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use dot;
use rustc::hir::def_id::DefId;
use rustc::mir::*;
use rustc::ty::TyCtxt;
use std::fmt::Debug;
use std::io::{self, Write};
use syntax::ast::NodeId;
use rustc_data_structures::indexed_vec::Idx;
pub fn write_mir_graphviz<'a, 'b, 'tcx, W, I>(tcx: TyCtxt<'b, 'tcx, 'tcx>,
iter: I,
w: &mut W)
-> io::Result<()>
where W: Write, I: Iterator<Item=DefId>
{
for def_id in iter {
let nodeid = tcx.hir.as_local_node_id(def_id).unwrap();
let mir = &tcx.item_mir(def_id);
writeln!(w, "digraph Mir_{} {{", nodeid)?;
writeln!(w, r#" graph [fontname="monospace"];"#)?;
writeln!(w, r#" node [fontname="monospace"];"#)?;
writeln!(w, r#" edge [fontname="monospace"];"#)?;
write_graph_label(tcx, nodeid, mir, w)?;
for (block, _) in mir.basic_blocks().iter_enumerated() {
write_node(block, mir, w)?;
}
for (source, _) in mir.basic_blocks().iter_enumerated() {
write_edges(source, mir, w)?;
}
writeln!(w, "}}")?
}
Ok(())
}
pub fn write_node_label<W: Write, INIT, FINI>(block: BasicBlock,
mir: &Mir,
w: &mut W,
num_cols: u32,
init: INIT,
fini: FINI) -> io::Result<()>
where INIT: Fn(&mut W) -> io::Result<()>,
FINI: Fn(&mut W) -> io::Result<()>
{
let data = &mir[block];
write!(w, r#"<table border="0" cellborder="1" cellspacing="0">"#)?;
write!(w, r#"<tr><td {attrs} colspan="{colspan}">{blk}</td></tr>"#,
attrs=r#"bgcolor="gray" align="center""#,
colspan=num_cols,
blk=block.index())?;
init(w)?;
if !data.statements.is_empty() {
write!(w, r#"<tr><td align="left" balign="left">"#)?;
for statement in &data.statements {
write!(w, "{}<br/>", escape(statement))?;
}
write!(w, "</td></tr>")?;
}
let mut terminator_head = String::new();
data.terminator().kind.fmt_head(&mut terminator_head).unwrap();
write!(w, r#"<tr><td align="left">{}</td></tr>"#, dot::escape_html(&terminator_head))?;
fini(w)?;
writeln!(w, "</table>")
}
fn write_node<W: Write>(block: BasicBlock, mir: &Mir, w: &mut W) -> io::Result<()> {
write!(w, r#" {} [shape="none", label=<"#, node(block))?;
write_node_label(block, mir, w, 1, |_| Ok(()), |_| Ok(()))?;
writeln!(w, ">];")
}
fn write_edges<W: Write>(source: BasicBlock, mir: &Mir, w: &mut W) -> io::Result<()> {
let terminator = mir[source].terminator();
let labels = terminator.kind.fmt_successor_labels();
for (&target, label) in terminator.successors().iter().zip(labels) {
writeln!(w, r#" {} -> {} [label="{}"];"#, node(source), node(target), label)?;
}
Ok(())
}
fn write_graph_label<'a, 'tcx, W: Write>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
nid: NodeId,
mir: &Mir,
w: &mut W)
-> io::Result<()> {
write!(w, " label=<fn {}(", dot::escape_html(&tcx.node_path_str(nid)))?;
for (i, arg) in mir.args_iter().enumerate() {
if i > 0 {
write!(w, ", ")?;
}
write!(w, "{:?}: {}", Lvalue::Local(arg), escape(&mir.local_decls[arg].ty))?;
}
write!(w, ") -> {}", escape(mir.return_ty))?;
write!(w, r#"<br align="left"/>"#)?;
for local in mir.vars_and_temps_iter() {
let decl = &mir.local_decls[local];
write!(w, "let ")?;
if decl.mutability == Mutability::Mut {
write!(w, "mut ")?;
}
if let Some(name) = decl.name {
write!(w, r#"{:?}: {}; // {}<br align="left"/>"#,
Lvalue::Local(local), escape(&decl.ty), name)?;
} else {
write!(w, r#"let mut {:?}: {};<br align="left"/>"#,
Lvalue::Local(local), escape(&decl.ty))?;
}
}
writeln!(w, ">;")
}
fn node(block: BasicBlock) -> String {
format!("bb{}", block.index())
}
fn escape<T: Debug>(t: &T) -> String {
dot::escape_html(&format!("{:?}", t))
}