/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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
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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.
/** * 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 InstanceOfExpression extends BinaryExpression {
constructor
/** * constructor */
public InstanceOfExpression(long where, Expression left, Expression right) { super(INSTANCEOF, where, Type.tBoolean, left, right); }
Check the expression
/** * Check the expression */
public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable<Object, Object> exp) { vset = left.checkValue(env, ctx, vset, exp); right = new TypeExpression(right.where, right.toType(env, ctx)); if (right.type.isType(TC_ERROR) || left.type.isType(TC_ERROR)) { // An error was already reported return vset; } if (!right.type.inMask(TM_CLASS|TM_ARRAY)) { env.error(right.where, "invalid.arg.type", right.type, opNames[op]); return vset; } try { if (!env.explicitCast(left.type, right.type)) { env.error(where, "invalid.instanceof", left.type, right.type); } } catch (ClassNotFound e) { env.error(where, "class.not.found", e.name, opNames[op]); } return vset; }
Inline
/** * Inline */
public Expression inline(Environment env, Context ctx) { return left.inline(env, ctx); } public Expression inlineValue(Environment env, Context ctx) { left = left.inlineValue(env, ctx); return this; } public int costInline(int thresh, Environment env, Context ctx) { if (ctx == null) { return 1 + left.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 "instance of" class if (right.type.isType(TC_ARRAY) || sourceClass.permitInlinedAccess(env, env.getClassDeclaration(right.type))) return 1 + left.costInline(thresh, env, ctx); } catch (ClassNotFound e) { } return thresh; }
Code
/** * Code */
public void codeValue(Environment env, Context ctx, Assembler asm) { left.codeValue(env, ctx, asm); if (right.type.isType(TC_CLASS)) { asm.add(where, opc_instanceof, env.getClassDeclaration(right.type)); } else { asm.add(where, opc_instanceof, right.type); } } void codeBranch(Environment env, Context ctx, Assembler asm, Label lbl, boolean whenTrue) { codeValue(env, ctx, asm); asm.add(where, whenTrue ? opc_ifne : opc_ifeq, lbl, whenTrue); } public void code(Environment env, Context ctx, Assembler asm) { left.code(env, ctx, asm); }
Print
/** * Print */
public void print(PrintStream out) { out.print("(" + opNames[op] + " "); left.print(out); out.print(" "); if (right.op == TYPE) { out.print(right.type.toString()); } else { right.print(out); } out.print(")"); } }