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37 changes: 37 additions & 0 deletions aztec_macros/src/lib.rs
Original file line number Diff line number Diff line change
Expand Up @@ -31,10 +31,15 @@ impl MacroProcessor for AztecMacro {
}
}

const FUNCTION_TREE_HEIGHT: u32 = 5;
const MAX_CONTRACT_FUNCTIONS: usize = 2_usize.pow(FUNCTION_TREE_HEIGHT);
Comment on lines +34 to +35
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Should we have circuits.js/src/scripts/constants.in.ts spit out a .rs file in noir with this data?

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yes - very good point

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#[derive(Debug, Clone)]
pub enum AztecMacroError {
AztecNotFound,
AztecComputeNoteHashAndNullifierNotFound { span: Span },
AztecContractHasTooManyFunctions { span: Span },
AztecContractConstructorMissing { span: Span },
}

impl From<AztecMacroError> for MacroError {
Expand All @@ -50,6 +55,16 @@ impl From<AztecMacroError> for MacroError {
secondary_message: None,
span: Some(span),
},
AztecMacroError::AztecContractHasTooManyFunctions { span } => MacroError {
primary_message: format!("Contract can only have a maximum of {} functions", MAX_CONTRACT_FUNCTIONS),
secondary_message: None,
span: Some(span),
},
AztecMacroError::AztecContractConstructorMissing { span } => MacroError {
primary_message: "Contract must have a constructor function".to_owned(),
secondary_message: None,
span: Some(span),
},
}
}
}
Expand Down Expand Up @@ -340,6 +355,28 @@ fn transform_module(
has_transformed_module = true;
}
}

if has_transformed_module {
// We only want to run these checks if the macro processor has found the module to be an Aztec contract.

if module.functions.len() > MAX_CONTRACT_FUNCTIONS {
let crate_graph = &context.crate_graph[crate_id];
return Err((
AztecMacroError::AztecContractHasTooManyFunctions { span: Span::default() }.into(),
crate_graph.root_file_id,
));
}

let constructor_defined = module.functions.iter().any(|func| func.name() == "constructor");
if !constructor_defined {
let crate_graph = &context.crate_graph[crate_id];
return Err((
AztecMacroError::AztecContractConstructorMissing { span: Span::default() }.into(),
crate_graph.root_file_id,
));
}
}

Ok(has_transformed_module)
}

Expand Down