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49 lines
1.4 KiB
49 lines
1.4 KiB
4 years ago
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use crate::instr::{Cond};
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use crate::data::{Mask, Register};
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use thiserror::Error;
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use std::borrow::Cow;
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/// csn_asm unified error type
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#[derive(Error,Debug)]
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pub enum Error {
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#[error("S-expression syntax error: {0:?}")]
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PreParse(#[from] Box<sexp::Error>),
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#[error("Parse error: {0:?}")]
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Parse(Cow<'static, str>),
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#[error("Parse error in {1:?}: {0:?}")]
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ParseIn(Cow<'static, str>, sexp::Sexp),
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#[error("Assembler error: {0:?}")]
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Asm(AsmError),
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#[error("Architecture error: {0:?}")]
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Arch(ArchError),
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#[error(transparent)]
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Other(#[from] anyhow::Error),
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}
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/// Error from the assembler stage (after parsing S-expressions and basic validation)
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#[derive(Error,Debug)]
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pub enum AsmError {
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#[error("Unknown instruction")]
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UnknownInstruction,
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#[error("Bad bit mask")]
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BadMask(Mask),
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#[error("Uneven operand size")]
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UnevenOperandSize(Mask, Mask),
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#[error("Value provided as output argument")]
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ValueAsOutput,
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#[error("Conditional branch already defined for \"{0}\"")]
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ConditionalAlreadyUsed(Cond),
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}
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/// Architectural error - the code is syntactically OK, but cannot run
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#[derive(Error,Debug)]
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pub enum ArchError {
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#[error("Register {0} does not exist")]
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RegisterNotExist(Register),
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#[error("Register {0} is not writable")]
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RegisterNotWritable(Register),
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#[error("Register {0} is not readable")]
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RegisterNotReadable(Register),
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}
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