9364eb1d98
* Compute instance exports on demand. Instead having instances eagerly compute a Vec of Externs, and bumping the refcount for each Extern, compute Externs on demand. This also enables `Instance::get_export` to avoid doing a linear search. This also means that the closure returned by `get0` and friends now holds an `InstanceHandle` to dynamically hold the instance live rather than being scoped to a lifetime. * Compute module imports and exports on demand too. And compute Extern::ty on demand too. * Add a utility function for computing an ExternType. * Add a utility function for looking up a function's signature. * Add a utility function for computing the ValType of a Global. * Rename wasmtime_environ::Export to EntityIndex. This helps differentiate it from other Export types in the tree, and describes what it is. * Fix a typo in a comment. * Simplify module imports and exports. * Make `Instance::exports` return the export names. This significantly simplifies the public API, as it's relatively common to need the names, and this avoids the need to do a zip with `Module::exports`. This also changes `ImportType` and `ExportType` to have public members instead of private members and accessors, as I find that simplifies the usage particularly in cases where there are temporary instances. * Remove `Instance::module`. This doesn't quite remove `Instance`'s `module` member, it gets a step closer. * Use a InstanceHandle utility function. * Don't consume self in the `Func::get*` methods. Instead, just create a closure containing the instance handle and the export for them to call. * Use `ExactSizeIterator` to avoid needing separate `num_*` methods. * Rename `Extern::func()` etc. to `into_func()` etc. * Revise examples to avoid using `nth`. * Add convenience methods to instance for getting specific extern types. * Use the convenience functions in more tests and examples. * Avoid cloning strings for `ImportType` and `ExportType`. * Remove more obviated clone() calls. * Simplify `Func`'s closure state. * Make wasmtime::Export's fields private. This makes them more consistent with ExportType. * Fix compilation error. * Make a lifetime parameter explicit, and use better lifetime names. Instead of 'me, use 'instance and 'module to make it clear what the lifetime is. * More lifetime cleanups.
31 lines
1.1 KiB
Rust
31 lines
1.1 KiB
Rust
//! Example of enabling debuginfo for wasm code which allows interactive
|
|
//! debugging of the wasm code. When using recent versions of LLDB
|
|
//! you can debug this executable and set breakpoints in wasm code and look at
|
|
//! the rust source code as input.
|
|
|
|
// To execute this example you'll need to run two commands:
|
|
//
|
|
// cargo build -p example-fib-wasm --target wasm32-unknown-unknown
|
|
// cargo run --example fib-debug
|
|
|
|
use anyhow::Result;
|
|
use wasmtime::*;
|
|
|
|
fn main() -> Result<()> {
|
|
// Load our previously compiled wasm file (built previously with Cargo) and
|
|
// also ensure that we generate debuginfo so this executable can be
|
|
// debugged in GDB.
|
|
let engine = Engine::new(Config::new().debug_info(true));
|
|
let store = Store::new(&engine);
|
|
let module = Module::from_file(&store, "target/wasm32-unknown-unknown/debug/fib.wasm")?;
|
|
let instance = Instance::new(&module, &[])?;
|
|
|
|
// Invoke `fib` export
|
|
let fib = instance
|
|
.get_func("fib")
|
|
.ok_or(anyhow::format_err!("failed to find `fib` function export"))?
|
|
.get1::<i32, i32>()?;
|
|
println!("fib(6) = {}", fib(6)?);
|
|
Ok(())
|
|
}
|