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<h1><img src="decompiler.gif" width="32" height="32">Decompiler (version 0.0.2.12)</h1>
<h2>Introduction</h2>
<p>This page is about creating a Delphi decompiler on which I'm working now. The program is written
for Delphi 4 and will not work with a previous version of Delphi. Also it can only decompile
programs written with the same version of Delphi as the decompiler is compiled with. Here I will
put information about what I already have and how I want to extend my program, if you have any
comments or what so ever pease e-mail me. </p>
<h2>What it does</h2>
<p>The previous information about porting to Delphi 5 was incorrect, it still doesn't work, because
I first have to port the hard coded methods.</p>
<p>It gets all the classes, because these have a Self pointer in their VMT. And
they must all derive from TObject (more information about
<A HREF="findingClasses.shtml">finding classes</A>).</p>
<p>It gets also get all the TypeInfos, this is the type information for all your
types declarations, which are used with automatic initialization/finalization
or passed to TypeInfo. These TypeInfos can be found, because they have a pointer
to them self before them, and their kind must exist (the classes are not accepted,
because they are already found).</p>
<p>It gets a list of all procedures (functions, methods etc.) including nested
procedures, but not including procedures without a direct call (the one only
passed as parameters). These partially get by following the calls.</p>
<p>It gets a list of (ansi/wide)strings by searching for the strings hidden fields (reference count
(-1), length). (0.0.2.0)</p>
<p>It gets a list of resource strings (yes there is partial resource support). (0.0.2.0)</p>
<p>It gets a list of vars and consts (consts are vars which value never changes), by just breaking
the Data and BSS sections in parts using fixups and some auto generated vars. (0.0.2.0)</p>
<p>It puts all the information into a unit, which should be in the correct order. (0.0.2.0)</p>
<p>Complete support for published properties. (0.0.2.2)<p>
<p>Updated (26-7-1999): The list of procedure is extended with the imported procedures
and contains much more information about the procedures (size, imported, method
etc.). </p>
<p>Update (19-8-1999): There is now generated some real code which can recompiled,
however there is no support for resources, types, strings and much more, but there is
(limited) support for objects.</p>
<p>Update (18-9-1999): Many improvements, try decompiling a completely empty program, it
generates a completely empty program (how amazing). Almost every thing is supported, except
interfaces, packages, resources and thread vars. And not all the system procs are supported.</p>
<p>Vars are now kept in the original order to prevent problems with separating vars, which shouldn't be
separator (0.0.2.2).</p>
<p>Interface properties are supported, however type casting interface will cause unpredictable
behaviour (0.0.2.2).</p>
<p>There is now support for threadvars, only delphi removes them, because they are not directly
accessed (0.0.2.4).</p>
<p>There is now a screen indication that the program is running and makes is possible to cancel it (0.0.2.6).</p>
<p>DFMs are also dumped now. (0.0.2.8)</p>
<p>Some bug fixes concerning DFMs. (0.0.2.9)</p>
<p>Packages are now supported, there are still some problems with the code generated form packages,
but a least if published a lot of information about the package. (0.0.2.12)</p>
<h2>What will come</h2>
<p>I don't for see any problems with adding resources. Adding interface and package support
is much more complex, but with enough time it shouldn't be impossible.</p>
<p>I'm now focussing on the problem of adding package support.</P>
<h2>Compiling the decompiler</h2>
<p>The program will display additional message when DebugInformation is enabled. If you define the
conditional definition <I>DebugView</I>, the program won't generate output files, but will
display a form with information about the exe.</p>
<h2>Problems with decompiling</h2>
<p>First of all the program isn't very fast, there is now (version 0.0.2.6) some screen that indicates
that the program is running, there is also a button that cancels the decompilation, but that doesn't
respond very fast. Also there isn't an indicator for how far the decompilation process is.</p>
<p>Since it can decompile vcl40.bpl (It doesn't throw an exception), It is highly unlikly that
you get an exception due to some vcl code.
<p>Unless the code makes use of some exotic code (like obj files), there shouldn't be any problem
decompiling the program, recompiling it again has some more problems, because the program will
almost always include interface, resources, thread vars, constructors and/or destructors.<p>
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