Examples with CstLiteralBits com.taobao.android.dx.rop.cst.CstLiteralBits used on opensource projects

Example 1 with CstLiteralBits

use of com.taobao.android.dx.rop.cst.CstLiteralBits in project atlas by alibaba.

the class BytecodeArray method parseNewarray.

/**
     * Helper to deal with {@code newarray}.
     *
     * @param offset the offset to the {@code newarray} opcode itself
     * @param visitor {@code non-null;} visitor to use
     * @return instruction length, in bytes
     */
private int parseNewarray(int offset, Visitor visitor) {
    int value = bytes.getUnsignedByte(offset + 1);
    CstType type;
    switch(value) {
        case ByteOps.NEWARRAY_BOOLEAN:
            {
                type = CstType.BOOLEAN_ARRAY;
                break;
            }
        case ByteOps.NEWARRAY_CHAR:
            {
                type = CstType.CHAR_ARRAY;
                break;
            }
        case ByteOps.NEWARRAY_DOUBLE:
            {
                type = CstType.DOUBLE_ARRAY;
                break;
            }
        case ByteOps.NEWARRAY_FLOAT:
            {
                type = CstType.FLOAT_ARRAY;
                break;
            }
        case ByteOps.NEWARRAY_BYTE:
            {
                type = CstType.BYTE_ARRAY;
                break;
            }
        case ByteOps.NEWARRAY_SHORT:
            {
                type = CstType.SHORT_ARRAY;
                break;
            }
        case ByteOps.NEWARRAY_INT:
            {
                type = CstType.INT_ARRAY;
                break;
            }
        case ByteOps.NEWARRAY_LONG:
            {
                type = CstType.LONG_ARRAY;
                break;
            }
        default:
            {
                throw new SimException("bad newarray code " + Hex.u1(value));
            }
    }
    // Revisit the previous bytecode to find out the length of the array
    int previousOffset = visitor.getPreviousOffset();
    ConstantParserVisitor constantVisitor = new ConstantParserVisitor();
    int arrayLength = 0;
    /*
         * For visitors that don't record the previous offset, -1 will be
         * seen here
         */
    if (previousOffset >= 0) {
        parseInstruction(previousOffset, constantVisitor);
        if (constantVisitor.cst instanceof CstInteger && constantVisitor.length + previousOffset == offset) {
            arrayLength = constantVisitor.value;
        }
    }
    /*
         * Try to match the array initialization idiom. For example, if the
         * subsequent code is initializing an int array, we are expecting the
         * following pattern repeatedly:
         *  dup
         *  push index
         *  push value
         *  *astore
         *
         * where the index value will be incrimented sequentially from 0 up.
         */
    int nInit = 0;
    int curOffset = offset + 2;
    int lastOffset = curOffset;
    ArrayList<Constant> initVals = new ArrayList<Constant>();
    if (arrayLength != 0) {
        while (true) {
            boolean punt = false;
            // First, check if the next bytecode is dup.
            int nextByte = bytes.getUnsignedByte(curOffset++);
            if (nextByte != ByteOps.DUP)
                break;
            /*
                 * Next, check if the expected array index is pushed to
                 * the stack.
                 */
            parseInstruction(curOffset, constantVisitor);
            if (constantVisitor.length == 0 || !(constantVisitor.cst instanceof CstInteger) || constantVisitor.value != nInit)
                break;
            // Next, fetch the init value and record it.
            curOffset += constantVisitor.length;
            /*
                 * Next, find out what kind of constant is pushed onto
                 * the stack.
                 */
            parseInstruction(curOffset, constantVisitor);
            if (constantVisitor.length == 0 || !(constantVisitor.cst instanceof CstLiteralBits))
                break;
            curOffset += constantVisitor.length;
            initVals.add(constantVisitor.cst);
            nextByte = bytes.getUnsignedByte(curOffset++);
            // Now, check if the value is stored to the array properly.
            switch(value) {
                case ByteOps.NEWARRAY_BYTE:
                case ByteOps.NEWARRAY_BOOLEAN:
                    {
                        if (nextByte != ByteOps.BASTORE) {
                            punt = true;
                        }
                        break;
                    }
                case ByteOps.NEWARRAY_CHAR:
                    {
                        if (nextByte != ByteOps.CASTORE) {
                            punt = true;
                        }
                        break;
                    }
                case ByteOps.NEWARRAY_DOUBLE:
                    {
                        if (nextByte != ByteOps.DASTORE) {
                            punt = true;
                        }
                        break;
                    }
                case ByteOps.NEWARRAY_FLOAT:
                    {
                        if (nextByte != ByteOps.FASTORE) {
                            punt = true;
                        }
                        break;
                    }
                case ByteOps.NEWARRAY_SHORT:
                    {
                        if (nextByte != ByteOps.SASTORE) {
                            punt = true;
                        }
                        break;
                    }
                case ByteOps.NEWARRAY_INT:
                    {
                        if (nextByte != ByteOps.IASTORE) {
                            punt = true;
                        }
                        break;
                    }
                case ByteOps.NEWARRAY_LONG:
                    {
                        if (nextByte != ByteOps.LASTORE) {
                            punt = true;
                        }
                        break;
                    }
                default:
                    punt = true;
                    break;
            }
            if (punt) {
                break;
            }
            lastOffset = curOffset;
            nInit++;
        }
    }
    /*
         * For singleton arrays it is still more economical to
         * generate the aput.
         */
    if (nInit < 2 || nInit != arrayLength) {
        visitor.visitNewarray(offset, 2, type, null);
        return 2;
    } else {
        visitor.visitNewarray(offset, lastOffset - offset, type, initVals);
        return lastOffset - offset;
    }
}

Example 2 with CstLiteralBits

use of com.taobao.android.dx.rop.cst.CstLiteralBits in project atlas by alibaba.

the class Form21h method isCompatible.

/** {@inheritDoc} */
@Override
public boolean isCompatible(DalvInsn insn) {
    RegisterSpecList regs = insn.getRegisters();
    if (!((insn instanceof CstInsn) && (regs.size() == 1) && unsignedFitsInByte(regs.get(0).getReg()))) {
        return false;
    }
    CstInsn ci = (CstInsn) insn;
    Constant cst = ci.getConstant();
    if (!(cst instanceof CstLiteralBits)) {
        return false;
    }
    CstLiteralBits cb = (CstLiteralBits) cst;
    // Where the high bits are depends on the category of the target.
    if (regs.get(0).getCategory() == 1) {
        int bits = cb.getIntBits();
        return ((bits & 0xffff) == 0);
    } else {
        long bits = cb.getLongBits();
        return ((bits & 0xffffffffffffL) == 0);
    }
}

Example 3 with CstLiteralBits

use of com.taobao.android.dx.rop.cst.CstLiteralBits in project atlas by alibaba.

the class Form21h method insnCommentString.

/** {@inheritDoc} */
@Override
public String insnCommentString(DalvInsn insn, boolean noteIndices) {
    RegisterSpecList regs = insn.getRegisters();
    CstLiteralBits value = (CstLiteralBits) ((CstInsn) insn).getConstant();
    return literalBitsComment(value, (regs.get(0).getCategory() == 1) ? 32 : 64);
}

Example 4 with CstLiteralBits

use of com.taobao.android.dx.rop.cst.CstLiteralBits in project atlas by alibaba.

the class Form21s method insnArgString.

/** {@inheritDoc} */
@Override
public String insnArgString(DalvInsn insn) {
    RegisterSpecList regs = insn.getRegisters();
    CstLiteralBits value = (CstLiteralBits) ((CstInsn) insn).getConstant();
    return regs.get(0).regString() + ", " + literalBitsString(value);
}

Example 5 with CstLiteralBits

use of com.taobao.android.dx.rop.cst.CstLiteralBits in project atlas by alibaba.

the class Form22b method insnArgString.

/** {@inheritDoc} */
@Override
public String insnArgString(DalvInsn insn) {
    RegisterSpecList regs = insn.getRegisters();
    CstLiteralBits value = (CstLiteralBits) ((CstInsn) insn).getConstant();
    return regs.get(0).regString() + ", " + regs.get(1).regString() + ", " + literalBitsString(value);
}