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 package jdk.vm.ci.hotspot.aarch64; 24 25 import static jdk.vm.ci.aarch64.AArch64.lr; 26 import static jdk.vm.ci.aarch64.AArch64.r0; 27 import static jdk.vm.ci.aarch64.AArch64.r1; 28 import static jdk.vm.ci.aarch64.AArch64.r12; 29 import static jdk.vm.ci.aarch64.AArch64.r2; 30 import static jdk.vm.ci.aarch64.AArch64.r27; 31 import static jdk.vm.ci.aarch64.AArch64.r28; 32 import static jdk.vm.ci.aarch64.AArch64.r29; 33 import static jdk.vm.ci.aarch64.AArch64.r3; 34 import static jdk.vm.ci.aarch64.AArch64.r31; 35 import static jdk.vm.ci.aarch64.AArch64.r4; 36 import static jdk.vm.ci.aarch64.AArch64.r5; 37 import static jdk.vm.ci.aarch64.AArch64.r6; 38 import static jdk.vm.ci.aarch64.AArch64.r7; 39 import static jdk.vm.ci.aarch64.AArch64.r9; 40 import static jdk.vm.ci.aarch64.AArch64.sp; 41 import static jdk.vm.ci.aarch64.AArch64.v0; 42 import static jdk.vm.ci.aarch64.AArch64.v1; 43 import static jdk.vm.ci.aarch64.AArch64.v2; 44 import static jdk.vm.ci.aarch64.AArch64.v3; 45 import static jdk.vm.ci.aarch64.AArch64.v4; 46 import static jdk.vm.ci.aarch64.AArch64.v5; 47 import static jdk.vm.ci.aarch64.AArch64.v6; 48 import static jdk.vm.ci.aarch64.AArch64.v7; 49 import static jdk.vm.ci.aarch64.AArch64.zr; 50 51 import java.util.ArrayList; 52 import java.util.Arrays; 53 import java.util.Collections; 54 import java.util.HashSet; 55 import java.util.List; 56 import java.util.Set; 57 58 import jdk.vm.ci.aarch64.AArch64; 59 import jdk.vm.ci.code.Architecture; 60 import jdk.vm.ci.code.CallingConvention; 61 import jdk.vm.ci.code.CallingConvention.Type; 62 import jdk.vm.ci.code.Register; 63 import jdk.vm.ci.code.RegisterAttributes; 64 import jdk.vm.ci.code.RegisterConfig; 65 import jdk.vm.ci.code.StackSlot; 66 import jdk.vm.ci.code.TargetDescription; 67 import jdk.vm.ci.common.JVMCIError; 68 import jdk.vm.ci.hotspot.HotSpotCallingConventionType; 69 import jdk.vm.ci.hotspot.HotSpotVMConfig; 70 import jdk.vm.ci.meta.AllocatableValue; 71 import jdk.vm.ci.meta.JavaKind; 72 import jdk.vm.ci.meta.JavaType; 73 import jdk.vm.ci.meta.LIRKind; 74 import jdk.vm.ci.meta.PlatformKind; 75 import jdk.vm.ci.meta.Value; 76 77 public class AArch64HotSpotRegisterConfig implements RegisterConfig { 78 79 private final Architecture architecture; 80 81 private final Register[] allocatable; 82 83 private final int maxFrameSize; 84 85 /** 86 * The caller saved registers always include all parameter registers. 87 */ 88 private final Register[] callerSaved; 89 90 private final boolean allAllocatableAreCallerSaved; 91 92 private final RegisterAttributes[] attributesMap; 93 94 public int getMaximumFrameSize() { 95 return maxFrameSize; 96 } 97 98 @Override 99 public Register[] getAllocatableRegisters() { 100 return allocatable.clone(); 101 } 102 103 @Override 104 public Register[] filterAllocatableRegisters(PlatformKind kind, Register[] registers) { 105 ArrayList<Register> list = new ArrayList<>(); 106 for (Register reg : registers) { 107 if (architecture.canStoreValue(reg.getRegisterCategory(), kind)) { 108 list.add(reg); 109 } 110 } 111 112 Register[] ret = list.toArray(new Register[list.size()]); 113 return ret; 114 } 115 116 @Override 117 public RegisterAttributes[] getAttributesMap() { 118 return attributesMap.clone(); 119 } 120 121 private final Register[] javaGeneralParameterRegisters = {r1, r2, r3, r4, r5, r6, r7, r0}; 122 private final Register[] nativeGeneralParameterRegisters = {r0, r1, r2, r3, r4, r5, r6, r7}; 123 private final Register[] simdParameterRegisters = {v0, v1, v2, v3, v4, v5, v6, v7}; 124 125 public static final Register inlineCacheRegister = r9; 126 127 /** 128 * Vtable stubs expect the metaspace Method in r12. 129 */ 130 public static final Register metaspaceMethodRegister = r12; 131 132 public static final Register heapBaseRegister = r27; 133 public static final Register threadRegister = r28; 134 public static final Register fp = r29; 135 136 private static final Register[] reservedRegisters = {threadRegister, fp, lr, r31, zr, sp}; 137 138 private static Register[] initAllocatable(Architecture arch, boolean reserveForHeapBase) { 139 Register[] allRegisters = arch.getAvailableValueRegisters(); 140 Register[] registers = new Register[allRegisters.length - reservedRegisters.length - (reserveForHeapBase ? 1 : 0)]; 141 List<Register> reservedRegistersList = Arrays.asList(reservedRegisters); 142 143 int idx = 0; 144 for (Register reg : allRegisters) { 145 if (reservedRegistersList.contains(reg)) { 146 // skip reserved registers 147 continue; 148 } 149 assert !(reg.equals(threadRegister) || reg.equals(fp) || reg.equals(lr) || reg.equals(r31) || reg.equals(zr) || reg.equals(sp)); 150 if (reserveForHeapBase && reg.equals(heapBaseRegister)) { 151 // skip heap base register 152 continue; 153 } 154 155 registers[idx++] = reg; 156 } 157 158 assert idx == registers.length; 159 return registers; 160 } 161 162 public AArch64HotSpotRegisterConfig(Architecture architecture, HotSpotVMConfig config) { 163 this(architecture, config, initAllocatable(architecture, config.useCompressedOops)); 164 assert callerSaved.length >= allocatable.length; 165 } 166 167 public AArch64HotSpotRegisterConfig(Architecture architecture, HotSpotVMConfig config, Register[] allocatable) { 168 this.architecture = architecture; 169 this.maxFrameSize = config.maxFrameSize; 170 171 this.allocatable = allocatable.clone(); 172 Set<Register> callerSaveSet = new HashSet<>(); 173 Collections.addAll(callerSaveSet, allocatable); 174 Collections.addAll(callerSaveSet, simdParameterRegisters); 175 Collections.addAll(callerSaveSet, javaGeneralParameterRegisters); 176 Collections.addAll(callerSaveSet, nativeGeneralParameterRegisters); 177 callerSaved = callerSaveSet.toArray(new Register[callerSaveSet.size()]); 178 179 allAllocatableAreCallerSaved = true; 180 attributesMap = RegisterAttributes.createMap(this, AArch64.allRegisters); 181 } 182 183 @Override 184 public Register[] getCallerSaveRegisters() { 185 return callerSaved; 186 } 187 188 public Register[] getCalleeSaveRegisters() { 189 return null; 190 } 191 192 @Override 193 public boolean areAllAllocatableRegistersCallerSaved() { 194 return allAllocatableAreCallerSaved; 195 } 196 197 @Override 198 public Register getRegisterForRole(int index) { 199 throw new UnsupportedOperationException(); 200 } 201 202 @Override 203 public CallingConvention getCallingConvention(Type type, JavaType returnType, JavaType[] parameterTypes, TargetDescription target) { 204 HotSpotCallingConventionType hotspotType = (HotSpotCallingConventionType) type; 205 if (type == HotSpotCallingConventionType.NativeCall) { 206 return callingConvention(nativeGeneralParameterRegisters, returnType, parameterTypes, hotspotType, target); 207 } 208 // On x64, parameter locations are the same whether viewed 209 // from the caller or callee perspective 210 return callingConvention(javaGeneralParameterRegisters, returnType, parameterTypes, hotspotType, target); 211 } 212 213 @Override 214 public Register[] getCallingConventionRegisters(Type type, JavaKind kind) { 215 HotSpotCallingConventionType hotspotType = (HotSpotCallingConventionType) type; 216 switch (kind) { 217 case Boolean: 218 case Byte: 219 case Short: 220 case Char: 221 case Int: 222 case Long: 223 case Object: 224 return hotspotType == HotSpotCallingConventionType.NativeCall ? nativeGeneralParameterRegisters : javaGeneralParameterRegisters; 225 case Float: 226 case Double: 227 return simdParameterRegisters; 228 default: 229 throw JVMCIError.shouldNotReachHere(); 230 } 231 } 232 233 private CallingConvention callingConvention(Register[] generalParameterRegisters, JavaType returnType, JavaType[] parameterTypes, HotSpotCallingConventionType type, TargetDescription target) { 234 AllocatableValue[] locations = new AllocatableValue[parameterTypes.length]; 235 236 int currentGeneral = 0; 237 int currentSIMD = 0; 238 int currentStackOffset = 0; 239 240 for (int i = 0; i < parameterTypes.length; i++) { 241 final JavaKind kind = parameterTypes[i].getJavaKind().getStackKind(); 242 243 switch (kind) { 244 case Byte: 245 case Boolean: 246 case Short: 247 case Char: 248 case Int: 249 case Long: 250 case Object: 251 if (currentGeneral < generalParameterRegisters.length) { 252 Register register = generalParameterRegisters[currentGeneral++]; 253 locations[i] = register.asValue(target.getLIRKind(kind)); 254 } 255 break; 256 case Float: 257 case Double: 258 if (currentSIMD < simdParameterRegisters.length) { 259 Register register = simdParameterRegisters[currentSIMD++]; 260 locations[i] = register.asValue(target.getLIRKind(kind)); 261 } 262 break; 263 default: 264 throw JVMCIError.shouldNotReachHere(); 265 } 266 267 if (locations[i] == null) { 268 LIRKind lirKind = target.getLIRKind(kind); 269 locations[i] = StackSlot.get(lirKind, currentStackOffset, !type.out); 270 currentStackOffset += Math.max(lirKind.getPlatformKind().getSizeInBytes(), target.wordSize); 271 } 272 } 273 274 JavaKind returnKind = returnType == null ? JavaKind.Void : returnType.getJavaKind(); 275 AllocatableValue returnLocation = returnKind == JavaKind.Void ? Value.ILLEGAL : getReturnRegister(returnKind).asValue(target.getLIRKind(returnKind.getStackKind())); 276 return new CallingConvention(currentStackOffset, returnLocation, locations); 277 } 278 279 @Override 280 public Register getReturnRegister(JavaKind kind) { 281 switch (kind) { 282 case Boolean: 283 case Byte: 284 case Char: 285 case Short: 286 case Int: 287 case Long: 288 case Object: 289 return r0; 290 case Float: 291 case Double: 292 return v0; 293 case Void: 294 case Illegal: 295 return null; 296 default: 297 throw new UnsupportedOperationException("no return register for type " + kind); 298 } 299 } 300 301 @Override 302 public Register getFrameRegister() { 303 return sp; 304 } 305 306 @Override 307 public String toString() { 308 return String.format("Allocatable: " + Arrays.toString(getAllocatableRegisters()) + "%n" + "CallerSave: " + Arrays.toString(getCallerSaveRegisters()) + "%n"); 309 } 310 }