private void build() {
ClassWriter cw = new ClassWriter(0);
final ClassLoader cl = getClass().getClassLoader();
for (SVDBItemType t : SVDBItemType.values()) {
Class cls = null;
for (String pkg : fTargetPkgList) {
try {
cls = cl.loadClass(pkg + ".SVDB" + t.name());
} catch (Exception e) {
}
if (cls != null) {
break;
}
}
if (cls != null) {
// Found a class to process
fTypeClassMap.put(t, cls);
} else {
System.out.println("Error: Failed to find item " + t.name());
}
}
// long start = System.currentTimeMillis();
build_boilerplate(cw);
for (SVDBItemType t : fTypeClassMap.keySet()) {
Class cls = fTypeClassMap.get(t);
buildItemAccessor(cw, t, cls);
}
for (Class c : fClassList) {
buildObjectAccessor(cw, c);
}
cw.visitEnd();
JITClassLoader jit_cl = new JITClassLoader(cl, cw.toByteArray());
try {
fDelegateCls =
(Class<JITPersistenceDelegateBase>)
jit_cl.loadClass(fTargetPkg + ".SVDBPersistenceDelegate");
} catch (Exception e) {
e.printStackTrace();
}
/*
long end = System.currentTimeMillis();
System.out.println("Class-build time: " + (end-start));
System.out.println("Size: " + cw.toByteArray().length);
*/
}
private void buildItemAccessor(ClassWriter cw, SVDBItemType t, Class cls) {
MethodVisitor mv;
if (fDebugEn) {
debug("--> buildAccessor t=" + t.name() + " cls=" + cls.getName());
}
// Constructor
String item_name = t.name();
String tgt_clsname = getClassName(cls);
// Read method
//
// 0 - this
// 1 - parent
// 2 - object
mv =
cw.visitMethod(
ACC_PRIVATE,
"read" + item_name,
"(L" + fChildItem + ";)L" + tgt_clsname + ";",
null,
new String[] {fDBFormatException});
mv.visitCode();
mv.visitTypeInsn(NEW, tgt_clsname); // Create a new class instance
mv.visitInsn(DUP); // Duplicate handle. One will be consumed by the init call
mv.visitMethodInsn(INVOKESPECIAL, tgt_clsname, "<init>", "()V");
// mv.visitInsn(DUP); // Duplicate. One will be consumed by store to obj-var
mv.visitVarInsn(ASTORE, READ_OBJ_VAR); // Store handle to obj-var
// mv.visitVarInsn(ALOAD, THIS_VAR);
// mv.visitVarInsn(ALOAD, READ_OBJ_VAR);
// mv.visitMethodInsn(INVOKESPECIAL, tgt_clsname, "<init>", "()V");
// mv.visit
// mv.visitInsn(ACONST_NULL);
// mv.visitVarInsn(ASTORE, READ_OBJ_VAR); // Initialize return
visit(false, tgt_clsname, mv, cls);
mv.visitVarInsn(ALOAD, READ_OBJ_VAR); // Setup for return of var0
mv.visitInsn(ARETURN);
mv.visitMaxs(3, 3);
mv.visitEnd();
// Write method
//
// 0 - this
// 1 - object
mv =
cw.visitMethod(
ACC_PRIVATE,
"write" + item_name,
// "(L" + tgt_clsname + ";)V",
"(L" + tgt_clsname + ";)V",
null,
new String[] {fDBWriteException});
mv.visitCode();
visit(true, tgt_clsname, mv, cls);
mv.visitInsn(RETURN);
mv.visitMaxs(3, 3);
mv.visitEnd();
if (fDebugEn) {
debug("<-- buildAccessor t=" + t + " cls=" + cls.getName());
}
}
private void buildItemDispatchMethods(ClassWriter cw) {
String classname = "SVDBPersistenceDelegate";
String full_classname = transform_cls(fTargetPkg) + "/" + classname;
Label labels[] = new Label[SVDBItemType.values().length];
int indexes[] = new int[SVDBItemType.values().length];
Label dflt, endcase;
for (int i = 0; i < SVDBItemType.values().length; i++) {
indexes[i] = i;
}
// writeItem Dispatch method
MethodVisitor mv =
cw.visitMethod(
ACC_PUBLIC,
"writeSVDBItem",
"(L" + getClassName(ISVDBItemBase.class) + ";)V",
null,
new String[] {fDBWriteException});
for (int i = 0; i < SVDBItemType.values().length; i++) {
labels[i] = new Label();
}
dflt = new Label();
endcase = new Label();
// Retrieve the object type
mv.visitVarInsn(ALOAD, WRITE_OBJ_VAR);
mv.visitMethodInsn(
INVOKEINTERFACE,
getClassName(ISVDBItemBase.class),
"getType",
"()L" + getClassName(SVDBItemType.class) + ";");
mv.visitMethodInsn(INVOKEVIRTUAL, getClassName(SVDBItemType.class), "ordinal", "()I");
mv.visitLookupSwitchInsn(dflt, indexes, labels);
for (SVDBItemType t : SVDBItemType.values()) {
Class c = fTypeClassMap.get(t);
mv.visitLabel(labels[t.ordinal()]);
mv.visitVarInsn(ALOAD, THIS_VAR);
mv.visitVarInsn(ALOAD, WRITE_OBJ_VAR);
mv.visitTypeInsn(CHECKCAST, getClassName(c));
mv.visitMethodInsn(
INVOKESPECIAL, full_classname, "write" + t.name(), "(L" + getClassName(c) + ";)V");
mv.visitJumpInsn(GOTO, endcase);
}
mv.visitLabel(dflt);
mv.visitLabel(endcase);
mv.visitInsn(RETURN);
mv.visitMaxs(16, 16);
mv.visitEnd();
// readItem dispatch method
mv =
cw.visitMethod(
ACC_PUBLIC,
"readSVDBItem",
"(L"
+ getClassName(SVDBItemType.class)
+ ";L"
+ getClassName(ISVDBChildItem.class)
+ ";)L"
+ getClassName(ISVDBItemBase.class)
+ ";",
null,
new String[] {fDBWriteException});
for (int i = 0; i < SVDBItemType.values().length; i++) {
labels[i] = new Label();
}
dflt = new Label();
endcase = new Label();
mv.visitVarInsn(ALOAD, 1); // object type
mv.visitMethodInsn(INVOKEVIRTUAL, getClassName(SVDBItemType.class), "ordinal", "()I");
mv.visitLookupSwitchInsn(dflt, indexes, labels);
for (SVDBItemType t : SVDBItemType.values()) {
Class c = fTypeClassMap.get(t);
mv.visitLabel(labels[t.ordinal()]);
mv.visitVarInsn(ALOAD, THIS_VAR);
mv.visitVarInsn(ALOAD, 2); // parent
mv.visitMethodInsn(
INVOKESPECIAL,
full_classname,
"read" + t.name(),
"(L" + getClassName(ISVDBChildItem.class) + ";)" + "L" + getClassName(c) + ";");
mv.visitJumpInsn(GOTO, endcase);
}
mv.visitLabel(dflt);
mv.visitInsn(ACONST_NULL);
mv.visitLabel(endcase);
mv.visitInsn(ARETURN);
mv.visitMaxs(16, 16);
mv.visitEnd();
}
