0N/A/*
2362N/A * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2362N/A * or visit www.oracle.com if you need additional information or have any
2362N/A * questions.
0N/A */
0N/A
0N/Apackage sun.tools.tree;
0N/A
0N/Aimport sun.tools.java.*;
0N/Aimport sun.tools.asm.Assembler;
0N/Aimport java.io.PrintStream;
0N/Aimport java.util.Hashtable;
0N/A
0N/A/**
0N/A * WARNING: The contents of this source file are not part of any
0N/A * supported API. Code that depends on them does so at its own risk:
0N/A * they are subject to change or removal without notice.
0N/A */
0N/Apublic
0N/Aclass ThisExpression extends Expression {
0N/A LocalMember field;
0N/A Expression implementation;
0N/A Expression outerArg;
0N/A
0N/A /**
0N/A * Constructor
0N/A */
0N/A public ThisExpression(long where) {
0N/A super(THIS, where, Type.tObject);
0N/A }
0N/A protected ThisExpression(int op, long where) {
0N/A super(op, where, Type.tObject);
0N/A }
0N/A public ThisExpression(long where, LocalMember field) {
0N/A super(THIS, where, Type.tObject);
0N/A this.field = field;
0N/A field.readcount++;
0N/A }
0N/A public ThisExpression(long where, Context ctx) {
0N/A super(THIS, where, Type.tObject);
0N/A field = ctx.getLocalField(idThis);
0N/A field.readcount++;
0N/A }
0N/A
0N/A /**
0N/A * Constructor for "x.this()"
0N/A */
0N/A public ThisExpression(long where, Expression outerArg) {
0N/A this(where);
0N/A this.outerArg = outerArg;
0N/A }
0N/A
0N/A public Expression getImplementation() {
0N/A if (implementation != null)
0N/A return implementation;
0N/A return this;
0N/A }
0N/A
0N/A /**
0N/A * From the 'this' in an expression of the form outer.this(...),
0N/A * or the 'super' in an expression of the form outer.super(...),
0N/A * return the "outer" expression, or null if there is none.
0N/A */
0N/A public Expression getOuterArg() {
0N/A return outerArg;
0N/A }
0N/A
0N/A /**
0N/A * Check expression
0N/A */
0N/A public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable exp) {
0N/A if (ctx.field.isStatic()) {
0N/A env.error(where, "undef.var", opNames[op]);
0N/A type = Type.tError;
0N/A return vset;
0N/A }
0N/A if (field == null) {
0N/A field = ctx.getLocalField(idThis);
0N/A field.readcount++;
0N/A }
0N/A if (field.scopeNumber < ctx.frameNumber) {
0N/A // get a "this$C" copy via the current object
0N/A implementation = ctx.makeReference(env, field);
0N/A }
0N/A if (!vset.testVar(field.number)) {
0N/A env.error(where, "access.inst.before.super", opNames[op]);
0N/A }
0N/A if (field == null) {
0N/A type = ctx.field.getClassDeclaration().getType();
0N/A } else {
0N/A type = field.getType();
0N/A }
0N/A return vset;
0N/A }
0N/A
0N/A public boolean isNonNull() {
0N/A return true;
0N/A }
0N/A
0N/A // A 'ThisExpression' node can never appear on the LHS of an assignment in a correct
0N/A // program, but handle this case anyhow to provide a safe error recovery.
0N/A
0N/A public FieldUpdater getAssigner(Environment env, Context ctx) {
0N/A return null;
0N/A }
0N/A
0N/A public FieldUpdater getUpdater(Environment env, Context ctx) {
0N/A return null;
0N/A }
0N/A
0N/A /**
0N/A * Inline
0N/A */
0N/A public Expression inlineValue(Environment env, Context ctx) {
0N/A if (implementation != null)
0N/A return implementation.inlineValue(env, ctx);
0N/A if (field != null && field.isInlineable(env, false)) {
0N/A Expression e = (Expression)field.getValue(env);
0N/A //System.out.println("INLINE = "+ e + ", THIS");
0N/A if (e != null) {
0N/A e = e.copyInline(ctx);
0N/A e.type = type; // in case op==SUPER
0N/A return e;
0N/A }
0N/A }
0N/A return this;
0N/A }
0N/A
0N/A /**
0N/A * Create a copy of the expression for method inlining
0N/A */
0N/A public Expression copyInline(Context ctx) {
0N/A if (implementation != null)
0N/A return implementation.copyInline(ctx);
0N/A ThisExpression e = (ThisExpression)clone();
0N/A if (field == null) {
0N/A // The expression is copied into the context of a method
0N/A e.field = ctx.getLocalField(idThis);
0N/A e.field.readcount++;
0N/A } else {
0N/A e.field = field.getCurrentInlineCopy(ctx);
0N/A }
0N/A if (outerArg != null) {
0N/A e.outerArg = outerArg.copyInline(ctx);
0N/A }
0N/A return e;
0N/A }
0N/A
0N/A /**
0N/A * Code
0N/A */
0N/A public void codeValue(Environment env, Context ctx, Assembler asm) {
0N/A asm.add(where, opc_aload, new Integer(field.number));
0N/A }
0N/A
0N/A /**
0N/A * Print
0N/A */
0N/A public void print(PrintStream out) {
0N/A if (outerArg != null) {
0N/A out.print("(outer=");
0N/A outerArg.print(out);
0N/A out.print(" ");
0N/A }
0N/A String pfx = (field == null) ? ""
0N/A : field.getClassDefinition().getName().getFlatName().getName()+".";
0N/A pfx += opNames[op];
0N/A out.print(pfx + "#" + ((field != null) ? field.hashCode() : 0));
0N/A if (outerArg != null)
0N/A out.print(")");
0N/A }
0N/A}