use of com.taobao.android.dex.util.ByteArrayByteInput 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;
}
}
}
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