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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 java.io.PrintStream; | |
| 31 | +import java.util.Hashtable; | |
| 32 | + | |
| 33 | +/** | |
| 34 | + * WARNING: The contents of this source file are not part of any | |
| 35 | + * supported API. Code that depends on them does so at its own risk: | |
| 36 | + * they are subject to change or removal without notice. | |
| 37 | + */ | |
| 38 | +public | |
| 39 | +class ThisExpression extends Expression { | |
| 40 | + LocalMember field; | |
| 41 | + Expression implementation; | |
| 42 | + Expression outerArg; | |
| 43 | + | |
| 44 | + /** | |
| 45 | + * Constructor | |
| 46 | + */ | |
| 47 | + public ThisExpression(long where) { | |
| 48 | + super(THIS, where, Type.tObject); | |
| 49 | + } | |
| 50 | + protected ThisExpression(int op, long where) { | |
| 51 | + super(op, where, Type.tObject); | |
| 52 | + } | |
| 53 | + public ThisExpression(long where, LocalMember field) { | |
| 54 | + super(THIS, where, Type.tObject); | |
| 55 | + this.field = field; | |
| 56 | + field.readcount++; | |
| 57 | + } | |
| 58 | + public ThisExpression(long where, Context ctx) { | |
| 59 | + super(THIS, where, Type.tObject); | |
| 60 | + field = ctx.getLocalField(idThis); | |
| 61 | + field.readcount++; | |
| 62 | + } | |
| 63 | + | |
| 64 | + /** | |
| 65 | + * Constructor for "x.this()" | |
| 66 | + */ | |
| 67 | + public ThisExpression(long where, Expression outerArg) { | |
| 68 | + this(where); | |
| 69 | + this.outerArg = outerArg; | |
| 70 | + } | |
| 71 | + | |
| 72 | + public Expression getImplementation() { | |
| 73 | + if (implementation != null) | |
| 74 | + return implementation; | |
| 75 | + return this; | |
| 76 | + } | |
| 77 | + | |
| 78 | + /** | |
| 79 | + * From the 'this' in an expression of the form outer.this(...), | |
| 80 | + * or the 'super' in an expression of the form outer.super(...), | |
| 81 | + * return the "outer" expression, or null if there is none. | |
| 82 | + */ | |
| 83 | + public Expression getOuterArg() { | |
| 84 | + return outerArg; | |
| 85 | + } | |
| 86 | + | |
| 87 | + /** | |
| 88 | + * Check expression | |
| 89 | + */ | |
| 90 | + public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable exp) { | |
| 91 | + if (ctx.field.isStatic()) { | |
| 92 | + env.error(where, "undef.var", opNames[op]); | |
| 93 | + type = Type.tError; | |
| 94 | + return vset; | |
| 95 | + } | |
| 96 | + if (field == null) { | |
| 97 | + field = ctx.getLocalField(idThis); | |
| 98 | + field.readcount++; | |
| 99 | + } | |
| 100 | + if (field.scopeNumber < ctx.frameNumber) { | |
| 101 | + // get a "this$C" copy via the current object | |
| 102 | + implementation = ctx.makeReference(env, field); | |
| 103 | + } | |
| 104 | + if (!vset.testVar(field.number)) { | |
| 105 | + env.error(where, "access.inst.before.super", opNames[op]); | |
| 106 | + } | |
| 107 | + if (field == null) { | |
| 108 | + type = ctx.field.getClassDeclaration().getType(); | |
| 109 | + } else { | |
| 110 | + type = field.getType(); | |
| 111 | + } | |
| 112 | + return vset; | |
| 113 | + } | |
| 114 | + | |
| 115 | + public boolean isNonNull() { | |
| 116 | + return true; | |
| 117 | + } | |
| 118 | + | |
| 119 | + // A 'ThisExpression' node can never appear on the LHS of an assignment in a correct | |
| 120 | + // program, but handle this case anyhow to provide a safe error recovery. | |
| 121 | + | |
| 122 | + public FieldUpdater getAssigner(Environment env, Context ctx) { | |
| 123 | + return null; | |
| 124 | + } | |
| 125 | + | |
| 126 | + public FieldUpdater getUpdater(Environment env, Context ctx) { | |
| 127 | + return null; | |
| 128 | + } | |
| 129 | + | |
| 130 | + /** | |
| 131 | + * Inline | |
| 132 | + */ | |
| 133 | + public Expression inlineValue(Environment env, Context ctx) { | |
| 134 | + if (implementation != null) | |
| 135 | + return implementation.inlineValue(env, ctx); | |
| 136 | + if (field != null && field.isInlineable(env, false)) { | |
| 137 | + Expression e = (Expression)field.getValue(env); | |
| 138 | + //System.out.println("INLINE = "+ e + ", THIS"); | |
| 139 | + if (e != null) { | |
| 140 | + e = e.copyInline(ctx); | |
| 141 | + e.type = type; // in case op==SUPER | |
| 142 | + return e; | |
| 143 | + } | |
| 144 | + } | |
| 145 | + return this; | |
| 146 | + } | |
| 147 | + | |
| 148 | + /** | |
| 149 | + * Create a copy of the expression for method inlining | |
| 150 | + */ | |
| 151 | + public Expression copyInline(Context ctx) { | |
| 152 | + if (implementation != null) | |
| 153 | + return implementation.copyInline(ctx); | |
| 154 | + ThisExpression e = (ThisExpression)clone(); | |
| 155 | + if (field == null) { | |
| 156 | + // The expression is copied into the context of a method | |
| 157 | + e.field = ctx.getLocalField(idThis); | |
| 158 | + e.field.readcount++; | |
| 159 | + } else { | |
| 160 | + e.field = field.getCurrentInlineCopy(ctx); | |
| 161 | + } | |
| 162 | + if (outerArg != null) { | |
| 163 | + e.outerArg = outerArg.copyInline(ctx); | |
| 164 | + } | |
| 165 | + return e; | |
| 166 | + } | |
| 167 | + | |
| 168 | + /** | |
| 169 | + * Code | |
| 170 | + */ | |
| 171 | + public void codeValue(Environment env, Context ctx, Assembler asm) { | |
| 172 | + asm.add(where, opc_aload, new Integer(field.number)); | |
| 173 | + } | |
| 174 | + | |
| 175 | + /** | |
| 176 | ||
| 177 | + */ | |
| 178 | + public void print(PrintStream out) { | |
| 179 | + if (outerArg != null) { | |
| 180 | + out.print("(outer="); | |
| 181 | + outerArg.print(out); | |
| 182 | + out.print(" "); | |
| 183 | + } | |
| 184 | + String pfx = (field == null) ? "" | |
| 185 | + : field.getClassDefinition().getName().getFlatName().getName()+"."; | |
| 186 | + pfx += opNames[op]; | |
| 187 | + out.print(pfx + "#" + ((field != null) ? field.hashCode() : 0)); | |
| 188 | + if (outerArg != null) | |
| 189 | + out.print(")"); | |
| 190 | + } | |
| 191 | +} | |