Mercurial > hg > graal-jvmci-8
view graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/Architecture.java @ 13726:343541fb3b49
Support narrow oops in reference maps.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Wed, 22 Jan 2014 11:44:27 +0100 |
parents | 94ec1122be13 |
children | d8ac61f39968 |
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/* * Copyright (c) 2009, 2011, 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.graal.api.code; import java.nio.*; import com.oracle.graal.api.code.Register.RegisterCategory; import com.oracle.graal.api.meta.*; /** * Represents a CPU architecture, including information such as its endianness, CPU registers, word * width, etc. */ public abstract class Architecture { /** * The number of bits required in a bit map covering all the registers that may store * references. The bit position of a register in the map is the register's * {@linkplain Register#number number}. */ private final int registerReferenceMapBitCount; /** * Represents the natural size of words (typically registers and pointers) of this architecture, * in bytes. */ private final int wordSize; /** * 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, int wordSize, ByteOrder byteOrder, boolean unalignedMemoryAccess, Register[] registers, int implicitMemoryBarriers, int nativeCallDisplacementOffset, int registerReferenceMapBitCount, int returnAddressSize) { this.name = name; this.registers = registers; this.wordSize = wordSize; this.byteOrder = byteOrder; this.unalignedMemoryAccess = unalignedMemoryAccess; this.implicitMemoryBarriers = implicitMemoryBarriers; this.machineCodeCallDisplacementOffset = nativeCallDisplacementOffset; this.registerReferenceMapBitCount = registerReferenceMapBitCount; 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 getRegisterReferenceMapBitCount() { return registerReferenceMapBitCount; } /** * Gets the natural size of words (typically registers and pointers) of this architecture, in * bytes. */ public int getWordSize() { return wordSize; } /** * 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 the maximum vector length supported for vector operations on values of a given * {@link Kind}. * * @param kind the kind of the individual vector elements * @return the maximum supported vector size */ public int getMaxVectorLength(Kind kind) { return 1; } /** * Get a natively supported vector length for breaking down some vector operation on a constant * length vector. * * @param kind the kind of the individual vector elements * @param maxLength the maximum length that should be returned * @param arithmetic the arithmetic operation for which the vector size should be determined, or * null if no arithmetic needs to be performed on the vector * @return a supported vector size, but at most {@code maxLength} */ public int getSupportedVectorLength(Kind kind, int maxLength, Class<? extends ArithmeticOperation> arithmetic) { return 1; } /** * Gets the size in bytes of the specified kind for this target. * * @param kind the kind for which to get the size * * @return the size in bytes of {@code kind} */ public int getSizeInBytes(PlatformKind kind) { switch ((Kind) kind) { case Boolean: return 1; case Byte: return 1; case Char: return 2; case Short: return 2; case Int: return 4; case Long: return 8; case Float: return 4; case Double: return 8; case Object: return wordSize; case NarrowOop: return wordSize / 2; default: return 0; } } /** * 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); }