Struct watt_non_static_runtime::WasmMacro

pub struct WasmMacro<'bytecode> { /* fields omitted */ }

An instantiation of a WebAssembly module used to invoke procedural macro methods on the wasm module.

Examples

static MACRO: WasmMacro = WasmMacro::new(WASM);
static WASM: &[u8] = include_bytes!("my_macros.wasm");

Implementations

impl<'bytecode> WasmMacro<'bytecode>

pub const fn new(wasm: &'bytecode [u8]) -> Self

Creates a new WasmMacro from the statically included blob of wasm bytes.

Examples

static MACRO: WasmMacro = WasmMacro::new(WASM);
static WASM: &[u8] = include_bytes!("my_macros.wasm");

pub fn proc_macro(&self, fun: &str, input: TokenStream) -> TokenStream

A #[proc_macro] implemented in wasm!

Canonical macro implementation:

use proc_macro2::TokenStream;

#[no_mangle]
pub extern "C" fn the_macro(input: TokenStream) -> TokenStream {
    ...
}

Canonical entry point:

use proc_macro::TokenStream;
use watt::WasmMacro;

static MACRO: WasmMacro = WasmMacro::new(WASM);
static WASM: &[u8] = include_bytes!("my_macros.wasm");

#[proc_macro]
pub fn the_macro(input: TokenStream) -> TokenStream {
    MACRO.proc_macro("the_macro", input)
}

pub fn proc_macro_derive(&self, fun: &str, input: TokenStream) -> TokenStream

A #[proc_macro_derive] implemented in wasm!

Canonical macro implementation:

use proc_macro2::TokenStream;

#[no_mangle]
pub extern "C" fn the_macro(input: TokenStream) -> TokenStream {
    ...
}

Canonical entry point:

use proc_macro::TokenStream;
use watt::WasmMacro;

static MACRO: WasmMacro = WasmMacro::new(WASM);
static WASM: &[u8] = include_bytes!("my_macros.wasm");

#[proc_macro_derive(MyDerive)]
pub fn the_macro(input: TokenStream) -> TokenStream {
    MACRO.proc_macro_derive("the_macro", input)
}

pub fn proc_macro_attribute(
    &self,
    fun: &str,
    args: TokenStream,
    input: TokenStream
) -> TokenStream

A #[proc_macro_attribute] implemented in wasm!

Canonical macro implementation:

use proc_macro2::TokenStream;

#[no_mangle]
pub extern "C" fn the_macro(args: TokenStream, input: TokenStream) -> TokenStream {
    ...
}

Canonical entry point:

use proc_macro::TokenStream;
use watt::WasmMacro;

static MACRO: WasmMacro = WasmMacro::new(WASM);
static WASM: &[u8] = include_bytes!("my_macros.wasm");

#[proc_macro_attribute]
pub fn the_macro(args: TokenStream, input: TokenStream) -> TokenStream {
    MACRO.proc_macro_attribute("the_macro", args, input)
}