1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 package org.graalvm.compiler.core.amd64;
  25 
  26 import static org.graalvm.compiler.asm.amd64.AMD64Assembler.OperandSize.QWORD;
  27 import static org.graalvm.compiler.asm.amd64.AMD64Assembler.OperandSize.WORD;
  28 
  29 import org.graalvm.compiler.core.common.LIRKind;
  30 import org.graalvm.compiler.lir.VirtualStackSlot;
  31 import org.graalvm.compiler.lir.amd64.AMD64LIRInstruction;
  32 import org.graalvm.compiler.lir.amd64.AMD64Move.AMD64PushPopStackMove;
  33 import org.graalvm.compiler.lir.framemap.FrameMapBuilder;
  34 import org.graalvm.compiler.lir.gen.LIRGeneratorTool.MoveFactory;
  35 import org.graalvm.util.Equivalence;
  36 import org.graalvm.util.EconomicMap;
  37 
  38 import jdk.vm.ci.amd64.AMD64Kind;
  39 import jdk.vm.ci.code.Architecture;
  40 import jdk.vm.ci.code.Register;
  41 import jdk.vm.ci.code.RegisterArray;
  42 import jdk.vm.ci.code.RegisterConfig;
  43 import jdk.vm.ci.meta.AllocatableValue;
  44 import jdk.vm.ci.meta.PlatformKind;
  45 
  46 public abstract class AMD64MoveFactoryBase implements MoveFactory {
  47 
  48     private final BackupSlotProvider backupSlotProvider;
  49 
  50     private static class RegisterBackupPair {
  51         public final Register register;
  52         public final VirtualStackSlot backupSlot;
  53 
  54         RegisterBackupPair(Register register, VirtualStackSlot backupSlot) {
  55             this.register = register;
  56             this.backupSlot = backupSlot;
  57         }
  58     }
  59 
  60     public static final class BackupSlotProvider {
  61 
  62         private final FrameMapBuilder frameMapBuilder;
  63         private EconomicMap<PlatformKind.Key, RegisterBackupPair> categorized;
  64 
  65         public BackupSlotProvider(FrameMapBuilder frameMapBuilder) {
  66             this.frameMapBuilder = frameMapBuilder;
  67         }
  68 
  69         protected RegisterBackupPair getScratchRegister(PlatformKind kind) {
  70             PlatformKind.Key key = kind.getKey();
  71             if (categorized == null) {
  72                 categorized = EconomicMap.create(Equivalence.DEFAULT);
  73             } else if (categorized.containsKey(key)) {
  74                 return categorized.get(key);
  75             }
  76 
  77             RegisterConfig registerConfig = frameMapBuilder.getRegisterConfig();
  78 
  79             RegisterArray availableRegister = registerConfig.filterAllocatableRegisters(kind, registerConfig.getAllocatableRegisters());
  80             assert availableRegister != null && availableRegister.size() > 1;
  81             Register scratchRegister = availableRegister.get(0);
  82 
  83             Architecture arch = frameMapBuilder.getCodeCache().getTarget().arch;
  84             LIRKind largestKind = LIRKind.value(arch.getLargestStorableKind(scratchRegister.getRegisterCategory()));
  85             VirtualStackSlot backupSlot = frameMapBuilder.allocateSpillSlot(largestKind);
  86 
  87             RegisterBackupPair value = new RegisterBackupPair(scratchRegister, backupSlot);
  88             categorized.put(key, value);
  89 
  90             return value;
  91         }
  92     }
  93 
  94     public AMD64MoveFactoryBase(BackupSlotProvider backupSlotProvider) {
  95         this.backupSlotProvider = backupSlotProvider;
  96     }
  97 
  98     @Override
  99     public final AMD64LIRInstruction createStackMove(AllocatableValue result, AllocatableValue input) {
 100         AMD64Kind kind = (AMD64Kind) result.getPlatformKind();
 101         switch (kind.getSizeInBytes()) {
 102             case 2:
 103                 return new AMD64PushPopStackMove(WORD, result, input);
 104             case 8:
 105                 return new AMD64PushPopStackMove(QWORD, result, input);
 106             default:
 107                 RegisterBackupPair backup = backupSlotProvider.getScratchRegister(input.getPlatformKind());
 108                 Register scratchRegister = backup.register;
 109                 VirtualStackSlot backupSlot = backup.backupSlot;
 110                 return createStackMove(result, input, scratchRegister, backupSlot);
 111         }
 112     }
 113 
 114     public abstract AMD64LIRInstruction createStackMove(AllocatableValue result, AllocatableValue input, Register scratchRegister, AllocatableValue backupSlot);
 115 }