Struct WasmFeatures

pub struct WasmFeatures(/* private fields */);

Flags for features that are enabled for validation.

Implementations

impl WasmFeatures

pub const MUTABLE_GLOBAL: WasmFeatures = _

The WebAssembly mutable-global proposal. Defaults to true.

pub const SATURATING_FLOAT_TO_INT: WasmFeatures = _

The WebAssembly saturating-float-to-int proposal. Defaults to true.

pub const SIGN_EXTENSION: WasmFeatures = _

The WebAssembly sign-extension-ops proposal. Defaults to true.

pub const REFERENCE_TYPES: WasmFeatures = _

The WebAssembly reference types proposal. Defaults to true.

pub const MULTI_VALUE: WasmFeatures = _

The WebAssembly multi-value proposal. Defaults to true.

pub const BULK_MEMORY: WasmFeatures = _

The WebAssembly bulk memory operations proposal. Defaults to true.

pub const SIMD: WasmFeatures = _

The WebAssembly SIMD proposal. Defaults to true.

pub const RELAXED_SIMD: WasmFeatures = _

The WebAssembly Relaxed SIMD proposal. Defaults to true.

pub const THREADS: WasmFeatures = _

The WebAssembly threads proposal. Defaults to true.

pub const SHARED_EVERYTHING_THREADS: WasmFeatures = _

The WebAssembly shared-everything-threads proposal; includes new component model built-ins. Defaults to false.

pub const TAIL_CALL: WasmFeatures = _

The WebAssembly tail-call proposal. Defaults to true.

pub const FLOATS: WasmFeatures = _

Whether or not floating-point instructions are enabled.

This is enabled by default can be used to disallow floating-point operators and types.

This does not correspond to a WebAssembly proposal but is instead intended for embeddings which have stricter-than-usual requirements about execution. Floats in WebAssembly can have different NaN patterns across hosts which can lead to host-dependent execution which some runtimes may not desire. Defaults to true.

pub const MULTI_MEMORY: WasmFeatures = _

The WebAssembly multi memory proposal. Defaults to true.

pub const EXCEPTIONS: WasmFeatures = _

The WebAssembly exception handling proposal. Defaults to false.

pub const MEMORY64: WasmFeatures = _

The WebAssembly memory64 proposal. Defaults to false.

pub const EXTENDED_CONST: WasmFeatures = _

The WebAssembly extended_const proposal. Defaults to true.

pub const COMPONENT_MODEL: WasmFeatures = _

The WebAssembly component model proposal. Defaults to true.

pub const FUNCTION_REFERENCES: WasmFeatures = _

The WebAssembly typed function references proposal. Defaults to false.

pub const MEMORY_CONTROL: WasmFeatures = _

The WebAssembly memory control proposal. Defaults to false.

pub const GC: WasmFeatures = _

The WebAssembly gc proposal. Defaults to false.

pub const CUSTOM_PAGE_SIZES: WasmFeatures = _

The WebAssembly custom-page-sizes proposal. Defaults to false.

pub const COMPONENT_MODEL_VALUES: WasmFeatures = _

Support for the value type in the component model proposal. Defaults to false.

pub const COMPONENT_MODEL_NESTED_NAMES: WasmFeatures = _

Support for the nested namespaces and projects in component model names. Defaults to false.

pub const COMPONENT_MODEL_MORE_FLAGS: WasmFeatures = _

Support for more than 32 flags per-type in the component model. Defaults to false.

pub const COMPONENT_MODEL_MULTIPLE_RETURNS: WasmFeatures = _

Support for multiple return values in a component model function. Defaults to false.

pub const LEGACY_EXCEPTIONS: WasmFeatures = _

The WebAssembly legacy exception handling proposal (phase 1)

Note

Support this feature as long as all leading browsers also support it https://github.com/WebAssembly/exception-handling/blob/main/proposals/exception-handling/legacy/Exceptions.md Defaults to false.

impl WasmFeatures

pub const fn empty() -> WasmFeatures

Get a flags value with all bits unset.

pub const fn all() -> WasmFeatures

Get a flags value with all known bits set.

pub const fn bits(&self) -> u32

Get the underlying bits value.

The returned value is exactly the bits set in this flags value.

pub const fn from_bits(bits: u32) -> Option<WasmFeatures>

Convert from a bits value.

This method will return None if any unknown bits are set.

pub const fn from_bits_truncate(bits: u32) -> WasmFeatures

Convert from a bits value, unsetting any unknown bits.

pub const fn from_bits_retain(bits: u32) -> WasmFeatures

Convert from a bits value exactly.

pub fn from_name(name: &str) -> Option<WasmFeatures>

Get a flags value with the bits of a flag with the given name set.

This method will return None if name is empty or doesn’t correspond to any named flag.

pub const fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

pub const fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

pub const fn intersects(&self, other: WasmFeatures) -> bool

Whether any set bits in a source flags value are also set in a target flags value.

pub const fn contains(&self, other: WasmFeatures) -> bool

Whether all set bits in a source flags value are also set in a target flags value.

pub fn insert(&mut self, other: WasmFeatures)

The bitwise or (|) of the bits in two flags values.

pub fn remove(&mut self, other: WasmFeatures)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. remove won’t truncate other, but the ! operator will.

pub fn toggle(&mut self, other: WasmFeatures)

The bitwise exclusive-or (^) of the bits in two flags values.

pub fn set(&mut self, other: WasmFeatures, value: bool)

Call insert when value is true or remove when value is false.

pub const fn intersection(self, other: WasmFeatures) -> WasmFeatures

The bitwise and (&) of the bits in two flags values.

pub const fn union(self, other: WasmFeatures) -> WasmFeatures

The bitwise or (|) of the bits in two flags values.

pub const fn difference(self, other: WasmFeatures) -> WasmFeatures

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

pub const fn symmetric_difference(self, other: WasmFeatures) -> WasmFeatures

The bitwise exclusive-or (^) of the bits in two flags values.

pub const fn complement(self) -> WasmFeatures

The bitwise negation (!) of the bits in a flags value, truncating the result.

impl WasmFeatures

pub const fn iter(&self) -> Iter<WasmFeatures>

Yield a set of contained flags values.

Each yielded flags value will correspond to a defined named flag. Any unknown bits will be yielded together as a final flags value.

pub const fn iter_names(&self) -> IterNames<WasmFeatures>

Yield a set of contained named flags values.

This method is like iter, except only yields bits in contained named flags. Any unknown bits, or bits not corresponding to a contained flag will not be yielded.

impl WasmFeatures

pub fn from_inflated(inflated: WasmFeaturesInflated) -> WasmFeatures

Construct a bit-packed WasmFeatures from the inflated struct version.

pub fn inflate(&self) -> WasmFeaturesInflated

Inflate these bit-packed features into a struct with a field per feature.

Although the inflated struct takes up much more memory than the bit-packed version, its fields can be exhaustively matched upon. This makes it useful for temporarily checking against, while keeping the bit-packed version as the method of storing the features for longer periods of time.

pub fn mutable_global(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn saturating_float_to_int(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn sign_extension(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn reference_types(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn multi_value(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn bulk_memory(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn simd(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn relaxed_simd(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn threads(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn shared_everything_threads(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn tail_call(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn floats(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn multi_memory(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn exceptions(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn memory64(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn extended_const(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn component_model(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn function_references(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn memory_control(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn gc(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn custom_page_sizes(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn component_model_values(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn component_model_nested_names(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn component_model_more_flags(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn component_model_multiple_returns(&self) -> bool

Returns whether this feature is enabled in this feature set.

pub fn legacy_exceptions(&self) -> bool

Returns whether this feature is enabled in this feature set.

Trait Implementations

impl Binary for WasmFeatures

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl BitAnd for WasmFeatures

fn bitand(self, other: WasmFeatures) -> WasmFeatures

The bitwise and (&) of the bits in two flags values.

type Output = WasmFeatures

The resulting type after applying the & operator.

impl BitAndAssign for WasmFeatures

fn bitand_assign(&mut self, other: WasmFeatures)

The bitwise and (&) of the bits in two flags values.

impl BitOr for WasmFeatures

fn bitor(self, other: WasmFeatures) -> WasmFeatures

The bitwise or (|) of the bits in two flags values.

type Output = WasmFeatures

The resulting type after applying the | operator.

impl BitOrAssign for WasmFeatures

fn bitor_assign(&mut self, other: WasmFeatures)

The bitwise or (|) of the bits in two flags values.

impl BitXor for WasmFeatures

fn bitxor(self, other: WasmFeatures) -> WasmFeatures

The bitwise exclusive-or (^) of the bits in two flags values.

type Output = WasmFeatures

The resulting type after applying the ^ operator.

impl BitXorAssign for WasmFeatures

fn bitxor_assign(&mut self, other: WasmFeatures)

The bitwise exclusive-or (^) of the bits in two flags values.

impl Clone for WasmFeatures

fn clone(&self) -> WasmFeatures

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for WasmFeatures

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for WasmFeatures

fn default() -> WasmFeatures

Returns the “default value” for a type.

impl Extend<WasmFeatures> for WasmFeatures

fn extend<T>(&mut self, iterator: T)

where T: IntoIterator<Item = WasmFeatures>,

The bitwise or (|) of the bits in each flags value.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)

Reserves capacity in a collection for the given number of additional elements.

impl Flags for WasmFeatures

const FLAGS: &'static [Flag<WasmFeatures>] = _

The set of defined flags.

type Bits = u32

The underlying bits type.

fn bits(&self) -> u32

Get the underlying bits value.

fn from_bits_retain(bits: u32) -> WasmFeatures

Convert from a bits value exactly.

fn empty() -> Self

Get a flags value with all bits unset.

fn all() -> Self

Get a flags value with all known bits set.

fn from_bits(bits: Self::Bits) -> Option<Self>

Convert from a bits value.

fn from_bits_truncate(bits: Self::Bits) -> Self

Convert from a bits value, unsetting any unknown bits.

fn from_name(name: &str) -> Option<Self>

Get a flags value with the bits of a flag with the given name set.

fn iter(&self) -> Iter<Self>

Yield a set of contained flags values.

fn iter_names(&self) -> IterNames<Self>

Yield a set of contained named flags values.

fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

fn intersects(&self, other: Self) -> bool

where Self: Sized,

Whether any set bits in a source flags value are also set in a target flags value.

fn contains(&self, other: Self) -> bool

where Self: Sized,

Whether all set bits in a source flags value are also set in a target flags value.

fn insert(&mut self, other: Self)

where Self: Sized,

The bitwise or (|) of the bits in two flags values.

fn remove(&mut self, other: Self)

where Self: Sized,

The intersection of a source flags value with the complement of a target flags value (&!).

fn toggle(&mut self, other: Self)

where Self: Sized,

The bitwise exclusive-or (^) of the bits in two flags values.

fn set(&mut self, other: Self, value: bool)

where Self: Sized,

Call Flags::insert when value is true or Flags::remove when value is false.

fn intersection(self, other: Self) -> Self

The bitwise and (&) of the bits in two flags values.

fn union(self, other: Self) -> Self

The bitwise or (|) of the bits in two flags values.

fn difference(self, other: Self) -> Self

The intersection of a source flags value with the complement of a target flags value (&!).

fn symmetric_difference(self, other: Self) -> Self

The bitwise exclusive-or (^) of the bits in two flags values.

fn complement(self) -> Self

The bitwise negation (!) of the bits in a flags value, truncating the result.

impl From<WasmFeatures> for WasmFeaturesInflated

fn from(features: WasmFeatures) -> WasmFeaturesInflated

Converts to this type from the input type.

impl From<WasmFeaturesInflated> for WasmFeatures

fn from(inflated: WasmFeaturesInflated) -> WasmFeatures

Converts to this type from the input type.

impl FromIterator<WasmFeatures> for WasmFeatures

fn from_iter<T>(iterator: T) -> WasmFeatures

where T: IntoIterator<Item = WasmFeatures>,

The bitwise or (|) of the bits in each flags value.

impl Hash for WasmFeatures

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl IntoIterator for WasmFeatures

type Item = WasmFeatures

The type of the elements being iterated over.

type IntoIter = Iter<WasmFeatures>

Which kind of iterator are we turning this into?

fn into_iter(self) -> <WasmFeatures as IntoIterator>::IntoIter

Creates an iterator from a value.

impl LowerHex for WasmFeatures

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Not for WasmFeatures

fn not(self) -> WasmFeatures

The bitwise negation (!) of the bits in a flags value, truncating the result.

type Output = WasmFeatures

The resulting type after applying the ! operator.

impl Octal for WasmFeatures

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Sub for WasmFeatures

fn sub(self, other: WasmFeatures) -> WasmFeatures

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

type Output = WasmFeatures

The resulting type after applying the - operator.

impl SubAssign for WasmFeatures

fn sub_assign(&mut self, other: WasmFeatures)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

impl UpperHex for WasmFeatures

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Copy for WasmFeatures