Example usage for org.objectweb.asm Opcodes RETURN

List of usage examples for org.objectweb.asm Opcodes RETURN

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Prototype

int RETURN

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Usage

From source file:com.nginious.http.xsp.MessageTagPart.java

License:Apache License

/**
 * Creates bytecode in a separate method for evaluating this message tag part.
 * /*from   w  ww  . j  a  v  a  2s.  c  o m*/
 * @param intClassName the binary class name of the class being created
 * @param writer the class writer
 * @throws XspException if unable to create bytecode
 */
void compileMethod(String intClassName, ClassWriter writer) throws XspException {
    MethodVisitor visitor = writer.visitMethod(Opcodes.ACC_PRIVATE, this.methodName,
            "(Lcom/nginious/http/HttpRequest;Lcom/nginious/http/HttpResponse;Ljava/lang/StringBuffer;)V", null,
            null);
    visitor.visitCode();

    if (this.var != null) {
        visitor.visitVarInsn(Opcodes.ALOAD, 1);
        var.compile(visitor, Type.STRING);
    } else {
        visitor.visitVarInsn(Opcodes.ALOAD, 3);
    }

    bundle.compile(visitor, Type.STRING);
    visitor.visitVarInsn(Opcodes.ALOAD, 2);
    visitor.visitMethodInsn(Opcodes.INVOKEINTERFACE, "com/nginious/http/HttpResponse", "getLocale",
            "()Ljava/util/Locale;");
    visitor.visitMethodInsn(Opcodes.INVOKESTATIC, "java/util/ResourceBundle", "getBundle",
            "(Ljava/lang/String;Ljava/util/Locale;)Ljava/util/ResourceBundle;");

    key.compile(visitor, Type.STRING);
    visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/util/ResourceBundle", "getString",
            "(Ljava/lang/String;)Ljava/lang/String;");

    if (this.args != null) {
        try {
            String expression = args.getExpressionContent();
            ExpressionParser parser = new ExpressionParser();
            TreeExpression expr = parser.parse(expression);

            if (expr.getType() != Type.ANY) {
                throw new XspException("Expression in attribute value in args " + getName()
                        + " is not an attribute or bean property " + " at line " + getLocationDescriptor());
            }

            expr.compile(visitor, Type.ANY);
            visitor.visitTypeInsn(Opcodes.CHECKCAST, "[Ljava/lang/Object;");
            visitor.visitMethodInsn(Opcodes.INVOKESTATIC, "java/text/MessageFormat", "format",
                    "(Ljava/lang/String;[Ljava/lang/Object;)Ljava/lang/String;");
        } catch (ExpressionException e) {
            throw new XspException("Invalid expression in attribute value in tag " + getName() + " at line "
                    + getLocationDescriptor(), e);
        }
    }

    if (this.var != null) {
        visitor.visitMethodInsn(Opcodes.INVOKEINTERFACE, "com/nginious/http/HttpRequest", "setAttribute",
                "(Ljava/lang/String;Ljava/lang/Object;)V");
    } else {
        visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuffer", "append",
                "(Ljava/lang/String;)Ljava/lang/StringBuffer;");
        visitor.visitInsn(Opcodes.POP);
    }

    visitor.visitInsn(Opcodes.RETURN);
    visitor.visitMaxs(5, 5);
    visitor.visitEnd();

    super.compileMethod(intClassName, writer);
}

From source file:com.nginious.http.xsp.StaticPart.java

License:Apache License

/**
 * Creates bytecode in a separate method for evaluating an expression.
 * /*from   w w w  . ja v  a 2 s.c  o  m*/
 * @param intClassName the binary class name of the class being created
 * @param writer the class writer
 * @throws XspException if unable to create bytecode
 */
void compileMethod(String intClassName, ClassWriter writer) throws XspException {
    if (!isExpression()) {
        return;
    }

    try {
        ExpressionParser parser = new ExpressionParser();
        TreeExpression expr = parser.parse(getExpressionContent());

        MethodVisitor visitor = writer.visitMethod(Opcodes.ACC_PRIVATE, this.methodName,
                "(Ljava/lang/StringBuffer;)V", null, null);
        visitor.visitCode();
        visitor.visitVarInsn(Opcodes.ALOAD, 1);

        if (expr.getType() == Type.ANY) {
            expr.compile(visitor, Type.STRING);
        } else {
            expr.compile(visitor);
        }

        if (expr.getType() == Type.BOOLEAN) {
            visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuffer", "append",
                    "(Z)Ljava/lang/StringBuffer;");
        } else if (expr.getType() == Type.DOUBLE) {
            visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuffer", "append",
                    "(D)Ljava/lang/StringBuffer;");
        } else if (expr.getType() == Type.INT) {
            visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuffer", "append",
                    "(I)Ljava/lang/StringBuffer;");
        } else if (expr.getType() == Type.STRING || expr.getType() == Type.ANY) {
            visitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/StringBuffer", "append",
                    "(Ljava/lang/String;)Ljava/lang/StringBuffer;");
        }

        visitor.visitInsn(Opcodes.POP);
        visitor.visitInsn(Opcodes.RETURN);
        visitor.visitMaxs(5, 5);
        visitor.visitEnd();
    } catch (ExpressionException e) {
        throw new XspException("Invalid expression at " + getLocationDescriptor(), e);
    }
}

From source file:com.nginious.http.xsp.XspCompiler.java

License:Apache License

/**
 * Creates a constructor with no arguments for the XSP service class being created with the
 * specified class writer. Bytecode is created for calling the superclass constructor in the
 * superclass with the specified supperclass name.
 * /*from   ww w  .  j av a2s . com*/
 * @param writer the class writer
 * @param superclassName the superclass name
 * @see XspService
 */
void createConstructor(ClassWriter writer, String superclassName) {
    MethodVisitor visitor = writer.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
    visitor.visitCode();
    visitor.visitVarInsn(Opcodes.ALOAD, 0);
    visitor.visitMethodInsn(Opcodes.INVOKESPECIAL, superclassName, "<init>", "()V");
    visitor.visitInsn(Opcodes.RETURN);
    visitor.visitMaxs(1, 1);
    visitor.visitEnd();
}

From source file:com.nway.spring.jdbc.bean.AsmBeanProcessor.java

License:Apache License

/**
 *
 * //from w ww .  j  a  v  a 2 s . c  o  m
 *
 * @param cw
 * @param mv
 * @param processorName com/nway/commons/dbutils/DynamicBeanProcessorImpl
 * @param beanName com/nway/commons/dbutils/test/User
 * @return [0]:bean[1]createBean
 */
private Object[] prepScript(ClassWriter cw, MethodVisitor mv, String processorName, String beanName) {

    Object[] lab = new Object[2];

    cw.visit(Opcodes.V1_5, Opcodes.ACC_PUBLIC + Opcodes.ACC_SUPER, processorName, null,
            "com/nway/spring/jdbc/bean/DbBeanFactory", null);

    cw.visitSource(processorName.substring(processorName.lastIndexOf('/') + 1) + ".java", null);

    {
        mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        Label l0 = new Label();
        mv.visitLabel(l0);
        mv.visitLineNumber(6, l0);
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "com/nway/spring/jdbc/bean/DbBeanFactory", "<init>", "()V",
                false);
        mv.visitInsn(Opcodes.RETURN);
        Label l1 = new Label();
        mv.visitLabel(l1);
        mv.visitLocalVariable("this", "L" + processorName + ";", null, l0, l1, 0);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "createBean",
                "(Ljava/sql/ResultSet;Ljava/lang/Class;)Ljava/lang/Object;",
                "<T:Ljava/lang/Object;>(Ljava/sql/ResultSet;Ljava/lang/Class<TT;>;)TT;",
                new String[] { "java/sql/SQLException" });
        mv.visitCode();
        Label l0 = new Label();
        mv.visitLabel(l0);
        mv.visitLineNumber(10, l0);
        mv.visitTypeInsn(Opcodes.NEW, beanName);
        mv.visitInsn(Opcodes.DUP);
        mv.visitMethodInsn(Opcodes.INVOKESPECIAL, beanName, "<init>", "()V", false);
        mv.visitVarInsn(Opcodes.ASTORE, 3);

        lab[0] = l0;
        lab[1] = mv;
    }

    return lab;
}

From source file:com.offbynull.coroutines.instrumenter.asm.InstructionUtils.java

License:Open Source License

/**
 * Generates instructions that returns a dummy value. Return values are as follows:
 * <ul>/*from   w  w  w . j a v a 2 s  .  c o m*/
 * <li>void -&gt; no value</li>
 * <li>boolean -&gt; false</li>
 * <li>byte/short/char/int -&gt; 0</li>
 * <li>long -&gt; 0L</li>
 * <li>float -&gt; 0.0f</li>
 * <li>double -&gt; 0.0</li>
 * <li>Object -&gt; null</li>
 * </ul>
 *
 * @param returnType return type of the method this generated bytecode is for
 * @return instructions to return a dummy value
 * @throws NullPointerException if any argument is {@code null}
 * @throws IllegalArgumentException if {@code returnType}'s sort is of {@link Type#METHOD}
 */
public static InsnList returnDummy(Type returnType) {
    Validate.notNull(returnType);
    Validate.isTrue(returnType.getSort() != Type.METHOD);

    InsnList ret = new InsnList();

    switch (returnType.getSort()) {
    case Type.VOID:
        ret.add(new InsnNode(Opcodes.RETURN));
        break;
    case Type.BOOLEAN:
    case Type.BYTE:
    case Type.SHORT:
    case Type.CHAR:
    case Type.INT:
        ret.add(new InsnNode(Opcodes.ICONST_0));
        ret.add(new InsnNode(Opcodes.IRETURN));
        break;
    case Type.LONG:
        ret.add(new InsnNode(Opcodes.LCONST_0));
        ret.add(new InsnNode(Opcodes.LRETURN));
        break;
    case Type.FLOAT:
        ret.add(new InsnNode(Opcodes.FCONST_0));
        ret.add(new InsnNode(Opcodes.FRETURN));
        break;
    case Type.DOUBLE:
        ret.add(new InsnNode(Opcodes.DCONST_0));
        ret.add(new InsnNode(Opcodes.DRETURN));
        break;
    case Type.OBJECT:
    case Type.ARRAY:
        ret.add(new InsnNode(Opcodes.ACONST_NULL));
        ret.add(new InsnNode(Opcodes.ARETURN));
        break;
    default:
        throw new IllegalStateException();
    }

    return ret;
}

From source file:com.offbynull.coroutines.instrumenter.asm.InstructionUtils.java

License:Open Source License

/**
 * Generates instructions that returns a value.
 *
 * @param returnType return type of the method this generated bytecode is for
 * @param returnValueInsnList instructions that produce the return value (should leave it on the top of the stack)
 * @return instructions to return a value
 * @throws NullPointerException if any argument is {@code null}
 * @throws IllegalArgumentException if {@code returnType}'s sort is of {@link Type#METHOD}
 *//* w  ww .  j a v a 2s . com*/
public static InsnList returnValue(Type returnType, InsnList returnValueInsnList) {
    Validate.notNull(returnType);
    Validate.isTrue(returnType.getSort() != Type.METHOD);

    InsnList ret = new InsnList();

    ret.add(returnValueInsnList);

    switch (returnType.getSort()) {
    case Type.VOID:
        ret.add(new InsnNode(Opcodes.RETURN));
        break;
    case Type.BOOLEAN:
    case Type.BYTE:
    case Type.SHORT:
    case Type.CHAR:
    case Type.INT:
        ret.add(new InsnNode(Opcodes.IRETURN));
        break;
    case Type.LONG:
        ret.add(new InsnNode(Opcodes.LRETURN));
        break;
    case Type.FLOAT:
        ret.add(new InsnNode(Opcodes.FRETURN));
        break;
    case Type.DOUBLE:
        ret.add(new InsnNode(Opcodes.DRETURN));
        break;
    case Type.OBJECT:
    case Type.ARRAY:
        ret.add(new InsnNode(Opcodes.ARETURN));
        break;
    default:
        throw new IllegalStateException();
    }

    return ret;
}

From source file:com.offbynull.coroutines.instrumenter.ContinuationGenerators.java

License:Open Source License

/**
 * Generates instructions that returns a dummy value. Return values are as follows:
 * <ul>/*from w  ww. j a v a2s .  c  o m*/
 * <li>void -&gt; no value</li>
 * <li>boolean -&gt; false</li>
 * <li>byte/short/char/int -&gt; 0</li>
 * <li>long -&gt; 0L</li>
 * <li>float -&gt; 0.0f</li>
 * <li>double -&gt; 0.0</li>
 * <li>Object -&gt; null</li>
 * </ul>
 *
 * @param returnType return type of the method this generated bytecode is for
 * @return instructions to return a dummy value
 * @throws NullPointerException if any argument is {@code null}
 * @throws IllegalArgumentException if {@code returnType}'s sort is of {@link Type#METHOD}
 */
private static InsnList returnDummy(Type returnType) {
    Validate.notNull(returnType);
    Validate.isTrue(returnType.getSort() != Type.METHOD);

    InsnList ret = new InsnList();

    switch (returnType.getSort()) {
    case Type.VOID:
        ret.add(new InsnNode(Opcodes.RETURN));
        break;
    case Type.BOOLEAN:
    case Type.BYTE:
    case Type.SHORT:
    case Type.CHAR:
    case Type.INT:
        ret.add(new InsnNode(Opcodes.ICONST_0));
        ret.add(new InsnNode(Opcodes.IRETURN));
        break;
    case Type.LONG:
        ret.add(new InsnNode(Opcodes.LCONST_0));
        ret.add(new InsnNode(Opcodes.LRETURN));
        break;
    case Type.FLOAT:
        ret.add(new InsnNode(Opcodes.FCONST_0));
        ret.add(new InsnNode(Opcodes.FRETURN));
        break;
    case Type.DOUBLE:
        ret.add(new InsnNode(Opcodes.DCONST_0));
        ret.add(new InsnNode(Opcodes.DRETURN));
        break;
    case Type.OBJECT:
    case Type.ARRAY:
        ret.add(new InsnNode(Opcodes.ACONST_NULL));
        ret.add(new InsnNode(Opcodes.ARETURN));
        break;
    default:
        throw new IllegalStateException();
    }

    return ret;
}

From source file:com.sixrr.metrics.profile.instanceHolder.MetricInstanceHolder.java

License:Apache License

private void loadMetricsFromProviders() {
    for (MetricProvider provider : MetricProvider.EXTENSION_POINT_NAME.getExtensions()) {
        final List<Class<? extends Metric>> classesForProvider = provider.getMetricClasses();

        for (Class<? extends Metric> aClass : classesForProvider) {
            try {
                myMetricInstances.put(aClass.getName(), aClass.newInstance());
            } catch (InstantiationException e) {
                MetricInstanceHolder.LOGGER.error(e);
            } catch (IllegalAccessException e) {
                MetricInstanceHolder.LOGGER.error(e);
            }/* w  w  w .j  a v a  2 s.com*/
        }
    }

    for (Metric metric : Metric.EP_NAME.getExtensions()) {
        myMetricInstances.put(metric.getClass().getName(), metric);
    }

    // add some magic
    // in Profiles it stored by ClassName. Line Of code is can be handle without new metrics, need only extends  LinesOfCodeProjectMetric with
    // new name
    for (LineOfCodeFileTypeProviderEP ep : LineOfCodeFileTypeProviderEP.EP_NAME.getExtensions()) {
        FileType fileTypeByFileName = FileTypeRegistry.getInstance().findFileTypeByName(ep.fileType);

        if (fileTypeByFileName == null) {
            LOGGER.error("File type is unknown: " + ep.fileType);
            fileTypeByFileName = PlainTextFileType.INSTANCE;
        }
        String lineOfCodeClass = Type.getInternalName(LinesOfCodeProjectMetric.class);
        String className = lineOfCodeClass + "$" + ep.fileType;

        ClassWriter writer = new ClassWriter(Opcodes.F_FULL);
        writer.visit(Opcodes.V1_6, Opcodes.ACC_PUBLIC, className, null, lineOfCodeClass, null);

        String desc = Type.getConstructorDescriptor(LinesOfCodeProjectMetric.class.getConstructors()[0]);
        MethodVisitor methodVisitor = writer.visitMethod(Opcodes.ACC_PUBLIC, "<init>", desc, null, null);

        methodVisitor.visitMaxs(2, 2);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 1);
        methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, lineOfCodeClass, "<init>", desc);
        methodVisitor.visitInsn(Opcodes.RETURN);
        methodVisitor.visitEnd();
        writer.visitEnd();

        Class<?> aClass = defineClass(className.replace("/", "."), writer.toByteArray());

        try {
            myMetricInstances.put(aClass.getName(),
                    (Metric) aClass.getConstructors()[0].newInstance(fileTypeByFileName));
        } catch (InstantiationException e) {
            LOGGER.error(e);
        } catch (IllegalAccessException e) {
            LOGGER.error(e);
        } catch (InvocationTargetException e) {
            LOGGER.error(e);
        }
    }
}

From source file:com.sun.fortress.compiler.asmbytecodeoptimizer.Inlining.java

License:Open Source License

public static List<Insn> convertInsns(MethodInsn mi, List<Insn> insns, int[] args, int _index, Label end) {
    List<Insn> result = new ArrayList<Insn>();
    HashMap labels = new HashMap();
    int index = _index;
    for (Insn i : insns) {
        if (i.isExpanded()) {
            MethodInsn expanded = (MethodInsn) i;
            // This use of end should be OK because all returns should have been removed when inlined before.
            // What could go wrong?
            result.addAll(convertInsns(expanded, expanded.inlineExpansionInsns, args, _index, end));
        } else if (i instanceof SingleInsn) {
            SingleInsn si = (SingleInsn) i;
            switch (si.opcode) {
            case Opcodes.IRETURN:
            case Opcodes.LRETURN:
            case Opcodes.FRETURN:
            case Opcodes.DRETURN:
            case Opcodes.ARETURN:
            case Opcodes.RETURN:
                result.add(new JumpInsn("RETURN->GOTO", Opcodes.GOTO, end, newIndex(mi, index++)));
                break;
            default:
                result.add(i.copy(newIndex(mi, index++)));
            }/*  w  ww . j ava  2  s .c  om*/
        } else if (i instanceof VarInsn) {
            VarInsn vi = (VarInsn) i;
            switch (vi.opcode) {
            case Opcodes.ILOAD:
            case Opcodes.LLOAD:
            case Opcodes.FLOAD:
            case Opcodes.DLOAD:
            case Opcodes.ALOAD:
            case Opcodes.ISTORE:
            case Opcodes.LSTORE:
            case Opcodes.FSTORE:
            case Opcodes.DSTORE:
            case Opcodes.ASTORE:
                VarInsn newVarInsn = new VarInsn(vi.name, vi.opcode, args[vi.var], newIndex(mi, index++));
                result.add(newVarInsn);
                break;
            default:
                result.add(i.copy(newIndex(mi, index++)));
            }
        } else if (i instanceof VisitMaxs) {
        } else if (i instanceof VisitEnd) {
        } else if (i instanceof VisitCode) {
        } else if (i instanceof VisitFrame) {
        } else if (i instanceof LabelInsn) {
            LabelInsn li = (LabelInsn) i;
            if (labels.containsKey(li.label))
                result.add(new LabelInsn(li.name, (Label) labels.get(li.label), newIndex(mi, index++)));
            else {
                Label l = new Label();
                labels.put(li.label, l);
                result.add(new LabelInsn(li.name, l, newIndex(mi, index++)));
            }
        } else if (i instanceof JumpInsn) {
            JumpInsn ji = (JumpInsn) i;
            if (labels.containsKey(ji.label))
                result.add(
                        new JumpInsn(ji.name, ji.opcode, (Label) labels.get(ji.label), newIndex(mi, index++)));
            else {
                Label l = new Label();
                labels.put(ji.label, l);
                result.add(new JumpInsn(ji.name, ji.opcode, l, newIndex(mi, index++)));
            }
        } else if (i instanceof VisitLineNumberInsn) {
            VisitLineNumberInsn vlni = (VisitLineNumberInsn) i;
            if (labels.containsKey(vlni.start))
                result.add(new VisitLineNumberInsn(vlni.name, vlni.line, (Label) labels.get(vlni.start),
                        newIndex(mi, index++)));
            else {
                Label l = new Label();
                labels.put(vlni.start, l);
                result.add(new VisitLineNumberInsn(vlni.name, vlni.line, l, newIndex(mi, index++)));
            }
        } else if (i instanceof LocalVariableInsn) {
            LocalVariableInsn lvi = (LocalVariableInsn) i;
            if (labels.containsKey(lvi.start) && labels.containsKey(lvi.end)) {
                result.add(new LocalVariableInsn(lvi.name, lvi._name, lvi.desc, lvi.sig,
                        (Label) labels.get(lvi.start), (Label) labels.get(lvi.end), args[lvi._index],
                        newIndex(mi, index++)));
            } else
                throw new RuntimeException("NYI");
        } else if (i instanceof TryCatchBlock) {
            TryCatchBlock tcb = (TryCatchBlock) i;
            if (labels.containsKey(tcb.start) && labels.containsKey(tcb.end)
                    && labels.containsKey(tcb.handler)) {
                result.add(
                        new TryCatchBlock(tcb.name, (Label) labels.get(tcb.start), (Label) labels.get(tcb.end),
                                (Label) labels.get(tcb.handler), tcb.type, newIndex(mi, index++)));
            } else if (!labels.containsKey(tcb.start) && !labels.containsKey(tcb.end)
                    && !labels.containsKey(tcb.handler)) {
                Label s = new Label();
                Label e = new Label();
                Label h = new Label();
                labels.put(tcb.start, s);
                labels.put(tcb.end, e);
                labels.put(tcb.handler, h);
                result.add(new TryCatchBlock(tcb.name, s, e, h, tcb.type, newIndex(mi, index++)));
            } else
                throw new RuntimeException("NYI");
            // Need to add TableSwitch, LookupSwitch
        } else {
            result.add(i.copy(newIndex(mi, index++)));
        }
    }
    return result;
}

From source file:com.sun.fortress.compiler.environments.TopLevelEnvGen.java

License:Open Source License

/**
 * Generate the default constructor for this class.
 * This constructors calls the method setToplevel().
 * If this environment is not a top-level environment, then a default
 * constructor does not need to be created.  (ASM will generate a
 * default constructor)./*  www .j a v  a  2 s  . co  m*/
 */
private static void writeMethodInit(ClassWriter cw, String className) {
    MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
    mv.visitCode();
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getType(BaseEnv.class).getInternalName(), "<init>", "()V");
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, className, "setTopLevel", "()V");
    mv.visitInsn(Opcodes.RETURN);
    // See comment above on ClassWriter.COMPUTE_FRAMES
    mv.visitMaxs(1, 1);
    mv.visitEnd();
}