1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! The various pretty print routines.
13 pub use self::UserIdentifiedItem::*;
14 pub use self::PpSourceMode::*;
15 pub use self::PpMode::*;
16 use self::NodesMatchingUII::*;
18 use rustc_trans::back::link;
22 use rustc::middle::ty;
23 use rustc::middle::cfg;
24 use rustc::middle::cfg::graphviz::LabelledCFG;
25 use rustc::session::Session;
26 use rustc::session::config::Input;
27 use rustc_borrowck as borrowck;
28 use rustc_borrowck::graphviz as borrowck_dot;
29 use rustc_resolve as resolve;
33 use syntax::fold::{self, Folder};
34 use syntax::print::{pp, pprust};
35 use syntax::print::pprust::PrintState;
37 use syntax::util::small_vector::SmallVector;
42 use std::io::{self, Write};
44 use std::path::PathBuf;
45 use std::str::FromStr;
47 use rustc::front::map as hir_map;
48 use rustc::front::map::{blocks, NodePrinter};
50 use rustc_front::lowering::lower_crate;
51 use rustc_front::print::pprust as pprust_hir;
53 #[derive(Copy, Clone, PartialEq, Debug)]
54 pub enum PpSourceMode {
59 PpmExpandedIdentified,
64 #[derive(Copy, Clone, PartialEq, Debug)]
65 pub enum PpFlowGraphMode {
67 /// Drops the labels from the edges in the flowgraph output. This
68 /// is mostly for use in the --unpretty flowgraph run-make tests,
69 /// since the labels are largely uninteresting in those cases and
70 /// have become a pain to maintain.
73 #[derive(Copy, Clone, PartialEq, Debug)]
75 PpmSource(PpSourceMode),
77 PpmFlowGraph(PpFlowGraphMode),
80 pub fn parse_pretty(sess: &Session,
82 extended: bool) -> (PpMode, Option<UserIdentifiedItem>) {
83 let mut split = name.splitn(2, '=');
84 let first = split.next().unwrap();
85 let opt_second = split.next();
86 let first = match (first, extended) {
87 ("normal", _) => PpmSource(PpmNormal),
88 ("identified", _) => PpmSource(PpmIdentified),
89 ("everybody_loops", true) => PpmSource(PpmEveryBodyLoops),
90 ("expanded", _) => PpmSource(PpmExpanded),
91 ("expanded,identified", _) => PpmSource(PpmExpandedIdentified),
92 ("expanded,hygiene", _) => PpmSource(PpmExpandedHygiene),
93 ("hir", true) => PpmHir(PpmNormal),
94 ("hir,identified", true) => PpmHir(PpmExpandedIdentified),
95 ("hir,typed", true) => PpmHir(PpmTyped),
96 ("flowgraph", true) => PpmFlowGraph(PpFlowGraphMode::Default),
97 ("flowgraph,unlabelled", true) => PpmFlowGraph(PpFlowGraphMode::UnlabelledEdges),
101 "argument to `unpretty` must be one of `normal`, \
102 `expanded`, `flowgraph[,unlabelled]=<nodeid>`, `identified`, \
103 `expanded,identified`, `everybody_loops`, `hir`, \
104 `hir,identified`, or `hir,typed`; got {}", name));
107 "argument to `pretty` must be one of `normal`, `expanded`, \
108 `identified`, or `expanded,identified`; got {}", name));
112 let opt_second = opt_second.and_then(|s| s.parse::<UserIdentifiedItem>().ok());
118 // This slightly awkward construction is to allow for each PpMode to
119 // choose whether it needs to do analyses (which can consume the
120 // Session) and then pass through the session (now attached to the
121 // analysis results) on to the chosen pretty-printer, along with the
124 // Note that since the `&PrinterSupport` is freshly constructed on each
125 // call, it would not make sense to try to attach the lifetime of `self`
126 // to the lifetime of the `&PrinterObject`.
128 // (The `use_once_payload` is working around the current lack of once
129 // functions in the compiler.)
132 /// Constructs a `PrinterSupport` object and passes it to `f`.
133 fn call_with_pp_support<'tcx, A, B, F>(&self,
135 ast_map: Option<hir_map::Map<'tcx>>,
138 F: FnOnce(&PrinterSupport, B) -> A,
141 PpmNormal | PpmEveryBodyLoops | PpmExpanded => {
142 let annotation = NoAnn { sess: sess, ast_map: ast_map };
143 f(&annotation, payload)
146 PpmIdentified | PpmExpandedIdentified => {
147 let annotation = IdentifiedAnnotation { sess: sess, ast_map: ast_map };
148 f(&annotation, payload)
150 PpmExpandedHygiene => {
151 let annotation = HygieneAnnotation { sess: sess, ast_map: ast_map };
152 f(&annotation, payload)
154 _ => panic!("Should use call_with_pp_support_hir"),
157 fn call_with_pp_support_hir<'tcx, A, B, F>(&self,
159 ast_map: &hir_map::Map<'tcx>,
160 ast_crate: &ast::Crate,
161 arenas: &'tcx ty::CtxtArenas<'tcx>,
165 F: FnOnce(&HirPrinterSupport, B, &hir::Crate) -> A,
169 let annotation = NoAnn { sess: sess, ast_map: Some(ast_map.clone()) };
170 f(&annotation, payload, &ast_map.forest.krate)
174 let annotation = IdentifiedAnnotation {
176 ast_map: Some(ast_map.clone())
178 f(&annotation, payload, &ast_map.forest.krate)
181 driver::phase_3_run_analysis_passes(sess,
186 resolve::MakeGlobMap::No,
188 let annotation = TypedAnnotation { tcx: tcx };
189 f(&annotation, payload, &ast_map.forest.krate)
192 _ => panic!("Should use call_with_pp_support"),
197 trait PrinterSupport<'ast>: pprust::PpAnn {
198 /// Provides a uniform interface for re-extracting a reference to a
199 /// `Session` from a value that now owns it.
200 fn sess<'a>(&'a self) -> &'a Session;
202 /// Provides a uniform interface for re-extracting a reference to an
203 /// `hir_map::Map` from a value that now owns it.
204 fn ast_map<'a>(&'a self) -> Option<&'a hir_map::Map<'ast>>;
206 /// Produces the pretty-print annotation object.
208 /// (Rust does not yet support upcasting from a trait object to
209 /// an object for one of its super-traits.)
210 fn pp_ann<'a>(&'a self) -> &'a pprust::PpAnn;
213 trait HirPrinterSupport<'ast>: pprust_hir::PpAnn {
214 /// Provides a uniform interface for re-extracting a reference to a
215 /// `Session` from a value that now owns it.
216 fn sess<'a>(&'a self) -> &'a Session;
218 /// Provides a uniform interface for re-extracting a reference to an
219 /// `hir_map::Map` from a value that now owns it.
220 fn ast_map<'a>(&'a self) -> Option<&'a hir_map::Map<'ast>>;
222 /// Produces the pretty-print annotation object.
224 /// (Rust does not yet support upcasting from a trait object to
225 /// an object for one of its super-traits.)
226 fn pp_ann<'a>(&'a self) -> &'a pprust_hir::PpAnn;
231 ast_map: Option<hir_map::Map<'ast>>
234 impl<'ast> PrinterSupport<'ast> for NoAnn<'ast> {
235 fn sess<'a>(&'a self) -> &'a Session { &self.sess }
237 fn ast_map<'a>(&'a self) -> Option<&'a hir_map::Map<'ast>> {
238 self.ast_map.as_ref()
241 fn pp_ann<'a>(&'a self) -> &'a pprust::PpAnn { self }
244 impl<'ast> HirPrinterSupport<'ast> for NoAnn<'ast> {
245 fn sess<'a>(&'a self) -> &'a Session { &self.sess }
247 fn ast_map<'a>(&'a self) -> Option<&'a hir_map::Map<'ast>> {
248 self.ast_map.as_ref()
251 fn pp_ann<'a>(&'a self) -> &'a pprust_hir::PpAnn { self }
254 impl<'ast> pprust::PpAnn for NoAnn<'ast> {}
255 impl<'ast> pprust_hir::PpAnn for NoAnn<'ast> {}
257 struct IdentifiedAnnotation<'ast> {
259 ast_map: Option<hir_map::Map<'ast>>,
262 impl<'ast> PrinterSupport<'ast> for IdentifiedAnnotation<'ast> {
263 fn sess<'a>(&'a self) -> &'a Session { &self.sess }
265 fn ast_map<'a>(&'a self) -> Option<&'a hir_map::Map<'ast>> {
266 self.ast_map.as_ref()
269 fn pp_ann<'a>(&'a self) -> &'a pprust::PpAnn { self }
272 impl<'ast> pprust::PpAnn for IdentifiedAnnotation<'ast> {
274 s: &mut pprust::State,
275 node: pprust::AnnNode) -> io::Result<()> {
277 pprust::NodeExpr(_) => s.popen(),
282 s: &mut pprust::State,
283 node: pprust::AnnNode) -> io::Result<()> {
285 pprust::NodeIdent(_) | pprust::NodeName(_) => Ok(()),
287 pprust::NodeItem(item) => {
288 try!(pp::space(&mut s.s));
289 s.synth_comment(item.id.to_string())
291 pprust::NodeSubItem(id) => {
292 try!(pp::space(&mut s.s));
293 s.synth_comment(id.to_string())
295 pprust::NodeBlock(blk) => {
296 try!(pp::space(&mut s.s));
297 s.synth_comment(format!("block {}", blk.id))
299 pprust::NodeExpr(expr) => {
300 try!(pp::space(&mut s.s));
301 try!(s.synth_comment(expr.id.to_string()));
304 pprust::NodePat(pat) => {
305 try!(pp::space(&mut s.s));
306 s.synth_comment(format!("pat {}", pat.id))
312 impl<'ast> HirPrinterSupport<'ast> for IdentifiedAnnotation<'ast> {
313 fn sess<'a>(&'a self) -> &'a Session { &self.sess }
315 fn ast_map<'a>(&'a self) -> Option<&'a hir_map::Map<'ast>> {
316 self.ast_map.as_ref()
319 fn pp_ann<'a>(&'a self) -> &'a pprust_hir::PpAnn { self }
322 impl<'ast> pprust_hir::PpAnn for IdentifiedAnnotation<'ast> {
324 s: &mut pprust_hir::State,
325 node: pprust_hir::AnnNode) -> io::Result<()> {
327 pprust_hir::NodeExpr(_) => s.popen(),
332 s: &mut pprust_hir::State,
333 node: pprust_hir::AnnNode) -> io::Result<()> {
335 pprust_hir::NodeIdent(_) | pprust_hir::NodeName(_) => Ok(()),
337 pprust_hir::NodeItem(item) => {
338 try!(pp::space(&mut s.s));
339 s.synth_comment(item.id.to_string())
341 pprust_hir::NodeSubItem(id) => {
342 try!(pp::space(&mut s.s));
343 s.synth_comment(id.to_string())
345 pprust_hir::NodeBlock(blk) => {
346 try!(pp::space(&mut s.s));
347 s.synth_comment(format!("block {}", blk.id))
349 pprust_hir::NodeExpr(expr) => {
350 try!(pp::space(&mut s.s));
351 try!(s.synth_comment(expr.id.to_string()));
354 pprust_hir::NodePat(pat) => {
355 try!(pp::space(&mut s.s));
356 s.synth_comment(format!("pat {}", pat.id))
362 struct HygieneAnnotation<'ast> {
364 ast_map: Option<hir_map::Map<'ast>>,
367 impl<'ast> PrinterSupport<'ast> for HygieneAnnotation<'ast> {
368 fn sess<'a>(&'a self) -> &'a Session { &self.sess }
370 fn ast_map<'a>(&'a self) -> Option<&'a hir_map::Map<'ast>> {
371 self.ast_map.as_ref()
374 fn pp_ann<'a>(&'a self) -> &'a pprust::PpAnn { self }
377 impl<'ast> pprust::PpAnn for HygieneAnnotation<'ast> {
379 s: &mut pprust::State,
380 node: pprust::AnnNode) -> io::Result<()> {
382 pprust::NodeIdent(&ast::Ident { name: ast::Name(nm), ctxt }) => {
383 try!(pp::space(&mut s.s));
384 // FIXME #16420: this doesn't display the connections
385 // between syntax contexts
386 s.synth_comment(format!("{}#{}", nm, ctxt))
388 pprust::NodeName(&ast::Name(nm)) => {
389 try!(pp::space(&mut s.s));
390 s.synth_comment(nm.to_string())
398 struct TypedAnnotation<'a, 'tcx: 'a> {
399 tcx: &'a ty::ctxt<'tcx>,
402 impl<'b, 'tcx> HirPrinterSupport<'tcx> for TypedAnnotation<'b, 'tcx> {
403 fn sess<'a>(&'a self) -> &'a Session { &self.tcx.sess }
405 fn ast_map<'a>(&'a self) -> Option<&'a hir_map::Map<'tcx>> {
409 fn pp_ann<'a>(&'a self) -> &'a pprust_hir::PpAnn { self }
412 impl<'a, 'tcx> pprust_hir::PpAnn for TypedAnnotation<'a, 'tcx> {
414 s: &mut pprust_hir::State,
415 node: pprust_hir::AnnNode) -> io::Result<()> {
417 pprust_hir::NodeExpr(_) => s.popen(),
422 s: &mut pprust_hir::State,
423 node: pprust_hir::AnnNode) -> io::Result<()> {
425 pprust_hir::NodeExpr(expr) => {
426 try!(pp::space(&mut s.s));
427 try!(pp::word(&mut s.s, "as"));
428 try!(pp::space(&mut s.s));
429 try!(pp::word(&mut s.s,
430 &self.tcx.expr_ty(expr).to_string()));
438 fn gather_flowgraph_variants(sess: &Session) -> Vec<borrowck_dot::Variant> {
439 let print_loans = sess.opts.debugging_opts.flowgraph_print_loans;
440 let print_moves = sess.opts.debugging_opts.flowgraph_print_moves;
441 let print_assigns = sess.opts.debugging_opts.flowgraph_print_assigns;
442 let print_all = sess.opts.debugging_opts.flowgraph_print_all;
443 let mut variants = Vec::new();
444 if print_all || print_loans {
445 variants.push(borrowck_dot::Loans);
447 if print_all || print_moves {
448 variants.push(borrowck_dot::Moves);
450 if print_all || print_assigns {
451 variants.push(borrowck_dot::Assigns);
456 #[derive(Clone, Debug)]
457 pub enum UserIdentifiedItem {
458 ItemViaNode(ast::NodeId),
459 ItemViaPath(Vec<String>),
462 impl FromStr for UserIdentifiedItem {
464 fn from_str(s: &str) -> Result<UserIdentifiedItem, ()> {
465 Ok(s.parse().map(ItemViaNode).unwrap_or_else(|_| {
466 ItemViaPath(s.split("::").map(|s| s.to_string()).collect())
471 enum NodesMatchingUII<'a, 'ast: 'a> {
472 NodesMatchingDirect(option::IntoIter<ast::NodeId>),
473 NodesMatchingSuffix(hir_map::NodesMatchingSuffix<'a, 'ast>),
476 impl<'a, 'ast> Iterator for NodesMatchingUII<'a, 'ast> {
477 type Item = ast::NodeId;
479 fn next(&mut self) -> Option<ast::NodeId> {
481 &mut NodesMatchingDirect(ref mut iter) => iter.next(),
482 &mut NodesMatchingSuffix(ref mut iter) => iter.next(),
487 impl UserIdentifiedItem {
488 fn reconstructed_input(&self) -> String {
490 ItemViaNode(node_id) => node_id.to_string(),
491 ItemViaPath(ref parts) => parts.join("::"),
495 fn all_matching_node_ids<'a, 'ast>(&'a self, map: &'a hir_map::Map<'ast>)
496 -> NodesMatchingUII<'a, 'ast> {
498 ItemViaNode(node_id) =>
499 NodesMatchingDirect(Some(node_id).into_iter()),
500 ItemViaPath(ref parts) =>
501 NodesMatchingSuffix(map.nodes_matching_suffix(&parts[..])),
505 fn to_one_node_id(self, user_option: &str, sess: &Session, map: &hir_map::Map) -> ast::NodeId {
506 let fail_because = |is_wrong_because| -> ast::NodeId {
508 format!("{} needs NodeId (int) or unique \
509 path suffix (b::c::d); got {}, which {}",
511 self.reconstructed_input(),
513 sess.fatal(&message[..])
516 let mut saw_node = ast::DUMMY_NODE_ID;
518 for node in self.all_matching_node_ids(map) {
522 fail_because("does not resolve uniquely");
526 fail_because("does not resolve to any item");
534 fn needs_ast_map(ppm: &PpMode, opt_uii: &Option<UserIdentifiedItem>) -> bool {
536 PpmSource(PpmNormal) |
537 PpmSource(PpmEveryBodyLoops) |
538 PpmSource(PpmIdentified) => opt_uii.is_some(),
540 PpmSource(PpmExpanded) |
541 PpmSource(PpmExpandedIdentified) |
542 PpmSource(PpmExpandedHygiene) |
544 PpmFlowGraph(_) => true,
545 PpmSource(PpmTyped) => panic!("invalid state"),
549 fn needs_expansion(ppm: &PpMode) -> bool {
551 PpmSource(PpmNormal) |
552 PpmSource(PpmEveryBodyLoops) |
553 PpmSource(PpmIdentified) => false,
555 PpmSource(PpmExpanded) |
556 PpmSource(PpmExpandedIdentified) |
557 PpmSource(PpmExpandedHygiene) |
559 PpmFlowGraph(_) => true,
560 PpmSource(PpmTyped) => panic!("invalid state"),
564 struct ReplaceBodyWithLoop {
565 within_static_or_const: bool,
568 impl ReplaceBodyWithLoop {
569 fn new() -> ReplaceBodyWithLoop {
570 ReplaceBodyWithLoop { within_static_or_const: false }
574 impl fold::Folder for ReplaceBodyWithLoop {
575 fn fold_item_underscore(&mut self, i: ast::Item_) -> ast::Item_ {
577 ast::ItemStatic(..) | ast::ItemConst(..) => {
578 self.within_static_or_const = true;
579 let ret = fold::noop_fold_item_underscore(i, self);
580 self.within_static_or_const = false;
584 fold::noop_fold_item_underscore(i, self)
589 fn fold_trait_item(&mut self, i: P<ast::TraitItem>) -> SmallVector<P<ast::TraitItem>> {
591 ast::ConstTraitItem(..) => {
592 self.within_static_or_const = true;
593 let ret = fold::noop_fold_trait_item(i, self);
594 self.within_static_or_const = false;
597 _ => fold::noop_fold_trait_item(i, self),
601 fn fold_impl_item(&mut self, i: P<ast::ImplItem>) -> SmallVector<P<ast::ImplItem>> {
603 ast::ConstImplItem(..) => {
604 self.within_static_or_const = true;
605 let ret = fold::noop_fold_impl_item(i, self);
606 self.within_static_or_const = false;
609 _ => fold::noop_fold_impl_item(i, self),
613 fn fold_block(&mut self, b: P<ast::Block>) -> P<ast::Block> {
614 fn expr_to_block(rules: ast::BlockCheckMode,
615 e: Option<P<ast::Expr>>) -> P<ast::Block> {
618 stmts: vec![], rules: rules,
619 id: ast::DUMMY_NODE_ID, span: codemap::DUMMY_SP,
623 if !self.within_static_or_const {
625 let empty_block = expr_to_block(ast::DefaultBlock, None);
626 let loop_expr = P(ast::Expr {
627 node: ast::ExprLoop(empty_block, None),
628 id: ast::DUMMY_NODE_ID, span: codemap::DUMMY_SP
631 expr_to_block(b.rules, Some(loop_expr))
634 fold::noop_fold_block(b, self)
638 // in general the pretty printer processes unexpanded code, so
639 // we override the default `fold_mac` method which panics.
640 fn fold_mac(&mut self, mac: ast::Mac) -> ast::Mac {
641 fold::noop_fold_mac(mac, self)
645 pub fn pretty_print_input(sess: Session,
646 cfg: ast::CrateConfig,
649 opt_uii: Option<UserIdentifiedItem>,
650 ofile: Option<PathBuf>) {
651 let krate = driver::phase_1_parse_input(&sess, cfg, input);
653 let krate = if let PpmSource(PpmEveryBodyLoops) = ppm {
654 let mut fold = ReplaceBodyWithLoop::new();
655 fold.fold_crate(krate)
660 let id = link::find_crate_name(Some(&sess), &krate.attrs, input);
662 let is_expanded = needs_expansion(&ppm);
663 let compute_ast_map = needs_ast_map(&ppm, &opt_uii);
664 let krate = if compute_ast_map {
665 match driver::phase_2_configure_and_expand(&sess, krate, &id[..], None) {
667 Some(k) => driver::assign_node_ids(&sess, k)
673 // There is some twisted, god-forsaken tangle of lifetimes here which makes
674 // the ordering of stuff super-finicky.
676 let arenas = ty::CtxtArenas::new();
677 let ast_map = if compute_ast_map {
678 hir_forest = hir_map::Forest::new(lower_crate(&krate));
679 let map = driver::make_map(&sess, &mut hir_forest);
685 let src_name = driver::source_name(input);
686 let src = sess.codemap().get_filemap(&src_name[..])
692 let mut rdr = &src[..];
694 let mut out = Vec::new();
696 match (ppm, opt_uii) {
697 (PpmSource(s), _) => {
698 // Silently ignores an identified node.
699 let out: &mut Write = &mut out;
700 s.call_with_pp_support(
701 sess, ast_map, box out, |annotation, out| {
702 debug!("pretty printing source code {:?}", s);
703 let sess = annotation.sess();
704 pprust::print_crate(sess.codemap(),
707 src_name.to_string(),
715 (PpmHir(s), None) => {
716 let out: &mut Write = &mut out;
717 s.call_with_pp_support_hir(
718 sess, &ast_map.unwrap(), &krate, &arenas, id, box out, |annotation, out, krate| {
719 debug!("pretty printing source code {:?}", s);
720 let sess = annotation.sess();
721 pprust_hir::print_crate(sess.codemap(),
724 src_name.to_string(),
732 (PpmHir(s), Some(uii)) => {
733 let out: &mut Write = &mut out;
734 s.call_with_pp_support_hir(sess,
740 |annotation, (out,uii), _| {
741 debug!("pretty printing source code {:?}", s);
742 let sess = annotation.sess();
743 let ast_map = annotation.ast_map().expect("--pretty missing ast_map");
745 pprust_hir::State::new_from_input(sess.codemap(),
747 src_name.to_string(),
752 for node_id in uii.all_matching_node_ids(ast_map) {
753 let node = ast_map.get(node_id);
754 try!(pp_state.print_node(&node));
755 try!(pp::space(&mut pp_state.s));
756 try!(pp_state.synth_comment(ast_map.path_to_string(node_id)));
757 try!(pp::hardbreak(&mut pp_state.s));
759 pp::eof(&mut pp_state.s)
763 (PpmFlowGraph(mode), opt_uii) => {
764 debug!("pretty printing flow graph for {:?}", opt_uii);
765 let uii = opt_uii.unwrap_or_else(|| {
766 sess.fatal(&format!("`pretty flowgraph=..` needs NodeId (int) or
767 unique path suffix (b::c::d)"))
770 let ast_map = ast_map.expect("--pretty flowgraph missing ast_map");
771 let nodeid = uii.to_one_node_id("--pretty", &sess, &ast_map);
773 let node = ast_map.find(nodeid).unwrap_or_else(|| {
774 sess.fatal(&format!("--pretty flowgraph couldn't find id: {}",
778 let code = blocks::Code::from_node(node);
779 let out: &mut Write = &mut out;
782 let variants = gather_flowgraph_variants(&sess);
783 driver::phase_3_run_analysis_passes(sess,
788 resolve::MakeGlobMap::No,
790 print_flowgraph(variants, tcx, code, mode, out)
794 let message = format!("--pretty=flowgraph needs \
795 block, fn, or method; got {:?}",
798 // point to what was found, if there's an
800 match ast_map.opt_span(nodeid) {
801 Some(sp) => sess.span_fatal(sp, &message[..]),
802 None => sess.fatal(&message[..])
810 None => print!("{}", String::from_utf8(out).unwrap()),
812 match File::create(&p) {
813 Ok(mut w) => w.write_all(&out).unwrap(),
814 Err(e) => panic!("print-print failed to open {} due to {}",
821 fn print_flowgraph<W: Write>(variants: Vec<borrowck_dot::Variant>,
824 mode: PpFlowGraphMode,
825 mut out: W) -> io::Result<()> {
826 let cfg = match code {
827 blocks::BlockCode(block) => cfg::CFG::new(tcx, &*block),
828 blocks::FnLikeCode(fn_like) => cfg::CFG::new(tcx, &*fn_like.body()),
830 let labelled_edges = mode != PpFlowGraphMode::UnlabelledEdges;
831 let lcfg = LabelledCFG {
834 name: format!("node_{}", code.id()),
835 labelled_edges: labelled_edges,
839 _ if variants.is_empty() => {
840 let r = dot::render(&lcfg, &mut out);
841 return expand_err_details(r);
843 blocks::BlockCode(_) => {
844 tcx.sess.err("--pretty flowgraph with -Z flowgraph-print \
845 annotations requires fn-like node id.");
848 blocks::FnLikeCode(fn_like) => {
849 let fn_parts = borrowck::FnPartsWithCFG::from_fn_like(&fn_like, &cfg);
850 let (bccx, analysis_data) =
851 borrowck::build_borrowck_dataflow_data_for_fn(tcx, fn_parts);
853 let lcfg = borrowck_dot::DataflowLabeller {
856 borrowck_ctxt: &bccx,
857 analysis_data: &analysis_data,
859 let r = dot::render(&lcfg, &mut out);
860 return expand_err_details(r);
864 fn expand_err_details(r: io::Result<()>) -> io::Result<()> {
866 io::Error::new(io::ErrorKind::Other,
867 &format!("graphviz::render failed: {}", ioerr)[..])