Java Code Examples for org.apache.bcel.generic.Type#VOID
The following examples show how to use
org.apache.bcel.generic.Type#VOID .
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Example 1
| Source File: TestArrayAccess03Creator.java From commons-bcel with Apache License 2.0 | 6 votes |
|
private void createMethod_1() {
final InstructionList il = new InstructionList();
final MethodGen method = new MethodGen(Const.ACC_PUBLIC | Const.ACC_STATIC, Type.VOID, new Type[] { Type.OBJECT },
new String[] { "arg0" }, "test", TEST_PACKAGE+".TestArrayAccess03", il, _cp);
final InstructionHandle ih_0 = il.append(new PUSH(_cp, 1));
Assert.assertNotNull(ih_0); // TODO why is this not used
il.append(_factory.createNewArray(new ObjectType(TEST_PACKAGE+".TestArrayAccess03"), (short) 1));
il.append(InstructionFactory.createStore(Type.OBJECT, 1));
final InstructionHandle ih_5 = il.append(InstructionFactory.createLoad(Type.OBJECT, 0));
Assert.assertNotNull(ih_5); // TODO why is this not used
il.append(new PUSH(_cp, 0));
il.append(_factory.createNew(TEST_PACKAGE+".TestArrayAccess03"));
il.append(InstructionConst.DUP);
il.append(_factory.createInvoke(TEST_PACKAGE+".TestArrayAccess03", "<init>", Type.VOID, Type.NO_ARGS, Const.INVOKESPECIAL));
il.append(InstructionConst.AASTORE);
final InstructionHandle ih_15 = il.append(InstructionFactory.createReturn(Type.VOID));
Assert.assertNotNull(ih_15); // TODO why is this not used
method.setMaxStack();
method.setMaxLocals();
_cg.addMethod(method.getMethod());
il.dispose();
}
Example 2
| Source File: TestArrayAccess04Creator.java From commons-bcel with Apache License 2.0 | 6 votes |
|
private void createMethod_1() {
final InstructionList il = new InstructionList();
final MethodGen method = new MethodGen(Const.ACC_PUBLIC | Const.ACC_STATIC, Type.VOID, new Type[] { Type.OBJECT },
new String[] { "arg0" }, "test", TEST_PACKAGE+".TestArrayAccess04", il, _cp);
final InstructionHandle ih_0 = il.append(new PUSH(_cp, 1));
Assert.assertNotNull(ih_0); // TODO why is this not used
il.append(_factory.createNewArray(Type.OBJECT, (short) 1));
il.append(InstructionFactory.createStore(Type.OBJECT, 1));
final InstructionHandle ih_5 = il.append(new PUSH(_cp, 1));
Assert.assertNotNull(ih_5); // TODO why is this not used
il.append(InstructionFactory.createStore(Type.INT, 2));
final InstructionHandle ih_7 = il.append(InstructionFactory.createLoad(Type.OBJECT, 1));
Assert.assertNotNull(ih_7); // TODO why is this not used
il.append(new PUSH(_cp, 0));
il.append(InstructionFactory.createLoad(Type.INT, 2));
il.append(InstructionConst.AASTORE);
final InstructionHandle ih_11 = il.append(InstructionFactory.createReturn(Type.VOID));
Assert.assertNotNull(ih_11); // TODO why is this not used
method.setMaxStack();
method.setMaxLocals();
_cg.addMethod(method.getMethod());
il.dispose();
}
Example 3
| Source File: TestReturn01Creator.java From commons-bcel with Apache License 2.0 | 6 votes |
|
private void createMethod_1() {
final InstructionList il = new InstructionList();
final MethodGen method = new MethodGen(Const.ACC_PUBLIC | Const.ACC_STATIC, Type.VOID, Type.NO_ARGS,
new String[] { }, "foo", TEST_PACKAGE+".TestReturn01", il, _cp);
final InstructionHandle ih_0 = il.append(_factory.createNew("java.lang.Object"));
Assert.assertNotNull(ih_0); // TODO why is this not used
il.append(InstructionConst.DUP);
il.append(_factory.createInvoke("java.lang.Object", "<init>", Type.VOID, Type.NO_ARGS, Const.INVOKESPECIAL));
il.append(InstructionConst.NOP);
final InstructionHandle ih_8 = il.append(InstructionFactory.createReturn(Type.OBJECT));
Assert.assertNotNull(ih_8); // TODO why is this not used
method.setMaxStack();
method.setMaxLocals();
_cg.addMethod(method.getMethod());
il.dispose();
}
Example 4
| Source File: FindUselessObjects.java From spotbugs with GNU Lesser General Public License v2.1 | 6 votes |
|
boolean propagateToReturnValue(Set<ValueInfo> vals, ValueNumber vn, GenLocation location, MethodDescriptor m)
throws DataflowAnalysisException {
for (ValueInfo vi : vals) {
if (vi.type.getSignature().startsWith("[") && vi.hasObjectOnlyCall && vi.var == null && vn.getNumber() == vi.origValue) {
// Ignore initialized arrays passed to methods
vi.escaped = true;
count--;
}
}
if (Type.getReturnType(m.getSignature()) == Type.VOID || location instanceof ExceptionLocation) {
return false;
}
InstructionHandle nextHandle = location.getHandle().getNext();
if (nextHandle == null || (nextHandle.getInstruction() instanceof POP || nextHandle.getInstruction() instanceof POP2)) {
return false;
}
return propagateValues(vals, null, location.frameAfter().getTopValue());
}
Example 5
| Source File: TestReturn01Creator.java From commons-bcel with Apache License 2.0 | 5 votes |
|
private void createMethod_0() {
final InstructionList il = new InstructionList();
final MethodGen method = new MethodGen(Const.ACC_PUBLIC, Type.VOID, Type.NO_ARGS, new String[] { },
"<init>", TEST_PACKAGE+".TestReturn01", il, _cp);
final InstructionHandle ih_0 = il.append(InstructionFactory.createLoad(Type.OBJECT, 0));
Assert.assertNotNull(ih_0); // TODO why is this not used
il.append(_factory.createInvoke("java.lang.Object", "<init>", Type.VOID, Type.NO_ARGS, Const.INVOKESPECIAL));
final InstructionHandle ih_4 = il.append(InstructionFactory.createReturn(Type.VOID));
Assert.assertNotNull(ih_4); // TODO why is this not used
method.setMaxStack();
method.setMaxLocals();
_cg.addMethod(method.getMethod());
il.dispose();
}
Example 6
| Source File: TestArrayAccess03Creator.java From commons-bcel with Apache License 2.0 | 5 votes |
|
private void createMethod_0() {
final InstructionList il = new InstructionList();
final MethodGen method = new MethodGen(Const.ACC_PUBLIC, Type.VOID, Type.NO_ARGS, new String[] { }, "<init>",
TEST_PACKAGE+".TestArrayAccess03", il, _cp);
final InstructionHandle ih_0 = il.append(InstructionFactory.createLoad(Type.OBJECT, 0));
Assert.assertNotNull(ih_0); // TODO why is this not used
il.append(_factory.createInvoke("java.lang.Object", "<init>", Type.VOID, Type.NO_ARGS, Const.INVOKESPECIAL));
final InstructionHandle ih_4 = il.append(InstructionFactory.createReturn(Type.VOID));
Assert.assertNotNull(ih_4); // TODO why is this not used
method.setMaxStack();
method.setMaxLocals();
_cg.addMethod(method.getMethod());
il.dispose();
}
Example 7
| Source File: TestArrayAccess02Creator.java From commons-bcel with Apache License 2.0 | 5 votes |
|
private void createMethod_1() {
final InstructionList il = new InstructionList();
final MethodGen method = new MethodGen(Const.ACC_PUBLIC | Const.ACC_STATIC, Type.VOID, Type.NO_ARGS, new String[] { },
"test", TEST_PACKAGE+".TestArrayAccess02", il, _cp);
final InstructionHandle ih_0 = il.append(new PUSH(_cp, 1));
Assert.assertNotNull(ih_0); // TODO why is this not used
il.append(_factory.createNewArray(new ObjectType(TEST_PACKAGE+".TestArrayAccess02"), (short) 1));
il.append(InstructionFactory.createStore(Type.OBJECT, 0));
final InstructionHandle ih_5 = il.append(new PUSH(_cp, 1));
Assert.assertNotNull(ih_5); // TODO why is this not used
il.append(_factory.createNewArray(Type.STRING, (short) 1));
il.append(InstructionFactory.createStore(Type.OBJECT, 1));
final InstructionHandle ih_10 = il.append(InstructionFactory.createLoad(Type.OBJECT, 1));
Assert.assertNotNull(ih_10); // TODO why is this not used
il.append(new PUSH(_cp, 0));
il.append(_factory.createNew(TEST_PACKAGE+".TestArrayAccess02"));
il.append(InstructionConst.DUP);
il.append(_factory.createInvoke(TEST_PACKAGE+".TestArrayAccess02", "<init>", Type.VOID, Type.NO_ARGS, Const.INVOKESPECIAL));
il.append(InstructionConst.AASTORE);
final InstructionHandle ih_20 = il.append(InstructionFactory.createReturn(Type.VOID));
Assert.assertNotNull(ih_20); // TODO why is this not used
method.setMaxStack();
method.setMaxLocals();
_cg.addMethod(method.getMethod());
il.dispose();
}
Example 8
| Source File: TestArrayAccess02Creator.java From commons-bcel with Apache License 2.0 | 5 votes |
|
private void createMethod_0() {
final InstructionList il = new InstructionList();
final MethodGen method = new MethodGen(Const.ACC_PUBLIC, Type.VOID, Type.NO_ARGS, new String[] { }, "<init>",
TEST_PACKAGE+".TestArrayAccess02", il, _cp);
final InstructionHandle ih_0 = il.append(InstructionFactory.createLoad(Type.OBJECT, 0));
Assert.assertNotNull(ih_0); // TODO why is this not used
il.append(_factory.createInvoke("java.lang.Object", "<init>", Type.VOID, Type.NO_ARGS, Const.INVOKESPECIAL));
final InstructionHandle ih_4 = il.append(InstructionFactory.createReturn(Type.VOID));
Assert.assertNotNull(ih_4); // TODO why is this not used
method.setMaxStack();
method.setMaxLocals();
_cg.addMethod(method.getMethod());
il.dispose();
}
Example 9
| Source File: TestReturn03Creator.java From commons-bcel with Apache License 2.0 | 5 votes |
|
private void createMethod_0() {
final InstructionList il = new InstructionList();
final MethodGen method = new MethodGen(Const.ACC_PUBLIC, Type.VOID, Type.NO_ARGS, new String[] { },
"<init>", TEST_PACKAGE+".TestReturn03", il, _cp);
final InstructionHandle ih_0 = il.append(InstructionFactory.createLoad(Type.OBJECT, 0));
Assert.assertNotNull(ih_0); // TODO why is this not used
il.append(_factory.createInvoke("java.lang.Object", "<init>", Type.VOID, Type.NO_ARGS, Const.INVOKESPECIAL));
final InstructionHandle ih_4 = il.append(InstructionFactory.createReturn(Type.VOID));
Assert.assertNotNull(ih_4); // TODO why is this not used
method.setMaxStack();
method.setMaxLocals();
_cg.addMethod(method.getMethod());
il.dispose();
}
Example 10
| Source File: TestArrayAccess04Creator.java From commons-bcel with Apache License 2.0 | 5 votes |
|
private void createMethod_0() {
final InstructionList il = new InstructionList();
final MethodGen method = new MethodGen(Const.ACC_PUBLIC, Type.VOID, Type.NO_ARGS, new String[] { }, "<init>",
TEST_PACKAGE+".TestArrayAccess04", il, _cp);
final InstructionHandle ih_0 = il.append(InstructionFactory.createLoad(Type.OBJECT, 0));
Assert.assertNotNull(ih_0); // TODO why is this not used
il.append(_factory.createInvoke("java.lang.Object", "<init>", Type.VOID, Type.NO_ARGS, Const.INVOKESPECIAL));
final InstructionHandle ih_4 = il.append(InstructionFactory.createReturn(Type.VOID));
Assert.assertNotNull(ih_4); // TODO why is this not used
method.setMaxStack();
method.setMaxLocals();
_cg.addMethod(method.getMethod());
il.dispose();
}
Example 11
| Source File: Pass2Verifier.java From commons-bcel with Apache License 2.0 | 5 votes |
|
@Override
public void visitConstantInterfaceMethodref(final ConstantInterfaceMethodref obj) {
if (obj.getTag() != Const.CONSTANT_InterfaceMethodref) {
throw new ClassConstraintException("ConstantInterfaceMethodref '"+tostring(obj)+"' has wrong tag!");
}
final int name_and_type_index = obj.getNameAndTypeIndex();
final ConstantNameAndType cnat = (ConstantNameAndType) (cp.getConstant(name_and_type_index));
final String name = ((ConstantUtf8) (cp.getConstant(cnat.getNameIndex()))).getBytes(); // Field or Method name
if (!validInterfaceMethodName(name)) {
throw new ClassConstraintException("Invalid (interface) method name '"+name+"' referenced by '"+tostring(obj)+"'.");
}
final int class_index = obj.getClassIndex();
final ConstantClass cc = (ConstantClass) (cp.getConstant(class_index));
final String className = ((ConstantUtf8) (cp.getConstant(cc.getNameIndex()))).getBytes(); // Class Name in internal form
if (! validClassName(className)) {
throw new ClassConstraintException("Illegal class name '"+className+"' used by '"+tostring(obj)+"'.");
}
final String sig = ((ConstantUtf8) (cp.getConstant(cnat.getSignatureIndex()))).getBytes(); // Field or Method sig.(=descriptor)
try{
final Type t = Type.getReturnType(sig);
if ( name.equals(Const.STATIC_INITIALIZER_NAME) && (t != Type.VOID) ) {
addMessage("Class or interface initialization method '"+Const.STATIC_INITIALIZER_NAME+
"' usually has VOID return type instead of '"+t+
"'. Note this is really not a requirement of The Java Virtual Machine Specification, Second Edition.");
}
}
catch (final ClassFormatException cfe) {
throw new ClassConstraintException("Illegal descriptor (==signature) '"+sig+"' used by '"+tostring(obj)+"'.", cfe);
}
}
Example 12
| Source File: Pass2Verifier.java From commons-bcel with Apache License 2.0 | 5 votes |
|
@Override
public void visitConstantMethodref(final ConstantMethodref obj) {
if (obj.getTag() != Const.CONSTANT_Methodref) {
throw new ClassConstraintException("ConstantMethodref '"+tostring(obj)+"' has wrong tag!");
}
final int name_and_type_index = obj.getNameAndTypeIndex();
final ConstantNameAndType cnat = (ConstantNameAndType) (cp.getConstant(name_and_type_index));
final String name = ((ConstantUtf8) (cp.getConstant(cnat.getNameIndex()))).getBytes(); // Field or Method name
if (!validClassMethodName(name)) {
throw new ClassConstraintException(
"Invalid (non-interface) method name '"+name+"' referenced by '"+tostring(obj)+"'.");
}
final int class_index = obj.getClassIndex();
final ConstantClass cc = (ConstantClass) (cp.getConstant(class_index));
final String className = ((ConstantUtf8) (cp.getConstant(cc.getNameIndex()))).getBytes(); // Class Name in internal form
if (! validClassName(className)) {
throw new ClassConstraintException("Illegal class name '"+className+"' used by '"+tostring(obj)+"'.");
}
final String sig = ((ConstantUtf8) (cp.getConstant(cnat.getSignatureIndex()))).getBytes(); // Field or Method sig.(=descriptor)
try{
final Type t = Type.getReturnType(sig);
if ( name.equals(Const.CONSTRUCTOR_NAME) && (t != Type.VOID) ) {
throw new ClassConstraintException("Instance initialization method must have VOID return type.");
}
}
catch (final ClassFormatException cfe) {
throw new ClassConstraintException("Illegal descriptor (==signature) '"+sig+"' used by '"+tostring(obj)+"'.", cfe);
}
}
Example 13
| Source File: ComplexObjectCreator.java From cougar with Apache License 2.0 | 5 votes |
|
private void createMethod_0() {
InstructionList il = new InstructionList();
MethodGen method = new MethodGen(ACC_PUBLIC, Type.VOID, Type.NO_ARGS, new String[] { }, "<init>", objectType, il, _cp);
InstructionHandle ih_0 = il.append(_factory.createLoad(Type.OBJECT, 0));
il.append(_factory.createInvoke("java.lang.Object", "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
InstructionHandle ih_4 = il.append(_factory.createReturn(Type.VOID));
method.setMaxStack();
method.setMaxLocals();
_cg.addMethod(method.getMethod());
il.dispose();
}
Example 14
| Source File: ComplexObjectCreator.java From cougar with Apache License 2.0 | 5 votes |
|
private void createMethod_0() {
InstructionList il = new InstructionList();
MethodGen method = new MethodGen(ACC_PUBLIC, Type.VOID, Type.NO_ARGS, new String[] { }, "<init>", objectType, il, _cp);
InstructionHandle ih_0 = il.append(_factory.createLoad(Type.OBJECT, 0));
il.append(_factory.createInvoke("java.lang.Object", "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
InstructionHandle ih_4 = il.append(_factory.createReturn(Type.VOID));
method.setMaxStack();
method.setMaxLocals();
_cg.addMethod(method.getMethod());
il.dispose();
}
Example 15
| Source File: ComplexObjectCreator.java From cougar with Apache License 2.0 | 5 votes |
|
private void createMethod_0() {
InstructionList il = new InstructionList();
MethodGen method = new MethodGen(ACC_PUBLIC, Type.VOID, Type.NO_ARGS, new String[] { }, "<init>", objectType, il, _cp);
InstructionHandle ih_0 = il.append(_factory.createLoad(Type.OBJECT, 0));
il.append(_factory.createInvoke("java.lang.Object", "<init>", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));
InstructionHandle ih_4 = il.append(_factory.createReturn(Type.VOID));
method.setMaxStack();
method.setMaxLocals();
_cg.addMethod(method.getMethod());
il.dispose();
}
Example 16
| Source File: FindNoSideEffectMethods.java From spotbugs with GNU Lesser General Public License v2.1 | 5 votes |
|
/**
* @param methodDescriptor
*/
private void sawNoSideEffectCall(MethodDescriptor methodDescriptor) {
if (uselessVoidCandidate && Type.getReturnType(methodDescriptor.getSignature()) == Type.VOID
&& !methodDescriptor.getName().equals(Const.CONSTRUCTOR_NAME)) {
/* To reduce false-positives we do not mark method as useless void if it calls
* another useless void method. If that another method also in the scope of our project
* then we will report it instead. If there's a cycle of no-side-effect calls, then
* it's probably some delegation pattern and methods can be extended in future/derived
* projects to do something useful.
*/
uselessVoidCandidate = false;
}
}
Example 17
| Source File: ProxyCreator.java From commons-bcel with Apache License 2.0 | 4 votes |
|
/**
* Create JavaClass object for a simple proxy for an java.awt.event.ActionListener
* that just prints the passed arguments, load and use it via the class loader
* mechanism.
*/
public static void main(final String[] argv) throws Exception {
final ClassLoader loader = ProxyCreator.class.getClassLoader();
// instanceof won't work here ...
// TODO this is broken; cannot ever be true now that ClassLoader has been dropped
if (loader.getClass().toString().equals("class org.apache.bcel.util.ClassLoader")) {
// Real class name will be set by the class loader
final ClassGen cg = new ClassGen("foo", "java.lang.Object", "", Constants.ACC_PUBLIC,
new String[]{"java.awt.event.ActionListener"});
// That's important, otherwise newInstance() won't work
cg.addEmptyConstructor(Constants.ACC_PUBLIC);
final InstructionList il = new InstructionList();
final ConstantPoolGen cp = cg.getConstantPool();
final InstructionFactory factory = new InstructionFactory(cg);
final int out = cp.addFieldref("java.lang.System", "out",
"Ljava/io/PrintStream;");
final int println = cp.addMethodref("java.io.PrintStream", "println",
"(Ljava/lang/Object;)V");
final MethodGen mg = new MethodGen(Constants.ACC_PUBLIC, Type.VOID,
new Type[]{
new ObjectType("java.awt.event.ActionEvent")
}, null, "actionPerformed", "foo", il, cp);
// System.out.println("actionPerformed:" + event);
il.append(new GETSTATIC(out));
il.append(factory.createNew("java.lang.StringBuffer"));
il.append(InstructionConstants.DUP);
il.append(new PUSH(cp, "actionPerformed:"));
il.append(factory.createInvoke("java.lang.StringBuffer", "<init>", Type.VOID,
new Type[]{Type.STRING}, Constants.INVOKESPECIAL));
il.append(new ALOAD(1));
il.append(factory.createAppend(Type.OBJECT));
il.append(new INVOKEVIRTUAL(println));
il.append(InstructionConstants.RETURN);
mg.stripAttributes(true);
mg.setMaxStack();
mg.setMaxLocals();
cg.addMethod(mg.getMethod());
final byte[] bytes = cg.getJavaClass().getBytes();
System.out.println("Uncompressed class: " + bytes.length);
final String s = Utility.encode(bytes, true);
System.out.println("Encoded class: " + s.length());
System.out.print("Creating proxy ... ");
final ActionListener a = (ActionListener) createProxy("foo.bar.", s);
System.out.println("Done. Now calling actionPerformed()");
a.actionPerformed(new ActionEvent(a, ActionEvent.ACTION_PERFORMED, "hello"));
} else {
System.err.println("Call me with java org.apache.bcel.util.JavaWrapper ProxyCreator");
}
}
Example 18
| Source File: FindNoSideEffectMethods.java From spotbugs with GNU Lesser General Public License v2.1 | 4 votes |
|
@Override
public void visit(Code obj) {
uselessVoidCandidate = !classInit && !constructor && !getXMethod().isSynthetic() && Type.getReturnType(getMethodSig()) == Type.VOID;
byte[] code = obj.getCode();
if (code.length == 4 && (code[0] & 0xFF) == Const.GETSTATIC && (code[3] & 0xFF) == Const.ARETURN) {
getStaticMethods.add(getMethodDescriptor());
handleStatus();
return;
}
if (code.length <= 2 && !getXMethod().isStatic() && (getXMethod().isPublic() || getXMethod().isProtected())
&& !getXMethod().isFinal() && (getXClass().isPublic() || getXClass().isProtected())) {
for (byte[] stubMethod : STUB_METHODS) {
if (Arrays.equals(stubMethod, code)
&& (getClassName().endsWith("Visitor") || getClassName().endsWith("Listener") || !hasOtherImplementations(getXMethod()))) {
// stub method which can be extended: assume it can be extended with possible side-effect
status = SideEffectStatus.SIDE_EFFECT;
handleStatus();
return;
}
}
}
if (statusMap.containsKey(getMethodDescriptor())) {
return;
}
finallyTargets = new HashSet<>();
for (CodeException ex : getCode().getExceptionTable()) {
if (ex.getCatchType() == 0) {
finallyTargets.add(ex.getHandlerPC());
}
}
finallyExceptionRegisters = new HashSet<>();
try {
super.visit(obj);
} catch (EarlyExitException e) {
// Ignore
}
if (uselessVoidCandidate && code.length > 1
&& (status == SideEffectStatus.UNSURE || status == SideEffectStatus.NO_SIDE_EFFECT)) {
uselessVoidCandidates.add(getMethodDescriptor());
}
handleStatus();
}
