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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ConvertNode.java @ 22054:0e095e2c24e2

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Rename com.oracle.jvmci to jdk.internal.jvmci
author twisti
date Mon, 22 Jun 2015 12:12:53 -0700
parents 48c1ebd24120
children 7b4a47fcc4c0
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1 /*
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2 * Copyright (c) 2014, 2014, 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.oracle.graal.nodes.calc;
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24
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25 import jdk.internal.jvmci.code.*;
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26 import jdk.internal.jvmci.meta.*;
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27
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28 import com.oracle.graal.compiler.common.calc.*;
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29 import com.oracle.graal.graph.*;
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30 import com.oracle.graal.nodes.*;
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31
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32 /**
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33 * Represents a conversion between primitive types.
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34 */
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35 public interface ConvertNode extends ArithmeticOperation, NodeInterface {
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36
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37 ValueNode getValue();
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38
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39 Constant convert(Constant c, ConstantReflectionProvider constantReflection);
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40
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41 Constant reverse(Constant c, ConstantReflectionProvider constantReflection);
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42
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43 /**
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44 * Check whether a conversion is lossless.
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45 *
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46 * @return true iff reverse(convert(c)) == c for all c
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47 */
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48 boolean isLossless();
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49
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50 /**
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51 * Check whether a conversion preserves comparison order.
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52 *
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53 * @param op a comparison operator
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54 * @return true iff (c1 op c2) == (convert(c1) op convert(c2)) for all c1, c2
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55 */
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56 default boolean preservesOrder(Condition op) {
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57 return isLossless();
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58 }
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59
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60 /**
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61 * Check whether a conversion preserves comparison order against a particular constant value.
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62 *
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63 * @param op a comparison operator
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64 * @param value
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65 * @param constantReflection
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66 * @return true iff (c1 op value) == (convert(c1) op convert(value)) for value and all c1
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67 */
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68 default boolean preservesOrder(Condition op, Constant value, ConstantReflectionProvider constantReflection) {
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69 return preservesOrder(op);
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70 }
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71
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72 ValueNode asNode();
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73 }