symbolhandlerlite.pas

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unit symbolhandlerlite;

interface

uses classes,windows,imagehlp,sysutils,syncobjs,tlhelp32;

Type TMemoryRegion = record
  BaseAddress: Dword;
  MemorySize: Dword;
  IsChild: boolean;
  startaddress: pointer;
  end;
type TMemoryregions = array of tmemoryregion;

type TUserdefinedsymbol=record
  symbolname: string;
  address: dword;
end;

type TModuleInfo=record
  modulename: string;
  baseaddress: dword;
  basesize: dword;
end;

type TUserdefinedSymbolCallback=procedure;

type TSymHandler=class
  private
    lastmodulelistupdate: integer;
    modulelistpos: integer;
    modulelist: array of TModuleInfo;

    symbolloadervalid: TMultiReadExclusiveWriteSynchronizer;
    modulelistMREW: TMultiReadExclusiveWriteSynchronizer;

    userdefinedsymbolspos: integer;
    userdefinedsymbols: array of TUserdefinedsymbol;
    userdefinedsymbolsMREW: TMultireadExclusiveWriteSynchronizer;

    fshowmodules: boolean;   //--determines what is returned by getnamefromaddress
    fshowsymbols: boolean;   ///

    UserdefinedSymbolCallback: TUserdefinedSymbolCallback;

    function getusedprocesshandle :thandle;
    function getusedprocessid:dword;
    function getisloaded:boolean;

    procedure setshowmodules(x: boolean);
    procedure setshowsymbols(x: boolean);
  public


    locked: boolean;

    property showmodules: boolean read fshowmodules write setshowmodules;
    property showsymbols: boolean read fshowsymbols write setshowsymbols;

    property usedprocesshandle: thandle read getusedprocesshandle;
    property usedprocessid: dword read getusedprocessid;
    property isloaded: boolean read getisloaded;
    procedure waitforsymbolsloaded;
    procedure reinitialize;
    procedure loadmodulelist;
    procedure fillMemoryRegionsWithModuleData(var mr: TMemoryregions; startaddress: dword; size: dword);
    function getmodulebyaddress(address: dword; var mi: TModuleInfo):BOOLEAN;
    function getmodulebyname(modulename: string; var mi: TModuleInfo):BOOLEAN;
    function getNameFromAddress(address:dword):string;
    function getAddressFromName(name: string):dword; overload;
    function getAddressFromName(name: string; waitforsymbols: boolean):dword; overload;

    //userdefined symbols
    function DeleteUserdefinedSymbol(symbolname:string):boolean;
    function GetUserdefinedSymbolByName(symbolname:string):dword;
    function GetUserdefinedSymbolByAddress(address:dword):string;
    procedure AddUserdefinedSymbol(address: dword; symbolname: string);
    procedure EnumerateUserdefinedSymbols(list:tstrings);

    procedure RegisterUserdefinedSymbolCallback(callback: TUserdefinedSymbolCallback);
    constructor create;
end;

var symhandler: TSymhandler;
    processhandle: thandle;
    processid: dword;

implementation

type TSymbolloaderthread=class(tthread)
  public
    isloading: boolean;
    symbolsloaded: boolean;
    thisprocesshandle: thandle;
    thisprocessid: dword;
    procedure execute; override;
    constructor create(CreateSuspended: boolean);
end;

var symbolloaderthread: TSymbolloaderthread;
    symbolprocesshandle: thandle;

procedure TSymbolloaderthread.execute;
begin
  try
    SymbolsLoaded:=false;
    if symbolprocesshandle<>0 then Symcleanup(symbolprocesshandle); //cleanup first

    SymbolsLoaded:=SymInitialize(thisprocesshandle,nil,true);
    symsetoptions(symgetoptions or SYMOPT_CASE_INSENSITIVE);

    symbolprocesshandle:=processhandle;

  finally
    isloading:=false;
  end;
end;

constructor TSymbolloaderthread.create(CreateSuspended: boolean);
begin
  thisprocesshandle:=processhandle;
  thisprocessid:=processid;
  isloading:=true;
  SymbolsLoaded:=false;

  inherited create(suspended);
end;

function TSymhandler.getisloaded:boolean;
begin
  symbolloadervalid.beginread;
  if symbolloaderthread<>nil then
    result:=not symbolloaderthread.isloading
  else
    result:=false;

  symbolloadervalid.endread;
end;

procedure TSymhandler.RegisterUserdefinedSymbolCallback(callback: TUserdefinedSymbolCallback);
begin
  UserdefinedSymbolCallback:=callback;
end;

procedure TSymhandler.setshowmodules(x: boolean);
begin
  if locked then raise exception.Create('You can''t change this setting at the moment');
  fshowmodules:=x;
end;

procedure TSymhandler.setshowsymbols(x: boolean);
begin
  if locked then raise exception.Create('You can''t change this setting at the moment');
  fshowsymbols:=x;
end;


function TSymhandler.getusedprocessid:dword;
begin
  symbolloadervalid.beginread;
  if symbolloaderthread<>nil then
    result:=symbolloaderthread.thisprocessid
  else
    result:=0;

  symbolloadervalid.endread;
end;

function TSymhandler.getusedprocesshandle:thandle;
begin
  symbolloadervalid.beginread;
  if symbolloaderthread<>nil then
    result:=symbolloaderthread.thisprocesshandle
  else
    result:=0;

  symbolloadervalid.endread;
end;

procedure TSymhandler.reinitialize;
var previousprocesshandle: thandle;
begin
  loadmodulelist;

  symbolloadervalid.BeginWrite;
  if symbolloaderthread<>nil then
  begin
    symbolloaderthread.WaitFor; //wait till it's done
    symbolloaderthread.Free;
  end;

  symbolloaderthread:=tsymbolloaderthread.Create(false);

  symbolloadervalid.EndWrite;
end;

procedure TSymhandler.Waitforsymbolsloaded;
begin
  symbolloadervalid.beginread;
  if symbolloaderthread<>nil then
    symbolloaderthread.WaitFor;
  symbolloadervalid.endread;
end;

function TSymhandler.DeleteUserdefinedSymbol(symbolname:string):boolean;
var i,j: integer;
begin
  result:=false;
  userdefinedsymbolsMREW.beginwrite;
  for i:=0 to userdefinedsymbolspos-1 do
    if uppercase(userdefinedsymbols[i].symbolname)=uppercase(symbolname) then
    begin
      //found it, now move up all the others and decrease the list
      for j:=i to userdefinedsymbolspos-2 do
        userdefinedsymbols[j]:=userdefinedsymbols[j+1];

      dec(userdefinedsymbolspos);
      result:=true;
      break;
    end;
  userdefinedsymbolsMREW.endwrite;

  if assigned(UserdefinedSymbolCallback) then
    UserdefinedSymbolCallback();
end;

function TSymhandler.GetUserdefinedSymbolByName(symbolname:string):dword;
var i:integer;
begin
  result:=0;
  userdefinedsymbolsMREW.beginread;
  for i:=0 to userdefinedsymbolspos-1 do
    if uppercase(userdefinedsymbols[i].symbolname)=uppercase(symbolname) then
    begin
      result:=userdefinedsymbols[i].address;
      break;
    end;
  userdefinedsymbolsMREW.endread;
end;

function TSymhandler.GetUserdefinedSymbolByAddress(address:dword):string;
var i:integer;
begin
  result:='';
  userdefinedsymbolsMREW.beginread;
  for i:=0 to userdefinedsymbolspos-1 do
    if userdefinedsymbols[i].address=address then
    begin
      result:=userdefinedsymbols[i].symbolname;
      break;
    end;
  userdefinedsymbolsMREW.endread;
end;

procedure TSymhandler.AddUserdefinedSymbol(address: dword; symbolname: string);
begin
  if address=0 then raise exception.Create('You can''t add a symbol with address 0');
  if getuserdefinedsymbolbyname(symbolname)>0 then raise exception.Create(symbolname+' already exists');

  userdefinedsymbolsMREW.beginwrite;
  try
    if userdefinedsymbolspos+1>=length(userdefinedsymbols) then
      setlength(userdefinedsymbols,length(userdefinedsymbols)*2);

    userdefinedsymbols[userdefinedsymbolspos].address:=address;
    userdefinedsymbols[userdefinedsymbolspos].symbolname:=symbolname;
    inc(userdefinedsymbolspos);

    if assigned(UserdefinedSymbolCallback) then
      UserdefinedSymbolCallback();
  finally
    userdefinedsymbolsMREW.endwrite;
  end;
end;

procedure TSymhandler.EnumerateUserdefinedSymbols(list:tstrings);
var i: integer;
begin
  list.Clear;
  userdefinedsymbolsMREW.BeginRead;
  for i:=0 to userdefinedsymbolspos-1 do
    list.Addobject(userdefinedsymbols[i].symbolname,pointer(userdefinedsymbols[i].address));
  userdefinedsymbolsMREW.EndRead;
end;

procedure TSymhandler.fillMemoryRegionsWithModuleData(var mr: TMemoryregions; startaddress: dword; size: dword);
var currentaddress: dword;
    mi: tmoduleinfo;
    sizeleft: dword;
    i: integer;
    closest: integer;
    ok: boolean;
begin
  modulelistMREW.beginread;
  try
    if modulelistpos=0 then exit;

    currentaddress:=startaddress;
    sizeleft:=size;