| /* |
| * 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.io.PrintStream; |
| 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 CastExpression extends BinaryExpression { |
| /** |
| * constructor |
| */ |
| public CastExpression(long where, Expression left, Expression right) { |
| super(CAST, where, left.type, left, right); |
| } |
| |
| /** |
| * Check the expression |
| */ |
| public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable<Object, Object> exp) { |
| type = left.toType(env, ctx); |
| vset = right.checkValue(env, ctx, vset, exp); |
| |
| if (type.isType(TC_ERROR) || right.type.isType(TC_ERROR)) { |
| // An error was already reported |
| return vset; |
| } |
| |
| if (type.equals(right.type)) { |
| // The types are already the same |
| return vset; |
| } |
| |
| try { |
| if (env.explicitCast(right.type, type)) { |
| right = new ConvertExpression(where, type, right); |
| return vset; |
| } |
| } catch (ClassNotFound e) { |
| env.error(where, "class.not.found", e.name, opNames[op]); |
| } |
| |
| // The cast is not allowed |
| env.error(where, "invalid.cast", right.type, type); |
| return vset; |
| } |
| |
| /** |
| * Check if constant |
| */ |
| public boolean isConstant() { |
| if (type.inMask(TM_REFERENCE) && !type.equals(Type.tString)) { |
| // must be a primitive type, or String |
| return false; |
| } |
| return right.isConstant(); |
| } |
| |
| /** |
| * Inline |
| */ |
| public Expression inline(Environment env, Context ctx) { |
| return right.inline(env, ctx); |
| } |
| public Expression inlineValue(Environment env, Context ctx) { |
| return right.inlineValue(env, ctx); |
| } |
| |
| |
| public int costInline(int thresh, Environment env, Context ctx) { |
| if (ctx == null) { |
| return 1 + right.costInline(thresh, env, ctx); |
| } |
| // sourceClass is the current class trying to inline this method |
| ClassDefinition sourceClass = ctx.field.getClassDefinition(); |
| try { |
| // We only allow the inlining if the current class can access |
| // the casting class |
| if (left.type.isType(TC_ARRAY) || |
| sourceClass.permitInlinedAccess(env, |
| env.getClassDeclaration(left.type))) |
| return 1 + right.costInline(thresh, env, ctx); |
| } catch (ClassNotFound e) { |
| } |
| return thresh; |
| } |
| |
| |
| |
| /** |
| * Print |
| */ |
| public void print(PrintStream out) { |
| out.print("(" + opNames[op] + " "); |
| if (type.isType(TC_ERROR)) { |
| left.print(out); |
| } else { |
| out.print(type); |
| } |
| out.print(" "); |
| right.print(out); |
| out.print(")"); |
| } |
| } |