wasmer/lib/emscripten/src/varargs.rs

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use std::mem;
use wasmer_runtime_core::{types::WasmExternType, vm::Ctx};
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#[repr(transparent)]
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#[derive(Copy, Clone)]
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pub struct VarArgs {
pub pointer: u32, // assuming 32bit wasm
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}
impl VarArgs {
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pub fn get<T: Sized>(&mut self, ctx: &mut Ctx) -> T {
let ptr = emscripten_memory_pointer!(ctx.memory(0), self.pointer);
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self.pointer += mem::size_of::<T>() as u32;
unsafe { (ptr as *const T).read() }
}
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}
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unsafe impl WasmExternType for VarArgs {
type Native = i32;
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fn to_native(self) -> Self::Native {
self.pointer as _
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}
fn from_native(n: Self::Native) -> Self {
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Self { pointer: n as u32 }
}
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}