feat: full no_std support

Signed-off-by: Henry Gressmann <mail@henrygressmann.de>

1 files changed, 41 insertions, 0 deletions

diff --git a/examples/rust/src/tinywasm.rs b/examples/rust/src/tinywasm.rs
new file mode 100644
index 0000000..4edde66
--- /dev/null
+++ b/examples/rust/src/tinywasm.rs
@@ -0,0 +1,41 @@
+#![no_std]
+#![no_main]
+
+use embedded_alloc::Heap;
+// use tinywasm::{Extern, FuncContext};
+
+#[cfg(not(test))]
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    core::arch::wasm32::unreachable()
+}
+
+#[global_allocator]
+static HEAP: Heap = Heap::empty();
+
+#[no_mangle]
+pub unsafe extern "C" fn _start() {
+    // Initialize the allocator BEFORE you use it
+    {
+        use core::mem::MaybeUninit;
+        const HEAP_SIZE: usize = 1024;
+        static mut HEAP_MEM: [MaybeUninit<u8>; HEAP_SIZE] = [MaybeUninit::uninit(); HEAP_SIZE];
+        unsafe { HEAP.init(HEAP_MEM.as_ptr() as usize, HEAP_SIZE) }
+    }
+
+    // now the allocator is ready types like Box, Vec can be used.
+    let _ = run();
+}
+
+fn run() -> tinywasm::Result<()> {
+    // let module = tinywasm::Module::parse_bytes(include_bytes!("../out/hello.wasm"))?;
+    // let mut store = tinywasm::Store::default();
+
+    // let mut imports = tinywasm::Imports::new();
+    // imports.define("env", "printi32", Extern::typed_func(|_: FuncContext<'_>, _: i32| Ok(())))?;
+
+    // let instance = module.instantiate(&mut store, Some(imports))?;
+    // let add_and_print = instance.typed_func::<(i32, i32), ()>(&mut store, "add_and_print")?;
+    // add_and_print.call(&mut store, (1, 2))?;
+    Ok(())
+}