| /* |
| * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.tools.tree; |
| |
| import sun.tools.java.*; |
| import sun.tools.asm.Assembler; |
| import sun.tools.asm.Label; |
| import java.util.Hashtable; |
| |
| /** |
| * WARNING: The contents of this source file are not part of any |
| * supported API. Code that depends on them does so at its own risk: |
| * they are subject to change or removal without notice. |
| */ |
| public |
| class OrExpression extends BinaryLogicalExpression { |
| /** |
| * constructor |
| */ |
| public OrExpression(long where, Expression left, Expression right) { |
| super(OR, where, left, right); |
| } |
| |
| /* |
| * Check an "or" expression. |
| * |
| * cvars is modified so that |
| * cvar.vsTrue indicates variables with a known value if |
| * either the left and right hand side isn true |
| * cvars.vsFalse indicates variables with a known value if |
| * both the left or right hand side are false |
| */ |
| public void checkCondition(Environment env, Context ctx, Vset vset, |
| Hashtable exp, ConditionVars cvars) { |
| // Find out when the left side is true/false |
| left.checkCondition(env, ctx, vset, exp, cvars); |
| left = convert(env, ctx, Type.tBoolean, left); |
| Vset vsTrue = cvars.vsTrue.copy(); |
| Vset vsFalse = cvars.vsFalse.copy(); |
| |
| // Only look at the right side if the left side is false |
| right.checkCondition(env, ctx, vsFalse, exp, cvars); |
| right = convert(env, ctx, Type.tBoolean, right); |
| |
| // cvars.vsFalse actually reports that both returned false |
| // cvars.vsTrue must be set back to either left side or the right |
| // side returning false; |
| cvars.vsTrue = cvars.vsTrue.join(vsTrue); |
| } |
| |
| /** |
| * Evaluate |
| */ |
| Expression eval(boolean a, boolean b) { |
| return new BooleanExpression(where, a || b); |
| } |
| |
| /** |
| * Simplify |
| */ |
| Expression simplify() { |
| if (right.equals(false)) { |
| return left; |
| } |
| if (left.equals(true)) { |
| return left; |
| } |
| if (left.equals(false)) { |
| return right; |
| } |
| if (right.equals(true)) { |
| // Preserve effects of left argument. |
| return new CommaExpression(where, left, right).simplify(); |
| } |
| return this; |
| } |
| |
| /** |
| * Code |
| */ |
| void codeBranch(Environment env, Context ctx, Assembler asm, Label lbl, boolean whenTrue) { |
| if (whenTrue) { |
| left.codeBranch(env, ctx, asm, lbl, true); |
| right.codeBranch(env, ctx, asm, lbl, true); |
| } else { |
| Label lbl2 = new Label(); |
| left.codeBranch(env, ctx, asm, lbl2, true); |
| right.codeBranch(env, ctx, asm, lbl, false); |
| asm.add(lbl2); |
| } |
| } |
| } |