1 /*
   2  * Copyright (c) 2015, 2018, 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 
  25 
  26 package org.graalvm.compiler.core.amd64;
  27 
  28 import static org.graalvm.compiler.asm.amd64.AMD64BaseAssembler.OperandSize.QWORD;
  29 import static org.graalvm.compiler.asm.amd64.AMD64BaseAssembler.OperandSize.WORD;
  30 
  31 import jdk.internal.vm.compiler.collections.EconomicMap;
  32 import jdk.internal.vm.compiler.collections.Equivalence;
  33 import org.graalvm.compiler.core.common.LIRKind;
  34 import org.graalvm.compiler.lir.VirtualStackSlot;
  35 import org.graalvm.compiler.lir.amd64.AMD64LIRInstruction;
  36 import org.graalvm.compiler.lir.amd64.AMD64Move.AMD64PushPopStackMove;
  37 import org.graalvm.compiler.lir.framemap.FrameMapBuilder;
  38 import org.graalvm.compiler.lir.gen.LIRGeneratorTool.MoveFactory;
  39 
  40 import jdk.vm.ci.amd64.AMD64Kind;
  41 import jdk.vm.ci.code.Architecture;
  42 import jdk.vm.ci.code.Register;
  43 import jdk.vm.ci.code.RegisterArray;
  44 import jdk.vm.ci.code.RegisterConfig;
  45 import jdk.vm.ci.meta.AllocatableValue;
  46 import jdk.vm.ci.meta.PlatformKind;
  47 
  48 public abstract class AMD64MoveFactoryBase implements MoveFactory {
  49 
  50     private final BackupSlotProvider backupSlotProvider;
  51 
  52     private static class RegisterBackupPair {
  53         public final Register register;
  54         public final VirtualStackSlot backupSlot;
  55 
  56         RegisterBackupPair(Register register, VirtualStackSlot backupSlot) {
  57             this.register = register;
  58             this.backupSlot = backupSlot;
  59         }
  60     }
  61 
  62     public static final class BackupSlotProvider {
  63 
  64         private final FrameMapBuilder frameMapBuilder;
  65         private EconomicMap<PlatformKind.Key, RegisterBackupPair> categorized;
  66 
  67         public BackupSlotProvider(FrameMapBuilder frameMapBuilder) {
  68             this.frameMapBuilder = frameMapBuilder;
  69         }
  70 
  71         protected RegisterBackupPair getScratchRegister(PlatformKind kind) {
  72             PlatformKind.Key key = kind.getKey();
  73             if (categorized == null) {
  74                 categorized = EconomicMap.create(Equivalence.DEFAULT);
  75             } else if (categorized.containsKey(key)) {
  76                 return categorized.get(key);
  77             }
  78 
  79             RegisterConfig registerConfig = frameMapBuilder.getRegisterConfig();
  80 
  81             RegisterArray availableRegister = registerConfig.filterAllocatableRegisters(kind, registerConfig.getAllocatableRegisters());
  82             assert availableRegister != null && availableRegister.size() > 1;
  83             Register scratchRegister = availableRegister.get(0);
  84 
  85             Architecture arch = frameMapBuilder.getCodeCache().getTarget().arch;
  86             LIRKind largestKind = LIRKind.value(arch.getLargestStorableKind(scratchRegister.getRegisterCategory()));
  87             VirtualStackSlot backupSlot = frameMapBuilder.allocateSpillSlot(largestKind);
  88 
  89             RegisterBackupPair value = new RegisterBackupPair(scratchRegister, backupSlot);
  90             categorized.put(key, value);
  91 
  92             return value;
  93         }
  94     }
  95 
  96     public AMD64MoveFactoryBase(BackupSlotProvider backupSlotProvider) {
  97         this.backupSlotProvider = backupSlotProvider;
  98     }
  99 
 100     @Override
 101     public final AMD64LIRInstruction createStackMove(AllocatableValue result, AllocatableValue input) {
 102         AMD64Kind kind = (AMD64Kind) result.getPlatformKind();
 103         switch (kind.getSizeInBytes()) {
 104             case 2:
 105                 return new AMD64PushPopStackMove(WORD, result, input);
 106             case 8:
 107                 return new AMD64PushPopStackMove(QWORD, result, input);
 108             default:
 109                 RegisterBackupPair backup = backupSlotProvider.getScratchRegister(input.getPlatformKind());
 110                 Register scratchRegister = backup.register;
 111                 VirtualStackSlot backupSlot = backup.backupSlot;
 112                 return createStackMove(result, input, scratchRegister, backupSlot);
 113         }
 114     }
 115 
 116     public abstract AMD64LIRInstruction createStackMove(AllocatableValue result, AllocatableValue input, Register scratchRegister, AllocatableValue backupSlot);
 117 }