--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.jvmci.hotspot.amd64/src/com/oracle/jvmci/hotspot/amd64/AMD64HotSpotRegisterConfig.java	Tue Jun 02 23:29:27 2015 +0200
@@ -0,0 +1,268 @@
+/*
+ * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.jvmci.hotspot.amd64;
+
+import com.oracle.jvmci.amd64.*;
+import com.oracle.jvmci.code.Register;
+import com.oracle.jvmci.code.RegisterConfig;
+import com.oracle.jvmci.code.TargetDescription;
+import com.oracle.jvmci.code.CallingConvention;
+import com.oracle.jvmci.code.StackSlot;
+import com.oracle.jvmci.code.RegisterAttributes;
+import com.oracle.jvmci.code.CalleeSaveLayout;
+import com.oracle.jvmci.code.Architecture;
+import com.oracle.jvmci.meta.JavaType;
+import com.oracle.jvmci.meta.Value;
+import com.oracle.jvmci.meta.PlatformKind;
+import com.oracle.jvmci.meta.AllocatableValue;
+import com.oracle.jvmci.meta.Kind;
+
+import static com.oracle.jvmci.amd64.AMD64.*;
+
+import java.util.*;
+
+import com.oracle.jvmci.code.CallingConvention.Type;
+import com.oracle.jvmci.common.*;
+import com.oracle.jvmci.hotspot.*;
+
+public class AMD64HotSpotRegisterConfig implements RegisterConfig {
+
+    private final Architecture architecture;
+
+    private final Register[] allocatable;
+
+    private final int maxFrameSize;
+
+    /**
+     * The caller saved registers always include all parameter registers.
+     */
+    private final Register[] callerSaved;
+
+    private final boolean allAllocatableAreCallerSaved;
+
+    private final RegisterAttributes[] attributesMap;
+
+    public int getMaximumFrameSize() {
+        return maxFrameSize;
+    }
+
+    @Override
+    public Register[] getAllocatableRegisters() {
+        return allocatable.clone();
+    }
+
+    public Register[] filterAllocatableRegisters(PlatformKind kind, Register[] registers) {
+        ArrayList<Register> list = new ArrayList<>();
+        for (Register reg : registers) {
+            if (architecture.canStoreValue(reg.getRegisterCategory(), kind)) {
+                list.add(reg);
+            }
+        }
+
+        Register[] ret = list.toArray(new Register[list.size()]);
+        return ret;
+    }
+
+    @Override
+    public RegisterAttributes[] getAttributesMap() {
+        return attributesMap.clone();
+    }
+
+    private final Register[] javaGeneralParameterRegisters;
+    private final Register[] nativeGeneralParameterRegisters;
+    private final Register[] xmmParameterRegisters = {xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7};
+
+    /*
+     * Some ABIs (e.g. Windows) require a so-called "home space", that is a save area on the stack
+     * to store the argument registers
+     */
+    private final boolean needsNativeStackHomeSpace;
+
+    private final CalleeSaveLayout csl;
+
+    private static Register[] initAllocatable(boolean reserveForHeapBase) {
+        Register[] registers = null;
+        // @formatter:off
+        if (reserveForHeapBase) {
+            registers = new Register[] {
+                        rax, rbx, rcx, rdx, /*rsp,*/ rbp, rsi, rdi, r8, r9,  r10, r11, /*r12,*/ r13, r14, /*r15, */
+                        xmm0, xmm1, xmm2,  xmm3,  xmm4,  xmm5,  xmm6,  xmm7,
+                        xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15
+                      };
+        } else {
+            registers = new Register[] {
+                        rax, rbx, rcx, rdx, /*rsp,*/ rbp, rsi, rdi, r8, r9,  r10, r11, r12, r13, r14, /*r15, */
+                        xmm0, xmm1, xmm2,  xmm3,  xmm4,  xmm5,  xmm6,  xmm7,
+                        xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15
+                      };
+        }
+       // @formatter:on
+        return registers;
+    }
+
+    public AMD64HotSpotRegisterConfig(Architecture architecture, HotSpotVMConfig config) {
+        this(architecture, config, initAllocatable(config.useCompressedOops));
+        assert callerSaved.length >= allocatable.length;
+    }
+
+    public AMD64HotSpotRegisterConfig(Architecture architecture, HotSpotVMConfig config, Register[] allocatable) {
+        this.architecture = architecture;
+        this.maxFrameSize = config.maxFrameSize;
+
+        if (config.windowsOs) {
+            javaGeneralParameterRegisters = new Register[]{rdx, r8, r9, rdi, rsi, rcx};
+            nativeGeneralParameterRegisters = new Register[]{rcx, rdx, r8, r9};
+            this.needsNativeStackHomeSpace = true;
+        } else {
+            javaGeneralParameterRegisters = new Register[]{rsi, rdx, rcx, r8, r9, rdi};
+            nativeGeneralParameterRegisters = new Register[]{rdi, rsi, rdx, rcx, r8, r9};
+            this.needsNativeStackHomeSpace = false;
+        }
+
+        csl = null;
+        this.allocatable = allocatable.clone();
+        Set<Register> callerSaveSet = new HashSet<>();
+        Collections.addAll(callerSaveSet, allocatable);
+        Collections.addAll(callerSaveSet, xmmParameterRegisters);
+        Collections.addAll(callerSaveSet, javaGeneralParameterRegisters);
+        Collections.addAll(callerSaveSet, nativeGeneralParameterRegisters);
+        callerSaved = callerSaveSet.toArray(new Register[callerSaveSet.size()]);
+
+        allAllocatableAreCallerSaved = true;
+        attributesMap = RegisterAttributes.createMap(this, AMD64.allRegisters);
+    }
+
+    @Override
+    public Register[] getCallerSaveRegisters() {
+        return callerSaved;
+    }
+
+    @Override
+    public boolean areAllAllocatableRegistersCallerSaved() {
+        return allAllocatableAreCallerSaved;
+    }
+
+    @Override
+    public Register getRegisterForRole(int index) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public CallingConvention getCallingConvention(Type type, JavaType returnType, JavaType[] parameterTypes, TargetDescription target, boolean stackOnly) {
+        if (type == Type.NativeCall) {
+            return callingConvention(nativeGeneralParameterRegisters, returnType, parameterTypes, type, target, stackOnly);
+        }
+        // On x64, parameter locations are the same whether viewed
+        // from the caller or callee perspective
+        return callingConvention(javaGeneralParameterRegisters, returnType, parameterTypes, type, target, stackOnly);
+    }
+
+    public Register[] getCallingConventionRegisters(Type type, Kind kind) {
+        if (architecture.canStoreValue(XMM, kind)) {
+            return xmmParameterRegisters;
+        }
+        assert architecture.canStoreValue(CPU, kind);
+        return type == Type.NativeCall ? nativeGeneralParameterRegisters : javaGeneralParameterRegisters;
+    }
+
+    private CallingConvention callingConvention(Register[] generalParameterRegisters, JavaType returnType, JavaType[] parameterTypes, Type type, TargetDescription target, boolean stackOnly) {
+        AllocatableValue[] locations = new AllocatableValue[parameterTypes.length];
+
+        int currentGeneral = 0;
+        int currentXMM = 0;
+        int currentStackOffset = type == Type.NativeCall && needsNativeStackHomeSpace ? generalParameterRegisters.length * target.wordSize : 0;
+
+        for (int i = 0; i < parameterTypes.length; i++) {
+            final Kind kind = parameterTypes[i].getKind();
+
+            switch (kind) {
+                case Byte:
+                case Boolean:
+                case Short:
+                case Char:
+                case Int:
+                case Long:
+                case Object:
+                    if (!stackOnly && currentGeneral < generalParameterRegisters.length) {
+                        Register register = generalParameterRegisters[currentGeneral++];
+                        locations[i] = register.asValue(target.getLIRKind(kind));
+                    }
+                    break;
+                case Float:
+                case Double:
+                    if (!stackOnly && currentXMM < xmmParameterRegisters.length) {
+                        Register register = xmmParameterRegisters[currentXMM++];
+                        locations[i] = register.asValue(target.getLIRKind(kind));
+                    }
+                    break;
+                default:
+                    throw JVMCIError.shouldNotReachHere();
+            }
+
+            if (locations[i] == null) {
+                locations[i] = StackSlot.get(target.getLIRKind(kind.getStackKind()), currentStackOffset, !type.out);
+                currentStackOffset += Math.max(target.getSizeInBytes(kind), target.wordSize);
+            }
+        }
+
+        Kind returnKind = returnType == null ? Kind.Void : returnType.getKind();
+        AllocatableValue returnLocation = returnKind == Kind.Void ? Value.ILLEGAL : getReturnRegister(returnKind).asValue(target.getLIRKind(returnKind.getStackKind()));
+        return new CallingConvention(currentStackOffset, returnLocation, locations);
+    }
+
+    @Override
+    public Register getReturnRegister(Kind kind) {
+        switch (kind) {
+            case Boolean:
+            case Byte:
+            case Char:
+            case Short:
+            case Int:
+            case Long:
+            case Object:
+                return rax;
+            case Float:
+            case Double:
+                return xmm0;
+            case Void:
+            case Illegal:
+                return null;
+            default:
+                throw new UnsupportedOperationException("no return register for type " + kind);
+        }
+    }
+
+    @Override
+    public Register getFrameRegister() {
+        return rsp;
+    }
+
+    public CalleeSaveLayout getCalleeSaveLayout() {
+        return csl;
+    }
+
+    @Override
+    public String toString() {
+        return String.format("Allocatable: " + Arrays.toString(getAllocatableRegisters()) + "%n" + "CallerSave:  " + Arrays.toString(getCallerSaveRegisters()) + "%n");
+    }
+}