80 lines
2.4 KiB
Rust
80 lines
2.4 KiB
Rust
//! The `CFGPrinter` utility.
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use std::fmt::{Display, Formatter, Result, Write};
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use flowgraph::{BasicBlock, ControlFlowGraph};
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use ir::instructions::BranchInfo;
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use ir::Function;
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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 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 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 Write) -> Result {
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for ebb in &self.func.layout {
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write!(w, " {} [shape=record, label=\"{{{}", ebb, ebb)?;
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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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let idata = &self.func.dfg[inst];
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match idata.analyze_branch(&self.func.dfg.value_lists) {
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BranchInfo::SingleDest(dest, _) => {
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write!(w, " | <{}>{} {}", inst, idata.opcode(), dest)?
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}
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BranchInfo::Table(table, dest) => {
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write!(w, " | <{}>{} {}", inst, idata.opcode(), table)?;
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if let Some(dest) = dest {
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write!(w, " {}", dest)?
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}
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}
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BranchInfo::NotABranch => {}
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}
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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 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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