/*
* Copyright 2001-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: RealType.java,v 1.8 2004/02/16 22:26:44 minchau Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler.util;
import com.sun.org.apache.bcel.internal.generic.BranchHandle;
import com.sun.org.apache.bcel.internal.generic.CHECKCAST;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.DLOAD;
import com.sun.org.apache.bcel.internal.generic.DSTORE;
import com.sun.org.apache.bcel.internal.generic.GOTO;
import com.sun.org.apache.bcel.internal.generic.IFEQ;
import com.sun.org.apache.bcel.internal.generic.IFNE;
import com.sun.org.apache.bcel.internal.generic.INVOKESPECIAL;
import com.sun.org.apache.bcel.internal.generic.INVOKESTATIC;
import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
import com.sun.org.apache.bcel.internal.generic.Instruction;
import com.sun.org.apache.bcel.internal.generic.InstructionConstants;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.LocalVariableGen;
import com.sun.org.apache.bcel.internal.generic.NEW;
import com.sun.org.apache.xalan.internal.xsltc.compiler.Constants;
import com.sun.org.apache.xalan.internal.xsltc.compiler.FlowList;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
*/
public final class RealType extends NumberType {
protected RealType() {}
public String toString() {
return "real";
}
public boolean identicalTo(Type other) {
return this == other;
}
public String toSignature() {
return "D";
}
public com.sun.org.apache.bcel.internal.generic.Type toJCType() {
return com.sun.org.apache.bcel.internal.generic.Type.DOUBLE;
}
/**
* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#distanceTo
*/
public int distanceTo(Type type) {
if (type == this) {
return 0;
}
else if (type == Type.Int) {
return 1;
}
else {
return Integer.MAX_VALUE;
}
}
/**
* Translates a real into an object of internal type <code>type</code>. The
* translation to int is undefined since reals are never converted to ints.
*
* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
*/
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
Type type) {
if (type == Type.String) {
translateTo(classGen, methodGen, (StringType) type);
}
else if (type == Type.Boolean) {
translateTo(classGen, methodGen, (BooleanType) type);
}
else if (type == Type.Reference) {
translateTo(classGen, methodGen, (ReferenceType) type);
}
else if (type == Type.Int) {
translateTo(classGen, methodGen, (IntType) type);
}
else {
ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
toString(), type.toString());
classGen.getParser().reportError(Constants.FATAL, err);
}
}
/**
* Expects a real on the stack and pushes its string value by calling
* <code>Double.toString(double d)</code>.
*
* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
*/
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
StringType type) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
il.append(new INVOKESTATIC(cpg.addMethodref(BASIS_LIBRARY_CLASS,
"realToString",
"(D)" + STRING_SIG)));
}
/**
* Expects a real on the stack and pushes a 0 if that number is 0.0 and
* a 1 otherwise.
*
* @see com.sun.org.apache.xalan.internal.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));
}
/**
* Expects a real on the stack and pushes a truncated integer value
*
* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
*/
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
IntType type) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
il.append(new INVOKESTATIC(cpg.addMethodref(BASIS_LIBRARY_CLASS,
"realToInt","(D)I")));
}
/**
* Translates a real 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. A NaN must be converted to "false".
*
* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateToDesynthesized
*/
public FlowList translateToDesynthesized(ClassGenerator classGen,
MethodGenerator methodGen,
BooleanType type) {
LocalVariableGen local;
final FlowList flowlist = new FlowList();
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
// Store real into a local variable
il.append(DUP2);
local = methodGen.addLocalVariable("real_to_boolean_tmp",
com.sun.org.apache.bcel.internal.generic.Type.DOUBLE,
il.getEnd(), null);
il.append(new DSTORE(local.getIndex()));
// Compare it to 0.0
il.append(DCONST_0);
il.append(DCMPG);
flowlist.add(il.append(new IFEQ(null)));
//!!! call isNaN
// Compare it to itself to see if NaN
il.append(new DLOAD(local.getIndex()));
il.append(new DLOAD(local.getIndex()));
il.append(DCMPG);
flowlist.add(il.append(new IFNE(null))); // NaN != NaN
return flowlist;
}
/**
* Expects a double on the stack and pushes a boxed double. Boxed
* double are represented by an instance of <code>java.lang.Double</code>.
*
* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
*/
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
ReferenceType type) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
il.append(new NEW(cpg.addClass(DOUBLE_CLASS)));
il.append(DUP_X2);
il.append(DUP_X2);
il.append(POP);
il.append(new INVOKESPECIAL(cpg.addMethodref(DOUBLE_CLASS,
"<init>", "(D)V")));
}
/**
* Translates a real into the Java type denoted by <code>clazz</code>.
* Expects a real on the stack and pushes a number of the appropriate
* type after coercion.
*/
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
final Class clazz) {
final InstructionList il = methodGen.getInstructionList();
if (clazz == Character.TYPE) {
il.append(D2I);
il.append(I2C);
}
else if (clazz == Byte.TYPE) {
il.append(D2I);
il.append(I2B);
}
else if (clazz == Short.TYPE) {
il.append(D2I);
il.append(I2S);
}
else if (clazz == Integer.TYPE) {
il.append(D2I);
}
else if (clazz == Long.TYPE) {
il.append(D2L);
}
else if (clazz == Float.TYPE) {
il.append(D2F);
}
else if (clazz == Double.TYPE) {
il.append(NOP);
}
// Is Double <: clazz? I.e. clazz in { Double, Number, Object }
else if (clazz.isAssignableFrom(java.lang.Double.class)) {
translateTo(classGen, methodGen, Type.Reference);
}
else {
ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
toString(), clazz.getName());
classGen.getParser().reportError(Constants.FATAL, err);
}
}
/**
* Translates an external (primitive) Java type into a real. Expects a java
* object on the stack and pushes a real (i.e., a double).
*/
public void translateFrom(ClassGenerator classGen, MethodGenerator methodGen,
Class clazz) {
InstructionList il = methodGen.getInstructionList();
if (clazz == Character.TYPE || clazz == Byte.TYPE ||
clazz == Short.TYPE || clazz == Integer.TYPE) {
il.append(I2D);
}
else if (clazz == Long.TYPE) {
il.append(L2D);
}
else if (clazz == Float.TYPE) {
il.append(F2D);
}
else if (clazz == Double.TYPE) {
il.append(NOP);
}
else {
ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
toString(), clazz.getName());
classGen.getParser().reportError(Constants.FATAL, err);
}
}
/**
* 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) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
il.append(new CHECKCAST(cpg.addClass(DOUBLE_CLASS)));
il.append(new INVOKEVIRTUAL(cpg.addMethodref(DOUBLE_CLASS,
DOUBLE_VALUE,
DOUBLE_VALUE_SIG)));
}
public Instruction ADD() {
return InstructionConstants.DADD;
}
public Instruction SUB() {
return InstructionConstants.DSUB;
}
public Instruction MUL() {
return InstructionConstants.DMUL;
}
public Instruction DIV() {
return InstructionConstants.DDIV;
}
public Instruction REM() {
return InstructionConstants.DREM;
}
public Instruction NEG() {
return InstructionConstants.DNEG;
}
public Instruction LOAD(int slot) {
return new DLOAD(slot);
}
public Instruction STORE(int slot) {
return new DSTORE(slot);
}
public Instruction POP() {
return POP2;
}
public Instruction CMP(boolean less) {
return less ? InstructionConstants.DCMPG : InstructionConstants.DCMPL;
}
public Instruction DUP() {
return DUP2;
}
}
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