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Document conditions where NotResumable and AlreadyStarted error is returned

This commit is contained in:
Wei Tang 2018-07-09 23:32:30 +08:00
parent add6037e10
commit 0f0a28e9bd
1 changed files with 15 additions and 2 deletions
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17
src/func.rs
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@ -199,8 +199,21 @@ pub enum ResumableError {
/// Trap happened.
Trap(Trap),
/// The invocation is not resumable.
///
/// Invocations are only resumable if a host function is called, and the host function returns a trap of `Host` kind. For other cases, this error will be returned. This includes:
/// - The invocation is directly a host function.
/// - The invocation has not been started.
/// - The invocation returns normally or returns any trap other than `Host` kind.
///
/// This error is returned by [`resume_execution`].
///
/// [`resume_execution`]: struct.FuncInvocation.html#method.resume_execution
NotResumable,
/// The invocation has already been started.
///
/// This error is returned by [`start_execution`].
///
/// [`start_execution`]: struct.FuncInvocation.html#method.start_execution
AlreadyStarted,
}
@ -271,8 +284,8 @@ impl<'args> FuncInvocation<'args> {
/// `UnexpectedSignature` trap will be returned. The current invocation must also be resumable
/// [`is_resumable`]. Otherwise, a `NotResumable` error will be returned.
///
/// [`resumable_value_type`]: struct.FuncInvocation.html#method.resumable_value_type
/// [`is_resumable`]: struct.FuncInvocation.html#method.is_resumable
/// [`resumable_value_type`]: #method.resumable_value_type
/// [`is_resumable`]: #method.is_resumable
pub fn resume_execution<'externals, E: Externals + 'externals>(&mut self, return_val: Option<RuntimeValue>, externals: &'externals mut E) -> Result<Option<RuntimeValue>, ResumableError> {
match self.kind {
FuncInvocationKind::Internal(ref mut interpreter) => {