Wasm Proposals

This document is intended to describe the current status of WebAssembly proposals and WASI proposals in WAMR.

Only track proposals that are followed in the WebAssembly proposals and WASI proposals.

Normally, the document tracks proposals that are in phase 4. However, if a proposal in an earlier phase receives support, it will be added to the list below.

The status represents the configuration product-mini/platforms/linux/CMakeLists.txt. There may be minor differences between the top-level CMakeLists and platform-specific CMakeLists.

Users can turn those features on or off by using compilation options. If a relevant compilation option is not available(N/A), it indicates that the feature is permanently enabled.

On-by-default Wasm Proposals

Proposal	>= Phase 4	Compilation Option
Bulk memory operations	Yes	`WAMR_BUILD_BULK_MEMORY`
Fixed-width SIMD[^1]	Yes	`WAMR_BUILD_SIMD`
Multi-value	Yes	N/A
Non-trapping float-to-int conversions	Yes	N/A
Reference Types	Yes	`WAMR_BUILD_REF_TYPES`
Sign-extension operators	Yes	N/A
WebAssembly C and C++ API	No	N/A

[^1]: llvm-jit and aot only.

Off-by-default Wasm Proposals

Proposal	>= Phase 4	Compilation Option
Garbage collection	Yes	`WAMR_BUILD_GC`
Legacy Exception handling[^2]	No	`WAMR_BUILD_EXCE_HANDLING`
Memory64	Yes	`WAMR_BUILD_MEMORY64`
Multiple memories[^3]	Yes	`WAMR_BUILD_MULTI_MEMORY`
Reference-Typed Strings	No	`WAMR_BUILD_STRINGREF`
Tail call	Yes	`WAMR_BUILD_TAIL_CALL`
Threads[^4]	Yes	`WAMR_BUILD_SHARED_MEMORY`
Typed Function References	Yes	`WAMR_BUILD_GC`

[^2]:

interpreter only. [a legacy version](https://github.com/WebAssembly/exception-handling/blob/main/proposals/exception-handling/legacy/Exceptions.md).
This proposal is currently also known as the "legacy proposal" and still
supported in the web, but can be deprecated in future and the use of
this proposal is discouraged.

[^3]: interpreter only [^4]: WAMR_BUILD_LIB_PTHREAD can also be used to enable

Unimplemented Wasm Proposals

Proposal	>= Phase 4
Branch Hinting	Yes
Custom Annotation Syntax in the Text Format	Yes
Exception handling[^5]	Yes
Extended Constant Expressions	Yes
Import/Export of Mutable Globals	Yes
JS String Builtins	Yes
Relaxed SIMD	Yes

[^5]: up-to-date version

On-by-default WASI Proposals

Proposal	>= Phase 4	Compilation Option

Off-by-default WASI Proposals

Proposal	>= Phase 4	Compilation Option
Machine Learning (wasi-nn)	No	`WAMR_BUILD_WASI_NN`
Threads	No	`WAMR_BUILD_LIB_WASI_THREADS`

Unimplemented WASI Proposals

Proposal	>= Phase 4

WAMR features

WAMR offers a variety of customizable features to create a highly efficient runtime. For more details, please refer to build_wamr.

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