Example usage for org.objectweb.asm MethodVisitor visitCode

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

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Introduction

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

Prototype

public void visitCode()

Source Link

Document

Starts the visit of the method's code, if any (i.e.

Usage

From source file:erjang.ETuple.java

License:Apache License

private static void create_cast2(ClassAdapter cw, int n) {
    MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC, "cast",
            "(L" + Type.getInternalName(EObject.class) + ";)L" + ETUPLE_NAME + n + ";", null, null);
    mv.visitCode();

    mv.visitVarInsn(Opcodes.ALOAD, 0);/*from   ww  w .j a v a 2 s .  c o  m*/
    mv.visitInsn(Opcodes.DUP);
    mv.visitTypeInsn(Opcodes.INSTANCEOF, ETUPLE_NAME + n);

    Label fail = new Label();

    mv.visitJumpInsn(Opcodes.IFEQ, fail);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitTypeInsn(Opcodes.CHECKCAST, ETUPLE_NAME + n);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitLabel(fail);
    mv.visitInsn(Opcodes.ACONST_NULL);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitMaxs(2, 2);
    mv.visitEnd();
}

From source file:erjang.ETuple.java

License:Apache License

private static void create_constructor(ClassAdapter cw, String super_class_name) {
    MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
    mv.visitCode();
    mv.visitVarInsn(Opcodes.ALOAD, 0); // load this
    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, super_class_name, "<init>", "()V");
    mv.visitInsn(Opcodes.RETURN);/* w w w .j av  a  2s . c  om*/
    mv.visitMaxs(1, 1);
    mv.visitEnd();
}

From source file:formatasm.FormatASM.java

License:Open Source License

public static byte[] generateBytes(String klazz, String subklazz, List<Spec> specs) {
    klazz = klazz.replace('.', '/');
    subklazz = subklazz.replace('.', '/');

    ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
    MethodVisitor mv;

    cw.visit(V1_7, ACC_PUBLIC + ACC_SUPER, subklazz, null, klazz, null);

    {/* w w w. j a v a  2  s .  co  m*/
        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, klazz, "<init>", "()V");
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

    {
        mv = cw.visitMethod(ACC_PUBLIC + ACC_VARARGS, "format", "([Ljava/lang/Object;)Ljava/lang/String;", null,
                null);

        /// StringBuilder sb = new StringBuilder();
        mv.visitCode();
        mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
        mv.visitInsn(DUP);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "()V");
        mv.visitVarInsn(ASTORE, 2);

        for (Spec spec : specs) {
            switch (spec.type) {
            case CONTENT:
                copyTemplateASM(klazz, mv, spec.begin, spec.end);
                // Skip further processing
                continue;

            case PERCENT:
                mv.visitVarInsn(ALOAD, 2);
                mv.visitIntInsn(BIPUSH, '%');
                mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
                        "(C)Ljava/lang/StringBuilder;");
                mv.visitInsn(POP);
                // Skip further processing
                continue;

            case INT:
                formatIntegerASM(mv, spec);
                break;

            case INT_HEX:
                formatHexidecimalASM(mv, spec);
                break;

            case OCTAL:
                formatOctalASM(mv, spec);
                break;

            case BOOL:
            case CHAR:
                // text = args[?].toString();
                mv.visitVarInsn(ALOAD, 1);
                mv.visitIntInsn(BIPUSH, spec.index);
                mv.visitInsn(AALOAD);
                mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "toString", "()Ljava/lang/String;");
                mv.visitVarInsn(ASTORE, 3);
                break;

            case STRING:
                // text = (String) args[?]
                mv.visitVarInsn(ALOAD, 1);
                mv.visitIntInsn(BIPUSH, spec.index);
                mv.visitInsn(AALOAD);
                mv.visitTypeInsn(CHECKCAST, "java/lang/String");
                mv.visitVarInsn(ASTORE, 3);
                break;

            case DATETIME:
                formatDateTimeASM(mv, spec);
                break;

            default:
                break;
            }

            if (spec.upper && spec.type != Type.DATETIME) {
                toUpperCaseASM(mv);
            }

            if (spec.width > 0 && !spec.leftFlag) {
                addWidthASM(mv, spec);
            }

            appendTextASM(mv);

            if (spec.width > 0 && spec.leftFlag) {
                addWidthASM(mv, spec);
            }
        }

        /// return sb.toString();
        mv.visitVarInsn(ALOAD, 2);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;");
        mv.visitInsn(ARETURN);

        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }
    cw.visitEnd();

    return cw.toByteArray();
}

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeGenerationGoloIrVisitor.java

License:Apache License

private void writeModuleState(LocalReference moduleState) {
    String name = moduleState.getName();
    classWriter.visitField(ACC_PRIVATE | ACC_STATIC, name, "Ljava/lang/Object;", null, null).visitEnd();

    MethodVisitor mv = classWriter.visitMethod(ACC_PRIVATE | ACC_STATIC | ACC_SYNTHETIC, name,
            "()Ljava/lang/Object;", null, null);
    mv.visitCode();
    mv.visitFieldInsn(GETSTATIC, jvmKlass, name, "Ljava/lang/Object;");
    mv.visitInsn(ARETURN);/*from   w  w w.j  a v  a2  s. c  o  m*/
    mv.visitMaxs(0, 0);
    mv.visitEnd();

    mv = classWriter.visitMethod(ACC_PRIVATE | ACC_STATIC | ACC_SYNTHETIC, name, "(Ljava/lang/Object;)V", null,
            null);
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(PUTSTATIC, jvmKlass, name, "Ljava/lang/Object;");
    mv.visitInsn(RETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
}

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeStructGenerator.java

License:Apache License

private void makeSetMethod(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "set",
            "(Ljava/lang/String;Ljava/lang/Object;)Lgololang/GoloStruct;", null, null);
    visitor.visitCode();
    insertPrivateElementCheck(struct, visitor);
    Label nextCase = new Label();
    for (String member : struct.getMembers()) {
        visitor.visitLdcInsn(member);//ww w.  ja  v a 2 s. c  o m
        visitor.visitVarInsn(ALOAD, 1);
        visitor.visitJumpInsn(IF_ACMPNE, nextCase);
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitVarInsn(ALOAD, 2);
        visitor.visitMethodInsn(INVOKEVIRTUAL, owner, member, "(Ljava/lang/Object;)Lgololang/GoloStruct;");
        visitor.visitInsn(ARETURN);
        visitor.visitLabel(nextCase);
        nextCase = new Label();
    }
    insertUnknowElementCode(struct, visitor);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeStructGenerator.java

License:Apache License

private void makeGetMethod(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "get", "(Ljava/lang/String;)Ljava/lang/Object;",
            null, null);/* w  w  w  .j a  v  a  2  s.  c  om*/
    visitor.visitCode();
    insertPrivateElementCheck(struct, visitor);
    Label nextCase = new Label();
    for (String member : struct.getMembers()) {
        visitor.visitLdcInsn(member);
        visitor.visitVarInsn(ALOAD, 1);
        visitor.visitJumpInsn(IF_ACMPNE, nextCase);
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitMethodInsn(INVOKEVIRTUAL, owner, member, "()Ljava/lang/Object;");
        visitor.visitInsn(ARETURN);
        visitor.visitLabel(nextCase);
        nextCase = new Label();
    }
    insertUnknowElementCode(struct, visitor);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeStructGenerator.java

License:Apache License

private void makeValuesMethod(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "values", "()Lgololang/Tuple;", null, null);
    visitor.visitCode();
    loadInteger(visitor, struct.getPublicMembers().size());
    visitor.visitTypeInsn(ANEWARRAY, "java/lang/Object");
    int index = 0;
    for (String member : struct.getPublicMembers()) {
        visitor.visitInsn(DUP);//from  w w  w.  j  a va2  s  .  c  om
        loadInteger(visitor, index);
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitFieldInsn(GETFIELD, owner, member, "Ljava/lang/Object;");
        visitor.visitInsn(AASTORE);
        index = index + 1;
    }
    visitor.visitMethodInsn(INVOKESTATIC, "gololang/Tuple", "fromArray",
            "([Ljava/lang/Object;)Lgololang/Tuple;");
    visitor.visitInsn(ARETURN);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeStructGenerator.java

License:Apache License

private void makeEquals(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "equals", "(Ljava/lang/Object;)Z", null, null);
    Label notFrozenLabel = new Label();
    Label falseLabel = new Label();
    Label sameTypeLabel = new Label();
    visitor.visitCode();
    visitor.visitVarInsn(ALOAD, 0);/*from  w  ww .j a  v a2  s  . c  o m*/
    visitor.visitFieldInsn(GETFIELD, owner, $_frozen, "Z");
    visitor.visitJumpInsn(IFNE, notFrozenLabel);
    // super.equals()
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitVarInsn(ALOAD, 1);
    visitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "equals", "(Ljava/lang/Object;)Z");
    visitor.visitInsn(IRETURN);
    // The receiver is frozen
    visitor.visitLabel(notFrozenLabel);
    visitor.visitVarInsn(ALOAD, 1);
    visitor.visitTypeInsn(INSTANCEOF, owner);
    visitor.visitJumpInsn(IFNE, sameTypeLabel);
    visitor.visitJumpInsn(GOTO, falseLabel);
    // The argument is of the same type, too
    visitor.visitLabel(sameTypeLabel);
    visitor.visitVarInsn(ALOAD, 1);
    visitor.visitTypeInsn(CHECKCAST, owner);
    visitor.visitFieldInsn(GETFIELD, owner, $_frozen, "Z");
    visitor.visitJumpInsn(IFEQ, falseLabel);
    // The argument is not frozen
    for (String member : struct.getMembers()) {
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitFieldInsn(GETFIELD, owner, member, "Ljava/lang/Object;");
        visitor.visitVarInsn(ALOAD, 1);
        visitor.visitTypeInsn(CHECKCAST, owner);
        visitor.visitFieldInsn(GETFIELD, owner, member, "Ljava/lang/Object;");
        visitor.visitMethodInsn(INVOKESTATIC, "java/util/Objects", "equals",
                "(Ljava/lang/Object;Ljava/lang/Object;)Z");
        visitor.visitJumpInsn(IFEQ, falseLabel);
    }
    visitor.visitInsn(ICONST_1);
    visitor.visitInsn(IRETURN);
    // False
    visitor.visitLabel(falseLabel);
    visitor.visitInsn(ICONST_0);
    visitor.visitInsn(IRETURN);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeStructGenerator.java

License:Apache License

private void makeHashCode(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "hashCode", "()I", null, null);
    Label notFrozenLabel = new Label();
    visitor.visitCode();
    visitor.visitVarInsn(ALOAD, 0);/*w w w  . j  a va  2 s . com*/
    visitor.visitFieldInsn(GETFIELD, owner, $_frozen, "Z");
    visitor.visitJumpInsn(IFNE, notFrozenLabel);
    // super.hashCode()
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "hashCode", "()I");
    visitor.visitInsn(IRETURN);
    // The receiver is frozen
    visitor.visitLabel(notFrozenLabel);
    loadInteger(visitor, struct.getMembers().size());
    visitor.visitTypeInsn(ANEWARRAY, "java/lang/Object");
    int i = 0;
    for (String member : struct.getMembers()) {
        visitor.visitInsn(DUP);
        loadInteger(visitor, i);
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitFieldInsn(GETFIELD, owner, member, "Ljava/lang/Object;");
        visitor.visitInsn(AASTORE);
        i = i + 1;
    }
    visitor.visitMethodInsn(INVOKESTATIC, "java/util/Objects", "hash", "([Ljava/lang/Object;)I");
    visitor.visitInsn(IRETURN);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeStructGenerator.java

License:Apache License

private void makeCopy(ClassWriter classWriter, Struct struct, boolean frozen) {
    String owner = struct.getPackageAndClass().toJVMType();
    String methodName = frozen ? "frozenCopy" : "copy";
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, methodName, "()Lgololang/GoloStruct;", null,
            null);/*from w  ww .  jav  a2s . co  m*/
    visitor.visitCode();
    visitor.visitTypeInsn(NEW, owner);
    visitor.visitInsn(DUP);
    for (String member : struct.getMembers()) {
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitFieldInsn(GETFIELD, owner, member, "Ljava/lang/Object;");
    }
    visitor.visitMethodInsn(INVOKESPECIAL, owner, "<init>", allArgsConstructorSignature(struct));
    visitor.visitInsn(DUP);
    visitor.visitInsn(frozen ? ICONST_1 : ICONST_0);
    visitor.visitFieldInsn(PUTFIELD, owner, $_frozen, "Z");
    visitor.visitInsn(ARETURN);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}