wasmer/examples/platform_ios_headless.rs

//! Defining an engine in Wasmer is one of the fundamental steps.
//!
//! This example builds on that of 'engine_headless.rs' but instead of
//! serializing a module and then deserializing it again for your host machines target,
//! We instead create an engine for our target architecture (In this case an ARM64 iOS device),
//! serialize a simple module to a .dylib file that can be copied to an iOS project and
//! deserialized/ran using the 'Headless C-API'.
//!
//! ```shell
//! cargo run --example platform-headless-ios --release --features "cranelift"
//! ```
//!
//! Ready?

use std::path::Path;
use std::str::FromStr;
use wasmer::{wat2wasm, Module, RuntimeError, Store};
use wasmer_compiler::{CpuFeature, Target, Triple};
use wasmer_compiler_cranelift::Cranelift;
/*
use wasmer_engine_dylib::Dylib;
*/

fn main() -> Result<(), Box<dyn std::error::Error>> {
    /*
        // Let's declare the Wasm module with the text representation.
        let wasm_bytes = wat2wasm(
            r#"
    (module
    (type $sum_t (func (param i32 i32) (result i32)))
    (func $sum_f (type $sum_t) (param $x i32) (param $y i32) (result i32)
    local.get $x
    local.get $y
    i32.add)
    (export "sum" (func $sum_f)))
    "#
            .as_bytes(),
        )?;

        // Create a compiler for iOS
        let compiler_config = Cranelift::default();
        // Change it to `x86_64-apple-ios` if you want to target the iOS simulator
        let triple = Triple::from_str("aarch64-apple-ios")
            .map_err(|error| RuntimeError::new(error.to_string()))?;

        // Let's build the target.
        let mut cpu_feature = CpuFeature::set();
        cpu_feature.insert(CpuFeature::from_str("sse2")?);
        let target = Target::new(triple, cpu_feature);
        println!("Chosen target: {:?}", target);

        println!("Creating Dylib engine...");
        let engine = Dylib::new(compiler_config).target(target).engine();

        // Create a store, that holds the engine.
        let mut store = Store::new_with_engine(&engine);

        println!("Compiling module...");
        // Let's compile the Wasm module.
        let module = Module::new(&store, wasm_bytes)?;
        // Here we go. Let's serialize the compiled Wasm module in a
        // file.
        println!("Serializing module...");
        let dylib_file = Path::new("./sum.dylib");
        module.serialize_to_file(dylib_file)?;
    */

    Ok(())
}

#[test]
#[cfg(target_os = "macos")]
fn test_engine_headless_ios() -> Result<(), Box<dyn std::error::Error>> {
    main()
}