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, LoweringContext};
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(PpmIdentified),
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 arenas: &'tcx ty::CtxtArenas<'tcx>,
164 F: FnOnce(&HirPrinterSupport, B, &hir::Crate) -> A,
168 let annotation = NoAnn { sess: sess, ast_map: Some(ast_map.clone()) };
169 f(&annotation, payload, &ast_map.forest.krate)
173 let annotation = IdentifiedAnnotation {
175 ast_map: Some(ast_map.clone())
177 f(&annotation, payload, &ast_map.forest.krate)
180 driver::phase_3_run_analysis_passes(sess,
184 resolve::MakeGlobMap::No,
186 let annotation = TypedAnnotation { tcx: tcx };
187 f(&annotation, payload, &ast_map.forest.krate)
190 _ => panic!("Should use call_with_pp_support"),
195 trait PrinterSupport<'ast>: pprust::PpAnn {
196 /// Provides a uniform interface for re-extracting a reference to a
197 /// `Session` from a value that now owns it.
198 fn sess<'a>(&'a self) -> &'a Session;
200 /// Provides a uniform interface for re-extracting a reference to an
201 /// `hir_map::Map` from a value that now owns it.
202 fn ast_map<'a>(&'a self) -> Option<&'a hir_map::Map<'ast>>;
204 /// Produces the pretty-print annotation object.
206 /// (Rust does not yet support upcasting from a trait object to
207 /// an object for one of its super-traits.)
208 fn pp_ann<'a>(&'a self) -> &'a pprust::PpAnn;
211 trait HirPrinterSupport<'ast>: pprust_hir::PpAnn {
212 /// Provides a uniform interface for re-extracting a reference to a
213 /// `Session` from a value that now owns it.
214 fn sess<'a>(&'a self) -> &'a Session;
216 /// Provides a uniform interface for re-extracting a reference to an
217 /// `hir_map::Map` from a value that now owns it.
218 fn ast_map<'a>(&'a self) -> Option<&'a hir_map::Map<'ast>>;
220 /// Produces the pretty-print annotation object.
222 /// (Rust does not yet support upcasting from a trait object to
223 /// an object for one of its super-traits.)
224 fn pp_ann<'a>(&'a self) -> &'a pprust_hir::PpAnn;
229 ast_map: Option<hir_map::Map<'ast>>
232 impl<'ast> PrinterSupport<'ast> for NoAnn<'ast> {
233 fn sess<'a>(&'a self) -> &'a Session { self.sess }
235 fn ast_map<'a>(&'a self) -> Option<&'a hir_map::Map<'ast>> {
236 self.ast_map.as_ref()
239 fn pp_ann<'a>(&'a self) -> &'a pprust::PpAnn { self }
242 impl<'ast> HirPrinterSupport<'ast> for NoAnn<'ast> {
243 fn sess<'a>(&'a self) -> &'a Session { self.sess }
245 fn ast_map<'a>(&'a self) -> Option<&'a hir_map::Map<'ast>> {
246 self.ast_map.as_ref()
249 fn pp_ann<'a>(&'a self) -> &'a pprust_hir::PpAnn { self }
252 impl<'ast> pprust::PpAnn for NoAnn<'ast> {}
253 impl<'ast> pprust_hir::PpAnn for NoAnn<'ast> {}
255 struct IdentifiedAnnotation<'ast> {
257 ast_map: Option<hir_map::Map<'ast>>,
260 impl<'ast> PrinterSupport<'ast> for IdentifiedAnnotation<'ast> {
261 fn sess<'a>(&'a self) -> &'a Session { self.sess }
263 fn ast_map<'a>(&'a self) -> Option<&'a hir_map::Map<'ast>> {
264 self.ast_map.as_ref()
267 fn pp_ann<'a>(&'a self) -> &'a pprust::PpAnn { self }
270 impl<'ast> pprust::PpAnn for IdentifiedAnnotation<'ast> {
272 s: &mut pprust::State,
273 node: pprust::AnnNode) -> io::Result<()> {
275 pprust::NodeExpr(_) => s.popen(),
280 s: &mut pprust::State,
281 node: pprust::AnnNode) -> io::Result<()> {
283 pprust::NodeIdent(_) | pprust::NodeName(_) => Ok(()),
285 pprust::NodeItem(item) => {
286 try!(pp::space(&mut s.s));
287 s.synth_comment(item.id.to_string())
289 pprust::NodeSubItem(id) => {
290 try!(pp::space(&mut s.s));
291 s.synth_comment(id.to_string())
293 pprust::NodeBlock(blk) => {
294 try!(pp::space(&mut s.s));
295 s.synth_comment(format!("block {}", blk.id))
297 pprust::NodeExpr(expr) => {
298 try!(pp::space(&mut s.s));
299 try!(s.synth_comment(expr.id.to_string()));
302 pprust::NodePat(pat) => {
303 try!(pp::space(&mut s.s));
304 s.synth_comment(format!("pat {}", pat.id))
310 impl<'ast> HirPrinterSupport<'ast> for IdentifiedAnnotation<'ast> {
311 fn sess<'a>(&'a self) -> &'a Session { self.sess }
313 fn ast_map<'a>(&'a self) -> Option<&'a hir_map::Map<'ast>> {
314 self.ast_map.as_ref()
317 fn pp_ann<'a>(&'a self) -> &'a pprust_hir::PpAnn { self }
320 impl<'ast> pprust_hir::PpAnn for IdentifiedAnnotation<'ast> {
322 s: &mut pprust_hir::State,
323 node: pprust_hir::AnnNode) -> io::Result<()> {
325 pprust_hir::NodeExpr(_) => s.popen(),
330 s: &mut pprust_hir::State,
331 node: pprust_hir::AnnNode) -> io::Result<()> {
333 pprust_hir::NodeName(_) => Ok(()),
334 pprust_hir::NodeItem(item) => {
335 try!(pp::space(&mut s.s));
336 s.synth_comment(item.id.to_string())
338 pprust_hir::NodeSubItem(id) => {
339 try!(pp::space(&mut s.s));
340 s.synth_comment(id.to_string())
342 pprust_hir::NodeBlock(blk) => {
343 try!(pp::space(&mut s.s));
344 s.synth_comment(format!("block {}", blk.id))
346 pprust_hir::NodeExpr(expr) => {
347 try!(pp::space(&mut s.s));
348 try!(s.synth_comment(expr.id.to_string()));
351 pprust_hir::NodePat(pat) => {
352 try!(pp::space(&mut s.s));
353 s.synth_comment(format!("pat {}", pat.id))
359 struct HygieneAnnotation<'ast> {
361 ast_map: Option<hir_map::Map<'ast>>,
364 impl<'ast> PrinterSupport<'ast> for HygieneAnnotation<'ast> {
365 fn sess<'a>(&'a self) -> &'a Session { self.sess }
367 fn ast_map<'a>(&'a self) -> Option<&'a hir_map::Map<'ast>> {
368 self.ast_map.as_ref()
371 fn pp_ann<'a>(&'a self) -> &'a pprust::PpAnn { self }
374 impl<'ast> pprust::PpAnn for HygieneAnnotation<'ast> {
376 s: &mut pprust::State,
377 node: pprust::AnnNode) -> io::Result<()> {
379 pprust::NodeIdent(&ast::Ident { name: ast::Name(nm), ctxt }) => {
380 try!(pp::space(&mut s.s));
381 // FIXME #16420: this doesn't display the connections
382 // between syntax contexts
383 s.synth_comment(format!("{}#{}", nm, ctxt.0))
385 pprust::NodeName(&ast::Name(nm)) => {
386 try!(pp::space(&mut s.s));
387 s.synth_comment(nm.to_string())
395 struct TypedAnnotation<'a, 'tcx: 'a> {
396 tcx: &'a ty::ctxt<'tcx>,
399 impl<'b, 'tcx> HirPrinterSupport<'tcx> for TypedAnnotation<'b, 'tcx> {
400 fn sess<'a>(&'a self) -> &'a Session { &self.tcx.sess }
402 fn ast_map<'a>(&'a self) -> Option<&'a hir_map::Map<'tcx>> {
406 fn pp_ann<'a>(&'a self) -> &'a pprust_hir::PpAnn { self }
409 impl<'a, 'tcx> pprust_hir::PpAnn for TypedAnnotation<'a, 'tcx> {
411 s: &mut pprust_hir::State,
412 node: pprust_hir::AnnNode) -> io::Result<()> {
414 pprust_hir::NodeExpr(_) => s.popen(),
419 s: &mut pprust_hir::State,
420 node: pprust_hir::AnnNode) -> io::Result<()> {
422 pprust_hir::NodeExpr(expr) => {
423 try!(pp::space(&mut s.s));
424 try!(pp::word(&mut s.s, "as"));
425 try!(pp::space(&mut s.s));
426 try!(pp::word(&mut s.s,
427 &self.tcx.expr_ty(expr).to_string()));
435 fn gather_flowgraph_variants(sess: &Session) -> Vec<borrowck_dot::Variant> {
436 let print_loans = sess.opts.debugging_opts.flowgraph_print_loans;
437 let print_moves = sess.opts.debugging_opts.flowgraph_print_moves;
438 let print_assigns = sess.opts.debugging_opts.flowgraph_print_assigns;
439 let print_all = sess.opts.debugging_opts.flowgraph_print_all;
440 let mut variants = Vec::new();
441 if print_all || print_loans {
442 variants.push(borrowck_dot::Loans);
444 if print_all || print_moves {
445 variants.push(borrowck_dot::Moves);
447 if print_all || print_assigns {
448 variants.push(borrowck_dot::Assigns);
453 #[derive(Clone, Debug)]
454 pub enum UserIdentifiedItem {
455 ItemViaNode(ast::NodeId),
456 ItemViaPath(Vec<String>),
459 impl FromStr for UserIdentifiedItem {
461 fn from_str(s: &str) -> Result<UserIdentifiedItem, ()> {
462 Ok(s.parse().map(ItemViaNode).unwrap_or_else(|_| {
463 ItemViaPath(s.split("::").map(|s| s.to_string()).collect())
468 enum NodesMatchingUII<'a, 'ast: 'a> {
469 NodesMatchingDirect(option::IntoIter<ast::NodeId>),
470 NodesMatchingSuffix(hir_map::NodesMatchingSuffix<'a, 'ast>),
473 impl<'a, 'ast> Iterator for NodesMatchingUII<'a, 'ast> {
474 type Item = ast::NodeId;
476 fn next(&mut self) -> Option<ast::NodeId> {
478 &mut NodesMatchingDirect(ref mut iter) => iter.next(),
479 &mut NodesMatchingSuffix(ref mut iter) => iter.next(),
484 impl UserIdentifiedItem {
485 fn reconstructed_input(&self) -> String {
487 ItemViaNode(node_id) => node_id.to_string(),
488 ItemViaPath(ref parts) => parts.join("::"),
492 fn all_matching_node_ids<'a, 'ast>(&'a self, map: &'a hir_map::Map<'ast>)
493 -> NodesMatchingUII<'a, 'ast> {
495 ItemViaNode(node_id) =>
496 NodesMatchingDirect(Some(node_id).into_iter()),
497 ItemViaPath(ref parts) =>
498 NodesMatchingSuffix(map.nodes_matching_suffix(&parts[..])),
502 fn to_one_node_id(self, user_option: &str, sess: &Session, map: &hir_map::Map) -> ast::NodeId {
503 let fail_because = |is_wrong_because| -> ast::NodeId {
505 format!("{} needs NodeId (int) or unique \
506 path suffix (b::c::d); got {}, which {}",
508 self.reconstructed_input(),
510 sess.fatal(&message[..])
513 let mut saw_node = ast::DUMMY_NODE_ID;
515 for node in self.all_matching_node_ids(map) {
519 fail_because("does not resolve uniquely");
523 fail_because("does not resolve to any item");
531 fn needs_ast_map(ppm: &PpMode, opt_uii: &Option<UserIdentifiedItem>) -> bool {
533 PpmSource(PpmNormal) |
534 PpmSource(PpmEveryBodyLoops) |
535 PpmSource(PpmIdentified) => opt_uii.is_some(),
537 PpmSource(PpmExpanded) |
538 PpmSource(PpmExpandedIdentified) |
539 PpmSource(PpmExpandedHygiene) |
541 PpmFlowGraph(_) => true,
542 PpmSource(PpmTyped) => panic!("invalid state"),
546 fn needs_expansion(ppm: &PpMode) -> bool {
548 PpmSource(PpmNormal) |
549 PpmSource(PpmEveryBodyLoops) |
550 PpmSource(PpmIdentified) => false,
552 PpmSource(PpmExpanded) |
553 PpmSource(PpmExpandedIdentified) |
554 PpmSource(PpmExpandedHygiene) |
556 PpmFlowGraph(_) => true,
557 PpmSource(PpmTyped) => panic!("invalid state"),
561 struct ReplaceBodyWithLoop {
562 within_static_or_const: bool,
565 impl ReplaceBodyWithLoop {
566 fn new() -> ReplaceBodyWithLoop {
567 ReplaceBodyWithLoop { within_static_or_const: false }
571 impl fold::Folder for ReplaceBodyWithLoop {
572 fn fold_item_underscore(&mut self, i: ast::Item_) -> ast::Item_ {
574 ast::ItemStatic(..) | ast::ItemConst(..) => {
575 self.within_static_or_const = true;
576 let ret = fold::noop_fold_item_underscore(i, self);
577 self.within_static_or_const = false;
581 fold::noop_fold_item_underscore(i, self)
586 fn fold_trait_item(&mut self, i: P<ast::TraitItem>) -> SmallVector<P<ast::TraitItem>> {
588 ast::ConstTraitItem(..) => {
589 self.within_static_or_const = true;
590 let ret = fold::noop_fold_trait_item(i, self);
591 self.within_static_or_const = false;
594 _ => fold::noop_fold_trait_item(i, self),
598 fn fold_impl_item(&mut self, i: P<ast::ImplItem>) -> SmallVector<P<ast::ImplItem>> {
600 ast::ConstImplItem(..) => {
601 self.within_static_or_const = true;
602 let ret = fold::noop_fold_impl_item(i, self);
603 self.within_static_or_const = false;
606 _ => fold::noop_fold_impl_item(i, self),
610 fn fold_block(&mut self, b: P<ast::Block>) -> P<ast::Block> {
611 fn expr_to_block(rules: ast::BlockCheckMode,
612 e: Option<P<ast::Expr>>) -> P<ast::Block> {
615 stmts: vec![], rules: rules,
616 id: ast::DUMMY_NODE_ID, span: codemap::DUMMY_SP,
620 if !self.within_static_or_const {
622 let empty_block = expr_to_block(ast::DefaultBlock, None);
623 let loop_expr = P(ast::Expr {
624 node: ast::ExprLoop(empty_block, None),
625 id: ast::DUMMY_NODE_ID, span: codemap::DUMMY_SP
628 expr_to_block(b.rules, Some(loop_expr))
631 fold::noop_fold_block(b, self)
635 // in general the pretty printer processes unexpanded code, so
636 // we override the default `fold_mac` method which panics.
637 fn fold_mac(&mut self, mac: ast::Mac) -> ast::Mac {
638 fold::noop_fold_mac(mac, self)
642 pub fn pretty_print_input(sess: Session,
643 cfg: ast::CrateConfig,
646 opt_uii: Option<UserIdentifiedItem>,
647 ofile: Option<PathBuf>) {
648 let krate = driver::phase_1_parse_input(&sess, cfg, input);
650 let krate = if let PpmSource(PpmEveryBodyLoops) = ppm {
651 let mut fold = ReplaceBodyWithLoop::new();
652 fold.fold_crate(krate)
657 let id = link::find_crate_name(Some(&sess), &krate.attrs, input);
659 let is_expanded = needs_expansion(&ppm);
660 let compute_ast_map = needs_ast_map(&ppm, &opt_uii);
661 let krate = if compute_ast_map {
662 match driver::phase_2_configure_and_expand(&sess, krate, &id[..], None) {
664 Some(k) => driver::assign_node_ids(&sess, k)
670 // There is some twisted, god-forsaken tangle of lifetimes here which makes
671 // the ordering of stuff super-finicky.
673 let lcx = LoweringContext::new(&sess, Some(&krate));
674 let arenas = ty::CtxtArenas::new();
675 let ast_map = if compute_ast_map {
676 hir_forest = hir_map::Forest::new(lower_crate(&lcx, &krate));
677 let map = driver::make_map(&sess, &mut hir_forest);
683 let src_name = driver::source_name(input);
684 let src = sess.codemap().get_filemap(&src_name[..])
690 let mut rdr = &src[..];
692 let mut out = Vec::new();
694 match (ppm, opt_uii) {
695 (PpmSource(s), _) => {
696 // Silently ignores an identified node.
697 let out: &mut Write = &mut out;
698 s.call_with_pp_support(
699 &sess, ast_map, box out, |annotation, out| {
700 debug!("pretty printing source code {:?}", s);
701 let sess = annotation.sess();
702 pprust::print_crate(sess.codemap(),
705 src_name.to_string(),
713 (PpmHir(s), None) => {
714 let out: &mut Write = &mut out;
715 s.call_with_pp_support_hir(
716 &sess, &ast_map.unwrap(), &arenas, &id, box out, |annotation, out, krate| {
717 debug!("pretty printing source code {:?}", s);
718 let sess = annotation.sess();
719 pprust_hir::print_crate(sess.codemap(),
722 src_name.to_string(),
730 (PpmHir(s), Some(uii)) => {
731 let out: &mut Write = &mut out;
732 s.call_with_pp_support_hir(&sess,
737 |annotation, (out,uii), _| {
738 debug!("pretty printing source code {:?}", s);
739 let sess = annotation.sess();
740 let ast_map = annotation.ast_map().expect("--pretty missing ast_map");
742 pprust_hir::State::new_from_input(sess.codemap(),
744 src_name.to_string(),
749 for node_id in uii.all_matching_node_ids(ast_map) {
750 let node = ast_map.get(node_id);
751 try!(pp_state.print_node(&node));
752 try!(pp::space(&mut pp_state.s));
753 try!(pp_state.synth_comment(ast_map.path_to_string(node_id)));
754 try!(pp::hardbreak(&mut pp_state.s));
756 pp::eof(&mut pp_state.s)
760 (PpmFlowGraph(mode), opt_uii) => {
761 debug!("pretty printing flow graph for {:?}", opt_uii);
762 let uii = opt_uii.unwrap_or_else(|| {
763 sess.fatal(&format!("`pretty flowgraph=..` needs NodeId (int) or
764 unique path suffix (b::c::d)"))
767 let ast_map = ast_map.expect("--pretty flowgraph missing ast_map");
768 let nodeid = uii.to_one_node_id("--pretty", &sess, &ast_map);
770 let node = ast_map.find(nodeid).unwrap_or_else(|| {
771 sess.fatal(&format!("--pretty flowgraph couldn't find id: {}",
775 let code = blocks::Code::from_node(node);
776 let out: &mut Write = &mut out;
779 let variants = gather_flowgraph_variants(&sess);
780 driver::phase_3_run_analysis_passes(&sess,
784 resolve::MakeGlobMap::No,
786 print_flowgraph(variants, tcx, code, mode, out)
790 let message = format!("--pretty=flowgraph needs \
791 block, fn, or method; got {:?}",
794 // point to what was found, if there's an
796 match ast_map.opt_span(nodeid) {
797 Some(sp) => sess.span_fatal(sp, &message[..]),
798 None => sess.fatal(&message[..])
806 None => print!("{}", String::from_utf8(out).unwrap()),
808 match File::create(&p) {
809 Ok(mut w) => w.write_all(&out).unwrap(),
810 Err(e) => panic!("print-print failed to open {} due to {}",
817 fn print_flowgraph<W: Write>(variants: Vec<borrowck_dot::Variant>,
820 mode: PpFlowGraphMode,
821 mut out: W) -> io::Result<()> {
822 let cfg = match code {
823 blocks::BlockCode(block) => cfg::CFG::new(tcx, &*block),
824 blocks::FnLikeCode(fn_like) => cfg::CFG::new(tcx, &*fn_like.body()),
826 let labelled_edges = mode != PpFlowGraphMode::UnlabelledEdges;
827 let lcfg = LabelledCFG {
830 name: format!("node_{}", code.id()),
831 labelled_edges: labelled_edges,
835 _ if variants.is_empty() => {
836 let r = dot::render(&lcfg, &mut out);
837 return expand_err_details(r);
839 blocks::BlockCode(_) => {
840 tcx.sess.err("--pretty flowgraph with -Z flowgraph-print \
841 annotations requires fn-like node id.");
844 blocks::FnLikeCode(fn_like) => {
845 let fn_parts = borrowck::FnPartsWithCFG::from_fn_like(&fn_like, &cfg);
846 let (bccx, analysis_data) =
847 borrowck::build_borrowck_dataflow_data_for_fn(tcx, fn_parts);
849 let lcfg = borrowck_dot::DataflowLabeller {
852 borrowck_ctxt: &bccx,
853 analysis_data: &analysis_data,
855 let r = dot::render(&lcfg, &mut out);
856 return expand_err_details(r);
860 fn expand_err_details(r: io::Result<()>) -> io::Result<()> {
862 io::Error::new(io::ErrorKind::Other,
863 &format!("graphviz::render failed: {}", ioerr)[..])