diff options
Diffstat (limited to 'src/error')
| -rw-r--r-- | src/error/mod.rs | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/src/error/mod.rs b/src/error/mod.rs index 99f78bb..b6c1e24 100644 --- a/src/error/mod.rs +++ b/src/error/mod.rs @@ -27,9 +27,23 @@ pub type Result<T> = core::result::Result<T, Error>; /// A crate error. #[derive(Clone, Debug)] pub enum Error { - ImmediateTooLarge, + /// The given immediate cannot be encoded. + IllegalImmediate, - InvalidImmediateValue, + /// The given instruction cannot be encoded. + /// + /// Even valid instructions are not valid in *every* case. + /// For example, most shifter operands and instruction predicates are **not** allowed in a Thumb context (with exceptions). + IllegalInstruction, + + /// The given instruction predicate cannot be encoded. + IllegalPredicate, + + /// The given register can currently not be used. + IllegalRegister, + + /// Register name is not known. + UnknownRegister, } impl Display for Error { @@ -37,9 +51,15 @@ impl Display for Error { use Error::*; let message = match *self { - ImmediateTooLarge => "immediate too large", + IllegalImmediate => "illegal immediate value", + + IllegalInstruction => "illegal instruction", + + IllegalPredicate => "illegal instruction predicate", + + IllegalRegister => "register not permitted here", - InvalidImmediateValue => "invalid immediate value", + UnknownRegister => "unknown register", }; f.write_str(message) |