1. summary DWScript FAQ
2. labels Featured

• *What Delphi versions are supported?* Delphi 2009 is the current minimum version. Development happens on Delphi XE however, so SVN version may temporarily become incompatible with previous versions.

FreePascal is currently not directly supported, though as FreePascal introduces support for recent Delphi language syntax, support could become possible. Check the [http://wiki.freepascal.org/DelphiWebScript FreePascal wiki] for more info on the state of FreePascal support.

• *Is DWS compiled or interpreted?* The scripts are compiled into an expression tree, which is executed via virtual method calls. It behaves somewhere in between a pure compiler and a pure interpreter. Some sub-expressions may actually be fully compiled (f.i. with the asm extension).

A JIT compiler is available for Win32 and will perform partial compilation, an LLVM based compiler is under development.

• *What optimizations are performed?* As of 2.2, only local optimizations are performed:
• Constant expressions are evaluated at compile-time, this includes expressions involving internal functions marked as "stateless" (maths functions, string conversions, etc.).
• Some "a := a op b" forms are optimized to compound operator variants " a op= b".
• "while" & "repeat" loops with constant conditions can be eliminated or have their condition eliminated.
• "if then else" with constant conditions can have their condition and unreachable branch eliminated.