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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 | } | ||