Package org.objectweb.asm

Examples of org.objectweb.asm.Label

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    public void writeContinue(ContinueStatement statement) {
        controller.getAcg().onLineNumber(statement, "visitContinueStatement");
        writeStatementLabel(statement);

        String name = statement.getLabel();
        Label continueLabel = controller.getCompileStack().getContinueLabel();
        if (name != null) continueLabel = controller.getCompileStack().getNamedContinueLabel(name);
        controller.getCompileStack().applyFinallyBlocks(continueLabel, false);
        controller.getMethodVisitor().visitJumpInsn(GOTO, continueLabel);
    }
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        statement.getExpression().visit(controller.getAcg());
        controller.getOperandStack().box();
        final int index = compileStack.defineTemporaryVariable("synchronized", ClassHelper.OBJECT_TYPE, true);

        final Label synchronizedStart = new Label();
        final Label synchronizedEnd = new Label();
        final Label catchAll = new Label();

        mv.visitVarInsn(ALOAD, index);
        mv.visitInsn(MONITORENTER);
        mv.visitLabel(synchronizedStart);
        // place holder for "empty" synchronized blocks, for example
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    private static MethodVisitor writeMethod(ClassWriter cw, String name, int argumentCount, final String superClass, CachedMethod cachedMethod, String receiverType, String parameterDescription, boolean useArray) {
        MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "call" + name, "(L" + receiverType + ";" + parameterDescription + ")Ljava/lang/Object;", null, null);
        mv.visitCode();
       
        final Label tryStart = new Label();
        mv.visitLabel(tryStart);
       
        // call for checking if method is still valid
        for (int i = 0; i < argumentCount; ++i) mv.visitVarInsn(Opcodes.ALOAD, i);
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, superClass, "checkCall", "(Ljava/lang/Object;" + parameterDescription + ")Z");
        Label l0 = new Label();
        mv.visitJumpInsn(Opcodes.IFEQ, l0);
       
        // valid method branch

        Class callClass = cachedMethod.getDeclaringClass().getTheClass();
        boolean useInterface = callClass.isInterface();

        String type = BytecodeHelper.getClassInternalName(callClass.getName());
        String descriptor = BytecodeHelper.getMethodDescriptor(cachedMethod.getReturnType(), cachedMethod.getNativeParameterTypes());
       
        // prepare call
        int invokeMethodCode = Opcodes.INVOKEVIRTUAL;
        if (cachedMethod.isStatic()) {
            invokeMethodCode = Opcodes.INVOKESTATIC;
        } else {
            mv.visitVarInsn(Opcodes.ALOAD, 1);
            BytecodeHelper.doCast(mv, callClass);
            if (useInterface) invokeMethodCode = Opcodes.INVOKEINTERFACE;
        }
       
        Method method = cachedMethod.setAccessible();
        Class<?>[] parameters = method.getParameterTypes();
        int size = parameters.length;
        for (int i = 0; i < size; i++) {
            if (useArray) {
                // unpack argument from Object[]
                mv.visitVarInsn(Opcodes.ALOAD, 2);
                BytecodeHelper.pushConstant(mv, i);
                mv.visitInsn(Opcodes.AALOAD);
            } else {
                mv.visitVarInsn(Opcodes.ALOAD, i+2);
            }

            // cast argument to parameter class, inclusive unboxing
            // for methods with primitive types
            BytecodeHelper.doCast(mv, parameters[i]);
        }       
       
        // make call
        mv.visitMethodInsn(invokeMethodCode, type, cachedMethod.getName(), descriptor);

        // produce result
        BytecodeHelper.box(mv, cachedMethod.getReturnType());
        if (cachedMethod.getReturnType() == void.class) {
            mv.visitInsn(Opcodes.ACONST_NULL);
        }

        // return
        mv.visitInsn(Opcodes.ARETURN);
       
        // fall back after method change
        mv.visitLabel(l0);
        for (int i = 0; i < argumentCount; ++i) mv.visitVarInsn(Opcodes.ALOAD, i);
        if (!useArray) {
            mv.visitMethodInsn(Opcodes.INVOKESTATIC, "org/codehaus/groovy/runtime/ArrayUtil", "createArray", "(" + parameterDescription + ")[Ljava/lang/Object;");
        }
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, "org/codehaus/groovy/runtime/callsite/CallSiteArray", "defaultCall" + name, "(Lorg/codehaus/groovy/runtime/callsite/CallSite;L" + receiverType + ";[Ljava/lang/Object;)Ljava/lang/Object;");
        mv.visitInsn(Opcodes.ARETURN);
       
        // exception unwrapping for stackless exceptions
        final Label tryEnd = new Label();
        mv.visitLabel(tryEnd);
        final Label catchStart = new Label();
        mv.visitLabel(catchStart);
        mv.visitMethodInsn(Opcodes.INVOKESTATIC, "org/codehaus/groovy/runtime/ScriptBytecodeAdapter", "unwrap", "(Lgroovy/lang/GroovyRuntimeException;)Ljava/lang/Throwable;");
        mv.visitInsn(Opcodes.ATHROW);       
        mv.visitTryCatchBlock(tryStart, tryEnd, catchStart, GRE);
       
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    TraceMethodVisitor tmv = new TraceMethodVisitor(null);
    RemoveDeadCodeAdapter mv = new RemoveDeadCodeAdapter("pkg/Bean",
        ACC_PUBLIC, "checkAndSetF", "(I)V", tmv);
    mv.visitCode();
    mv.visitVarInsn(ILOAD, 1);
    Label label = new Label();
    mv.visitJumpInsn(IFLT, label);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ILOAD, 1);
    mv.visitFieldInsn(PUTFIELD, "pkg/Bean", "f", "I");
    Label end = new Label();
    mv.visitInsn(RETURN);
    mv.visitLabel(label);
    mv.visitFrame(F_SAME, 0, null, 0, null);
    mv.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
    mv.visitInsn(DUP);
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  protected void checkMethod(TraceMethodVisitor tmv) {
    TraceMethodVisitor mv = new TraceMethodVisitor(null);
    mv.visitCode();
    mv.visitVarInsn(ILOAD, 1);
    Label label = new Label();
    mv.visitJumpInsn(IFLT, label);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ILOAD, 1);
    mv.visitFieldInsn(PUTFIELD, "pkg/Bean", "f", "I");
    mv.visitInsn(RETURN);
    mv.visitLabel(label);
    mv.visitFrame(F_SAME, 0, null, 0, null);
    mv.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
    mv.visitInsn(DUP);
    mv.visitMethodInsn(INVOKESPECIAL,
        "java/lang/IllegalArgumentException", "<init>", "()V");
    mv.visitInsn(ATHROW);
    mv.visitLabel(new Label());
    mv.visitMaxs(2, 2);
    mv.visitEnd();
    assertEquals(mv, tmv);
  }
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  public void test() {
    TraceMethodVisitor tmv = new TraceMethodVisitor(null);
    MethodNode mn = new MethodNode(0, null, null, null, null);
    mn.visitCode();
    mn.visitVarInsn(ILOAD, 1);
    Label label = new Label();
    mn.visitJumpInsn(IFLT, label);
    mn.visitVarInsn(ALOAD, 0);
    mn.visitVarInsn(ILOAD, 1);
    mn.visitFieldInsn(PUTFIELD, "pkg/Bean", "f", "I");
    Label end = new Label();
    mn.visitJumpInsn(GOTO, end);
    mn.visitLabel(label);
    mn.visitFrame(F_SAME, 0, null, 0, null);
    mn.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
    mn.visitInsn(DUP);
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  protected void checkMethod(TraceMethodVisitor tmv) {
    TraceMethodVisitor mv = new TraceMethodVisitor(null);
    mv.visitCode();
    mv.visitVarInsn(ILOAD, 1);
    Label label = new Label();
    mv.visitJumpInsn(IFLT, label);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ILOAD, 1);
    mv.visitFieldInsn(PUTFIELD, "pkg/Bean", "f", "I");
    Label end = new Label();
    mv.visitInsn(RETURN);
    mv.visitLabel(label);
    mv.visitFrame(F_SAME, 0, null, 0, null);
    mv.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
    mv.visitInsn(DUP);
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public class NullDereferenceAnalyzerTest extends AbstractTestCase {

  public void test() throws Exception {
    MethodNode mn = new MethodNode(ACC_PUBLIC, "m", "(ZZ)V", null, null);
    mn.visitCode();
    Label l0 = new Label();
    Label l1 = new Label();
    Label l2 = new Label();
    Label l3 = new Label();
    Label l4 = new Label();
    Label l5 = new Label();
    Label l6 = new Label();
    mn.visitTryCatchBlock(l0, l1, l2, null);
    mn.visitTryCatchBlock(l2, l3, l2, null);
    mn.visitInsn(ACONST_NULL); // insn 0
    mn.visitVarInsn(ASTORE, 3);
    mn.visitInsn(ACONST_NULL); // insn 2
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      Type bean = Type.getType("Lpkg/Bean;");
      Method m = Method.getMethod("void checkAndSetF(int)");
      GeneratorAdapter ga = new GeneratorAdapter(ACC_PUBLIC, m, mv);
      ga.visitCode();
      ga.loadArg(0);
      Label label = new Label();
      ga.ifZCmp(GeneratorAdapter.LT, label);
      ga.loadThis();
      ga.loadArg(0);
      ga.putField(bean, "f", Type.INT_TYPE);
      Label end = new Label();
      ga.goTo(end);
      ga.mark(label);
      ga.throwException(Type.getType(IllegalArgumentException.class),
          "f");
      ga.mark(end);
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    }
    mv = cv.visitMethod(ACC_PUBLIC, "checkAndSetF", "(I)V", null, null);
    if (mv != null) {
      mv.visitCode();
      mv.visitVarInsn(ILOAD, 1);
      Label label = new Label();
      mv.visitJumpInsn(IFLT, label);
      mv.visitVarInsn(ALOAD, 0);
      mv.visitVarInsn(ILOAD, 1);
      mv.visitFieldInsn(PUTFIELD, "pkg/Bean", "f", "I");
      Label end = new Label();
      mv.visitJumpInsn(GOTO, end);
      mv.visitLabel(label);
      mv.visitFrame(F_SAME, 0, null, 0, null);
      mv.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
      mv.visitInsn(DUP);
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