Auto merge of #80928 - JohnTitor:rollup-sgerm3j, r=JohnTitor

Rollup of 9 pull requests

Successful merges:

 - #79997 (Emit a reactor for cdylib target on wasi)
 - #79998 (Use correct ABI for wasm32 by default)
 - #80042 (Split a func into cold/hot parts, reducing binary size)
 - #80324 (Explain method-call move errors in loops)
 - #80864 (std/core docs: fix wrong link in PartialEq)
 - #80870 (resolve: Simplify built-in macro table)
 - #80885 (rustdoc: Resolve `&str` as `str`)
 - #80904 (Fix small typo)
 - #80923 (Merge different function exits)

Failed merges:

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

Author: bors

compiler/rustc_builtin_macros/src/lib.rs

@@ -14,10 +14,9 @@ extern crate proc_macro;
 
 use crate::deriving::*;
 
-use rustc_expand::base::{MacroExpanderFn, ResolverExpand, SyntaxExtension, SyntaxExtensionKind};
+use rustc_expand::base::{MacroExpanderFn, ResolverExpand, SyntaxExtensionKind};
 use rustc_expand::proc_macro::BangProcMacro;
-use rustc_span::edition::Edition;
-use rustc_span::symbol::{sym, Ident};
+use rustc_span::symbol::sym;
 
 mod asm;
 mod assert;
@@ -44,13 +43,8 @@ pub mod proc_macro_harness;
 pub mod standard_library_imports;
 pub mod test_harness;
 
-pub fn register_builtin_macros(resolver: &mut dyn ResolverExpand, edition: Edition) {
-    let mut register = |name, kind| {
-        resolver.register_builtin_macro(
-            Ident::with_dummy_span(name),
-            SyntaxExtension::default(kind, edition),
-        )
-    };
+pub fn register_builtin_macros(resolver: &mut dyn ResolverExpand) {
+    let mut register = |name, kind| resolver.register_builtin_macro(name, kind);
     macro register_bang($($name:ident: $f:expr,)*) {
         $(register(sym::$name, SyntaxExtensionKind::LegacyBang(Box::new($f as MacroExpanderFn)));)*
     }

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -1276,6 +1276,7 @@ fn exec_linker(
 
 fn link_output_kind(sess: &Session, crate_type: CrateType) -> LinkOutputKind {
     let kind = match (crate_type, sess.crt_static(Some(crate_type)), sess.relocation_model()) {
+        (CrateType::Executable, _, _) if sess.is_wasi_reactor() => LinkOutputKind::WasiReactorExe,
         (CrateType::Executable, false, RelocModel::Pic) => LinkOutputKind::DynamicPicExe,
         (CrateType::Executable, false, _) => LinkOutputKind::DynamicNoPicExe,
         (CrateType::Executable, true, RelocModel::Pic) => LinkOutputKind::StaticPicExe,

compiler/rustc_codegen_ssa/src/back/linker.rs

@@ -314,6 +314,10 @@ impl<'a> Linker for GccLinker<'a> {
                 self.cmd.arg("-static");
                 self.build_dylib(out_filename);
             }
+            LinkOutputKind::WasiReactorExe => {
+                self.linker_arg("--entry");
+                self.linker_arg("_initialize");
+            }
         }
         // VxWorks compiler driver introduced `--static-crt` flag specifically for rustc,
         // it switches linking for libc and similar system libraries to static without using
@@ -662,6 +666,9 @@ impl<'a> Linker for MsvcLinker<'a> {
                 arg.push(out_filename.with_extension("dll.lib"));
                 self.cmd.arg(arg);
             }
+            LinkOutputKind::WasiReactorExe => {
+                panic!("can't link as reactor on non-wasi target");
+            }
         }
     }
 
@@ -1085,6 +1092,10 @@ impl<'a> Linker for WasmLd<'a> {
             LinkOutputKind::DynamicDylib | LinkOutputKind::StaticDylib => {
                 self.cmd.arg("--no-entry");
             }
+            LinkOutputKind::WasiReactorExe => {
+                self.cmd.arg("--entry");
+                self.cmd.arg("_initialize");
+            }
         }
     }
 

compiler/rustc_expand/src/base.rs

@@ -868,7 +868,7 @@ pub trait ResolverExpand {
 
     fn resolve_dollar_crates(&mut self);
     fn visit_ast_fragment_with_placeholders(&mut self, expn_id: ExpnId, fragment: &AstFragment);
-    fn register_builtin_macro(&mut self, ident: Ident, ext: SyntaxExtension);
+    fn register_builtin_macro(&mut self, name: Symbol, ext: SyntaxExtensionKind);
 
     fn expansion_for_ast_pass(
         &mut self,

compiler/rustc_interface/src/passes.rs

@@ -236,7 +236,7 @@ fn configure_and_expand_inner<'a>(
     pre_expansion_lint(sess, lint_store, &krate);
 
     let mut resolver = Resolver::new(sess, &krate, crate_name, metadata_loader, &resolver_arenas);
-    rustc_builtin_macros::register_builtin_macros(&mut resolver, sess.edition());
+    rustc_builtin_macros::register_builtin_macros(&mut resolver);
 
     krate = sess.time("crate_injection", || {
         let alt_std_name = sess.opts.alt_std_name.as_ref().map(|s| Symbol::intern(s));

compiler/rustc_interface/src/tests.rs

@@ -7,7 +7,7 @@ use rustc_session::config::{build_configuration, build_session_options, to_crate
 use rustc_session::config::{rustc_optgroups, ErrorOutputType, ExternLocation, Options, Passes};
 use rustc_session::config::{CFGuard, ExternEntry, LinkerPluginLto, LtoCli, SwitchWithOptPath};
 use rustc_session::config::{
-    Externs, OutputType, OutputTypes, SanitizerSet, SymbolManglingVersion,
+    Externs, OutputType, OutputTypes, SanitizerSet, SymbolManglingVersion, WasiExecModel,
 };
 use rustc_session::lint::Level;
 use rustc_session::search_paths::SearchPath;
@@ -597,6 +597,7 @@ fn test_debugging_options_tracking_hash() {
     tracked!(unleash_the_miri_inside_of_you, true);
     tracked!(use_ctors_section, Some(true));
     tracked!(verify_llvm_ir, true);
+    tracked!(wasi_exec_model, Some(WasiExecModel::Reactor));
 }
 
 #[test]

compiler/rustc_middle/src/hir/map/mod.rs

@@ -710,15 +710,10 @@ impl<'hir> Map<'hir> {
         let mut scope = id;
         loop {
             scope = self.get_enclosing_scope(scope).unwrap_or(CRATE_HIR_ID);
-            if scope == CRATE_HIR_ID {
-                return CRATE_HIR_ID;
-            }
-            match self.get(scope) {
-                Node::Block(_) => {}
-                _ => break,
+            if scope == CRATE_HIR_ID || !matches!(self.get(scope), Node::Block(_)) {
+                return scope;
             }
         }
-        scope
     }
 
     pub fn get_parent_did(&self, id: HirId) -> LocalDefId {

compiler/rustc_mir/src/borrow_check/diagnostics/conflict_errors.rs

@@ -151,95 +151,88 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
 
                 let move_msg = if move_spans.for_closure() { " into closure" } else { "" };
 
+                let loop_message = if location == move_out.source || move_site.traversed_back_edge {
+                    ", in previous iteration of loop"
+                } else {
+                    ""
+                };
+
                 if location == move_out.source {
-                    err.span_label(
-                        span,
-                        format!(
-                            "value {}moved{} here, in previous iteration of loop",
-                            partially_str, move_msg
-                        ),
-                    );
                     is_loop_move = true;
-                } else if move_site.traversed_back_edge {
-                    err.span_label(
-                        move_span,
-                        format!(
-                            "value {}moved{} here, in previous iteration of loop",
-                            partially_str, move_msg
-                        ),
-                    );
-                } else {
-                    if let UseSpans::FnSelfUse { var_span, fn_call_span, fn_span, kind } =
-                        move_spans
-                    {
-                        let place_name = self
-                            .describe_place(moved_place.as_ref())
-                            .map(|n| format!("`{}`", n))
-                            .unwrap_or_else(|| "value".to_owned());
-                        match kind {
-                            FnSelfUseKind::FnOnceCall => {
+                }
+
+                if let UseSpans::FnSelfUse { var_span, fn_call_span, fn_span, kind } = move_spans {
+                    let place_name = self
+                        .describe_place(moved_place.as_ref())
+                        .map(|n| format!("`{}`", n))
+                        .unwrap_or_else(|| "value".to_owned());
+                    match kind {
+                        FnSelfUseKind::FnOnceCall => {
+                            err.span_label(
+                                fn_call_span,
+                                &format!(
+                                    "{} {}moved due to this call{}",
+                                    place_name, partially_str, loop_message
+                                ),
+                            );
+                            err.span_note(
+                                var_span,
+                                "this value implements `FnOnce`, which causes it to be moved when called",
+                            );
+                        }
+                        FnSelfUseKind::Operator { self_arg } => {
+                            err.span_label(
+                                fn_call_span,
+                                &format!(
+                                    "{} {}moved due to usage in operator{}",
+                                    place_name, partially_str, loop_message
+                                ),
+                            );
+                            if self.fn_self_span_reported.insert(fn_span) {
+                                err.span_note(
+                                    self_arg.span,
+                                    "calling this operator moves the left-hand side",
+                                );
+                            }
+                        }
+                        FnSelfUseKind::Normal { self_arg, implicit_into_iter } => {
+                            if implicit_into_iter {
                                 err.span_label(
                                     fn_call_span,
                                     &format!(
-                                        "{} {}moved due to this call",
-                                        place_name, partially_str
+                                        "{} {}moved due to this implicit call to `.into_iter()`{}",
+                                        place_name, partially_str, loop_message
                                     ),
                                 );
-                                err.span_note(
-                                    var_span,
-                                    "this value implements `FnOnce`, which causes it to be moved when called",
-                                );
-                            }
-                            FnSelfUseKind::Operator { self_arg } => {
+                            } else {
                                 err.span_label(
                                     fn_call_span,
                                     &format!(
-                                        "{} {}moved due to usage in operator",
-                                        place_name, partially_str
+                                        "{} {}moved due to this method call{}",
+                                        place_name, partially_str, loop_message
                                     ),
                                 );
-                                if self.fn_self_span_reported.insert(fn_span) {
-                                    err.span_note(
-                                        self_arg.span,
-                                        "calling this operator moves the left-hand side",
-                                    );
-                                }
                             }
-                            FnSelfUseKind::Normal { self_arg, implicit_into_iter } => {
-                                if implicit_into_iter {
-                                    err.span_label(
-                                        fn_call_span,
-                                        &format!(
-                                            "{} {}moved due to this implicit call to `.into_iter()`",
-                                            place_name, partially_str
-                                        ),
-                                    );
-                                } else {
-                                    err.span_label(
-                                        fn_call_span,
-                                        &format!(
-                                            "{} {}moved due to this method call",
-                                            place_name, partially_str
-                                        ),
-                                    );
-                                }
-                                // Avoid pointing to the same function in multiple different
-                                // error messages
-                                if self.fn_self_span_reported.insert(self_arg.span) {
-                                    err.span_note(
-                                        self_arg.span,
-                                        &format!("this function consumes the receiver `self` by taking ownership of it, which moves {}", place_name)
-                                    );
-                                }
+                            // Avoid pointing to the same function in multiple different
+                            // error messages
+                            if self.fn_self_span_reported.insert(self_arg.span) {
+                                err.span_note(
+                                    self_arg.span,
+                                    &format!("this function takes ownership of the receiver `self`, which moves {}", place_name)
+                                );
                             }
-                            // Deref::deref takes &self, which cannot cause a move
-                            FnSelfUseKind::DerefCoercion { .. } => unreachable!(),
                         }
-                    } else {
-                        err.span_label(
-                            move_span,
-                            format!("value {}moved{} here", partially_str, move_msg),
-                        );
+                        // Deref::deref takes &self, which cannot cause a move
+                        FnSelfUseKind::DerefCoercion { .. } => unreachable!(),
+                    }
+                } else {
+                    err.span_label(
+                        move_span,
+                        format!("value {}moved{} here{}", partially_str, move_msg, loop_message),
+                    );
+                    // If the move error occurs due to a loop, don't show
+                    // another message for the same span
+                    if loop_message.is_empty() {
                         move_spans.var_span_label(
                             &mut err,
                             format!(
@@ -250,6 +243,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                         );
                     }
                 }
+
                 if let UseSpans::PatUse(span) = move_spans {
                     err.span_suggestion_verbose(
                         span.shrink_to_lo(),

compiler/rustc_passes/src/intrinsicck.rs

@@ -78,7 +78,7 @@ impl ExprVisitor<'tcx> {
                 return;
             }
 
-            // Special-case transmutting from `typeof(function)` and
+            // Special-case transmuting from `typeof(function)` and
             // `Option<typeof(function)>` to present a clearer error.
             let from = unpack_option_like(self.tcx, from);
             if let (&ty::FnDef(..), SizeSkeleton::Known(size_to)) = (from.kind(), sk_to) {

compiler/rustc_resolve/src/lib.rs

@@ -33,7 +33,7 @@ use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap};
 use rustc_data_structures::ptr_key::PtrKey;
 use rustc_data_structures::sync::Lrc;
 use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder};
-use rustc_expand::base::SyntaxExtension;
+use rustc_expand::base::{SyntaxExtension, SyntaxExtensionKind};
 use rustc_hir::def::Namespace::*;
 use rustc_hir::def::{self, CtorOf, DefKind, NonMacroAttrKind, PartialRes};
 use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, LocalDefId, CRATE_DEF_INDEX};
@@ -874,7 +874,7 @@ pub struct ExternPreludeEntry<'a> {
 
 /// Used for better errors for E0773
 enum BuiltinMacroState {
-    NotYetSeen(SyntaxExtension),
+    NotYetSeen(SyntaxExtensionKind),
     AlreadySeen(Span),
 }