Add -Zgraphviz_dark_mode

Many developers use a dark theme with editors and IDEs, but this
typically doesn't extend to graphviz output.

When I bring up a MIR graphviz document, the white background is
strikingly bright. This new option changes the colors used for graphviz
output to work better in dark-themed UIs.

compiler/rustc_graphviz/src/lib.rs

@@ -599,6 +599,7 @@ pub enum RenderOption {
     NoNodeStyles,
 
     Monospace,
+    DarkTheme,
 }
 
 /// Returns vec holding all the default render options.
@@ -630,10 +631,23 @@ pub fn render_opts<'a, N, E, G, W>(g: &'a G, w: &mut W, options: &[RenderOption]
     writeln!(w, "digraph {} {{", g.graph_id().as_slice())?;
 
     // Global graph properties
+    let mut graph_attrs = Vec::new();
+    let mut content_attrs = Vec::new();
     if options.contains(&RenderOption::Monospace) {
-        writeln!(w, r#"    graph[fontname="monospace"];"#)?;
-        writeln!(w, r#"    node[fontname="monospace"];"#)?;
-        writeln!(w, r#"    edge[fontname="monospace"];"#)?;
+        let font = r#"fontname="monospace""#;
+        graph_attrs.push(font);
+        content_attrs.push(font);
+    };
+    if options.contains(&RenderOption::DarkTheme) {
+        graph_attrs.push(r#"bgcolor="black""#);
+        content_attrs.push(r#"color="white""#);
+        content_attrs.push(r#"fontcolor="white""#);
+    }
+    if !(graph_attrs.is_empty() && content_attrs.is_empty()) {
+        writeln!(w, r#"    graph[{}];"#, graph_attrs.join(" "))?;
+        let content_attrs_str = content_attrs.join(" ");
+        writeln!(w, r#"    node[{}];"#, content_attrs_str)?;
+        writeln!(w, r#"    edge[{}];"#, content_attrs_str)?;
     }
 
     for n in g.nodes().iter() {

compiler/rustc_mir/src/dataflow/framework/engine.rs

@@ -306,7 +306,11 @@ fn write_graphviz_results<A>(
     let mut buf = Vec::new();
 
     let graphviz = graphviz::Formatter::new(body, def_id, results, style);
-    dot::render_opts(&graphviz, &mut buf, &[dot::RenderOption::Monospace])?;
+    let mut render_opts = vec![dot::RenderOption::Monospace];
+    if tcx.sess.opts.debugging_opts.graphviz_dark_mode {
+        render_opts.push(dot::RenderOption::DarkTheme);
+    }
+    dot::render_opts(&graphviz, &mut buf, &render_opts)?;
 
     if let Some(parent) = path.parent() {
         fs::create_dir_all(parent)?;

compiler/rustc_mir/src/util/graphviz.rs

@@ -55,16 +55,28 @@ pub fn write_mir_fn_graphviz<'tcx, W>(
     writeln!(w, "{} {}Mir_{} {{", kind, cluster, def_name)?;
 
     // Global graph properties
-    writeln!(w, r#"    graph [fontname="monospace"];"#)?;
-    writeln!(w, r#"    node [fontname="monospace"];"#)?;
-    writeln!(w, r#"    edge [fontname="monospace"];"#)?;
+    let font = r#"fontname="monospace""#;
+    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""#);
+        content_attrs.push(r#"color="white""#);
+        content_attrs.push(r#"fontcolor="white""#);
+    }
+
+    writeln!(w, r#"    graph [{}];"#, graph_attrs.join(" "))?;
+    let content_attrs_str = content_attrs.join(" ");
+    writeln!(w, r#"    node [{}];"#, content_attrs_str)?;
+    writeln!(w, r#"    edge [{}];"#, content_attrs_str)?;
 
     // Graph label
     write_graph_label(tcx, def_id, body, w)?;
 
     // Nodes
     for (block, _) in body.basic_blocks().iter_enumerated() {
-        write_node(def_id, block, body, w)?;
+        write_node(def_id, block, body, dark_mode, w)?;
     }
 
     // Edges
@@ -84,6 +96,7 @@ pub fn write_mir_fn_graphviz<'tcx, W>(
 pub fn write_node_label<W: Write, INIT, FINI>(
     block: BasicBlock,
     body: &Body<'_>,
+    dark_mode: bool,
     w: &mut W,
     num_cols: u32,
     init: INIT,
@@ -100,8 +113,9 @@ pub fn write_node_label<W: Write, INIT, FINI>(
     // Basic block number at the top.
     write!(
         w,
-        r#"<tr><td {attrs} colspan="{colspan}">{blk}</td></tr>"#,
-        attrs = r#"bgcolor="gray" align="center""#,
+        r#"<tr><td bgcolor="{bgcolor}" {attrs} colspan="{colspan}">{blk}</td></tr>"#,
+        bgcolor = if dark_mode { "dimgray" } else { "gray" },
+        attrs = r#"align="center""#,
         colspan = num_cols,
         blk = block.index()
     )?;
@@ -134,11 +148,12 @@ fn write_node<W: Write>(
     def_id: DefId,
     block: BasicBlock,
     body: &Body<'_>,
+    dark_mode: bool,
     w: &mut W,
 ) -> io::Result<()> {
     // Start a new node with the label to follow, in one of DOT's pseudo-HTML tables.
     write!(w, r#"    {} [shape="none", label=<"#, node(def_id, block))?;
-    write_node_label(block, body, w, 1, |_| Ok(()), |_| Ok(()))?;
+    write_node_label(block, body, dark_mode, w, 1, |_| Ok(()), |_| Ok(()))?;
     // Close the node label and the node itself.
     writeln!(w, ">];")
 }

compiler/rustc_session/src/options.rs

@@ -907,6 +907,8 @@ fn parse_target_feature(slot: &mut String, v: Option<&str>) -> bool {
         "force all crates to be `rustc_private` unstable (default: no)"),
     fuel: Option<(String, u64)> = (None, parse_optimization_fuel, [TRACKED],
         "set the optimization fuel quota for a crate"),
+    graphviz_dark_mode: bool = (false, parse_bool, [UNTRACKED],
+        "use dark-themed colors in graphviz output (default: no)"),
     hir_stats: bool = (false, parse_bool, [UNTRACKED],
         "print some statistics about AST and HIR (default: no)"),
     human_readable_cgu_names: bool = (false, parse_bool, [TRACKED],