mirror of https://github.com/apache/openjpa.git
OPENJPA-2911 clearFields method via ASM
This commit is contained in:
Mark Struberg
parent
80272a3bf7
commit
4c7c81d249
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@ -50,6 +50,7 @@ import java.util.Iterator;
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import java.util.List;
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import java.util.Locale;
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import java.util.Map;
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import java.util.Optional;
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import java.util.Properties;
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import java.util.Set;
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import java.util.function.Predicate;
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@ -104,6 +105,7 @@ import org.apache.xbean.asm9.tree.AbstractInsnNode;
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import org.apache.xbean.asm9.tree.ClassNode;
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import org.apache.xbean.asm9.tree.FieldInsnNode;
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import org.apache.xbean.asm9.tree.FieldNode;
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import org.apache.xbean.asm9.tree.InsnList;
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import org.apache.xbean.asm9.tree.InsnNode;
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import org.apache.xbean.asm9.tree.LdcInsnNode;
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import org.apache.xbean.asm9.tree.MethodInsnNode;
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@ -583,15 +585,17 @@ public class PCEnhancer {
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processViolations();
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if (_meta != null) {
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final ClassNodeTracker classNodeTracker = AsmHelper.toClassNode(_pc);
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ClassNodeTracker classNodeTracker = AsmHelper.toClassNode(_pc);
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enhanceClass(classNodeTracker);
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addFields(classNodeTracker);
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//X TODO finish addStaticInitializer(classNodeTracker);
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AsmHelper.readIntoBCClass(classNodeTracker, _pc);
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addStaticInitializer();
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addPCMethods();
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classNodeTracker = AsmHelper.toClassNode(_pc);
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addPCMethods(classNodeTracker);
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addAccessors();
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addAttachDetachCode();
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addSerializationCode();
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@ -1332,9 +1336,11 @@ public class PCEnhancer {
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* <code>pcFetchObjectId</code>, etc are defined only in the
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* least-derived PersistenceCapable type.
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*/
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private void addPCMethods()
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throws NoSuchMethodException {
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addClearFieldsMethod();
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private void addPCMethods(ClassNodeTracker classNodeTracker) throws NoSuchMethodException {
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//X addClearFieldsMethod();
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addClearFieldsMethod(classNodeTracker.getClassNode());
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AsmHelper.readIntoBCClass(classNodeTracker, _pc);
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addNewInstanceMethod(true);
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addNewInstanceMethod(false);
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addManagedFieldCountMethod();
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@ -1384,56 +1390,54 @@ public class PCEnhancer {
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* the new instance method to ensure that unloaded fields have
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* default values.
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*/
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private void addClearFieldsMethod()
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throws NoSuchMethodException {
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private void addClearFieldsMethod(ClassNode classNode) throws NoSuchMethodException {
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// protected void pcClearFields ()
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BCMethod method = _pc.declareMethod(PRE + "ClearFields", void.class,
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null);
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method.makeProtected();
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Code code = method.getCode(true);
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MethodNode clearFieldMethod = new MethodNode(Opcodes.ACC_PROTECTED,
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PRE + "ClearFields",
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Type.getMethodDescriptor(Type.VOID_TYPE),
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null, null);
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// super.pcClearFields ()
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final InsnList instructions = clearFieldMethod.instructions;
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if (_meta.getPCSuperclass() != null && !getCreateSubclass()) {
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code.aload().setThis();
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code.invokespecial().setMethod(getType(_meta.
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getPCSuperclassMetaData()), PRE + "ClearFields", void.class,
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null);
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instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
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instructions.add(new MethodInsnNode(Opcodes.INVOKESPECIAL,
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Type.getInternalName(getType(_meta.getPCSuperclassMetaData())),
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PRE + "ClearFields",
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Type.getMethodDescriptor(Type.VOID_TYPE)));
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}
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FieldMetaData[] fmds = _meta.getDeclaredFields();
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for (FieldMetaData fmd : fmds) {
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if (fmd.getManagement() != FieldMetaData.MANAGE_PERSISTENT)
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if (fmd.getManagement() != FieldMetaData.MANAGE_PERSISTENT) {
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continue;
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loadManagedInstance(code, false);
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}
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instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
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switch (fmd.getDeclaredTypeCode()) {
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case JavaTypes.BOOLEAN:
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case JavaTypes.BYTE:
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case JavaTypes.CHAR:
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case JavaTypes.INT:
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case JavaTypes.SHORT:
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code.constant().setValue(0);
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instructions.add(getSetValueInsns(classNode, fmd, 0));
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break;
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case JavaTypes.DOUBLE:
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code.constant().setValue(0D);
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instructions.add(getSetValueInsns(classNode, fmd, 0D));
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break;
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case JavaTypes.FLOAT:
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code.constant().setValue(0F);
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instructions.add(getSetValueInsns(classNode, fmd, 0F));
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break;
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case JavaTypes.LONG:
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code.constant().setValue(0L);
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instructions.add(getSetValueInsns(classNode, fmd, 0L));
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break;
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default:
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code.constant().setNull();
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instructions.add(getSetValueInsns(classNode, fmd, null));
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break;
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}
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addSetManagedValueCode(code, fmd);
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}
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instructions.add(new InsnNode(Opcodes.RETURN));
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classNode.methods.add(clearFieldMethod);
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code.vreturn();
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code.calculateMaxStack();
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code.calculateMaxLocals();
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}
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/**
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@ -3161,11 +3165,7 @@ public class PCEnhancer {
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}
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}
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/**
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* Modifies the class initialization method (creating one if necessary)
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* to initialize the static fields of the PersistenceCapable instance and
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* to register it with the impl helper.
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*/
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@Deprecated
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private void addStaticInitializer() {
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Code code = getOrCreateClassInitCode(true);
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if (_meta.getPCSuperclass() != null) {
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@ -3252,6 +3252,112 @@ public class PCEnhancer {
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code.calculateMaxStack();
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}
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/**
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* Modifies the class initialization method (creating one if necessary)
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* to initialize the static fields of the PersistenceCapable instance and
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* to register it with the impl helper.
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*/
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private void addStaticInitializer(ClassNodeTracker classNodeTracker) {
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final ClassNode classNode = classNodeTracker.getClassNode();
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InsnList instructions = new InsnList();
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if (_meta.getPCSuperclass() != null) {
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if (getCreateSubclass()) {
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instructions.add(new LdcInsnNode(0));
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instructions.add(new FieldInsnNode(Opcodes.PUTFIELD, classNode.name, INHERIT, Type.getDescriptor(int.class)));
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}
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else {
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// pcInheritedFieldCount = <superClass>.pcGetManagedFieldCount()
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instructions.add(new MethodInsnNode(Opcodes.INVOKESTATIC, classNode.superName,
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PRE + "GetManagedFieldCount",
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Type.getMethodDescriptor(Type.INT_TYPE)));
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instructions.add(new FieldInsnNode(Opcodes.PUTFIELD, classNode.name, INHERIT, Type.getDescriptor(int.class)));
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}
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// pcPCSuperclass = <superClass>;
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// this intentionally calls getDescribedType() directly
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// instead of PCEnhancer.getType()
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instructions.add(new LdcInsnNode(Type.getInternalName(_meta.getPCSuperclassMetaData().getDescribedType())));
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instructions.add(new FieldInsnNode(Opcodes.PUTSTATIC, classNode.name, SUPER, Type.getDescriptor(Class.class)));
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}
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// pcFieldNames = new String[] { "<name1>", "<name2>", ... };
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FieldMetaData[] fmds = _meta.getDeclaredFields();
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/*
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// pcFieldNames = new String[] { "<name1>", "<name2>", ... };
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FieldMetaData[] fmds = _meta.getDeclaredFields();
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code.constant().setValue(fmds.length);
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code.anewarray().setType(String.class);
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for (int i = 0; i < fmds.length; i++) {
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code.dup();
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code.constant().setValue(i);
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code.constant().setValue(fmds[i].getName());
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code.aastore();
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}
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code.putstatic().setField(PRE + "FieldNames", String[].class);
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// pcFieldTypes = new Class[] { <type1>.class, <type2>.class, ... };
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code.constant().setValue(fmds.length);
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code.anewarray().setType(Class.class);
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for (int i = 0; i < fmds.length; i++) {
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code.dup();
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code.constant().setValue(i);
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code.classconstant().setClass(fmds[i].getDeclaredType());
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code.aastore();
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}
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code.putstatic().setField(PRE + "FieldTypes", Class[].class);
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// pcFieldFlags = new byte[] { <flag1>, <flag2>, ... };
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code.constant().setValue(fmds.length);
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code.newarray().setType(byte.class);
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for (int i = 0; i < fmds.length; i++) {
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code.dup();
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code.constant().setValue(i);
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code.constant().setValue(getFieldFlag(fmds[i]));
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code.bastore();
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}
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code.putstatic().setField(PRE + "FieldFlags", byte[].class);
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// PCRegistry.register (cls,
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// pcFieldNames, pcFieldTypes, pcFieldFlags,
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// pcPCSuperclass, alias, new XXX ());
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code.classconstant().setClass(_meta.getDescribedType());
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code.getstatic().setField(PRE + "FieldNames", String[].class);
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code.getstatic().setField(PRE + "FieldTypes", Class[].class);
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code.getstatic().setField(PRE + "FieldFlags", byte[].class);
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code.getstatic().setField(SUPER, Class.class);
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if (_meta.isMapped() || _meta.isAbstract())
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code.constant().setValue(_meta.getTypeAlias());
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else
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code.constant().setNull();
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if (_pc.isAbstract())
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code.constant().setNull();
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else {
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code.anew().setType(_pc);
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code.dup();
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code.invokespecial().setMethod("<init>", void.class, null);
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}
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code.invokestatic().setMethod(HELPERTYPE, "register", void.class,
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new Class[]{ Class.class, String[].class, Class[].class,
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byte[].class, Class.class, String.class, PCTYPE });
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code.vreturn();
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code.calculateMaxStack();
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*/
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// now add those instructions to the <clinit> method
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MethodNode clinit = getOrCreateClassInitMethod(classNode);
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final AbstractInsnNode retInsn = clinit.instructions.getLast();
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if (retInsn.getOpcode() != Opcodes.RETURN) {
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throw new IllegalStateException("Problem with parsing instructions. RETURN expected");
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}
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clinit.instructions.insertBefore(retInsn, instructions);
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}
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/**
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* Return the flag for the given field.
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*/
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@ -3755,6 +3861,31 @@ public class PCEnhancer {
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* Helper method to get the code for the class initializer method,
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* creating the method if it does not already exist.
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*/
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private MethodNode getOrCreateClassInitMethod(ClassNode classNode) {
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final Optional<MethodNode> clinitMethodNode = classNode.methods.stream()
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.filter(m -> m.name.equals("<clinit>"))
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.findFirst();
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if (clinitMethodNode.isPresent()) {
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return clinitMethodNode.get();
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}
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else {
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// add static initializer method if non exists
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MethodNode clinit = new MethodNode(Opcodes.ACC_STATIC | Opcodes.ACC_FINAL,
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"<clinit>",
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Type.getMethodDescriptor(Type.VOID_TYPE),
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null, null);
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clinit.instructions.add(new InsnNode(Opcodes.RETURN));
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classNode.methods.add(clinit);
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return clinit;
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}
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}
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/**
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* Helper method to get the code for the class initializer method,
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* creating the method if it does not already exist.
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*/
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@Deprecated
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private Code getOrCreateClassInitCode(boolean replaceLast) {
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BCMethod clinit = _pc.getDeclaredMethod("<clinit>");
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Code code;
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@ -4767,6 +4898,52 @@ public class PCEnhancer {
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}
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}
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/**
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* Store the given value into the field value specified
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* by <code>fmd</code>. Before this method is called, the data to load will
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* be on the top of the stack and the object that the data should be loaded
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* into will be second in the stack.
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*/
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private InsnList getSetValueInsns(ClassNode classNode, FieldMetaData fmd, Object value) {
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InsnList instructions = new InsnList();
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if (value == null) {
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instructions.add(new InsnNode(Opcodes.ACONST_NULL));
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}
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else {
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instructions.add(new LdcInsnNode(value));
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}
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// if redefining, then we must always reflect (or access the field
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// directly if accessible), since the redefined methods will always
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// trigger method calls to StateManager, even from internal direct-
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// access usage. We could work around this by not redefining, and
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// just do a subclass approach instead. But this is not a good option,
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// since it would sacrifice lazy loading and efficient dirty tracking.
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if (getRedefine() || isFieldAccess(fmd)) {
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instructions.add(new FieldInsnNode(Opcodes.PUTFIELD,
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Type.getInternalName(fmd.getDeclaringType()),
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fmd.getName(),
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Type.getDescriptor(fmd.getDeclaredType())));
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}
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else if (getCreateSubclass()) {
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// property access, and we're not redefining. invoke the
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// superclass method to bypass tracking.
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instructions.add(new MethodInsnNode(Opcodes.INVOKESPECIAL,
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Type.getInternalName(_managedType.getType()),
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getSetterName(fmd),
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Type.getMethodDescriptor(Type.VOID_TYPE, Type.getType(fmd.getDeclaredType()))));
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}
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else {
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// regular enhancement + property access
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instructions.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL,
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classNode.name,
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PRE + getSetterName(fmd),
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Type.getMethodDescriptor(Type.VOID_TYPE, Type.getType(fmd.getDeclaredType()))));
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}
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return instructions;
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}
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/**
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* Store the value at the top of the stack into the field value specified
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* by <code>fmd</code>. Before this method is called, the data to load will
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