Footprint calculations done by building an empty sketch for an Arduino then comparing to a (no io) VM sketch.

arduino-cli compile -b STMicroelectronics:stm32:GenL0 -e

README.md

@@ -2,6 +2,8 @@
 
 uvm32 is a minimalist, dependency-free virtual machine sandbox designed for microcontrollers and other resource-constrained devices. Single C file, no dynamic memory allocations, asynchronous design, pure C99.
 
+On an [STM32L0](https://www.st.com/en/microcontrollers-microprocessors/stm32l0-series.html) (ARM Cortex-M0+) the required footprint is under 4KB flash/1KB RAM.
+
 ## What is it for?
 
 * As a no-frills alternative to embedded script engines ([Lua](https://www.lua.org/), [Duktape](https://duktape.org/), [MicroPython](https://micropython.org/), etc)

host-arduino/host-arduino.ino

@@ -70,6 +70,4 @@ void loop(void) {
         uvm32_load(&vmst, ___precompiled_mandel_bin, ___precompiled_mandel_bin_len);
         isrunning = true;
     }
-
-    return;
 }