protected boolean isRegisterCompileTime(
int regId, int ip, HashMap<Integer, List<Integer>> refs, AVM2Code code) {
Set<Integer> previous = new HashSet<>();
AVM2Code.getPreviousReachableIps(ip, refs, previous, new HashSet<>());
for (int p : previous) {
if (p < 0) {
continue;
}
if (p >= code.code.size()) {
continue;
}
AVM2Instruction sins = code.code.get(p);
if (code.code.get(p).definition instanceof SetLocalTypeIns) {
SetLocalTypeIns sl = (SetLocalTypeIns) sins.definition;
if (sl.getRegisterId(sins) == regId) {
if (!AVM2Code.isDirectAncestor(ip, p, refs)) {
return false;
}
}
}
if ((code.code.get(p).definition instanceof IncLocalIns)
|| (code.code.get(p).definition instanceof IncLocalIIns)
|| (code.code.get(p).definition instanceof DecLocalIns)
|| (code.code.get(p).definition instanceof DecLocalIIns)) {
if (sins.operands[0] == regId) {
if (!AVM2Code.isDirectAncestor(ip, p, refs)) {
return false;
}
}
}
}
return true;
}
@Override
public void avm2CodeRemoveTraps(
String path,
int classIndex,
boolean isStatic,
int scriptIndex,
ABC abc,
Trait trait,
int methodInfo,
MethodBody body)
throws InterruptedException {
AVM2Code code = body.getCode();
code.removeDeadCode(body);
removeObfuscationIfs(classIndex, isStatic, scriptIndex, abc, body, null);
removeZeroJumps(code, body);
}
protected boolean removeObfuscationIfs(
int classIndex,
boolean isStatic,
int scriptIndex,
ABC abc,
MethodBody body,
AVM2Instruction inlineIns)
throws InterruptedException {
AVM2Code code = body.getCode();
if (code.code.isEmpty()) {
return false;
}
Map<Integer, Object> staticRegs = new HashMap<>();
if (inlineIns != null && inlineIns.definition instanceof GetLocalTypeIns) {
staticRegs.put(
((GetLocalTypeIns) inlineIns.definition).getRegisterId(inlineIns), Undefined.INSTANCE);
}
if (code.code.isEmpty()) {
return false;
}
FixItemCounterStack stack = new FixItemCounterStack();
LocalDataArea localData = new LocalDataArea();
localData.operandStack = stack;
int localReservedCount = body.getLocalReservedCount();
for (int i = 0; i < code.code.size(); i++) {
if (Thread.currentThread().isInterrupted()) {
throw new InterruptedException();
}
localData.clear();
initLocalRegs(localData, localReservedCount, body.max_regs, i == 0);
if (executeInstructions(
staticRegs, body, abc, code, localData, i, code.code.size() - 1, null, inlineIns)) {
code.removeDeadCode(body);
i--;
}
}
return false;
}
protected boolean removeZeroJumps(AVM2Code code, MethodBody body) throws InterruptedException {
boolean result = false;
for (int i = 0; i < code.code.size(); i++) {
AVM2Instruction ins = code.code.get(i);
if (ins.definition instanceof JumpIns) {
if (ins.operands[0] == 0) {
if (Thread.currentThread().isInterrupted()) {
throw new InterruptedException();
}
code.removeInstruction(i, body);
i--;
result = true;
}
}
}
return result;
}
private int visitCode(
Reference<AVM2Instruction> assignment,
Set<Integer> visited,
TranslateStack stack,
int classIndex,
boolean isStatic,
MethodBody body,
int scriptIndex,
ABC abc,
AVM2Code code,
int idx,
int endIdx,
Set<Integer> ignored,
Set<Integer> ignoredGets)
throws InterruptedException {
List<GraphTargetItem> output = new ArrayList<>();
AVM2LocalData localData =
newLocalData(scriptIndex, abc, abc.constants, body, isStatic, classIndex);
initLocalRegs(localData, body.getLocalReservedCount(), body.max_regs);
localData.localRegs.put(0, new NullAVM2Item(null, null)); // this
List<Integer> toVisit = new ArrayList<>();
toVisit.add(idx);
List<TranslateStack> toVisitStacks = new ArrayList<>();
toVisitStacks.add(stack);
outer:
while (!toVisit.isEmpty()) {
if (Thread.currentThread().isInterrupted()) {
throw new InterruptedException();
}
idx = toVisit.remove(0);
stack = toVisitStacks.remove(0);
while (true) {
if (idx > endIdx) {
break;
}
if (visited.contains(idx)) {
break;
}
visited.add(idx);
AVM2Instruction ins = code.code.get(idx);
InstructionDefinition def = ins.definition;
// System.err.println("" + idx + ": " + ins + " stack:" + stack.size());
// do not throw EmptyStackException, much faster
int requiredStackSize = ins.getStackPopCount(localData);
if (stack.size() < requiredStackSize) {
continue outer;
}
ins.translate(localData, stack, output, Graph.SOP_USE_STATIC, "");
if (def instanceof SetLocalTypeIns) {
int regId = ((SetLocalTypeIns) def).getRegisterId(ins);
if (!ignored.contains(regId)) {
assignment.setVal(ins);
return regId;
}
} else if (def instanceof GetLocalTypeIns) {
int regId = ((GetLocalTypeIns) def).getRegisterId(ins);
if (!ignored.contains(regId) && !ignoredGets.contains(regId)) {
assignment.setVal(ins);
return regId;
}
} else if (!(def instanceof KillIns) && !(def instanceof DebugIns)) {
// can be inclocal, declocal, hasnext...
for (int p = 0; p < ins.definition.operands.length; p++) {
int op = ins.definition.operands[p];
if (op == AVM2Code.DAT_LOCAL_REG_INDEX) {
int regId = ins.operands[p];
if (!ignored.contains(regId)) {
assignment.setVal(ins);
return regId;
}
}
}
}
idx++;
if (ins.definition instanceof JumpIns) {
long address = ins.offset + ins.getBytesLength() + ins.operands[0];
idx = code.adr2pos(address); // code.indexOf(code.getByAddress(address));
if (idx == -1) {
throw new TranslateException("Jump target not found: " + address);
}
}
if (ins.isBranch()) {
List<Integer> branches =
ins.getBranches(
new GraphSource() {
@Override
public int size() {
throw new UnsupportedOperationException(
"Not supported yet."); // To change body of generated methods, choose
// Tools | Templates.
}
@Override
public GraphSourceItem get(int pos) {
throw new UnsupportedOperationException(
"Not supported yet."); // To change body of generated methods, choose
// Tools | Templates.
}
@Override
public boolean isEmpty() {
throw new UnsupportedOperationException(
"Not supported yet."); // To change body of generated methods, choose
// Tools | Templates.
}
@Override
public List<GraphTargetItem> translatePart(
GraphPart part,
BaseLocalData localData,
TranslateStack stack,
int start,
int end,
int staticOperation,
String path)
throws InterruptedException {
throw new UnsupportedOperationException(
"Not supported yet."); // To change body of generated methods, choose
// Tools | Templates.
}
@Override
public int adr2pos(long adr) {
return code.adr2pos(adr);
}
@Override
public long pos2adr(int pos) {
return code.pos2adr(pos);
}
});
idx = branches.get(0);
for (int n = 1; n < branches.size(); n++) {
// visitCode(visited, (TranslateStack) stack.clone(), classIndex, isStatic, body,
// scriptIndex, abc, code, branches.get(n), endIdx, result);
int nidx = branches.get(n);
if (visited.contains(nidx)) {
continue;
}
toVisit.add(nidx);
toVisitStacks.add((TranslateStack) stack.clone());
}
}
/*if (ins.definition instanceof IfTypeIns) {
long address = ins.offset + ins.getBytes().length + ins.operands[0];
int newIdx = code.adr2pos(address);
if (newIdx == -1) {
throw new TranslateException("If target not found: " + address);
}
visitCode(visited, (TranslateStack) stack.clone(), classIndex, isStatic, body, scriptIndex, abc, code, newIdx, endIdx, result);
}*/
if (ins.definition instanceof ReturnValueIns) {
break;
}
if (ins.definition instanceof ThrowIns) {
break;
}
if (ins.definition instanceof ReturnVoidIns) {
break;
}
}
}
return -1;
}
private boolean executeInstructions(
Map<Integer, Object> staticRegs,
MethodBody body,
ABC abc,
AVM2Code code,
LocalDataArea localData,
int idx,
int endIdx,
ExecutionResult result,
AVM2Instruction inlineIns)
throws InterruptedException {
int instructionsProcessed = 0;
FixItemCounterStack stack = (FixItemCounterStack) localData.operandStack;
Set<Long> refs = code.getImportantOffsets(body);
boolean modified = false;
while (true) {
if (idx > endIdx) {
break;
}
if (instructionsProcessed > executionLimit) {
break;
}
AVM2Instruction ins = code.code.get(idx);
if (instructionsProcessed > 0 && refs.contains(ins.getOffset())) {
break;
}
modified = modified | code.inlineJumpExit();
InstructionDefinition def = ins.definition;
if (inlineIns == ins) {
if (def instanceof SetLocalTypeIns) {
int regId = ((SetLocalTypeIns) def).getRegisterId(ins);
staticRegs.put(regId, localData.localRegisters.get(regId));
code.replaceInstruction(
idx, new AVM2Instruction(0, DeobfuscatePopIns.getInstance(), null), body);
modified = true;
}
}
if (def instanceof GetLocalTypeIns) {
int regId = ((GetLocalTypeIns) def).getRegisterId(ins);
if (staticRegs.containsKey(regId)) {
AVM2Instruction pushins = abc.constants.makePush(staticRegs.get(regId));
if (pushins == null) {
break;
}
code.replaceInstruction(idx, pushins, body);
modified = true;
ins = pushins;
def = ins.definition;
}
}
if (def instanceof NewFunctionIns
&& idx + 1 < code.code.size()
&& code.code.get(idx + 1).definition instanceof PopIns) {
code.removeInstruction(idx + 1, body);
code.removeInstruction(idx, body);
modified = true;
continue;
}
boolean ok = false;
// todo: honfika: order by statistics
if (def.isNotCompileTimeSupported()
|| def instanceof PushByteIns
|| def instanceof PushShortIns
|| def instanceof PushIntIns
|| def instanceof PushDoubleIns
|| def instanceof PushStringIns
|| def instanceof PushNullIns
|| def instanceof PushUndefinedIns
|| def instanceof PushFalseIns
|| def instanceof PushTrueIns
|| def instanceof DupIns
|| def instanceof SwapIns
|| def instanceof AddIns
|| def instanceof AddIIns
|| def instanceof SubtractIns
|| def instanceof SubtractIIns
|| def instanceof ModuloIns
|| def instanceof MultiplyIns
|| def instanceof MultiplyIIns //
|| def instanceof DivideIns //
|| def instanceof BitAndIns
|| def instanceof BitXorIns
|| def instanceof BitOrIns
|| def instanceof LShiftIns
|| def instanceof RShiftIns
|| def instanceof URShiftIns
|| def instanceof EqualsIns
|| def instanceof NotIns
|| def instanceof NegateIns //
|| def instanceof NegateIIns //
|| def instanceof IncrementIns //
|| def instanceof IncrementIIns //
|| def instanceof DecrementIns //
|| def instanceof DecrementIIns //
|| def instanceof IfTypeIns
|| def instanceof JumpIns
|| def instanceof EqualsIns
|| def instanceof LessEqualsIns
|| def instanceof GreaterEqualsIns
|| def instanceof GreaterThanIns
|| def instanceof LessThanIns
|| def instanceof StrictEqualsIns
|| def instanceof PopIns
|| def instanceof GetLocalTypeIns
|| def instanceof SetLocalTypeIns
|| def instanceof NewFunctionIns
|| def instanceof CoerceOrConvertTypeIns) {
ok = true;
}
if (!ok) {
break;
}
if (!(def instanceof NewFunctionIns)) {
// do not throw EmptyStackException, much faster
int requiredStackSize = def.getStackPopCount(ins, abc);
if (stack.size() < requiredStackSize) {
break;
}
if (requiredStackSize > 0 && !def.isNotCompileTimeSupported()) {
boolean notCompileTime = false;
for (int i = 0; i < requiredStackSize; i++) {
if (stack.peek(i + 1) == NotCompileTime.INSTANCE) {
notCompileTime = true;
break;
}
}
if (notCompileTime) {
break;
}
}
if (localData.scopeStack.size() < -def.getScopeStackDelta(ins, abc)) {
break;
}
boolean supported;
try {
localData.jump = null;
supported = def.execute(localData, abc.constants, ins);
} catch (AVM2ExecutionException ex) {
supported = false;
}
if (!supported) {
break;
}
}
boolean ifed = false;
if (def instanceof IfTypeIns && !(def instanceof JumpIns)) {
long address = ins.getTargetAddress();
int nidx = code.adr2pos(address);
AVM2Instruction tarIns = code.code.get(nidx);
// Some IfType instructions need more than 1 operand, we must pop out all of them
int stackCount = -def.getStackDelta(ins, abc);
if (localData.jump != null) {
// System.err.println("replacing " + ins + " on " + idx + " with jump");
AVM2Instruction jumpIns = new AVM2Instruction(0, AVM2Instructions.Jump, new int[] {0});
// jumpIns.operands[0] = ins.operands[0] /*- ins.getBytes().length*/ +
// jumpIns.getBytes().length;
code.replaceInstruction(idx, jumpIns, body);
jumpIns.operands[0] =
(int) (tarIns.getOffset() - jumpIns.getOffset() - jumpIns.getBytesLength());
for (int s = 0; s < stackCount; s++) {
code.insertInstruction(
idx,
new AVM2Instruction(ins.getOffset(), DeobfuscatePopIns.getInstance(), null),
true,
body);
}
idx = code.adr2pos(jumpIns.getTargetAddress());
} else {
// System.err.println("replacing " + ins + " on " + idx + " with pop");
code.replaceInstruction(
idx,
new AVM2Instruction(ins.getOffset(), DeobfuscatePopIns.getInstance(), null),
body);
for (int s = 1 /*first is replaced*/; s < stackCount; s++) {
code.insertInstruction(
idx,
new AVM2Instruction(ins.getOffset(), DeobfuscatePopIns.getInstance(), null),
true,
body);
}
// ins.definition = DeobfuscatePopIns.getInstance();
idx++;
}
modified = true;
ifed = true;
} else {
idx++;
}
instructionsProcessed++;
if (result != null && stack.allItemsFixed()) {
result.idx = idx == code.code.size() ? idx - 1 : idx;
result.instructionsProcessed = instructionsProcessed;
result.stack.clear();
result.stack.addAll(stack);
}
if (ifed) {
break;
}
if (localData.jump != null) {
idx = code.adr2pos(localData.jump);
if (idx == -1) {
throw new TranslateException("Jump target not found: " + localData.jump);
}
}
}
return modified;
}