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Initial sketch

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This commit is contained in:
Sergey Pepyakin
2017-11-25 22:28:15 +03:00
parent 0b5939e4e7
commit 6a3b9af597
4 changed files with 93 additions and 19 deletions
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35
src/interpreter/mod.rs
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@ -1,11 +1,35 @@
//! WebAssembly interpreter module.
use std::any::TypeId;
/// Custom user error.
pub trait UserError: 'static + ::std::fmt::Display + ::std::fmt::Debug + Clone + PartialEq {
pub trait UserError: 'static + ::std::fmt::Display + ::std::fmt::Debug {
#[doc(hidden)]
fn __private_get_type_id__(&self) -> TypeId {
TypeId::of::<Self>()
}
}
impl UserError {
pub fn downcast_ref<T: UserError>(&self) -> Option<&T> {
if self.__private_get_type_id__() == TypeId::of::<T>() {
unsafe { Some(&*(self as *const UserError as *const T)) }
} else {
None
}
}
pub fn downcast_mut<T: UserError>(&mut self) -> Option<&mut T> {
if self.__private_get_type_id__() == TypeId::of::<T>() {
unsafe { Some(&mut *(self as *mut UserError as *mut T)) }
} else {
None
}
}
}
/// Internal interpreter error.
#[derive(Debug, Clone, PartialEq)]
#[derive(Debug)]
pub enum Error<E> where E: UserError {
/// Program-level error.
Program(String),
@ -38,7 +62,8 @@ pub enum Error<E> where E: UserError {
/// Trap.
Trap(String),
/// Custom user error.
User(E),
User(Box<UserError>),
Other(E),
}
impl<E> Into<String> for Error<E> where E: UserError {
@ -60,6 +85,7 @@ impl<E> Into<String> for Error<E> where E: UserError {
Error::Native(s) => s,
Error::Trap(s) => format!("trap: {}", s),
Error::User(e) => format!("user: {}", e),
Error::Other(_) => panic!("TODO: Remove this arm "),
}
}
}
@ -83,6 +109,7 @@ impl<E> ::std::fmt::Display for Error<E> where E: UserError {
Error::Native(ref s) => write!(f, "Native: {}", s),
Error::Trap(ref s) => write!(f, "Trap: {}", s),
Error::User(ref e) => write!(f, "User: {}", e),
Error::Other(_) => panic!("TODO: Remove this arm "),
}
}
}
@ -99,7 +126,7 @@ impl ::std::fmt::Display for DummyUserError {
impl<U> From<U> for Error<U> where U: UserError + Sized {
fn from(e: U) -> Self {
Error::User(e)
Error::User(Box::new(e))
}
}