Examples with ByteInput com.taobao.android.dex.util.ByteInput used on opensource projects

Example 1 with ByteInput

use of com.taobao.android.dex.util.ByteInput in project atlas by alibaba.

the class DebugInfoDecoder method decode0.

private void decode0() throws IOException {
    ByteInput bs = new ByteArrayByteInput(encoded);
    line = Leb128.readUnsignedLeb128(bs);
    int szParams = Leb128.readUnsignedLeb128(bs);
    StdTypeList params = desc.getParameterTypes();
    int curReg = getParamBase();
    if (szParams != params.size()) {
        throw new RuntimeException("Mismatch between parameters_size and prototype");
    }
    if (!isStatic) {
        // Start off with implicit 'this' entry
        LocalEntry thisEntry = new LocalEntry(0, true, curReg, thisStringIdx, 0, 0);
        locals.add(thisEntry);
        lastEntryForReg[curReg] = thisEntry;
        curReg++;
    }
    for (int i = 0; i < szParams; i++) {
        Type paramType = params.getType(i);
        LocalEntry le;
        int nameIdx = readStringIndex(bs);
        if (nameIdx == -1) {
            /*
                 * Unnamed parameter; often but not always filled in by an
                 * extended start op after the prologue
                 */
            le = new LocalEntry(0, true, curReg, -1, 0, 0);
        } else {
            // TODO: Final 0 should be idx of paramType.getDescriptor().
            le = new LocalEntry(0, true, curReg, nameIdx, 0, 0);
        }
        locals.add(le);
        lastEntryForReg[curReg] = le;
        curReg += paramType.getCategory();
    }
    for (; ; ) {
        int opcode = bs.readByte() & 0xff;
        switch(opcode) {
            case DBG_START_LOCAL:
                {
                    int reg = Leb128.readUnsignedLeb128(bs);
                    int nameIdx = readStringIndex(bs);
                    int typeIdx = readStringIndex(bs);
                    LocalEntry le = new LocalEntry(address, true, reg, nameIdx, typeIdx, 0);
                    locals.add(le);
                    lastEntryForReg[reg] = le;
                }
                break;
            case DBG_START_LOCAL_EXTENDED:
                {
                    int reg = Leb128.readUnsignedLeb128(bs);
                    int nameIdx = readStringIndex(bs);
                    int typeIdx = readStringIndex(bs);
                    int sigIdx = readStringIndex(bs);
                    LocalEntry le = new LocalEntry(address, true, reg, nameIdx, typeIdx, sigIdx);
                    locals.add(le);
                    lastEntryForReg[reg] = le;
                }
                break;
            case DBG_RESTART_LOCAL:
                {
                    int reg = Leb128.readUnsignedLeb128(bs);
                    LocalEntry prevle;
                    LocalEntry le;
                    try {
                        prevle = lastEntryForReg[reg];
                        if (prevle.isStart) {
                            throw new RuntimeException("nonsensical " + "RESTART_LOCAL on live register v" + reg);
                        }
                        le = new LocalEntry(address, true, reg, prevle.nameIndex, prevle.typeIndex, 0);
                    } catch (NullPointerException ex) {
                        throw new RuntimeException("Encountered RESTART_LOCAL on new v" + reg);
                    }
                    locals.add(le);
                    lastEntryForReg[reg] = le;
                }
                break;
            case DBG_END_LOCAL:
                {
                    int reg = Leb128.readUnsignedLeb128(bs);
                    LocalEntry prevle;
                    LocalEntry le;
                    try {
                        prevle = lastEntryForReg[reg];
                        if (!prevle.isStart) {
                            throw new RuntimeException("nonsensical " + "END_LOCAL on dead register v" + reg);
                        }
                        le = new LocalEntry(address, false, reg, prevle.nameIndex, prevle.typeIndex, prevle.signatureIndex);
                    } catch (NullPointerException ex) {
                        throw new RuntimeException("Encountered END_LOCAL on new v" + reg);
                    }
                    locals.add(le);
                    lastEntryForReg[reg] = le;
                }
                break;
            case DBG_END_SEQUENCE:
                // all done
                return;
            case DBG_ADVANCE_PC:
                address += Leb128.readUnsignedLeb128(bs);
                break;
            case DBG_ADVANCE_LINE:
                line += Leb128.readSignedLeb128(bs);
                break;
            case DBG_SET_PROLOGUE_END:
                //TODO do something with this.
                break;
            case DBG_SET_EPILOGUE_BEGIN:
                //TODO do something with this.
                break;
            case DBG_SET_FILE:
                //TODO do something with this.
                break;
            default:
                if (opcode < DBG_FIRST_SPECIAL) {
                    throw new RuntimeException("Invalid extended opcode encountered " + opcode);
                }
                int adjopcode = opcode - DBG_FIRST_SPECIAL;
                address += adjopcode / DBG_LINE_RANGE;
                line += DBG_LINE_BASE + (adjopcode % DBG_LINE_RANGE);
                positions.add(new PositionEntry(address, line));
                break;
        }
    }
}