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AS3 parser: try..finally

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Jindra Petk
2014-04-06 20:08:20 +02:00
parent 7e19be36c8
commit e5a9b6d28c
10 changed files with 663 additions and 299 deletions
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51
trunk/src/com/jpexs/decompiler/flash/abc/avm2/AVM2Code.java
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@@ -1848,14 +1848,15 @@ public class AVM2Code implements Serializable {
private boolean walkCode(CodeStats stats, int pos, int stack, int scope, ABC abc) {
while (pos < code.size()) {
AVM2Instruction ins = code.get(pos);
if (stats.instructionStats[pos].seen) {
//check stack mismatch here
return true;
return true;
}
stats.instructionStats[pos].seen = true;
stats.instructionStats[pos].stackpos = stack;
stats.instructionStats[pos].scopepos = scope;
AVM2Instruction ins = code.get(pos);
int stackDelta = ins.definition.getStackDelta(ins, abc);
int scopeDelta = ins.definition.getScopeStackDelta(ins, abc);
int oldStack = stack;
@@ -1864,6 +1865,9 @@ public class AVM2Code implements Serializable {
stack += stackDelta;
scope += scopeDelta;
stats.instructionStats[pos].stackpos_after = stack;
stats.instructionStats[pos].scopepos_after = scope;
if (stack > stats.maxstack) {
stats.maxstack = stack;
}
@@ -1914,6 +1918,9 @@ public class AVM2Code implements Serializable {
}
if (ins.definition instanceof LookupSwitchIns) {
for (int i = 0; i < ins.operands.length; i++) {
if (i == 1) {
continue;
}
try {
int newpos = adr2pos(pos2adr(pos) + ins.operands[i]);
if (!walkCode(stats, newpos, stack, scope, abc)) {
@@ -1935,29 +1942,51 @@ public class AVM2Code implements Serializable {
return null;
}
int scopePos = -1;
for (ABCException ex : body.exceptions) {
int prevStart = 0;
for (int e=0;e<body.exceptions.length;e++) {
ABCException ex = body.exceptions[e];
try {
if(scopePos==-1){
scopePos=stats.instructionStats[adr2pos(ex.end)-1].scopepos;
if (scopePos == -1) {
scopePos = stats.instructionStats[adr2pos(ex.end) - 1].scopepos_after;
}
List<Integer> visited = new ArrayList<>();
for(int i=0;i<stats.instructionStats.length;i++){
if(stats.instructionStats[i].seen){
for (int i = 0; i < stats.instructionStats.length; i++) {
if (stats.instructionStats[i].seen) {
visited.add(i);
}
}
if (!walkCode(stats, adr2pos(ex.target), 1/*exception*/, scopePos, abc)) {
if (!walkCode(stats, adr2pos(ex.target), 1 + (ex.isFinally() ? 1 : 0), scopePos, abc)) {
return null;
}
int maxIp = 0;
//searching for visited instruction in second run which has maximum position
for(int i=0;i<stats.instructionStats.length;i++){
if(stats.instructionStats[i].seen && !visited.contains(i)){
for (int i = 0; i < stats.instructionStats.length; i++) {
if (stats.instructionStats[i].seen && !visited.contains(i)) {
maxIp = i;
}
}
scopePos = stats.instructionStats[maxIp].scopepos;
scopePos = stats.instructionStats[maxIp].scopepos_after;
int stackPos = stats.instructionStats[maxIp].stackpos_after;
int nextIp = maxIp + 1;
if(code.get(maxIp).definition instanceof JumpIns){
nextIp = adr2pos(pos2adr(nextIp)+code.get(maxIp).operands[0]);
}
int origScopePos = stats.instructionStats[nextIp].scopepos;
int origStackPos = stats.instructionStats[nextIp].stackpos;
if (prevStart==ex.start && ex.isFinally() && !code.get(nextIp).isExit() && stats.instructionStats[nextIp].seen) {
for (int i = 0; i < stats.instructionStats.length; i++) {
stats.instructionStats[i].seen = false;
}
//Rerun rest with new scopePos, stackPos
if (!walkCode(stats, nextIp, origStackPos+1/*magic!*/, scopePos - 1 /*magic!*/, abc)) {
return null;
}
scopePos--;
}
prevStart = ex.start;
} catch (ConvertException ex1) {
//ignore
}
}
//stats.maxscope+=initScope;