the JTOC register (as an Object) */ public abstract Operand makeTocOp(); }