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- /*
- * Javassist, a Java-bytecode translator toolkit.
- * Copyright (C) 1999-2006 Shigeru Chiba. All Rights Reserved.
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. Alternatively, the contents of this file may be used under
- * the terms of the GNU Lesser General Public License Version 2.1 or later.
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- */
-
- package javassist;
-
- import javassist.bytecode.*;
- import javassist.compiler.Javac;
- import javassist.compiler.SymbolTable;
- import javassist.compiler.CompileError;
- import javassist.compiler.ast.ASTree;
- import javassist.compiler.ast.IntConst;
- import javassist.compiler.ast.DoubleConst;
- import javassist.compiler.ast.StringL;
-
- /**
- * An instance of CtField represents a field.
- *
- * @see CtClass#getDeclaredFields()
- */
- public class CtField extends CtMember {
- static final String javaLangString = "java.lang.String";
-
- protected FieldInfo fieldInfo;
-
- /**
- * Creates a <code>CtField</code> object.
- * The created field must be added to a class
- * with <code>CtClass.addField()</code>.
- * An initial value of the field is specified
- * by a <code>CtField.Initializer</code> object.
- *
- * <p>If getter and setter methods are needed,
- * call <code>CtNewMethod.getter()</code> and
- * <code>CtNewMethod.setter()</code>.
- *
- * @param type field type
- * @param name field name
- * @param declaring the class to which the field will be added.
- *
- * @see CtClass#addField(CtField)
- * @see CtNewMethod#getter(String,CtField)
- * @see CtNewMethod#setter(String,CtField)
- * @see CtField.Initializer
- */
- public CtField(CtClass type, String name, CtClass declaring)
- throws CannotCompileException
- {
- this(Descriptor.of(type), name, declaring);
- }
-
- /**
- * Creates a copy of the given field.
- * The created field must be added to a class
- * with <code>CtClass.addField()</code>.
- * An initial value of the field is specified
- * by a <code>CtField.Initializer</code> object.
- *
- * <p>If getter and setter methods are needed,
- * call <code>CtNewMethod.getter()</code> and
- * <code>CtNewMethod.setter()</code>.
- *
- * @param src the original field
- * @param declaring the class to which the field will be added.
- * @see CtNewMethod#getter(String,CtField)
- * @see CtNewMethod#setter(String,CtField)
- * @see CtField.Initializer
- */
- public CtField(CtField src, CtClass declaring)
- throws CannotCompileException
- {
- this(src.fieldInfo.getDescriptor(), src.fieldInfo.getName(),
- declaring);
- }
-
- private CtField(String typeDesc, String name, CtClass clazz)
- throws CannotCompileException
- {
- super(clazz);
- next = null;
- ClassFile cf = clazz.getClassFile2();
- if (cf == null)
- throw new CannotCompileException("bad declaring class: "
- + clazz.getName());
-
- fieldInfo = new FieldInfo(cf.getConstPool(), name, typeDesc);
- }
-
- CtField(FieldInfo fi, CtClass clazz) {
- super(clazz);
- fieldInfo = fi;
- next = null;
- }
-
- /**
- * Returns a String representation of the object.
- */
- public String toString() {
- return getDeclaringClass().getName() + "." + getName()
- + ":" + fieldInfo.getDescriptor();
- }
-
- protected void extendToString(StringBuffer buffer) {
- buffer.append(' ');
- buffer.append(getName());
- buffer.append(' ');
- buffer.append(fieldInfo.getDescriptor());
- }
-
- /* Javac.CtFieldWithInit overrides.
- */
- protected ASTree getInitAST() { return null; }
-
- /* Called by CtClassType.addField().
- */
- Initializer getInit() {
- ASTree tree = getInitAST();
- if (tree == null)
- return null;
- else
- return Initializer.byExpr(tree);
- }
-
- /**
- * Compiles the given source code and creates a field.
- * Examples of the source code are:
- *
- * <ul><pre>
- * "public String name;"
- * "public int k = 3;"</pre></ul>
- *
- * <p>Note that the source code ends with <code>';'</code>
- * (semicolon).
- *
- * @param src the source text.
- * @param declaring the class to which the created field is added.
- */
- public static CtField make(String src, CtClass declaring)
- throws CannotCompileException
- {
- Javac compiler = new Javac(declaring);
- try {
- CtMember obj = compiler.compile(src);
- if (obj instanceof CtField)
- return (CtField)obj; // an instance of Javac.CtFieldWithInit
- }
- catch (CompileError e) {
- throw new CannotCompileException(e);
- }
-
- throw new CannotCompileException("not a field");
- }
-
- /**
- * Returns the FieldInfo representing the field in the class file.
- */
- public FieldInfo getFieldInfo() {
- declaringClass.checkModify();
- return fieldInfo;
- }
-
- /**
- * Returns the FieldInfo representing the field in the class
- * file (read only).
- * Normal applications do not need calling this method. Use
- * <code>getFieldInfo()</code>.
- *
- * <p>The <code>FieldInfo</code> object obtained by this method
- * is read only. Changes to this object might not be reflected
- * on a class file generated by <code>toBytecode()</code>,
- * <code>toClass()</code>, etc in <code>CtClass</code>.
- *
- * <p>This method is available even if the <code>CtClass</code>
- * containing this field is frozen. However, if the class is
- * frozen, the <code>FieldInfo</code> might be also pruned.
- *
- * @see #getFieldInfo()
- * @see CtClass#isFrozen()
- * @see CtClass#prune()
- */
- public FieldInfo getFieldInfo2() { return fieldInfo; }
-
- /**
- * Returns the class declaring the field.
- */
- public CtClass getDeclaringClass() {
- // this is redundant but for javadoc.
- return super.getDeclaringClass();
- }
-
- /**
- * Returns the name of the field.
- */
- public String getName() {
- return fieldInfo.getName();
- }
-
- /**
- * Changes the name of the field.
- */
- public void setName(String newName) {
- declaringClass.checkModify();
- fieldInfo.setName(newName);
- }
-
- /**
- * Returns the encoded modifiers of the field.
- *
- * @see Modifier
- */
- public int getModifiers() {
- return AccessFlag.toModifier(fieldInfo.getAccessFlags());
- }
-
- /**
- * Sets the encoded modifiers of the field.
- *
- * @see Modifier
- */
- public void setModifiers(int mod) {
- declaringClass.checkModify();
- fieldInfo.setAccessFlags(AccessFlag.of(mod));
- }
-
- /**
- * Returns the annotations associated with this field.
- *
- * @return an array of annotation-type objects.
- * @see CtMember#getAnnotations()
- * @since 3.1
- */
- public Object[] getAnnotations() throws ClassNotFoundException {
- FieldInfo fi = getFieldInfo2();
- AnnotationsAttribute ainfo = (AnnotationsAttribute)
- fi.getAttribute(AnnotationsAttribute.invisibleTag);
- AnnotationsAttribute ainfo2 = (AnnotationsAttribute)
- fi.getAttribute(AnnotationsAttribute.visibleTag);
- return CtClassType.toAnnotationType(getDeclaringClass().getClassPool(),
- ainfo, ainfo2);
- }
-
- /**
- * Returns the character string representing the type of the field.
- * If two fields have the same type,
- * <code>getSignature()</code> returns the same string.
- */
- public String getSignature() {
- return fieldInfo.getDescriptor();
- }
-
- /**
- * Returns the type of the field.
- */
- public CtClass getType() throws NotFoundException {
- return Descriptor.toCtClass(fieldInfo.getDescriptor(),
- declaringClass.getClassPool());
- }
-
- /**
- * Sets the type of the field.
- */
- public void setType(CtClass clazz) {
- declaringClass.checkModify();
- fieldInfo.setDescriptor(Descriptor.of(clazz));
- }
-
- /**
- * Returns the value of this field if it is a constant field.
- * This method works only if the field type is a primitive type
- * or <code>String</code> type. Otherwise, it returns <code>null</code>.
- * A constant field is <code>static</code> and <code>final</code>.
- *
- * @return a <code>Integer</code>, <code>Long</code>, <code>Float</code>,
- * <code>Double</code>, <code>Boolean</code>,
- * or <code>String</code> object
- * representing the constant value.
- * <code>null</code> if it is not a constant field
- * or if the field type is not a primitive type
- * or <code>String</code>.
- */
- public Object getConstantValue() {
- // When this method is modified,
- // see also getConstantFieldValue() in TypeChecker.
-
- int index = fieldInfo.getConstantValue();
- if (index == 0)
- return null;
-
- ConstPool cp = fieldInfo.getConstPool();
- switch (cp.getTag(index)) {
- case ConstPool.CONST_Long :
- return new Long(cp.getLongInfo(index));
- case ConstPool.CONST_Float :
- return new Float(cp.getFloatInfo(index));
- case ConstPool.CONST_Double :
- return new Double(cp.getDoubleInfo(index));
- case ConstPool.CONST_Integer :
- int value = cp.getIntegerInfo(index);
- // "Z" means boolean type.
- if ("Z".equals(fieldInfo.getDescriptor()))
- return new Boolean(value != 0);
- else
- return new Integer(value);
- case ConstPool.CONST_String :
- return cp.getStringInfo(index);
- default :
- throw new RuntimeException("bad tag: " + cp.getTag(index)
- + " at " + index);
- }
- }
-
- /**
- * Obtains an attribute with the given name.
- * If that attribute is not found in the class file, this
- * method returns null.
- *
- * <p>Note that an attribute is a data block specified by
- * the class file format.
- * See {@link javassist.bytecode.AttributeInfo}.
- *
- * @param name attribute name
- */
- public byte[] getAttribute(String name) {
- AttributeInfo ai = fieldInfo.getAttribute(name);
- if (ai == null)
- return null;
- else
- return ai.get();
- }
-
- /**
- * Adds an attribute. The attribute is saved in the class file.
- *
- * <p>Note that an attribute is a data block specified by
- * the class file format.
- * See {@link javassist.bytecode.AttributeInfo}.
- *
- * @param name attribute name
- * @param data attribute value
- */
- public void setAttribute(String name, byte[] data) {
- declaringClass.checkModify();
- fieldInfo.addAttribute(new AttributeInfo(fieldInfo.getConstPool(),
- name, data));
- }
-
- // inner classes
-
- /**
- * Instances of this class specify how to initialize a field.
- * <code>Initializer</code> is passed to
- * <code>CtClass.addField()</code> with a <code>CtField</code>.
- *
- * <p>This class cannot be instantiated with the <code>new</code> operator.
- * Factory methods such as <code>byParameter()</code> and
- * <code>byNew</code>
- * must be used for the instantiation. They create a new instance with
- * the given parameters and return it.
- *
- * @see CtClass#addField(CtField,CtField.Initializer)
- */
- public static abstract class Initializer {
- /**
- * Makes an initializer that assigns a constant integer value.
- * The field must be integer type.
- */
- public static Initializer constant(int i) {
- return new IntInitializer(i);
- }
-
- /**
- * Makes an initializer that assigns a constant long value.
- * The field must be long type.
- */
- public static Initializer constant(long l) {
- return new LongInitializer(l);
- }
-
- /**
- * Makes an initializer that assigns a constant double value.
- * The field must be double type.
- */
- public static Initializer constant(double d) {
- return new DoubleInitializer(d);
- }
-
- /**
- * Makes an initializer that assigns a constant string value.
- * The field must be <code>java.lang.String</code> type.
- */
- public static Initializer constant(String s) {
- return new StringInitializer(s);
- }
-
- /**
- * Makes an initializer using a constructor parameter.
- *
- * <p>The initial value is the
- * N-th parameter given to the constructor of the object including
- * the field. If the constructor takes less than N parameters,
- * the field is not initialized.
- * If the field is static, it is never initialized.
- *
- * @param nth the n-th (>= 0) parameter is used as
- * the initial value.
- * If nth is 0, then the first parameter is
- * used.
- */
- public static Initializer byParameter(int nth) {
- ParamInitializer i = new ParamInitializer();
- i.nthParam = nth;
- return i;
- }
-
- /**
- * Makes an initializer creating a new object.
- *
- * <p>This initializer creates a new object and uses it as the initial
- * value of the field. The constructor of the created object receives
- * the parameter:
- *
- * <ul><code>Object obj</code> - the object including the field.<br>
- * </ul>
- *
- * <p>If the initialized field is static, then the constructor does
- * not receive any parameters.
- *
- * @param objectType the class instantiated for the initial value.
- */
- public static Initializer byNew(CtClass objectType) {
- NewInitializer i = new NewInitializer();
- i.objectType = objectType;
- i.stringParams = null;
- i.withConstructorParams = false;
- return i;
- }
-
- /**
- * Makes an initializer creating a new object.
- *
- * <p>This initializer creates a new object and uses it as the initial
- * value of the field. The constructor of the created object receives
- * the parameters:
- *
- * <ul><code>Object obj</code> - the object including the field.<br>
- * <code>String[] strs</code> - the character strings specified
- * by <code>stringParams</code><br>
- * </ul>
- *
- * <p>If the initialized field is static, then the constructor
- * receives only <code>strs</code>.
- *
- * @param objectType the class instantiated for the initial value.
- * @param stringParams the array of strings passed to the
- * constructor.
- */
- public static Initializer byNew(CtClass objectType,
- String[] stringParams) {
- NewInitializer i = new NewInitializer();
- i.objectType = objectType;
- i.stringParams = stringParams;
- i.withConstructorParams = false;
- return i;
- }
-
- /**
- * Makes an initializer creating a new object.
- *
- * <p>This initializer creates a new object and uses it as the initial
- * value of the field. The constructor of the created object receives
- * the parameters:
- *
- * <ul><code>Object obj</code> - the object including the field.<br>
- * <code>Object[] args</code> - the parameters passed to the
- * constructor of the object including the
- * filed.
- * </ul>
- *
- * <p>If the initialized field is static, then the constructor does
- * not receive any parameters.
- *
- * @param objectType the class instantiated for the initial value.
- *
- * @see javassist.CtField.Initializer#byNewArray(CtClass,int)
- * @see javassist.CtField.Initializer#byNewArray(CtClass,int[])
- */
- public static Initializer byNewWithParams(CtClass objectType) {
- NewInitializer i = new NewInitializer();
- i.objectType = objectType;
- i.stringParams = null;
- i.withConstructorParams = true;
- return i;
- }
-
- /**
- * Makes an initializer creating a new object.
- *
- * <p>This initializer creates a new object and uses it as the initial
- * value of the field. The constructor of the created object receives
- * the parameters:
- *
- * <ul><code>Object obj</code> - the object including the field.<br>
- * <code>String[] strs</code> - the character strings specified
- * by <code>stringParams</code><br>
- * <code>Object[] args</code> - the parameters passed to the
- * constructor of the object including the
- * filed.
- * </ul>
- *
- * <p>If the initialized field is static, then the constructor receives
- * only <code>strs</code>.
- *
- * @param objectType the class instantiated for the initial value.
- * @param stringParams the array of strings passed to the
- * constructor.
- */
- public static Initializer byNewWithParams(CtClass objectType,
- String[] stringParams) {
- NewInitializer i = new NewInitializer();
- i.objectType = objectType;
- i.stringParams = stringParams;
- i.withConstructorParams = true;
- return i;
- }
-
- /**
- * Makes an initializer calling a static method.
- *
- * <p>This initializer calls a static method and uses the returned
- * value as the initial value of the field.
- * The called method receives the parameters:
- *
- * <ul><code>Object obj</code> - the object including the field.<br>
- * </ul>
- *
- * <p>If the initialized field is static, then the method does
- * not receive any parameters.
- *
- * <p>The type of the returned value must be the same as the field
- * type.
- *
- * @param methodClass the class that the static method is
- * declared in.
- * @param methodName the name of the satic method.
- */
- public static Initializer byCall(CtClass methodClass,
- String methodName) {
- MethodInitializer i = new MethodInitializer();
- i.objectType = methodClass;
- i.methodName = methodName;
- i.stringParams = null;
- i.withConstructorParams = false;
- return i;
- }
-
- /**
- * Makes an initializer calling a static method.
- *
- * <p>This initializer calls a static method and uses the returned
- * value as the initial value of the field. The called method
- * receives the parameters:
- *
- * <ul><code>Object obj</code> - the object including the field.<br>
- * <code>String[] strs</code> - the character strings specified
- * by <code>stringParams</code><br>
- * </ul>
- *
- * <p>If the initialized field is static, then the method
- * receive only <code>strs</code>.
- *
- * <p>The type of the returned value must be the same as the field
- * type.
- *
- * @param methodClass the class that the static method is
- * declared in.
- * @param methodName the name of the satic method.
- * @param stringParams the array of strings passed to the
- * static method.
- */
- public static Initializer byCall(CtClass methodClass,
- String methodName,
- String[] stringParams) {
- MethodInitializer i = new MethodInitializer();
- i.objectType = methodClass;
- i.methodName = methodName;
- i.stringParams = stringParams;
- i.withConstructorParams = false;
- return i;
- }
-
- /**
- * Makes an initializer calling a static method.
- *
- * <p>This initializer calls a static method and uses the returned
- * value as the initial value of the field. The called method
- * receives the parameters:
- *
- * <ul><code>Object obj</code> - the object including the field.<br>
- * <code>Object[] args</code> - the parameters passed to the
- * constructor of the object including the
- * filed.
- * </ul>
- *
- * <p>If the initialized field is static, then the method does
- * not receive any parameters.
- *
- * <p>The type of the returned value must be the same as the field
- * type.
- *
- * @param methodClass the class that the static method is
- * declared in.
- * @param methodName the name of the satic method.
- */
- public static Initializer byCallWithParams(CtClass methodClass,
- String methodName) {
- MethodInitializer i = new MethodInitializer();
- i.objectType = methodClass;
- i.methodName = methodName;
- i.stringParams = null;
- i.withConstructorParams = true;
- return i;
- }
-
- /**
- * Makes an initializer calling a static method.
- *
- * <p>This initializer calls a static method and uses the returned
- * value as the initial value of the field. The called method
- * receives the parameters:
- *
- * <ul><code>Object obj</code> - the object including the field.<br>
- * <code>String[] strs</code> - the character strings specified
- * by <code>stringParams</code><br>
- * <code>Object[] args</code> - the parameters passed to the
- * constructor of the object including the
- * filed.
- * </ul>
- *
- * <p>If the initialized field is static, then the method
- * receive only <code>strs</code>.
- *
- * <p>The type of the returned value must be the same as the field
- * type.
- *
- * @param methodClass the class that the static method is
- * declared in.
- * @param methodName the name of the satic method.
- * @param stringParams the array of strings passed to the
- * static method.
- */
- public static Initializer byCallWithParams(CtClass methodClass,
- String methodName, String[] stringParams) {
- MethodInitializer i = new MethodInitializer();
- i.objectType = methodClass;
- i.methodName = methodName;
- i.stringParams = stringParams;
- i.withConstructorParams = true;
- return i;
- }
-
- /**
- * Makes an initializer creating a new array.
- *
- * @param type the type of the array.
- * @param size the size of the array.
- * @throws NotFoundException if the type of the array components
- * is not found.
- */
- public static Initializer byNewArray(CtClass type, int size)
- throws NotFoundException
- {
- return new ArrayInitializer(type.getComponentType(), size);
- }
-
- /**
- * Makes an initializer creating a new multi-dimensional array.
- *
- * @param type the type of the array.
- * @param sizes an <code>int</code> array of the size in every
- * dimension.
- * The first element is the size in the first
- * dimension. The second is in the second, etc.
- */
- public static Initializer byNewArray(CtClass type, int[] sizes) {
- return new MultiArrayInitializer(type, sizes);
- }
-
- /**
- * Makes an initializer.
- *
- * @param source initializer expression.
- */
- public static Initializer byExpr(String source) {
- return new CodeInitializer(source);
- }
-
- static Initializer byExpr(ASTree source) {
- return new PtreeInitializer(source);
- }
-
- // Check whether this initializer is valid for the field type.
- // If it is invaild, this method throws an exception.
- void check(CtClass type) throws CannotCompileException {}
-
- // produce codes for initialization
- abstract int compile(CtClass type, String name, Bytecode code,
- CtClass[] parameters, Javac drv)
- throws CannotCompileException;
-
- // produce codes for initialization
- abstract int compileIfStatic(CtClass type, String name,
- Bytecode code, Javac drv) throws CannotCompileException;
-
- // returns the index of CONSTANT_Integer_info etc
- // if the value is constant. Otherwise, 0.
- int getConstantValue(ConstPool cp, CtClass type) { return 0; }
- }
-
- static abstract class CodeInitializer0 extends Initializer {
- abstract void compileExpr(Javac drv) throws CompileError;
-
- int compile(CtClass type, String name, Bytecode code,
- CtClass[] parameters, Javac drv)
- throws CannotCompileException
- {
- try {
- code.addAload(0);
- compileExpr(drv);
- code.addPutfield(Bytecode.THIS, name, Descriptor.of(type));
- return code.getMaxStack();
- }
- catch (CompileError e) {
- throw new CannotCompileException(e);
- }
- }
-
- int compileIfStatic(CtClass type, String name, Bytecode code,
- Javac drv) throws CannotCompileException
- {
- try {
- compileExpr(drv);
- code.addPutstatic(Bytecode.THIS, name, Descriptor.of(type));
- return code.getMaxStack();
- }
- catch (CompileError e) {
- throw new CannotCompileException(e);
- }
- }
-
- int getConstantValue2(ConstPool cp, CtClass type, ASTree tree) {
- if (type.isPrimitive()) {
- if (tree instanceof IntConst) {
- long value = ((IntConst)tree).get();
- if (type == CtClass.doubleType)
- return cp.addDoubleInfo((double)value);
- else if (type == CtClass.floatType)
- return cp.addFloatInfo((float)value);
- else if (type == CtClass.longType)
- return cp.addLongInfo(value);
- else if (type != CtClass.voidType)
- return cp.addIntegerInfo((int)value);
- }
- else if (tree instanceof DoubleConst) {
- double value = ((DoubleConst)tree).get();
- if (type == CtClass.floatType)
- return cp.addFloatInfo((float)value);
- else if (type == CtClass.doubleType)
- return cp.addDoubleInfo(value);
- }
- }
- else if (tree instanceof StringL
- && type.getName().equals(javaLangString))
- return cp.addStringInfo(((StringL)tree).get());
-
- return 0;
- }
- }
-
- static class CodeInitializer extends CodeInitializer0 {
- private String expression;
-
- CodeInitializer(String expr) { expression = expr; }
-
- void compileExpr(Javac drv) throws CompileError {
- drv.compileExpr(expression);
- }
-
- int getConstantValue(ConstPool cp, CtClass type) {
- try {
- ASTree t = Javac.parseExpr(expression, new SymbolTable());
- return getConstantValue2(cp, type, t);
- }
- catch (CompileError e) {
- return 0;
- }
- }
- }
-
- static class PtreeInitializer extends CodeInitializer0 {
- private ASTree expression;
-
- PtreeInitializer(ASTree expr) { expression = expr; }
-
- void compileExpr(Javac drv) throws CompileError {
- drv.compileExpr(expression);
- }
-
- int getConstantValue(ConstPool cp, CtClass type) {
- return getConstantValue2(cp, type, expression);
- }
- }
-
- /**
- * A field initialized with a parameter passed to the constructor
- * of the class containing that field.
- */
- static class ParamInitializer extends Initializer {
- int nthParam;
-
- ParamInitializer() {}
-
- int compile(CtClass type, String name, Bytecode code,
- CtClass[] parameters, Javac drv)
- throws CannotCompileException
- {
- if (parameters != null && nthParam < parameters.length) {
- code.addAload(0);
- int nth = nthParamToLocal(nthParam, parameters, false);
- int s = code.addLoad(nth, type) + 1;
- code.addPutfield(Bytecode.THIS, name, Descriptor.of(type));
- return s; // stack size
- }
- else
- return 0; // do not initialize
- }
-
- /**
- * Computes the index of the local variable that the n-th parameter
- * is assigned to.
- *
- * @param nth n-th parameter
- * @param params list of parameter types
- * @param isStatic true if the method is static.
- */
- static int nthParamToLocal(int nth, CtClass[] params,
- boolean isStatic) {
- CtClass longType = CtClass.longType;
- CtClass doubleType = CtClass.doubleType;
- int k;
- if (isStatic)
- k = 0;
- else
- k = 1; // 0 is THIS.
-
- for (int i = 0; i < nth; ++i) {
- CtClass type = params[i];
- if (type == longType || type == doubleType)
- k += 2;
- else
- ++k;
- }
-
- return k;
- }
-
- int compileIfStatic(CtClass type, String name, Bytecode code,
- Javac drv) throws CannotCompileException
- {
- return 0;
- }
- }
-
- /**
- * A field initialized with an object created by the new operator.
- */
- static class NewInitializer extends Initializer {
- CtClass objectType;
- String[] stringParams;
- boolean withConstructorParams;
-
- NewInitializer() {}
-
- /**
- * Produces codes in which a new object is created and assigned to
- * the field as the initial value.
- */
- int compile(CtClass type, String name, Bytecode code,
- CtClass[] parameters, Javac drv)
- throws CannotCompileException
- {
- int stacksize;
-
- code.addAload(0);
- code.addNew(objectType);
- code.add(Bytecode.DUP);
- code.addAload(0);
-
- if (stringParams == null)
- stacksize = 4;
- else
- stacksize = compileStringParameter(code) + 4;
-
- if (withConstructorParams)
- stacksize += CtNewWrappedMethod.compileParameterList(code,
- parameters, 1);
-
- code.addInvokespecial(objectType, "<init>", getDescriptor());
- code.addPutfield(Bytecode.THIS, name, Descriptor.of(type));
- return stacksize;
- }
-
- private String getDescriptor() {
- final String desc3
- = "(Ljava/lang/Object;[Ljava/lang/String;[Ljava/lang/Object;)V";
-
- if (stringParams == null)
- if (withConstructorParams)
- return "(Ljava/lang/Object;[Ljava/lang/Object;)V";
- else
- return "(Ljava/lang/Object;)V";
- else
- if (withConstructorParams)
- return desc3;
- else
- return "(Ljava/lang/Object;[Ljava/lang/String;)V";
- }
-
- /**
- * Produces codes for a static field.
- */
- int compileIfStatic(CtClass type, String name, Bytecode code,
- Javac drv) throws CannotCompileException
- {
- String desc;
-
- code.addNew(objectType);
- code.add(Bytecode.DUP);
-
- int stacksize = 2;
- if (stringParams == null)
- desc = "()V";
- else {
- desc = "([Ljava/lang/String;)V";
- stacksize += compileStringParameter(code);
- }
-
- code.addInvokespecial(objectType, "<init>", desc);
- code.addPutstatic(Bytecode.THIS, name, Descriptor.of(type));
- return stacksize;
- }
-
- protected final int compileStringParameter(Bytecode code)
- throws CannotCompileException
- {
- int nparam = stringParams.length;
- code.addIconst(nparam);
- code.addAnewarray(javaLangString);
- for (int j = 0; j < nparam; ++j) {
- code.add(Bytecode.DUP); // dup
- code.addIconst(j); // iconst_<j>
- code.addLdc(stringParams[j]); // ldc ...
- code.add(Bytecode.AASTORE); // aastore
- }
-
- return 4;
- }
-
- }
-
- /**
- * A field initialized with the result of a static method call.
- */
- static class MethodInitializer extends NewInitializer {
- String methodName;
- // the method class is specified by objectType.
-
- MethodInitializer() {}
-
- /**
- * Produces codes in which a new object is created and assigned to
- * the field as the initial value.
- */
- int compile(CtClass type, String name, Bytecode code,
- CtClass[] parameters, Javac drv)
- throws CannotCompileException
- {
- int stacksize;
-
- code.addAload(0);
- code.addAload(0);
-
- if (stringParams == null)
- stacksize = 2;
- else
- stacksize = compileStringParameter(code) + 2;
-
- if (withConstructorParams)
- stacksize += CtNewWrappedMethod.compileParameterList(code,
- parameters, 1);
-
- String typeDesc = Descriptor.of(type);
- String mDesc = getDescriptor() + typeDesc;
- code.addInvokestatic(objectType, methodName, mDesc);
- code.addPutfield(Bytecode.THIS, name, typeDesc);
- return stacksize;
- }
-
- private String getDescriptor() {
- final String desc3
- = "(Ljava/lang/Object;[Ljava/lang/String;[Ljava/lang/Object;)";
-
- if (stringParams == null)
- if (withConstructorParams)
- return "(Ljava/lang/Object;[Ljava/lang/Object;)";
- else
- return "(Ljava/lang/Object;)";
- else
- if (withConstructorParams)
- return desc3;
- else
- return "(Ljava/lang/Object;[Ljava/lang/String;)";
- }
-
- /**
- * Produces codes for a static field.
- */
- int compileIfStatic(CtClass type, String name, Bytecode code,
- Javac drv) throws CannotCompileException
- {
- String desc;
-
- int stacksize = 1;
- if (stringParams == null)
- desc = "()";
- else {
- desc = "([Ljava/lang/String;)";
- stacksize += compileStringParameter(code);
- }
-
- String typeDesc = Descriptor.of(type);
- code.addInvokestatic(objectType, methodName, desc + typeDesc);
- code.addPutstatic(Bytecode.THIS, name, typeDesc);
- return stacksize;
- }
- }
-
- static class IntInitializer extends Initializer {
- int value;
-
- IntInitializer(int v) { value = v; }
-
- void check(CtClass type) throws CannotCompileException {
- if (type != CtClass.intType)
- throw new CannotCompileException("type mismatch");
- }
-
- int compile(CtClass type, String name, Bytecode code,
- CtClass[] parameters, Javac drv)
- throws CannotCompileException
- {
- code.addAload(0);
- code.addIconst(value);
- code.addPutfield(Bytecode.THIS, name, Descriptor.of(type));
- return 2; // stack size
- }
-
- int compileIfStatic(CtClass type, String name, Bytecode code,
- Javac drv) throws CannotCompileException
- {
- code.addIconst(value);
- code.addPutstatic(Bytecode.THIS, name, Descriptor.of(type));
- return 1; // stack size
- }
-
- int getConstantValue(ConstPool cp, CtClass type) {
- if (type == CtClass.intType)
- return cp.addIntegerInfo(value);
- else
- return 0;
- }
- }
-
- static class LongInitializer extends Initializer {
- long value;
-
- LongInitializer(long v) { value = v; }
-
- void check(CtClass type) throws CannotCompileException {
- if (type != CtClass.longType)
- throw new CannotCompileException("type mismatch");
- }
-
- int compile(CtClass type, String name, Bytecode code,
- CtClass[] parameters, Javac drv)
- throws CannotCompileException
- {
- code.addAload(0);
- code.addLdc2w(value);
- code.addPutfield(Bytecode.THIS, name, Descriptor.of(type));
- return 3; // stack size
- }
-
- int compileIfStatic(CtClass type, String name, Bytecode code,
- Javac drv) throws CannotCompileException
- {
- code.addLdc2w(value);
- code.addPutstatic(Bytecode.THIS, name, Descriptor.of(type));
- return 2; // stack size
- }
-
- int getConstantValue(ConstPool cp, CtClass type) {
- if (type == CtClass.longType)
- return cp.addLongInfo(value);
- else
- return 0;
- }
- }
-
- static class DoubleInitializer extends Initializer {
- double value;
-
- DoubleInitializer(double v) { value = v; }
-
- void check(CtClass type) throws CannotCompileException {
- if (type != CtClass.doubleType)
- throw new CannotCompileException("type mismatch");
- }
-
- int compile(CtClass type, String name, Bytecode code,
- CtClass[] parameters, Javac drv)
- throws CannotCompileException
- {
- code.addAload(0);
- code.addLdc2w(value);
- code.addPutfield(Bytecode.THIS, name, Descriptor.of(type));
- return 3; // stack size
- }
-
- int compileIfStatic(CtClass type, String name, Bytecode code,
- Javac drv) throws CannotCompileException
- {
- code.addLdc2w(value);
- code.addPutstatic(Bytecode.THIS, name, Descriptor.of(type));
- return 2; // stack size
- }
-
- int getConstantValue(ConstPool cp, CtClass type) {
- if (type == CtClass.doubleType)
- return cp.addDoubleInfo(value);
- else
- return 0;
- }
- }
-
- static class StringInitializer extends Initializer {
- String value;
-
- StringInitializer(String v) { value = v; }
-
- void check(CtClass type) throws CannotCompileException {
- if (!type.getName().equals(javaLangString))
- throw new CannotCompileException("type mismatch");
- }
-
- int compile(CtClass type, String name, Bytecode code,
- CtClass[] parameters, Javac drv)
- throws CannotCompileException
- {
- code.addAload(0);
- code.addLdc(value);
- code.addPutfield(Bytecode.THIS, name, Descriptor.of(type));
- return 2; // stack size
- }
-
- int compileIfStatic(CtClass type, String name, Bytecode code,
- Javac drv) throws CannotCompileException
- {
- code.addLdc(value);
- code.addPutstatic(Bytecode.THIS, name, Descriptor.of(type));
- return 1; // stack size
- }
-
- int getConstantValue(ConstPool cp, CtClass type) {
- if (type.getName().equals(javaLangString))
- return cp.addStringInfo(value);
- else
- return 0;
- }
- }
-
- static class ArrayInitializer extends Initializer {
- CtClass type;
- int size;
-
- ArrayInitializer(CtClass t, int s) { type = t; size = s; }
-
- private void addNewarray(Bytecode code) {
- if (type.isPrimitive())
- code.addNewarray(((CtPrimitiveType)type).getArrayType(),
- size);
- else
- code.addAnewarray(type, size);
- }
-
- int compile(CtClass type, String name, Bytecode code,
- CtClass[] parameters, Javac drv)
- throws CannotCompileException
- {
- code.addAload(0);
- addNewarray(code);
- code.addPutfield(Bytecode.THIS, name, Descriptor.of(type));
- return 2; // stack size
- }
-
- int compileIfStatic(CtClass type, String name, Bytecode code,
- Javac drv) throws CannotCompileException
- {
- addNewarray(code);
- code.addPutstatic(Bytecode.THIS, name, Descriptor.of(type));
- return 1; // stack size
- }
- }
-
- static class MultiArrayInitializer extends Initializer {
- CtClass type;
- int[] dim;
-
- MultiArrayInitializer(CtClass t, int[] d) { type = t; dim = d; }
-
- void check(CtClass type) throws CannotCompileException {
- if (!type.isArray())
- throw new CannotCompileException("type mismatch");
- }
-
- int compile(CtClass type, String name, Bytecode code,
- CtClass[] parameters, Javac drv)
- throws CannotCompileException
- {
- code.addAload(0);
- int s = code.addMultiNewarray(type, dim);
- code.addPutfield(Bytecode.THIS, name, Descriptor.of(type));
- return s + 1; // stack size
- }
-
- int compileIfStatic(CtClass type, String name, Bytecode code,
- Javac drv) throws CannotCompileException
- {
- int s = code.addMultiNewarray(type, dim);
- code.addPutstatic(Bytecode.THIS, name, Descriptor.of(type));
- return s; // stack size
- }
- }
- }
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