2019-01-24 18:51:20 +00:00
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//! Wasmer-runtime is a library that makes embedding WebAssembly
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//! in your application easy, efficient, and safe.
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//!
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//! # How to use Wasmer-Runtime
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//!
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//! The easiest way is to use the [`instantiate`] function to create an [`Instance`].
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//! Then you can use [`call`] or [`func`] and then [`call`][func.call] to call an exported function safely.
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//!
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//! [`instantiate`]: fn.instantiate.html
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//! [`Instance`]: struct.Instance.html
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//! [`call`]: struct.Instance.html#method.call
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//! [`func`]: struct.Instance.html#method.func
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//! [func.call]: struct.Function.html#method.call
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//!
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//! ## Here's an example:
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//!
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//! Given this WebAssembly:
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//!
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//! ```wat
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//! (module
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//! (type $t0 (func (param i32) (result i32)))
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//! (func $add_one (export "add_one") (type $t0) (param $p0 i32) (result i32)
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//! get_local $p0
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//! i32.const 1
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//! i32.add))
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//! ```
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//!
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//! compiled into wasm bytecode, we can call the exported "add_one" function:
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//!
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//! ```
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//! static WASM: &'static [u8] = &[
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//! // The module above compiled to bytecode goes here.
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//! // ...
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//! # 0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00, 0x01, 0x06, 0x01, 0x60,
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//! # 0x01, 0x7f, 0x01, 0x7f, 0x03, 0x02, 0x01, 0x00, 0x07, 0x0b, 0x01, 0x07,
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//! # 0x61, 0x64, 0x64, 0x5f, 0x6f, 0x6e, 0x65, 0x00, 0x00, 0x0a, 0x09, 0x01,
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//! # 0x07, 0x00, 0x20, 0x00, 0x41, 0x01, 0x6a, 0x0b, 0x00, 0x1a, 0x04, 0x6e,
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//! # 0x61, 0x6d, 0x65, 0x01, 0x0a, 0x01, 0x00, 0x07, 0x61, 0x64, 0x64, 0x5f,
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//! # 0x6f, 0x6e, 0x65, 0x02, 0x07, 0x01, 0x00, 0x01, 0x00, 0x02, 0x70, 0x30,
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//! ];
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//!
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//! use wasmer_runtime::{
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//! instantiate,
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//! Value,
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//! imports,
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//! error,
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//! };
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//!
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//! fn main() -> error::Result<()> {
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//! // We're not importing anything, so make an empty import object.
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//! let import_object = imports! {};
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//!
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//! let mut instance = instantiate(WASM, import_object)?;
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//!
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//! let values = instance
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//! .func("add_one")?
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//! .call(&[Value::I32(42)])?;
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//!
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//! assert_eq!(values[0], Value::I32(43));
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//!
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//! Ok(())
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//! }
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//! ```
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//!
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//! # Additional Notes:
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//!
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//! The `wasmer-runtime` is build to support compiler multiple backends.
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//! Currently, we support the [Cranelift] compiler with the [`wasmer-clif-backend`] crate.
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//!
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//! You can specify the compiler you wish to use with the [`compile_with`] function.
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//!
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//! [Cranelift]: https://github.com/CraneStation/cranelift
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//! [`wasmer-clif-backend`]: https://crates.io/crates/wasmer-clif-backend
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//! [`compile_with`]: fn.compile_with.html
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2019-01-29 18:25:56 +00:00
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pub use wasmer_runtime_core::global::Global;
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2019-01-23 20:34:15 +00:00
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pub use wasmer_runtime_core::import::ImportObject;
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2019-01-23 23:30:35 +00:00
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pub use wasmer_runtime_core::instance::{Function, Instance};
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2019-01-25 23:33:15 +00:00
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pub use wasmer_runtime_core::memory::Memory;
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2019-01-22 19:02:06 +00:00
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pub use wasmer_runtime_core::module::Module;
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2019-01-29 18:25:56 +00:00
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pub use wasmer_runtime_core::table::Table;
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2019-01-23 20:34:15 +00:00
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pub use wasmer_runtime_core::types::Value;
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pub use wasmer_runtime_core::vm::Ctx;
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pub use wasmer_runtime_core::{compile_with, validate};
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2019-01-08 17:09:47 +00:00
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2019-01-23 20:34:15 +00:00
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pub use wasmer_runtime_core::error;
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2019-01-29 18:25:56 +00:00
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pub use wasmer_runtime_core::{func, imports};
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2019-01-23 20:34:15 +00:00
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2019-01-23 23:30:35 +00:00
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pub mod wasm {
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2019-01-29 18:25:56 +00:00
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pub use wasmer_runtime_core::global::Global;
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2019-01-23 23:30:35 +00:00
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pub use wasmer_runtime_core::instance::Function;
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2019-01-25 23:33:15 +00:00
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pub use wasmer_runtime_core::memory::Memory;
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2019-01-29 18:25:56 +00:00
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pub use wasmer_runtime_core::table::Table;
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pub use wasmer_runtime_core::types::{FuncSig, MemoryDesc, TableDesc, Type, Value};
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2019-01-23 20:34:15 +00:00
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}
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/// Compile WebAssembly binary code into a [`Module`].
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/// This function is useful if it is necessary to
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/// compile a module before it can be instantiated
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/// (otherwise, the [`instantiate`] function should be used).
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///
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/// [`Module`]: struct.Module.html
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/// [`instantiate`]: fn.instantiate.html
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2019-01-22 19:02:06 +00:00
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///
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2019-01-23 20:34:15 +00:00
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/// # Params:
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2019-01-22 19:02:06 +00:00
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/// * `wasm`: A `&[u8]` containing the
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/// binary code of the wasm module you want to compile.
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2019-01-23 20:34:15 +00:00
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/// # Errors:
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/// If the operation fails, the function returns `Err(error::CompileError::...)`.
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2019-01-22 19:02:06 +00:00
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#[cfg(feature = "wasmer-clif-backend")]
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2019-01-23 20:34:15 +00:00
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pub fn compile(wasm: &[u8]) -> error::CompileResult<Module> {
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2019-01-22 19:02:06 +00:00
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use wasmer_clif_backend::CraneliftCompiler;
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wasmer_runtime_core::compile_with(&wasm[..], &CraneliftCompiler::new())
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2019-01-21 22:43:04 +00:00
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}
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2019-01-23 20:34:15 +00:00
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/// Compile and instantiate WebAssembly code without
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/// creating a [`Module`].
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///
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/// [`Module`]: struct.Module.html
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2019-01-22 19:02:06 +00:00
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///
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2019-01-23 20:34:15 +00:00
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/// # Params:
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2019-01-22 19:02:06 +00:00
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/// * `wasm`: A `&[u8]` containing the
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/// binary code of the wasm module you want to compile.
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/// * `import_object`: An object containing the values to be imported
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/// into the newly-created Instance, such as functions or
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2019-01-23 20:34:15 +00:00
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/// Memory objects. There must be one matching property
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2019-01-22 19:02:06 +00:00
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/// for each declared import of the compiled module or else a
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2019-01-23 20:34:15 +00:00
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/// LinkError is thrown.
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/// # Errors:
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2019-01-22 19:02:06 +00:00
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/// If the operation fails, the function returns a
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/// `error::CompileError`, `error::LinkError`, or
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/// `error::RuntimeError` (all combined into an `error::Error`),
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/// depending on the cause of the failure.
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#[cfg(feature = "wasmer-clif-backend")]
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2019-01-23 20:34:15 +00:00
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pub fn instantiate(wasm: &[u8], import_object: ImportObject) -> error::Result<Instance> {
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2019-01-22 19:02:06 +00:00
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let module = compile(wasm)?;
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module.instantiate(import_object)
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2019-01-09 02:57:28 +00:00
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}
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2019-01-22 23:26:56 +00:00
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/// The current version of this crate
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pub const VERSION: &str = env!("CARGO_PKG_VERSION");
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