/**************************************************************************************
* Copyright (c) Jonas Bon�r, Alexandre Vasseur. All rights reserved. *
* http://aspectwerkz.codehaus.org *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the LGPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package org.codehaus.aspectwerkz.transform.inlining;
import org.codehaus.aspectwerkz.util.ContextClassLoader;
import org.codehaus.aspectwerkz.reflect.ClassInfo;
import org.codehaus.aspectwerkz.reflect.MethodInfo;
import org.codehaus.aspectwerkz.reflect.ConstructorInfo;
import org.codehaus.aspectwerkz.reflect.FieldInfo;
import org.codehaus.aspectwerkz.reflect.impl.java.JavaClassInfo;
import org.codehaus.aspectwerkz.transform.TransformationConstants;
import org.codehaus.aspectwerkz.transform.AspectWerkzPreProcessor;
import org.codehaus.aspectwerkz.exception.WrappedRuntimeException;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.CodeVisitor;
import org.objectweb.asm.Type;
import org.objectweb.asm.Label;
import org.objectweb.asm.ClassReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
/**
* Helper class with utility methods for the ASM library.
*
* @author <a href="mailto:jboner@codehaus.org">Jonas Bon�r </a>
* @author <a href="mailto:alex@gnilux.com">Alexandre Vasseur </a>
*/
public class AsmHelper implements TransformationConstants {
public final static ClassInfo INTEGER = JavaClassInfo.getClassInfo(Integer.TYPE);
public final static ClassInfo VOID = JavaClassInfo.getClassInfo(Void.TYPE);
public final static ClassInfo BOOLEAN = JavaClassInfo.getClassInfo(Boolean.TYPE);
public final static ClassInfo BYTE = JavaClassInfo.getClassInfo(Byte.TYPE);
public final static ClassInfo CHARACTER = JavaClassInfo.getClassInfo(Character.TYPE);
public final static ClassInfo SHORT = JavaClassInfo.getClassInfo(Short.TYPE);
public final static ClassInfo DOUBLE = JavaClassInfo.getClassInfo(Double.TYPE);
public final static ClassInfo FLOAT = JavaClassInfo.getClassInfo(Float.TYPE);
public final static ClassInfo LONG = JavaClassInfo.getClassInfo(Long.TYPE);
/**
* A boolean to check if we have a J2SE 5 support
*/
public final static boolean IS_JAVA_5;
public static int JAVA_VERSION = V1_3;
static {
Class annotation = null;
try {
annotation = Class.forName("java.lang.annotation.Annotation");
ClassReader cr = new ClassReader("java.lang.annotation.Annotation");
JAVA_VERSION = V1_5;
} catch (Throwable e) {
annotation = null;
}
if (annotation == null) {
IS_JAVA_5 = false;
} else {
IS_JAVA_5 = true;
}
}
/**
* Factory method for ASM ClassWriter and J2SE 5 support
* See http://www.objectweb.org/wws/arc/asm/2004-08/msg00005.html
*
* @param computeMax
* @return
*/
public static ClassWriter newClassWriter(boolean computeMax) {
return new ClassWriter(computeMax, true);
}
/**
* Gets the argument types for a constructor. <p/>Parts of code in this method is taken from the ASM codebase.
*
* @param constructor
* @return the ASM argument types for the constructor
*/
public static Type[] getArgumentTypes(final Constructor constructor) {
Class[] classes = constructor.getParameterTypes();
Type[] types = new Type[classes.length];
for (int i = classes.length - 1; i >= 0; --i) {
types[i] = Type.getType(classes[i]);
}
return types;
}
/**
* Dumps an ASM class to disk.
*
* @param dumpDir
* @param className
* @param bytes
* @throws java.io.IOException
*/
public static void dumpClass(final String dumpDir, final String className, final byte[] bytes)
throws IOException {
File dir = new File(dumpDir + File.separator + className.substring(0, className.lastIndexOf('/')));
dir.mkdirs();
String fileName = dumpDir + File.separator + className + ".class";
if (AspectWerkzPreProcessor.VERBOSE) {
System.out.println("AW INFO: dumping class " + className + " to " + dumpDir);
}
FileOutputStream os = new FileOutputStream(fileName);
os.write(bytes);
os.close();
}
/**
* Dumps an ASM class to disk.
*
* @param dumpDir
* @param className
* @param cw
* @throws java.io.IOException
*/
public static void dumpClass(final String dumpDir, final String className, final ClassWriter cw)
throws IOException {
File dir = new File(dumpDir + File.separator + className.substring(0, className.lastIndexOf('/')));
dir.mkdirs();
String fileName = dumpDir + File.separator + className + ".class";
if (AspectWerkzPreProcessor.VERBOSE) {
System.out.println("AW INFO: dumping class " + className + " to " + dumpDir);
}
FileOutputStream os = new FileOutputStream(fileName);
os.write(cw.toByteArray());
os.close();
}
/**
* Adds a class to a class loader and loads it.
*
* @param loader the class loader (if null the context class loader will be used)
* @param bytes the bytes for the class
* @param name the name of the class
* @return the class
*/
public static Class loadClass(ClassLoader loader, final byte[] bytes, final String name) {
String className = name.replace('/', '.');
try {
if (loader == null) {
loader = ContextClassLoader.getLoader();
}
Class klass = loader.loadClass(CLASS_LOADER_REFLECT_CLASS_NAME);
Method method = klass.getDeclaredMethod(
DEFINE_CLASS_METHOD_NAME, new Class[]{
String.class, byte[].class, int.class, int.class
}
);
// TODO: what if we don't have rights to set this method to
// accessible on this specific CL? Load it in System CL?
method.setAccessible(true);
Object[] args = new Object[]{
className, bytes, new Integer(0), new Integer(bytes.length)
};
Class clazz = (Class) method.invoke(loader, args);
method.setAccessible(false);
return clazz;
} catch (InvocationTargetException e) {
// JIT failovering for Thread concurrency
// AW-222 (Tomcat and WLS were reported for AW-222)
if (e.getTargetException() instanceof LinkageError) {
Class failoverJoinpointClass = loadClass(loader, className);
if (failoverJoinpointClass != null) {
return failoverJoinpointClass;
}
}
throw new WrappedRuntimeException(e);
} catch (Exception e) {
throw new WrappedRuntimeException(e);
}
}
/**
* Tries to load a class if unsuccessful returns null.
*
* @param loader the class loader
* @param name the name of the class
* @return the class
*/
public static Class loadClass(ClassLoader loader, final String name) {
String className = name.replace('/', '.');
try {
if (loader == null) {
loader = ContextClassLoader.getLoader();
}
// Use Class.forName since loader.loadClass fails on JBoss UCL
return Class.forName(className, false, loader);
} catch (Exception e) {
return null;
}
}
/**
* Calculates the method hash. The computation MUST be the same as in ReflectHelper, thus we switch back the names
* to Java style. Note that for array type, Java.reflect is using "[Lpack.foo;" style unless primitive.
*
* @param name
* @param desc
* @return
*/
public static int calculateMethodHash(final String name, final String desc) {
int hash = 17;
hash = (37 * hash) + name.replace('/', '.').hashCode();
Type[] argumentTypes = Type.getArgumentTypes(desc);
for (int i = 0; i < argumentTypes.length; i++) {
hash = (37 * hash)
+ AsmHelper.convertTypeDescToReflectDesc(argumentTypes[i].getDescriptor()).hashCode();
}
return hash;
}
/**
* Calculates the constructor hash.
*
* @param desc
* @return
*/
public static int calculateConstructorHash(final String desc) {
return AsmHelper.calculateMethodHash(INIT_METHOD_NAME, desc);
}
/**
* Calculates the joinpoint constructor call/execution hash.
* It depends on the callee class name else we won't be able to distinguish joinpoint on different targets.
*
* @param declaringClassName
* @param desc
* @return
*/
public static int calculateConstructorJoinPointHash(final String declaringClassName, final String desc) {
int hash = 17;
hash = (37 * hash) + AsmHelper.calculateClassHash("L" + declaringClassName + ";");
hash = (37 * hash) + AsmHelper.calculateMethodHash(INIT_METHOD_NAME, desc);
return hash;
}
/**
* Calculates the field hash.
*
* @param name
* @param desc
* @return
*/
public static int calculateFieldHash(final String name, final String desc) {
int hash = 17;
hash = (37 * hash) + name.hashCode();
Type type = Type.getType(desc);
hash = (37 * hash) + AsmHelper.convertTypeDescToReflectDesc(type.getDescriptor()).hashCode();
return hash;
}
/**
* Calculates the class hash.
*
* @param declaringType
* @return
*/
public static int calculateClassHash(final String declaringType) {
return AsmHelper.convertTypeDescToReflectDesc(declaringType).hashCode();
}
/**
* Converts an internal Java array type name ([Lblabla) to the a the format used by the expression matcher
* (blabla[])
*
* @param typeName is type name
* @return
*/
public static String convertArrayTypeName(final String typeName) {
int index = typeName.lastIndexOf('[');
if (index != -1) {
StringBuffer arrayType = new StringBuffer();
if (typeName.endsWith("I")) {
arrayType.append("int");
} else if (typeName.endsWith("J")) {
arrayType.append("long");
} else if (typeName.endsWith("S")) {
arrayType.append("short");
} else if (typeName.endsWith("F")) {
arrayType.append("float");
} else if (typeName.endsWith("D")) {
arrayType.append("double");
} else if (typeName.endsWith("Z")) {
arrayType.append("boolean");
} else if (typeName.endsWith("C")) {
arrayType.append("char");
} else if (typeName.endsWith("B")) {
arrayType.append("byte");
} else {
arrayType.append(typeName.substring(index + 2, typeName.length() - 1));
}
for (int i = 0; i < (index + 1); i++) {
arrayType.append("[]");
}
return arrayType.toString();
} else {
return typeName;
}
}
/**
* Converts an ASM type descriptor" (I, [I, [Ljava/lang/String;, Ljava/lang/String;) to a Java.reflect one (int, [I,
* [Ljava.lang.String;, java.lang.String)
*
* @param typeDesc
* @return the Java.reflect string representation
*/
public static String convertTypeDescToReflectDesc(final String typeDesc) {
if (typeDesc == null) {
return null;
}
String result = null;
// change needed for array types only
if (typeDesc.startsWith("[")) {
result = typeDesc;
} else {
// support for single dimension type
if (typeDesc.startsWith("L") && typeDesc.endsWith(";")) {
result = typeDesc.substring(1, typeDesc.length() - 1);
} else {
// primitive type, single dimension
if (typeDesc.equals("I")) {
result = "int";
} else if (typeDesc.equals("J")) {
result = "long";
} else if (typeDesc.equals("S")) {
result = "short";
} else if (typeDesc.equals("F")) {
result = "float";
} else if (typeDesc.equals("D")) {
result = "double";
} else if (typeDesc.equals("Z")) {
result = "boolean";
} else if (typeDesc.equals("C")) {
result = "char";
} else if (typeDesc.equals("B")) {
result = "byte";
} else {
throw new RuntimeException("unknown primitive type " + typeDesc);
}
}
}
return result.replace('/', '.');
}
/**
* Converts a java reflect type desc to ASM type desc.
*
* @param desc
* @return
*/
public static String convertReflectDescToTypeDesc(final String desc) {
if (desc == null) {
return null;
}
String typeDesc = desc;
int dimension = 0;
char[] arr = desc.toCharArray();
for (int i = 0; i < arr.length; i++) {
if (arr[i] == ']') {
dimension++;
}
}
typeDesc = desc.substring(0, desc.length() - dimension * 2);
if (typeDesc.equals("int")) {
typeDesc = "I";
} else if (typeDesc.equals("short")) {
typeDesc = "S";
} else if (typeDesc.equals("long")) {
typeDesc = "J";
} else if (typeDesc.equals("float")) {
typeDesc = "F";
} else if (typeDesc.equals("double")) {
typeDesc = "D";
} else if (typeDesc.equals("byte")) {
typeDesc = "B";
} else if (typeDesc.equals("char")) {
typeDesc = "C";
} else if (typeDesc.equals("boolean")) {
typeDesc = "Z";
} else {
typeDesc = 'L' + typeDesc + ';';
}
for (int i = 0; i < dimension; i++) {
typeDesc = '[' + typeDesc;
}
return typeDesc.replace('.', '/');
}
/**
* Adds the correct return statement.
*
* @param mv
* @param type
*/
public static void addReturnStatement(final CodeVisitor mv, final Type type) {
switch (type.getSort()) {
case Type.VOID:
mv.visitInsn(RETURN);
break;
case Type.LONG:
mv.visitInsn(LRETURN);
break;
case Type.INT:
mv.visitInsn(IRETURN);
break;
case Type.SHORT:
mv.visitInsn(IRETURN);
break;
case Type.DOUBLE:
mv.visitInsn(DRETURN);
break;
case Type.FLOAT:
mv.visitInsn(FRETURN);
break;
case Type.BYTE:
mv.visitInsn(IRETURN);
break;
case Type.BOOLEAN:
mv.visitInsn(IRETURN);
break;
case Type.CHAR:
mv.visitInsn(IRETURN);
break;
case Type.ARRAY:
mv.visitInsn(ARETURN);
break;
case Type.OBJECT:
mv.visitInsn(ARETURN);
break;
}
}
/**
* Loads argument types.
*
* @param mv
* @param argumentTypes
*/
public static void loadArgumentTypes(final CodeVisitor mv, final Type[] argumentTypes, final boolean staticMethod) {
int index;
if (staticMethod) {
index = 0;
} else {
index = 1;
}
for (int i = 0; i < argumentTypes.length; i++) {
index = loadType(mv, index, argumentTypes[i]);
}
}
/**
* Loads a type.
*
* @param cv
* @param index
* @param type
* @return the incremented index
*/
public static int loadType(final CodeVisitor cv, int index, final Type type) {
switch (type.getSort()) {
case Type.LONG:
cv.visitVarInsn(LLOAD, index++);
index++;
break;
case Type.INT:
cv.visitVarInsn(ILOAD, index++);
break;
case Type.SHORT:
cv.visitVarInsn(ILOAD, index++);
break;
case Type.DOUBLE:
cv.visitVarInsn(DLOAD, index++);
index++;
break;
case Type.FLOAT:
cv.visitVarInsn(FLOAD, index++);
break;
case Type.BYTE:
cv.visitVarInsn(ILOAD, index++);
break;
case Type.BOOLEAN:
cv.visitVarInsn(ILOAD, index++);
break;
case Type.CHAR:
cv.visitVarInsn(ILOAD, index++);
break;
case Type.ARRAY:
cv.visitVarInsn(ALOAD, index++);
break;
case Type.OBJECT:
cv.visitVarInsn(ALOAD, index++);
break;
}
return index;
}
/**
* Stores a type.
*
* @param cv
* @param index
* @param type
* @return the incremented index
*/
public static int storeType(final CodeVisitor cv, int index, final Type type) {
switch (type.getSort()) {
case Type.VOID:
break;
case Type.LONG:
cv.visitVarInsn(LSTORE, index++);
index++;
break;
case Type.INT:
cv.visitVarInsn(ISTORE, index++);
break;
case Type.SHORT:
cv.visitVarInsn(ISTORE, index++);
break;
case Type.DOUBLE:
cv.visitVarInsn(DSTORE, index++);
index++;
break;
case Type.FLOAT:
cv.visitVarInsn(FSTORE, index++);
break;
case Type.BYTE:
cv.visitVarInsn(ISTORE, index++);
break;
case Type.BOOLEAN:
cv.visitVarInsn(ISTORE, index++);
break;
case Type.CHAR:
cv.visitVarInsn(ISTORE, index++);
break;
case Type.ARRAY:
cv.visitVarInsn(ASTORE, index++);
break;
case Type.OBJECT:
cv.visitVarInsn(ASTORE, index++);
break;
}
return index;
}
/**
* Creates and adds the correct parameter index for integer types.
*
* @param cv
* @param index
*/
public static void loadIntegerConstant(final CodeVisitor cv, final int index) {
switch (index) {
case 0:
cv.visitInsn(ICONST_0);
break;
case 1:
cv.visitInsn(ICONST_1);
break;
case 2:
cv.visitInsn(ICONST_2);
break;
case 3:
cv.visitInsn(ICONST_3);
break;
case 4:
cv.visitInsn(ICONST_4);
break;
case 5:
cv.visitInsn(ICONST_5);
break;
default:
cv.visitIntInsn(BIPUSH, index);
break;
}
}
/**
* Prepares the wrapping or a primitive type.
*
* @param cv
* @param type
*/
public static void prepareWrappingOfPrimitiveType(final CodeVisitor cv, final Type type) {
switch (type.getSort()) {
case Type.SHORT:
cv.visitTypeInsn(NEW, SHORT_CLASS_NAME);
cv.visitInsn(DUP);
break;
case Type.INT:
cv.visitTypeInsn(NEW, INTEGER_CLASS_NAME);
cv.visitInsn(DUP);
break;
case Type.LONG:
cv.visitTypeInsn(NEW, LONG_CLASS_NAME);
cv.visitInsn(DUP);
break;
case Type.FLOAT:
cv.visitTypeInsn(NEW, FLOAT_CLASS_NAME);
cv.visitInsn(DUP);
break;
case Type.DOUBLE:
cv.visitTypeInsn(NEW, DOUBLE_CLASS_NAME);
cv.visitInsn(DUP);
break;
case Type.BYTE:
cv.visitTypeInsn(NEW, BYTE_CLASS_NAME);
cv.visitInsn(DUP);
break;
case Type.BOOLEAN:
cv.visitTypeInsn(NEW, BOOLEAN_CLASS_NAME);
cv.visitInsn(DUP);
break;
case Type.CHAR:
cv.visitTypeInsn(NEW, CHARACTER_CLASS_NAME);
cv.visitInsn(DUP);
break;
}
}
/**
* Handles the wrapping of a primitive type.
*
* @param cv
* @param type
*/
public static void wrapPrimitiveType(final CodeVisitor cv, final Type type) {
switch (type.getSort()) {
case Type.VOID:
cv.visitInsn(ACONST_NULL);
break;
case Type.SHORT:
cv.visitMethodInsn(
INVOKESPECIAL,
SHORT_CLASS_NAME,
INIT_METHOD_NAME,
SHORT_CLASS_INIT_METHOD_SIGNATURE
);
break;
case Type.INT:
cv.visitMethodInsn(
INVOKESPECIAL,
INTEGER_CLASS_NAME,
INIT_METHOD_NAME,
INTEGER_CLASS_INIT_METHOD_SIGNATURE
);
break;
case Type.LONG:
cv.visitMethodInsn(INVOKESPECIAL, LONG_CLASS_NAME, INIT_METHOD_NAME, LONG_CLASS_INIT_METHOD_SIGNATURE);
break;
case Type.FLOAT:
cv.visitMethodInsn(
INVOKESPECIAL,
FLOAT_CLASS_NAME,
INIT_METHOD_NAME,
FLOAT_CLASS_INIT_METHOD_SIGNATURE
);
break;
case Type.DOUBLE:
cv.visitMethodInsn(
INVOKESPECIAL,
DOUBLE_CLASS_NAME,
INIT_METHOD_NAME,
DOUBLE_CLASS_INIT_METHOD_SIGNATURE
);
break;
case Type.BYTE:
cv.visitMethodInsn(INVOKESPECIAL, BYTE_CLASS_NAME, INIT_METHOD_NAME, BYTE_CLASS_INIT_METHOD_SIGNATURE);
break;
case Type.BOOLEAN:
cv.visitMethodInsn(
INVOKESPECIAL,
BOOLEAN_CLASS_NAME,
INIT_METHOD_NAME,
BOOLEAN_CLASS_INIT_METHOD_SIGNATURE
);
break;
case Type.CHAR:
cv.visitMethodInsn(
INVOKESPECIAL,
CHARACTER_CLASS_NAME,
INIT_METHOD_NAME,
CHARACTER_CLASS_INIT_METHOD_SIGNATURE
);
break;
}
}
/**
* Handles the unwrapping of a type, unboxing of primitives and casting to the correct object type.
* Takes care of null value replaced by default primitive value.
* <pre>(obj==null)?0L:((Long)obj).longValue();</pre>
*
* @param cv
* @param type
*/
public static void unwrapType(final CodeVisitor cv, final Type type) {
// void, object and array type handling
switch (type.getSort()) {
case Type.OBJECT:
String objectTypeName = type.getClassName().replace('.', '/');
cv.visitTypeInsn(CHECKCAST, objectTypeName);
return;
case Type.ARRAY:
cv.visitTypeInsn(CHECKCAST, type.getDescriptor());
return;
case Type.VOID:
return;
}
// primitive type handling
Label l0If = new Label();
Label l1End = new Label();
// if != null
cv.visitInsn(DUP);
cv.visitJumpInsn(IFNONNULL, l0If);
// else, default value
cv.visitInsn(POP);
addDefaultValue(cv, type);
// end
cv.visitJumpInsn(GOTO, l1End);
// if body
cv.visitLabel(l0If);
switch (type.getSort()) {
case Type.SHORT:
cv.visitTypeInsn(CHECKCAST, SHORT_CLASS_NAME);
cv.visitMethodInsn(
INVOKEVIRTUAL,
SHORT_CLASS_NAME,
SHORT_VALUE_METHOD_NAME,
SHORT_VALUE_METHOD_SIGNATURE
);
break;
case Type.INT:
cv.visitTypeInsn(CHECKCAST, INTEGER_CLASS_NAME);
cv.visitMethodInsn(
INVOKEVIRTUAL,
INTEGER_CLASS_NAME,
INT_VALUE_METHOD_NAME,
INT_VALUE_METHOD_SIGNATURE
);
break;
case Type.LONG:
cv.visitTypeInsn(CHECKCAST, LONG_CLASS_NAME);
cv.visitMethodInsn(
INVOKEVIRTUAL, LONG_CLASS_NAME, LONG_VALUE_METHOD_NAME, LONG_VALUE_METHOD_SIGNATURE
);
break;
case Type.FLOAT:
cv.visitTypeInsn(CHECKCAST, FLOAT_CLASS_NAME);
cv.visitMethodInsn(
INVOKEVIRTUAL,
FLOAT_CLASS_NAME,
FLOAT_VALUE_METHOD_NAME,
FLOAT_VALUE_METHOD_SIGNATURE
);
break;
case Type.DOUBLE:
cv.visitTypeInsn(CHECKCAST, DOUBLE_CLASS_NAME);
cv.visitMethodInsn(
INVOKEVIRTUAL,
DOUBLE_CLASS_NAME,
DOUBLE_VALUE_METHOD_NAME,
DOUBLE_VALUE_METHOD_SIGNATURE
);
break;
case Type.BYTE:
cv.visitTypeInsn(CHECKCAST, BYTE_CLASS_NAME);
cv.visitMethodInsn(
INVOKEVIRTUAL, BYTE_CLASS_NAME, BYTE_VALUE_METHOD_NAME, BYTE_VALUE_METHOD_SIGNATURE
);
break;
case Type.BOOLEAN:
cv.visitTypeInsn(CHECKCAST, BOOLEAN_CLASS_NAME);
cv.visitMethodInsn(
INVOKEVIRTUAL,
BOOLEAN_CLASS_NAME,
BOOLEAN_VALUE_METHOD_NAME,
BOOLEAN_VALUE_METHOD_SIGNATURE
);
break;
case Type.CHAR:
cv.visitTypeInsn(CHECKCAST, CHARACTER_CLASS_NAME);
cv.visitMethodInsn(
INVOKEVIRTUAL,
CHARACTER_CLASS_NAME,
CHAR_VALUE_METHOD_NAME,
CHAR_VALUE_METHOD_SIGNATURE
);
break;
}
cv.visitLabel(l1End);
}
/**
* Adds the default value for a type.
*
* @param cv
* @param type
*/
public static void addDefaultValue(final CodeVisitor cv, final Type type) {
switch (type.getSort()) {
case Type.OBJECT:
cv.visitInsn(ACONST_NULL);
break;
case Type.ARRAY:
cv.visitInsn(ACONST_NULL);
break;
case Type.INT:
cv.visitInsn(ICONST_0);
break;
case Type.LONG:
cv.visitInsn(LCONST_0);
break;
case Type.SHORT:
cv.visitInsn(ICONST_0);
break;
case Type.FLOAT:
cv.visitInsn(FCONST_0);
break;
case Type.DOUBLE:
cv.visitInsn(DCONST_0);
break;
case Type.BYTE:
cv.visitInsn(ICONST_0);
break;
case Type.BOOLEAN:
cv.visitInsn(ICONST_0);
break;
case Type.CHAR:
cv.visitInsn(ICONST_0);
break;
}
}
/**
* Adds a string and inserts null if the string is null.
*
* @param cv
* @param value
*/
public static void addNullableString(final CodeVisitor cv, final String value) {
if (value == null) {
cv.visitInsn(ACONST_NULL);
} else {
cv.visitLdcInsn(value);
}
}
/**
* Compute the register depth, based on an array of types (long, double = 2 bytes address)
*
* @param typesOnStack
* @return depth of the stack
*/
public static int getRegisterDepth(final Type[] typesOnStack) {
int depth = 0;
for (int i = 0; i < typesOnStack.length; i++) {
Type type = typesOnStack[i];
depth++;
switch (type.getSort()) {
case Type.LONG:
depth++;
break;
case Type.DOUBLE:
depth++;
break;
}
}
return depth;
}
/**
* Compute the index on the stack of a given argument based on its index in the signature
*
* @param typesOnStack
* @param typeIndex
* @return
*/
public static int getRegisterIndexOf(final Type[] typesOnStack, final int typeIndex) {
int depth = 0;
for (int i = 0; i < typeIndex; i++) {
Type type = typesOnStack[i];
depth++;
switch (type.getSort()) {
case Type.LONG:
depth++;
break;
case Type.DOUBLE:
depth++;
break;
}
}
return depth;
}
/**
* Compute the index on the signature of a given argument based on its index as if it was on the stack
* where the stack would start at the first argument
*
* @param typesOnStack
* @param registerIndex
* @return
*/
public static int getTypeIndexOf(final Type[] typesOnStack, final int registerIndex) {
for (int i = 0; i < typesOnStack.length; i++) {
int presumedRegisterIndex = getRegisterIndexOf(typesOnStack, i);
if (registerIndex == presumedRegisterIndex) {
return i;
}
}
return -1;
}
/**
* Checks if the Type is a primitive.
*
* @param returnType
* @return TRUE/FALSE
*/
public static boolean isPrimitive(final Type returnType) {
if (returnType.getSort() == Type.INT ||
returnType.getSort() == Type.SHORT ||
returnType.getSort() == Type.LONG ||
returnType.getSort() == Type.FLOAT ||
returnType.getSort() == Type.DOUBLE ||
returnType.getSort() == Type.BYTE ||
returnType.getSort() == Type.CHAR ||
returnType.getSort() == Type.BOOLEAN ||
returnType.getSort() == Type.VOID) {
return true;
} else {
return false;
}
}
/**
* Increments the index (takes doubles and longs in to account).
*
* @param index
* @param type
* @return the incremented index
*/
public static int incrementIndex(int index, final Type type) {
if (type.getSort() == Type.LONG || type.getSort() == Type.DOUBLE) {
index += 2;
} else {
index++;
}
return index;
}
/**
* Returns the descriptor corresponding to the given method info.
* Adapted from ASM Type.getMethodDescriptor(<Method>)
*
* @param method
* @return the descriptor of the given method.
*/
public static String getMethodDescriptor(final MethodInfo method) {
ClassInfo[] parameters = method.getParameterTypes();
StringBuffer buf = new StringBuffer();
buf.append('(');
for (int i = 0; i < parameters.length; ++i) {
getClassDescriptor(buf, parameters[i]);
}
buf.append(')');
getClassDescriptor(buf, method.getReturnType());
return buf.toString();
}
/**
* Returns the descriptor corresponding to the given constructor info.
*
* @param constructor
* @return the descriptor of the given constructor.
*/
public static String getConstructorDescriptor(final ConstructorInfo constructor) {
ClassInfo[] parameters = constructor.getParameterTypes();
StringBuffer buf = new StringBuffer();
buf.append('(');
for (int i = 0; i < parameters.length; ++i) {
getClassDescriptor(buf, parameters[i]);
}
buf.append(')');
getClassDescriptor(buf, VOID);
return buf.toString();
}
/**
* Returns the descriptor corresponding to the given field info.
*
* @param field
* @return the descriptor of the given field.
*/
public static String getFieldDescriptor(final FieldInfo field) {
return getClassDescriptor(field.getType());
}
/**
* Returns the descriptor corresponding to the given Java type.
* Adapted from ASM Type.getClassDescriptor(Class)
* <p/>
* TODO remove the delegation to private method
*
* @param c an object class, a primitive class or an array class.
* @return the descriptor corresponding to the given class.
*/
public static String getClassDescriptor(final ClassInfo c) {
StringBuffer buf = new StringBuffer();
getClassDescriptor(buf, c);
return buf.toString();
}
/**
* Appends the descriptor of the given class to the given string buffer.
* Adapted from ASM Type.getClassDescriptor(StringBuffer, Class)
*
* @param buf the string buffer to which the descriptor must be appended.
* @param klass the class whose descriptor must be computed.
*/
private static void getClassDescriptor(final StringBuffer buf, final ClassInfo klass) {
ClassInfo d = klass;
while (true) {
if (d.isPrimitive()) {
char car;
if (d.equals(INTEGER)) {
car = 'I';
} else if (d.equals(VOID)) {
car = 'V';
} else if (d.equals(BOOLEAN)) {
car = 'Z';
} else if (d.equals(BYTE)) {
car = 'B';
} else if (d.equals(CHARACTER)) {
car = 'C';
} else if (d.equals(SHORT)) {
car = 'S';
} else if (d.equals(DOUBLE)) {
car = 'D';
} else if (d.equals(FLOAT)) {
car = 'F';
} else if (d.equals(LONG)) {
car = 'J';
} else {
throw new Error("should not happen");
}
buf.append(car);
return;
} else if (d.isArray()) {
buf.append('[');
d = d.getComponentType();
} else {
buf.append('L');
String name = d.getName();
int len = name.length();
for (int i = 0; i < len; ++i) {
char car = name.charAt(i);
buf.append(car == '.' ? '/' : car);
}
buf.append(';');
return;
}
}
}
/**
* Returns the Java types corresponding to the argument types of the given
* method.
* Adapted from ASM getArgumentTypes(Method)
*
* @param method a method.
* @return the Java types corresponding to the argument types of the given
* method.
*/
public static Type[] getArgumentTypes(final MethodInfo method) {
ClassInfo[] classes = method.getParameterTypes();
Type[] types = new Type[classes.length];
for (int i = classes.length - 1; i >= 0; --i) {
types[i] = getType(classes[i]);
}
return types;
}
/**
* Returns the Java type corresponding to the given class.
* Adapted from ASM getType(Class)
*
* @param c a class.
* @return the Java type corresponding to the given class.
*/
public static Type getType(final ClassInfo c) {
if (c.isPrimitive()) {
if (c.equals(INTEGER)) {
return Type.INT_TYPE;
} else if (c.equals(VOID)) {
return Type.VOID_TYPE;
} else if (c.equals(BOOLEAN)) {
return Type.BOOLEAN_TYPE;
} else if (c.equals(BYTE)) {
return Type.BYTE_TYPE;
} else if (c.equals(CHARACTER)) {
return Type.CHAR_TYPE;
} else if (c.equals(SHORT)) {
return Type.SHORT_TYPE;
} else if (c.equals(DOUBLE)) {
return Type.DOUBLE_TYPE;
} else if (c.equals(FLOAT)) {
return Type.FLOAT_TYPE;
} else if (c.equals(LONG)) {
return Type.LONG_TYPE;
} else {
throw new Error("should not happen");
}
} else {
return Type.getType(getClassDescriptor(c));
}
}
}