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Decompiler.cpp
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//---------------------------------------------------------------------------
#include <vcl.h>
#include <StrUtils.hpp>
#pragma hdrstop
#include <assert>
#include "Decompiler.h"
#include "Main.h"
#include "Misc.h"
#include "TypeInfo.h"
#include "InputDlg.h"
//---------------------------------------------------------------------------
extern int DelphiVersion;
extern MDisasm Disasm;
extern DWORD CodeBase;
extern DWORD CurProcAdr;
extern DWORD EP;
extern DWORD ImageBase;
extern BYTE *Image;
extern BYTE *Code;
extern PInfoRec *Infos;
extern TStringList *BSSInfos;
extern DWORD *Flags;
extern int cVmtSelfPtr;
extern char StringBuf[MAXSTRBUFFER];
extern MKnowledgeBase KnowledgeBase;
//---------------------------------------------------------------------------
String __fastcall GetString(PITEM item, BYTE precedence)
{
String _val = item->Value;
if (_val == "")
{
if (item->Flags & IF_INTVAL)
return GetImmString(item->Type, item->IntValue);
if (item->Name != "")
_val = item->Name;
}
if (item->Precedence && item->Precedence < precedence) return "(" + _val + ")";
return _val;
}
//---------------------------------------------------------------------------
String __fastcall GetFieldName(PFIELDINFO fInfo)
{
if (fInfo->Name == "") return String("?f") + Val2Str0(fInfo->Offset);
return fInfo->Name;
}
//---------------------------------------------------------------------------
String __fastcall GetArgName(PARGINFO argInfo)
{
if (argInfo->Name == "") return String("arg_") + Val2Str0(argInfo->Ndx);
return argInfo->Name;
}
//---------------------------------------------------------------------------
String __fastcall GetGvarName(DWORD adr)
{
if (!IsValidImageAdr(adr)) return "?";
PInfoRec recN = GetInfoRec(adr);
if (recN && recN->HasName()) return recN->GetName();
return MakeGvarName(adr);
}
//---------------------------------------------------------------------------
//'A'-JO;'B'-JNO;'C'-JB;'D'-JNB;'E'-JZ;'F'-JNZ;'G'-JBE;'H'-JA;
//'I'-JS;'J'-JNS;'K'-JP;'L'-JNP;'M'-JL;'N'-JGE;'O'-JLE;'P'-JG
//'Q'-in;'R'-not in;'S'-is
String DirectConditions[19] = {"", "", "<", ">=", "=", "<>", "<=", ">", "", "", "", "", "<", ">=", "<=", ">", "not in", "in", "is"};
String __fastcall GetDirectCondition(char c)
{
if (c >= 'A')
return DirectConditions[c - 'A'];
else
return "?";
}
//---------------------------------------------------------------------------
String InvertConditions[19] = {"", "", ">=", "<", "<>", "=", ">", "<=", "", "", "", "", ">=", "<", ">", "<=", "in", "not in", "is not"};
String __fastcall GetInvertCondition(char c)
{
if (c >= 'A')
return InvertConditions[c - 'A'];
else
return "?";
}
//---------------------------------------------------------------------------
void __fastcall InitItem(PITEM Item)
{
Item->Flags = 0;
Item->Precedence = PRECEDENCE_ATOM;
Item->Size = 0;
Item->Offset = 0;
Item->IntValue = 0;
Item->Value = "";
Item->Value1 = "";
Item->Type = "";
Item->Name = "";
}
//---------------------------------------------------------------------------
void __fastcall AssignItem(PITEM DstItem, PITEM SrcItem)
{
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;
}
//---------------------------------------------------------------------------
__fastcall TNamer::TNamer()
{
MaxIdx = -1;
Names = new TStringList;
Names->Sorted = true;
}
//---------------------------------------------------------------------------
__fastcall TNamer::~TNamer()
{
delete Names;
}
//---------------------------------------------------------------------------
String __fastcall TNamer::MakeName(String shablon)
{
char name[1024];
if (shablon[1] == 'T')
{
int idx = -1;
int len = sprintf(name, "_%s_", shablon.c_str() + 1);
for (int n = 0; n <= MaxIdx; n++)
{
sprintf(name + len, "%d", n);
if (Names->IndexOf(String(name)) != -1) idx = n;
}
if (idx == -1)
{
Names->Add(String(name));
if (MaxIdx == -1) MaxIdx = 0;
}
else
{
sprintf(name + len, "%d", idx + 1);
Names->Add(String(name));
if (idx + 1 > MaxIdx) MaxIdx = idx + 1;
}
}
return String(name);
}
//---------------------------------------------------------------------------
__fastcall TForInfo::TForInfo(bool ANoVar, bool ADown, int AStopAdr, String AFrom, String ATo, BYTE AVarType, int AVarIdx, BYTE ACntType, int ACntIdx)
{
NoVar = ANoVar;
Down = ADown;
StopAdr = AStopAdr;
From = AFrom;
To = ATo;
VarInfo.IdxType = AVarType;
VarInfo.IdxValue = AVarIdx;
CntInfo.IdxType = ACntType;
CntInfo.IdxValue = ACntIdx;
}
//---------------------------------------------------------------------------
__fastcall TWhileInfo::TWhileInfo(bool ANoCond)
{
NoCondition = ANoCond;
}
//---------------------------------------------------------------------------
__fastcall TLoopInfo::TLoopInfo(BYTE AKind, DWORD AContAdr, DWORD ABreakAdr, DWORD ALastAdr)
{
Kind = AKind;
ContAdr = AContAdr;
BreakAdr = ABreakAdr;
LastAdr = ALastAdr;
forInfo = 0;
whileInfo = 0;
}
//---------------------------------------------------------------------------
__fastcall TLoopInfo::~TLoopInfo()
{
}
//---------------------------------------------------------------------------
__fastcall TDecompileEnv::TDecompileEnv(DWORD AStartAdr, int ASize, PInfoRec recN)
{
StartAdr = AStartAdr;
Size = ASize;
StackSize = recN->procInfo->stackSize;
if (!StackSize) StackSize = 0x8000;
Stack = new ITEM[StackSize];
ErrAdr = 0;
Body = new TStringList;
Namer = new TNamer;
SavedContext = new TList;
BJLseq = new TList;
bjllist = new TList;
CmpStack = new TList;
Embedded = (recN->procInfo->flags & PF_EMBED);
EmbeddedList = new TStringList;
BpBased = recN->procInfo->flags & PF_BPBASED;
LocBase = 0;
if (!BpBased) LocBase = StackSize;
LastResString = "";
}
//---------------------------------------------------------------------------
__fastcall TDecompileEnv::~TDecompileEnv()
{
if (Stack) delete[] Stack;
if (Body) delete Body;
if (Namer) delete Namer;
if (SavedContext) delete SavedContext;
if (BJLseq) delete BJLseq;
if (bjllist) delete bjllist;
if (CmpStack) delete CmpStack;
if (EmbeddedList) delete EmbeddedList;
}
//---------------------------------------------------------------------------
String __fastcall TDecompileEnv::GetLvarName(int Ofs, String Type)
{
PLOCALINFO locInfo;
String _defaultName = String("lvar_") + Val2Str0(LocBase - Ofs);
//Insert by ZGL
PInfoRec _recN = GetInfoRec(StartAdr);
if (_recN && _recN->procInfo)
{
if (_recN->procInfo->locals)
{
for (int n = 0; n < _recN->procInfo->locals->Count; n++)
{
locInfo = PLOCALINFO(_recN->procInfo->locals->Items[n]);
if (locInfo->Ofs == Ofs && locInfo->Name != "")//LocBase - Ofs
return locInfo->Name;
}
}
locInfo = _recN->procInfo->AddLocal(Ofs, 1, _defaultName, Type);
}
////////////////
return _defaultName;
}
//---------------------------------------------------------------------------
PDCONTEXT __fastcall TDecompileEnv::GetContext(DWORD Adr)
{
int n;
PDCONTEXT ctx;
for (n = 0; n < SavedContext->Count; n++)
{
ctx = (PDCONTEXT)SavedContext->Items[n];
if (ctx->adr == Adr) return ctx;
}
return 0;
}
//---------------------------------------------------------------------------
void __fastcall TDecompileEnv::SaveContext(DWORD Adr)
{
int n;
PDCONTEXT ctx;
if (!GetContext(Adr))
{
ctx = new DCONTEXT;
ctx->adr = Adr;
for (n = 0; n < 8; n++)
{
ctx->gregs[n] = RegInfo[n];
ctx->fregs[n] = FStack[n];
}
SavedContext->Add((void*)ctx);
}
}
//---------------------------------------------------------------------------
void __fastcall TDecompileEnv::RestoreContext(DWORD Adr)
{
int n;
PDCONTEXT ctx;
ctx = GetContext(Adr);
if (ctx)
{
for (n = 0; n < 8; n++)
{
RegInfo[n] = ctx->gregs[n];
FStack[n] = ctx->fregs[n];
}
}
}
//---------------------------------------------------------------------------
__fastcall TDecompiler::TDecompiler(TDecompileEnv* AEnv)
{
WasRet = false;
Env = AEnv;
Stack = 0;
DeFlags = new BYTE[AEnv->Size + 1];
}
//---------------------------------------------------------------------------
__fastcall TDecompiler::~TDecompiler()
{
if (Stack) delete[] Stack;
if (DeFlags) delete DeFlags;
}
//---------------------------------------------------------------------------
void __fastcall TDecompiler::SetDeFlags(BYTE* ASrc)
{
memmove(DeFlags, ASrc, Env->Size + 1);
}
//---------------------------------------------------------------------------
void __fastcall TDecompiler::SetStop(DWORD Adr)
{
DeFlags[Adr - Env->StartAdr] = 1;
}
//---------------------------------------------------------------------------
void __fastcall TDecompiler::InitFlags()
{
memset(DeFlags, 0, Env->Size + 1);
int _ap = Adr2Pos(Env->StartAdr);
for (int n = _ap; n < _ap + Env->Size + 1; n++)
{
if (IsFlagSet(cfLoc, n))
{
PInfoRec recN = GetInfoRec(Pos2Adr(n));
if (recN) recN->counter = 0;
}
ClearFlag(cfPass, n);
}
}
//---------------------------------------------------------------------------
void __fastcall TDecompiler::ClearStop(DWORD Adr)
{
DeFlags[Adr - Env->StartAdr] = 0;
}
//---------------------------------------------------------------------------
void __fastcall TDecompiler::SetStackPointers(TDecompiler* ASrc)
{
_TOP_ = ASrc->_TOP_;
_ESP_ = ASrc->_ESP_;
}
//---------------------------------------------------------------------------
void __fastcall TDecompiler::SetRegItem(int Idx, PITEM Val)
{
int _idx;
if (Idx >= 16)
{
_idx = Idx - 16;
Env->RegInfo[_idx].Size = 4;
}
else if (Idx >= 8)
{
_idx = Idx - 8;
Env->RegInfo[_idx].Size = 2;
}
else if (Idx >= 4)
{
_idx = Idx - 4;
Env->RegInfo[_idx].Size = 1;
}
else
{
_idx = Idx;
Env->RegInfo[_idx].Size = 1;
}
Env->RegInfo[_idx].Flags = Val->Flags;
Env->RegInfo[_idx].Precedence = Val->Precedence;
Env->RegInfo[_idx].Offset = Val->Offset;
Env->RegInfo[_idx].IntValue = Val->IntValue;
Env->RegInfo[_idx].Value = Val->Value;
Env->RegInfo[_idx].Value1 = Val->Value1;
Env->RegInfo[_idx].Type = Val->Type;
Env->RegInfo[_idx].Name = Val->Name;
}
//---------------------------------------------------------------------------
void __fastcall TDecompiler::GetRegItem(int Idx, PITEM Dst)
{
int _idx;
assert(Idx >= 0 && Idx < 24);
if (Idx >= 16)
_idx = Idx - 16;
else if (Idx >= 8)
_idx = Idx - 8;
else if (Idx >= 4)
_idx = Idx - 4;
else
_idx = Idx;
PITEM _src = &Env->RegInfo[_idx];
Dst->Flags = _src->Flags;
Dst->Precedence = _src->Precedence;
Dst->Size = _src->Size;
Dst->Offset = _src->Offset;
Dst->IntValue = _src->IntValue;
Dst->Value = _src->Value;
Dst->Value1 = _src->Value1;
Dst->Type = _src->Type;
Dst->Name = _src->Name;
}
//---------------------------------------------------------------------------
String __fastcall TDecompiler::GetRegType(int Idx)
{
if (Idx >= 16) return Env->RegInfo[Idx - 16].Type;
if (Idx >= 8) return Env->RegInfo[Idx - 8].Type;
if (Idx >= 4) return Env->RegInfo[Idx - 4].Type;
return Env->RegInfo[Idx].Type;
}
//---------------------------------------------------------------------------
void __fastcall TDecompiler::Push(PITEM Item)
{
if (_ESP_ < 4)
{
Env->ErrAdr = CurProcAdr;
throw Exception("Stack!");
}
_ESP_ -= 4;
Env->Stack[_ESP_] = *Item;
/*
Env->Stack[_ESP_].Flags = Item->Flags;
Env->Stack[_ESP_].Precedence = Item->Precedence;
Env->Stack[_ESP_].Size = Item->Size;
Env->Stack[_ESP_].Offset = Item->Offset;
Env->Stack[_ESP_].IntValue = Item->IntValue;
Env->Stack[_ESP_].Value = Item->Value;
Env->Stack[_ESP_].Type = Item->Type;
Env->Stack[_ESP_].Name = Item->Name;
*/
}
//---------------------------------------------------------------------------
PITEM __fastcall TDecompiler::Pop()
{
if (_ESP_ == Env->StackSize)
{
Env->ErrAdr = CurProcAdr;
throw Exception("Stack!");
}
PITEM _item = &Env->Stack[_ESP_];
_ESP_ += 4;
return _item;
}
//---------------------------------------------------------------------------
//Get val from ST(idx)
PITEM __fastcall TDecompiler::FGet(int idx)
{
PITEM _item = &Env->FStack[(_TOP_ + idx) & 7];
return _item;
}
//---------------------------------------------------------------------------
//Save val into ST(idx)
void __fastcall TDecompiler::FSet(int idx, PITEM val)
{
int n = (_TOP_ + idx) & 7;
Env->FStack[n] = *val;
/*
Env->FStack[n].Flags = val->Flags;
Env->FStack[n].Precedence = val->Precedence;
Env->FStack[n].Size = val->Size;
Env->FStack[n].Offset = val->Offset;
Env->FStack[n].IntValue = val->IntValue;
Env->FStack[n].Value = val->Value;
Env->FStack[n].Type = val->Type;
Env->FStack[n].Name = val->Name;
*/
}
//---------------------------------------------------------------------------
//Xchange ST(idx1) and ST(idx2)
void __fastcall TDecompiler::FXch(int idx1, int idx2)
{
ITEM _tmp;
PITEM _item1 = FGet(idx1);
PITEM _item2 = FGet(idx2);
_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;
}
//---------------------------------------------------------------------------
void __fastcall TDecompiler::FPush(PITEM val)
{
_TOP_--;
_TOP_ &= 7;
FSet(0, val);
}
//---------------------------------------------------------------------------
PITEM __fastcall TDecompiler::FPop()
{
PITEM _item = FGet(0);
_TOP_++;
_TOP_ &= 7;
return _item;
}
//---------------------------------------------------------------------------
bool __fastcall TDecompiler::CheckPrototype(PInfoRec ARec)
{
int n, _argsNum;
PARGINFO _argInfo;
_argsNum = (ARec->procInfo->args) ? ARec->procInfo->args->Count : 0;
for (n = 0; n < _argsNum; n++)
{
_argInfo = (PARGINFO)ARec->procInfo->args->Items[n];
if (_argInfo->TypeDef == "") return false;
}
if (ARec->kind == ikFunc && ARec->type == "") return false;
return true;
}
//---------------------------------------------------------------------------
bool __fastcall TDecompiler::Init(DWORD fromAdr)
{
BYTE _kind, _retKind = 0, _callKind;
int n, _pos, _argsNum, _ndx, _rn, _size;
int _fromPos;
PInfoRec _recN, _recN1;
PARGINFO _argInfo;
ITEM _item;
String _retType, _typeDef;
_fromPos = Adr2Pos(fromAdr); assert(_fromPos >= 0);
//Imports not decompile
if (IsFlagSet(cfImport, _fromPos)) return true;
_recN = GetInfoRec(fromAdr);
if (!CheckPrototype(_recN)) return false;
_retType = _recN->type;
//Check that function return type is given
if (_recN->kind == ikFunc) _retKind = GetTypeKind(_retType, &_size);
//Init registers
InitItem(&_item);
for (n = 16; n < 24; n++)
{
SetRegItem(n, &_item);
}
//Init Env->Stack
_ESP_ = Env->StackSize;
//Init floating registers stack
_TOP_ = 0;
for (n = 0; n < 8; n++)
{
FSet(n, &_item);
}
_callKind = _recN->procInfo->flags & 7;
//Arguments
_argsNum = (_recN->procInfo->args) ? _recN->procInfo->args->Count : 0;
if (_callKind == 0)//fastcall
{
_ndx = 0;
for (n = 0; n < _argsNum; n++)
{
_argInfo = (PARGINFO)_recN->procInfo->args->Items[n];
InitItem(&_item);
_item.Flags = IF_ARG;
if (_argInfo->Tag == 0x22) _item.Flags |= IF_VAR;
_kind = GetTypeKind(_argInfo->TypeDef, &_size);
_item.Type = _argInfo->TypeDef;
_item.Name = GetArgName(_argInfo);
_item.Value = _item.Name;
if (_kind == ikFloat && _argInfo->Tag != 0x22)
{
_size = _argInfo->Size;
while (_size)
{
Push(&_item);
_size -= 4;
}
continue;
}
//eax, edx, ecx
if (_ndx >= 0 && _ndx <= 2)
{
if (_ndx)
_rn = 19 - _ndx;
else
_rn = 16;
SetRegItem(_rn, &_item);
_ndx++;
}
else
Push(&_item);
}
//ret value
if (_retKind == ikLString || _retKind == ikRecord)
{
InitItem(&_item);
_item.Flags = IF_ARG | IF_VAR;
_item.Type = _retType;
_item.Name = "Result";
_item.Value = _item.Name;
//eax, edx, ecx
if (_ndx >= 0 && _ndx <= 2)
{
if (_ndx)
_rn = 19 - _ndx;
else
_rn = 16;
SetRegItem(_rn, &_item);
_ndx++;
}
else
Push(&_item);
}
}
else if (_callKind == 3 || _callKind == 1)//stdcall, cdecl
{
//Arguments in reverse order
for (n = _argsNum - 1; n >= 0; n--)
{
_argInfo = (PARGINFO)_recN->procInfo->args->Items[n];
InitItem(&_item);
_item.Flags = IF_ARG;
if (_argInfo->Tag == 0x22) _item.Flags |= IF_VAR;
_item.Type = _argInfo->TypeDef;
_item.Name = GetArgName(_argInfo);
_item.Value = _item.Name;
Push(&_item);
}
}
else if (_callKind == 2)//pascal
{
for (n = 0; n < _argsNum; n++)
{
_argInfo = (PARGINFO)_recN->procInfo->args->Items[n];
InitItem(&_item);
_item.Flags = IF_ARG;
if (_argInfo->Tag == 0x22) _item.Flags |= IF_VAR;
_item.Type = _argInfo->TypeDef;
_item.Name = GetArgName(_argInfo);
_item.Value = _item.Name;
Push(&_item);
}
}
//Push ret address
InitItem(&_item);
Push(&_item);
//Env->BpBased = _recN->procInfo->flags & PF_BPBASED;
//Env->LocBase = 0;
//if (!Env->BpBased) Env->LocBase = _ESP_;
//Env->LastResString = "";
return true;
}
//---------------------------------------------------------------------------
void __fastcall TDecompileEnv::OutputSourceCodeLine(String line)
{
int spaceNum = TAB_SIZE * Indent;
memset(StringBuf, ' ', spaceNum);
int len = sprintf(StringBuf + spaceNum, "%s", line.c_str());
FMain_11011981->lbSourceCode->Items->Add(String(StringBuf));
}
//---------------------------------------------------------------------------
void __fastcall TDecompileEnv::OutputSourceCode()
{
bool _end;
String line, nextline;
Alarm = False;
FMain_11011981->lbSourceCode->Clear(); Indent = 0;
for (int n = 0; n < Body->Count; n++)
{
line = Body->Strings[n];
if (n < Body->Count - 1)
nextline = Body->Strings[n + 1];
else
nextline = "";
if (line != "" && line[1] == '/' && line.Pos("??? And ???")) Alarm = True;
if (SameText(line, "begin") || SameText(line, "try") || SameText(line, "repeat") || line.Pos("case ") > 0)
{
if (SameText(line, "begin")) line += "//" + String(Indent);
OutputSourceCodeLine(line);
Indent++;
continue;
}
if (SameText(line, "finally") || SameText(line, "except"))
{
Indent--;
if (Indent < 0) Indent = 0;
line += "//" + String(Indent);
OutputSourceCodeLine(line);
Indent++;
continue;
}
if (SameText(line, "end") || SameText(line, "until"))
{
_end = SameText(line, "end");
Indent--;
if (Indent < 0)Indent = 0;
if (!SameText(nextline, "else")) line += ";";
if (_end) line += "//" + String(Indent);
OutputSourceCodeLine(line);
continue;
}
OutputSourceCodeLine(line);
}
}
//---------------------------------------------------------------------------
//Embedded???
void __fastcall TDecompileEnv::DecompileProc()
{
EmbeddedList->Clear();
TDecompiler* De = new TDecompiler(this);
if (!De->Init(StartAdr))
{
delete De;
throw Exception("Prototype is not completed");
}
De->InitFlags();
De->SetStop(StartAdr + Size);
//add prototype
PInfoRec _recN = GetInfoRec(StartAdr);
ProcName = _recN->GetName();
AddToBody(_recN->MakePrototype(StartAdr, true, false, false, true, false));
//add vars -- Insert by ZGL
if (_recN->procInfo->locals && _recN->procInfo->locals->Count > 0)
{
for (int n = 0; n < _recN->procInfo->locals->Count; n++)
{
PLOCALINFO locInfo = PLOCALINFO(_recN->procInfo->locals->Items[n]);
GetLvarName(locInfo->Ofs, locInfo->TypeDef);
}
}
if (_recN->procInfo->locals && _recN->procInfo->locals->Count > 0)
{
AddToBody("var");
for (int n = 0; n < _recN->procInfo->locals->Count; n++)
{
PLOCALINFO locInfo = PLOCALINFO(_recN->procInfo->locals->Items[n]);
String line = " " + GetLvarName(locInfo->Ofs, locInfo->TypeDef) + ":" + locInfo->TypeDef + ";";
AddToBody(line);
}
}
///////////////////////////
AddToBody("begin");
if (StartAdr != EP)
{
if (_recN->kind == ikConstructor)
De->Decompile(StartAdr, CF_CONSTRUCTOR, 0);
else if (_recN->kind == ikDestructor)
De->Decompile(StartAdr, CF_DESTRUCTOR, 0);
else
De->Decompile(StartAdr, 0, 0);
}
else
{
De->Decompile(StartAdr, 0, 0);
}
AddToBody("end");
delete De;
}
//---------------------------------------------------------------------------
//BJL
bool __fastcall TDecompileEnv::GetBJLRange(DWORD fromAdr, DWORD* bodyBegAdr, DWORD* bodyEndAdr, DWORD* jmpAdr, PLoopInfo loopInfo)
{
BYTE _op;
int _curPos, _instrLen, _brType;
DWORD _curAdr, _jmpAdr;
DISINFO _disInfo;
*bodyEndAdr = 0;
*jmpAdr = 0;
_curPos = Adr2Pos(fromAdr);
assert(_curPos >= 0);
_curAdr = fromAdr;
while (1)
{
if (_curAdr == *bodyBegAdr) break;
_instrLen = Disasm.Disassemble(Code + _curPos, (__int64)_curAdr, &_disInfo, 0);
_curPos += _instrLen; _curAdr += _instrLen;
if (_disInfo.Branch)
{
if (IsFlagSet(cfSkip, _curPos - _instrLen)) continue;
if (!_disInfo.Conditional) return false;
_brType = BranchGetPrevInstructionType(_disInfo.Immediate, &_jmpAdr, loopInfo);
//jcc down
if (_brType == 1)
{
if (_disInfo.Immediate > *bodyBegAdr)
{
*bodyBegAdr = _disInfo.Immediate;
continue;
}
}
//simple if or jmp down
if (_brType == 0 || _brType == 3)
{
if (_disInfo.Immediate > *bodyEndAdr)
{
*bodyEndAdr = _disInfo.Immediate;
if (_brType == 3) *jmpAdr = _jmpAdr;
continue;
}
}
//jcc up
if (_brType == 2)
{
//if (_disInfo.Immediate > fromAdr) return false;
if (*bodyEndAdr == 0)
*bodyEndAdr = _disInfo.Immediate;
else if (*bodyEndAdr != _disInfo.Immediate)
throw Exception("GetBJLRange: unknown situation");
}
//jmp up
if (_brType == 4) return false;
}
}
return true;
}
//---------------------------------------------------------------------------
void __fastcall TDecompileEnv::CreateBJLSequence(DWORD fromAdr, DWORD bodyBegAdr, DWORD bodyEndAdr)
{
bool found;
BYTE _b;
int i, j, m, _curPos, _instrLen;
DWORD _curAdr, _adr;
PInfoRec _recN;
TBJL *_bjl, *_bjl1, *_bjl2;
TBJLInfo *_bjlInfo, *_bjlInfo1, *_bjlInfo2;
DISINFO _disInfo;
BJLnum = 0;
bjllist->Clear();
BJLseq->Clear();
_curPos = Adr2Pos(fromAdr); assert(_curPos >= 0);
_curAdr = fromAdr;
while (1)
{
if (_curAdr == bodyBegAdr)
{
_bjl = new TBJL;
_bjl->branch = false;
_bjl->loc = true;
_bjl->type = BJL_LOC;
_bjl->address = bodyBegAdr;
_bjl->idx = 0;
bjllist->Add((void*)_bjl);
_bjlInfo = new TBJLInfo;
_bjlInfo->state = 'L';
_bjlInfo->bcnt = 0;
_bjlInfo->address = bodyBegAdr;
_bjlInfo->dExpr = "";
_bjlInfo->iExpr = "";
BJLseq->Add((void*)_bjlInfo);
_bjl = new TBJL;
_bjl->branch = false;
_bjl->loc = true;
_bjl->type = BJL_LOC;
_bjl->address = bodyEndAdr;
_bjl->idx = 0;
bjllist->Add((void*)_bjl);
_bjlInfo = new TBJLInfo;
_bjlInfo->state = 'L';
_bjlInfo->bcnt = 0;
_bjlInfo->address = bodyEndAdr;
_bjlInfo->dExpr = "";
_bjlInfo->iExpr = "";
BJLseq->Add((void*)_bjlInfo);
break;
}
if (IsFlagSet(cfLoc, _curPos))
{
_bjl = new TBJL;
_bjl->branch = false;
_bjl->loc = true;
_bjl->type = BJL_LOC;
_bjl->address = _curAdr;
_bjl->idx = 0;
bjllist->Add((void*)_bjl);
_bjlInfo = new TBJLInfo;
_bjlInfo->state = 'L';
_bjlInfo->bcnt = 0;
_bjlInfo->address = _curAdr;
_bjlInfo->dExpr = "";
_bjlInfo->iExpr = "";
BJLseq->Add((void*)_bjlInfo);
}
_instrLen = Disasm.Disassemble(Code + _curPos, (__int64)_curAdr, &_disInfo, 0);
if (_disInfo.Branch)
{
_bjl = new TBJL;
_bjl->branch = true;
_bjl->loc = false;
if (IsFlagSet(cfSkip, _curPos))
_bjl->type = BJL_SKIP_BRANCH;
else
_bjl->type = BJL_BRANCH;
_bjl->address = _disInfo.Immediate;
_bjl->idx = 0;
bjllist->Add((void*)_bjl);
_bjlInfo = new TBJLInfo;
_bjlInfo->state = 'B';
_bjlInfo->bcnt = 0;
_bjlInfo->address = _disInfo.Immediate;
_b = *(Code + _curPos);
if (_b == 0xF) _b = *(Code + _curPos + 1);
_bjlInfo->dExpr = GetDirectCondition((_b & 0xF) + 'A');
_bjlInfo->iExpr = GetInvertCondition((_b & 0xF) + 'A');
BJLseq->Add((void*)_bjlInfo);
}
_curPos += _instrLen; _curAdr += _instrLen;
}
for (i = 0, BJLmaxbcnt = 0; i < bjllist->Count; i++)
{
_bjl1 = (TBJL*)bjllist->Items[i];
if (_bjl1->type == BJL_BRANCH || _bjl1->type == BJL_SKIP_BRANCH)
{
for (j = 0; j < bjllist->Count; j++)
{
_bjl2 = (TBJL*)bjllist->Items[j];
if (_bjl2->type == BJL_LOC && _bjl1->address == _bjl2->address)
{
_bjlInfo = (TBJLInfo*)BJLseq->Items[j];
_bjlInfo->bcnt++;
if (_bjlInfo->bcnt > BJLmaxbcnt)
BJLmaxbcnt = _bjlInfo->bcnt;
}
}
}
}
while (1)
{
found = false;
for (i = 0; i < bjllist->Count; i++)
{
_bjl1 = (TBJL*)bjllist->Items[i];
if (_bjl1->type == BJL_SKIP_BRANCH)
{
_adr = _bjl1->address;
bjllist->Delete(i);
delete _bjl1;
_bjlInfo1 = (TBJLInfo*)BJLseq->Items[i];
BJLseq->Delete(i);
delete _bjlInfo1;
for (j = 0; j < bjllist->Count; j++)
{
_bjl2 = (TBJL*)bjllist->Items[j];
if (_bjl2->type == BJL_LOC && _adr == _bjl2->address)
{
_bjlInfo2 = (TBJLInfo*)BJLseq->Items[j];
_bjlInfo2->bcnt--;
if (!_bjlInfo2->bcnt)
{
bjllist->Delete(j);
delete _bjl2;
BJLseq->Delete(j);
delete _bjlInfo2;
}
found = true;
break;
}
}
if (found) break;
}
}
if (!found) break;
}