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# Wasmer Interface Types
Wasmer is a standalone JIT WebAssembly runtime, aiming to be fully
compatible with WASI, Emscripten, Rust and Go. [Learn
more](https://github.com/wasmerio/wasmer).
This crate is an implementation of [the living WebAssembly Interface
Types standard](https://github.com/WebAssembly/interface-types).
## Encoders and decoders
The `wasmer-interface-types` crate comes with an encoder and a decoder
for the WAT format, and the binary format, for the WebAssembly
Interface Types. An encoder writes an AST into another format, like
WAT or binary. A decoder reads an AST from another format, like WAT or
binary.
## Instructions
Very basically, WebAssembly Interface Types defines a [set of
instructions](https://github.com/WebAssembly/interface-types/blob/master/proposals/interface-types/working-notes/Instructions.md),
used by adapters to transform the data between WebAssembly core and
the outside world ([learn
mode](https://github.com/WebAssembly/interface-types/blob/master/proposals/interface-types/Explainer.md)).
Here is the instructions that are implemented by this crate:
| `arg.get` | ✅ | ✅ | ✅ | |
| `call-core` | ✅ | ✅ | ✅ | |
| `s8.from_i32` | ✅ | ✅ | ✅ | |
| `s8.from_i64` | ✅ | ✅ | ✅ | |
| `s16.from_i32` | ✅ | ✅ | ✅ | |
| `s16.from_i64` | ✅ | ✅ | ✅ | |
| `s32.from_i32` | ✅ | ✅ | ✅ | |
| `s32.from_i64` | ✅ | ✅ | ✅ | |
| `s64.from_i32` | ✅ | ✅ | ✅ | |
| `s64.from_i64` | ✅ | ✅ | ✅ | |
| `i32.from_s8` | ✅ | ✅ | ✅ | |
| `i32.from_s16` | ✅ | ✅ | ✅ | |
| `i32.from_s32` | ✅ | ✅ | ✅ | |
| `i32.from_s64` | ✅ | ✅ | ✅ | |
| `i64.from_s8` | ✅ | ✅ | ✅ | |
| `i64.from_s16` | ✅ | ✅ | ✅ | |
| `i64.from_s32` | ✅ | ✅ | ✅ | |
| `i64.from_s64` | ✅ | ✅ | ✅ | |
| `u8.from_i32` | ✅ | ✅ | ✅ | |
| `u8.from_i64` | ✅ | ✅ | ✅ | |
| `u16.from_i32` | ✅ | ✅ | ✅ | |
| `u16.from_i64` | ✅ | ✅ | ✅ | |
| `u32.from_i32` | ✅ | ✅ | ✅ | |
| `u32.from_i64` | ✅ | ✅ | ✅ | |
| `u64.from_i32` | ✅ | ✅ | ✅ | |
| `u64.from_i64` | ✅ | ✅ | ✅ | |
| `i32.from_u8` | ✅ | ✅ | ✅ | |
| `i32.from_u16` | ✅ | ✅ | ✅ | |
| `i32.from_u32` | ✅ | ✅ | ✅ | |
| `i32.from_u64` | ✅ | ✅ | ✅ | |
| `i64.from_u8` | ✅ | ✅ | ✅ | |
| `i64.from_u16` | ✅ | ✅ | ✅ | |
| `i64.from_u32` | ✅ | ✅ | ✅ | |
| `i64.from_u64` | ✅ | ✅ | ✅ | |
| `string.lift_memory` | ✅ | ✅ | ✅ | `#memidx` is not supported; `#encoding` is not supported but UTF-8 is assumed |
| `string.lower_memory` | ✅ | ✅ | ✅ | `#memidx` is not supported; `#encoding` is not supported but UTF-8 is assumed |
| `string.size` | ✅ | ✅ | ✅ | `#encoding` is not supported but UTF-8 is assumed |
| `record.lift` | ✅ | ✅ | ✅ | |
| `record.lower` | ✅ | ✅ | ✅ | |
| `call-adapter` | ❌ | ❌ | ❌ | |
| `defer-call-core` | ❌ | ❌ | ❌ | |