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/*
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* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.vm.ci.hotspot.aarch64;
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import static jdk.vm.ci.aarch64.AArch64.lr;
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import static jdk.vm.ci.aarch64.AArch64.r0;
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import static jdk.vm.ci.aarch64.AArch64.r1;
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import static jdk.vm.ci.aarch64.AArch64.r2;
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import static jdk.vm.ci.aarch64.AArch64.r3;
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import static jdk.vm.ci.aarch64.AArch64.r4;
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import static jdk.vm.ci.aarch64.AArch64.r5;
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import static jdk.vm.ci.aarch64.AArch64.r6;
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import static jdk.vm.ci.aarch64.AArch64.r7;
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import static jdk.vm.ci.aarch64.AArch64.rscratch1;
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import static jdk.vm.ci.aarch64.AArch64.rscratch2;
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import static jdk.vm.ci.aarch64.AArch64.r12;
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import static jdk.vm.ci.aarch64.AArch64.r27;
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import static jdk.vm.ci.aarch64.AArch64.r28;
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import static jdk.vm.ci.aarch64.AArch64.r29;
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import static jdk.vm.ci.aarch64.AArch64.r31;
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import static jdk.vm.ci.aarch64.AArch64.sp;
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import static jdk.vm.ci.aarch64.AArch64.v0;
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import static jdk.vm.ci.aarch64.AArch64.v1;
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import static jdk.vm.ci.aarch64.AArch64.v2;
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import static jdk.vm.ci.aarch64.AArch64.v3;
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import static jdk.vm.ci.aarch64.AArch64.v4;
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import static jdk.vm.ci.aarch64.AArch64.v5;
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import static jdk.vm.ci.aarch64.AArch64.v6;
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import static jdk.vm.ci.aarch64.AArch64.v7;
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import static jdk.vm.ci.aarch64.AArch64.zr;
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import java.util.ArrayList;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Set;
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import jdk.vm.ci.aarch64.AArch64;
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import jdk.vm.ci.code.Architecture;
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import jdk.vm.ci.code.CallingConvention;
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import jdk.vm.ci.code.CallingConvention.Type;
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import jdk.vm.ci.code.Register;
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import jdk.vm.ci.code.RegisterArray;
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import jdk.vm.ci.code.RegisterAttributes;
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import jdk.vm.ci.code.RegisterConfig;
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import jdk.vm.ci.code.StackSlot;
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import jdk.vm.ci.code.TargetDescription;
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import jdk.vm.ci.code.ValueKindFactory;
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import jdk.vm.ci.common.JVMCIError;
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import jdk.vm.ci.hotspot.HotSpotCallingConventionType;
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import jdk.vm.ci.meta.AllocatableValue;
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import jdk.vm.ci.meta.JavaKind;
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import jdk.vm.ci.meta.JavaType;
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import jdk.vm.ci.meta.PlatformKind;
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import jdk.vm.ci.meta.Value;
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import jdk.vm.ci.meta.ValueKind;
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public class AArch64HotSpotRegisterConfig implements RegisterConfig {
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private final TargetDescription target;
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private final RegisterArray allocatable;
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/**
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* The caller saved registers always include all parameter registers.
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*/
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private final RegisterArray callerSaved;
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private final boolean allAllocatableAreCallerSaved;
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private final RegisterAttributes[] attributesMap;
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@Override
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public RegisterArray getAllocatableRegisters() {
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return allocatable;
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}
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@Override
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public RegisterArray filterAllocatableRegisters(PlatformKind kind, RegisterArray registers) {
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ArrayList<Register> list = new ArrayList<>();
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for (Register reg : registers) {
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if (target.arch.canStoreValue(reg.getRegisterCategory(), kind)) {
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list.add(reg);
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}
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}
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return new RegisterArray(list);
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}
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@Override
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public RegisterAttributes[] getAttributesMap() {
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return attributesMap.clone();
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}
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private final RegisterArray javaGeneralParameterRegisters = new RegisterArray(r1, r2, r3, r4, r5, r6, r7, r0);
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private final RegisterArray nativeGeneralParameterRegisters = new RegisterArray(r0, r1, r2, r3, r4, r5, r6, r7);
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private final RegisterArray simdParameterRegisters = new RegisterArray(v0, v1, v2, v3, v4, v5, v6, v7);
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public static final Register inlineCacheRegister = rscratch2;
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/**
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* Vtable stubs expect the metaspace Method in r12.
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*/
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public static final Register metaspaceMethodRegister = r12;
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public static final Register heapBaseRegister = r27;
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public static final Register threadRegister = r28;
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public static final Register fp = r29;
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private static final RegisterArray reservedRegisters
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= new RegisterArray(rscratch1, rscratch2, threadRegister, fp, lr, r31, zr, sp);
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private static RegisterArray initAllocatable(Architecture arch, boolean reserveForHeapBase) {
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RegisterArray allRegisters = arch.getAvailableValueRegisters();
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Register[] registers = new Register[allRegisters.size() - reservedRegisters.size() - (reserveForHeapBase ? 1 : 0)];
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List<Register> reservedRegistersList = reservedRegisters.asList();
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int idx = 0;
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for (Register reg : allRegisters) {
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if (reservedRegistersList.contains(reg)) {
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// skip reserved registers
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continue;
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}
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assert !(reg.equals(threadRegister) || reg.equals(fp) || reg.equals(lr) || reg.equals(r31) || reg.equals(zr) || reg.equals(sp));
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if (reserveForHeapBase && reg.equals(heapBaseRegister)) {
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// skip heap base register
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continue;
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}
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registers[idx++] = reg;
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}
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assert idx == registers.length;
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return new RegisterArray(registers);
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}
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public AArch64HotSpotRegisterConfig(TargetDescription target, boolean useCompressedOops) {
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this(target, initAllocatable(target.arch, useCompressedOops));
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assert callerSaved.size() >= allocatable.size();
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}
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public AArch64HotSpotRegisterConfig(TargetDescription target, RegisterArray allocatable) {
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this.target = target;
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this.allocatable = allocatable;
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Set<Register> callerSaveSet = new HashSet<>();
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allocatable.addTo(callerSaveSet);
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simdParameterRegisters.addTo(callerSaveSet);
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javaGeneralParameterRegisters.addTo(callerSaveSet);
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nativeGeneralParameterRegisters.addTo(callerSaveSet);
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callerSaved = new RegisterArray(callerSaveSet);
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allAllocatableAreCallerSaved = true;
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attributesMap = RegisterAttributes.createMap(this, AArch64.allRegisters);
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}
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@Override
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public RegisterArray getCallerSaveRegisters() {
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return callerSaved;
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}
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public RegisterArray getCalleeSaveRegisters() {
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return null;
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}
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@Override
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public boolean areAllAllocatableRegistersCallerSaved() {
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return allAllocatableAreCallerSaved;
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}
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@Override
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public CallingConvention getCallingConvention(Type type, JavaType returnType, JavaType[] parameterTypes, ValueKindFactory<?> valueKindFactory) {
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HotSpotCallingConventionType hotspotType = (HotSpotCallingConventionType) type;
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if (type == HotSpotCallingConventionType.NativeCall) {
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return callingConvention(nativeGeneralParameterRegisters, returnType, parameterTypes, hotspotType, valueKindFactory);
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}
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// On x64, parameter locations are the same whether viewed
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// from the caller or callee perspective
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return callingConvention(javaGeneralParameterRegisters, returnType, parameterTypes, hotspotType, valueKindFactory);
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}
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@Override
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public RegisterArray getCallingConventionRegisters(Type type, JavaKind kind) {
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HotSpotCallingConventionType hotspotType = (HotSpotCallingConventionType) type;
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switch (kind) {
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case Boolean:
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case Byte:
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case Short:
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case Char:
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case Int:
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case Long:
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case Object:
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return hotspotType == HotSpotCallingConventionType.NativeCall ? nativeGeneralParameterRegisters : javaGeneralParameterRegisters;
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case Float:
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case Double:
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return simdParameterRegisters;
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default:
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throw JVMCIError.shouldNotReachHere();
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}
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}
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private CallingConvention callingConvention(RegisterArray generalParameterRegisters, JavaType returnType, JavaType[] parameterTypes, HotSpotCallingConventionType type,
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ValueKindFactory<?> valueKindFactory) {
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AllocatableValue[] locations = new AllocatableValue[parameterTypes.length];
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int currentGeneral = 0;
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int currentSIMD = 0;
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int currentStackOffset = 0;
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for (int i = 0; i < parameterTypes.length; i++) {
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final JavaKind kind = parameterTypes[i].getJavaKind().getStackKind();
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switch (kind) {
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case Byte:
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case Boolean:
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case Short:
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case Char:
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case Int:
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case Long:
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case Object:
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if (currentGeneral < generalParameterRegisters.size()) {
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Register register = generalParameterRegisters.get(currentGeneral++);
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locations[i] = register.asValue(valueKindFactory.getValueKind(kind));
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}
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break;
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case Float:
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case Double:
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if (currentSIMD < simdParameterRegisters.size()) {
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Register register = simdParameterRegisters.get(currentSIMD++);
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locations[i] = register.asValue(valueKindFactory.getValueKind(kind));
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}
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break;
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default:
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throw JVMCIError.shouldNotReachHere();
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}
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if (locations[i] == null) {
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ValueKind<?> valueKind = valueKindFactory.getValueKind(kind);
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locations[i] = StackSlot.get(valueKind, currentStackOffset, !type.out);
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currentStackOffset += Math.max(valueKind.getPlatformKind().getSizeInBytes(), target.wordSize);
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}
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}
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JavaKind returnKind = returnType == null ? JavaKind.Void : returnType.getJavaKind();
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AllocatableValue returnLocation = returnKind == JavaKind.Void ? Value.ILLEGAL : getReturnRegister(returnKind).asValue(valueKindFactory.getValueKind(returnKind.getStackKind()));
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return new CallingConvention(currentStackOffset, returnLocation, locations);
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}
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@Override
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public Register getReturnRegister(JavaKind kind) {
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switch (kind) {
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case Boolean:
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case Byte:
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case Char:
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case Short:
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case Int:
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case Long:
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case Object:
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return r0;
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case Float:
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case Double:
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return v0;
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case Void:
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case Illegal:
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return null;
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default:
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throw new UnsupportedOperationException("no return register for type " + kind);
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}
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}
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@Override
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public Register getFrameRegister() {
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return sp;
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}
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@Override
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public String toString() {
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return String.format("Allocatable: " + getAllocatableRegisters() + "%n" + "CallerSave: " + getCallerSaveRegisters() + "%n");
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}
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}
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