| /* |
| * Copyright (c) 2009, 2016, 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 jdk.vm.ci.code; |
| |
| import jdk.vm.ci.code.CallingConvention.Type; |
| import jdk.vm.ci.meta.JavaKind; |
| import jdk.vm.ci.meta.JavaType; |
| import jdk.vm.ci.meta.PlatformKind; |
| import jdk.vm.ci.meta.ValueKind; |
| |
| /** |
| * A register configuration binds roles and {@linkplain RegisterAttributes attributes} to physical |
| * registers. |
| */ |
| public interface RegisterConfig { |
| |
| /** |
| * Gets the register to be used for returning a value of a given kind. |
| */ |
| Register getReturnRegister(JavaKind kind); |
| |
| /** |
| * Gets the maximum allowed size of the frame. |
| */ |
| default int getMaximumFrameSize() { |
| return Integer.MAX_VALUE; |
| } |
| |
| /** |
| * Gets the register used as the frame pointer. Spill slots and outgoing stack-based arguments |
| * are addressed relative to this register. |
| */ |
| Register getFrameRegister(); |
| |
| /** |
| * Gets the calling convention describing how arguments are passed. |
| * |
| * @param type the type of calling convention being requested |
| * @param returnType the return type (can be null for methods returning {@code void}) |
| * @param parameterTypes the types of the arguments of the call |
| * @param valueKindFactory the factory to create custom {@link ValueKind ValueKinds} |
| */ |
| CallingConvention getCallingConvention(Type type, JavaType returnType, JavaType[] parameterTypes, ValueKindFactory<?> valueKindFactory); |
| |
| /** |
| * Gets the ordered set of registers that are can be used to pass parameters according to a |
| * given calling convention. |
| * |
| * @param type the type of calling convention |
| * @param kind specifies what kind of registers is being requested |
| * @return the ordered set of registers that may be used to pass parameters in a call conforming |
| * to {@code type} |
| */ |
| RegisterArray getCallingConventionRegisters(Type type, JavaKind kind); |
| |
| /** |
| * Gets the set of all registers that might be used by the register allocator. |
| * |
| * To get the set of registers the register allocator is allowed to use see |
| * {@link RegisterAllocationConfig#getAllocatableRegisters()} |
| */ |
| @SuppressWarnings("javadoc") |
| RegisterArray getAllocatableRegisters(); |
| |
| /** |
| * Filters a set of registers and returns only those that can be used by the register allocator |
| * for a value of a particular kind. |
| */ |
| RegisterArray filterAllocatableRegisters(PlatformKind kind, RegisterArray registers); |
| |
| /** |
| * Gets the registers whose values must be preserved by a method across any call it makes. |
| */ |
| RegisterArray getCallerSaveRegisters(); |
| |
| /** |
| * Gets the registers whose values must be preserved by the callee. |
| */ |
| RegisterArray getCalleeSaveRegisters(); |
| |
| /** |
| * Gets a map from register {@linkplain Register#number numbers} to register |
| * {@linkplain RegisterAttributes attributes} for this register configuration. |
| * |
| * @return an array where an element at index i holds the attributes of the register whose |
| * number is i |
| */ |
| RegisterAttributes[] getAttributesMap(); |
| |
| /** |
| * Determines if all {@link #getAllocatableRegisters() allocatable} registers are |
| * {@link #getCallerSaveRegisters() caller saved}. |
| */ |
| boolean areAllAllocatableRegistersCallerSaved(); |
| } |