@Nonnull
@Override
public VariableSizeIterator<String> getParameterNames(@Nullable DexReader reader) {
if (reader == null) {
reader = dexFile.readerAt(debugInfoOffset);
reader.skipUleb128();
}
// TODO: make sure dalvik doesn't allow more parameter names than we have parameters
final int parameterNameCount = reader.readSmallUleb128();
return new VariableSizeIterator<String>(reader, parameterNameCount) {
@Override
protected String readNextItem(@Nonnull DexReader reader, int index) {
return dexFile.getOptionalString(reader.readSmallUleb128() - 1);
}
};
}
@Nonnull
@Override
public Iterator<DebugItem> iterator() {
DexReader reader = dexFile.readerAt(debugInfoOffset);
final int lineNumberStart = reader.readBigUleb128();
int registerCount = methodImpl.getRegisterCount();
// TODO: does dalvik allow references to invalid registers?
final LocalInfo[] locals = new LocalInfo[registerCount];
Arrays.fill(locals, EMPTY_LOCAL_INFO);
DexBackedMethod method = methodImpl.method;
// Create a MethodParameter iterator that uses our DexReader instance to read the parameter
// names.
// After we have finished iterating over the parameters, reader will "point to" the beginning
// of the
// debug instructions
final Iterator<? extends MethodParameter> parameterIterator =
new ParameterIterator(
method.getParameterTypes(),
method.getParameterAnnotations(),
getParameterNames(reader));
// first, we grab all the parameters and temporarily store them at the beginning of locals,
// disregarding any wide types
int parameterIndex = 0;
if (!AccessFlags.STATIC.isSet(methodImpl.method.getAccessFlags())) {
// add the local info for the "this" parameter
locals[parameterIndex++] =
new LocalInfo() {
@Override
public String getName() {
return "this";
}
@Override
public String getType() {
return methodImpl.method.getDefiningClass();
}
@Override
public String getSignature() {
return null;
}
};
}
while (parameterIterator.hasNext()) {
locals[parameterIndex++] = parameterIterator.next();
}
if (parameterIndex < registerCount) {
// now, we push the parameter locals back to their appropriate register, starting from the
// end
int localIndex = registerCount - 1;
while (--parameterIndex > -1) {
LocalInfo currentLocal = locals[parameterIndex];
String type = currentLocal.getType();
if (type != null && (type.equals("J") || type.equals("D"))) {
localIndex--;
if (localIndex == parameterIndex) {
// there's no more room to push, the remaining registers are already in the correct
// place
break;
}
}
locals[localIndex] = currentLocal;
locals[parameterIndex] = EMPTY_LOCAL_INFO;
localIndex--;
}
}
return new VariableSizeLookaheadIterator<DebugItem>(dexFile, reader.getOffset()) {
private int codeAddress = 0;
private int lineNumber = lineNumberStart;
@Nullable
protected DebugItem readNextItem(@Nonnull DexReader reader) {
while (true) {
int next = reader.readUbyte();
switch (next) {
case DebugItemType.END_SEQUENCE:
{
return null;
}
case DebugItemType.ADVANCE_PC:
{
int addressDiff = reader.readSmallUleb128();
codeAddress += addressDiff;
continue;
}
case DebugItemType.ADVANCE_LINE:
{
int lineDiff = reader.readSleb128();
lineNumber += lineDiff;
continue;
}
case DebugItemType.START_LOCAL:
{
int register = reader.readSmallUleb128();
String name = dexFile.getOptionalString(reader.readSmallUleb128() - 1);
String type = dexFile.getOptionalType(reader.readSmallUleb128() - 1);
ImmutableStartLocal startLocal =
new ImmutableStartLocal(codeAddress, register, name, type, null);
locals[register] = startLocal;
return startLocal;
}
case DebugItemType.START_LOCAL_EXTENDED:
{
int register = reader.readSmallUleb128();
String name = dexFile.getOptionalString(reader.readSmallUleb128() - 1);
String type = dexFile.getOptionalType(reader.readSmallUleb128() - 1);
String signature = dexFile.getOptionalString(reader.readSmallUleb128() - 1);
ImmutableStartLocal startLocal =
new ImmutableStartLocal(codeAddress, register, name, type, signature);
locals[register] = startLocal;
return startLocal;
}
case DebugItemType.END_LOCAL:
{
int register = reader.readSmallUleb128();
LocalInfo localInfo = locals[register];
boolean replaceLocalInTable = true;
if (localInfo instanceof EndLocal) {
localInfo = EMPTY_LOCAL_INFO;
// don't replace the local info in locals. The new EndLocal won't have any info
// at all,
// and we dont want to wipe out what's there, so that it is available for a
// subsequent
// RestartLocal
replaceLocalInTable = false;
}
ImmutableEndLocal endLocal =
new ImmutableEndLocal(
codeAddress,
register,
localInfo.getName(),
localInfo.getType(),
localInfo.getSignature());
if (replaceLocalInTable) {
locals[register] = endLocal;
}
return endLocal;
}
case DebugItemType.RESTART_LOCAL:
{
int register = reader.readSmallUleb128();
LocalInfo localInfo = locals[register];
ImmutableRestartLocal restartLocal =
new ImmutableRestartLocal(
codeAddress,
register,
localInfo.getName(),
localInfo.getType(),
localInfo.getSignature());
locals[register] = restartLocal;
return restartLocal;
}
case DebugItemType.PROLOGUE_END:
{
return new ImmutablePrologueEnd(codeAddress);
}
case DebugItemType.EPILOGUE_BEGIN:
{
return new ImmutableEpilogueBegin(codeAddress);
}
case DebugItemType.SET_SOURCE_FILE:
{
String sourceFile = dexFile.getOptionalString(reader.readSmallUleb128() - 1);
return new ImmutableSetSourceFile(codeAddress, sourceFile);
}
default:
{
int adjusted = next - 0x0A;
codeAddress += adjusted / 15;
lineNumber += (adjusted % 15) - 4;
return new ImmutableLineNumber(codeAddress, lineNumber);
}
}
}
}
};
}