80 lines
2.4 KiB
Rust
80 lines
2.4 KiB
Rust
//! The `CFGPrinter` utility.
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use core::fmt::{Display, Formatter, Result, Write};
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use std::vec::Vec;
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use crate::entity::SecondaryMap;
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use crate::flowgraph::{BasicBlock, ControlFlowGraph};
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use crate::ir::Function;
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use crate::write::{FuncWriter, PlainWriter};
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/// A utility for pretty-printing the CFG of a `Function`.
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pub struct CFGPrinter<'a> {
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func: &'a Function,
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cfg: ControlFlowGraph,
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}
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/// A utility for pretty-printing the CFG of a `Function`.
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impl<'a> CFGPrinter<'a> {
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/// Create a new CFGPrinter.
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pub fn new(func: &'a Function) -> Self {
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Self {
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func,
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cfg: ControlFlowGraph::with_function(func),
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}
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}
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/// Write the CFG for this function to `w`.
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pub fn write(&self, w: &mut dyn Write) -> Result {
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self.header(w)?;
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self.ebb_nodes(w)?;
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self.cfg_connections(w)?;
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writeln!(w, "}}")
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}
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fn header(&self, w: &mut dyn Write) -> Result {
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writeln!(w, "digraph \"{}\" {{", self.func.name)?;
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if let Some(entry) = self.func.layout.entry_block() {
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writeln!(w, " {{rank=min; {}}}", entry)?;
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}
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Ok(())
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}
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fn ebb_nodes(&self, w: &mut dyn Write) -> Result {
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let mut aliases = SecondaryMap::<_, Vec<_>>::new();
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for v in self.func.dfg.values() {
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// VADFS returns the immediate target of an alias
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if let Some(k) = self.func.dfg.value_alias_dest_for_serialization(v) {
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aliases[k].push(v);
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}
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}
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for ebb in &self.func.layout {
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write!(w, " {} [shape=record, label=\"{{", ebb)?;
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crate::write::write_ebb_header(w, self.func, None, ebb, 4)?;
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// Add all outgoing branch instructions to the label.
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for inst in self.func.layout.ebb_insts(ebb) {
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write!(w, " | <{}>", inst)?;
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PlainWriter.write_instruction(w, self.func, &aliases, None, inst, 0)?;
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}
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writeln!(w, "}}\"]")?
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}
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Ok(())
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}
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fn cfg_connections(&self, w: &mut dyn Write) -> Result {
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for ebb in &self.func.layout {
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for BasicBlock { ebb: parent, inst } in self.cfg.pred_iter(ebb) {
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writeln!(w, " {}:{} -> {}", parent, inst, ebb)?;
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}
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}
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Ok(())
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}
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}
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impl<'a> Display for CFGPrinter<'a> {
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fn fmt(&self, f: &mut Formatter) -> Result {
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self.write(f)
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}
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}
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