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AS3 deobfuscator of registers parsing of exception targets

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This commit is contained in:
Jindra Petřík
2021-02-03 09:32:35 +01:00
parent 322991be68
commit 603a49261b
2 changed files with 54 additions and 2 deletions
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55
libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/abc/avm2/deobfuscation/AVM2DeobfuscatorRegistersOld.java
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@@ -12,7 +12,8 @@
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library.
* License along with this library.
*/
package com.jpexs.decompiler.flash.abc.avm2.deobfuscation;
import com.jpexs.decompiler.flash.BaseLocalData;
@@ -30,6 +31,8 @@ import com.jpexs.decompiler.flash.abc.avm2.instructions.other.ReturnValueIns;
import com.jpexs.decompiler.flash.abc.avm2.instructions.other.ReturnVoidIns;
import com.jpexs.decompiler.flash.abc.avm2.instructions.other.ThrowIns;
import com.jpexs.decompiler.flash.abc.avm2.model.NullAVM2Item;
import com.jpexs.decompiler.flash.abc.avm2.model.clauses.ExceptionAVM2Item;
import com.jpexs.decompiler.flash.abc.types.ABCException;
import com.jpexs.helpers.Reference;
import com.jpexs.decompiler.flash.abc.types.MethodBody;
import com.jpexs.decompiler.flash.abc.types.traits.Trait;
@@ -42,8 +45,10 @@ import com.jpexs.decompiler.graph.TranslateException;
import com.jpexs.decompiler.graph.TranslateStack;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
@@ -154,10 +159,42 @@ public class AVM2DeobfuscatorRegistersOld extends AVM2DeobfuscatorSimpleOld {
return -1;
}
Set<Integer> visited = new HashSet<>();
return visitCode(assignment, visited, new TranslateStack("deo"), classIndex, isStatic, body, scriptIndex, abc, code, 0, code.code.size() - 1, ignoredRegisters, ignoredGets);
}
private class ExceptionTargetIpPair {
private final ABCException exception;
private final int targetIp;
public ExceptionTargetIpPair(ABCException exception, int targetIp) {
this.exception = exception;
this.targetIp = targetIp;
}
public ABCException getException() {
return exception;
}
public int getTargetIp() {
return targetIp;
}
}
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 {
Map<Integer, List<ExceptionTargetIpPair>> exceptionStartToTargets = new HashMap<>();
for (ABCException ex : body.exceptions) {
int startIp = code.adr2pos(ex.start);
int targetIp = code.adr2pos(ex.target);
if (!exceptionStartToTargets.containsKey(startIp)) {
exceptionStartToTargets.put(startIp, new ArrayList<>());
}
exceptionStartToTargets.get(startIp).add(new ExceptionTargetIpPair(ex, targetIp));
}
List<GraphTargetItem> output = new ArrayList<>();
AVM2LocalData localData = newLocalData(scriptIndex, abc, abc.constants, body, isStatic, classIndex);
initLocalRegs(localData, body.getLocalReservedCount(), body.max_regs);
@@ -185,6 +222,20 @@ public class AVM2DeobfuscatorRegistersOld extends AVM2DeobfuscatorSimpleOld {
}
visited.add(idx);
if (exceptionStartToTargets.containsKey(idx)) {
for (ExceptionTargetIpPair pair : exceptionStartToTargets.get(idx)) {
toVisit.add(pair.targetIp);
TranslateStack targetStack = (TranslateStack) stack.clone();
targetStack.push(new ExceptionAVM2Item(pair.exception));
toVisitStacks.add(targetStack);
}
}
for (ABCException ex : body.exceptions) {
if (code.pos2adr(idx) == ex.start) {
}
}
AVM2Instruction ins = code.code.get(idx);
InstructionDefinition def = ins.definition;
//System.err.println("" + idx + ": " + ins + " stack:" + stack.size());