Showing the changes to java/pkg/sun/tools/tree/CastExpression.java (1 of 18352 files). Show all
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| 1 | +/* | |
| 2 | + * Copyright (c) 1994, 2003, 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. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.tools.tree; | |
| 27 | + | |
| 28 | +import sun.tools.java.*; | |
| 29 | +import sun.tools.asm.Assembler; | |
| 30 | +import sun.tools.asm.Label; | |
| 31 | +import java.io.PrintStream; | |
| 32 | +import java.util.Hashtable; | |
| 33 | + | |
| 34 | +/** | |
| 35 | + * WARNING: The contents of this source file are not part of any | |
| 36 | + * supported API. Code that depends on them does so at its own risk: | |
| 37 | + * they are subject to change or removal without notice. | |
| 38 | + */ | |
| 39 | +public | |
| 40 | +class CastExpression extends BinaryExpression { | |
| 41 | + /** | |
| 42 | + * constructor | |
| 43 | + */ | |
| 44 | + public CastExpression(long where, Expression left, Expression right) { | |
| 45 | + super(CAST, where, left.type, left, right); | |
| 46 | + } | |
| 47 | + | |
| 48 | + /** | |
| 49 | + * Check the expression | |
| 50 | + */ | |
| 51 | + public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable exp) { | |
| 52 | + type = left.toType(env, ctx); | |
| 53 | + vset = right.checkValue(env, ctx, vset, exp); | |
| 54 | + | |
| 55 | + if (type.isType(TC_ERROR) || right.type.isType(TC_ERROR)) { | |
| 56 | + // An error was already reported | |
| 57 | + return vset; | |
| 58 | + } | |
| 59 | + | |
| 60 | + if (type.equals(right.type)) { | |
| 61 | + // The types are already the same | |
| 62 | + return vset; | |
| 63 | + } | |
| 64 | + | |
| 65 | + try { | |
| 66 | + if (env.explicitCast(right.type, type)) { | |
| 67 | + right = new ConvertExpression(where, type, right); | |
| 68 | + return vset; | |
| 69 | + } | |
| 70 | + } catch (ClassNotFound e) { | |
| 71 | + env.error(where, "class.not.found", e.name, opNames[op]); | |
| 72 | + } | |
| 73 | + | |
| 74 | + // The cast is not allowed | |
| 75 | + env.error(where, "invalid.cast", right.type, type); | |
| 76 | + return vset; | |
| 77 | + } | |
| 78 | + | |
| 79 | + /** | |
| 80 | + * Check if constant | |
| 81 | + */ | |
| 82 | + public boolean isConstant() { | |
| 83 | + if (type.inMask(TM_REFERENCE) && !type.equals(Type.tString)) { | |
| 84 | + // must be a primitive type, or String | |
| 85 | + return false; | |
| 86 | + } | |
| 87 | + return right.isConstant(); | |
| 88 | + } | |
| 89 | + | |
| 90 | + /** | |
| 91 | + * Inline | |
| 92 | + */ | |
| 93 | + public Expression inline(Environment env, Context ctx) { | |
| 94 | + return right.inline(env, ctx); | |
| 95 | + } | |
| 96 | + public Expression inlineValue(Environment env, Context ctx) { | |
| 97 | + return right.inlineValue(env, ctx); | |
| 98 | + } | |
| 99 | + | |
| 100 | + | |
| 101 | + public int costInline(int thresh, Environment env, Context ctx) { | |
| 102 | + if (ctx == null) { | |
| 103 | + return 1 + right.costInline(thresh, env, ctx); | |
| 104 | + } | |
| 105 | + // sourceClass is the current class trying to inline this method | |
| 106 | + ClassDefinition sourceClass = ctx.field.getClassDefinition(); | |
| 107 | + try { | |
| 108 | + // We only allow the inlining if the current class can access | |
| 109 | + // the casting class | |
| 110 | + if (left.type.isType(TC_ARRAY) || | |
| 111 | + sourceClass.permitInlinedAccess(env, | |
| 112 | + env.getClassDeclaration(left.type))) | |
| 113 | + return 1 + right.costInline(thresh, env, ctx); | |
| 114 | + } catch (ClassNotFound e) { | |
| 115 | + } | |
| 116 | + return thresh; | |
| 117 | + } | |
| 118 | + | |
| 119 | + | |
| 120 | + | |
| 121 | + /** | |
| 122 | ||
| 123 | + */ | |
| 124 | + public void print(PrintStream out) { | |
| 125 | + out.print("(" + opNames[op] + " "); | |
| 126 | + if (type.isType(TC_ERROR)) { | |
| 127 | + left.print(out); | |
| 128 | + } else { | |
| 129 | + out.print(type); | |
| 130 | + } | |
| 131 | + out.print(" "); | |
| 132 | + right.print(out); | |
| 133 | + out.print(")"); | |
| 134 | + } | |
| 135 | +} | |