Example usage for org.objectweb.asm MethodVisitor visitLdcInsn

Introduction

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

Prototype

public void visitLdcInsn(final Object value)

Source Link

Document

Visits a LDC instruction.

Usage

From source file:com.cinnober.msgcodec.blink.NativeByteCodeGenerator.java

License:Open Source License

/**
 * Generate value decoding using the blink input.
 *
 * <p>Defaults to <code>readBinary[Null].</code>
 *
 * @param required true if the field is required, otherwise false.
 * @param mv the method visitor, not null.
 * @see #generateDecodeValue/*w  w  w. ja va 2s.c  o m*/
 */
@Override
protected void generateDecodeBinaryValue(TypeDef.Binary type, MethodVisitor mv, boolean required) {
    if (Integer.compareUnsigned(type.getMaxSize(), 255) <= 0) {
        // inline
        mv.visitLdcInsn(type.getMaxSize());
        if (required) {
            mv.visitMethodInsn(INVOKESTATIC, blinkInputIName, "readBinary",
                    "(Lcom/cinnober/msgcodec/io/ByteSource;I)[B", false);
        } else {
            mv.visitMethodInsn(INVOKESTATIC, blinkInputIName, "readBinaryNull",
                    "(Lcom/cinnober/msgcodec/io/ByteSource;I)[B", false);
        }
    } else {
        // data area
        throw new UnsupportedOperationException("Not implemented yet"); // TODO: add support for data area
    }
}

From source file:com.cinnober.msgcodec.blink.NativeByteCodeGenerator.java

License:Open Source License

/**
 * Generate value decoding using the blink input.
 *
 * <p>Defaults to <code>readStringUTF8[Null].</code>
 *
 * @param required true if the field is required, otherwise false.
 * @param mv the method visitor, not null.
 * @see #generateDecodeValue//  w ww. ja v  a 2s.  c o  m
 */
@Override
protected void generateDecodeStringValue(TypeDef.StringUnicode type, MethodVisitor mv, boolean required) {
    if (Integer.compareUnsigned(type.getMaxSize(), 255) <= 0) {
        // inline
        mv.visitLdcInsn(type.getMaxSize());
        if (required) {
            mv.visitMethodInsn(INVOKESTATIC, blinkInputIName, "readInlineStringUTF8",
                    "(Lcom/cinnober/msgcodec/io/ByteSource;I)Ljava/lang/String;", false);
        } else {
            mv.visitMethodInsn(INVOKESTATIC, blinkInputIName, "readInlineStringUTF8Null",
                    "(Lcom/cinnober/msgcodec/io/ByteSource;I)Ljava/lang/String;", false);
        }
    } else {
        // data area
        throw new UnsupportedOperationException("Not implemented yet"); // TODO: add support for data area
    }
}

From source file:com.e2info.helloasm.HelloAsmApp.java

License:Open Source License

public static void main(String[] args) throws IOException {
    String name = "HelloAsm";
    int flag = ClassWriter.COMPUTE_MAXS;
    ClassWriter cw = new ClassWriter(flag);
    cw.visit(Opcodes.V1_5, Opcodes.ACC_PUBLIC + Opcodes.ACC_SUPER, name, null, "java/lang/Object", null);

    cw.visitSource(name + ".java", null);

    {//  w w  w  .  j av  a2  s. c o m
        MethodVisitor mv;
        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");
        mv.visitInsn(Opcodes.RETURN);
        // we need this call to take effect ClassWriter.COMPUTE_MAXS flag.
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

    {
        MethodVisitor mv;
        mv = cw.visitMethod(Opcodes.ACC_PUBLIC + Opcodes.ACC_STATIC, "main", "([Ljava/lang/String;)V", null,
                null);
        mv.visitCode();
        mv.visitFieldInsn(Opcodes.GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
        mv.visitLdcInsn("hello ASM");
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V");
        mv.visitInsn(Opcodes.RETURN);
        // we need this call to take effect ClassWriter.COMPUTE_MAXS flag.
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

    cw.visitEnd();

    // build binary
    byte[] bin = cw.toByteArray();

    // save asm trace for human readable
    {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        new ClassReader(bin).accept(new TraceClassVisitor(pw), 0);
        File f = new File(name + ".txt");
        FileUtils.writeStringToFile(f, sw.toString());
    }

    // save as calss file
    {
        File f = new File(name + ".class");
        FileUtils.writeByteArrayToFile(f, bin);
    }

}

From source file:com.enea.jcarder.agent.instrument.InstrumentationUtilities.java

License:GNU General Public License

public static void pushClassReferenceToStack(MethodVisitor mv, String className) {
    /*/*from  w ww . java2 s  . c o m*/
     * It is not possible to use:
     *
     *     mv.visitLdcInsn(RuleType.getType(mClassName));
     *
     * for class versions before 49.0 (introduced with java 1.5). Therefore
     * we use Class.forName instead.
     *
     * TODO It might be possible to do this more efficiently by caching the
     * result from Class.forName. But note that adding a new field (where
     * the cached class object can be stored) is only possible if the class
     * has not already been loaded by the JVM.
     */
    mv.visitLdcInsn(className);
    mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Class", "forName",
            "(Ljava/lang/String;)Ljava/lang/Class;");
}

From source file:com.gargoylesoftware.js.nashorn.internal.codegen.types.BooleanType.java

License:Open Source License

@Override
public Type loadUndefined(final MethodVisitor method) {
    method.visitLdcInsn(UNDEFINED_INT);
    return BOOLEAN;
}

From source file:com.gargoylesoftware.js.nashorn.internal.codegen.types.IntType.java

License:Open Source License

@Override
public Type ldc(final MethodVisitor method, final Object c) {
    assert c instanceof Integer;

    final int value = ((Integer) c);

    switch (value) {
    case -1://www. jav a2s.co m
        method.visitInsn(ICONST_M1);
        break;
    case 0:
        method.visitInsn(ICONST_0);
        break;
    case 1:
        method.visitInsn(ICONST_1);
        break;
    case 2:
        method.visitInsn(ICONST_2);
        break;
    case 3:
        method.visitInsn(ICONST_3);
        break;
    case 4:
        method.visitInsn(ICONST_4);
        break;
    case 5:
        method.visitInsn(ICONST_5);
        break;
    default:
        if (value == (byte) value) {
            method.visitIntInsn(BIPUSH, value);
        } else if (value == (short) value) {
            method.visitIntInsn(SIPUSH, value);
        } else {
            method.visitLdcInsn(c);
        }
        break;
    }

    return Type.INT;
}

From source file:com.gargoylesoftware.js.nashorn.internal.codegen.types.IntType.java

License:Open Source License

@Override
public Type loadUndefined(final MethodVisitor method) {
    method.visitLdcInsn(UNDEFINED_INT);
    return INT;
}

From source file:com.gargoylesoftware.js.nashorn.internal.codegen.types.LongType.java

License:Open Source License

@Override
public Type ldc(final MethodVisitor method, final Object c) {
    assert c instanceof Long;

    final long value = (Long) c;

    if (value == 0L) {
        method.visitInsn(LCONST_0);/*  w  w  w .  j a  va2s  . c  o  m*/
    } else if (value == 1L) {
        method.visitInsn(LCONST_1);
    } else {
        method.visitLdcInsn(c);
    }

    return Type.LONG;
}

From source file:com.gargoylesoftware.js.nashorn.internal.codegen.types.LongType.java

License:Open Source License

@Override
public Type loadUndefined(final MethodVisitor method) {
    method.visitLdcInsn(UNDEFINED_LONG);
    return LONG;
}

From source file:com.gargoylesoftware.js.nashorn.internal.codegen.types.NumberType.java

License:Open Source License

@Override
public Type loadUndefined(final MethodVisitor method) {
    method.visitLdcInsn(UNDEFINED_DOUBLE);
    return NUMBER;
}