Wasmer Interface Types

Wasmer is a standalone JIT WebAssembly runtime, aiming to be fully compatible with WASI, Emscripten, Rust and Go. Learn more.

This crate is an implementation of the living WebAssembly Interface Types standard.

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, used by adapters to transform the data between WebAssembly core and the outside world (learn more).

Here is the instructions that are implemented by this crate:

Instruction	WAT encoder/decoder	Binary encoder/decoder	Interpreter	Comment
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	❌	❌	❌