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package org.python.modules.jffi;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import java.io.PrintWriter;
import java.lang.reflect.Constructor;
import java.util.concurrent.atomic.AtomicLong;
import static org.python.modules.jffi.CodegenUtils.*;
import static org.objectweb.asm.Opcodes.*;
/**
*
*/
final class AsmClassBuilder {
public static final boolean DEBUG = false || Boolean.getBoolean("jython.ctypes.compile.dump");
private static final AtomicLong nextClassID = new AtomicLong(0);
private final JITSignature signature;
private final ClassWriter classWriter;
private final ClassVisitor classVisitor;
private final String className;
private final Class parentClass;
private final JITMethodGenerator generator;
AsmClassBuilder(JITMethodGenerator generator, JITSignature signature) {
this.generator = generator;
this.signature = signature;
switch (signature.getParameterCount()) {
case 0:
parentClass = JITInvoker0.class;
break;
case 1:
parentClass = JITInvoker1.class;
break;
case 2:
parentClass = JITInvoker2.class;
break;
case 3:
parentClass = JITInvoker3.class;
break;
case 4:
parentClass = JITInvoker4.class;
break;
case 5:
parentClass = JITInvoker5.class;
break;
case 6:
parentClass = JITInvoker6.class;
break;
default:
throw new UnsupportedOperationException("arity "
+ signature.getParameterCount() + " not supported");
}
className = p(Invoker.class) + "$ffi$" + nextClassID.getAndIncrement();
classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
classVisitor = DEBUG ? newCheckClassAdapter(classWriter) : classWriter;
classVisitor.visit(V1_5, ACC_PUBLIC | ACC_FINAL, className, null,
p(parentClass), new String[0]);
}
Class<? extends Invoker> build() {
// Create the constructor to set the 'library' & functions fields
SkinnyMethodAdapter init = new SkinnyMethodAdapter(classVisitor, ACC_PUBLIC, "<init>",
sig(void.class, com.kenai.jffi.Function.class, NativeDataConverter.class,
NativeDataConverter[].class, Invoker.class),
null, null);
init.start();
// Invokes the super class constructor as super(Library)
init.aload(0);
init.aload(1); // jffi Function
init.aload(4); // fallback Invoker
init.invokespecial(p(parentClass), "<init>", sig(void.class, com.kenai.jffi.Function.class, Invoker.class));
if (signature.hasResultConverter()) {
// Save the result converter argument in a field
classVisitor.visitField(ACC_PRIVATE | ACC_FINAL, getResultConverterFieldName(),
ci(NativeDataConverter.class), null, null);
init.aload(0);
init.aload(2);
init.putfield(className, getResultConverterFieldName(), ci(NativeDataConverter.class));
}
// Now load & store the parameter converter array
for (int i = 0; i < signature.getParameterCount(); i++) {
if (signature.hasParameterConverter(i)) {
classVisitor.visitField(ACC_PRIVATE | ACC_FINAL, getParameterConverterFieldName(i),
ci(NativeDataConverter.class), null, null);
init.aload(0);
init.aload(3);
init.pushInt(i);
init.aaload();
init.putfield(className, getParameterConverterFieldName(i), ci(NativeDataConverter.class));
}
}
init.voidreturn();
init.visitMaxs(10, 10);
init.visitEnd();
generator.generate(this, "invoke", signature);
classVisitor.visitEnd();
try {
byte[] bytes = classWriter.toByteArray();
if (DEBUG) {
ClassVisitor trace = newTraceClassVisitor(new PrintWriter(System.err));
new ClassReader(bytes).accept(trace, 0);
}
JITClassLoader loader = new JITClassLoader(getClass().getClassLoader());
return loader.defineClass(c(className), bytes);
} catch (Throwable ex) {
throw new RuntimeException(ex);
}
}
public static ClassVisitor newCheckClassAdapter(ClassVisitor cv) {
try {
Class<? extends ClassVisitor> tmvClass = Class.forName("org.objectweb.asm.util.CheckClassAdapter").asSubclass(ClassVisitor.class);
Constructor<? extends ClassVisitor> c = tmvClass.getDeclaredConstructor(ClassVisitor.class);
return c.newInstance(cv);
} catch (Throwable t) {
return cv;
}
}
public static final ClassVisitor newTraceClassVisitor(PrintWriter out) {
try {
Class<? extends ClassVisitor> tmvClass = Class.forName("org.objectweb.asm.util.TraceClassVisitor").asSubclass(ClassVisitor.class);
Constructor<? extends ClassVisitor> c = tmvClass.getDeclaredConstructor(PrintWriter.class);
return c.newInstance(out);
} catch (Throwable t) {
return null;
}
}
final String getFunctionFieldName() {
return "jffiFunction";
}
final String getResultConverterFieldName() {
return "resultConverter";
}
final String getParameterConverterFieldName(int i) {
return "parameterConverter" + i;
}
final String getFallbackInvokerFieldName() {
return "fallbackInvoker";
}
final ClassVisitor getClassVisitor() {
return classVisitor;
}
final String getClassName() {
return className;
}
static final class JITClassLoader extends ClassLoader {
public JITClassLoader() {
}
public JITClassLoader(ClassLoader parent) {
super(parent);
}
public Class defineClass(String name, byte[] b) {
Class klass = defineClass(name, b, 0, b.length);
resolveClass(klass);
return klass;
}
}
}