Enum wasmtime_runtime::TrapReason

pub enum TrapReason {
    User {
        error: Error,
        needs_backtrace: bool,
    },
    Jit {
        pc: usize,
        faulting_addr: Option<usize>,
    },
    Wasm(Trap),
}

Enumeration of different methods of raising a trap.

Variants

User

A user-raised trap through raise_user_trap.

Fields

error: Error

The actual user trap error.

needs_backtrace: bool

Whether we need to capture a backtrace for this error or not.

Jit

A trap raised from Cranelift-generated code.

Fields

pc: usize

The program counter where this trap originated.

This is later used with side tables from compilation to translate the trapping address to a trap code.

faulting_addr: Option<usize>

If the trap was a memory-related trap such as SIGSEGV then this field will contain the address of the inaccessible data.

Note that wasm loads/stores are not guaranteed to fill in this information. Dynamically-bounds-checked memories, for example, will not access an invalid address but may instead load from NULL or may explicitly jump to a ud2 instruction. This is only available for fault-based traps which are one of the main ways, but not the only way, to run wasm.

Wasm(Trap)

A trap raised from a wasm libcall

Implementations

impl TrapReason

pub fn user_without_backtrace(error: Error) -> Self

Create a new TrapReason::User that does not have a backtrace yet.

pub fn user_with_backtrace(error: Error) -> Self

Create a new TrapReason::User that already has a backtrace.

pub fn is_jit(&self) -> bool

Is this a JIT trap?

Trait Implementations

impl Debug for TrapReason

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

Formats the value using the given formatter.

impl From<Error> for TrapReason

fn from(err: Error) -> Self

Converts to this type from the input type.

impl From<Trap> for TrapReason

fn from(code: Trap) -> Self

Converts to this type from the input type.