| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * 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); |
| } |
| } |
