private void build_boilerplate(ClassWriter cw) {
String classname = "SVDBPersistenceDelegate";
String full_classname = transform_cls(fTargetPkg) + "/" + classname;
cw.visit(
Opcodes.V1_5,
ACC_PROTECTED + ACC_PUBLIC + ACC_SUPER,
full_classname,
null,
fBaseClass,
null);
cw.visitSource(classname + ".java", null);
MethodVisitor mv;
// Constructor
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, fBaseClass, "<init>", "()V");
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
buildItemDispatchMethods(cw);
buildObjectDispatchMethods(cw);
}
public void startScript(StaticScope scope) {
classWriter = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
// Create the class with the appropriate class name and source file
classWriter.visit(
javaVersion == null ? RubyInstanceConfig.JAVA_VERSION : javaVersion,
ACC_PUBLIC + ACC_SUPER,
getClassname(),
null,
p(AbstractScript.class),
null);
// add setPosition impl, which stores filename as constant to speed updates
SkinnyMethodAdapter method =
new SkinnyMethodAdapter(
getClassVisitor(),
ACC_PRIVATE | ACC_STATIC | ACC_SYNTHETIC,
"setPosition",
sig(Void.TYPE, params(ThreadContext.class, int.class)),
null,
null);
method.start();
method.aload(0); // thread context
method.ldc(sourcename);
method.iload(1); // line number
method.invokevirtual(
p(ThreadContext.class), "setFileAndLine", sig(void.class, String.class, int.class));
method.voidreturn();
method.end();
topLevelScope = scope;
beginInit();
cacheCompiler = OptoFactory.newCacheCompiler(this);
// This code was originally used to provide debugging info using JSR-45
// "SMAP" format. However, it breaks using normal Java traces to
// generate Ruby traces, since the original path is lost. Reverting
// to full path for now.
// String sourceNoPath;
// if (sourcename.indexOf("/") >= 0) {
// String[] pathElements = sourcename.split("/");
// sourceNoPath = pathElements[pathElements.length - 1];
// } else if (sourcename.indexOf("\\") >= 0) {
// String[] pathElements = sourcename.split("\\\\");
// sourceNoPath = pathElements[pathElements.length - 1];
// } else {
// sourceNoPath = sourcename;
// }
final File sourceFile = new File(getSourcename());
// Revert to using original sourcename here, so that jitted traces match
// interpreted traces.
classWriter.visitSource(sourcename, sourceFile.getAbsolutePath());
}
public Class<?> createWrapper(Method callback) {
ClassWriter cw = new ClassWriter(0);
MethodVisitor mv;
String name = getUniqueName(callback);
String desc = name.replace('.', '/');
String instType = Type.getInternalName(callback.getDeclaringClass());
String eventType = Type.getInternalName(callback.getParameterTypes()[0]);
/*
System.out.println("Name: " + name);
System.out.println("Desc: " + desc);
System.out.println("InstType: " + instType);
System.out.println("Callback: " + callback.getName() + Type.getMethodDescriptor(callback));
System.out.println("Event: " + eventType);
*/
cw.visit(
V1_6, ACC_PUBLIC | ACC_SUPER, desc, null, "java/lang/Object", new String[] {HANDLER_DESC});
cw.visitSource(".dynamic", null);
{
cw.visitField(ACC_PUBLIC, "instance", "Ljava/lang/Object;", null, null).visitEnd();
}
{
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "(Ljava/lang/Object;)V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitFieldInsn(PUTFIELD, desc, "instance", "Ljava/lang/Object;");
mv.visitInsn(RETURN);
mv.visitMaxs(2, 2);
mv.visitEnd();
}
{
mv = cw.visitMethod(ACC_PUBLIC, "invoke", HANDLER_FUNC_DESC, null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, desc, "instance", "Ljava/lang/Object;");
mv.visitTypeInsn(CHECKCAST, instType);
mv.visitVarInsn(ALOAD, 1);
mv.visitTypeInsn(CHECKCAST, eventType);
mv.visitMethodInsn(
INVOKEVIRTUAL, instType, callback.getName(), Type.getMethodDescriptor(callback));
mv.visitInsn(RETURN);
mv.visitMaxs(2, 2);
mv.visitEnd();
}
cw.visitEnd();
return LOADER.define(name, cw.toByteArray());
}
protected static ClassWriter createClassWriter(String internalName, AccessorType accessorType) {
ClassWriter classWriter =
new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
classWriter.visit(
V1_6,
ACC_PUBLIC + ACC_SUPER,
internalName,
null,
"java/lang/Object",
new String[] {getInternalName(accessorType.getAccessorType().getName())});
classWriter.visitSource(getExternalName(internalName), null);
return classWriter;
}
public static byte[] dump() throws Exception {
ClassWriter cw = new ClassWriter(0);
MethodVisitor mv;
cw.visit(52, ACC_PUBLIC + ACC_SUPER, "DummyBundleClass", null, "java/lang/Object", null);
cw.visitSource("DummyBundleClass.java", null);
{
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
Label l0 = new Label();
mv.visitLabel(l0);
mv.visitLineNumber(1, l0);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
mv.visitInsn(RETURN);
Label l1 = new Label();
mv.visitLabel(l1);
mv.visitLocalVariable("this", "LDummyBundleClass;", null, l0, l1, 0);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
{
mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "main", "([Ljava/lang/String;)V", null, null);
mv.visitCode();
Label l0 = new Label();
mv.visitLabel(l0);
mv.visitLineNumber(4, l0);
mv.visitInsn(RETURN);
Label l1 = new Label();
mv.visitLabel(l1);
mv.visitLocalVariable("args", "[Ljava/lang/String;", null, l0, l1, 0);
mv.visitMaxs(0, 1);
mv.visitEnd();
}
cw.visitEnd();
return cw.toByteArray();
}
private static byte[] compileBytes(
Rule rule,
Class helperClass,
String helperName,
String compiledHelperName,
boolean compileToBytecode)
throws Exception {
ClassWriter cw = new ClassWriter(0);
FieldVisitor fv;
MethodVisitor mv;
AnnotationVisitor av0;
// create the class as a subclass of the rule helper class, appending Compiled to the front
// of the class name and a unique number to the end of the class helperName
// also ensure it implements the HelperAdapter interface
//
// public class foo.bar.Compiled_<helper>_<NNN> extends foo.bar.<helper> implements
// HelperAdapter
cw.visit(
V1_5,
ACC_PUBLIC + ACC_SUPER,
compiledHelperName,
null,
helperName,
new String[] {"org/jboss/byteman/rule/helper/HelperAdapter"});
// we need to install the source file name
{
String fullFileName = rule.getFile();
int idx = fullFileName.lastIndexOf(java.io.File.separatorChar);
String basicFileName = (idx < 0 ? fullFileName : fullFileName.substring(idx + 1));
String debug = "// compiled from: " + fullFileName + "\n// generated by Byteman\n";
cw.visitSource(basicFileName, debug);
}
{
// we need a Hashmap field to hold the bindings
//
// private HashMap<String, Object> bindingMap;
fv =
cw.visitField(
ACC_PRIVATE,
"bindingMap",
"Ljava/util/HashMap;",
"Ljava/util/HashMap<Ljava/lang/String;Ljava/lang/Object;>;",
null);
fv.visitEnd();
}
{
// and a rule field to hold the rule
//
// private Rule rule;
fv =
cw.visitField(
ACC_PRIVATE,
"rule",
"Lorg/jboss/byteman/rule/Rule;",
"Lorg/jboss/byteman/rule/Rule;",
null);
fv.visitEnd();
}
{
// we need a constructor which takes a Rule as argument
// if the helper implements a constructor which takes a Rule as argument then we invoke it
// otherwise we invoke the empty helper constructor
Constructor superConstructor = null;
try {
superConstructor = helperClass.getDeclaredConstructor(Rule.class);
} catch (NoSuchMethodException e) {
// hmm, ok see if there is an empty constructor
} catch (SecurityException e) {
throw new CompileException(
"Compiler.compileBytes : unable to access constructor for helper class "
+ helperClass.getCanonicalName());
}
boolean superWantsRule = (superConstructor != null);
if (!superWantsRule) {
try {
superConstructor = helperClass.getDeclaredConstructor();
} catch (NoSuchMethodException e) {
throw new CompileException(
"Compiler.compileBytes : no valid constructor found for helper class "
+ helperClass.getCanonicalName());
} catch (SecurityException e) {
throw new CompileException(
"Compiler.compileBytes : unable to access constructor for helper class "
+ helperClass.getCanonicalName());
}
}
//
// public Compiled<helper>_<NNN>()Rule rule)
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "(Lorg/jboss/byteman/rule/Rule;)V", null, null);
mv.visitCode();
// super();
//
// or
//
// super(Rule);
if (superWantsRule) {
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKESPECIAL, helperName, "<init>", "(Lorg/jboss/byteman/rule/Rule;)V");
} else {
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, helperName, "<init>", "()V");
}
// bindingMap = new HashMap<String, Object);
mv.visitVarInsn(ALOAD, 0);
mv.visitTypeInsn(NEW, "java/util/HashMap");
mv.visitInsn(DUP);
mv.visitMethodInsn(INVOKESPECIAL, "java/util/HashMap", "<init>", "()V");
mv.visitFieldInsn(PUTFIELD, compiledHelperName, "bindingMap", "Ljava/util/HashMap;");
// this.rule = rule
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitFieldInsn(PUTFIELD, compiledHelperName, "rule", "Lorg/jboss/byteman/rule/Rule;");
// return;
mv.visitInsn(RETURN);
mv.visitMaxs(3, 2);
mv.visitEnd();
}
{
// create the execute method
//
// public void execute(Bindings bindings, Object recipient, Object[] args) throws
// ExecuteException
mv =
cw.visitMethod(
ACC_PUBLIC,
"execute",
"(Ljava/lang/Object;[Ljava/lang/Object;)V",
null,
new String[] {"org/jboss/byteman/rule/exception/ExecuteException"});
mv.visitCode();
// if (Transformer.isVerbose())
mv.visitMethodInsn(INVOKESTATIC, "org/jboss/byteman/agent/Transformer", "isVerbose", "()Z");
Label l0 = new Label();
mv.visitJumpInsn(IFEQ, l0);
// then
// System.out.println(rule.getName() + " execute");
mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
mv.visitInsn(DUP);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "()V");
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, compiledHelperName, "rule", "Lorg/jboss/byteman/rule/Rule;");
mv.visitMethodInsn(
INVOKEVIRTUAL, "org/jboss/byteman/rule/Rule", "getName", "()Ljava/lang/String;");
mv.visitMethodInsn(
INVOKEVIRTUAL,
"java/lang/StringBuilder",
"append",
"(Ljava/lang/String;)Ljava/lang/StringBuilder;");
mv.visitLdcInsn(" execute()");
mv.visitMethodInsn(
INVOKEVIRTUAL,
"java/lang/StringBuilder",
"append",
"(Ljava/lang/String;)Ljava/lang/StringBuilder;");
mv.visitMethodInsn(
INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;");
mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V");
// end if
mv.visitLabel(l0);
Bindings bindings = rule.getBindings();
Iterator<Binding> iterator = bindings.iterator();
while (iterator.hasNext()) {
Binding binding = iterator.next();
String name = binding.getName();
if (binding.isAlias()) {
// lookups and updates will use the aliased name
continue;
}
if (binding.isHelper()) {
// bindingMap.put(name, this);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, compiledHelperName, "bindingMap", "Ljava/util/HashMap;");
mv.visitLdcInsn(name);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(
INVOKEVIRTUAL,
"java/util/HashMap",
"put",
"(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");
mv.visitInsn(POP);
} else if (binding.isRecipient()) {
// bindingMap.put(name, recipient);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, compiledHelperName, "bindingMap", "Ljava/util/HashMap;");
mv.visitLdcInsn(name);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(
INVOKEVIRTUAL,
"java/util/HashMap",
"put",
"(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");
mv.visitInsn(POP);
// } else if (binding.isParam() || binding.isLocalVar() || binding.isReturn() ||
// binding.isThrowable() || binding.isParamCount() || binding.isParamArray())
// {
} else if (!binding.isBindVar()) {
// bindingMap.put(name, args[binding.getCallArrayIndex()]);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, compiledHelperName, "bindingMap", "Ljava/util/HashMap;");
mv.visitLdcInsn(name);
mv.visitVarInsn(ALOAD, 2);
mv.visitLdcInsn(binding.getCallArrayIndex());
mv.visitInsn(AALOAD);
mv.visitMethodInsn(
INVOKEVIRTUAL,
"java/util/HashMap",
"put",
"(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");
mv.visitInsn(POP);
}
}
// execute0()
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKEVIRTUAL, compiledHelperName, "execute0", "()V");
// now restore update bindings
iterator = bindings.iterator();
while (iterator.hasNext()) {
Binding binding = iterator.next();
if (binding.isAlias()) {
continue;
}
String name = binding.getName();
if (binding.isUpdated()) {
// if (binding.isParam() || binding.isLocalVar() || binding.isReturn()) {
if (!binding.isBindVar()) {
int idx = binding.getCallArrayIndex();
// Object value = bindingMap.get(name);
// args[idx] = value;
mv.visitVarInsn(ALOAD, 2); // args
mv.visitLdcInsn(idx);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, compiledHelperName, "bindingMap", "Ljava/util/HashMap;");
mv.visitLdcInsn(name);
mv.visitMethodInsn(
INVOKEVIRTUAL,
"java/util/HashMap",
"get",
"(Ljava/lang/Object;)Ljava/lang/Object;");
mv.visitInsn(AASTORE);
}
}
}
// return
mv.visitInsn(RETURN);
mv.visitMaxs(4, 3);
mv.visitEnd();
}
{
// create the setBinding method
//
// public void setBinding(String name, Object value)
mv =
cw.visitMethod(
ACC_PUBLIC, "setBinding", "(Ljava/lang/String;Ljava/lang/Object;)V", null, null);
mv.visitCode();
// bindingMap.put(name, value);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, compiledHelperName, "bindingMap", "Ljava/util/HashMap;");
mv.visitVarInsn(ALOAD, 1);
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(
INVOKEVIRTUAL,
"java/util/HashMap",
"put",
"(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");
mv.visitInsn(POP);
// return
mv.visitInsn(RETURN);
mv.visitMaxs(3, 3);
mv.visitEnd();
}
{
// create the getBinding method
//
// public Object getBinding(String name)
mv =
cw.visitMethod(
ACC_PUBLIC, "getBinding", "(Ljava/lang/String;)Ljava/lang/Object;", null, null);
mv.visitCode();
// {TOS} <== bindingMap.get(name);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, compiledHelperName, "bindingMap", "Ljava/util/HashMap;");
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(
INVOKEVIRTUAL, "java/util/HashMap", "get", "(Ljava/lang/Object;)Ljava/lang/Object;");
// return {TOS}
mv.visitInsn(ARETURN);
mv.visitMaxs(2, 2);
mv.visitEnd();
}
{
// create the getName method
//
// public String getName()
mv = cw.visitMethod(ACC_PUBLIC, "getName", "()Ljava/lang/String;", null, null);
mv.visitCode();
// {TOS} <== rule.getName()
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, compiledHelperName, "rule", "Lorg/jboss/byteman/rule/Rule;");
mv.visitMethodInsn(
INVOKEVIRTUAL, "org/jboss/byteman/rule/Rule", "getName", "()Ljava/lang/String;");
// return {TOS}
mv.visitInsn(ARETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
// create the getAccessibleField method
//
// public Object getAccessibleField(Object owner, int fieldIndex)
{
mv =
cw.visitMethod(
ACC_PUBLIC,
"getAccessibleField",
"(Ljava/lang/Object;I)Ljava/lang/Object;",
null,
null);
mv.visitCode();
// {TOS} <== rule.getAccessibleField(owner, fieldIndex);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, compiledHelperName, "rule", "Lorg/jboss/byteman/rule/Rule;");
mv.visitVarInsn(ALOAD, 1);
mv.visitVarInsn(ILOAD, 2);
mv.visitMethodInsn(
INVOKEVIRTUAL,
"org/jboss/byteman/rule/Rule",
"getAccessibleField",
"(Ljava/lang/Object;I)Ljava/lang/Object;");
// return {TOS}
mv.visitInsn(ARETURN);
mv.visitMaxs(3, 3);
mv.visitEnd();
}
// create the setAccessibleField method
//
// public void setAccessibleField(Object owner, Object value, int fieldIndex)
// rule.setAccessibleField(owner, value, fieldIndex);
{
mv =
cw.visitMethod(
ACC_PUBLIC,
"setAccessibleField",
"(Ljava/lang/Object;Ljava/lang/Object;I)V",
null,
null);
mv.visitCode();
// rule.setAccessibleField(owner, value, fieldIndex);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, compiledHelperName, "rule", "Lorg/jboss/byteman/rule/Rule;");
mv.visitVarInsn(ALOAD, 1);
mv.visitVarInsn(ALOAD, 2);
mv.visitVarInsn(ILOAD, 3);
mv.visitMethodInsn(
INVOKEVIRTUAL,
"org/jboss/byteman/rule/Rule",
"setAccessibleField",
"(Ljava/lang/Object;Ljava/lang/Object;I)V");
// return
mv.visitInsn(RETURN);
mv.visitMaxs(4, 4);
mv.visitEnd();
}
// create the invokeAccessibleMethod method
//
// public Object invokeAccessibleMethod(Object target, Object[] args, int methodIndex)
// {TOS} <== rule.invokeAccessibleMethod(target, args, methodIndex);
{
mv =
cw.visitMethod(
ACC_PUBLIC,
"invokeAccessibleMethod",
"(Ljava/lang/Object;[Ljava/lang/Object;I)Ljava/lang/Object;",
null,
null);
mv.visitCode();
// rule.invokeAccessibleMethod(target, args, fieldIndex);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, compiledHelperName, "rule", "Lorg/jboss/byteman/rule/Rule;");
mv.visitVarInsn(ALOAD, 1);
mv.visitVarInsn(ALOAD, 2);
mv.visitVarInsn(ILOAD, 3);
mv.visitMethodInsn(
INVOKEVIRTUAL,
"org/jboss/byteman/rule/Rule",
"invokeAccessibleMethod",
"(Ljava/lang/Object;[Ljava/lang/Object;I)Ljava/lang/Object;");
// return {TOS}
mv.visitInsn(ARETURN);
mv.visitMaxs(4, 4);
mv.visitEnd();
}
if (compileToBytecode) {
// we generate a single execute0 method if we want to run compiled and get
// the event, condiiton and action to insert the relevant bytecode to implement
// bind(), test() and fire()
{
// create the execute0() method
//
// private void execute0()
mv =
cw.visitMethod(
ACC_PRIVATE,
"execute0",
"()V",
null,
new String[] {"org/jboss/byteman/rule/exception/ExecuteException"});
mv.visitCode();
CompileContext compileContext = new CompileContext(mv);
// make sure we set the first line number before generating any code
compileContext.notifySourceLine(rule.getLine());
compileContext.addLocalCount(3); // for this and 2 object args
// bind();
rule.getEvent().compile(mv, compileContext);
// if (test())
rule.getCondition().compile(mv, compileContext);
Label l0 = new Label();
mv.visitJumpInsn(IFEQ, l0);
compileContext.addStackCount(-1);
// then
rule.getAction().compile(mv, compileContext);
// fire();
// end if
mv.visitLabel(l0);
// this will match the ENDRULE line
compileContext.notifySourceEnd();
// return
mv.visitInsn(RETURN);
// need to specify correct Maxs values
mv.visitMaxs(compileContext.getStackMax(), compileContext.getLocalMax());
mv.visitEnd();
}
} else {
// we generate the following methods if we want to run interpreted
{
// create the execute0() method
//
// private void execute0()
mv =
cw.visitMethod(
ACC_PRIVATE,
"execute0",
"()V",
null,
new String[] {"org/jboss/byteman/rule/exception/ExecuteException"});
mv.visitCode();
// bind();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, compiledHelperName, "bind", "()V");
// if (test())
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, compiledHelperName, "test", "()Z");
Label l0 = new Label();
mv.visitJumpInsn(IFEQ, l0);
// then
// fire();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, compiledHelperName, "fire", "()V");
// end if
mv.visitLabel(l0);
// return
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
{
// create the bind method
//
// private void bind()
mv =
cw.visitMethod(
ACC_PRIVATE,
"bind",
"()V",
null,
new String[] {"org/jboss/byteman/rule/exception/ExecuteException"});
mv.visitCode();
// rule.getEvent().interpret(this);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, compiledHelperName, "rule", "Lorg/jboss/byteman/rule/Rule;");
mv.visitMethodInsn(
INVOKEVIRTUAL,
"org/jboss/byteman/rule/Rule",
"getEvent",
"()Lorg/jboss/byteman/rule/Event;");
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(
INVOKEVIRTUAL,
"org/jboss/byteman/rule/Event",
"interpret",
"(Lorg/jboss/byteman/rule/helper/HelperAdapter;)Ljava/lang/Object;");
mv.visitInsn(RETURN);
mv.visitMaxs(2, 1);
mv.visitEnd();
}
{
// create the test method
//
// private boolean test()
mv =
cw.visitMethod(
ACC_PRIVATE,
"test",
"()Z",
null,
new String[] {"org/jboss/byteman/rule/exception/ExecuteException"});
mv.visitCode();
// {TOS} <== rule.getCondition().interpret(this);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, compiledHelperName, "rule", "Lorg/jboss/byteman/rule/Rule;");
mv.visitMethodInsn(
INVOKEVIRTUAL,
"org/jboss/byteman/rule/Rule",
"getCondition",
"()Lorg/jboss/byteman/rule/Condition;");
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(
INVOKEVIRTUAL,
"org/jboss/byteman/rule/Condition",
"interpret",
"(Lorg/jboss/byteman/rule/helper/HelperAdapter;)Ljava/lang/Object;");
mv.visitTypeInsn(Opcodes.CHECKCAST, "java/lang/Boolean");
// unbox the returned Boolean
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Boolean", "booleanValue", "()Z");
// return {TOS}
mv.visitInsn(IRETURN);
mv.visitMaxs(2, 1);
mv.visitEnd();
}
{
// create the fire method
//
// private void fire()
mv =
cw.visitMethod(
ACC_PRIVATE,
"fire",
"()V",
null,
new String[] {"org/jboss/byteman/rule/exception/ExecuteException"});
mv.visitCode();
// rule.getAction().interpret(this);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, compiledHelperName, "rule", "Lorg/jboss/byteman/rule/Rule;");
mv.visitMethodInsn(
INVOKEVIRTUAL,
"org/jboss/byteman/rule/Rule",
"getAction",
"()Lorg/jboss/byteman/rule/Action;");
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(
INVOKEVIRTUAL,
"org/jboss/byteman/rule/Action",
"interpret",
"(Lorg/jboss/byteman/rule/helper/HelperAdapter;)Ljava/lang/Object;");
// return
mv.visitInsn(RETURN);
mv.visitMaxs(2, 1);
mv.visitEnd();
}
}
cw.visitEnd();
return cw.toByteArray();
}
@Override
public Object visitProgram(Program program, Object arg) throws Exception {
className = program.JVMName;
classDescriptor = 'L' + className + ';';
cw.visit(
52, // version
ACC_PUBLIC + ACC_SUPER, // access codes
className, // fully qualified classname
null, // signature
"java/lang/Object", // superclass
new String[] {"cop5555sp15/Codelet"} // implemented interfaces
);
cw.visitSource(null, null); // maybe replace first argument with source
// file name
// create init method
{
MethodVisitor mv;
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
Label l0 = new Label();
mv.visitLabel(l0);
mv.visitLineNumber(3, l0);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
mv.visitInsn(RETURN);
Label l1 = new Label();
mv.visitLabel(l1);
mv.visitLocalVariable("this", classDescriptor, null, l0, l1, 0);
mv.visitMaxs(1, 1);
mv.visitEnd();
}
// generate the execute method
MethodVisitor mv =
cw.visitMethod(
ACC_PUBLIC,
"execute", // name of top
// level
// method
"()V", // descriptor: this method is parameterless with no
// return value
null, // signature. This is null for us, it has to do with generic types
null // array of strings containing exceptions
);
mv.visitCode();
Label lbeg = new Label();
mv.visitLabel(lbeg);
mv.visitLineNumber(program.firstToken.lineNumber, lbeg);
program.block.visit(this, new InheritedAttributes(mv));
mv.visitInsn(RETURN);
Label lend = new Label();
mv.visitLabel(lend);
mv.visitLocalVariable("this", classDescriptor, null, lbeg, lend, 0);
mv.visitMaxs(0, 0); // this is required just before the end of a method.
// It causes asm to calculate information about the
// stack usage of this method.
mv.visitEnd();
cw.visitEnd();
return cw.toByteArray();
}
