Enum wasmtime_environ::InitMemory

pub enum InitMemory<'a> {
    CompileTime(&'a Module),
    Runtime {
        memory_size_in_pages: &'a dyn Fn(MemoryIndex) -> u64,
        get_global_as_u64: &'a dyn Fn(GlobalIndex) -> u64,
    },
}

Argument to MemoryInitialization::init_memory indicating the current status of the instance.

Variants

CompileTime(&'a Module)

This evaluation of memory initializers is happening at compile time. This means that the current state of memories is whatever their initial state is, and additionally globals are not available if data segments have global offsets.

Runtime

Fields

memory_size_in_pages: &'a dyn Fn(MemoryIndex) -> u64

Returns the size, in wasm pages, of the the memory specified.

get_global_as_u64: &'a dyn Fn(GlobalIndex) -> u64

Returns the value of the global, as a u64. Note that this may involve zero-extending a 32-bit global to a 64-bit number.

Evaluation of memory initializers is happening at runtime when the instance is available, and callbacks are provided to learn about the instance’s state.