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annotate graal/com.oracle.max.base/src/com/sun/max/lang/ISA.java @ 4184:fa6b78681c54

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Added copyright check to the gate.
author Doug Simon <doug.simon@oracle.com>
date Tue, 03 Jan 2012 12:37:31 +0100
parents e233f5660da4
children
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1 /*
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.max.lang;
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24
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25 /**
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26 * Instruction Set Architecture monikers.
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27 */
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28 public enum ISA {
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29
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30 AMD64(Category.CISC, 0, false, 0),
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31 ARM(Category.RISC, 4, false, 0),
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32 IA32(Category.CISC, 0, false, 0),
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33 PPC(Category.RISC, 4, true, 0),
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34 SPARC(Category.RISC, 4, true, 8);
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35
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36 public enum Category {
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37 CISC, RISC;
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38 }
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39
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40 public final Category category;
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41
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42 /**
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43 * True if PC-relative control transfer instructions contain an offset relative to the start of the instruction.
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44 * False if PC-relative control transfer instructions contain an offset relative to the end of the instruction.
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45 */
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46 public final boolean relativeBranchFromStart;
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47
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48 /**
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49 * Offset to the return address of the caller from the caller's saved PC.
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50 * For example, a SPARC call instruction saves its address in %o7. The return address is typically 2 instructions after
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51 * (to account for the call instruction itself and the delay slot).
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52 */
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53 public final int offsetToReturnPC;
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54
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55 /**
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56 * Width of an instruction (in bytes).
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57 * If instructions are of variable width, this field is zero.
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58 */
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59 public final int instructionWidth;
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60
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61 private ISA(Category category, int instructionWidth, boolean relativeBranchFromStart, int offsetToReturnPC) {
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62 this.category = category;
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63 this.instructionWidth = instructionWidth;
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64 this.relativeBranchFromStart = relativeBranchFromStart;
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65 this.offsetToReturnPC = offsetToReturnPC;
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66 }
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67
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68 @Override
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69 public String toString() {
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70 return name();
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71 }
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72
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73 /**
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74 * Determines if call instructions in this instruction set push the return address on the stack.
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75 */
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76 public boolean callsPushReturnAddressOnStack() {
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77 return category == Category.CISC;
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78 }
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79
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80 }