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 sun.tools.asm.Label;
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 NotExpression extends UnaryExpression {
0N/A /**
0N/A * Constructor
0N/A */
0N/A public NotExpression(long where, Expression right) {
0N/A super(NOT, where, Type.tBoolean, right);
0N/A }
0N/A
0N/A /**
0N/A * Select the type of the expression
0N/A */
0N/A void selectType(Environment env, Context ctx, int tm) {
0N/A right = convert(env, ctx, Type.tBoolean, right);
0N/A }
0N/A
0N/A /*
0N/A * Check a "not" expression.
0N/A *
0N/A * cvars is modified so that
0N/A * cvar.vsTrue indicates variables with a known value if
0N/A * the expression is true.
0N/A * cvars.vsFalse indicates variables with a known value if
0N/A * the expression is false
0N/A *
0N/A * For "not" expressions, we look at the inside expression, and then
0N/A * swap true and false.
0N/A */
0N/A
0N/A public void checkCondition(Environment env, Context ctx, Vset vset,
0N/A Hashtable exp, ConditionVars cvars) {
0N/A right.checkCondition(env, ctx, vset, exp, cvars);
0N/A right = convert(env, ctx, Type.tBoolean, right);
0N/A // swap true and false
0N/A Vset temp = cvars.vsFalse;
0N/A cvars.vsFalse = cvars.vsTrue;
0N/A cvars.vsTrue = temp;
0N/A }
0N/A
0N/A /**
0N/A * Evaluate
0N/A */
0N/A Expression eval(boolean a) {
0N/A return new BooleanExpression(where, !a);
0N/A }
0N/A
0N/A /**
0N/A * Simplify
0N/A */
0N/A Expression simplify() {
0N/A // Check if the expression can be optimized
0N/A switch (right.op) {
0N/A case NOT:
0N/A return ((NotExpression)right).right;
0N/A
0N/A case EQ:
0N/A case NE:
0N/A case LT:
0N/A case LE:
0N/A case GT:
0N/A case GE:
0N/A break;
0N/A
0N/A default:
0N/A return this;
0N/A }
0N/A
0N/A // Can't negate real comparisons
0N/A BinaryExpression bin = (BinaryExpression)right;
0N/A if (bin.left.type.inMask(TM_REAL)) {
0N/A return this;
0N/A }
0N/A
0N/A // Negate comparison
0N/A switch (right.op) {
0N/A case EQ:
0N/A return new NotEqualExpression(where, bin.left, bin.right);
0N/A case NE:
0N/A return new EqualExpression(where, bin.left, bin.right);
0N/A case LT:
0N/A return new GreaterOrEqualExpression(where, bin.left, bin.right);
0N/A case LE:
0N/A return new GreaterExpression(where, bin.left, bin.right);
0N/A case GT:
0N/A return new LessOrEqualExpression(where, bin.left, bin.right);
0N/A case GE:
0N/A return new LessExpression(where, bin.left, bin.right);
0N/A }
0N/A return this;
0N/A }
0N/A
0N/A /**
0N/A * Code
0N/A */
0N/A void codeBranch(Environment env, Context ctx, Assembler asm, Label lbl, boolean whenTrue) {
0N/A right.codeBranch(env, ctx, asm, lbl, !whenTrue);
0N/A }
0N/A
0N/A /**
0N/A * Instead of relying on the default code generation which uses
0N/A * conditional branching, generate a simpler stream using XOR.
0N/A */
0N/A public void codeValue(Environment env, Context ctx, Assembler asm) {
0N/A right.codeValue(env, ctx, asm);
0N/A asm.add(where, opc_ldc, new Integer(1));
0N/A asm.add(where, opc_ixor);
0N/A }
0N/A
0N/A}