Rename all ParseSess variables/fields/lifetimes as psess.

Existing names for values of this type are `sess`, `parse_sess`,
`parse_session`, and `ps`. `sess` is particularly annoying because
that's also used for `Session` values, which are often co-located, and
it can be difficult to know which type a value named `sess` refers to.
(That annoyance is the main motivation for this change.) `psess` is nice
and short, which is good for a name used this much.

The commit also renames some `parse_sess_created` values as
`psess_created`.

compiler/rustc_ast_lowering/src/expr.rs

@@ -125,12 +125,8 @@ impl<'hir> LoweringContext<'_, 'hir> {
                     let lit_kind = match LitKind::from_token_lit(*token_lit) {
                         Ok(lit_kind) => lit_kind,
                         Err(err) => {
-                            let guar = report_lit_error(
-                                &self.tcx.sess.parse_sess,
-                                err,
-                                *token_lit,
-                                e.span,
-                            );
+                            let guar =
+                                report_lit_error(&self.tcx.sess.psess, err, *token_lit, e.span);
                             LitKind::Err(guar)
                         }
                     };
@@ -721,7 +717,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
                         sym::track_caller,
                         span,
                     )))),
-                    id: self.tcx.sess.parse_sess.attr_id_generator.mk_attr_id(),
+                    id: self.tcx.sess.psess.attr_id_generator.mk_attr_id(),
                     style: AttrStyle::Outer,
                     span: unstable_span,
                 }],
@@ -1756,7 +1752,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
 
         // `#[allow(unreachable_code)]`
         let attr = attr::mk_attr_nested_word(
-            &self.tcx.sess.parse_sess.attr_id_generator,
+            &self.tcx.sess.psess.attr_id_generator,
             AttrStyle::Outer,
             sym::allow,
             sym::unreachable_code,

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -835,7 +835,7 @@ fn validate_generic_param_order(
 
 impl<'a> Visitor<'a> for AstValidator<'a> {
     fn visit_attribute(&mut self, attr: &Attribute) {
-        validate_attr::check_attr(&self.session.parse_sess, attr);
+        validate_attr::check_attr(&self.session.psess, attr);
     }
 
     fn visit_ty(&mut self, ty: &'a Ty) {

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -507,7 +507,7 @@ pub fn check_crate(krate: &ast::Crate, sess: &Session, features: &Features) {
     check_incompatible_features(sess, features);
     let mut visitor = PostExpansionVisitor { sess, features };
 
-    let spans = sess.parse_sess.gated_spans.spans.borrow();
+    let spans = sess.psess.gated_spans.spans.borrow();
     macro_rules! gate_all {
         ($gate:ident, $msg:literal) => {
             if let Some(spans) = spans.get(&sym::$gate) {

compiler/rustc_attr/src/builtin.rs

@@ -524,9 +524,9 @@ pub fn cfg_matches(
 ) -> bool {
     eval_condition(cfg, sess, features, &mut |cfg| {
         try_gate_cfg(cfg.name, cfg.span, sess, features);
-        match sess.parse_sess.check_config.expecteds.get(&cfg.name) {
+        match sess.psess.check_config.expecteds.get(&cfg.name) {
             Some(ExpectedValues::Some(values)) if !values.contains(&cfg.value) => {
-                sess.parse_sess.buffer_lint_with_diagnostic(
+                sess.psess.buffer_lint_with_diagnostic(
                     UNEXPECTED_CFGS,
                     cfg.span,
                     lint_node_id,
@@ -541,8 +541,8 @@ pub fn cfg_matches(
                     ),
                 );
             }
-            None if sess.parse_sess.check_config.exhaustive_names => {
-                sess.parse_sess.buffer_lint_with_diagnostic(
+            None if sess.psess.check_config.exhaustive_names => {
+                sess.psess.buffer_lint_with_diagnostic(
                     UNEXPECTED_CFGS,
                     cfg.span,
                     lint_node_id,
@@ -555,7 +555,7 @@ pub fn cfg_matches(
             }
             _ => { /* not unexpected */ }
         }
-        sess.parse_sess.config.contains(&(cfg.name, cfg.value))
+        sess.psess.config.contains(&(cfg.name, cfg.value))
     })
 }
 
@@ -598,7 +598,7 @@ pub fn eval_condition(
     features: Option<&Features>,
     eval: &mut impl FnMut(Condition) -> bool,
 ) -> bool {
-    let dcx = &sess.parse_sess.dcx;
+    let dcx = &sess.psess.dcx;
     match &cfg.kind {
         ast::MetaItemKind::List(mis) if cfg.name_or_empty() == sym::version => {
             try_gate_cfg(sym::version, cfg.span, sess, features);
@@ -626,7 +626,7 @@ pub fn eval_condition(
             };
 
             // See https://github.com/rust-lang/rust/issues/64796#issuecomment-640851454 for details
-            if sess.parse_sess.assume_incomplete_release {
+            if sess.psess.assume_incomplete_release {
                 RustcVersion::CURRENT > min_version
             } else {
                 RustcVersion::CURRENT >= min_version

compiler/rustc_builtin_macros/src/asm.rs

@@ -45,7 +45,7 @@ pub fn parse_asm_args<'a>(
     sp: Span,
     is_global_asm: bool,
 ) -> PResult<'a, AsmArgs> {
-    let dcx = &p.sess.dcx;
+    let dcx = &p.psess.dcx;
 
     if p.token == token::Eof {
         return Err(dcx.create_err(errors::AsmRequiresTemplate { span: sp }));
@@ -296,7 +296,7 @@ pub fn parse_asm_args<'a>(
 fn err_duplicate_option(p: &mut Parser<'_>, symbol: Symbol, span: Span) {
     // Tool-only output
     let full_span = if p.token.kind == token::Comma { span.to(p.token.span) } else { span };
-    p.sess.dcx.emit_err(errors::AsmOptAlreadyprovided { span, symbol, full_span });
+    p.psess.dcx.emit_err(errors::AsmOptAlreadyprovided { span, symbol, full_span });
 }
 
 /// Try to set the provided option in the provided `AsmArgs`.
@@ -368,7 +368,7 @@ fn parse_clobber_abi<'a>(p: &mut Parser<'a>, args: &mut AsmArgs) -> PResult<'a,
     p.expect(&token::OpenDelim(Delimiter::Parenthesis))?;
 
     if p.eat(&token::CloseDelim(Delimiter::Parenthesis)) {
-        return Err(p.sess.dcx.create_err(errors::NonABI { span: p.token.span }));
+        return Err(p.psess.dcx.create_err(errors::NonABI { span: p.token.span }));
     }
 
     let mut new_abis = Vec::new();
@@ -379,7 +379,7 @@ fn parse_clobber_abi<'a>(p: &mut Parser<'a>, args: &mut AsmArgs) -> PResult<'a,
             }
             Err(opt_lit) => {
                 let span = opt_lit.map_or(p.token.span, |lit| lit.span);
-                let mut err = p.sess.dcx.struct_span_err(span, "expected string literal");
+                let mut err = p.psess.dcx.struct_span_err(span, "expected string literal");
                 err.span_label(span, "not a string literal");
                 return Err(err);
             }
@@ -495,15 +495,15 @@ fn expand_preparsed_asm(
             };
 
             if template_str.contains(".intel_syntax") {
-                ecx.parse_sess().buffer_lint(
+                ecx.psess().buffer_lint(
                     lint::builtin::BAD_ASM_STYLE,
                     find_span(".intel_syntax"),
                     ecx.current_expansion.lint_node_id,
                     "avoid using `.intel_syntax`, Intel syntax is the default",
                 );
             }
             if template_str.contains(".att_syntax") {
-                ecx.parse_sess().buffer_lint(
+                ecx.psess().buffer_lint(
                     lint::builtin::BAD_ASM_STYLE,
                     find_span(".att_syntax"),
                     ecx.current_expansion.lint_node_id,

compiler/rustc_builtin_macros/src/cfg_accessible.rs

@@ -46,7 +46,7 @@ impl MultiItemModifier for Expander {
     ) -> ExpandResult<Vec<Annotatable>, Annotatable> {
         let template = AttributeTemplate { list: Some("path"), ..Default::default() };
         validate_attr::check_builtin_meta_item(
-            &ecx.sess.parse_sess,
+            &ecx.sess.psess,
             meta_item,
             ast::AttrStyle::Outer,
             sym::cfg_accessible,

compiler/rustc_builtin_macros/src/cfg_eval.rs

@@ -195,8 +195,7 @@ impl CfgEval<'_, '_> {
         // Re-parse the tokens, setting the `capture_cfg` flag to save extra information
         // to the captured `AttrTokenStream` (specifically, we capture
         // `AttrTokenTree::AttributesData` for all occurrences of `#[cfg]` and `#[cfg_attr]`)
-        let mut parser =
-            rustc_parse::stream_to_parser(&self.cfg.sess.parse_sess, orig_tokens, None);
+        let mut parser = rustc_parse::stream_to_parser(&self.cfg.sess.psess, orig_tokens, None);
         parser.capture_cfg = true;
         match parse_annotatable_with(&mut parser) {
             Ok(a) => annotatable = a,

compiler/rustc_builtin_macros/src/cmdline_attrs.rs

@@ -7,10 +7,10 @@ use rustc_ast::{self as ast, AttrItem, AttrStyle};
 use rustc_session::parse::ParseSess;
 use rustc_span::FileName;
 
-pub fn inject(krate: &mut ast::Crate, parse_sess: &ParseSess, attrs: &[String]) {
+pub fn inject(krate: &mut ast::Crate, psess: &ParseSess, attrs: &[String]) {
     for raw_attr in attrs {
         let mut parser = rustc_parse::new_parser_from_source_str(
-            parse_sess,
+            psess,
             FileName::cli_crate_attr_source_code(raw_attr),
             raw_attr.clone(),
         );
@@ -25,12 +25,12 @@ pub fn inject(krate: &mut ast::Crate, parse_sess: &ParseSess, attrs: &[String])
         };
         let end_span = parser.token.span;
         if parser.token != token::Eof {
-            parse_sess.dcx.emit_err(errors::InvalidCrateAttr { span: start_span.to(end_span) });
+            psess.dcx.emit_err(errors::InvalidCrateAttr { span: start_span.to(end_span) });
             continue;
         }
 
         krate.attrs.push(mk_attr(
-            &parse_sess.attr_id_generator,
+            &psess.attr_id_generator,
             AttrStyle::Inner,
             path,
             args,

compiler/rustc_builtin_macros/src/concat.rs

@@ -43,7 +43,7 @@ pub fn expand_concat(
                     guar = Some(guarantee);
                 }
                 Err(err) => {
-                    guar = Some(report_lit_error(&cx.sess.parse_sess, err, token_lit, e.span));
+                    guar = Some(report_lit_error(&cx.sess.psess, err, token_lit, e.span));
                 }
             },
             // We also want to allow negative numeric literals.
@@ -52,7 +52,7 @@ pub fn expand_concat(
                     Ok(LitKind::Int(i, _)) => accumulator.push_str(&format!("-{i}")),
                     Ok(LitKind::Float(f, _)) => accumulator.push_str(&format!("-{f}")),
                     Err(err) => {
-                        guar = Some(report_lit_error(&cx.sess.parse_sess, err, token_lit, e.span));
+                        guar = Some(report_lit_error(&cx.sess.psess, err, token_lit, e.span));
                     }
                     _ => missing_literal.push(e.span),
                 }

compiler/rustc_builtin_macros/src/concat_bytes.rs

@@ -55,7 +55,7 @@ fn invalid_type_err(
         Ok(LitKind::Int(_, _)) => dcx.emit_err(ConcatBytesNonU8 { span }),
         Ok(LitKind::ByteStr(..) | LitKind::Byte(_)) => unreachable!(),
         Ok(LitKind::Err(guar)) => guar,
-        Err(err) => report_lit_error(&cx.sess.parse_sess, err, token_lit, span),
+        Err(err) => report_lit_error(&cx.sess.psess, err, token_lit, span),
     }
 }
 

compiler/rustc_builtin_macros/src/derive.rs

@@ -34,7 +34,7 @@ impl MultiItemModifier for Expander {
                 let template =
                     AttributeTemplate { list: Some("Trait1, Trait2, ..."), ..Default::default() };
                 validate_attr::check_builtin_meta_item(
-                    &sess.parse_sess,
+                    &sess.psess,
                     meta_item,
                     ast::AttrStyle::Outer,
                     sym::derive,

compiler/rustc_builtin_macros/src/deriving/generic/mod.rs

@@ -1624,7 +1624,7 @@ impl<'a> TraitDef<'a> {
                         };
 
                         if let Some(ty) = exception {
-                            cx.sess.parse_sess.buffer_lint_with_diagnostic(
+                            cx.sess.psess.buffer_lint_with_diagnostic(
                                 BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE,
                                 sp,
                                 ast::CRATE_NODE_ID,

compiler/rustc_builtin_macros/src/env.rs

@@ -39,7 +39,7 @@ pub fn expand_option_env<'cx>(
 
     let sp = cx.with_def_site_ctxt(sp);
     let value = lookup_env(cx, var);
-    cx.sess.parse_sess.env_depinfo.borrow_mut().insert((var, value));
+    cx.sess.psess.env_depinfo.borrow_mut().insert((var, value));
     let e = match value {
         None => {
             let lt = cx.lifetime(sp, Ident::new(kw::StaticLifetime, sp));
@@ -94,7 +94,7 @@ pub fn expand_env<'cx>(
 
     let span = cx.with_def_site_ctxt(sp);
     let value = lookup_env(cx, var);
-    cx.sess.parse_sess.env_depinfo.borrow_mut().insert((var, value));
+    cx.sess.psess.env_depinfo.borrow_mut().insert((var, value));
     let e = match value {
         None => {
             let ExprKind::Lit(token::Lit {

compiler/rustc_builtin_macros/src/source_util.rs

@@ -118,7 +118,7 @@ pub fn expand_include<'cx>(
             return DummyResult::any(sp, guar);
         }
     };
-    let p = new_parser_from_file(cx.parse_sess(), &file, Some(sp));
+    let p = new_parser_from_file(cx.psess(), &file, Some(sp));
 
     // If in the included file we have e.g., `mod bar;`,
     // then the path of `bar.rs` should be relative to the directory of `file`.
@@ -136,7 +136,7 @@ pub fn expand_include<'cx>(
         fn make_expr(mut self: Box<ExpandResult<'a>>) -> Option<P<ast::Expr>> {
             let expr = parse_expr(&mut self.p).ok()?;
             if self.p.token != token::Eof {
-                self.p.sess.buffer_lint(
+                self.p.psess.buffer_lint(
                     INCOMPLETE_INCLUDE,
                     self.p.token.span,
                     self.node_id,

compiler/rustc_builtin_macros/src/standard_library_imports.rs

@@ -17,7 +17,7 @@ pub fn inject(
     features: &Features,
 ) -> usize {
     let orig_num_items = krate.items.len();
-    let edition = sess.parse_sess.edition;
+    let edition = sess.psess.edition;
 
     // the first name in this list is the crate name of the crate with the prelude
     let names: &[Symbol] = if attr::contains_name(pre_configured_attrs, sym::no_core) {

compiler/rustc_builtin_macros/src/test_harness.rs

@@ -159,7 +159,7 @@ struct InnerItemLinter<'a> {
 impl<'a> Visitor<'a> for InnerItemLinter<'_> {
     fn visit_item(&mut self, i: &'a ast::Item) {
         if let Some(attr) = attr::find_by_name(&i.attrs, sym::rustc_test_marker) {
-            self.sess.parse_sess.buffer_lint(
+            self.sess.psess.buffer_lint(
                 UNNAMEABLE_TEST_ITEMS,
                 attr.span,
                 i.id,
@@ -200,7 +200,7 @@ impl<'a> MutVisitor for EntryPointCleaner<'a> {
             EntryPointType::MainNamed | EntryPointType::RustcMainAttr | EntryPointType::Start => {
                 item.map(|ast::Item { id, ident, attrs, kind, vis, span, tokens }| {
                     let allow_dead_code = attr::mk_attr_nested_word(
-                        &self.sess.parse_sess.attr_id_generator,
+                        &self.sess.psess.attr_id_generator,
                         ast::AttrStyle::Outer,
                         sym::allow,
                         sym::dead_code,

compiler/rustc_builtin_macros/src/util.rs

@@ -9,7 +9,7 @@ pub fn check_builtin_macro_attribute(ecx: &ExtCtxt<'_>, meta_item: &MetaItem, na
     // All the built-in macro attributes are "words" at the moment.
     let template = AttributeTemplate { word: true, ..Default::default() };
     validate_attr::check_builtin_meta_item(
-        &ecx.sess.parse_sess,
+        &ecx.sess.psess,
         meta_item,
         AttrStyle::Outer,
         name,
@@ -37,7 +37,7 @@ pub fn warn_on_duplicate_attribute(ecx: &ExtCtxt<'_>, item: &Annotatable, name:
     };
     if let Some(attrs) = attrs {
         if let Some(attr) = attr::find_by_name(attrs, name) {
-            ecx.parse_sess().buffer_lint(
+            ecx.psess().buffer_lint(
                 DUPLICATE_MACRO_ATTRIBUTES,
                 attr.span,
                 ecx.current_expansion.lint_node_id,

compiler/rustc_codegen_ssa/src/assert_module_sources.rs

@@ -176,7 +176,7 @@ impl<'tcx> AssertModuleSource<'tcx> {
     /// Scan for a `cfg="foo"` attribute and check whether we have a
     /// cfg flag called `foo`.
     fn check_config(&self, attr: &ast::Attribute) -> bool {
-        let config = &self.tcx.sess.parse_sess.config;
+        let config = &self.tcx.sess.psess.config;
         let value = self.field(attr, sym::cfg);
         debug!("check_config(config={:?}, value={:?})", config, value);
         if config.iter().any(|&(name, _)| name == value) {

compiler/rustc_driver_impl/src/lib.rs

@@ -314,7 +314,7 @@ fn run_compiler(
         file_loader,
         locale_resources: DEFAULT_LOCALE_RESOURCES,
         lint_caps: Default::default(),
-        parse_sess_created: None,
+        psess_created: None,
         hash_untracked_state: None,
         register_lints: None,
         override_queries: None,
@@ -768,7 +768,7 @@ fn print_crate_info(
             }
             Cfg => {
                 let mut cfgs = sess
-                    .parse_sess
+                    .psess
                     .config
                     .iter()
                     .filter_map(|&(name, value)| {
@@ -1215,12 +1215,10 @@ pub fn handle_options(early_dcx: &EarlyDiagCtxt, args: &[String]) -> Option<geto
 
 fn parse_crate_attrs<'a>(sess: &'a Session) -> PResult<'a, ast::AttrVec> {
     match &sess.io.input {
-        Input::File(ifile) => rustc_parse::parse_crate_attrs_from_file(ifile, &sess.parse_sess),
-        Input::Str { name, input } => rustc_parse::parse_crate_attrs_from_source_str(
-            name.clone(),
-            input.clone(),
-            &sess.parse_sess,
-        ),
+        Input::File(ifile) => rustc_parse::parse_crate_attrs_from_file(ifile, &sess.psess),
+        Input::Str { name, input } => {
+            rustc_parse::parse_crate_attrs_from_source_str(name.clone(), input.clone(), &sess.psess)
+        }
     }
 }
 

compiler/rustc_driver_impl/src/pretty.rs

@@ -260,7 +260,7 @@ pub fn print<'tcx>(sess: &Session, ppm: PpMode, ex: PrintExtra<'tcx>) {
                 ExpandedIdentified => Box::new(AstIdentifiedAnn),
                 ExpandedHygiene => Box::new(AstHygieneAnn { sess }),
             };
-            let parse = &sess.parse_sess;
+            let psess = &sess.psess;
             let is_expanded = ppm.needs_ast_map();
             ex.with_krate(|krate| {
                 pprust_ast::print_crate(
@@ -270,8 +270,8 @@ pub fn print<'tcx>(sess: &Session, ppm: PpMode, ex: PrintExtra<'tcx>) {
                     src,
                     &*annotation,
                     is_expanded,
-                    parse.edition,
-                    &sess.parse_sess.attr_id_generator,
+                    psess.edition,
+                    &sess.psess.attr_id_generator,
                 )
             })
         }