--- /dev/null 2015-10-08 07:24:48.000000000 -1000 +++ new/src/jdk.vm.ci/share/classes/jdk.vm.ci.code/src/jdk/vm/ci/code/Architecture.java 2015-10-08 07:24:47.000000000 -1000 @@ -0,0 +1,225 @@ +/* + * Copyright (c) 2009, 2015, 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 java.nio.*; +import java.util.*; + +import jdk.vm.ci.code.Register.RegisterCategory; +import jdk.vm.ci.meta.*; + +/** + * Represents a CPU architecture, including information such as its endianness, CPU registers, word + * width, etc. + */ +public abstract class Architecture { + + /** + * The number of entries required in a {@link ReferenceMap} covering all the registers that may + * store references. The index of a register in the reference map is given by + * {@link Register#getReferenceMapIndex()}. + */ + private final int registerReferenceMapSize; + + /** + * The architecture specific type of a native word. + */ + private final PlatformKind wordKind; + + /** + * The name of this architecture (e.g. "AMD64", "SPARCv9"). + */ + private final String name; + + /** + * Array of all available registers on this architecture. The index of each register in this + * array is equal to its {@linkplain Register#number number}. + */ + private final Register[] registers; + + /** + * The byte ordering can be either little or big endian. + */ + private final ByteOrder byteOrder; + + /** + * Whether the architecture supports unaligned memory accesses. + */ + private final boolean unalignedMemoryAccess; + + /** + * Mask of the barrier constants denoting the barriers that are not required to be explicitly + * inserted under this architecture. + */ + private final int implicitMemoryBarriers; + + /** + * Offset in bytes from the beginning of a call instruction to the displacement. + */ + private final int machineCodeCallDisplacementOffset; + + /** + * The size of the return address pushed to the stack by a call instruction. A value of 0 + * denotes that call linkage uses registers instead (e.g. SPARC). + */ + private final int returnAddressSize; + + protected Architecture(String name, PlatformKind wordKind, ByteOrder byteOrder, boolean unalignedMemoryAccess, Register[] registers, int implicitMemoryBarriers, int nativeCallDisplacementOffset, + int registerReferenceMapSize, int returnAddressSize) { + this.name = name; + this.registers = registers; + this.wordKind = wordKind; + this.byteOrder = byteOrder; + this.unalignedMemoryAccess = unalignedMemoryAccess; + this.implicitMemoryBarriers = implicitMemoryBarriers; + this.machineCodeCallDisplacementOffset = nativeCallDisplacementOffset; + this.registerReferenceMapSize = registerReferenceMapSize; + this.returnAddressSize = returnAddressSize; + } + + /** + * Converts this architecture to a string. + * + * @return the string representation of this architecture + */ + @Override + public final String toString() { + return getName().toLowerCase(); + } + + public int getRegisterReferenceMapSize() { + return registerReferenceMapSize; + } + + /** + * Gets the natural size of words (typically registers and pointers) of this architecture, in + * bytes. + */ + public int getWordSize() { + return wordKind.getSizeInBytes(); + } + + public PlatformKind getWordKind() { + return wordKind; + } + + /** + * Gets the name of this architecture. + */ + public String getName() { + return name; + } + + /** + * Gets an array of all available registers on this architecture. The index of each register in + * this array is equal to its {@linkplain Register#number number}. + */ + public Register[] getRegisters() { + return registers.clone(); + } + + public ByteOrder getByteOrder() { + return byteOrder; + } + + /** + * @return true if the architecture supports unaligned memory accesses. + */ + public boolean supportsUnalignedMemoryAccess() { + return unalignedMemoryAccess; + } + + /** + * Gets the size of the return address pushed to the stack by a call instruction. A value of 0 + * denotes that call linkage uses registers instead. + */ + public int getReturnAddressSize() { + return returnAddressSize; + } + + /** + * Gets the offset in bytes from the beginning of a call instruction to the displacement. + */ + public int getMachineCodeCallDisplacementOffset() { + return machineCodeCallDisplacementOffset; + } + + /** + * Determines the barriers in a given barrier mask that are explicitly required on this + * architecture. + * + * @param barriers a mask of the barrier constants + * @return the value of {@code barriers} minus the barriers unnecessary on this architecture + */ + public final int requiredBarriers(int barriers) { + return barriers & ~implicitMemoryBarriers; + } + + /** + * Determine whether a kind can be stored in a register of a given category. + * + * @param category the category of the register + * @param kind the kind that should be stored in the register + */ + public abstract boolean canStoreValue(RegisterCategory category, PlatformKind kind); + + /** + * Return the largest kind that can be stored in a register of a given category. + * + * @param category the category of the register + * @return the largest kind that can be stored in a register {@code category} + */ + public abstract PlatformKind getLargestStorableKind(RegisterCategory category); + + /** + * Return the {@link PlatformKind} that is used to store values of a given {@link JavaKind}. + */ + public abstract PlatformKind getPlatformKind(JavaKind javaKind); + + @Override + public final boolean equals(Object obj) { + if (obj == this) { + return true; + } + if (obj instanceof Architecture) { + Architecture that = (Architecture) obj; + if (this.name.equals(that.name)) { + assert this.byteOrder.equals(that.byteOrder); + assert this.implicitMemoryBarriers == that.implicitMemoryBarriers; + assert this.machineCodeCallDisplacementOffset == that.machineCodeCallDisplacementOffset; + assert this.registerReferenceMapSize == that.registerReferenceMapSize; + assert Arrays.equals(this.registers, that.registers); + assert this.returnAddressSize == that.returnAddressSize; + assert this.unalignedMemoryAccess == that.unalignedMemoryAccess; + assert this.wordKind == that.wordKind; + return true; + } + } + return false; + } + + @Override + public final int hashCode() { + return name.hashCode(); + } +}