1a0ed6e388
This provides assert_le, assert_lt, and so on, which can print the values of the operands.
82 lines
2.3 KiB
Rust
82 lines
2.3 KiB
Rust
//! Translation of multi example
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extern crate alloc;
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use alloc::rc::Rc;
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use anyhow::{ensure, format_err, Context as _, Result};
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use core::cell::Ref;
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use std::fs::read;
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use wasmtime_api::*;
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struct Callback;
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impl Callable for Callback {
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fn call(&self, args: &[Val], results: &mut [Val]) -> Result<(), HostRef<Trap>> {
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println!("Calling back...");
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println!("> {} {}", args[0].i32(), args[1].i64());
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results[0] = Val::I64(args[1].i64() + 1);
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results[1] = Val::I32(args[0].i32() + 1);
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Ok(())
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}
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}
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fn main() -> Result<()> {
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// Initialize.
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println!("Initializing...");
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let engine = HostRef::new(Engine::default());
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let store = HostRef::new(Store::new(&engine));
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// Load binary.
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println!("Loading binary...");
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let binary = read("examples/multi.wasm")?;
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// Compile.
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println!("Compiling module...");
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let module = HostRef::new(Module::new(&store, &binary).context("Error compiling module!")?);
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// Create external print functions.
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println!("Creating callback...");
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let callback_type = FuncType::new(
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Box::new([ValType::I32, ValType::I64]),
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Box::new([ValType::I64, ValType::I32]),
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);
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let callback_func = HostRef::new(Func::new(&store, callback_type, Rc::new(Callback)));
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// Instantiate.
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println!("Instantiating module...");
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let imports = vec![callback_func.into()];
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let instance = HostRef::new(
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Instance::new(&store, &module, imports.as_slice())
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.context("Error instantiating module!")?,
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);
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// Extract export.
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println!("Extracting export...");
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let exports = Ref::map(instance.borrow(), |instance| instance.exports());
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ensure!(!exports.is_empty(), "Error accessing exports!");
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let run_func = exports[0].func().context("Error accessing exports!")?;
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// Call.
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println!("Calling export...");
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let args = vec![Val::I32(1), Val::I64(3)];
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let results = run_func
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.borrow()
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.call(&args)
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.map_err(|e| format_err!("> Error calling function: {:?}", e))?;
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println!("Printing result...");
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println!("> {} {}", results[0].i64(), results[1].i32());
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debug_assert_eq!(results[0].i64(), 4);
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debug_assert_eq!(results[1].i32(), 2);
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// Shut down.
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println!("Shutting down...");
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drop(store);
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// All done.
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println!("Done.");
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Ok(())
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}
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