001/*
002 *  This file is part of the Jikes RVM project (http://jikesrvm.org).
003 *
004 *  This file is licensed to You under the Eclipse Public License (EPL);
005 *  You may not use this file except in compliance with the License. You
006 *  may obtain a copy of the License at
007 *
008 *      http://www.opensource.org/licenses/eclipse-1.0.php
009 *
010 *  See the COPYRIGHT.txt file distributed with this work for information
011 *  regarding copyright ownership.
012 */
013package org.jikesrvm.compilers.opt.ir;
014
015import org.jikesrvm.VM;
016import org.jikesrvm.compilers.opt.ir.operand.Operand;
017import org.jikesrvm.compilers.opt.regalloc.LiveIntervalElement;
018
019/**
020 * Generic wrappers around machine-specific IR
021 */
022public abstract class MachineSpecificIR {
023  /* common to all ISAs */
024  public abstract boolean isConditionOperand(Operand operand);
025
026  public abstract void mutateMIRCondBranch(Instruction cb);
027
028  public abstract boolean isHandledByRegisterUnknown(char opcode);
029
030  public abstract boolean mayEscapeThread(Instruction instruction);
031
032  public abstract boolean mayEscapeMethod(Instruction instruction);
033
034  /* unique to IA32 */
035  public boolean isAdviseESP(Operator operator) {
036    if (VM.VerifyAssertions) VM._assert(VM.NOT_REACHED);
037    return false;
038  }
039
040  public boolean isFClear(Operator operator) {
041    if (VM.VerifyAssertions) VM._assert(VM.NOT_REACHED);
042    return false;
043  }
044
045  public boolean isFNInit(Operator operator) {
046    if (VM.VerifyAssertions) VM._assert(VM.NOT_REACHED);
047    return false;
048  }
049
050  public boolean isBURSManagedFPROperand(Operand operand) {
051    if (VM.VerifyAssertions) VM._assert(VM.NOT_REACHED);
052    return false;
053  }
054
055  public int getBURSManagedFPRValue(Operand operand) {
056    if (VM.VerifyAssertions) VM._assert(VM.NOT_REACHED);
057    return -1;
058  }
059
060  public boolean mutateFMOVs(LiveIntervalElement live, Register register, int dfnbegin, int dfnend) {
061    if (VM.VerifyAssertions) VM._assert(VM.NOT_REACHED);
062    return false;
063  }
064
065  public void rewriteFPStack(IR ir) {
066    if (VM.VerifyAssertions) VM._assert(VM.NOT_REACHED);
067  }
068
069  /* unique to PowerPC */
070  public boolean isPowerPCTrapOperand(Operand operand) {
071    if (VM.VerifyAssertions) VM._assert(VM.NOT_REACHED);
072    return false;
073  }
074
075  public boolean canFoldNullCheckAndLoad(Instruction s) {
076    if (VM.VerifyAssertions) VM._assert(VM.NOT_REACHED);
077    return false;
078  }
079}