Java 类org.apache.bcel.generic.MULTIANEWARRAY 实例源码

/** Checks if the constraints of operands of the said instruction(s) are satisfied. */
public void visitMULTIANEWARRAY(MULTIANEWARRAY o){
    indexValid(o, o.getIndex());
    Constant c = cpg.getConstant(o.getIndex());
    if (!   (c instanceof ConstantClass)){
        constraintViolated(o, "Expecting a CONSTANT_Class operand, but found a '"+c+"'.");
    }
    int dimensions2create = o.getDimensions();
    if (dimensions2create < 1){
        constraintViolated(o, "Number of dimensions to create must be greater than zero.");
    }
    Type t = o.getType(cpg);
    if (t instanceof ArrayType){
        int dimensions = ((ArrayType) t).getDimensions();
        if (dimensions < dimensions2create){
            constraintViolated(o, "Not allowed to create array with more dimensions ('+dimensions2create+') than the one referenced by the CONSTANT_Class '"+t+"'.");
        }
    }
    else{
        constraintViolated(o, "Expecting a CONSTANT_Class referencing an array type. [Constraint not found in The Java Virtual Machine Specification, Second Edition, 4.8.1]");
    }
}

public void visitAllocationInstruction( AllocationInstruction i ) {
    Type type;
    if (i instanceof CPInstruction) {
        type = ((CPInstruction) i).getType(_cp);
    } else {
        type = ((NEWARRAY) i).getType();
    }
    short opcode = ((Instruction) i).getOpcode();
    int dim = 1;
    switch (opcode) {
        case Constants.NEW:
            _out.println("il.append(_factory.createNew(\"" + ((ObjectType) type).getClassName()
                    + "\"));");
            break;
        case Constants.MULTIANEWARRAY:
            dim = ((MULTIANEWARRAY) i).getDimensions();
        case Constants.ANEWARRAY:
        case Constants.NEWARRAY:
            if (type instanceof ArrayType) {
                type = ((ArrayType) type).getBasicType();
            }
            _out.println("il.append(_factory.createNewArray(" + BCELifier.printType(type)
                    + ", (short) " + dim + "));");
            break;
        default:
            throw new RuntimeException("Oops: " + opcode);
    }
}

/**
 * Checks that any store in this basic block to the specified variable is the
 * result of a new() or a null.
 * @param ih handle up to where to investigate.
 * @param localVarIndex the local variable index
 * @return true if all stores are OK or there are no stores.
 */
boolean noAliasesStoreWithIndexBefore(InstructionHandle ih, LocalVariableGen lg) {
    InstructionHandle prev = null;
    for (InstructionContext ic : instructions) {
        InstructionHandle current = ic.getInstruction();
        if (current.equals(ih)) {
            break;
        }

        if (methodGen.instructionStoresTo(current, lg.getIndex())) {
            LocalVariableGen l1 = methodGen.findLocalVar(current, lg.getIndex(), false);
            if (l1 != lg) {
                prev = current;
                continue;
            }
            if (prev != null) {
                Instruction i = prev.getInstruction();
                if (i instanceof INVOKESPECIAL) {
                    INVOKESPECIAL invoker = (INVOKESPECIAL) i;
                    if (invoker.getMethodName(methodGen.getConstantPool()).equals("<init>")
                        && isNonEscapingConstructor(invoker)) {
                        continue;
                    }
                }
                if (i instanceof CHECKCAST) {
                InstructionHandle pp = prev.getPrev();
                if (pp != null) {
                    i = pp.getInstruction();
                }
                }
                if (i instanceof NEWARRAY
                        || i instanceof ANEWARRAY || i instanceof MULTIANEWARRAY
                        || i instanceof ConstantPushInstruction || i instanceof ACONST_NULL) {
                     prev = current;
                     continue;
                }
            }
            return false;

        }
        prev = current;
    }
    return true;
}

private void emitMULTIANEWARRAY(Element xml_inst, MULTIANEWARRAY inst) {
    xml_inst.setAttribute("dimensions", "" + inst.getDimensions());
    xml_inst.setAttribute("base-type", inst.getType(cpg).toString().replace("[]", ""));
}

@Override
public void visitMULTIANEWARRAY(MULTIANEWARRAY obj) {
    modelNormalInstruction(obj, getNumWordsConsumed(obj), 0);
    produce(IsNullValue.nonNullValue());
}

@Override
public void visitMULTIANEWARRAY(MULTIANEWARRAY obj) {
    modelNormalInstruction(obj, getNumWordsConsumed(obj), 0);
    produce(IsNullValue.nonNullValue());
}