use crate::config::ConfigOption;
use crate::linter::{SyntaxRule, SyntaxRuleResult};
use sv_parser::{unwrap_node, AlwaysKeyword, NodeEvent, RefNode, SyntaxTree};
#[derive(Default)]
pub struct BlockingAssignmentInAlwaysAtEdge;
impl SyntaxRule for BlockingAssignmentInAlwaysAtEdge {
fn check(
&mut self,
_syntax_tree: &SyntaxTree,
event: &NodeEvent,
_option: &ConfigOption,
) -> SyntaxRuleResult {
let node = match event {
NodeEvent::Enter(x) => x,
NodeEvent::Leave(_) => {
return SyntaxRuleResult::Pass;
}
};
match node {
RefNode::AlwaysConstruct(x) => {
let (t, x) = &x.nodes;
match t {
AlwaysKeyword::Always(_) => {
let edge = unwrap_node!(x, EdgeIdentifier);
let blocking_assignment = unwrap_node!(x, BlockingAssignment);
let variable_assignment = unwrap_node!(x, VariableDeclAssignment);
if edge.is_some() && (blocking_assignment.is_some() || variable_assignment.is_some()) {
SyntaxRuleResult::Fail
} else {
SyntaxRuleResult::Pass
}
}
_ => SyntaxRuleResult::Pass,
}
}
_ => SyntaxRuleResult::Pass,
}
}
fn name(&self) -> String {
String::from("blocking_assignment_in_always_at_edge")
}
fn hint(&self, _option: &ConfigOption) -> String {
String::from("Do not use blocking assignments within edge-sensitive `always`.")
}
fn reason(&self) -> String {
String::from("Blocking assignment in `always_ff` may cause undefined event ordering.")
}
}