J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1994-2003 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any 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 InstanceOfExpression extends BinaryExpression { |
| 41 | /** |
| 42 | * constructor |
| 43 | */ |
| 44 | public InstanceOfExpression(long where, Expression left, Expression right) { |
| 45 | super(INSTANCEOF, where, Type.tBoolean, left, right); |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * Check the expression |
| 50 | */ |
| 51 | public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable exp) { |
| 52 | vset = left.checkValue(env, ctx, vset, exp); |
| 53 | right = new TypeExpression(right.where, right.toType(env, ctx)); |
| 54 | |
| 55 | if (right.type.isType(TC_ERROR) || left.type.isType(TC_ERROR)) { |
| 56 | // An error was already reported |
| 57 | return vset; |
| 58 | } |
| 59 | |
| 60 | if (!right.type.inMask(TM_CLASS|TM_ARRAY)) { |
| 61 | env.error(right.where, "invalid.arg.type", right.type, opNames[op]); |
| 62 | return vset; |
| 63 | } |
| 64 | try { |
| 65 | if (!env.explicitCast(left.type, right.type)) { |
| 66 | env.error(where, "invalid.instanceof", left.type, right.type); |
| 67 | } |
| 68 | } catch (ClassNotFound e) { |
| 69 | env.error(where, "class.not.found", e.name, opNames[op]); |
| 70 | } |
| 71 | return vset; |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Inline |
| 76 | */ |
| 77 | public Expression inline(Environment env, Context ctx) { |
| 78 | return left.inline(env, ctx); |
| 79 | } |
| 80 | public Expression inlineValue(Environment env, Context ctx) { |
| 81 | left = left.inlineValue(env, ctx); |
| 82 | return this; |
| 83 | } |
| 84 | |
| 85 | public int costInline(int thresh, Environment env, Context ctx) { |
| 86 | if (ctx == null) { |
| 87 | return 1 + left.costInline(thresh, env, ctx); |
| 88 | } |
| 89 | // sourceClass is the current class trying to inline this method |
| 90 | ClassDefinition sourceClass = ctx.field.getClassDefinition(); |
| 91 | try { |
| 92 | // We only allow the inlining if the current class can access |
| 93 | // the "instance of" class |
| 94 | if (right.type.isType(TC_ARRAY) || |
| 95 | sourceClass.permitInlinedAccess(env, env.getClassDeclaration(right.type))) |
| 96 | return 1 + left.costInline(thresh, env, ctx); |
| 97 | } catch (ClassNotFound e) { |
| 98 | } |
| 99 | return thresh; |
| 100 | } |
| 101 | |
| 102 | |
| 103 | |
| 104 | |
| 105 | /** |
| 106 | * Code |
| 107 | */ |
| 108 | public void codeValue(Environment env, Context ctx, Assembler asm) { |
| 109 | left.codeValue(env, ctx, asm); |
| 110 | if (right.type.isType(TC_CLASS)) { |
| 111 | asm.add(where, opc_instanceof, env.getClassDeclaration(right.type)); |
| 112 | } else { |
| 113 | asm.add(where, opc_instanceof, right.type); |
| 114 | } |
| 115 | } |
| 116 | void codeBranch(Environment env, Context ctx, Assembler asm, Label lbl, boolean whenTrue) { |
| 117 | codeValue(env, ctx, asm); |
| 118 | asm.add(where, whenTrue ? opc_ifne : opc_ifeq, lbl, whenTrue); |
| 119 | } |
| 120 | public void code(Environment env, Context ctx, Assembler asm) { |
| 121 | left.code(env, ctx, asm); |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Print |
| 126 | */ |
| 127 | public void print(PrintStream out) { |
| 128 | out.print("(" + opNames[op] + " "); |
| 129 | left.print(out); |
| 130 | out.print(" "); |
| 131 | if (right.op == TYPE) { |
| 132 | out.print(right.type.toString()); |
| 133 | } else { |
| 134 | right.print(out); |
| 135 | } |
| 136 | out.print(")"); |
| 137 | } |
| 138 | } |