Borland Delphi 7, released in 2002, remains a popular legacy rapid application development (RAD) tool. It compiles Object Pascal source code into native x86 executables (EXEs) or dynamic link libraries (DLLs). Unlike .NET or Java bytecode, Delphi produces raw machine code, making decompilation significantly more complex. However, due to Delphi’s predictable metadata structures (forms, RTTI, string tables, and method prologues), targeted decompilation tools can recover a high-level approximation of the original source code.
However, decompiling a native Windows application built with Delphi 7 is significantly different from decompiling managed code like C# or Java. 🧩 The Reality of Decompiling Delphi 7
Decompiling a Borland Delphi 7 executable typically focuses on recovering user interface (UI) layouts and event handler addresses rather than a perfect copy of the original source code. Because Delphi compiles directly to native machine code, most tools will provide assembly code for the logic while successfully rebuilding the .dfm form files. Top Decompiler Tools for Delphi 7 borland delphi 7 decompiler
As the sun began to rise, Elias compiled a fix. The "ghost" of the Borland Delphi 7 project had been brought back to life, proving that even when the source code is lost, the logic is never truly gone if you have the right tools.
As they began to analyze the decompiled code, they realized that it was a treasure trove of information. The code was complex, but it was readable, and they could see the structure of the ERP system laid out before them. Ghidra with Delphi Class Recovery Plugin – can
| Aspect | Disassembly | Decompilation | |--------|-------------|---------------| | Output | Assembly (mov, call, jmp) | High-level code (Pascal-like) | | Preserves | All instructions | Logic, event handlers, forms | | Loses | High-level structures | Original variable names, comments, some loops/if structures | | Delphi-specific | Can be annotated with Delphi RTTI | Recreates classes, properties, methods |
| Artifact | Recoverable? | Quality |
|----------|--------------|---------|
| Form layout (DFM) | ✅ Yes | Perfect (text .dfm) |
| Component properties | ✅ Yes | Perfect |
| Event handler names (e.g., Button1Click) | ✅ Yes | Exact |
| Global variables & constants | ✅ Yes (from RTTI) | Good |
| Method implementation (body) | ⚠️ Partial | Assembly→Pseudo-Pascal with goto |
| Local variable names | ❌ No | Replaced with local_1, local_2 |
| Inline assembly | ✅ Yes (as asm...end) | Exact |
| Optimized loops | ❌ Poor | Broken into jumps |
| try/except/finally | ⚠️ Partial | Often malformed |
| case statement | ⚠️ Partial | Recovered as if-else chain |
| String/AnsiString operations | ✅ Yes | Recognizable (LStrXXX calls mapped) | As they began to analyze the decompiled code,
| Artifact | Recovered? | Fidelity |
|----------|-----------|----------|
| Form layout (.dfm) | Yes | 100% (exact) |
| Published event handlers (names) | Yes | 100% |
| Unit/Form class names | Yes | Original |
| Component properties (Caption, Color, etc.) | Yes | Exact |
| Global variables | Partial | Types recoverable, names lost |
| Local variable names | No | Replaced with var_1, var_2 |
| Comment lines | No | Permanently lost |
| Original if/then/else vs. case statement | Partial | Logic correct, but structure may be flattened |
| Loop constructs (for/while/repeat) | Partial | Heuristics applied |
| Inline assembly blocks | Yes | Recovered as asm…end |