Enum ModuleStartup 

pub enum ModuleStartup {
    None,
    Always(EngineOrModuleTypeIndex),
    IfMemoriesNeedInit(EngineOrModuleTypeIndex),
}

Different means of startup for a wasm module.

Variants

None

No startup is necessary.

Always(EngineOrModuleTypeIndex)

Startup is always required, for example to apply active table segments.

The type of the startup function, of wasm signature [] -> [], is provided here.

IfMemoriesNeedInit(EngineOrModuleTypeIndex)

Startup is only required if some linear memory within this module, at runtime, says needs_init() == true.

This special mode of startup indicates that the startup function has no purpose other than to initialize the initial contents of MemoryInitialization::Static linear memories. In this situation if all memories say needs_init() == false then the startup function won’t actually do anything meaning that it can be optimized slightly by skipping it entirely.

Implementations

impl ModuleStartup

pub fn is_none(&self) -> bool

Returns if this is ModuleStartup::None.

Trait Implementations

impl Debug for ModuleStartup

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ModuleStartup

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ModuleStartup

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl TypeTrace for ModuleStartup

fn trace<F, E>(&self, func: &mut F) -> Result<(), E>

where F: FnMut(EngineOrModuleTypeIndex) -> Result<(), E>,

Visit each edge.

fn trace_mut<F, E>(&mut self, func: &mut F) -> Result<(), E>

where F: FnMut(&mut EngineOrModuleTypeIndex) -> Result<(), E>,

Visit each edge, mutably.

fn trace_engine_indices<F, E>(&self, func: &mut F) -> Result<(), E>

where F: FnMut(VMSharedTypeIndex) -> Result<(), E>,

Trace all VMSharedTypeIndex edges, ignoring other edges.

fn canonicalize_for_runtime_usage<F>(&mut self, module_to_engine: &mut F)

where F: FnMut(ModuleInternedTypeIndex) -> VMSharedTypeIndex,

Canonicalize self by rewriting all type references inside self from module-level interned type indices to engine-level interned type indices.

fn is_canonicalized_for_runtime_usage(&self) -> bool

Is this type canonicalized for runtime usage?

fn canonicalize_for_hash_consing<F>( &mut self, rec_group_range: Range<ModuleInternedTypeIndex>, module_to_engine: &mut F, )

where F: FnMut(ModuleInternedTypeIndex) -> VMSharedTypeIndex,

Canonicalize self by rewriting all type references inside self from module-level interned type indices to either engine-level interned type indices or recgroup-relative indices.

fn is_canonicalized_for_hash_consing(&self) -> bool

Is this type canonicalized for hash consing?