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|
/// This module provides linkage between rustc::middle::graph and
/// libgraphviz traits.
// For clarity, rename the graphviz crate locally to dot.
use graphviz as dot;
use crate::cfg;
use crate::hir;
use crate::ty::TyCtxt;
pub type Node<'a> = (cfg::CFGIndex, &'a cfg::CFGNode);
pub type Edge<'a> = &'a cfg::CFGEdge;
pub struct LabelledCFG<'a, 'tcx: 'a> {
pub tcx: TyCtxt<'a, 'tcx, 'tcx>,
pub cfg: &'a cfg::CFG,
pub name: String,
/// `labelled_edges` controls whether we emit labels on the edges
pub labelled_edges: bool,
}
impl<'a, 'tcx> LabelledCFG<'a, 'tcx> {
fn local_id_to_string(&self, local_id: hir::ItemLocalId) -> String {
assert!(self.cfg.owner_def_id.is_local());
let node_id = self.tcx.hir().hir_to_node_id(hir::HirId {
owner: self.tcx.hir().def_index_to_hir_id(self.cfg.owner_def_id.index).owner,
local_id
});
let s = self.tcx.hir().node_to_string(node_id);
// Replacing newlines with \\l causes each line to be left-aligned,
// improving presentation of (long) pretty-printed expressions.
if s.contains("\n") {
let mut s = s.replace("\n", "\\l");
// Apparently left-alignment applies to the line that precedes
// \l, not the line that follows; so, add \l at end of string
// if not already present, ensuring last line gets left-aligned
// as well.
let mut last_two: Vec<_> =
s.chars().rev().take(2).collect();
last_two.reverse();
if last_two != ['\\', 'l'] {
s.push_str("\\l");
}
s
} else {
s
}
}
}
impl<'a, 'hir> dot::Labeller<'a> for LabelledCFG<'a, 'hir> {
type Node = Node<'a>;
type Edge = Edge<'a>;
fn graph_id(&'a self) -> dot::Id<'a> { dot::Id::new(&self.name[..]).unwrap() }
fn node_id(&'a self, &(i,_): &Node<'a>) -> dot::Id<'a> {
dot::Id::new(format!("N{}", i.node_id())).unwrap()
}
fn node_label(&'a self, &(i, n): &Node<'a>) -> dot::LabelText<'a> {
if i == self.cfg.entry {
dot::LabelText::LabelStr("entry".into())
} else if i == self.cfg.exit {
dot::LabelText::LabelStr("exit".into())
} else if n.data.id() == hir::DUMMY_ITEM_LOCAL_ID {
dot::LabelText::LabelStr("(dummy_node)".into())
} else {
let s = self.local_id_to_string(n.data.id());
dot::LabelText::EscStr(s.into())
}
}
fn edge_label(&self, e: &Edge<'a>) -> dot::LabelText<'a> {
let mut label = String::new();
if !self.labelled_edges {
return dot::LabelText::EscStr(label.into());
}
let mut put_one = false;
for (i, &id) in e.data.exiting_scopes.iter().enumerate() {
if put_one {
label.push_str(",\\l");
} else {
put_one = true;
}
let s = self.local_id_to_string(id);
label.push_str(&format!("exiting scope_{} {}",
i,
&s[..]));
}
dot::LabelText::EscStr(label.into())
}
}
impl<'a> dot::GraphWalk<'a> for &'a cfg::CFG {
type Node = Node<'a>;
type Edge = Edge<'a>;
fn nodes(&'a self) -> dot::Nodes<'a, Node<'a>> {
let v: Vec<_> = self.graph.enumerated_nodes().collect();
v.into()
}
fn edges(&'a self) -> dot::Edges<'a, Edge<'a>> {
self.graph.all_edges().iter().collect()
}
fn source(&'a self, edge: &Edge<'a>) -> Node<'a> {
let i = edge.source();
(i, self.graph.node(i))
}
fn target(&'a self, edge: &Edge<'a>) -> Node<'a> {
let i = edge.target();
(i, self.graph.node(i))
}
}
impl<'a, 'hir> dot::GraphWalk<'a> for LabelledCFG<'a, 'hir>
{
type Node = Node<'a>;
type Edge = Edge<'a>;
fn nodes(&'a self) -> dot::Nodes<'a, Node<'a>> { self.cfg.nodes() }
fn edges(&'a self) -> dot::Edges<'a, Edge<'a>> { self.cfg.edges() }
fn source(&'a self, edge: &Edge<'a>) -> Node<'a> { self.cfg.source(edge) }
fn target(&'a self, edge: &Edge<'a>) -> Node<'a> { self.cfg.target(edge) }
}
|
