Java tutorial
/** * Copyright 2004-2014 Riccardo Solmi. All rights reserved. * This file is part of the Whole Platform. * * The Whole Platform is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * The Whole Platform is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with the Whole Platform. If not, see <http://www.gnu.org/licenses/>. */ package org.whole.lang.bytecode.util; import java.util.Date; import org.objectweb.asm.*; import org.whole.lang.builders.BuilderConstants; import org.whole.lang.builders.IBuilder; import org.whole.lang.builders.IBuilderOperation; import org.whole.lang.contexts.IBuilderContext; import org.whole.lang.contexts.IEntityContext; import org.whole.lang.model.EnumValue; import org.whole.lang.reflect.EntityDescriptor; import org.whole.lang.reflect.FeatureDescriptor; import org.whole.lang.reflect.ILanguageKit; import org.whole.lang.templates.AbstractTemplateFactory; import org.whole.lang.templates.ITemplate; /** * @author Riccardo Solmi */ public class BytecodeStoreProducerBuilder implements IBuilder, Opcodes { // private List<ClassWriter> cwList = new ArrayList<ClassWriter>(); private ClassWriter cw; private MethodVisitor mv; private String builderInterfaceInternalName; private int varNum = 2; public byte[] getResult() { return cw.toByteArray(); } public static void visitIntInsn(MethodVisitor mv, int value) { switch (value) { case -1: mv.visitInsn(ICONST_M1); break; case 0: mv.visitInsn(ICONST_0); break; case 1: mv.visitInsn(ICONST_1); break; case 2: mv.visitInsn(ICONST_2); break; case 3: mv.visitInsn(ICONST_3); break; case 4: mv.visitInsn(ICONST_4); break; case 5: mv.visitInsn(ICONST_5); break; default: if (value >= Byte.MIN_VALUE && value <= Byte.MAX_VALUE) mv.visitIntInsn(BIPUSH, value); else mv.visitIntInsn(SIPUSH, value); } } public static String getInternalName(String type) { return Type.getType(type).getInternalName(); } public static String getMethodDescriptor(final Class<?> res, final Class<?> arg0) { final StringBuffer buf = new StringBuffer(); buf.append('('); buf.append(Type.getDescriptor(arg0)); buf.append(')'); buf.append(Type.getDescriptor(res)); return buf.toString(); } public void buildStartCompilationUnit(String packageName, String className) { cw = new ClassWriter(ClassWriter.COMPUTE_MAXS); String classInternalName = Type .getType(packageName.length() > 0 ? packageName + '.' + className : className).getInternalName(); String superInternalName = Type.getInternalName(AbstractTemplateFactory.class); cw.visit(V1_4, ACC_PUBLIC + ACC_SUPER, classInternalName, null, superInternalName, null); cw.visitSource(className + ".java", null); mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null); mv.visitCode(); mv.visitVarInsn(ALOAD, 0); mv.visitMethodInsn(INVOKESPECIAL, superInternalName, "<init>", "()V"); mv.visitInsn(RETURN); mv.visitEnd(); mv = cw.visitMethod(ACC_PUBLIC, "apply", getMethodDescriptor(Void.TYPE, IBuilderOperation.class), null, null); mv.visitCode(); } public void buildEndCompilationUnit() { mv.visitInsn(RETURN); mv.visitEnd(); } public void ensureBuilder(ILanguageKit languageKit) { //TODO } protected void buildGetBuilder(ILanguageKit languageKit, String builderType) { builderInterfaceInternalName = getInternalName(builderType); mv.visitVarInsn(ALOAD, 1); mv.visitLdcInsn(languageKit.getClass().getName()); mv.visitMethodInsn(INVOKEINTERFACE, Type.getInternalName(IBuilderOperation.class), "wGetBuilder", getMethodDescriptor(IBuilder.class, String.class)); mv.visitTypeInsn(CHECKCAST, builderInterfaceInternalName); mv.visitVarInsn(ASTORE, varNum); } public void wEntity_(EntityDescriptor<?> entityDesc) { ensureBuilder(entityDesc.getLanguageKit()); mv.visitVarInsn(ALOAD, varNum); mv.visitMethodInsn(INVOKEINTERFACE, builderInterfaceInternalName, BuilderConstants.startBuildName(entityDesc), "()V"); } public void wEntity_(EntityDescriptor<?> entityDesc, int initialCapacity) { ensureBuilder(entityDesc.getLanguageKit()); mv.visitVarInsn(ALOAD, varNum); visitIntInsn(mv, initialCapacity); mv.visitMethodInsn(INVOKEINTERFACE, builderInterfaceInternalName, BuilderConstants.startBuildName(entityDesc), "(I)V"); } public void _wEntity(EntityDescriptor<?> entityDesc) { ensureBuilder(entityDesc.getLanguageKit()); mv.visitVarInsn(ALOAD, varNum); mv.visitMethodInsn(INVOKEINTERFACE, builderInterfaceInternalName, BuilderConstants.endBuildName(entityDesc), "()V"); } public void wEntity(EntityDescriptor<?> entityDesc) { ensureBuilder(entityDesc.getLanguageKit()); mv.visitVarInsn(ALOAD, varNum); mv.visitMethodInsn(INVOKEINTERFACE, builderInterfaceInternalName, BuilderConstants.buildName(entityDesc), "()V"); } public void wEntity(EntityDescriptor<?> entityDesc, boolean value) { ensureBuilder(entityDesc.getLanguageKit()); mv.visitVarInsn(ALOAD, varNum); mv.visitInsn(value ? ICONST_1 : ICONST_0); mv.visitMethodInsn(INVOKEINTERFACE, builderInterfaceInternalName, BuilderConstants.buildName(entityDesc), "(Z)V"); } public void wEntity(EntityDescriptor<?> entityDesc, byte value) { ensureBuilder(entityDesc.getLanguageKit()); wEntity(entityDesc, value); } public void wEntity(EntityDescriptor<?> entityDesc, char value) { ensureBuilder(entityDesc.getLanguageKit()); } public void wEntity(EntityDescriptor<?> entityDesc, double value) { ensureBuilder(entityDesc.getLanguageKit()); } public void wEntity(EntityDescriptor<?> entityDesc, float value) { ensureBuilder(entityDesc.getLanguageKit()); } public void wEntity(EntityDescriptor<?> entityDesc, int value) { ensureBuilder(entityDesc.getLanguageKit()); mv.visitVarInsn(ALOAD, varNum); visitIntInsn(mv, value); mv.visitMethodInsn(INVOKEINTERFACE, builderInterfaceInternalName, BuilderConstants.buildName(entityDesc), "(I)V"); } public void wEntity(EntityDescriptor<?> entityDesc, long value) { ensureBuilder(entityDesc.getLanguageKit()); } public void wEntity(EntityDescriptor<?> entityDesc, short value) { ensureBuilder(entityDesc.getLanguageKit()); } public void wEntity(EntityDescriptor<?> entityDesc, String value) { ensureBuilder(entityDesc.getLanguageKit()); mv.visitVarInsn(ALOAD, varNum); mv.visitLdcInsn(value); mv.visitMethodInsn(INVOKEINTERFACE, builderInterfaceInternalName, BuilderConstants.buildName(entityDesc), "(Ljava/lang/String;)V"); } public void wEntity(EntityDescriptor<?> entityDesc, Date value) { ensureBuilder(entityDesc.getLanguageKit()); } public void wEntity(EntityDescriptor<?> entityDesc, EnumValue value) { ensureBuilder(entityDesc.getLanguageKit()); } public void wEntity(EntityDescriptor<?> entityDesc, Object value) { } public void wSetBuilderContext(IBuilderContext context) { } public void wSetEntityContext(IEntityContext context) { } public void wDefault() { // TODO throw new UnsupportedOperationException(); } public void wEntity() { // TODO throw new UnsupportedOperationException(); } public void wEntity_() { // TODO throw new UnsupportedOperationException(); } public void _wEntity() { // TODO throw new UnsupportedOperationException(); } public void wFeature(int index) { // TODO throw new UnsupportedOperationException(); } public void wFeature(FeatureDescriptor feature) { // TODO throw new UnsupportedOperationException(); } public void wFeature(ITemplate template) { // TODO throw new UnsupportedOperationException(); } }