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view graal/com.oracle.max.base/src/com/sun/max/lang/ISA.java @ 4231:d713eaf4d288
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author | Christian Wimmer <Christian.Wimmer@Oracle.com> |
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date | Thu, 05 Jan 2012 16:09:47 -0800 |
parents | e233f5660da4 |
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/* * Copyright (c) 2007, 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.sun.max.lang; /** * Instruction Set Architecture monikers. */ public enum ISA { AMD64(Category.CISC, 0, false, 0), ARM(Category.RISC, 4, false, 0), IA32(Category.CISC, 0, false, 0), PPC(Category.RISC, 4, true, 0), SPARC(Category.RISC, 4, true, 8); public enum Category { CISC, RISC; } public final Category category; /** * True if PC-relative control transfer instructions contain an offset relative to the start of the instruction. * False if PC-relative control transfer instructions contain an offset relative to the end of the instruction. */ public final boolean relativeBranchFromStart; /** * Offset to the return address of the caller from the caller's saved PC. * For example, a SPARC call instruction saves its address in %o7. The return address is typically 2 instructions after * (to account for the call instruction itself and the delay slot). */ public final int offsetToReturnPC; /** * Width of an instruction (in bytes). * If instructions are of variable width, this field is zero. */ public final int instructionWidth; private ISA(Category category, int instructionWidth, boolean relativeBranchFromStart, int offsetToReturnPC) { this.category = category; this.instructionWidth = instructionWidth; this.relativeBranchFromStart = relativeBranchFromStart; this.offsetToReturnPC = offsetToReturnPC; } @Override public String toString() { return name(); } /** * Determines if call instructions in this instruction set push the return address on the stack. */ public boolean callsPushReturnAddressOnStack() { return category == Category.CISC; } }