/*
* 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: BooleanType.java,v 1.2.4.1 2005/09/05 11:03:37 pvedula 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.BranchInstruction;
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.GOTO;
import com.sun.org.apache.bcel.internal.generic.IFEQ;
import com.sun.org.apache.bcel.internal.generic.IFGE;
import com.sun.org.apache.bcel.internal.generic.IFGT;
import com.sun.org.apache.bcel.internal.generic.IFLE;
import com.sun.org.apache.bcel.internal.generic.IFLT;
import com.sun.org.apache.bcel.internal.generic.IF_ICMPGE;
import com.sun.org.apache.bcel.internal.generic.IF_ICMPGT;
import com.sun.org.apache.bcel.internal.generic.IF_ICMPLE;
import com.sun.org.apache.bcel.internal.generic.IF_ICMPLT;
import com.sun.org.apache.bcel.internal.generic.ILOAD;
import com.sun.org.apache.bcel.internal.generic.INVOKESPECIAL;
import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
import com.sun.org.apache.bcel.internal.generic.ISTORE;
import com.sun.org.apache.bcel.internal.generic.Instruction;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.NEW;
import com.sun.org.apache.bcel.internal.generic.PUSH;
import com.sun.org.apache.xalan.internal.xsltc.compiler.Constants;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
*/
public final class BooleanType extends Type {
protected BooleanType() {}
public String toString() {
return "boolean";
}
public boolean identicalTo(Type other) {
return this == other;
}
public String toSignature() {
return "Z";
}
public boolean isSimple() {
return true;
}
public com.sun.org.apache.bcel.internal.generic.Type toJCType() {
return com.sun.org.apache.bcel.internal.generic.Type.BOOLEAN;
}
/**
* Translates a real into an object of internal type <code>type</code>. The
* translation to int is undefined since booleans are always converted to
* reals in arithmetic expressions.
*
* @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.Real) {
translateTo(classGen, methodGen, (RealType) type);
}
else if (type == Type.Reference) {
translateTo(classGen, methodGen, (ReferenceType) type);
}
else {
ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
toString(), type.toString());
classGen.getParser().reportError(Constants.FATAL, err);
}
}
/**
* Expects a boolean on the stack and pushes a string. If the value on the
* stack is zero, then the string 'false' is pushed. Otherwise, the string
* 'true' is pushed.
*
* @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();
final BranchHandle falsec = il.append(new IFEQ(null));
il.append(new PUSH(cpg, "true"));
final BranchHandle truec = il.append(new GOTO(null));
falsec.setTarget(il.append(new PUSH(cpg, "false")));
truec.setTarget(il.append(NOP));
}
/**
* Expects a boolean on the stack and pushes a real. The value "true" is
* converted to 1.0 and the value "false" to 0.0.
*
* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
*/
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
RealType type) {
methodGen.getInstructionList().append(I2D);
}
/**
* Expects a boolean on the stack and pushes a boxed boolean.
* Boxed booleans are represented by an instance of
* <code>java.lang.Boolean</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(BOOLEAN_CLASS)));
il.append(DUP_X1);
il.append(SWAP);
il.append(new INVOKESPECIAL(cpg.addMethodref(BOOLEAN_CLASS,
"<init>",
"(Z)V")));
}
/**
* Translates an internal boolean into an external (Java) boolean.
*/
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
Class clazz) {
if (clazz == java.lang.Boolean.TYPE) {
methodGen.getInstructionList().append(NOP);
}
// Is Boolean <: clazz? I.e. clazz in { Boolean, Object }
else if (clazz.isAssignableFrom(java.lang.Boolean.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 (Java) boolean into internal boolean.
*/
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) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
il.append(new CHECKCAST(cpg.addClass(BOOLEAN_CLASS)));
il.append(new INVOKEVIRTUAL(cpg.addMethodref(BOOLEAN_CLASS,
BOOLEAN_VALUE,
BOOLEAN_VALUE_SIG)));
}
public Instruction LOAD(int slot) {
return new ILOAD(slot);
}
public Instruction STORE(int slot) {
return new ISTORE(slot);
}
public BranchInstruction GT(boolean tozero) {
return tozero ? (BranchInstruction) new IFGT(null) :
(BranchInstruction) new IF_ICMPGT(null);
}
public BranchInstruction GE(boolean tozero) {
return tozero ? (BranchInstruction) new IFGE(null) :
(BranchInstruction) new IF_ICMPGE(null);
}
public BranchInstruction LT(boolean tozero) {
return tozero ? (BranchInstruction) new IFLT(null) :
(BranchInstruction) new IF_ICMPLT(null);
}
public BranchInstruction LE(boolean tozero) {
return tozero ? (BranchInstruction) new IFLE(null) :
(BranchInstruction) new IF_ICMPLE(null);
}
}
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