Crate wasmtime_runtime

Runtime library support for Wasmtime.

Modules

libcalls

Runtime library calls. Note that wasm compilers may sometimes perform these inline rather than calling them, particularly when CPUs have special instructions which compute them directly.

Structs

GdbJitImageRegistration	Registeration for JIT image
Imports	Resolved import pointers.
InstanceHandle	A handle holding an Instance of a WebAssembly module.
LinkError	An link error while instantiating a module.
Mmap	A simple struct consisting of a page-aligned pointer to page-aligned and initially-zeroed memory and a length.
SignatureRegistry	WebAssembly requires that the caller and callee signatures in an indirect call must match. To implement this efficiently, keep a registry of all signatures, shared by all instances, so that call sites can just do an index comparison.
TrapRegistrationGuard	RAII guard for deregistering traps
VMCallerCheckedAnyfunc	The VM caller-checked "anyfunc" record, for caller-side signature checking. It consists of the actual function pointer and a signature id to be checked by the caller.
VMContext	The VM "context", which is pointed to by the vmctx arg in Cranelift. This has information about globals, memories, tables, and other runtime state associated with the current instance.
VMFunctionBody	A placeholder byte-sized type which is just used to provide some amount of type safety when dealing with pointers to JIT-compiled function bodies. Note that it's deliberately not Copy, as we shouldn't be carelessly copying function body bytes around.
VMFunctionImport	An imported function.
VMGlobalDefinition	The storage for a WebAssembly global defined within the instance.
VMGlobalImport	The fields compiled code needs to access to utilize a WebAssembly global variable imported from another instance.
VMInvokeArgument	The storage for a WebAssembly invocation argument
VMMemoryDefinition	The fields compiled code needs to access to utilize a WebAssembly linear memory defined within the instance, namely the start address and the size in bytes.
VMMemoryImport	The fields compiled code needs to access to utilize a WebAssembly linear memory imported from another instance.
VMSharedSignatureIndex	An index into the shared signature registry, usable for checking signatures at indirect calls.
VMTableDefinition	The fields compiled code needs to access to utilize a WebAssembly table defined within the instance.
VMTableImport	The fields compiled code needs to access to utilize a WebAssembly table imported from another instance.

Enums

Export	The value of an export passed from one instance to another.
InstantiationError	An error while instantiating a module.

Constants

VERSION

Version number of this crate.

Functions

get_mut_trap_registry	Gets guarded writable reference to traps registry
get_trap_registry	Gets guarded readable reference to traps registry
wasmtime_call⚠	Call the wasm function pointed to by callee, which has no arguments or return values.
wasmtime_call_trampoline⚠	Call the wasm function pointed to by callee. values_vec points to a buffer which holds the incoming arguments, and to which the outgoing return values will be written.
wasmtime_init_eager	This function performs the low-overhead signal handler initialization that we want to do eagerly to ensure a more-deterministic global process state. This is especially relevant for signal handlers since handler ordering depends on installation order: the wasm signal handler must run before the other crash handlers and since POSIX signal handlers work LIFO, this function needs to be called at the end of the startup process, after other handlers have been installed. This function can thus be called multiple times, having no effect after the first call.
wasmtime_init_finish	Assuming EnsureEagerProcessSignalHandlers has already been called, this function performs the full installation of signal handlers which must be performed per-thread. This operation may incur some overhead and so should be done only when needed to use wasm.