org.springframework.asm.Label Java Examples

private void generateGet(Class type, final Map<String, PropertyDescriptor> getters) {
	final CodeEmitter e = begin_method(Constants.ACC_PUBLIC, BEAN_MAP_GET, null);
	e.load_arg(0);
	e.checkcast(Type.getType(type));
	e.load_arg(1);
	e.checkcast(Constants.TYPE_STRING);
	EmitUtils.string_switch(e, getNames(getters), Constants.SWITCH_STYLE_HASH, new ObjectSwitchCallback() {
		@Override
		public void processCase(Object key, Label end) {
			PropertyDescriptor pd = getters.get(key);
			MethodInfo method = ReflectUtils.getMethodInfo(pd.getReadMethod());
			e.invoke(method);
			e.box(method.getSignature().getReturnType());
			e.return_value();
		}

		@Override
		public void processDefault() {
			e.aconst_null();
			e.return_value();
		}
	});
	e.end_method();
}
 

private void generateGetPropertyType(final Map allProps, String[] allNames) {
	final CodeEmitter e = begin_method(Constants.ACC_PUBLIC, GET_PROPERTY_TYPE, null);
	e.load_arg(0);
	EmitUtils.string_switch(e, allNames, Constants.SWITCH_STYLE_HASH, new ObjectSwitchCallback() {
		@Override
		public void processCase(Object key, Label end) {
			PropertyDescriptor pd = (PropertyDescriptor) allProps.get(key);
			EmitUtils.load_class(e, Type.getType(pd.getPropertyType()));
			e.return_value();
		}

		@Override
		public void processDefault() {
			e.aconst_null();
			e.return_value();
		}
	});
	e.end_method();
}
 

private void emitGetCallback(ClassEmitter ce, int[] keys) {
	final CodeEmitter e = ce.begin_method(Constants.ACC_PUBLIC, GET_CALLBACK, null);
	e.load_this();
	e.invoke_static_this(BIND_CALLBACKS);
	e.load_this();
	e.load_arg(0);
	e.process_switch(keys, new ProcessSwitchCallback() {
		public void processCase(int key, Label end) {
			e.getfield(getCallbackField(key));
			e.goTo(end);
		}

		public void processDefault() {
			e.pop(); // stack height
			e.aconst_null();
		}
	});
	e.return_value();
	e.end_method();
}
 

private void emitSetCallback(ClassEmitter ce, int[] keys) {
	final CodeEmitter e = ce.begin_method(Constants.ACC_PUBLIC, SET_CALLBACK, null);
	e.load_arg(0);
	e.process_switch(keys, new ProcessSwitchCallback() {
		public void processCase(int key, Label end) {
			e.load_this();
			e.load_arg(1);
			e.checkcast(callbackTypes[key]);
			e.putfield(getCallbackField(key));
			e.goTo(end);
		}

		public void processDefault() {
			// TODO: error?
		}
	});
	e.return_value();
	e.end_method();
}
 

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// Pseudo: if (!leftOperandValue) { result=false; } else { result=rightOperandValue; }
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitJumpInsn(IFNE, elseTarget);
	mv.visitLdcInsn(0); // FALSE
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// pseudo: if (leftOperandValue) { result=true; } else { result=rightOperandValue; }
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitJumpInsn(IFEQ, elseTarget);
	mv.visitLdcInsn(1); // TRUE
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

private void emitGetCallback(ClassEmitter ce, int[] keys) {
	final CodeEmitter e = ce.begin_method(Constants.ACC_PUBLIC, GET_CALLBACK, null);
	e.load_this();
	e.invoke_static_this(BIND_CALLBACKS);
	e.load_this();
	e.load_arg(0);
	e.process_switch(keys, new ProcessSwitchCallback() {
		public void processCase(int key, Label end) {
			e.getfield(getCallbackField(key));
			e.goTo(end);
		}

		public void processDefault() {
			e.pop(); // stack height
			e.aconst_null();
		}
	});
	e.return_value();
	e.end_method();
}
 

private void emitSetCallback(ClassEmitter ce, int[] keys) {
	final CodeEmitter e = ce.begin_method(Constants.ACC_PUBLIC, SET_CALLBACK, null);
	e.load_arg(0);
	e.process_switch(keys, new ProcessSwitchCallback() {
		public void processCase(int key, Label end) {
			e.load_this();
			e.load_arg(1);
			e.checkcast(callbackTypes[key]);
			e.putfield(getCallbackField(key));
			e.goTo(end);
		}

		public void processDefault() {
			// TODO: error?
		}
	});
	e.return_value();
	e.end_method();
}
 

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// Pseudo: if (!leftOperandValue) { result=false; } else { result=rightOperandValue; }
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitJumpInsn(IFNE, elseTarget);
	mv.visitLdcInsn(0); // FALSE
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// pseudo: if (leftOperandValue) { result=true; } else { result=rightOperandValue; }
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitJumpInsn(IFEQ, elseTarget);
	mv.visitLdcInsn(1); // TRUE
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// Pseudo: if (!leftOperandValue) { result=false; } else { result=rightOperandValue; }
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitJumpInsn(IFNE, elseTarget);
	mv.visitLdcInsn(0); // FALSE
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// pseudo: if (leftOperandValue) { result=true; } else { result=rightOperandValue; }
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitJumpInsn(IFEQ, elseTarget);
	mv.visitLdcInsn(1); // TRUE
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// exit type descriptor can be null if both components are literal expressions
	computeExitTypeDescriptor();
	this.children[0].generateCode(mv, cf);
	CodeFlow.insertBoxIfNecessary(mv, cf.lastDescriptor().charAt(0));
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	mv.visitInsn(DUP);
	mv.visitJumpInsn(IFNULL, elseTarget);
	// Also check if empty string, as per the code in the interpreted version
	mv.visitInsn(DUP);
	mv.visitLdcInsn("");
	mv.visitInsn(SWAP);
	mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z",false);
	mv.visitJumpInsn(IFEQ, endOfIf);  // if not empty, drop through to elseTarget
	mv.visitLabel(elseTarget);
	mv.visitInsn(POP);
	this.children[1].generateCode(mv, cf);
	if (!CodeFlow.isPrimitive(this.exitTypeDescriptor)) {
		CodeFlow.insertBoxIfNecessary(mv, cf.lastDescriptor().charAt(0));
	}
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// Pseudo: if (!leftOperandValue) { result=false; } else { result=rightOperandValue; }
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitJumpInsn(IFNE, elseTarget);
	mv.visitLdcInsn(0); // FALSE
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// pseudo: if (leftOperandValue) { result=true; } else { result=rightOperandValue; }
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitJumpInsn(IFEQ, elseTarget);
	mv.visitLdcInsn(1); // TRUE
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// exit type descriptor can be null if both components are literal expressions
	computeExitTypeDescriptor();
	this.children[0].generateCode(mv, cf);
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	mv.visitInsn(DUP);
	mv.visitJumpInsn(IFNULL, elseTarget);
	mv.visitJumpInsn(GOTO, endOfIf);
	mv.visitLabel(elseTarget);
	mv.visitInsn(POP);
	this.children[1].generateCode(mv, cf);
	if (!CodeFlow.isPrimitive(this.exitTypeDescriptor)) {
		CodeFlow.insertBoxIfNecessary(mv, cf.lastDescriptor().charAt(0));
	}
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

private void generatePut(Class type, final Map<String, PropertyDescriptor> setters) {
	final CodeEmitter e = begin_method(Constants.ACC_PUBLIC, BEAN_MAP_PUT, null);
	e.load_arg(0);
	e.checkcast(Type.getType(type));
	e.load_arg(1);
	e.checkcast(Constants.TYPE_STRING);
	EmitUtils.string_switch(e, getNames(setters), Constants.SWITCH_STYLE_HASH, new ObjectSwitchCallback() {
		@Override
		public void processCase(Object key, Label end) {
			PropertyDescriptor pd = setters.get(key);
			if (pd.getReadMethod() == null) {
				e.aconst_null();
			} else {
				MethodInfo read = ReflectUtils.getMethodInfo(pd.getReadMethod());
				e.dup();
				e.invoke(read);
				e.box(read.getSignature().getReturnType());
			}
			// move old value behind bean
			e.swap();
			// new value
			e.load_arg(2);
			MethodInfo write = ReflectUtils.getMethodInfo(pd.getWriteMethod());
			e.unbox(write.getSignature().getArgumentTypes()[0]);
			e.invoke(write);
			e.return_value();
		}

		@Override
		public void processDefault() {
			// fall-through
		}
	});
	e.aconst_null();
	e.return_value();
	e.end_method();
}
 

private static void invokeWrite(CodeEmitter e, MethodInfo write, Method writeMethod, boolean nonNull, Label l0) {
	// 返回值，判断 链式 bean
	Class<?> returnType = writeMethod.getReturnType();
	e.invoke(write);
	// 链式 bean，有返回值需要 pop
	if (!returnType.equals(Void.TYPE)) {
		e.pop();
	}
	if (nonNull) {
		e.visitLabel(l0);
	}
}
 

private void emitNewInstanceMultiarg(ClassEmitter ce, List constructors) {
	final CodeEmitter e = ce.begin_method(Constants.ACC_PUBLIC, MULTIARG_NEW_INSTANCE, null);
	final Type thisType = getThisType(e);
	e.load_arg(2);
	e.invoke_static(thisType, SET_THREAD_CALLBACKS);
	e.new_instance(thisType);
	e.dup();
	e.load_arg(0);
	EmitUtils.constructor_switch(e, constructors, new ObjectSwitchCallback() {
		public void processCase(Object key, Label end) {
			MethodInfo constructor = (MethodInfo) key;
			Type types[] = constructor.getSignature().getArgumentTypes();
			for (int i = 0; i < types.length; i++) {
				e.load_arg(1);
				e.push(i);
				e.aaload();
				e.unbox(types[i]);
			}
			e.invoke_constructor(thisType, constructor.getSignature());
			e.goTo(end);
		}

		public void processDefault() {
			e.throw_exception(ILLEGAL_ARGUMENT_EXCEPTION, "Constructor not found");
		}
	});
	e.aconst_null();
	e.invoke_static(thisType, SET_THREAD_CALLBACKS);
	e.return_value();
	e.end_method();
}
 

private void emitCurrentCallback(CodeEmitter e, int index) {
	e.load_this();
	e.getfield(getCallbackField(index));
	e.dup();
	Label end = e.make_label();
	e.ifnonnull(end);
	e.pop(); // stack height
	e.load_this();
	e.invoke_static_this(BIND_CALLBACKS);
	e.load_this();
	e.getfield(getCallbackField(index));
	e.mark(end);
}
 

@Override
public void visitLocalVariable(String name, String description, String signature, Label start, Label end, int index) {
	this.hasLvtInfo = true;
	for (int i = 0; i < this.lvtSlotIndex.length; i++) {
		if (this.lvtSlotIndex[i] == index) {
			this.parameterNames[i] = name;
		}
	}
}
 

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// May reach here without it computed if all elements are literals
	computeExitTypeDescriptor();
	cf.enterCompilationScope();
	this.children[0].generateCode(mv, cf);
	String lastDesc = cf.lastDescriptor();
	Assert.state(lastDesc != null, "No last descriptor");
	if (!CodeFlow.isPrimitive(lastDesc)) {
		CodeFlow.insertUnboxInsns(mv, 'Z', lastDesc);
	}
	cf.exitCompilationScope();
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	mv.visitJumpInsn(IFEQ, elseTarget);
	cf.enterCompilationScope();
	this.children[1].generateCode(mv, cf);
	if (!CodeFlow.isPrimitive(this.exitTypeDescriptor)) {
		lastDesc = cf.lastDescriptor();
		Assert.state(lastDesc != null, "No last descriptor");
		CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
	}
	cf.exitCompilationScope();
	mv.visitJumpInsn(GOTO, endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	this.children[2].generateCode(mv, cf);
	if (!CodeFlow.isPrimitive(this.exitTypeDescriptor)) {
		lastDesc = cf.lastDescriptor();
		Assert.state(lastDesc != null, "No last descriptor");
		CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
	}
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	this.children[0].generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	mv.visitJumpInsn(IFNE,elseTarget);
	mv.visitInsn(ICONST_1); // TRUE
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	mv.visitInsn(ICONST_0); // FALSE
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	cf.loadEvaluationContext(mv);
	String leftDesc = getLeftOperand().exitTypeDescriptor;
	String rightDesc = getRightOperand().exitTypeDescriptor;
	boolean leftPrim = CodeFlow.isPrimitive(leftDesc);
	boolean rightPrim = CodeFlow.isPrimitive(rightDesc);

	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.exitCompilationScope();
	if (leftPrim) {
		CodeFlow.insertBoxIfNecessary(mv, leftDesc.charAt(0));
	}
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.exitCompilationScope();
	if (rightPrim) {
		CodeFlow.insertBoxIfNecessary(mv, rightDesc.charAt(0));
	}

	String operatorClassName = Operator.class.getName().replace('.', '/');
	String evaluationContextClassName = EvaluationContext.class.getName().replace('.', '/');
	mv.visitMethodInsn(INVOKESTATIC, operatorClassName, "equalityCheck",
			"(L" + evaluationContextClassName + ";Ljava/lang/Object;Ljava/lang/Object;)Z", false);

	// Invert the boolean
	Label notZero = new Label();
	Label end = new Label();
	mv.visitJumpInsn(IFNE, notZero);
	mv.visitInsn(ICONST_1);
	mv.visitJumpInsn(GOTO, end);
	mv.visitLabel(notZero);
	mv.visitInsn(ICONST_0);
	mv.visitLabel(end);

	cf.pushDescriptor("Z");
}
 

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// exit type descriptor can be null if both components are literal expressions
	computeExitTypeDescriptor();
	cf.enterCompilationScope();
	this.children[0].generateCode(mv, cf);
	String lastDesc = cf.lastDescriptor();
	Assert.state(lastDesc != null, "No last descriptor");
	CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
	cf.exitCompilationScope();
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	mv.visitInsn(DUP);
	mv.visitJumpInsn(IFNULL, elseTarget);
	// Also check if empty string, as per the code in the interpreted version
	mv.visitInsn(DUP);
	mv.visitLdcInsn("");
	mv.visitInsn(SWAP);
	mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z",false);
	mv.visitJumpInsn(IFEQ, endOfIf);  // if not empty, drop through to elseTarget
	mv.visitLabel(elseTarget);
	mv.visitInsn(POP);
	cf.enterCompilationScope();
	this.children[1].generateCode(mv, cf);
	if (!CodeFlow.isPrimitive(this.exitTypeDescriptor)) {
		lastDesc = cf.lastDescriptor();
		Assert.state(lastDesc != null, "No last descriptor");
		CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
	}
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

private void emitNewInstanceMultiarg(ClassEmitter ce, List constructors) {
	final CodeEmitter e = ce.begin_method(Constants.ACC_PUBLIC, MULTIARG_NEW_INSTANCE, null);
	final Type thisType = getThisType(e);
	e.load_arg(2);
	e.invoke_static(thisType, SET_THREAD_CALLBACKS);
	e.new_instance(thisType);
	e.dup();
	e.load_arg(0);
	EmitUtils.constructor_switch(e, constructors, new ObjectSwitchCallback() {
		public void processCase(Object key, Label end) {
			MethodInfo constructor = (MethodInfo) key;
			Type types[] = constructor.getSignature().getArgumentTypes();
			for (int i = 0; i < types.length; i++) {
				e.load_arg(1);
				e.push(i);
				e.aaload();
				e.unbox(types[i]);
			}
			e.invoke_constructor(thisType, constructor.getSignature());
			e.goTo(end);
		}

		public void processDefault() {
			e.throw_exception(ILLEGAL_ARGUMENT_EXCEPTION, "Constructor not found");
		}
	});
	e.aconst_null();
	e.invoke_static(thisType, SET_THREAD_CALLBACKS);
	e.return_value();
	e.end_method();
}
 

private void emitCurrentCallback(CodeEmitter e, int index) {
	e.load_this();
	e.getfield(getCallbackField(index));
	e.dup();
	Label end = e.make_label();
	e.ifnonnull(end);
	e.pop(); // stack height
	e.load_this();
	e.invoke_static_this(BIND_CALLBACKS);
	e.load_this();
	e.getfield(getCallbackField(index));
	e.mark(end);
}
 

@Override
public void visitLocalVariable(String name, String description, String signature, Label start, Label end, int index) {
	this.hasLvtInfo = true;
	for (int i = 0; i < this.lvtSlotIndex.length; i++) {
		if (this.lvtSlotIndex[i] == index) {
			this.parameterNames[i] = name;
		}
	}
}
 

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// May reach here without it computed if all elements are literals
	computeExitTypeDescriptor();
	cf.enterCompilationScope();
	this.children[0].generateCode(mv, cf);
	String lastDesc = cf.lastDescriptor();
	Assert.state(lastDesc != null, "No last descriptor");
	if (!CodeFlow.isPrimitive(lastDesc)) {
		CodeFlow.insertUnboxInsns(mv, 'Z', lastDesc);
	}
	cf.exitCompilationScope();
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	mv.visitJumpInsn(IFEQ, elseTarget);
	cf.enterCompilationScope();
	this.children[1].generateCode(mv, cf);
	if (!CodeFlow.isPrimitive(this.exitTypeDescriptor)) {
		lastDesc = cf.lastDescriptor();
		Assert.state(lastDesc != null, "No last descriptor");
		CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
	}
	cf.exitCompilationScope();
	mv.visitJumpInsn(GOTO, endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	this.children[2].generateCode(mv, cf);
	if (!CodeFlow.isPrimitive(this.exitTypeDescriptor)) {
		lastDesc = cf.lastDescriptor();
		Assert.state(lastDesc != null, "No last descriptor");
		CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
	}
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	this.children[0].generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	mv.visitJumpInsn(IFNE,elseTarget);
	mv.visitInsn(ICONST_1); // TRUE
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	mv.visitInsn(ICONST_0); // FALSE
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}