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use std::fmt;
use super::ir::*;
impl fmt::Display for SsaBody {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
for block in &self.blocks {
let entry_marker = if block.id == self.entry {
" (entry)"
} else {
""
};
writeln!(f, "Block B{}{entry_marker}:", block.id.0)?;
// Predecessors
if !block.preds.is_empty() {
let preds: Vec<String> = block.preds.iter().map(|p| format!("B{}", p.0)).collect();
writeln!(f, " ; preds: {}", preds.join(", "))?;
}
// Phi instructions
for inst in &block.phis {
write!(f, " v{} = ", inst.value.0)?;
if let SsaOp::Phi(ref operands) = inst.op {
let ops: Vec<String> = operands
.iter()
.map(|(bid, val)| format!("B{}:v{}", bid.0, val.0))
.collect();
write!(f, "phi({})", ops.join(", "))?;
}
if let Some(ref name) = inst.var_name {
write!(f, " # {name}")?;
}
writeln!(f)?;
}
// Body instructions
for inst in &block.body {
write!(f, " v{} = ", inst.value.0)?;
match &inst.op {
SsaOp::Phi(_) => write!(f, "phi(???)")?, // shouldn't appear in body
SsaOp::Assign(uses) => {
let uses_str: Vec<String> =
uses.iter().map(|v| format!("v{}", v.0)).collect();
write!(f, "assign({})", uses_str.join(", "))?;
}
SsaOp::Call {
callee,
args,
receiver,
..
} => {
if let Some(rv) = receiver {
write!(f, "v{}.{callee}(", rv.0)?;
} else {
write!(f, "{callee}(")?;
}
let arg_strs: Vec<String> = args
.iter()
.map(|arg| {
let vs: Vec<String> =
arg.iter().map(|v| format!("v{}", v.0)).collect();
vs.join("+")
})
.collect();
write!(f, "{})", arg_strs.join(", "))?;
}
SsaOp::FieldProj {
receiver,
field,
projected_type,
} => {
// Resolve the field name through the body's interner
// so display output matches the original source field.
let name = self.field_interner.resolve(*field);
if let Some(ty) = projected_type {
write!(f, "field_proj(v{}, {name:?}) :: {ty:?}", receiver.0)?;
} else {
write!(f, "field_proj(v{}, {name:?})", receiver.0)?;
}
}
SsaOp::Source => write!(f, "source()")?,
SsaOp::Const(val) => {
if let Some(v) = val {
write!(f, "const({v})")?;
} else {
write!(f, "const")?;
}
}
SsaOp::Param { index } => write!(f, "param({index})")?,
SsaOp::SelfParam => write!(f, "self_param()")?,
SsaOp::CatchParam => write!(f, "catch_param()")?,
SsaOp::Nop => write!(f, "nop")?,
SsaOp::Undef => write!(f, "undef")?,
}
if let Some(ref name) = inst.var_name {
write!(f, " # {name}")?;
}
// Span info
if inst.span != (0, 0) {
write!(f, " @ {}..{}", inst.span.0, inst.span.1)?;
}
writeln!(f)?;
}
// Terminator
match &block.terminator {
Terminator::Goto(target) => writeln!(f, " goto → B{}", target.0)?,
Terminator::Branch {
true_blk,
false_blk,
..
} => writeln!(
f,
" branch → B{} (true), B{} (false)",
true_blk.0, false_blk.0
)?,
Terminator::Switch {
scrutinee,
targets,
default,
case_values,
} => {
write!(f, " switch v{} → [", scrutinee.0)?;
for (i, t) in targets.iter().enumerate() {
if i > 0 {
write!(f, ", ")?;
}
match case_values.get(i).and_then(|cv| cv.as_ref()) {
Some(lit) => write!(f, "{:?}=B{}", lit, t.0)?,
None => write!(f, "B{}", t.0)?,
}
}
writeln!(f, "] default B{}", default.0)?;
}
Terminator::Return(ret_val) => {
if let Some(v) = ret_val {
writeln!(f, " return v{}", v.0)?
} else {
writeln!(f, " return")?
}
}
Terminator::Unreachable => writeln!(f, " unreachable")?,
}
writeln!(f)?;
}
Ok(())
}
}
impl fmt::Display for SsaValue {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "v{}", self.0)
}
}
impl fmt::Display for BlockId {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "B{}", self.0)
}
}