Remove pretty printing of specific nodes in AST

The ability to print a specific item as identified by NodeId or path
seems not particularly useful, and certainly carries quite a bit of
complexity with it.

Author: Mark-Simulacrum

src/librustc/session/config.rs

@@ -1,13 +1,10 @@
 //! Contains infrastructure for configuring the compiler, including parsing
 //! command-line options.
 
-// ignore-tidy-filelength
-
 use crate::lint;
 use crate::middle::cstore;
 use crate::session::{early_error, early_warn, Session};
 use crate::session::search_paths::SearchPath;
-use crate::hir::map as hir_map;
 
 use rustc_data_structures::fx::FxHashSet;
 
@@ -444,7 +441,7 @@ top_level_options!(
         // by the compiler.
         json_artifact_notifications: bool [TRACKED],
 
-        pretty: Option<(PpMode, Option<UserIdentifiedItem>)> [UNTRACKED],
+        pretty: Option<PpMode> [UNTRACKED],
     }
 );
 
@@ -2560,7 +2557,7 @@ fn parse_pretty(
     matches: &getopts::Matches,
     debugging_opts: &DebuggingOptions,
     efmt: ErrorOutputType,
-) -> Option<(PpMode, Option<UserIdentifiedItem>)> {
+) -> Option<PpMode> {
     let pretty = if debugging_opts.unstable_options {
         matches.opt_default("pretty", "normal").map(|a| {
             // stable pretty-print variants only
@@ -2583,13 +2580,10 @@ fn parse_pretty(
         efmt: ErrorOutputType,
         name: &str,
         extended: bool,
-    ) -> (PpMode, Option<UserIdentifiedItem>) {
+    ) -> PpMode {
         use PpMode::*;
         use PpSourceMode::*;
-        let mut split = name.splitn(2, '=');
-        let first = split.next().unwrap();
-        let opt_second = split.next();
-        let first = match (first, extended) {
+        let first = match (name, extended) {
             ("normal", _) => PpmSource(PpmNormal),
             ("identified", _) => PpmSource(PpmIdentified),
             ("everybody_loops", true) => PpmSource(PpmEveryBodyLoops),
@@ -2617,8 +2611,7 @@ fn parse_pretty(
                 }
             }
         };
-        let opt_second = opt_second.and_then(|s| s.parse::<UserIdentifiedItem>().ok());
-        (first, opt_second)
+        first
     }
 }
 
@@ -2750,13 +2743,13 @@ pub enum PpMode {
 }
 
 impl PpMode {
-    pub fn needs_ast_map(&self, opt_uii: &Option<UserIdentifiedItem>) -> bool {
+    pub fn needs_ast_map(&self) -> bool {
         use PpMode::*;
         use PpSourceMode::*;
         match *self {
             PpmSource(PpmNormal) |
             PpmSource(PpmEveryBodyLoops) |
-            PpmSource(PpmIdentified) => opt_uii.is_some(),
+            PpmSource(PpmIdentified) => false,
 
             PpmSource(PpmExpanded) |
             PpmSource(PpmExpandedIdentified) |
@@ -2778,102 +2771,6 @@ impl PpMode {
     }
 }
 
-#[derive(Clone, Debug)]
-pub enum UserIdentifiedItem {
-    ItemViaNode(ast::NodeId),
-    ItemViaPath(Vec<String>),
-}
-
-impl FromStr for UserIdentifiedItem {
-    type Err = ();
-    fn from_str(s: &str) -> Result<UserIdentifiedItem, ()> {
-        use UserIdentifiedItem::*;
-        Ok(s.parse()
-            .map(ast::NodeId::from_u32)
-            .map(ItemViaNode)
-            .unwrap_or_else(|_| ItemViaPath(s.split("::").map(|s| s.to_string()).collect())))
-    }
-}
-
-pub enum NodesMatchingUII<'a> {
-    NodesMatchingDirect(std::option::IntoIter<ast::NodeId>),
-    NodesMatchingSuffix(Box<dyn Iterator<Item = ast::NodeId> + 'a>),
-}
-
-impl<'a> Iterator for NodesMatchingUII<'a> {
-    type Item = ast::NodeId;
-
-    fn next(&mut self) -> Option<ast::NodeId> {
-        use NodesMatchingUII::*;
-        match self {
-            &mut NodesMatchingDirect(ref mut iter) => iter.next(),
-            &mut NodesMatchingSuffix(ref mut iter) => iter.next(),
-        }
-    }
-
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        use NodesMatchingUII::*;
-        match self {
-            &NodesMatchingDirect(ref iter) => iter.size_hint(),
-            &NodesMatchingSuffix(ref iter) => iter.size_hint(),
-        }
-    }
-}
-
-impl UserIdentifiedItem {
-    pub fn reconstructed_input(&self) -> String {
-        use UserIdentifiedItem::*;
-        match *self {
-            ItemViaNode(node_id) => node_id.to_string(),
-            ItemViaPath(ref parts) => parts.join("::"),
-        }
-    }
-
-    pub fn all_matching_node_ids<'a, 'hir>(&'a self,
-                                       map: &'a hir_map::Map<'hir>)
-                                       -> NodesMatchingUII<'a> {
-        use UserIdentifiedItem::*;
-        use NodesMatchingUII::*;
-        match *self {
-            ItemViaNode(node_id) => NodesMatchingDirect(Some(node_id).into_iter()),
-            ItemViaPath(ref parts) => {
-                NodesMatchingSuffix(Box::new(map.nodes_matching_suffix(&parts)))
-            }
-        }
-    }
-
-    pub fn to_one_node_id(self,
-                      user_option: &str,
-                      sess: &Session,
-                      map: &hir_map::Map<'_>)
-                      -> ast::NodeId {
-        let fail_because = |is_wrong_because| -> ast::NodeId {
-            let message = format!("{} needs NodeId (int) or unique path suffix (b::c::d); got \
-                                   {}, which {}",
-                                  user_option,
-                                  self.reconstructed_input(),
-                                  is_wrong_because);
-            sess.fatal(&message)
-        };
-
-        let mut saw_node = ast::DUMMY_NODE_ID;
-        let mut seen = 0;
-        for node in self.all_matching_node_ids(map) {
-            saw_node = node;
-            seen += 1;
-            if seen > 1 {
-                fail_because("does not resolve uniquely");
-            }
-        }
-        if seen == 0 {
-            fail_because("does not resolve to any item");
-        }
-
-        assert!(seen == 1);
-        return saw_node;
-    }
-}
-
 /// Command-line arguments passed to the compiler have to be incorporated with
 /// the dependency tracking system for incremental compilation. This module
 /// provides some utilities to make this more convenient.

src/librustc_driver/lib.rs

@@ -292,16 +292,15 @@ pub fn run_compiler(
 
         compiler.parse()?;
 
-        if let Some((ppm, opt_uii)) = &sess.opts.pretty {
-            if ppm.needs_ast_map(&opt_uii) {
+        if let Some(ppm) = &sess.opts.pretty {
+            if ppm.needs_ast_map() {
                 compiler.global_ctxt()?.peek_mut().enter(|tcx| {
                     let expanded_crate = compiler.expansion()?.take().0;
                     pretty::print_after_hir_lowering(
                         tcx,
                         compiler.input(),
                         &expanded_crate,
                         *ppm,
-                        opt_uii.clone(),
                         compiler.output_file().as_ref().map(|p| &**p),
                     );
                     Ok(())

src/librustc_driver/pretty.rs

@@ -5,7 +5,7 @@ use rustc::hir::map as hir_map;
 use rustc::hir::print as pprust_hir;
 use rustc::hir::def_id::LOCAL_CRATE;
 use rustc::session::Session;
-use rustc::session::config::{PpMode, PpSourceMode, UserIdentifiedItem, Input};
+use rustc::session::config::{PpMode, PpSourceMode, Input};
 use rustc::ty::{self, TyCtxt};
 use rustc::util::common::ErrorReported;
 use rustc_mir::util::{write_mir_pretty, write_mir_graphviz};
@@ -19,7 +19,6 @@ use std::fs::File;
 use std::io::Write;
 use std::path::Path;
 
-pub use self::UserIdentifiedItem::*;
 pub use self::PpSourceMode::*;
 pub use self::PpMode::*;
 use crate::abort_on_err;
@@ -448,14 +447,12 @@ pub fn print_after_hir_lowering<'tcx>(
     input: &Input,
     krate: &ast::Crate,
     ppm: PpMode,
-    opt_uii: Option<UserIdentifiedItem>,
     ofile: Option<&Path>,
 ) {
     if ppm.needs_analysis() {
         abort_on_err(print_with_analysis(
             tcx,
             ppm,
-            opt_uii,
             ofile
         ), tcx.sess);
         return;
@@ -465,8 +462,8 @@ pub fn print_after_hir_lowering<'tcx>(
 
     let mut out = String::new();
 
-    match (ppm, opt_uii) {
-            (PpmSource(s), _) => {
+    match ppm {
+            PpmSource(s) => {
                 // Silently ignores an identified node.
                 let out = &mut out;
                 let src = src.clone();
@@ -483,7 +480,7 @@ pub fn print_after_hir_lowering<'tcx>(
                 })
             }
 
-            (PpmHir(s), None) => {
+            PpmHir(s) => {
                 let out = &mut out;
                 let src = src.clone();
                 call_with_pp_support_hir(&s, tcx, move |annotation, krate| {
@@ -498,52 +495,14 @@ pub fn print_after_hir_lowering<'tcx>(
                 })
             }
 
-            (PpmHirTree(s), None) => {
+            PpmHirTree(s) => {
                 let out = &mut out;
                 call_with_pp_support_hir(&s, tcx, move |_annotation, krate| {
                     debug!("pretty printing source code {:?}", s);
                     *out = format!("{:#?}", krate);
                 });
             }
 
-            (PpmHir(s), Some(uii)) => {
-                let out = &mut out;
-                let src = src.clone();
-                call_with_pp_support_hir(&s, tcx, move |annotation, _| {
-                    debug!("pretty printing source code {:?}", s);
-                    let sess = annotation.sess();
-                    let hir_map = annotation.hir_map().expect("-Z unpretty missing HIR map");
-                    let mut pp_state = pprust_hir::State::new_from_input(sess.source_map(),
-                                                                         &sess.parse_sess,
-                                                                         src_name,
-                                                                         src,
-                                                                         annotation.pp_ann());
-                    for node_id in uii.all_matching_node_ids(hir_map) {
-                        let hir_id = tcx.hir().node_to_hir_id(node_id);
-                        let node = hir_map.get(hir_id);
-                        pp_state.print_node(node);
-                        pp_state.s.space();
-                        let path = annotation.node_path(hir_id)
-                            .expect("-Z unpretty missing node paths");
-                        pp_state.synth_comment(path);
-                        pp_state.s.hardbreak();
-                    }
-                    *out = pp_state.s.eof();
-                })
-            }
-
-            (PpmHirTree(s), Some(uii)) => {
-                let out = &mut out;
-                call_with_pp_support_hir(&s, tcx, move |_annotation, _krate| {
-                    debug!("pretty printing source code {:?}", s);
-                    for node_id in uii.all_matching_node_ids(tcx.hir()) {
-                        let hir_id = tcx.hir().node_to_hir_id(node_id);
-                        let node = tcx.hir().get(hir_id);
-                        out.push_str(&format!("{:#?}", node));
-                    }
-                })
-            }
-
             _ => unreachable!(),
         }
 
@@ -557,27 +516,17 @@ pub fn print_after_hir_lowering<'tcx>(
 fn print_with_analysis(
     tcx: TyCtxt<'_>,
     ppm: PpMode,
-    uii: Option<UserIdentifiedItem>,
     ofile: Option<&Path>,
 ) -> Result<(), ErrorReported> {
-    let nodeid = if let Some(uii) = uii {
-        debug!("pretty printing for {:?}", uii);
-        Some(uii.to_one_node_id("-Z unpretty", tcx.sess, tcx.hir()))
-    } else {
-        debug!("pretty printing for whole crate");
-        None
-    };
-
     let mut out = Vec::new();
 
     tcx.analysis(LOCAL_CRATE)?;
 
     match ppm {
         PpmMir | PpmMirCFG => {
-            let def_id = nodeid.map(|nid| tcx.hir().local_def_id_from_node_id(nid));
             match ppm {
-                PpmMir => write_mir_pretty(tcx, def_id, &mut out),
-                PpmMirCFG => write_mir_graphviz(tcx, def_id, &mut out),
+                PpmMir => write_mir_pretty(tcx, None, &mut out),
+                PpmMirCFG => write_mir_graphviz(tcx, None, &mut out),
                 _ => unreachable!(),
             }
         }

src/librustc_interface/passes.rs

@@ -388,7 +388,7 @@ fn configure_and_expand_inner<'a>(
     // If we're actually rustdoc then there's no need to actually compile
     // anything, so switch everything to just looping
     let mut should_loop = sess.opts.actually_rustdoc;
-    if let Some((PpMode::PpmSource(PpSourceMode::PpmEveryBodyLoops), _)) = sess.opts.pretty {
+    if let Some(PpMode::PpmSource(PpSourceMode::PpmEveryBodyLoops)) = sess.opts.pretty {
         should_loop |= true;
     }
     if should_loop {