Example usage for org.objectweb.asm MethodVisitor visitVarInsn

List of usage examples for org.objectweb.asm MethodVisitor visitVarInsn

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Introduction

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

Prototype

public void visitVarInsn(final int opcode, final int var)

Source Link

Document

Visits a local variable instruction.

Usage

From source file:com.android.build.gradle.integration.packaging.NativeSoPackagingFromJarTest.java

License:Apache License

/**
 * Creates a class and returns the byte[] with the class
 * @return/*from  w w w .j  ava 2  s  .c o m*/
 */
private static byte[] getDummyClassByteCode() {
    ClassWriter cw = new ClassWriter(0);
    FieldVisitor fv;
    MethodVisitor mv;
    AnnotationVisitor av0;

    cw.visit(Opcodes.V1_6, Opcodes.ACC_PUBLIC + Opcodes.ACC_SUPER, "com/foo/Foo", null, "java/lang/Object",
            null);

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

    mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "aaa", "()V", null, null);
    mv.visitCode();
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "test/Aaa", "bbb", "()V", false);
    mv.visitInsn(Opcodes.RETURN);
    mv.visitMaxs(1, 1);
    mv.visitEnd();

    mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "bbb", "()V", null, null);
    mv.visitCode();
    mv.visitInsn(Opcodes.RETURN);
    mv.visitMaxs(0, 1);
    mv.visitEnd();

    mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "ccc", "()V", null, null);
    mv.visitCode();
    mv.visitInsn(Opcodes.RETURN);
    mv.visitMaxs(0, 1);
    mv.visitEnd();

    cw.visitEnd();

    return cw.toByteArray();
}

From source file:com.android.build.gradle.internal.incremental.IncrementalChangeVisitor.java

License:Apache License

/**
 * Turns this class into an override class that can be loaded by our custom class loader:
 *<ul>/* w w w .  j a v a2  s  .c  o  m*/
 *   <li>Make the class name be OriginalName$override</li>
 *   <li>Ensure the class derives from java.lang.Object, no other inheritance</li>
 *   <li>Ensure the class has a public parameterless constructor that is a noop.</li>
 *</ul>
 */
@Override
public void visit(int version, int access, String name, String signature, String superName,
        String[] interfaces) {
    super.visit(version, Opcodes.ACC_PUBLIC | Opcodes.ACC_SUPER, name + OVERRIDE_SUFFIX, signature,
            "java/lang/Object", new String[] { CHANGE_TYPE.getInternalName() });

    if (DEBUG) {
        System.out.println(">>>>>>>> Processing " + name + "<<<<<<<<<<<<<");
    }

    visitedClassName = name;
    visitedSuperName = superName;
    instanceToStaticDescPrefix = "(L" + visitedClassName + ";";

    // Create empty constructor
    MethodVisitor mv = super.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
    mv.visitCode();
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
    mv.visitInsn(Opcodes.RETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();

    super.visitField(Opcodes.ACC_PUBLIC | Opcodes.ACC_SYNTHETIC | Opcodes.ACC_STATIC, "$obsolete", "Z", null,
            null);
}

From source file:com.android.build.gradle.internal.transforms.InstantRunTransform.java

License:Apache License

/**
 * Use asm to generate a concrete subclass of the AppPathLoaderImpl class.
 * It only implements one method :/*from  w  ww.j  a  v a 2 s.  c o  m*/
 *      String[] getPatchedClasses();
 *
 * The method is supposed to return the list of classes that were patched in this iteration.
 * This will be used by the InstantRun runtime to load all patched classes and register them
 * as overrides on the original classes.2 class files.
 *
 * @param patchFileContents list of patched class names.
 * @param outputDir output directory where to generate the .class file in.
 */
private static void writePatchFileContents(@NonNull ImmutableList<String> patchFileContents,
        @NonNull File outputDir, long buildId) {

    ClassWriter cw = new ClassWriter(0);
    MethodVisitor mv;

    cw.visit(Opcodes.V1_6, Opcodes.ACC_PUBLIC + Opcodes.ACC_SUPER, IncrementalVisitor.APP_PATCHES_LOADER_IMPL,
            null, IncrementalVisitor.ABSTRACT_PATCHES_LOADER_IMPL, null);

    // Add the build ID to force the patch file to be repackaged.
    cw.visitField(Opcodes.ACC_PUBLIC + Opcodes.ACC_STATIC + Opcodes.ACC_FINAL, "BUILD_ID", "J", null, buildId);

    {
        mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitMethodInsn(Opcodes.INVOKESPECIAL, IncrementalVisitor.ABSTRACT_PATCHES_LOADER_IMPL, "<init>",
                "()V", false);
        mv.visitInsn(Opcodes.RETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "getPatchedClasses", "()[Ljava/lang/String;", null, null);
        mv.visitCode();
        mv.visitIntInsn(Opcodes.BIPUSH, patchFileContents.size());
        mv.visitTypeInsn(Opcodes.ANEWARRAY, "java/lang/String");
        for (int index = 0; index < patchFileContents.size(); index++) {
            mv.visitInsn(Opcodes.DUP);
            mv.visitIntInsn(Opcodes.BIPUSH, index);
            mv.visitLdcInsn(patchFileContents.get(index));
            mv.visitInsn(Opcodes.AASTORE);
        }
        mv.visitInsn(Opcodes.ARETURN);
        mv.visitMaxs(4, 1);
        mv.visitEnd();
    }
    cw.visitEnd();

    byte[] classBytes = cw.toByteArray();
    File outputFile = new File(outputDir, IncrementalVisitor.APP_PATCHES_LOADER_IMPL + ".class");
    try {
        Files.createParentDirs(outputFile);
        Files.write(classBytes, outputFile);
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}

From source file:com.android.build.gradle.internal2.incremental.IncrementalChangeVisitor.java

License:Apache License

/**
 * Turns this class into an override class that can be loaded by our custom class loader:
 *<ul>/*from w  ww. j a v  a2 s .  co  m*/
 *   <li>Make the class name be OriginalName$override</li>
 *   <li>Ensure the class derives from java.lang.Object, no other inheritance</li>
 *   <li>Ensure the class has a public parameterless constructor that is a noop.</li>
 *</ul>
 */
@Override
public void visit(int version, int access, String name, String signature, String superName,
        String[] interfaces) {
    // TODO: modified by achellies, ?,??,?ClassClass,Opcodes.INVOKESPECIAL?super
    super.visit(version, Opcodes.ACC_PUBLIC | Opcodes.ACC_SUPER, name + OVERRIDE_SUFFIX, signature, superName, // TODO modified by achellies, "java/lang/Object" -> superName
            new String[] { CHANGE_TYPE.getInternalName() });

    if (DEBUG) {
        System.out.println(">>>>>>>> Processing " + name + "<<<<<<<<<<<<<");
    }

    visitedClassName = name;
    visitedSuperName = superName;
    instanceToStaticDescPrefix = "(L" + visitedClassName + ";";

    // Create empty constructor
    MethodVisitor mv = super.visitMethod(Opcodes.ACC_PUBLIC, ByteCodeUtils.CONSTRUCTOR, "()V", null, null);
    mv.visitCode();
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, superName, ByteCodeUtils.CONSTRUCTOR, "()V", // TODO modified by achellies, "java/lang/Object" -> superName
            false);
    mv.visitInsn(Opcodes.RETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();

    super.visitField(Opcodes.ACC_PUBLIC | Opcodes.ACC_SYNTHETIC | Opcodes.ACC_STATIC, "$obsolete", "Z", null,
            null);
}

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;/*from  w  w w  . j  a va 2s  .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.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   www.j a  va2 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 ww w  .ja v a  2s .  c  om*/
    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;/*w ww . j  a va  2 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  .  ja  v a  2  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.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  ww w.ja v  a 2s  .  c  o m*/
    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();
}