Auto merge of rust-lang#97388 - Dylan-DPC:rollup-tfuc4tf, r=Dylan-DPC

Rollup of 5 pull requests

Successful merges:

 - rust-lang#95953 (Modify MIR building to drop repeat expressions with length zero)
 - rust-lang#96913 (RFC3239: Implement `cfg(target)` - Part 2)
 - rust-lang#97233 ([RFC 2011] Library code)
 - rust-lang#97370 (Minor improvement on else-no-if diagnostic)
 - rust-lang#97384 (Fix metadata stats.)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

Diff for: compiler/rustc_attr/src/builtin.rs

@@ -454,6 +454,15 @@ pub fn find_crate_name(sess: &Session, attrs: &[Attribute]) -> Option<Symbol> {
     sess.first_attr_value_str_by_name(attrs, sym::crate_name)
 }
 
+#[derive(Clone, Debug)]
+pub struct Condition {
+    pub name: Symbol,
+    pub name_span: Span,
+    pub value: Option<Symbol>,
+    pub value_span: Option<Span>,
+    pub span: Span,
+}
+
 /// Tests if a cfg-pattern matches the cfg set
 pub fn cfg_matches(
     cfg: &ast::MetaItem,
@@ -462,70 +471,42 @@ pub fn cfg_matches(
     features: Option<&Features>,
 ) -> bool {
     eval_condition(cfg, sess, features, &mut |cfg| {
-        try_gate_cfg(cfg, sess, features);
-        let error = |span, msg| {
-            sess.span_diagnostic.span_err(span, msg);
-            true
-        };
-        if cfg.path.segments.len() != 1 {
-            return error(cfg.path.span, "`cfg` predicate key must be an identifier");
-        }
-        match &cfg.kind {
-            MetaItemKind::List(..) => {
-                error(cfg.span, "unexpected parentheses after `cfg` predicate key")
-            }
-            MetaItemKind::NameValue(lit) if !lit.kind.is_str() => {
-                handle_errors(
-                    sess,
-                    lit.span,
-                    AttrError::UnsupportedLiteral(
-                        "literal in `cfg` predicate value must be a string",
-                        lit.kind.is_bytestr(),
-                    ),
+        try_gate_cfg(cfg.name, cfg.span, sess, features);
+        if let Some(names_valid) = &sess.check_config.names_valid {
+            if !names_valid.contains(&cfg.name) {
+                sess.buffer_lint_with_diagnostic(
+                    UNEXPECTED_CFGS,
+                    cfg.span,
+                    lint_node_id,
+                    "unexpected `cfg` condition name",
+                    BuiltinLintDiagnostics::UnexpectedCfg((cfg.name, cfg.name_span), None),
                 );
-                true
             }
-            MetaItemKind::NameValue(..) | MetaItemKind::Word => {
-                let ident = cfg.ident().expect("multi-segment cfg predicate");
-                let name = ident.name;
-                let value = cfg.value_str();
-                if let Some(names_valid) = &sess.check_config.names_valid {
-                    if !names_valid.contains(&name) {
-                        sess.buffer_lint_with_diagnostic(
-                            UNEXPECTED_CFGS,
-                            cfg.span,
-                            lint_node_id,
-                            "unexpected `cfg` condition name",
-                            BuiltinLintDiagnostics::UnexpectedCfg((name, ident.span), None),
-                        );
-                    }
-                }
-                if let Some(value) = value {
-                    if let Some(values) = &sess.check_config.values_valid.get(&name) {
-                        if !values.contains(&value) {
-                            sess.buffer_lint_with_diagnostic(
-                                UNEXPECTED_CFGS,
-                                cfg.span,
-                                lint_node_id,
-                                "unexpected `cfg` condition value",
-                                BuiltinLintDiagnostics::UnexpectedCfg(
-                                    (name, ident.span),
-                                    Some((value, cfg.name_value_literal_span().unwrap())),
-                                ),
-                            );
-                        }
-                    }
+        }
+        if let Some(value) = cfg.value {
+            if let Some(values) = &sess.check_config.values_valid.get(&cfg.name) {
+                if !values.contains(&value) {
+                    sess.buffer_lint_with_diagnostic(
+                        UNEXPECTED_CFGS,
+                        cfg.span,
+                        lint_node_id,
+                        "unexpected `cfg` condition value",
+                        BuiltinLintDiagnostics::UnexpectedCfg(
+                            (cfg.name, cfg.name_span),
+                            cfg.value_span.map(|vs| (value, vs)),
+                        ),
+                    );
                 }
-                sess.config.contains(&(name, value))
             }
         }
+        sess.config.contains(&(cfg.name, cfg.value))
     })
 }
 
-fn try_gate_cfg(cfg: &ast::MetaItem, sess: &ParseSess, features: Option<&Features>) {
-    let gate = find_gated_cfg(|sym| cfg.has_name(sym));
+fn try_gate_cfg(name: Symbol, span: Span, sess: &ParseSess, features: Option<&Features>) {
+    let gate = find_gated_cfg(|sym| sym == name);
     if let (Some(feats), Some(gated_cfg)) = (features, gate) {
-        gate_cfg(&gated_cfg, cfg.span, sess, feats);
+        gate_cfg(&gated_cfg, span, sess, feats);
     }
 }
 
@@ -563,11 +544,11 @@ pub fn eval_condition(
     cfg: &ast::MetaItem,
     sess: &ParseSess,
     features: Option<&Features>,
-    eval: &mut impl FnMut(&ast::MetaItem) -> bool,
+    eval: &mut impl FnMut(Condition) -> bool,
 ) -> bool {
     match cfg.kind {
         ast::MetaItemKind::List(ref mis) if cfg.name_or_empty() == sym::version => {
-            try_gate_cfg(cfg, sess, features);
+            try_gate_cfg(sym::version, cfg.span, sess, features);
             let (min_version, span) = match &mis[..] {
                 [NestedMetaItem::Literal(Lit { kind: LitKind::Str(sym, ..), span, .. })] => {
                     (sym, span)
@@ -649,6 +630,25 @@ pub fn eval_condition(
 
                     !eval_condition(mis[0].meta_item().unwrap(), sess, features, eval)
                 }
+                sym::target => {
+                    if let Some(features) = features && !features.cfg_target_compact {
+                        feature_err(
+                            sess,
+                            sym::cfg_target_compact,
+                            cfg.span,
+                            &"compact `cfg(target(..))` is experimental and subject to change"
+                        ).emit();
+                    }
+
+                    mis.iter().fold(true, |res, mi| {
+                        let mut mi = mi.meta_item().unwrap().clone();
+                        if let [seg, ..] = &mut mi.path.segments[..] {
+                            seg.ident.name = Symbol::intern(&format!("target_{}", seg.ident.name));
+                        }
+
+                        res & eval_condition(&mi, sess, features, eval)
+                    })
+                }
                 _ => {
                     struct_span_err!(
                         sess.span_diagnostic,
@@ -662,7 +662,32 @@ pub fn eval_condition(
                 }
             }
         }
-        ast::MetaItemKind::Word | ast::MetaItemKind::NameValue(..) => eval(cfg),
+        ast::MetaItemKind::Word | MetaItemKind::NameValue(..) if cfg.path.segments.len() != 1 => {
+            sess.span_diagnostic
+                .span_err(cfg.path.span, "`cfg` predicate key must be an identifier");
+            true
+        }
+        MetaItemKind::NameValue(ref lit) if !lit.kind.is_str() => {
+            handle_errors(
+                sess,
+                lit.span,
+                AttrError::UnsupportedLiteral(
+                    "literal in `cfg` predicate value must be a string",
+                    lit.kind.is_bytestr(),
+                ),
+            );
+            true
+        }
+        ast::MetaItemKind::Word | ast::MetaItemKind::NameValue(..) => {
+            let ident = cfg.ident().expect("multi-segment cfg predicate");
+            eval(Condition {
+                name: ident.name,
+                name_span: ident.span,
+                value: cfg.value_str(),
+                value_span: cfg.name_value_literal_span(),
+                span: cfg.span,
+            })
+        }
     }
 }
 

Diff for: compiler/rustc_attr/src/lib.rs

@@ -4,6 +4,7 @@
 //! The goal is to move the definition of `MetaItem` and things that don't need to be in `syntax`
 //! to this crate.
 
+#![feature(let_chains)]
 #![feature(let_else)]
 
 #[macro_use]

Diff for: compiler/rustc_feature/src/active.rs

@@ -319,6 +319,8 @@ declare_features! (
     (active, cfg_sanitize, "1.41.0", Some(39699), None),
     /// Allows `cfg(target_abi = "...")`.
     (active, cfg_target_abi, "1.55.0", Some(80970), None),
+    /// Allows `cfg(target(abi = "..."))`.
+    (active, cfg_target_compact, "1.63.0", Some(96901), None),
     /// Allows `cfg(target_has_atomic_load_store = "...")`.
     (active, cfg_target_has_atomic, "1.60.0", Some(94039), None),
     /// Allows `cfg(target_has_atomic_equal_alignment = "...")`.

Diff for: compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -536,9 +536,11 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
 
     fn encode_crate_root(&mut self) -> LazyValue<CrateRoot> {
         let tcx = self.tcx;
-        let mut i = self.position();
+        let mut i = 0;
+        let preamble_bytes = self.position() - i;
 
         // Encode the crate deps
+        i = self.position();
         let crate_deps = self.encode_crate_deps();
         let dylib_dependency_formats = self.encode_dylib_dependency_formats();
         let dep_bytes = self.position() - i;
@@ -564,7 +566,9 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
         let native_libraries = self.encode_native_libraries();
         let native_lib_bytes = self.position() - i;
 
+        i = self.position();
         let foreign_modules = self.encode_foreign_modules();
+        let foreign_modules_bytes = self.position() - i;
 
         // Encode DefPathTable
         i = self.position();
@@ -584,6 +588,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
         i = self.position();
         let incoherent_impls = self.encode_incoherent_impls();
         let incoherent_impls_bytes = self.position() - i;
+
         // Encode MIR.
         i = self.position();
         self.encode_mir();
@@ -596,6 +601,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
         let item_bytes = self.position() - i;
 
         // Encode the allocation index
+        i = self.position();
         let interpret_alloc_index = {
             let mut interpret_alloc_index = Vec::new();
             let mut n = 0;
@@ -618,6 +624,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
             }
             self.lazy_array(interpret_alloc_index)
         };
+        let interpret_alloc_index_bytes = self.position() - i;
 
         // Encode the proc macro data. This affects 'tables',
         // so we need to do this before we encode the tables
@@ -662,9 +669,9 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
         let source_map = self.encode_source_map();
         let source_map_bytes = self.position() - i;
 
+        i = self.position();
         let attrs = tcx.hir().krate_attrs();
         let has_default_lib_allocator = tcx.sess.contains_name(&attrs, sym::default_lib_allocator);
-
         let root = self.lazy(CrateRoot {
             name: tcx.crate_name(LOCAL_CRATE),
             extra_filename: tcx.sess.opts.cg.extra_filename.clone(),
@@ -707,9 +714,34 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
             expn_hashes,
             def_path_hash_map,
         });
+        let final_bytes = self.position() - i;
 
         let total_bytes = self.position();
 
+        let computed_total_bytes = preamble_bytes
+            + dep_bytes
+            + lib_feature_bytes
+            + lang_item_bytes
+            + diagnostic_item_bytes
+            + native_lib_bytes
+            + foreign_modules_bytes
+            + def_path_table_bytes
+            + traits_bytes
+            + impls_bytes
+            + incoherent_impls_bytes
+            + mir_bytes
+            + item_bytes
+            + interpret_alloc_index_bytes
+            + proc_macro_data_bytes
+            + tables_bytes
+            + debugger_visualizers_bytes
+            + exported_symbols_bytes
+            + hygiene_bytes
+            + def_path_hash_map_bytes
+            + source_map_bytes
+            + final_bytes;
+        assert_eq!(total_bytes, computed_total_bytes);
+
         if tcx.sess.meta_stats() {
             let mut zero_bytes = 0;
             for e in self.opaque.data.iter() {
@@ -718,27 +750,41 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
                 }
             }
 
-            eprintln!("metadata stats:");
-            eprintln!("                  dep bytes: {}", dep_bytes);
-            eprintln!("          lib feature bytes: {}", lib_feature_bytes);
-            eprintln!("            lang item bytes: {}", lang_item_bytes);
-            eprintln!("      diagnostic item bytes: {}", diagnostic_item_bytes);
-            eprintln!("               native bytes: {}", native_lib_bytes);
-            eprintln!(" debugger visualizers bytes: {}", debugger_visualizers_bytes);
-            eprintln!("           source_map bytes: {}", source_map_bytes);
-            eprintln!("               traits bytes: {}", traits_bytes);
-            eprintln!("                impls bytes: {}", impls_bytes);
-            eprintln!("     incoherent_impls bytes: {}", incoherent_impls_bytes);
-            eprintln!("         exp. symbols bytes: {}", exported_symbols_bytes);
-            eprintln!("       def-path table bytes: {}", def_path_table_bytes);
-            eprintln!("      def-path hashes bytes: {}", def_path_hash_map_bytes);
-            eprintln!("      proc-macro-data-bytes: {}", proc_macro_data_bytes);
-            eprintln!("                  mir bytes: {}", mir_bytes);
-            eprintln!("                 item bytes: {}", item_bytes);
-            eprintln!("                table bytes: {}", tables_bytes);
-            eprintln!("              hygiene bytes: {}", hygiene_bytes);
-            eprintln!("                 zero bytes: {}", zero_bytes);
-            eprintln!("                total bytes: {}", total_bytes);
+            let perc = |bytes| (bytes * 100) as f64 / total_bytes as f64;
+            let p = |label, bytes| {
+                eprintln!("{:>21}: {:>8} bytes ({:4.1}%)", label, bytes, perc(bytes));
+            };
+
+            eprintln!("");
+            eprintln!(
+                "{} metadata bytes, of which {} bytes ({:.1}%) are zero",
+                total_bytes,
+                zero_bytes,
+                perc(zero_bytes)
+            );
+            p("preamble", preamble_bytes);
+            p("dep", dep_bytes);
+            p("lib feature", lib_feature_bytes);
+            p("lang item", lang_item_bytes);
+            p("diagnostic item", diagnostic_item_bytes);
+            p("native lib", native_lib_bytes);
+            p("foreign modules", foreign_modules_bytes);
+            p("def-path table", def_path_table_bytes);
+            p("traits", traits_bytes);
+            p("impls", impls_bytes);
+            p("incoherent_impls", incoherent_impls_bytes);
+            p("mir", mir_bytes);
+            p("item", item_bytes);
+            p("interpret_alloc_index", interpret_alloc_index_bytes);
+            p("proc-macro-data", proc_macro_data_bytes);
+            p("tables", tables_bytes);
+            p("debugger visualizers", debugger_visualizers_bytes);
+            p("exported symbols", exported_symbols_bytes);
+            p("hygiene", hygiene_bytes);
+            p("def-path hashes", def_path_hash_map_bytes);
+            p("source_map", source_map_bytes);
+            p("final", final_bytes);
+            eprintln!("");
         }
 
         root