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use gsgdt::GraphvizSettings;
use rustc_graphviz as dot;
use rustc_hir::def_id::DefId;
use rustc_middle::mir::*;
use rustc_middle::ty::TyCtxt;
use std::fmt::Debug;
use std::io::{self, Write};
use super::generic_graph::mir_fn_to_generic_graph;
use super::pretty::dump_mir_def_ids;
/// Write a graphviz DOT graph of a list of MIRs.
pub fn write_mir_graphviz<W>(tcx: TyCtxt<'_>, single: Option<DefId>, w: &mut W) -> io::Result<()>
where
W: Write,
{
let def_ids = dump_mir_def_ids(tcx, single);
let use_subgraphs = def_ids.len() > 1;
if use_subgraphs {
writeln!(w, "digraph __crate__ {{")?;
}
for def_id in def_ids {
let body = &tcx.optimized_mir(def_id);
write_mir_fn_graphviz(tcx, body, use_subgraphs, w)?;
}
if use_subgraphs {
writeln!(w, "}}")?;
}
Ok(())
}
/// Write a graphviz DOT graph of the MIR.
pub fn write_mir_fn_graphviz<'tcx, W>(
tcx: TyCtxt<'tcx>,
body: &Body<'_>,
subgraph: bool,
w: &mut W,
) -> io::Result<()>
where
W: Write,
{
// Global graph properties
let font = format!(r#"fontname="{}""#, tcx.sess.opts.debugging_opts.graphviz_font);
let mut graph_attrs = vec![&font[..]];
let mut content_attrs = vec![&font[..]];
let dark_mode = tcx.sess.opts.debugging_opts.graphviz_dark_mode;
if dark_mode {
graph_attrs.push(r#"bgcolor="black""#);
graph_attrs.push(r#"fontcolor="white""#);
content_attrs.push(r#"color="white""#);
content_attrs.push(r#"fontcolor="white""#);
}
// Graph label
let mut label = String::from("");
// FIXME: remove this unwrap
write_graph_label(tcx, body, &mut label).unwrap();
let g = mir_fn_to_generic_graph(tcx, body);
let settings = GraphvizSettings {
graph_attrs: Some(graph_attrs.join(" ")),
node_attrs: Some(content_attrs.join(" ")),
edge_attrs: Some(content_attrs.join(" ")),
graph_label: Some(label),
};
g.to_dot(w, &settings, subgraph)
}
/// Write the graphviz DOT label for the overall graph. This is essentially a block of text that
/// will appear below the graph, showing the type of the `fn` this MIR represents and the types of
/// all the variables and temporaries.
fn write_graph_label<'tcx, W: std::fmt::Write>(
tcx: TyCtxt<'tcx>,
body: &Body<'_>,
w: &mut W,
) -> std::fmt::Result {
let def_id = body.source.def_id();
write!(w, "fn {}(", dot::escape_html(&tcx.def_path_str(def_id)))?;
// fn argument types.
for (i, arg) in body.args_iter().enumerate() {
if i > 0 {
write!(w, ", ")?;
}
write!(w, "{:?}: {}", Place::from(arg), escape(&body.local_decls[arg].ty))?;
}
write!(w, ") -> {}", escape(&body.return_ty()))?;
write!(w, r#"<br align="left"/>"#)?;
for local in body.vars_and_temps_iter() {
let decl = &body.local_decls[local];
write!(w, "let ")?;
if decl.mutability == Mutability::Mut {
write!(w, "mut ")?;
}
write!(w, r#"{:?}: {};<br align="left"/>"#, Place::from(local), escape(&decl.ty))?;
}
for var_debug_info in &body.var_debug_info {
write!(
w,
r#"debug {} => {};<br align="left"/>"#,
var_debug_info.name,
escape(&var_debug_info.value),
)?;
}
Ok(())
}
fn escape<T: Debug>(t: &T) -> String {
dot::escape_html(&format!("{:?}", t))
}
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