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Decompiler.pas
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Decompiler.pas
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Unit Decompiler;
Interface
Uses Windows, Classes, KnowledgeBase, DisAsm, Infos, Def_decomp, Def_disasm,Def_info,
Def_know,Def_main,Types;
Type
TForInfo = class
public
NoVar:Boolean;
Down:Boolean; //downto (=true)
StopAdr:Integer; //instructions are ignored from this address and to end of cycle
From:AnsiString;
_To:AnsiString;
VarInfo:IdxInfo;
CntInfo:IdxInfo;
Constructor Create(ANoVar, ADown:Boolean; AStopAdr:Integer; AFrom, ATo:AnsiString; AVarType:Byte; AVarIdx:Integer; ACntType:Byte; ACntIdx:Integer);
end;
TWhileInfo = class
public
NoCondition:Boolean; //No condition
Constructor Create(ANoCond:Boolean);
End;
TLoopInfo = class
public
Kind:Char; //'F'- for; 'W' - while; 'T' - while true; 'R' - repeat
ContAdr:Integer; //Continue address
BreakAdr:Integer; //Break address
LastAdr:Integer; //Last address for decompilation (skip some last instructions)
forInfo:TForInfo;
whileInfo:TWhileInfo;
constructor Create(AKind:Char; AContAdr, ABreakAdr, ALastAdr:Integer);
end;
TNamer = class
public
MaxIdx:Integer;
Names:TStringList;
Constructor Create;
Destructor Destroy; Override;
Function MakeName(template:AnsiString):AnsiString;
end;
TDecompiler=class;
TDecompileEnv = class
public
ProcName:AnsiString; //Name of decompiled procedure
StartAdr:Integer; //Start of decompilation area
Size:Integer; //Size of decompilation area
Indent:Integer; //For output source code
Alarm:Boolean;
BpBased:Boolean;
LocBase:Integer;
StackSize:Integer;
Stack:PItemArr;
ErrAdr:Integer;
LastResString:AnsiString;
Body:TStringList;
RegInfo:Regs; // Normal registers context
FStack:Regs; //Floating registers stack
Namer:TNamer;
BJLnum:Integer;
BJLmaxbcnt:Integer;
SavedContext:TList;
BJLseq:TList;//TBJLInfo
BJLlist:TList;//TBJL
CmpStack:TList;
Embedded:Boolean; // Is proc emebedded ?
EmbeddedList:TStringList;//List of embedded procedures addresses
constructor Create(AStartAdr:Integer; ASize:Integer; recN:InfoRec);
Destructor Destroy; Override;
function GetLvarName(Ofs:Integer;Const _Type:AnsiString): AnsiString;
Procedure AddToBody(src:AnsiString); Overload;
Procedure AddToBody(src:TStringList); Overload;
Function IsExitAtBodyEnd:Boolean;
Procedure OutputSourceCodeLine(line:AnsiString);
Procedure OutputSourceCode;
Procedure DecompileProc;
//BJL
Function GetBJLRange(fromAdr:Integer; var bodyBegAdr, bodyEndAdr, jmpAdr:Integer; loopInfo:TLoopInfo):Boolean;
Procedure CreateBJLSequence(fromAdr, bodyBegAdr, bodyEndAdr:Integer);
Procedure UpdateBJLList;
procedure BJLAnalyze;
function BJLGetIdx(idx:PIntegerArray; from, num:Integer): Boolean;
Function BJLCheckPattern1(t:PAnsiChar; from:Integer):Boolean;
Function BJLCheckPattern2(t:PAnsiChar; from:Integer):Boolean;
Function BJLFindLabel(address:Integer; var no:Integer):Integer;
procedure BJLSeqSetStateU(idx:PIntegerArray; num:Integer);
Procedure BJLListSetUsed(from, num:Integer);
Function ExprGetOperation(s:AnsiString):Char;
Procedure ExprMerge(var dst:AnsiString; src:AnsiString; op:Char);//dst = dst op src, op = '|' or '&'
Function PrintBJL:AnsiString;
Function GetContext(Adr:Integer):PDContext;
Procedure SaveContext(Adr:Integer);
Procedure RestoreContext(Adr:Integer);
end;
TDecompiler = class
public
WasRet:Boolean; //Was ret instruction
CmpOp:Char; //Compare operation
CmpAdr:Integer; //Compare dest address
_ESP_:Integer; //Stack pointer
_TOP_:Integer; //Top of FStack
DisaInfo:TDisInfo;
CompInfo:TCmpItem;
Env:TDecompileEnv;
DeFlags:TByteDynArray;
Stack:PItem;
Constructor Create(AEnv:TDecompileEnv);
Destructor Destroy; Override;
Function CheckPrototype(ARec:InfoRec):Boolean;
Procedure ClearStop(Adr:Integer);
function Decompile(fromAdr:Integer; flags:TDecomCset; loopInfo:TLoopInfo): Integer;
function DecompileCaseEnum(fromAdr:Integer; Q:Integer; loopInfo:TLoopInfo): Integer;
function DecompileGeneralCase(fromAdr, markAdr:Integer; loopInfo:TLoopInfo; Q:Integer): Integer;
Function DecompileTry(fromAdr:Integer; flags:TDecomCset; loopInfo:TLoopInfo):Integer;
Function FGet(idx:Integer):PItem;
function FPop: PITEM;
Procedure FPush(val:PITEM);
Procedure FSet(idx:Integer; val:PITEM);
Procedure FXch(idx1,idx2:Integer);
function GetArrayFieldOffset(ATypeName:AnsiString; AFromOfs, AScale:Integer;var _name,_type:AnsiString): Integer;
Function GetCmpInfo(fromAdr:Integer):Integer;
Function GetCycleFrom:AnsiString;
Procedure GetCycleIdx(IdxInfo:PIdxInfo; ADisInfo:TDisInfo);
Function GetCycleTo:AnsiString;
Procedure GetInt64ItemFromStack (Esp:Integer; Dst:PITEM);
procedure GetFloatItemFromStack(Esp:Integer; Dst:PITEM; FloatType:TFloatKind);
Function GetStringArgument(item:PItem):AnsiString;
Function GetLoopInfo(fromAdr:Integer):TLoopInfo;
Procedure GetMemItem(CurAdr:Integer; Dst:PITEM; Op:Byte);
procedure GetRegItem(Idx:Integer; var Dst:TITEM);
Function GetRegType(Idx:Integer):AnsiString;
Function GetSysCallAlias(AName:AnsiString):AnsiString;
Function Init(fromAdr:Integer):Boolean;
Procedure InitFlags;
Procedure MarkCaseEnum(fromAdr:Integer);
Procedure MarkGeneralCase(fromAdr:Integer);
Function Pop:PItem;
Procedure Push(item:PITEM);
Procedure SetStackPointers(ASrc:TDecompiler);
Procedure SetDeFlags(ASrc:Pointer);
procedure SetRegItem(Idx:Integer; var val:TITEM);
Procedure SetStop(Adr:Integer);
function SimulateCall(curAdr, callAdr:Integer; instrLen:Integer; mtd:PMethodRec; AClassAdr:Integer): Boolean;
procedure SimulateFloatInstruction(curAdr:Integer);
Procedure SimulateFormatCall;
Procedure SimulateInherited(procAdr:Integer);
Procedure SimulateInstr1(curAdr:Integer; Op:Byte);
Procedure SimulateInstr2(curAdr:Integer; Op:Byte);
Procedure SimulateInstr2RegImm(curAdr:Integer; Op:Byte);
Procedure SimulateInstr2RegMem(curAdr:Integer; Op:Byte);
Procedure SimulateInstr2RegReg(curAdr:Integer; Op:Byte);
Procedure SimulateInstr2MemImm(curAdr:Integer; Op:Byte);
Procedure SimulateInstr2MemReg(curAdr:Integer; Op:Byte);
Procedure SimulateInstr3(curAdr:Integer; Op:Byte);
Procedure SimulatePop(curAdr:Integer);
Procedure SimulatePush(curAdr:Integer;bShowComment:Boolean);
Function SimulateSysCall(name:AnsiString; procAdr:Integer; instrLen:Integer):Boolean;
Function AnalyzeConditions(brType:Integer; curAdr, sAdr, jAdr:Integer; loopInfo:TLoopInfo;bFloat:Boolean):Integer;
end;
Implementation
Uses SysUtils,Misc,Main,Heuristic,StrUtils,Forms,Scanf;
Function GetString(item:PITEM;precedence:Byte):AnsiString;
Begin
Result:=item.Value;
if Result = '' then
begin
if IF_INTVAL in item.Flags then
Result:= GetImmString(item._Type, item.IntValue)
Else if item.Name <> '' then Result := item.Name;
end
Else if (item.Precedence<>0) and (item.Precedence < precedence) then Result:='(' + Result + ')';
end;
Function GetFieldName(fInfo:FieldInfo):AnsiString;
Begin
if fInfo.Name = '' then Result:='?f' + Val2Str(fInfo.Offset)
Else Result:=fInfo.Name;
end;
Function GetArgName(aInfo:PArgInfo):AnsiString;
Begin
if aInfo.Name = '' then Result:='arg_' + Val2Str(aInfo.Ndx)
else Result:=aInfo.Name;
end;
Function GetGVarName(adr:Integer):AnsiString;
var
recN:InfoRec;
Begin
if not IsValidImageAdr(adr) then Result:='?'
Else
begin
recN := GetInfoRec(adr);
if Assigned(recN) and recN.HasName then Result:=recN.Name
else Result:=MakeGvarName(adr);
end;
end;
Function GetDirectCondition(c:Char):AnsiString;
Begin
if c >= 'A' then Result:=DirectConditions[Ord(c) - Ord('A')]
else Result:='?';
end;
Function GetInvertCondition(c:Char):AnsiString;
Begin
if c >= 'A' then Result:=InvertConditions[Ord(c) - Ord('A')]
else Result:='?';
end;
Procedure InitItem(item:PItem);
Begin
with item^ Do
Begin
Flags:=[];
Precedence:=PRECEDENCE_ATOM;
Size:=0;
Offset:=0;
IntValue:=0;
Value:='';
Value1:='';
_Type:='';
Name:='';
end;
end;
procedure AssignItem(var dstItem,srcItem:TItem);
Begin
DstItem.Flags := SrcItem.Flags;
DstItem.Precedence := SrcItem.Precedence;
DstItem.Size := SrcItem.Size;
DstItem.IntValue := SrcItem.IntValue;
DstItem.Value := SrcItem.Value;
DstItem.Value1 := SrcItem.Value1;
DstItem._Type := SrcItem._Type;
DstItem.Name := SrcItem.Name;
end;
Constructor TNamer.Create;
Begin
MaxIdx:=-1;
Names:=TStringList.Create;
Names.Sorted:=True;
end;
Destructor TNamer.Destroy;
Begin
Names.Free;
Inherited;
end;
Function TNamer.MakeName (template:AnsiString):AnsiString;
Var
n,idx:Integer;
Begin
if template[1] = 'T' then
begin
idx := -1;
Result := '_'+template+'_';
for n := 0 to MaxIdx do
begin
Result:=Result+IntToStr(n);
if Names.IndexOf(Result) <> -1 then idx := n;
end;
if idx = -1 then
begin
Names.Add(Result);
if MaxIdx = -1 then MaxIdx := 0;
end
else
begin
Result:=Result+IntToStr(idx + 1);
Names.Add(Result);
if idx + 1 > MaxIdx then MaxIdx := idx + 1;
end;
End;
end;
Constructor TForInfo.Create (ANoVar, ADown:Boolean; AStopAdr:Integer; AFrom, ATo:AnsiString; AVarType:Byte; AVarIdx:Integer; ACntType:Byte; ACntIdx:Integer);
Begin
NoVar := ANoVar;
Down := ADown;
StopAdr := AStopAdr;
From := AFrom;
_To := ATo;
VarInfo.IdxType := AVarType;
VarInfo.IdxValue := AVarIdx;
CntInfo.IdxType := ACntType;
CntInfo.IdxValue := ACntIdx;
end;
Constructor TWhileInfo.Create (ANoCond:Boolean);
Begin
NoCondition:=ANoCond;
end;
Constructor TLoopInfo.Create (AKind:Char; AContAdr, ABreakAdr, ALastAdr:Integer);
Begin
Kind := AKind;
ContAdr := AContAdr;
BreakAdr := ABreakAdr;
LastAdr := ALastAdr;
forInfo := Nil;
whileInfo := Nil;
end;
constructor TDecompileEnv.Create(AStartAdr:Integer; ASize:Integer; recN:InfoRec);
Begin
StartAdr := AStartAdr;
Size := ASize;
StackSize := recN.procInfo.stackSize;
if StackSize=0 then StackSize := $8000;
SetLength(Stack,StackSize);
ErrAdr := 0;
Body := TStringList.Create;
Namer := TNamer.Create;
SavedContext := TList.Create;
BJLseq := TList.Create;
bjllist := TList.Create;
CmpStack := TList.Create;
Embedded := PF_EMBED in recN.procInfo.flags;
EmbeddedList := TStringList.Create;
BpBased := PF_BPBASED in recN.procInfo.flags;
LocBase := 0;
if not BpBased then LocBase := StackSize;
LastResString := '';
end;
Destructor TDecompileEnv.Destroy;
Begin
Stack:=Nil;
Body.Free;
Namer.Free;
SavedContext.Free;
BJLseq.Free;
BJLlist.Free;
CmpStack.Free;
EmbeddedList.Free;
Inherited;
end;
Function TDecompileEnv.GetLvarName (Ofs:Integer;Const _Type:AnsiString):AnsiString;
Var
locInfo:PLocalInfo;
_recN:InfoRec;
n:Integer;
Begin
Result:='lvar_' + Val2Str(LocBase - Ofs);
//Insert by ZGL
_recN := GetInfoRec(StartAdr);
if Assigned(_recN) and Assigned(_recN.procInfo) then
begin
if Assigned(_recN.procInfo.locals) then
begin
for n := 0 to _recN.procInfo.locals.Count-1 do
begin
locInfo := _recN.procInfo.locals[n];
if (locInfo.Ofs = Ofs) and (locInfo.Name <> '') Then //LocBase - Ofs
Begin
Result:=locInfo.Name;
Exit;
end;
end;
end;
locInfo := _recN.procInfo.AddLocal(Ofs, 1, Result, _Type);
end;
////////////////
end;
Function TDecompileEnv.GetContext (Adr:Integer):PDContext;
var
n:Integer;
Begin
for n := 0 to SavedContext.Count-1 do
begin
Result := SavedContext[n];
if Result.adr = Adr Then Exit;
end;
Result:=Nil;
end;
Procedure TDecompileEnv.SaveContext (Adr:Integer);
var
n:Integer;
ctx:PDContext;
Begin
if GetContext(Adr)=Nil then
begin
New(ctx);
ctx.adr := Adr;
for n := 0 to High(RegInfo) do
begin
ctx.gregs[n] := RegInfo[n];
ctx.fregs[n] := FStack[n];
end;
SavedContext.Add(ctx);
end;
end;
Procedure TDecompileEnv.RestoreContext (Adr:Integer);
var
n:Integer;
ctx:PDContext;
Begin
ctx := GetContext(Adr);
if Assigned(ctx) then
for n := 0 to High(RegInfo) do
begin
RegInfo[n] := ctx.gregs[n];
FStack[n] := ctx.fregs[n];
End;
end;
Constructor TDecompiler.Create (AEnv:TDecompileEnv);
Begin
Env:=AEnv;
SetLength(DeFlags,AEnv.Size + 1);
end;
Destructor TDecompiler.Destroy;
Begin
Stack:=Nil;
DeFlags:=Nil;
Inherited;
end;
Procedure TDecompiler.SetDeFlags (ASrc:Pointer);
Begin
MoveMemory(@DeFlags[0], ASrc, Env.Size + 1);
end;
Procedure TDecompiler.SetStop (Adr:Integer);
Begin
DeFlags[Adr - Env.StartAdr] := 1;
end;
Procedure TDecompiler.InitFlags;
var
n,_ap:Integer;
recN:InfoRec;
Begin
FillMemory(@DeFlags[0], Env.Size + 1,0);
_ap := Adr2Pos(Env.StartAdr);
for n := _ap to _ap + Env.Size do
begin
if IsFlagSet([cfLoc], n) then
begin
recN := GetInfoRec(Pos2Adr(n));
if Assigned(recN) then recN.counter := 0;
end;
ClearFlag([cfPass], n);
end;
end;
Procedure TDecompiler.ClearStop (Adr:Integer);
Begin
DeFlags[Adr - Env.StartAdr] := 0;
end;
Procedure TDecompiler.SetStackPointers (ASrc:TDecompiler);
Begin
_TOP_ := ASrc._TOP_;
_ESP_ := ASrc._ESP_;
end;
Procedure TDecompiler.SetRegItem (Idx:Integer; var val:TITEM);
Var
x:Integer;
Begin
if Idx >= 16 then
begin
x := Idx - 16;
Env.RegInfo[x].Size := 4;
end
else if Idx >= 8 then
begin
x := Idx - 8;
Env.RegInfo[x].Size := 2;
end
else if Idx >= 4 then
begin
x := Idx - 4;
Env.RegInfo[x].Size := 1;
end
else
begin
x := Idx;
Env.RegInfo[x].Size := 1;
end;
with Env.RegInfo[x] do
Begin
Flags := Val.Flags;
Precedence := Val.Precedence;
Offset := Val.Offset;
IntValue := Val.IntValue;
Value := Val.Value;
Value1 := Val.Value1;
_Type := Val._Type;
Name := Val.Name;
End;
end;
Procedure TDecompiler.GetRegItem (Idx:Integer; var Dst:TITEM);
var
x:Integer;
Begin
assert((Idx >= 0) and (Idx < 24));
if Idx >= 16 Then x := Idx - 16
else if Idx >= 8 then x := Idx - 8
else if Idx >= 4 then x := Idx - 4
else x := Idx;
With Env.RegInfo[x] do
begin
Dst.Flags := Flags;
Dst.Precedence := Precedence;
Dst.Size := Size;
Dst.Offset := Offset;
Dst.IntValue := IntValue;
Dst.Value := Value;
Dst.Value1 := Value1;
Dst._Type := _Type;
Dst.Name := Name;
End;
end;
Function TDecompiler.GetRegType (Idx:Integer):AnsiString;
Begin
if Idx >= 16 then Result:=Env.RegInfo[Idx - 16]._Type
Else if Idx >= 8 then Result:=Env.RegInfo[Idx - 8]._Type
Else if Idx >= 4 then Result:=Env.RegInfo[Idx - 4]._Type
Else Result:=Env.RegInfo[Idx]._Type;
end;
Procedure TDecompiler.Push (item:PITEM);
Begin
if _ESP_ < 4 then
begin
Env.ErrAdr := CurProcAdr;
Raise Exception.Create('Attempt to PUSH on full Stack!');
end;
Dec(_ESP_, 4);
Env.Stack[_ESP_]:=item^;
{
With Env.Stack[_ESP_] do
Begin
Flags := Item.Flags;
Precedence := Item.Precedence;
Size := Item.Size;
Offset := Item.Offset;
IntValue := Item.IntValue;
Value := Item.Value;
_Type := Item._Type;
Name := Item.Name;
end;
}
end;
Function TDecompiler.Pop:PItem;
Begin
if _ESP_ = Env.StackSize then
begin
Env.ErrAdr := CurProcAdr;
raise Exception.Create('Attempt to POP on empty Stack!');
End;
Result:= @Env.Stack[_ESP_];
Inc(_ESP_, 4);
end;
//Get val from ST(idx)
Function TDecompiler.FGet (idx:Integer):PItem;
Begin
Result:=@Env.FStack[(_TOP_ + idx) and 7];
end;
//Save val into ST(idx)
Procedure TDecompiler.FSet (idx:Integer; val:PITEM);
Begin
Env.FStack[(_TOP_ + idx) and 7] := val^;
{
With Env.FStack[(_TOP_ + idx) and 7] do
Begin
Flags := val.Flags;
Precedence := val.Precedence;
Size := val.Size;
Offset := val.Offset;
IntValue := val.IntValue;
Value := val.Value;
_Type := val._Type;
Name := val.Name;
End;
}
end;
//Xchange ST(idx1) and ST(idx2)
Procedure TDecompiler.FXch(idx1, idx2:Integer);
var
tmp:TItem;
item1,item2:PItem;
begin
item1 := FGet(idx1);
item2 := FGet(idx2);
tmp:=item1^;
item1^:=item2^;
item2^:=tmp;
{
tmp.Flags = _item1->Flags;
tmp.Precedence = _item1->Precedence;
tmp.Size = _item1->Size;
tmp.Offset = _item1->Offset;
tmp.IntValue = _item1->IntValue;
tmp.Value = _item1->Value;
tmp.Type = _item1->Type;
tmp.Name = _item1->Name;
_item1->Flags = _item2->Flags;
_item1->Precedence = _item2->Precedence;
_item1->Size = _item2->Size;
_item1->Offset = _item2->Offset;
_item1->IntValue = _item2->IntValue;
_item1->Value = _item2->Value;
_item1->Type = _item2->Type;
_item1->Name = _item2->Name;
_item2->Flags = _tmp.Flags;
_item2->Precedence = _tmp.Precedence;
_item2->Size = _tmp.Size;
_item2->Offset = _tmp.Offset;
_item2->IntValue = _tmp.IntValue;
_item2->Value = _tmp.Value;
_item2->Type = _tmp.Type;
_item2->Name = _tmp.Name;
}
end;
Procedure TDecompiler.FPush (val:PITEM);
Begin
_TOP_:=(_TOP_-1) and 7;
FSet(0, val);
end;
Function TDecompiler.FPop:PITEM;
Begin
Result:=FGet(0);
_TOP_:=(_TOP_+1) and 7;
end;
Function TDecompiler.CheckPrototype (ARec:InfoRec):Boolean;
var
n,argNum:Integer;
aInfo:PArgInfo;
Begin
Result:=False;
if Assigned(ARec.procInfo.args) then argNum := ARec.procInfo.args.Count
Else argNum:= 0;
for n := 0 to argNum-1 do
begin
aInfo := PArgInfo(ARec.procInfo.args[n]);
if aInfo.TypeDef = '' then Exit;
end;
if (ARec.kind = ikFunc) and (ARec._type = '') Then Exit;
Result:=True;
end;
Function TDecompiler.Init (fromAdr:Integer):Boolean;
var
kind:LKind;
retKind:LKind;
callKind:Byte;
n, argNum, ndx, rn, size:Integer;
fromPos:Integer;
recN:InfoRec;
aInfo:PArgInfo;
item:TItem;
retType,typeDef:AnsiString;
Begin
Result:=True;
retKind:=ikUnknown;
fromPos := Adr2Pos(fromAdr);
assert(fromPos >= 0);
//Imports not decompile
if IsFlagSet([cfImport], fromPos) then Exit;
recN := GetInfoRec(fromAdr);
if not CheckPrototype(recN) then
begin
Result:=false;
Exit;
end;
retType := recN._type;
//Check that function return type is given
if recN.kind = ikFunc then retKind := GetTypeKind(retType, size);
//Init registers
InitItem(@item);
for n := 16 to 23 do
SetRegItem(n, item);
//Init Env.Stack
_ESP_ := Env.StackSize;
//Init floating registers stack
_TOP_ := 0;
for n := 0 to 7 do
FSet(n, @item);
callKind := recN.procInfo.call_kind;
//Arguments
if Assigned(recN.procInfo.args) then argNum := recN.procInfo.args.Count
else argNum:= 0;
if callKind = 0 then //fastcall
Begin
ndx := 0;
for n := 0 to argNum-1 do
Begin
aInfo := PARGINFO(recN.procInfo.args[n]);
InitItem(@item);
item.Flags := [IF_ARG];
if aInfo.Tag = $22 then Include(item.Flags, IF_VAR);
kind:=GetTypeKind(aInfo.TypeDef,size);
item._Type := aInfo.TypeDef;
item.Name := GetArgName(aInfo);
item.Value := item.Name;
if (kind=ikFloat) and (aInfo.Tag <> $22) then
Begin
size := aInfo.Size;
while size<>0 do
Begin
Push(@item);
Dec(size, 4);
End;
continue;
End;
//eax, edx, ecx
if ndx in [0..2] then
Begin
if ndx<>0 then rn := 19 - ndx
else rn := 16;
SetRegItem(rn, item);
Inc(ndx);
End
else Push(@item);
End;
//ret value
if (retKind = ikLString) or (retKind = ikRecord) then
Begin
InitItem(@item);
item.Flags := [IF_ARG, IF_VAR];
item._Type := retType;
item.Name := 'Result';
item.Value := item.Name;
//eax, edx, ecx
if ndx in [0..2] then
Begin
if ndx<>0 then rn := 19 - ndx
else rn := 16;
SetRegItem(rn, item);
//Inc(_ndx); not used
End
else Push(@item);
End;
End
else if (callKind = 3) or (callKind = 1) then //stdcall, cdecl
Begin
//Arguments in reverse order
for n := argNum - 1 downto 0 do
Begin
aInfo := PARGINFO(recN.procInfo.args[n]);
InitItem(@item);
item.Flags := [IF_ARG];
if aInfo.Tag = $22 then Include(item.Flags, IF_VAR);
item._Type := aInfo.TypeDef;
item.Name := GetArgName(aInfo);
item.Value := item.Name;
Push(@item);
End;
End
else if callKind = 2 then //pascal
for n := 0 to argNum-1 do
Begin
aInfo := PARGINFO(recN.procInfo.args[n]);
InitItem(@item);
item.Flags := [IF_ARG];
if aInfo.Tag = $22 then Include(item.Flags, IF_VAR);
item._Type := aInfo.TypeDef;
item.Name := GetArgName(aInfo);
item.Value := item.Name;
Push(@item);
End;
//Push ret address
InitItem(@item);
Push(@item);
{ removed by Crypto
Env.BpBased := PF_BPBASED in recN.procInfo.flags;
Env.LocBase := 0;
if not Env.BpBased then Env.LocBase := _ESP_;
Env.LastResString := '';
}
end;
Procedure TDecompileEnv.OutputSourceCodeLine (line:AnsiString);
Begin
FMain.lbSourceCode.Items.Add(StringOfChar(' ',TAB_SIZE*Indent)+line);
end;
Procedure TDecompileEnv.OutputSourceCode;
var
_end:Boolean;
line, nextline:AnsiString;
n:Integer;
Begin
Alarm := False;
FMain.lbSourceCode.Clear;
Indent := 0;
for n := 0 to Body.Count-1 do
begin
line := Body[n];
if n < Body.Count - 1 Then nextline := Body[n + 1]
else nextline := '';
if (line <> '') and (line[1] = '/') and (Pos('??? And ???',line)<>0) Then Alarm := True;
if SameText(line, 'begin') Or
SameText(line, 'try') Or
SameText(line, 'repeat') or
(Pos('case ',line) > 0) then
begin
if SameText(line, 'begin') then line:=line + '// ' + IntToStr(Indent);
OutputSourceCodeLine(line);
Inc(Indent);
continue;
end
Else if SameText(line, 'finally') or SameText(line, 'except') then
begin
Dec(Indent);
if Indent < 0 then Indent := 0;
line:=line + '// ' + IntToStr(Indent);
OutputSourceCodeLine(line);
Inc(Indent);
continue;
end
Else if SameText(line, 'end') or SameText(line, 'until') then
begin
_end := SameText(line, 'end');
Dec(Indent);
if Indent < 0 then Indent := 0;
if not SameText(nextline, 'else') then line:=line + ';';
if _end then line:=line + '// ' + IntToStr(Indent);
OutputSourceCodeLine(line);
continue;
end;
OutputSourceCodeLine(line);
End;
end;
//Embedded???
Procedure TDecompileEnv.DecompileProc;
var
de:TDecompiler;
recN:InfoRec;
locInfo:PLocalInfo;
n:Integer;
Begin
EmbeddedList.Clear;
De := TDecompiler.Create(Self);
try
if not De.Init(StartAdr) then
begin
Raise Exception.Create('Procedure Prototype is not completed');
end;
De.InitFlags;
De.SetStop(StartAdr + Size);
//add prototype
recN := GetInfoRec(StartAdr);
ProcName := recN.Name;
AddToBody(recN.MakePrototype(StartAdr, true, false, false, true, false));
//add vars -- Insert by ZGL
if Assigned(recN.procInfo.locals) and (recN.procInfo.locals.Count > 0) then
begin
for n := 0 to recN.procInfo.locals.Count-1 do
begin
locInfo := recN.procInfo.locals[n];
GetLvarName(locInfo.Ofs, locInfo.TypeDef);
End;
end;
if Assigned(recN.procInfo.locals) and (recN.procInfo.locals.Count > 0) then
begin
AddToBody('var');
for n := 0 to recN.procInfo.locals.Count-1 do
begin
locInfo := recN.procInfo.locals[n];
AddToBody(' ' + GetLvarName(locInfo.Ofs, locInfo.TypeDef) + ':' + locInfo.TypeDef + ';');
end;
end;
///////////////////////////
AddToBody('begin');
if StartAdr <> EP then
begin
if recN.kind = ikConstructor then
De.Decompile(StartAdr, [CF_CONSTRUCTOR], Nil)
else if recN.kind = ikDestructor then
De.Decompile(StartAdr, [CF_DESTRUCTOR], Nil)
else De.Decompile(StartAdr, [], Nil);
end
else De.Decompile(StartAdr, [], Nil);
AddToBody('end');
Finally
De.Free;
End;
end;
Function TDecompileEnv.GetBJLRange (fromAdr:Integer; Var bodyBegAdr, bodyEndAdr, jmpAdr:Integer; loopInfo:TLoopInfo):Boolean;
var
_curPos, _instrLen, brType:Integer;
_curAdr, _jmpAdr:Integer;
disInfo:TDisInfo;
Begin
Result:=False;
bodyEndAdr := 0;
jmpAdr := 0;
_curPos := Adr2Pos(fromAdr);
assert(_curPos >= 0);
_curAdr := fromAdr;
while true do
begin
if _curAdr = bodyBegAdr then break;
_instrLen := frmDisasm.Disassemble(Code + _curPos, _curAdr, @disInfo, Nil);
Inc(_curPos, _instrLen);
Inc(_curAdr, _instrLen);
if disInfo.Branch then
begin
if IsFlagSet([cfSkip], _curPos - _instrLen) then continue;
if not disInfo.Conditional then Exit;
brType := BranchGetPrevInstructionType(disInfo.Immediate, _jmpAdr, loopInfo);
Case brType of
1: //jcc down
if disInfo.Immediate > bodyBegAdr then
begin
bodyBegAdr := disInfo.Immediate;
continue;
end;
0,3: //simple if or jmp down
if disInfo.Immediate > bodyEndAdr then
begin
bodyEndAdr := disInfo.Immediate;
if brType = 3 then jmpAdr := _jmpAdr;
continue;
end;
2: //jcc up
//if disInfo.Immediate > fromAdr then Exit;
if bodyEndAdr = 0 then
bodyEndAdr := disInfo.Immediate
else if bodyEndAdr <> disInfo.Immediate then
Raise Exception.Create('GetBJLRange: unknown situation');
4: //jmp up
Exit;
end;
end;
End;
Result:=true;
end;
Procedure TDecompileEnv.CreateBJLSequence (fromAdr, bodyBegAdr, bodyEndAdr:Integer);
var
found:Boolean;
b:Byte;
i, j, m, curPos, instrLen:Integer;
curAdr, adr:Integer;
bjl_0, bjl_1, bjl_2:PBJL;
bjlInfo_0, bjlInfo_1, bjlInfo_2:PBJLInfo;
disInfo:TDisInfo;
Begin
BJLnum := 0;
bjllist.Clear;
BJLseq.Clear;
curPos := Adr2Pos(fromAdr);
assert(curPos >= 0);
curAdr := fromAdr;
while true do
Begin
if curAdr = bodyBegAdr then
Begin
New(bjl_0);
bjl_0.branch := false;
bjl_0.loc := true;
bjl_0._type := BJL_LOC;
bjl_0.address := bodyBegAdr;
bjl_0.idx := 0;
bjllist.Add(bjl_0);
New(bjlInfo_0);
bjlInfo_0.state := 'L';
bjlInfo_0.bcnt := 0;