1 /* 2 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.graalvm.compiler.lir.stackslotalloc; 24 25 import org.graalvm.compiler.lir.VirtualStackSlot; 26 27 import jdk.vm.ci.code.StackSlot; 28 import jdk.vm.ci.meta.ValueKind; 29 30 public final class StackInterval { 31 32 private static final int INVALID_START = Integer.MAX_VALUE; 33 private static final int INVALID_END = Integer.MIN_VALUE; 34 private final VirtualStackSlot operand; 35 private StackInterval hint; 36 private final ValueKind<?> kind; 37 private int from = INVALID_START; 38 private int to = INVALID_END; 39 private StackSlot location; 40 41 public StackInterval(VirtualStackSlot operand, ValueKind<?> kind) { 42 this.operand = operand; 43 this.kind = kind; 44 } 45 46 public boolean verify(int maxOpId) { 47 // maxOpId + 1 is the last position in the last block (i.e. the "write position") 48 assert 0 <= from && from <= to && to <= maxOpId + 1 : String.format("from %d, to %d, maxOpId %d", from, to, maxOpId); 49 return true; 50 } 51 52 public VirtualStackSlot getOperand() { 53 return operand; 54 } 55 56 public void addTo(int opId) { 57 if (opId >= to) { 58 to = opId; 59 } 60 } 61 62 protected void addFrom(int opId) { 63 if (from > opId) { 64 from = opId; 65 // set opId also as to if it has not yet been set 66 if (to == INVALID_END) { 67 to = opId; 68 } 69 } 70 } 71 72 public ValueKind<?> kind() { 73 return kind; 74 } 75 76 public StackSlot location() { 77 return location; 78 } 79 80 public void setLocation(StackSlot location) { 81 this.location = location; 82 } 83 84 public int from() { 85 return from; 86 } 87 88 public int to() { 89 return to; 90 } 91 92 public void fixFrom() { 93 if (from == INVALID_START) { 94 from = 0; 95 } 96 } 97 98 public boolean isFixed() { 99 return from == 0; 100 } 101 102 @Override 103 public String toString() { 104 return String.format("SI[%d-%d] k=%s o=%s l=%s h=%s", from, to, kind, operand, location, hint != null ? hint.getOperand() : "null"); 105 } 106 107 public void setLocationHint(StackInterval locationHint) { 108 hint = locationHint; 109 } 110 111 public StackInterval locationHint() { 112 return hint; 113 } 114 115 }