Example usage for org.objectweb.asm MethodVisitor visitInsn

Introduction

In this page you can find the example usage for org.objectweb.asm MethodVisitor visitInsn.

Prototype

public void visitInsn(final int opcode) 

Source Link

Document

Visits a zero operand instruction.

Usage

From source file:com.android.build.gradle.shrinker.TestClasses.java

License:Apache License

static byte[] emptyClass(String name) throws Exception {

    ClassWriter cw = new ClassWriter(0);
    FieldVisitor fv;// ww w  .j  a v a2  s .  co m
    MethodVisitor mv;
    AnnotationVisitor av0;

    cw.visit(V1_6, ACC_PUBLIC + ACC_SUPER, "test/" + name, null, "java/lang/Object", null);

    {
        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
        mv.visitInsn(RETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    cw.visitEnd();

    return cw.toByteArray();
}

---

From source file:com.android.build.gradle.shrinker.TestClasses.java

License:Apache License

static byte[] classWithEmptyMethods(String className, String... namesAndDescriptors) throws Exception {

    ClassWriter cw = new ClassWriter(0);
    FieldVisitor fv;//from w  ww .  jav  a  2 s  .  co m
    MethodVisitor mv;
    AnnotationVisitor av0;

    cw.visit(V1_6, ACC_PUBLIC + ACC_SUPER, "test/" + className, null, "java/lang/Object", null);

    {
        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
        mv.visitInsn(RETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    for (String namesAndDescriptor : namesAndDescriptors) {
        int colon = namesAndDescriptor.indexOf(':');
        String methodName = namesAndDescriptor.substring(0, colon);
        String descriptor = namesAndDescriptor.substring(colon + 1, namesAndDescriptor.length());
        {
            mv = cw.visitMethod(ACC_PUBLIC, methodName, descriptor, null, null);
            mv.visitCode();
            // This bytecode is only valid for some signatures (void methods). This class is used
            // for testing the parser, we don't ever load these classes to a running VM anyway.
            mv.visitInsn(RETURN);
            mv.visitMaxs(0, 1);
            mv.visitEnd();
        }
    }
    cw.visitEnd();

    return cw.toByteArray();
}

---

From source file:com.android.build.gradle.tasks.fd.GenerateInstantRunAppInfoTask.java

License:Apache License

void writeAppInfoClass(@NonNull String applicationId, @Nullable String applicationClass, long token)
        throws IOException {
    ClassWriter cw = new ClassWriter(0);
    FieldVisitor fv;/*from   w w  w. j  a  v  a 2  s.  co  m*/
    MethodVisitor mv;

    String appInfoOwner = "com/android/tools/fd/runtime/AppInfo";
    cw.visit(V1_6, ACC_PUBLIC + ACC_SUPER, appInfoOwner, null, "java/lang/Object", null);

    fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, "applicationId", "Ljava/lang/String;", null, null);
    fv.visitEnd();
    fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, "applicationClass", "Ljava/lang/String;", null, null);
    fv.visitEnd();
    fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, "token", "J", null, null);
    fv.visitEnd();
    fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, "usingApkSplits", "Z", null, null);
    fv.visitEnd();
    mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
    mv.visitCode();
    Label l0 = new Label();
    mv.visitLabel(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", "L" + appInfoOwner + ";", null, l0, l1, 0);
    mv.visitMaxs(1, 1);
    mv.visitEnd();
    mv = cw.visitMethod(ACC_STATIC, "<clinit>", "()V", null, null);
    mv.visitCode();
    mv.visitLdcInsn(applicationId);
    mv.visitFieldInsn(PUTSTATIC, appInfoOwner, "applicationId", "Ljava/lang/String;");
    if (applicationClass != null) {
        mv.visitLdcInsn(applicationClass);
    } else {
        mv.visitInsn(ACONST_NULL);
    }
    mv.visitFieldInsn(PUTSTATIC, appInfoOwner, "applicationClass", "Ljava/lang/String;");
    if (token != 0L) {
        mv.visitLdcInsn(token);
    } else {
        mv.visitInsn(LCONST_0);
    }
    mv.visitFieldInsn(PUTSTATIC, appInfoOwner, "token", "J");
    if (isUsingMultiApks()) {
        mv.visitInsn(ICONST_1);
    } else {
        mv.visitInsn(ICONST_0);
    }
    mv.visitFieldInsn(PUTSTATIC, appInfoOwner, "usingApkSplits", "Z");

    mv.visitInsn(RETURN);
    mv.visitMaxs(2, 0);
    mv.visitEnd();
    cw.visitEnd();

    byte[] bytes = cw.toByteArray();

    try (JarOutputStream outputStream = new JarOutputStream(
            new BufferedOutputStream(new FileOutputStream(getOutputFile())))) {
        outputStream.putNextEntry(new ZipEntry("com/android/tools/fd/runtime/AppInfo.class"));
        outputStream.write(bytes);
        outputStream.closeEntry();
    }
}

---

From source file:com.android.build.gradle.tasks.ir.GenerateInstantRunAppInfoTask.java

License:Apache License

void writeAppInfoClass(@NonNull String applicationId, long token) throws IOException {
    ClassWriter cw = new ClassWriter(0);
    FieldVisitor fv;//from   w  ww .j  a va2 s .  c  om
    MethodVisitor mv;

    String appInfoOwner = SERVER_PACKAGE + "/AppInfo";
    cw.visit(V1_6, ACC_PUBLIC + ACC_SUPER, appInfoOwner, null, "java/lang/Object", null);

    fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, "applicationId", "Ljava/lang/String;", null, null);
    fv.visitEnd();
    fv = cw.visitField(ACC_PUBLIC + ACC_STATIC, "token", "J", null, null);
    fv.visitEnd();
    mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
    mv.visitCode();
    Label l0 = new Label();
    mv.visitLabel(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", "L" + appInfoOwner + ";", null, l0, l1, 0);
    mv.visitMaxs(1, 1);
    mv.visitEnd();
    mv = cw.visitMethod(ACC_STATIC, "<clinit>", "()V", null, null);
    mv.visitCode();
    mv.visitLdcInsn(applicationId);
    mv.visitFieldInsn(PUTSTATIC, appInfoOwner, "applicationId", "Ljava/lang/String;");
    if (token != 0L) {
        mv.visitLdcInsn(token);
    } else {
        mv.visitInsn(LCONST_0);
    }
    mv.visitFieldInsn(PUTSTATIC, appInfoOwner, "token", "J");

    mv.visitInsn(RETURN);
    mv.visitMaxs(2, 0);
    mv.visitEnd();
    cw.visitEnd();

    byte[] bytes = cw.toByteArray();

    try (JarOutputStream outputStream = new JarOutputStream(
            new BufferedOutputStream(new FileOutputStream(getOutputFile())))) {
        outputStream.putNextEntry(new ZipEntry(SERVER_PACKAGE + "/AppInfo.class"));
        outputStream.write(bytes);
        outputStream.closeEntry();
    }
}

---

From source file:com.android.builder.shrinker.TestClasses.java

License:Apache License

public static byte[] emptyClass(String name) throws Exception {

    ClassWriter cw = new ClassWriter(0);
    FieldVisitor fv;/*from   w w  w.  j a  va  2 s .com*/
    MethodVisitor mv;
    AnnotationVisitor av0;

    cw.visit(V1_6, ACC_PUBLIC + ACC_SUPER, "test/" + name, null, "java/lang/Object", null);

    {
        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
        mv.visitInsn(RETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    cw.visitEnd();

    return cw.toByteArray();
}

---

From source file:com.asakusafw.dag.compiler.builtin.BranchOperatorGenerator.java

License:Apache License

static void branch(MethodVisitor method, Context context, UserOperator operator, LocalVarRef input,
        Map<OperatorProperty, FieldRef> dependencies) {
    OperatorOutput[] outputs = outputs(context, operator);
    Label[] caseLabels = Stream.of(outputs).map(o -> new Label()).toArray(Label[]::new);
    Label defaultLabel = new Label();
    Label endLabel = new Label();

    method.visitMethodInsn(Opcodes.INVOKEVIRTUAL, typeOf(Enum.class).getInternalName(), "ordinal",
            Type.getMethodDescriptor(Type.INT_TYPE), false);
    method.visitTableSwitchInsn(0, caseLabels.length - 1, defaultLabel, caseLabels);

    for (int i = 0; i < outputs.length; i++) {
        method.visitLabel(caseLabels[i]);
        FieldRef ref = Invariants.requireNonNull(dependencies.get(outputs[i]));
        ref.load(method);/*from w w  w.  ja  v a 2 s . co  m*/
        input.load(method);
        invokeResultAdd(method);
        method.visitJumpInsn(Opcodes.GOTO, endLabel);
    }
    method.visitLabel(defaultLabel);
    getNew(method, Descriptions.typeOf(AssertionError.class));
    method.visitInsn(Opcodes.ATHROW);

    method.visitLabel(endLabel);
}

---

From source file:com.asakusafw.dag.compiler.builtin.FoldOperatorGenerator.java

License:Apache License

private ClassDescription generateCombinerClass(Context context, UserOperator operator, ClassDescription outer) {
    ClassDescription target = getCombinerName(outer);
    OperatorInput input = operator.getInput(0);

    ClassWriter writer = newWriter(target, Object.class, ObjectCombiner.class);
    writer.visitOuterClass(outer.getInternalName(), target.getInternalName(), null);

    FieldRef impl = defineOperatorField(writer, operator, target);
    defineEmptyConstructor(writer, Object.class, method -> {
        setOperatorField(method, operator, impl);
    });// w ww  .  ja  v  a 2  s .  co  m
    defineBuildKey(context, writer, input.getDataType(), input.getGroup());

    MethodVisitor method = writer.visitMethod(Opcodes.ACC_PUBLIC, "combine",
            Type.getMethodDescriptor(Type.VOID_TYPE, typeOf(Object.class), typeOf(Object.class)), null, null);

    List<ValueRef> arguments = new ArrayList<>();
    arguments.add(impl);
    arguments.add(m -> {
        m.visitVarInsn(Opcodes.ALOAD, 1);
        m.visitTypeInsn(Opcodes.CHECKCAST, typeOf(input.getDataType()).getInternalName());
    });
    arguments.add(m -> {
        m.visitVarInsn(Opcodes.ALOAD, 2);
        m.visitTypeInsn(Opcodes.CHECKCAST, typeOf(input.getDataType()).getInternalName());
    });
    for (VertexElement dep : context.getDependencies(operator.getArguments())) {
        Invariants.require(dep.getElementKind() == ElementKind.VALUE);
        ValueDescription value = ((ValueElement) dep).getValue();
        arguments.add(m -> {
            getConst(method, Invariants.safe(() -> value.resolve(context.getClassLoader())));
        });
    }
    invoke(method, context, operator, arguments);
    method.visitInsn(Opcodes.RETURN);
    method.visitMaxs(0, 0);
    method.visitEnd();
    return context.addClassFile(new ClassData(target, writer::toByteArray));
}

---

From source file:com.asakusafw.dag.compiler.builtin.FoldOperatorGenerator.java

License:Apache License

private void defineSimpleStart(UserOperator operator, ClassWriter writer, FieldRef acc) {
    MethodVisitor method = writer.visitMethod(Opcodes.ACC_PUBLIC, "start",
            Type.getMethodDescriptor(Type.VOID_TYPE, typeOf(Object.class)), null, null);

    TypeDescription dataType = operator.getInput(Fold.ID_INPUT).getDataType();

    acc.load(method);/*from   w  w  w. j  a  va 2 s. com*/
    method.visitVarInsn(Opcodes.ALOAD, 1);
    method.visitTypeInsn(Opcodes.CHECKCAST, typeOf(dataType).getInternalName());
    copyDataModel(method, dataType);

    method.visitInsn(Opcodes.RETURN);
    method.visitMaxs(0, 0);
    method.visitEnd();
}

---

From source file:com.asakusafw.dag.compiler.builtin.FoldOperatorGenerator.java

License:Apache License

private void defineSimpleCombine(Context context, UserOperator operator, ClassWriter writer, FieldRef impl,
        FieldRef acc, Map<OperatorProperty, FieldRef> map) {
    MethodVisitor method = writer.visitMethod(Opcodes.ACC_PUBLIC, "combine",
            Type.getMethodDescriptor(Type.VOID_TYPE, typeOf(Object.class)), null, null);

    TypeDescription dataType = operator.getInput(Fold.ID_INPUT).getDataType();
    LocalVarRef object = cast(method, 1, dataType);

    List<ValueRef> arguments = new ArrayList<>();
    arguments.add(impl);/*from  w  ww  . j a v  a 2s. co m*/
    arguments.add(acc);
    arguments.add(object);
    appendSecondaryInputs(arguments::add, operator, map::get);
    appendArguments(arguments::add, operator, map::get);
    invoke(method, context, operator, arguments);

    method.visitInsn(Opcodes.RETURN);
    method.visitMaxs(0, 0);
    method.visitEnd();
}

---

From source file:com.asakusafw.dag.compiler.builtin.FoldOperatorGenerator.java

License:Apache License

private void defineSimpleFinish(ClassWriter writer, FieldRef acc, ValueRef result) {
    MethodVisitor method = writer.visitMethod(Opcodes.ACC_PUBLIC, "finish",
            Type.getMethodDescriptor(typeOf(void.class)), null, null);

    result.load(method);/*  ww w. j a v a  2 s. c  o  m*/
    acc.load(method);
    invokeResultAdd(method);

    method.visitInsn(Opcodes.RETURN);
    method.visitMaxs(0, 0);
    method.visitEnd();
}

---

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