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/*
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* reserved comment block
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* DO NOT REMOVE OR ALTER!
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*/
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/*
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* Copyright 2001-2004 The Apache Software Foundation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* $Id: RealType.java,v 1.2.4.1 2005/09/05 11:28:45 pvedula Exp $
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*/
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package com.sun.org.apache.xalan.internal.xsltc.compiler.util;
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import com.sun.org.apache.bcel.internal.generic.BranchHandle;
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import com.sun.org.apache.bcel.internal.generic.CHECKCAST;
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import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
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import com.sun.org.apache.bcel.internal.generic.DLOAD;
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import com.sun.org.apache.bcel.internal.generic.DSTORE;
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import com.sun.org.apache.bcel.internal.generic.GOTO;
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import com.sun.org.apache.bcel.internal.generic.IFEQ;
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import com.sun.org.apache.bcel.internal.generic.IFNE;
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import com.sun.org.apache.bcel.internal.generic.INVOKESPECIAL;
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import com.sun.org.apache.bcel.internal.generic.INVOKESTATIC;
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import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
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import com.sun.org.apache.bcel.internal.generic.Instruction;
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import com.sun.org.apache.bcel.internal.generic.InstructionConstants;
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import com.sun.org.apache.bcel.internal.generic.InstructionList;
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import com.sun.org.apache.bcel.internal.generic.LocalVariableGen;
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import com.sun.org.apache.bcel.internal.generic.NEW;
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import com.sun.org.apache.xalan.internal.xsltc.compiler.Constants;
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import com.sun.org.apache.xalan.internal.xsltc.compiler.FlowList;
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/**
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* @author Jacek Ambroziak
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* @author Santiago Pericas-Geertsen
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*/
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public final class RealType extends NumberType {
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protected RealType() {}
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public String toString() {
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return "real";
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}
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public boolean identicalTo(Type other) {
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return this == other;
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}
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public String toSignature() {
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return "D";
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}
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public com.sun.org.apache.bcel.internal.generic.Type toJCType() {
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return com.sun.org.apache.bcel.internal.generic.Type.DOUBLE;
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}
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/**
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* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#distanceTo
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*/
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public int distanceTo(Type type) {
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if (type == this) {
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return 0;
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}
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else if (type == Type.Int) {
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return 1;
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}
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else {
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return Integer.MAX_VALUE;
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}
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}
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/**
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* Translates a real into an object of internal type <code>type</code>. The
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* translation to int is undefined since reals are never converted to ints.
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*
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* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
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*/
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public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
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Type type) {
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if (type == Type.String) {
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translateTo(classGen, methodGen, (StringType) type);
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}
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else if (type == Type.Boolean) {
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translateTo(classGen, methodGen, (BooleanType) type);
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}
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else if (type == Type.Reference) {
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translateTo(classGen, methodGen, (ReferenceType) type);
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}
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else if (type == Type.Int) {
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translateTo(classGen, methodGen, (IntType) type);
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}
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else {
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ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
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toString(), type.toString());
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classGen.getParser().reportError(Constants.FATAL, err);
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}
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}
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/**
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* Expects a real on the stack and pushes its string value by calling
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* <code>Double.toString(double d)</code>.
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*
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* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
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*/
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public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
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StringType type) {
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final ConstantPoolGen cpg = classGen.getConstantPool();
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final InstructionList il = methodGen.getInstructionList();
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il.append(new INVOKESTATIC(cpg.addMethodref(BASIS_LIBRARY_CLASS,
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"realToString",
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"(D)" + STRING_SIG)));
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}
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/**
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* Expects a real on the stack and pushes a 0 if that number is 0.0 and
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* a 1 otherwise.
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*
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* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
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*/
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public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
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BooleanType type) {
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final InstructionList il = methodGen.getInstructionList();
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FlowList falsel = translateToDesynthesized(classGen, methodGen, type);
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il.append(ICONST_1);
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final BranchHandle truec = il.append(new GOTO(null));
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falsel.backPatch(il.append(ICONST_0));
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truec.setTarget(il.append(NOP));
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}
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/**
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* Expects a real on the stack and pushes a truncated integer value
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*
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* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
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*/
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public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
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IntType type) {
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final ConstantPoolGen cpg = classGen.getConstantPool();
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final InstructionList il = methodGen.getInstructionList();
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il.append(new INVOKESTATIC(cpg.addMethodref(BASIS_LIBRARY_CLASS,
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"realToInt","(D)I")));
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}
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/**
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* Translates a real into a non-synthesized boolean. It does not push a
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* 0 or a 1 but instead returns branchhandle list to be appended to the
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* false list. A NaN must be converted to "false".
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*
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* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateToDesynthesized
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*/
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public FlowList translateToDesynthesized(ClassGenerator classGen,
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MethodGenerator methodGen,
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BooleanType type) {
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LocalVariableGen local;
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final FlowList flowlist = new FlowList();
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final ConstantPoolGen cpg = classGen.getConstantPool();
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final InstructionList il = methodGen.getInstructionList();
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// Store real into a local variable
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il.append(DUP2);
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local = methodGen.addLocalVariable("real_to_boolean_tmp",
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com.sun.org.apache.bcel.internal.generic.Type.DOUBLE,
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il.getEnd(), null);
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il.append(new DSTORE(local.getIndex()));
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// Compare it to 0.0
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il.append(DCONST_0);
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il.append(DCMPG);
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flowlist.add(il.append(new IFEQ(null)));
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//!!! call isNaN
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// Compare it to itself to see if NaN
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il.append(new DLOAD(local.getIndex()));
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il.append(new DLOAD(local.getIndex()));
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il.append(DCMPG);
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flowlist.add(il.append(new IFNE(null))); // NaN != NaN
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return flowlist;
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}
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/**
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* Expects a double on the stack and pushes a boxed double. Boxed
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* double are represented by an instance of <code>java.lang.Double</code>.
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*
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* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
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*/
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public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
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ReferenceType type) {
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final ConstantPoolGen cpg = classGen.getConstantPool();
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final InstructionList il = methodGen.getInstructionList();
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il.append(new NEW(cpg.addClass(DOUBLE_CLASS)));
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il.append(DUP_X2);
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il.append(DUP_X2);
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il.append(POP);
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il.append(new INVOKESPECIAL(cpg.addMethodref(DOUBLE_CLASS,
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"<init>", "(D)V")));
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}
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/**
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* Translates a real into the Java type denoted by <code>clazz</code>.
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* Expects a real on the stack and pushes a number of the appropriate
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* type after coercion.
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*/
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public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
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final Class clazz) {
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final InstructionList il = methodGen.getInstructionList();
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if (clazz == Character.TYPE) {
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il.append(D2I);
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il.append(I2C);
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}
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else if (clazz == Byte.TYPE) {
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il.append(D2I);
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il.append(I2B);
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}
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else if (clazz == Short.TYPE) {
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il.append(D2I);
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il.append(I2S);
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}
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else if (clazz == Integer.TYPE) {
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il.append(D2I);
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}
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else if (clazz == Long.TYPE) {
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il.append(D2L);
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}
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else if (clazz == Float.TYPE) {
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il.append(D2F);
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}
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else if (clazz == Double.TYPE) {
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il.append(NOP);
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}
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// Is Double <: clazz? I.e. clazz in { Double, Number, Object }
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else if (clazz.isAssignableFrom(java.lang.Double.class)) {
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translateTo(classGen, methodGen, Type.Reference);
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}
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else {
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ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
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toString(), clazz.getName());
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classGen.getParser().reportError(Constants.FATAL, err);
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}
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}
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/**
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* Translates an external (primitive) Java type into a real. Expects a java
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* object on the stack and pushes a real (i.e., a double).
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*/
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public void translateFrom(ClassGenerator classGen, MethodGenerator methodGen,
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Class clazz) {
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InstructionList il = methodGen.getInstructionList();
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if (clazz == Character.TYPE || clazz == Byte.TYPE ||
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clazz == Short.TYPE || clazz == Integer.TYPE) {
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il.append(I2D);
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}
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else if (clazz == Long.TYPE) {
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il.append(L2D);
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}
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else if (clazz == Float.TYPE) {
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il.append(F2D);
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}
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else if (clazz == Double.TYPE) {
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il.append(NOP);
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}
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else {
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ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
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toString(), clazz.getName());
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classGen.getParser().reportError(Constants.FATAL, err);
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}
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}
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/**
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* Translates an object of this type to its boxed representation.
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*/
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public void translateBox(ClassGenerator classGen,
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MethodGenerator methodGen) {
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translateTo(classGen, methodGen, Type.Reference);
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}
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/**
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* Translates an object of this type to its unboxed representation.
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*/
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public void translateUnBox(ClassGenerator classGen,
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MethodGenerator methodGen) {
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final ConstantPoolGen cpg = classGen.getConstantPool();
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final InstructionList il = methodGen.getInstructionList();
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il.append(new CHECKCAST(cpg.addClass(DOUBLE_CLASS)));
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il.append(new INVOKEVIRTUAL(cpg.addMethodref(DOUBLE_CLASS,
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DOUBLE_VALUE,
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DOUBLE_VALUE_SIG)));
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}
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public Instruction ADD() {
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return InstructionConstants.DADD;
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}
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public Instruction SUB() {
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return InstructionConstants.DSUB;
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}
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public Instruction MUL() {
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return InstructionConstants.DMUL;
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}
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public Instruction DIV() {
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return InstructionConstants.DDIV;
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}
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public Instruction REM() {
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return InstructionConstants.DREM;
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}
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public Instruction NEG() {
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return InstructionConstants.DNEG;
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}
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public Instruction LOAD(int slot) {
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return new DLOAD(slot);
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}
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public Instruction STORE(int slot) {
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return new DSTORE(slot);
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}
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public Instruction POP() {
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return POP2;
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}
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public Instruction CMP(boolean less) {
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return less ? InstructionConstants.DCMPG : InstructionConstants.DCMPL;
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}
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public Instruction DUP() {
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return DUP2;
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}
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}
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