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Jackson (https://github.com/FasterXML/jackson) extension module
used to enhance performance using bytecode generation to replace use of Reflection for
field access and method calls
package com.fasterxml.jackson.module.afterburner.deser;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import org.objectweb.asm.*;
import static org.objectweb.asm.Opcodes.*;
import com.fasterxml.jackson.databind.deser.SettableBeanProperty;
import com.fasterxml.jackson.databind.introspect.AnnotatedField;
import com.fasterxml.jackson.module.afterburner.util.DynamicPropertyAccessorBase;
import com.fasterxml.jackson.module.afterburner.util.MyClassLoader;
/**
* Simple collector used to keep track of properties for which code-generated
* mutators are needed.
*/
public class PropertyMutatorCollector
extends DynamicPropertyAccessorBase
{
private final ArrayList _intSetters = new ArrayList();
private final ArrayList _longSetters = new ArrayList();
private final ArrayList _stringSetters = new ArrayList();
private final ArrayList _objectSetters = new ArrayList();
private final ArrayList _intFields = new ArrayList();
private final ArrayList _longFields = new ArrayList();
private final ArrayList _stringFields = new ArrayList();
private final ArrayList _objectFields = new ArrayList();
public PropertyMutatorCollector() { }
/*
/**********************************************************
/* Methods for collecting properties
/**********************************************************
*/
public SettableIntMethodProperty addIntSetter(SettableBeanProperty prop) {
return _add(_intSetters, new SettableIntMethodProperty(prop, null, _intSetters.size()));
}
public SettableLongMethodProperty addLongSetter(SettableBeanProperty prop) {
return _add(_longSetters, new SettableLongMethodProperty(prop, null, _longSetters.size()));
}
public SettableStringMethodProperty addStringSetter(SettableBeanProperty prop) {
return _add(_stringSetters, new SettableStringMethodProperty(prop, null, _stringSetters.size()));
}
public SettableObjectMethodProperty addObjectSetter(SettableBeanProperty prop) {
return _add(_objectSetters, new SettableObjectMethodProperty(prop, null, _objectSetters.size()));
}
public SettableIntFieldProperty addIntField(SettableBeanProperty prop) {
return _add(_intFields, new SettableIntFieldProperty(prop, null, _intFields.size()));
}
public SettableLongFieldProperty addLongField(SettableBeanProperty prop) {
return _add(_longFields, new SettableLongFieldProperty(prop, null, _longFields.size()));
}
public SettableStringFieldProperty addStringField(SettableBeanProperty prop) {
return _add(_stringFields, new SettableStringFieldProperty(prop, null, _stringFields.size()));
}
public SettableObjectFieldProperty addObjectField(SettableBeanProperty prop) {
return _add(_objectFields, new SettableObjectFieldProperty(prop, null, _objectFields.size()));
}
public boolean isEmpty() {
return _intSetters.isEmpty()
&& _longSetters.isEmpty()
&& _stringSetters.isEmpty()
&& _objectSetters.isEmpty()
&& _intFields.isEmpty()
&& _longFields.isEmpty()
&& _stringFields.isEmpty()
&& _objectFields.isEmpty()
;
}
/*
/**********************************************************
/* Code generation; high level
/**********************************************************
*/
/**
* Method for building generic mutator class for specified bean
* type.
*/
public BeanPropertyMutator buildMutator(Class beanType,
MyClassLoader classLoader)
{
// if we weren't passed a class loader, we will base it on value type CL, try to use parent
if (classLoader == null) {
classLoader = new MyClassLoader(beanType.getClassLoader(), true);
}
String srcName = beanType.getName() + "$Access4JacksonDeserializer";
String generatedClass = internalClassName(srcName);
Class accessorClass = null;
try {
accessorClass = classLoader.loadClass(srcName);
} catch (ClassNotFoundException e) { }
if (accessorClass == null) {
accessorClass = generateMutatorClass(beanType, classLoader, srcName, generatedClass);
}
try {
return (BeanPropertyMutator) accessorClass.newInstance();
} catch (Exception e) {
throw new IllegalStateException("Failed to generate accessor class '"+srcName+"': "+e.getMessage(), e);
}
}
public Class generateMutatorClass(Class beanType,
MyClassLoader classLoader, String srcName, String generatedClass)
{
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
String superClass = internalClassName(BeanPropertyMutator.class.getName());
// muchos important: level at least 1.5 to get generics!!!
cw.visit(V1_5, ACC_PUBLIC + ACC_SUPER, generatedClass, null, superClass, null);
cw.visitSource(srcName + ".java", null);
// add default (no-arg) constructor:
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, superClass, "", "()V");
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0); // don't care (real values: 1,1)
mv.visitEnd();
final String beanClass = internalClassName(beanType.getName());
// and then add various accessors; first field accessors:
if (!_intFields.isEmpty()) {
_addIntFields(cw, _intFields, beanClass);
}
if (!_longFields.isEmpty()) {
_addLongFields(cw, _longFields, beanClass);
}
if (!_stringFields.isEmpty()) {
_addStringFields(cw, _stringFields, beanClass);
}
if (!_objectFields.isEmpty()) {
_addObjectFields(cw, _objectFields, beanClass);
}
// and then method accessors:
if (!_intSetters.isEmpty()) {
_addIntSetters(cw, _intSetters, beanClass);
}
if (!_longSetters.isEmpty()) {
_addLongSetters(cw, _longSetters, beanClass);
}
if (!_stringSetters.isEmpty()) {
_addStringSetters(cw, _stringSetters, beanClass);
}
if (!_objectSetters.isEmpty()) {
_addObjectSetters(cw, _objectSetters, beanClass);
}
cw.visitEnd();
byte[] byteCode = cw.toByteArray();
return classLoader.loadAndResolve(srcName, byteCode);
}
/*
/**********************************************************
/* Code generation; method-based getters
/**********************************************************
*/
private static void _addIntSetters(ClassWriter cw, List props,
String beanClass)
{
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "intSetter", "(Ljava/lang/Object;II)V", /*generic sig*/null, null);
mv.visitCode();
// first: cast bean to proper type
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, beanClass);
mv.visitVarInsn(ASTORE, 4); // 3 args (0 == this), so 4 is the first local var slot
// Ok; minor optimization, 4 or less accessors, just do IFs; over that, use switch
if (props.size() <= 4) {
_addSettersUsingIf(mv, props, beanClass, ILOAD, 4, false);
} else {
_addSettersUsingSwitch(mv, props, beanClass, ILOAD, 4, false);
}
// and if no match, generate exception:
generateException(mv, beanClass, props.size());
mv.visitMaxs(0, 0); // don't care (real values: 1,1)
mv.visitEnd();
}
private static void _addLongSetters(ClassWriter cw, List props,
String beanClass)
{
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "longSetter", "(Ljava/lang/Object;IJ)V", /*generic sig*/null, null);
mv.visitCode();
// first: cast bean to proper type
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, beanClass);
mv.visitVarInsn(ASTORE, 5); // 3 args (0 == this), so 5 is the first local var slot for long
if (props.size() <= 4) {
_addSettersUsingIf(mv, props, beanClass, LLOAD, 5, false);
} else {
_addSettersUsingSwitch(mv, props, beanClass, LLOAD, 5, false);
}
// and if no match, generate exception:
generateException(mv, beanClass, props.size());
mv.visitMaxs(0, 0); // don't care (real values: 1,1)
mv.visitEnd();
}
private static void _addStringSetters(ClassWriter cw, List props,
String beanClass)
{
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "stringSetter", "(Ljava/lang/Object;ILjava/lang/String;)V", null, null);
mv.visitCode();
// first: cast bean to proper type
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, beanClass);
mv.visitVarInsn(ASTORE, 4); // 3 args (0 == this), so 4 is the first local var slot
if (props.size() <= 4) {
_addSettersUsingIf(mv, props, beanClass, ALOAD, 4, false);
} else {
_addSettersUsingSwitch(mv, props, beanClass, ALOAD, 4, false);
}
generateException(mv, beanClass, props.size());
mv.visitMaxs(0, 0);
mv.visitEnd();
}
private static void _addObjectSetters(ClassWriter cw, List props,
String beanClass)
{
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "objectSetter", "(Ljava/lang/Object;ILjava/lang/Object;)V", null, null);
mv.visitCode();
// first: cast bean to proper type
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, beanClass);
mv.visitVarInsn(ASTORE, 4); // 3 args (0 == this), so 4 is the first local var slot
if (props.size() <= 4) {
_addSettersUsingIf(mv, props, beanClass, ALOAD, 4, true);
} else {
_addSettersUsingSwitch(mv, props, beanClass, ALOAD, 4, true);
}
generateException(mv, beanClass, props.size());
mv.visitMaxs(0, 0);
mv.visitEnd();
}
/*
/**********************************************************
/* Code generation; field-based getters
/**********************************************************
*/
private static void _addIntFields(ClassWriter cw, List props,
String beanClass)
{
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "intField", "(Ljava/lang/Object;II)V", /*generic sig*/null, null);
mv.visitCode();
// first: cast bean to proper type
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, beanClass);
mv.visitVarInsn(ASTORE, 4); // 3 args (0 == this), so 4 is the first local var slot
// Ok; minor optimization, less than 4 accessors, just do IFs; over that, use switch
if (props.size() < 4) {
_addFieldsUsingIf(mv, props, beanClass, ILOAD, 4, false);
} else {
_addFieldsUsingSwitch(mv, props, beanClass, ILOAD, 4, false);
}
// and if no match, generate exception:
generateException(mv, beanClass, props.size());
mv.visitMaxs(0, 0); // don't care (real values: 1,1)
mv.visitEnd();
}
private static void _addLongFields(ClassWriter cw, List props,
String beanClass)
{
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "longField", "(Ljava/lang/Object;IJ)V", null, null);
mv.visitCode();
// first: cast bean to proper type
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, beanClass);
mv.visitVarInsn(ASTORE, 5); // 3 args (0 == this), BUT longs use up 2 slots; hence 5
if (props.size() < 4) {
_addFieldsUsingIf(mv, props, beanClass, LLOAD, 5, false);
} else {
_addFieldsUsingSwitch(mv, props, beanClass, LLOAD, 5, false);
}
// and if no match, generate exception:
generateException(mv, beanClass, props.size());
mv.visitMaxs(0, 0); // don't care (real values: 1,1)
mv.visitEnd();
}
private static void _addStringFields(ClassWriter cw, List props,
String beanClass)
{
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "stringField", "(Ljava/lang/Object;ILjava/lang/String;)V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, beanClass);
mv.visitVarInsn(ASTORE, 4);
if (props.size() < 4) {
_addFieldsUsingIf(mv, props, beanClass, ALOAD, 4, false);
} else {
_addFieldsUsingSwitch(mv, props, beanClass, ALOAD, 4, false);
}
generateException(mv, beanClass, props.size());
mv.visitMaxs(0, 0);
mv.visitEnd();
}
private static void _addObjectFields(ClassWriter cw, List props,
String beanClass)
{
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "objectField", "(Ljava/lang/Object;ILjava/lang/Object;)V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, beanClass);
mv.visitVarInsn(ASTORE, 4);
if (props.size() < 4) {
_addFieldsUsingIf(mv, props, beanClass, ALOAD, 4, true);
} else {
_addFieldsUsingSwitch(mv, props, beanClass, ALOAD, 4, true);
}
generateException(mv, beanClass, props.size());
mv.visitMaxs(0, 0);
mv.visitEnd();
}
/*
/**********************************************************
/* Helper methods, method accessor creation
/**********************************************************
*/
private static > void _addSettersUsingIf(MethodVisitor mv,
List props, String beanClass, int loadValueCode, int beanIndex,
boolean mustCast)
{
mv.visitVarInsn(ILOAD, 2); // load second arg (index)
Label next = new Label();
// first: check if 'index == 0'
mv.visitJumpInsn(IFNE, next); // "if not zero, goto L (skip stuff)"
// call first getter:
mv.visitVarInsn(ALOAD, beanIndex); // load local for cast bean
mv.visitVarInsn(loadValueCode, 3);
Method method = (Method) (props.get(0).getMember().getMember());
Type type = Type.getType(method.getParameterTypes()[0]);
if (mustCast) {
mv.visitTypeInsn(CHECKCAST, type.getInternalName());
}
// to fix [Issue-5] (don't assume return type is 'void'), we need to:
Class returnType = method.getReturnType();
String returnTypeStr = (returnType == Void.class) ? "V"
: Type.getType(returnType).getDescriptor();
mv.visitMethodInsn(INVOKEVIRTUAL, beanClass, method.getName(), "("+type.getDescriptor()+")"+returnTypeStr);
mv.visitInsn(RETURN);
// And from this point on, loop a bit
for (int i = 1, len = props.size(); i < len; ++i) {
mv.visitLabel(next);
next = new Label();
mv.visitVarInsn(ILOAD, 2); // load second arg (index)
mv.visitInsn(ALL_INT_CONSTS[i]);
mv.visitJumpInsn(IF_ICMPNE, next);
mv.visitVarInsn(ALOAD, beanIndex); // load bean
mv.visitVarInsn(loadValueCode, 3);
method = (Method) (props.get(i).getMember().getMember());
type = Type.getType(method.getParameterTypes()[0]);
if (mustCast) {
mv.visitTypeInsn(CHECKCAST, type.getInternalName());
}
mv.visitMethodInsn(INVOKEVIRTUAL, beanClass, method.getName(), "("+type.getDescriptor()+")V");
mv.visitInsn(RETURN);
}
mv.visitLabel(next);
}
private static > void _addSettersUsingSwitch(MethodVisitor mv,
List props, String beanClass, int loadValueCode, int beanIndex,
boolean mustCast)
{
mv.visitVarInsn(ILOAD, 2); // load second arg (index)
Label[] labels = new Label[props.size()];
for (int i = 0, len = labels.length; i < len; ++i) {
labels[i] = new Label();
}
Label defaultLabel = new Label();
mv.visitTableSwitchInsn(0, labels.length - 1, defaultLabel, labels);
for (int i = 0, len = labels.length; i < len; ++i) {
mv.visitLabel(labels[i]);
mv.visitVarInsn(ALOAD, beanIndex); // load bean
mv.visitVarInsn(loadValueCode, 3);
Method method = (Method) (props.get(i).getMember().getMember());
Type type = Type.getType(method.getParameterTypes()[0]);
if (mustCast) {
mv.visitTypeInsn(CHECKCAST, type.getInternalName());
}
mv.visitMethodInsn(INVOKEVIRTUAL, beanClass, method.getName(), "("+type.getDescriptor()+")V");
mv.visitInsn(RETURN);
}
mv.visitLabel(defaultLabel);
}
private static > void _addFieldsUsingIf(MethodVisitor mv,
List props, String beanClass, int loadValueCode, int beanIndex,
boolean mustCast)
{
mv.visitVarInsn(ILOAD, 2); // load second arg (index)
Label next = new Label();
// first: check if 'index == 0'
mv.visitJumpInsn(IFNE, next); // "if not zero, goto L (skip stuff)"
// first field accessor
mv.visitVarInsn(ALOAD, beanIndex); // load local for cast bean
mv.visitVarInsn(loadValueCode, 3);
AnnotatedField field = (AnnotatedField) props.get(0).getMember();
Type type = Type.getType(field.getRawType());
if (mustCast) {
mv.visitTypeInsn(CHECKCAST, type.getInternalName());
}
mv.visitFieldInsn(PUTFIELD, beanClass, field.getName(), type.getDescriptor());
mv.visitInsn(RETURN);
// And from this point on, loop a bit
for (int i = 1, len = props.size(); i < len; ++i) {
mv.visitLabel(next);
next = new Label();
mv.visitVarInsn(ILOAD, 2); // load second arg (index)
mv.visitInsn(ALL_INT_CONSTS[i]);
mv.visitJumpInsn(IF_ICMPNE, next);
mv.visitVarInsn(ALOAD, beanIndex); // load bean
mv.visitVarInsn(loadValueCode, 3);
field = (AnnotatedField) props.get(i).getMember();
type = Type.getType(field.getRawType());
if (mustCast) {
mv.visitTypeInsn(CHECKCAST, type.getInternalName());
}
mv.visitFieldInsn(PUTFIELD, beanClass, field.getName(), type.getDescriptor());
mv.visitInsn(RETURN);
}
mv.visitLabel(next);
}
private static > void _addFieldsUsingSwitch(MethodVisitor mv,
List props, String beanClass, int loadValueCode, int beanIndex,
boolean mustCast)
{
mv.visitVarInsn(ILOAD, 2); // load second arg (index)
Label[] labels = new Label[props.size()];
for (int i = 0, len = labels.length; i < len; ++i) {
labels[i] = new Label();
}
Label defaultLabel = new Label();
mv.visitTableSwitchInsn(0, labels.length - 1, defaultLabel, labels);
for (int i = 0, len = labels.length; i < len; ++i) {
mv.visitLabel(labels[i]);
mv.visitVarInsn(ALOAD, beanIndex); // load bean
mv.visitVarInsn(loadValueCode, 3); // put 'value' to stack
AnnotatedField field = (AnnotatedField) props.get(i).getMember();
Type type = Type.getType(field.getRawType());
if (mustCast) {
mv.visitTypeInsn(CHECKCAST, type.getInternalName());
}
mv.visitFieldInsn(PUTFIELD, beanClass, field.getName(), type.getDescriptor());
mv.visitInsn(RETURN);
}
mv.visitLabel(defaultLabel);
}
}
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