| /* |
| * @(#)$Id$ |
| * |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Xalan" and "Apache Software Foundation" must |
| * not be used to endorse or promote products derived from this |
| * software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * nor may "Apache" appear in their name, without prior written |
| * permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation and was |
| * originally based on software copyright (c) 2001, Sun |
| * Microsystems., http://www.sun.com. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| * |
| */ |
| |
| package org.apache.xalan.xsltc.compiler.util; |
| |
| import org.apache.xalan.xsltc.compiler.util.Type; |
| import de.fub.bytecode.generic.*; |
| import org.apache.xalan.xsltc.compiler.Parser; |
| import org.apache.xalan.xsltc.compiler.FlowList; |
| |
| public class StringType extends Type { |
| protected StringType() {} |
| |
| public String toString() { |
| return "string"; |
| } |
| |
| public boolean identicalTo(Type other) { |
| return this == other; |
| } |
| |
| public String toSignature() { |
| return "Ljava/lang/String;"; |
| } |
| |
| public boolean isSimple() { |
| return true; |
| } |
| |
| public de.fub.bytecode.generic.Type toJCType() { |
| return de.fub.bytecode.generic.Type.STRING; |
| } |
| |
| /** |
| * Translates a string into an object of internal type <code>type</code>. |
| * The translation to int is undefined since strings are always converted |
| * to reals in arithmetic expressions. |
| * |
| * @see org.apache.xalan.xsltc.compiler.util.Type#translateTo |
| */ |
| public void translateTo(ClassGenerator classGen, MethodGenerator methodGen, |
| Type type) { |
| if (type == Type.Boolean) { |
| translateTo(classGen, methodGen, (BooleanType) type); |
| } |
| else if (type == Type.Real) { |
| translateTo(classGen, methodGen, (RealType) type); |
| } |
| else if (type == Type.Reference) { |
| translateTo(classGen, methodGen, (ReferenceType) type); |
| } |
| else { |
| classGen.getParser().internalError(); // undefined |
| } |
| } |
| |
| /** |
| * Translates a string into a synthesized boolean. |
| * |
| * @see org.apache.xalan.xsltc.compiler.util.Type#translateTo |
| */ |
| public void translateTo(ClassGenerator classGen, MethodGenerator methodGen, |
| BooleanType type) { |
| final InstructionList il = methodGen.getInstructionList(); |
| FlowList falsel = translateToDesynthesized(classGen, methodGen, type); |
| il.append(ICONST_1); |
| final BranchHandle truec = il.append(new GOTO(null)); |
| falsel.backPatch(il.append(ICONST_0)); |
| truec.setTarget(il.append(NOP)); |
| } |
| |
| /** |
| * Translates a string into a real by calling stringToReal() from the |
| * basis library. |
| * |
| * @see org.apache.xalan.xsltc.compiler.util.Type#translateTo |
| */ |
| public void translateTo(ClassGenerator classGen, MethodGenerator methodGen, |
| RealType type) { |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| final InstructionList il = methodGen.getInstructionList(); |
| il.append(new INVOKESTATIC(cpg.addMethodref(BASIS_LIBRARY_CLASS, |
| STRING_TO_REAL, |
| STRING_TO_REAL_SIG))); |
| } |
| |
| /** |
| * Translates a string into a non-synthesized boolean. It does not push a |
| * 0 or a 1 but instead returns branchhandle list to be appended to the |
| * false list. |
| * |
| * @see org.apache.xalan.xsltc.compiler.util.Type#translateToDesynthesized |
| */ |
| public FlowList translateToDesynthesized(ClassGenerator classGen, |
| MethodGenerator methodGen, |
| BooleanType type) { |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| final InstructionList il = methodGen.getInstructionList(); |
| |
| il.append(new INVOKEVIRTUAL(cpg.addMethodref(STRING_CLASS, |
| "length", "()I"))); |
| return new FlowList(il.append(new IFEQ(null))); |
| } |
| |
| /** |
| * Expects a string on the stack and pushes a boxed string. |
| * Strings are already boxed so the translation is just a NOP. |
| * |
| * @see org.apache.xalan.xsltc.compiler.util.Type#translateTo |
| */ |
| public void translateTo(ClassGenerator classGen, MethodGenerator methodGen, |
| ReferenceType type) { |
| methodGen.getInstructionList().append(NOP); |
| } |
| |
| /** |
| * Translates a internal string into an external (Java) string. |
| * |
| * @see org.apache.xalan.xsltc.compiler.util.Type#translateFrom |
| */ |
| public void translateTo(ClassGenerator classGen, MethodGenerator methodGen, |
| Class clazz) { |
| if (clazz.getName().equals("java.lang.String")) { |
| // same internal representation |
| methodGen.getInstructionList().append(NOP); |
| } |
| else { |
| classGen.getParser().internalError(); |
| } |
| } |
| |
| /** |
| * Translates an external (primitive) Java type into a string. |
| * |
| * @see org.apache.xalan.xsltc.compiler.util.Type#translateFrom |
| */ |
| public void translateFrom(ClassGenerator classGen, MethodGenerator methodGen, |
| Class clazz) { |
| translateTo(classGen, methodGen, clazz); |
| } |
| |
| /** |
| * Translates an object of this type to its boxed representation. |
| */ |
| public void translateBox(ClassGenerator classGen, |
| MethodGenerator methodGen) { |
| translateTo(classGen, methodGen, Type.Reference); |
| } |
| |
| /** |
| * Translates an object of this type to its unboxed representation. |
| */ |
| public void translateUnBox(ClassGenerator classGen, |
| MethodGenerator methodGen) { |
| methodGen.getInstructionList().append(NOP); |
| } |
| |
| /** |
| * Returns the class name of an internal type's external representation. |
| */ |
| public String getClassName() { |
| return(STRING_CLASS); |
| } |
| |
| |
| public Instruction LOAD(int slot) { |
| return new ALOAD(slot); |
| } |
| |
| public Instruction STORE(int slot) { |
| return new ASTORE(slot); |
| } |
| } |