1 use std::collections::BTreeSet;
3 use std::fmt::Write as _;
5 use std::io::{self, Write};
6 use std::path::{Path, PathBuf};
8 use super::graphviz::write_mir_fn_graphviz;
9 use super::spanview::write_mir_fn_spanview;
11 use rustc_data_structures::fx::FxHashMap;
12 use rustc_hir::def_id::DefId;
13 use rustc_index::vec::Idx;
14 use rustc_middle::mir::interpret::{
15 read_target_uint, AllocId, Allocation, ConstValue, GlobalAlloc, Pointer, Provenance,
17 use rustc_middle::mir::visit::Visitor;
18 use rustc_middle::mir::MirSource;
19 use rustc_middle::mir::*;
20 use rustc_middle::ty::{self, TyCtxt, TyS, TypeFoldable, TypeVisitor};
21 use rustc_target::abi::Size;
22 use std::ops::ControlFlow;
24 const INDENT: &str = " ";
25 /// Alignment for lining up comments following MIR statements
26 pub(crate) const ALIGN: usize = 40;
28 /// An indication of where we are in the control flow graph. Used for printing
29 /// extra information in `dump_mir`
31 /// We have not started dumping the control flow graph, but we are about to.
34 /// We just finished dumping the control flow graph. This is right before EOF
37 /// We are about to start dumping the given basic block.
38 BeforeBlock(BasicBlock),
40 /// We are just about to dump the given statement or terminator.
41 BeforeLocation(Location),
43 /// We just dumped the given statement or terminator.
44 AfterLocation(Location),
46 /// We just dumped the terminator for a block but not the closing `}`.
47 AfterTerminator(BasicBlock),
50 /// If the session is properly configured, dumps a human-readable
51 /// representation of the mir into:
54 /// rustc.node<node_id>.<pass_num>.<pass_name>.<disambiguator>
57 /// Output from this function is controlled by passing `-Z dump-mir=<filter>`,
58 /// where `<filter>` takes the following forms:
60 /// - `all` -- dump MIR for all fns, all passes, all everything
61 /// - a filter defined by a set of substrings combined with `&` and `|`
62 /// (`&` has higher precedence). At least one of the `|`-separated groups
63 /// must match; an `|`-separated group matches if all of its `&`-separated
64 /// substrings are matched.
68 /// - `nll` == match if `nll` appears in the name
69 /// - `foo & nll` == match if `foo` and `nll` both appear in the name
70 /// - `foo & nll | typeck` == match if `foo` and `nll` both appear in the name
71 /// or `typeck` appears in the name.
72 /// - `foo & nll | bar & typeck` == match if `foo` and `nll` both appear in the name
73 /// or `typeck` and `bar` both appear in the name.
74 pub fn dump_mir<'tcx, F>(
76 pass_num: Option<&dyn Display>,
78 disambiguator: &dyn Display,
82 F: FnMut(PassWhere, &mut dyn Write) -> io::Result<()>,
84 if !dump_enabled(tcx, pass_name, body.source.def_id()) {
88 dump_matched_mir_node(tcx, pass_num, pass_name, disambiguator, body, extra_data);
91 pub fn dump_enabled<'tcx>(tcx: TyCtxt<'tcx>, pass_name: &str, def_id: DefId) -> bool {
92 let filters = match tcx.sess.opts.debugging_opts.dump_mir {
94 Some(ref filters) => filters,
96 let node_path = ty::print::with_forced_impl_filename_line(|| {
97 // see notes on #41697 below
98 tcx.def_path_str(def_id)
100 filters.split('|').any(|or_filter| {
101 or_filter.split('&').all(|and_filter| {
102 let and_filter_trimmed = and_filter.trim();
103 and_filter_trimmed == "all"
104 || pass_name.contains(and_filter_trimmed)
105 || node_path.contains(and_filter_trimmed)
110 // #41697 -- we use `with_forced_impl_filename_line()` because
111 // `def_path_str()` would otherwise trigger `type_of`, and this can
112 // run while we are already attempting to evaluate `type_of`.
114 fn dump_matched_mir_node<'tcx, F>(
116 pass_num: Option<&dyn Display>,
118 disambiguator: &dyn Display,
122 F: FnMut(PassWhere, &mut dyn Write) -> io::Result<()>,
124 let _: io::Result<()> = try {
126 create_dump_file(tcx, "mir", pass_num, pass_name, disambiguator, body.source)?;
127 let def_path = ty::print::with_forced_impl_filename_line(|| {
128 // see notes on #41697 above
129 tcx.def_path_str(body.source.def_id())
131 write!(file, "// MIR for `{}", def_path)?;
132 match body.source.promoted {
133 None => write!(file, "`")?,
134 Some(promoted) => write!(file, "::{:?}`", promoted)?,
136 writeln!(file, " {} {}", disambiguator, pass_name)?;
137 if let Some(ref layout) = body.generator_layout() {
138 writeln!(file, "/* generator_layout = {:#?} */", layout)?;
141 extra_data(PassWhere::BeforeCFG, &mut file)?;
142 write_user_type_annotations(tcx, body, &mut file)?;
143 write_mir_fn(tcx, body, &mut extra_data, &mut file)?;
144 extra_data(PassWhere::AfterCFG, &mut file)?;
147 if tcx.sess.opts.debugging_opts.dump_mir_graphviz {
148 let _: io::Result<()> = try {
150 create_dump_file(tcx, "dot", pass_num, pass_name, disambiguator, body.source)?;
151 write_mir_fn_graphviz(tcx, body, false, &mut file)?;
155 if let Some(spanview) = tcx.sess.opts.debugging_opts.dump_mir_spanview {
156 let _: io::Result<()> = try {
158 dump_file_basename(tcx, pass_num, pass_name, disambiguator, body.source);
159 let mut file = create_dump_file_with_basename(tcx, &file_basename, "html")?;
160 if body.source.def_id().is_local() {
161 write_mir_fn_spanview(tcx, body, spanview, &file_basename, &mut file)?;
167 /// Returns the file basename portion (without extension) of a filename path
168 /// where we should dump a MIR representation output files.
169 fn dump_file_basename(
171 pass_num: Option<&dyn Display>,
173 disambiguator: &dyn Display,
174 source: MirSource<'tcx>,
176 let promotion_id = match source.promoted {
177 Some(id) => format!("-{:?}", id),
178 None => String::new(),
181 let pass_num = if tcx.sess.opts.debugging_opts.dump_mir_exclude_pass_number {
185 None => ".-------".to_string(),
186 Some(pass_num) => format!(".{}", pass_num),
190 let crate_name = tcx.crate_name(source.def_id().krate);
191 let item_name = tcx.def_path(source.def_id()).to_filename_friendly_no_crate();
192 // All drop shims have the same DefId, so we have to add the type
193 // to get unique file names.
194 let shim_disambiguator = match source.instance {
195 ty::InstanceDef::DropGlue(_, Some(ty)) => {
196 // Unfortunately, pretty-printed typed are not very filename-friendly.
197 // We dome some filtering.
198 let mut s = ".".to_owned();
199 s.extend(ty.to_string().chars().filter_map(|c| match c {
201 ':' | '<' | '>' => Some('_'),
211 crate_name, item_name, shim_disambiguator, promotion_id, pass_num, pass_name, disambiguator,
215 /// Returns the path to the filename where we should dump a given MIR.
216 /// Also used by other bits of code (e.g., NLL inference) that dump
217 /// graphviz data or other things.
218 fn dump_path(tcx: TyCtxt<'_>, basename: &str, extension: &str) -> PathBuf {
219 let mut file_path = PathBuf::new();
220 file_path.push(Path::new(&tcx.sess.opts.debugging_opts.dump_mir_dir));
222 let file_name = format!("{}.{}", basename, extension,);
224 file_path.push(&file_name);
229 /// Attempts to open the MIR dump file with the given name and extension.
230 fn create_dump_file_with_basename(
234 ) -> io::Result<io::BufWriter<fs::File>> {
235 let file_path = dump_path(tcx, file_basename, extension);
236 if let Some(parent) = file_path.parent() {
237 fs::create_dir_all(parent).map_err(|e| {
240 format!("IO error creating MIR dump directory: {:?}; {}", parent, e),
244 Ok(io::BufWriter::new(fs::File::create(&file_path).map_err(|e| {
245 io::Error::new(e.kind(), format!("IO error creating MIR dump file: {:?}; {}", file_path, e))
249 /// Attempts to open a file where we should dump a given MIR or other
250 /// bit of MIR-related data. Used by `mir-dump`, but also by other
251 /// bits of code (e.g., NLL inference) that dump graphviz data or
252 /// other things, and hence takes the extension as an argument.
253 pub fn create_dump_file(
256 pass_num: Option<&dyn Display>,
258 disambiguator: &dyn Display,
259 source: MirSource<'tcx>,
260 ) -> io::Result<io::BufWriter<fs::File>> {
261 create_dump_file_with_basename(
263 &dump_file_basename(tcx, pass_num, pass_name, disambiguator, source),
268 /// Write out a human-readable textual representation for the given MIR.
269 pub fn write_mir_pretty<'tcx>(
271 single: Option<DefId>,
273 ) -> io::Result<()> {
274 writeln!(w, "// WARNING: This output format is intended for human consumers only")?;
275 writeln!(w, "// and is subject to change without notice. Knock yourself out.")?;
277 let mut first = true;
278 for def_id in dump_mir_def_ids(tcx, single) {
282 // Put empty lines between all items
286 let render_body = |w: &mut dyn Write, body| -> io::Result<()> {
287 write_mir_fn(tcx, body, &mut |_, _| Ok(()), w)?;
289 for body in tcx.promoted_mir(def_id) {
291 write_mir_fn(tcx, body, &mut |_, _| Ok(()), w)?;
296 // For `const fn` we want to render both the optimized MIR and the MIR for ctfe.
297 if tcx.is_const_fn_raw(def_id) {
298 render_body(w, tcx.optimized_mir(def_id))?;
300 writeln!(w, "// MIR FOR CTFE")?;
301 // Do not use `render_body`, as that would render the promoteds again, but these
302 // are shared between mir_for_ctfe and optimized_mir
303 write_mir_fn(tcx, tcx.mir_for_ctfe(def_id), &mut |_, _| Ok(()), w)?;
306 tcx.instance_mir(ty::InstanceDef::Item(ty::WithOptConstParam::unknown(def_id)));
307 render_body(w, instance_mir)?;
313 /// Write out a human-readable textual representation for the given function.
314 pub fn write_mir_fn<'tcx, F>(
321 F: FnMut(PassWhere, &mut dyn Write) -> io::Result<()>,
323 write_mir_intro(tcx, body, w)?;
324 for block in body.basic_blocks().indices() {
325 extra_data(PassWhere::BeforeBlock(block), w)?;
326 write_basic_block(tcx, block, body, extra_data, w)?;
327 if block.index() + 1 != body.basic_blocks().len() {
334 write_allocations(tcx, body, w)?;
339 /// Write out a human-readable textual representation for the given basic block.
340 pub fn write_basic_block<'tcx, F>(
348 F: FnMut(PassWhere, &mut dyn Write) -> io::Result<()>,
350 let data = &body[block];
352 // Basic block label at the top.
353 let cleanup_text = if data.is_cleanup { " (cleanup)" } else { "" };
354 writeln!(w, "{}{:?}{}: {{", INDENT, block, cleanup_text)?;
356 // List of statements in the middle.
357 let mut current_location = Location { block, statement_index: 0 };
358 for statement in &data.statements {
359 extra_data(PassWhere::BeforeLocation(current_location), w)?;
360 let indented_body = format!("{0}{0}{1:?};", INDENT, statement);
365 if tcx.sess.verbose() { format!("{:?}: ", current_location) } else { String::new() },
366 comment(tcx, statement.source_info),
370 write_extra(tcx, w, |visitor| {
371 visitor.visit_statement(statement, current_location);
374 extra_data(PassWhere::AfterLocation(current_location), w)?;
376 current_location.statement_index += 1;
379 // Terminator at the bottom.
380 extra_data(PassWhere::BeforeLocation(current_location), w)?;
381 let indented_terminator = format!("{0}{0}{1:?};", INDENT, data.terminator().kind);
386 if tcx.sess.verbose() { format!("{:?}: ", current_location) } else { String::new() },
387 comment(tcx, data.terminator().source_info),
391 write_extra(tcx, w, |visitor| {
392 visitor.visit_terminator(data.terminator(), current_location);
395 extra_data(PassWhere::AfterLocation(current_location), w)?;
396 extra_data(PassWhere::AfterTerminator(block), w)?;
398 writeln!(w, "{}}}", INDENT)
401 /// After we print the main statement, we sometimes dump extra
402 /// information. There's often a lot of little things "nuzzled up" in
404 fn write_extra<'tcx, F>(tcx: TyCtxt<'tcx>, write: &mut dyn Write, mut visit_op: F) -> io::Result<()>
406 F: FnMut(&mut ExtraComments<'tcx>),
408 let mut extra_comments = ExtraComments { tcx, comments: vec![] };
409 visit_op(&mut extra_comments);
410 for comment in extra_comments.comments {
411 writeln!(write, "{:A$} // {}", "", comment, A = ALIGN)?;
416 struct ExtraComments<'tcx> {
418 comments: Vec<String>,
421 impl ExtraComments<'tcx> {
422 fn push(&mut self, lines: &str) {
423 for line in lines.split('\n') {
424 self.comments.push(line.to_string());
429 fn use_verbose(ty: &&TyS<'tcx>, fn_def: bool) -> bool {
431 ty::Int(_) | ty::Uint(_) | ty::Bool | ty::Char | ty::Float(_) => false,
433 ty::Tuple(g_args) if g_args.is_empty() => false,
434 ty::Tuple(g_args) => g_args.iter().any(|g_arg| use_verbose(&g_arg.expect_ty(), fn_def)),
435 ty::Array(ty, _) => use_verbose(ty, fn_def),
436 ty::FnDef(..) => fn_def,
441 impl Visitor<'tcx> for ExtraComments<'tcx> {
442 fn visit_constant(&mut self, constant: &Constant<'tcx>, location: Location) {
443 self.super_constant(constant, location);
444 let Constant { span, user_ty, literal } = constant;
445 if use_verbose(&literal.ty(), true) {
446 self.push("mir::Constant");
449 self.tcx.sess.source_map().span_to_embeddable_string(*span)
451 if let Some(user_ty) = user_ty {
452 self.push(&format!("+ user_ty: {:?}", user_ty));
455 ConstantKind::Ty(literal) => self.push(&format!("+ literal: {:?}", literal)),
456 ConstantKind::Val(val, ty) => {
457 // To keep the diffs small, we render this almost like we render ty::Const
458 self.push(&format!("+ literal: Const {{ ty: {}, val: Value({:?}) }}", ty, val))
464 fn visit_const(&mut self, constant: &&'tcx ty::Const<'tcx>, _: Location) {
465 self.super_const(constant);
466 let ty::Const { ty, val, .. } = constant;
467 if use_verbose(ty, false) {
468 self.push("ty::Const");
469 self.push(&format!("+ ty: {:?}", ty));
470 let val = match val {
471 ty::ConstKind::Param(p) => format!("Param({})", p),
472 ty::ConstKind::Infer(infer) => format!("Infer({:?})", infer),
473 ty::ConstKind::Bound(idx, var) => format!("Bound({:?}, {:?})", idx, var),
474 ty::ConstKind::Placeholder(ph) => format!("PlaceHolder({:?})", ph),
475 ty::ConstKind::Unevaluated(uv) => format!(
476 "Unevaluated({}, {:?}, {:?})",
477 self.tcx.def_path_str(uv.def.did),
481 ty::ConstKind::Value(val) => format!("Value({:?})", val),
482 ty::ConstKind::Error(_) => "Error".to_string(),
484 self.push(&format!("+ val: {}", val));
488 fn visit_rvalue(&mut self, rvalue: &Rvalue<'tcx>, location: Location) {
489 self.super_rvalue(rvalue, location);
490 if let Rvalue::Aggregate(kind, _) = rvalue {
492 AggregateKind::Closure(def_id, substs) => {
493 self.push("closure");
494 self.push(&format!("+ def_id: {:?}", def_id));
495 self.push(&format!("+ substs: {:#?}", substs));
498 AggregateKind::Generator(def_id, substs, movability) => {
499 self.push("generator");
500 self.push(&format!("+ def_id: {:?}", def_id));
501 self.push(&format!("+ substs: {:#?}", substs));
502 self.push(&format!("+ movability: {:?}", movability));
505 AggregateKind::Adt(_, _, _, Some(user_ty), _) => {
507 self.push(&format!("+ user_ty: {:?}", user_ty));
516 fn comment(tcx: TyCtxt<'_>, SourceInfo { span, scope }: SourceInfo) -> String {
517 format!("scope {} at {}", scope.index(), tcx.sess.source_map().span_to_embeddable_string(span))
520 /// Prints local variables in a scope tree.
524 scope_tree: &FxHashMap<SourceScope, Vec<SourceScope>>,
528 ) -> io::Result<()> {
529 let indent = depth * INDENT.len();
531 // Local variable debuginfo.
532 for var_debug_info in &body.var_debug_info {
533 if var_debug_info.source_info.scope != parent {
534 // Not declared in this scope.
538 let indented_debug_info = format!(
539 "{0:1$}debug {2} => {3:?};",
540 INDENT, indent, var_debug_info.name, var_debug_info.value,
548 comment(tcx, var_debug_info.source_info),
552 // Local variable types.
553 for (local, local_decl) in body.local_decls.iter_enumerated() {
554 if (1..body.arg_count + 1).contains(&local.index()) {
555 // Skip over argument locals, they're printed in the signature.
559 if local_decl.source_info.scope != parent {
560 // Not declared in this scope.
564 let mut_str = if local_decl.mutability == Mutability::Mut { "mut " } else { "" };
566 let mut indented_decl =
567 format!("{0:1$}let {2}{3:?}: {4:?}", INDENT, indent, mut_str, local, local_decl.ty);
568 if let Some(user_ty) = &local_decl.user_ty {
569 for user_ty in user_ty.projections() {
570 write!(indented_decl, " as {:?}", user_ty).unwrap();
573 indented_decl.push(';');
576 if local == RETURN_PLACE { " return place".to_string() } else { String::new() };
580 "{0:1$} //{2} in {3}",
584 comment(tcx, local_decl.source_info),
588 let children = match scope_tree.get(&parent) {
589 Some(children) => children,
590 None => return Ok(()),
593 for &child in children {
594 let child_data = &body.source_scopes[child];
595 assert_eq!(child_data.parent_scope, Some(parent));
597 let (special, span) = if let Some((callee, callsite_span)) = child_data.inlined {
601 if callee.def.requires_caller_location(tcx) { "#[track_caller] " } else { "" },
607 (String::new(), None)
610 let indented_header = format!("{0:1$}scope {2}{3} {{", "", indent, child.index(), special);
612 if let Some(span) = span {
618 tcx.sess.source_map().span_to_embeddable_string(span),
621 writeln!(w, "{}", indented_header)?;
624 write_scope_tree(tcx, body, scope_tree, w, child, depth + 1)?;
625 writeln!(w, "{0:1$}}}", "", depth * INDENT.len())?;
631 /// Write out a human-readable textual representation of the MIR's `fn` type and the types of its
632 /// local variables (both user-defined bindings and compiler temporaries).
633 pub fn write_mir_intro<'tcx>(
637 ) -> io::Result<()> {
638 write_mir_sig(tcx, body, w)?;
641 // construct a scope tree and write it out
642 let mut scope_tree: FxHashMap<SourceScope, Vec<SourceScope>> = Default::default();
643 for (index, scope_data) in body.source_scopes.iter().enumerate() {
644 if let Some(parent) = scope_data.parent_scope {
645 scope_tree.entry(parent).or_default().push(SourceScope::new(index));
647 // Only the argument scope has no parent, because it's the root.
648 assert_eq!(index, OUTERMOST_SOURCE_SCOPE.index());
652 write_scope_tree(tcx, body, &scope_tree, w, OUTERMOST_SOURCE_SCOPE, 1)?;
654 // Add an empty line before the first block is printed.
660 /// Find all `AllocId`s mentioned (recursively) in the MIR body and print their corresponding
662 pub fn write_allocations<'tcx>(
666 ) -> io::Result<()> {
667 fn alloc_ids_from_alloc(alloc: &Allocation) -> impl DoubleEndedIterator<Item = AllocId> + '_ {
668 alloc.relocations().values().map(|id| *id)
670 fn alloc_ids_from_const(val: ConstValue<'_>) -> impl Iterator<Item = AllocId> + '_ {
672 ConstValue::Scalar(interpret::Scalar::Ptr(ptr, _size)) => {
673 Either::Left(Either::Left(std::iter::once(ptr.provenance)))
675 ConstValue::Scalar(interpret::Scalar::Int { .. }) => {
676 Either::Left(Either::Right(std::iter::empty()))
678 ConstValue::ByRef { alloc, .. } | ConstValue::Slice { data: alloc, .. } => {
679 Either::Right(alloc_ids_from_alloc(alloc))
683 struct CollectAllocIds(BTreeSet<AllocId>);
684 impl<'tcx> TypeVisitor<'tcx> for CollectAllocIds {
685 fn tcx_for_anon_const_substs(&self) -> Option<TyCtxt<'tcx>> {
686 // `AllocId`s are only inside of `ConstKind::Value` which
687 // can't be part of the anon const default substs.
691 fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
692 if let ty::ConstKind::Value(val) = c.val {
693 self.0.extend(alloc_ids_from_const(val));
695 c.super_visit_with(self)
698 let mut visitor = CollectAllocIds(Default::default());
699 body.visit_with(&mut visitor);
700 // `seen` contains all seen allocations, including the ones we have *not* printed yet.
701 // The protocol is to first `insert` into `seen`, and only if that returns `true`
702 // then push to `todo`.
703 let mut seen = visitor.0;
704 let mut todo: Vec<_> = seen.iter().copied().collect();
705 while let Some(id) = todo.pop() {
706 let mut write_allocation_track_relocs =
707 |w: &mut dyn Write, alloc: &Allocation| -> io::Result<()> {
708 // `.rev()` because we are popping them from the back of the `todo` vector.
709 for id in alloc_ids_from_alloc(alloc).rev() {
714 write!(w, "{}", display_allocation(tcx, alloc))
716 write!(w, "\n{}", id)?;
717 match tcx.get_global_alloc(id) {
718 // This can't really happen unless there are bugs, but it doesn't cost us anything to
719 // gracefully handle it and allow buggy rustc to be debugged via allocation printing.
720 None => write!(w, " (deallocated)")?,
721 Some(GlobalAlloc::Function(inst)) => write!(w, " (fn: {})", inst)?,
722 Some(GlobalAlloc::Static(did)) if !tcx.is_foreign_item(did) => {
723 match tcx.eval_static_initializer(did) {
725 write!(w, " (static: {}, ", tcx.def_path_str(did))?;
726 write_allocation_track_relocs(w, alloc)?;
730 " (static: {}, error during initializer evaluation)",
731 tcx.def_path_str(did)
735 Some(GlobalAlloc::Static(did)) => {
736 write!(w, " (extern static: {})", tcx.def_path_str(did))?
738 Some(GlobalAlloc::Memory(alloc)) => {
740 write_allocation_track_relocs(w, alloc)?
748 /// Dumps the size and metadata and content of an allocation to the given writer.
749 /// The expectation is that the caller first prints other relevant metadata, so the exact
750 /// format of this function is (*without* leading or trailing newline):
753 /// size: {}, align: {}) {
758 /// The byte format is similar to how hex editors print bytes. Each line starts with the address of
759 /// the start of the line, followed by all bytes in hex format (space separated).
760 /// If the allocation is small enough to fit into a single line, no start address is given.
761 /// After the hex dump, an ascii dump follows, replacing all unprintable characters (control
762 /// characters or characters whose value is larger than 127) with a `.`
763 /// This also prints relocations adequately.
764 pub fn display_allocation<Tag, Extra>(
766 alloc: &'a Allocation<Tag, Extra>,
767 ) -> RenderAllocation<'a, 'tcx, Tag, Extra> {
768 RenderAllocation { tcx, alloc }
772 pub struct RenderAllocation<'a, 'tcx, Tag, Extra> {
774 alloc: &'a Allocation<Tag, Extra>,
777 impl<Tag: Provenance, Extra> std::fmt::Display for RenderAllocation<'a, 'tcx, Tag, Extra> {
778 fn fmt(&self, w: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
779 let RenderAllocation { tcx, alloc } = *self;
780 write!(w, "size: {}, align: {})", alloc.size().bytes(), alloc.align.bytes())?;
781 if alloc.size() == Size::ZERO {
783 return write!(w, " {{}}");
785 // Write allocation bytes.
787 write_allocation_bytes(tcx, alloc, w, " ")?;
793 fn write_allocation_endline(w: &mut dyn std::fmt::Write, ascii: &str) -> std::fmt::Result {
794 for _ in 0..(BYTES_PER_LINE - ascii.chars().count()) {
797 writeln!(w, " │ {}", ascii)
800 /// Number of bytes to print per allocation hex dump line.
801 const BYTES_PER_LINE: usize = 16;
803 /// Prints the line start address and returns the new line start address.
804 fn write_allocation_newline(
805 w: &mut dyn std::fmt::Write,
806 mut line_start: Size,
810 ) -> Result<Size, std::fmt::Error> {
811 write_allocation_endline(w, ascii)?;
812 line_start += Size::from_bytes(BYTES_PER_LINE);
813 write!(w, "{}0x{:02$x} │ ", prefix, line_start.bytes(), pos_width)?;
817 /// The `prefix` argument allows callers to add an arbitrary prefix before each line (even if there
818 /// is only one line). Note that your prefix should contain a trailing space as the lines are
819 /// printed directly after it.
820 fn write_allocation_bytes<Tag: Provenance, Extra>(
822 alloc: &Allocation<Tag, Extra>,
823 w: &mut dyn std::fmt::Write,
825 ) -> std::fmt::Result {
826 let num_lines = alloc.size().bytes_usize().saturating_sub(BYTES_PER_LINE);
827 // Number of chars needed to represent all line numbers.
828 let pos_width = hex_number_length(alloc.size().bytes());
831 write!(w, "{}0x{:02$x} │ ", prefix, 0, pos_width)?;
833 write!(w, "{}", prefix)?;
836 let mut i = Size::ZERO;
837 let mut line_start = Size::ZERO;
839 let ptr_size = tcx.data_layout.pointer_size;
841 let mut ascii = String::new();
843 let oversized_ptr = |target: &mut String, width| {
844 if target.len() > width {
845 write!(target, " ({} ptr bytes)", ptr_size.bytes()).unwrap();
849 while i < alloc.size() {
850 // The line start already has a space. While we could remove that space from the line start
851 // printing and unconditionally print a space here, that would cause the single-line case
852 // to have a single space before it, which looks weird.
856 if let Some(&tag) = alloc.relocations().get(&i) {
857 // Memory with a relocation must be defined
858 let j = i.bytes_usize();
860 .inspect_with_uninit_and_ptr_outside_interpreter(j..j + ptr_size.bytes_usize());
861 let offset = read_target_uint(tcx.data_layout.endian, offset).unwrap();
862 let offset = Size::from_bytes(offset);
863 let relocation_width = |bytes| bytes * 3;
864 let ptr = Pointer::new(tag, offset);
865 let mut target = format!("{:?}", ptr);
866 if target.len() > relocation_width(ptr_size.bytes_usize() - 1) {
867 // This is too long, try to save some space.
868 target = format!("{:#?}", ptr);
870 if ((i - line_start) + ptr_size).bytes_usize() > BYTES_PER_LINE {
871 // This branch handles the situation where a relocation starts in the current line
872 // but ends in the next one.
873 let remainder = Size::from_bytes(BYTES_PER_LINE) - (i - line_start);
874 let overflow = ptr_size - remainder;
875 let remainder_width = relocation_width(remainder.bytes_usize()) - 2;
876 let overflow_width = relocation_width(overflow.bytes_usize() - 1) + 1;
878 for _ in 0..remainder.bytes() - 1 {
881 if overflow_width > remainder_width && overflow_width >= target.len() {
882 // The case where the relocation fits into the part in the next line
883 write!(w, "╾{0:─^1$}", "", remainder_width)?;
885 write_allocation_newline(w, line_start, &ascii, pos_width, prefix)?;
887 write!(w, "{0:─^1$}╼", target, overflow_width)?;
889 oversized_ptr(&mut target, remainder_width);
890 write!(w, "╾{0:─^1$}", target, remainder_width)?;
892 write_allocation_newline(w, line_start, &ascii, pos_width, prefix)?;
893 write!(w, "{0:─^1$}╼", "", overflow_width)?;
896 for _ in 0..overflow.bytes() - 1 {
903 // This branch handles a relocation that starts and ends in the current line.
904 let relocation_width = relocation_width(ptr_size.bytes_usize() - 1);
905 oversized_ptr(&mut target, relocation_width);
907 write!(w, "╾{0:─^1$}╼", target, relocation_width)?;
908 for _ in 0..ptr_size.bytes() - 2 {
914 } else if alloc.init_mask().is_range_initialized(i, i + Size::from_bytes(1)).is_ok() {
915 let j = i.bytes_usize();
917 // Checked definedness (and thus range) and relocations. This access also doesn't
918 // influence interpreter execution but is only for debugging.
919 let c = alloc.inspect_with_uninit_and_ptr_outside_interpreter(j..j + 1)[0];
920 write!(w, "{:02x}", c)?;
921 if c.is_ascii_control() || c >= 0x80 {
924 ascii.push(char::from(c));
926 i += Size::from_bytes(1);
930 i += Size::from_bytes(1);
932 // Print a new line header if the next line still has some bytes to print.
933 if i == line_start + Size::from_bytes(BYTES_PER_LINE) && i != alloc.size() {
934 line_start = write_allocation_newline(w, line_start, &ascii, pos_width, prefix)?;
938 write_allocation_endline(w, &ascii)?;
943 fn write_mir_sig(tcx: TyCtxt<'_>, body: &Body<'_>, w: &mut dyn Write) -> io::Result<()> {
944 use rustc_hir::def::DefKind;
946 trace!("write_mir_sig: {:?}", body.source.instance);
947 let def_id = body.source.def_id();
948 let kind = tcx.def_kind(def_id);
949 let is_function = match kind {
950 DefKind::Fn | DefKind::AssocFn | DefKind::Ctor(..) => true,
951 _ => tcx.is_closure(def_id),
953 match (kind, body.source.promoted) {
954 (_, Some(i)) => write!(w, "{:?} in ", i)?,
955 (DefKind::Const | DefKind::AssocConst, _) => write!(w, "const ")?,
956 (DefKind::Static, _) => {
957 write!(w, "static {}", if tcx.is_mutable_static(def_id) { "mut " } else { "" })?
959 (_, _) if is_function => write!(w, "fn ")?,
960 (DefKind::AnonConst, _) => {} // things like anon const, not an item
961 _ => bug!("Unexpected def kind {:?}", kind),
964 ty::print::with_forced_impl_filename_line(|| {
965 // see notes on #41697 elsewhere
966 write!(w, "{}", tcx.def_path_str(def_id))
969 if body.source.promoted.is_none() && is_function {
972 // fn argument types.
973 for (i, arg) in body.args_iter().enumerate() {
977 write!(w, "{:?}: {}", Place::from(arg), body.local_decls[arg].ty)?;
980 write!(w, ") -> {}", body.return_ty())?;
982 assert_eq!(body.arg_count, 0);
983 write!(w, ": {} =", body.return_ty())?;
986 if let Some(yield_ty) = body.yield_ty() {
988 writeln!(w, "yields {}", yield_ty)?;
992 // Next thing that gets printed is the opening {
997 fn write_user_type_annotations(
1001 ) -> io::Result<()> {
1002 if !body.user_type_annotations.is_empty() {
1003 writeln!(w, "| User Type Annotations")?;
1005 for (index, annotation) in body.user_type_annotations.iter_enumerated() {
1008 "| {:?}: {:?} at {}",
1011 tcx.sess.source_map().span_to_embeddable_string(annotation.span)
1014 if !body.user_type_annotations.is_empty() {
1020 pub fn dump_mir_def_ids(tcx: TyCtxt<'_>, single: Option<DefId>) -> Vec<DefId> {
1021 if let Some(i) = single {
1024 tcx.mir_keys(()).iter().map(|def_id| def_id.to_def_id()).collect()
1028 /// Calc converted u64 decimal into hex and return it's length in chars
1030 /// ```ignore (cannot-test-private-function)
1031 /// assert_eq!(1, hex_number_length(0));
1032 /// assert_eq!(1, hex_number_length(1));
1033 /// assert_eq!(2, hex_number_length(16));
1035 fn hex_number_length(x: u64) -> usize {