> For the complete documentation index, see [llms.txt](https://guide.cronuszen.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guide.cronuszen.com/zen-studio/working-panels/compiler.md).

# Compiler

The Compiler is an integrated development environment (IDE) for creating, editing, and compiling GPC scripts.

Features include:

• Syntax highlighting\
• Find / Replace\
• Real-time error reporting\
• Bytecode size and memory usage analysis\
• Debug output window

### 16-Bit vs 32-Bit Scripts

***

Legacy 16-bit scripts must be compiled using the **Legacy 16-Bit Compiler**.

Enable this option in:

**Device Panel → Use Legacy 16-Bit Compiler**

Use this only for older scripts that require compatibility.

## Compiler Interface

***

### Tab Bar

Displays all open GPC scripts.

• Drag and drop to reorder tabs\
• An asterisk (\*) indicates unsaved changes

### Editor Window

Used to edit GPC source code.

Includes:

• Real-time syntax highlighting\
• Text formatting\
• Search functionality

Syntax highlighting improves readability and reduces coding errors.

### Compiler Output

Displays compilation results for the active script.

Output includes:

• Errors\
• Warnings\
• Bytecode size\
• Stack memory usage\
• Percentage of memory used

Cronus Zen provides **8 × 32KB memory slots**.

#### Important

Warnings should be treated as errors.

Even if compilation succeeds, warnings may indicate:

• Deprecated functions\
• Out-of-range values\
• Potential instability

Unresolved warnings can cause runtime issues or device error codes.

## Compiler Menu

***

### Font Size

Adjust editor font size via:

**Compiler → Font Size**

Default: 10

### Compile (F7)

Compiles the active script without running it.

Used to verify:

• Errors\
• Warnings\
• Memory usage

### Build and Run (F5)

Compiles the active script and loads it directly into device RAM.

The script runs immediately without programming a memory slot.

Commonly used for live testing with the **Device Monitor**.

### Publish Script

Allows submission of a GPC script to the public GPC Library.

Requirements:

• Registered device\
• Internet connection

Access via:

**Compiler → Publish Script**

This opens the publishing portal in your default web browser.


---

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