paxCompiler Tutorial: Boost Performance with Dynamic Compilation
Software applications often need to execute user-defined logic, math formulas, or scripts at runtime. Hardcoding these rules requires constant recompilation and redeployment. Interpreted scripting languages solve this but introduce a massive performance penalty.
paxCompiler bridges this gap. It is an embeddable compiler for Delphi, C++, and Free Pascal that compiles Pascal, Basic, and JavaScript source code directly into machine code at runtime.
This tutorial demonstrates how to integrate paxCompiler into your application to achieve native execution speeds for dynamic scripts. Why Choose paxCompiler?
True Machine Code: Generates native x86, x64, and ARM machine code in memory.
No External Dependencies: Deploys as a clean, self-contained component inside your executable.
Bi-directional Binding: Implements seamless calling between host application functions and script code.
Multi-Language Support: Supports Pascal, Basic, and JavaScript syntaxes out of the box. Step 1: Setting Up the Component
To get started, drop a TpaxCompiler component onto your Delphi form or instantiate it dynamically in code. You will also need a TpaxProgram component, which acts as the container for your compiled script.
var Compiler: TpaxCompiler; Prog: TpaxProgram; begin Compiler := TpaxCompiler.Create(nil); Prog := TpaxProgram.Create(nil); try // Configuration and compilation logic goes here finally Prog.Free; Compiler.Free; end; end; Use code with caution. Step 2: Registering Host Host Functions
For scripts to be useful, they usually need to interact with your main application. You must register host variables, types, or functions with the compiler before running the script.
Here is how to register a native Delphi function so the script can call it:
// The host function we want to expose to the script function Multiplier(Value: Integer): Integer; begin Result := Value42; end; procedure RegisterHostFunctions(Compiler: TpaxCompiler); begin // Register the function signature with the compiler Compiler.RegisterFunction(‘function Multiplier(Value: Integer): Integer;’); // Bind the script function name to the actual memory address of the Delphi function Compiler.BindAddress(‘Multiplier’, @Multiplier); end; Use code with caution. Step 3: Compiling and Running a Script
Once your host environment is mapped, you can feed a string of source code into the compiler. paxCompiler checks the syntax, translates it to native machine code, and loads it into the TpaxProgram instance for execution.
procedure ExecuteDynamicScript(Compiler: TpaxCompiler; Prog: TpaxProgram); var ScriptCode: string; begin // A simple Pascal script calling our host function ScriptCode := ‘var’ + #13#10 + ‘ Input, Output: Integer;’ + #13#10 + ‘begin’ + #13#10 + ‘ Input := 10;’ + #13#10 + ‘ Output := Multiplier(Input);’ + #13#10 + ‘end.’; // Add the source code to the compiler module Compiler.AddModule(‘MyScript’, PascalLanguage); Compiler.AddCode(‘MyScript’, ScriptCode); // Compile the script into native code if Compiler.Compile(Prog) then begin // Run the compiled code instantly at native speed Prog.Run; end else begin // Output compilation errors ShowMessage(Compiler.ErrorMessage); end; end; Use code with caution. Performance Optimization Tips
While paxCompiler runs scripts at native speeds, you can optimize your implementation further with these best practices:
Compile Once, Execute Many: Compilation takes time. Compile your dynamic scripts during application startup or configuration changes, cache the TpaxProgram binary in memory, and simply call Prog.Run whenever needed.
Minimize Global Lookups: Accessing host variables from within a script introduces minor overhead. Pass required variables as parameters to script functions instead.
Thread Safety: The TpaxCompiler instance is not thread-safe during compilation. However, once a TpaxProgram is compiled, it can be executed safely across multiple threads simultaneously. Conclusion
paxCompiler eliminates the performance trade-off of runtime scripting. By compiling user scripts directly into machine code, your application retains the flexibility of a scripting engine while maintaining the raw performance of a compiled native application.
If you want to tailor this implementation to your project, tell me:
What host programming language are you using? (Delphi, C++ Builder, Free Pascal)
Which scripting language syntax do your users prefer? (Pascal, JavaScript, Basic) Are you targeting Windows, Linux, or Mobile?
I can provide a code snippet designed specifically for your stack.
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