Auto merge of rust-lang#128268 - matthiaskrgr:rollup-tck33df, r=matth…

…iaskrgr

Rollup of 3 pull requests

Successful merges:

 - rust-lang#128006 (Make `missing_fragment_specifier` an error in edition 2024)
 - rust-lang#128207 (improve error message when `global_asm!` uses `asm!` options)
 - rust-lang#128266 (update `rust.channel` default value documentation)

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

compiler/rustc_ast/src/ast.rs

@@ -2266,6 +2266,11 @@ bitflags::bitflags! {
 }
 
 impl InlineAsmOptions {
+    pub const COUNT: usize = Self::all().bits().count_ones() as usize;
+
+    pub const GLOBAL_OPTIONS: Self = Self::ATT_SYNTAX.union(Self::RAW);
+    pub const NAKED_OPTIONS: Self = Self::ATT_SYNTAX.union(Self::RAW).union(Self::NORETURN);
+
     pub fn human_readable_names(&self) -> Vec<&'static str> {
         let mut options = vec![];
 

compiler/rustc_builtin_macros/messages.ftl

@@ -199,6 +199,10 @@ builtin_macros_format_use_positional = consider using a positional formatting ar
 
 builtin_macros_global_asm_clobber_abi = `clobber_abi` cannot be used with `global_asm!`
 
+builtin_macros_global_asm_unsupported_option = the `{$symbol}` option cannot be used with `global_asm!`
+    .label = the `{$symbol}` option is not meaningful for global-scoped inline assembly
+    .suggestion = remove this option
+
 builtin_macros_invalid_crate_attribute = invalid crate attribute
 
 builtin_macros_multiple_default_attrs = multiple `#[default]` attributes

compiler/rustc_builtin_macros/src/asm.rs

@@ -310,6 +310,16 @@ fn err_duplicate_option(p: &Parser<'_>, symbol: Symbol, span: Span) {
     p.dcx().emit_err(errors::AsmOptAlreadyprovided { span, symbol, full_span });
 }
 
+/// Report an invalid option error.
+///
+/// This function must be called immediately after the option token is parsed.
+/// Otherwise, the suggestion will be incorrect.
+fn err_unsupported_option(p: &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.dcx().emit_err(errors::GlobalAsmUnsupportedOption { span, symbol, full_span });
+}
+
 /// Try to set the provided option in the provided `AsmArgs`.
 /// If it is already set, report a duplicate option error.
 ///
@@ -318,13 +328,16 @@ fn err_duplicate_option(p: &Parser<'_>, symbol: Symbol, span: Span) {
 fn try_set_option<'a>(
     p: &Parser<'a>,
     args: &mut AsmArgs,
+    is_global_asm: bool,
     symbol: Symbol,
     option: ast::InlineAsmOptions,
 ) {
-    if !args.options.contains(option) {
-        args.options |= option;
-    } else {
+    if is_global_asm && !ast::InlineAsmOptions::GLOBAL_OPTIONS.contains(option) {
+        err_unsupported_option(p, symbol, p.prev_token.span);
+    } else if args.options.contains(option) {
         err_duplicate_option(p, symbol, p.prev_token.span);
+    } else {
+        args.options |= option;
     }
 }
 
@@ -338,25 +351,33 @@ fn parse_options<'a>(
     p.expect(&token::OpenDelim(Delimiter::Parenthesis))?;
 
     while !p.eat(&token::CloseDelim(Delimiter::Parenthesis)) {
-        if !is_global_asm && p.eat_keyword(sym::pure) {
-            try_set_option(p, args, sym::pure, ast::InlineAsmOptions::PURE);
-        } else if !is_global_asm && p.eat_keyword(sym::nomem) {
-            try_set_option(p, args, sym::nomem, ast::InlineAsmOptions::NOMEM);
-        } else if !is_global_asm && p.eat_keyword(sym::readonly) {
-            try_set_option(p, args, sym::readonly, ast::InlineAsmOptions::READONLY);
-        } else if !is_global_asm && p.eat_keyword(sym::preserves_flags) {
-            try_set_option(p, args, sym::preserves_flags, ast::InlineAsmOptions::PRESERVES_FLAGS);
-        } else if !is_global_asm && p.eat_keyword(sym::noreturn) {
-            try_set_option(p, args, sym::noreturn, ast::InlineAsmOptions::NORETURN);
-        } else if !is_global_asm && p.eat_keyword(sym::nostack) {
-            try_set_option(p, args, sym::nostack, ast::InlineAsmOptions::NOSTACK);
-        } else if !is_global_asm && p.eat_keyword(sym::may_unwind) {
-            try_set_option(p, args, kw::Raw, ast::InlineAsmOptions::MAY_UNWIND);
-        } else if p.eat_keyword(sym::att_syntax) {
-            try_set_option(p, args, sym::att_syntax, ast::InlineAsmOptions::ATT_SYNTAX);
-        } else if p.eat_keyword(kw::Raw) {
-            try_set_option(p, args, kw::Raw, ast::InlineAsmOptions::RAW);
-        } else {
+        const OPTIONS: [(Symbol, ast::InlineAsmOptions); ast::InlineAsmOptions::COUNT] = [
+            (sym::pure, ast::InlineAsmOptions::PURE),
+            (sym::nomem, ast::InlineAsmOptions::NOMEM),
+            (sym::readonly, ast::InlineAsmOptions::READONLY),
+            (sym::preserves_flags, ast::InlineAsmOptions::PRESERVES_FLAGS),
+            (sym::noreturn, ast::InlineAsmOptions::NORETURN),
+            (sym::nostack, ast::InlineAsmOptions::NOSTACK),
+            (sym::may_unwind, ast::InlineAsmOptions::MAY_UNWIND),
+            (sym::att_syntax, ast::InlineAsmOptions::ATT_SYNTAX),
+            (kw::Raw, ast::InlineAsmOptions::RAW),
+        ];
+
+        'blk: {
+            for (symbol, option) in OPTIONS {
+                let kw_matched =
+                    if !is_global_asm || ast::InlineAsmOptions::GLOBAL_OPTIONS.contains(option) {
+                        p.eat_keyword(symbol)
+                    } else {
+                        p.eat_keyword_noexpect(symbol)
+                    };
+
+                if kw_matched {
+                    try_set_option(p, args, is_global_asm, symbol, option);
+                    break 'blk;
+                }
+            }
+
             return p.unexpected();
         }
 

compiler/rustc_builtin_macros/src/errors.rs

@@ -845,6 +845,17 @@ pub(crate) struct AsmOptAlreadyprovided {
     pub(crate) full_span: Span,
 }
 
+#[derive(Diagnostic)]
+#[diag(builtin_macros_global_asm_unsupported_option)]
+pub(crate) struct GlobalAsmUnsupportedOption {
+    #[primary_span]
+    #[label]
+    pub(crate) span: Span,
+    pub(crate) symbol: Symbol,
+    #[suggestion(code = "", applicability = "machine-applicable", style = "tool-only")]
+    pub(crate) full_span: Span,
+}
+
 #[derive(Diagnostic)]
 #[diag(builtin_macros_test_runner_invalid)]
 pub(crate) struct TestRunnerInvalid {

compiler/rustc_expand/messages.ftl

@@ -105,6 +105,11 @@ expand_meta_var_dif_seq_matchers = {$msg}
 expand_meta_var_expr_unrecognized_var =
     variable `{$key}` is not recognized in meta-variable expression
 
+expand_missing_fragment_specifier = missing fragment specifier
+    .note = fragment specifiers must be specified in the 2024 edition
+    .suggestion_add_fragspec = try adding a specifier here
+    .valid = {$valid}
+
 expand_module_circular =
     circular modules: {$modules}
 

compiler/rustc_expand/src/errors.rs

@@ -416,6 +416,23 @@ pub struct DuplicateMatcherBinding {
     pub prev: Span,
 }
 
+#[derive(Diagnostic)]
+#[diag(expand_missing_fragment_specifier)]
+#[note]
+#[help(expand_valid)]
+pub struct MissingFragmentSpecifier {
+    #[primary_span]
+    pub span: Span,
+    #[suggestion(
+        expand_suggestion_add_fragspec,
+        style = "verbose",
+        code = ":spec",
+        applicability = "maybe-incorrect"
+    )]
+    pub add_span: Span,
+    pub valid: &'static str,
+}
+
 #[derive(Diagnostic)]
 #[diag(expand_invalid_fragment_specifier)]
 #[help]

compiler/rustc_expand/src/mbe/macro_check.rs

@@ -115,13 +115,16 @@ use rustc_errors::MultiSpan;
 use rustc_lint_defs::BuiltinLintDiag;
 use rustc_session::lint::builtin::{META_VARIABLE_MISUSE, MISSING_FRAGMENT_SPECIFIER};
 use rustc_session::parse::ParseSess;
+use rustc_span::edition::Edition;
 use rustc_span::symbol::kw;
 use rustc_span::{symbol::MacroRulesNormalizedIdent, ErrorGuaranteed, Span};
 
 use smallvec::SmallVec;
 
 use std::iter;
 
+use super::quoted::VALID_FRAGMENT_NAMES_MSG_2021;
+
 /// Stack represented as linked list.
 ///
 /// Those are used for environments because they grow incrementally and are not mutable.
@@ -269,12 +272,20 @@ fn check_binders(
                 // FIXME: Report this as a hard error eventually and remove equivalent errors from
                 // `parse_tt_inner` and `nameize`. Until then the error may be reported twice, once
                 // as a hard error and then once as a buffered lint.
-                psess.buffer_lint(
-                    MISSING_FRAGMENT_SPECIFIER,
-                    span,
-                    node_id,
-                    BuiltinLintDiag::MissingFragmentSpecifier,
-                );
+                if span.edition() >= Edition::Edition2024 {
+                    psess.dcx().emit_err(errors::MissingFragmentSpecifier {
+                        span,
+                        add_span: span.shrink_to_hi(),
+                        valid: VALID_FRAGMENT_NAMES_MSG_2021,
+                    });
+                } else {
+                    psess.buffer_lint(
+                        MISSING_FRAGMENT_SPECIFIER,
+                        span,
+                        node_id,
+                        BuiltinLintDiag::MissingFragmentSpecifier,
+                    );
+                }
             }
             if !macros.is_empty() {
                 psess.dcx().span_bug(span, "unexpected MetaVarDecl in nested lhs");

compiler/rustc_expand/src/mbe/quoted.rs

@@ -16,7 +16,7 @@ use rustc_span::Span;
 const VALID_FRAGMENT_NAMES_MSG: &str = "valid fragment specifiers are \
                                         `ident`, `block`, `stmt`, `expr`, `pat`, `ty`, `lifetime`, \
                                         `literal`, `path`, `meta`, `tt`, `item` and `vis`";
-const VALID_FRAGMENT_NAMES_MSG_2021: &str = "valid fragment specifiers are \
+pub const VALID_FRAGMENT_NAMES_MSG_2021: &str = "valid fragment specifiers are \
                                              `ident`, `block`, `stmt`, `expr`, `expr_2021`, `pat`, \
                                              `ty`, `lifetime`, `literal`, `path`, `meta`, `tt`, \
                                              `item` and `vis`";

compiler/rustc_parse/src/parser/mod.rs

@@ -599,7 +599,7 @@ impl<'a> Parser<'a> {
 
     /// If the next token is the given keyword, eats it and returns `true`.
     /// Otherwise, returns `false`. An expectation is also added for diagnostics purposes.
-    // Public for rustfmt usage.
+    // Public for rustc_builtin_macros and rustfmt usage.
     #[inline]
     pub fn eat_keyword(&mut self, kw: Symbol) -> bool {
         if self.check_keyword(kw) {
@@ -631,8 +631,11 @@ impl<'a> Parser<'a> {
         false
     }
 
+    /// If the next token is the given keyword, eats it and returns `true`.
+    /// Otherwise, returns `false`. No expectation is added.
+    // Public for rustc_builtin_macros usage.
     #[inline]
-    fn eat_keyword_noexpect(&mut self, kw: Symbol) -> bool {
+    pub fn eat_keyword_noexpect(&mut self, kw: Symbol) -> bool {
         if self.token.is_keyword(kw) {
             self.bump();
             true

compiler/rustc_passes/src/naked_functions.rs

@@ -244,10 +244,7 @@ impl<'tcx> CheckInlineAssembly<'tcx> {
             self.tcx.dcx().emit_err(NakedFunctionsOperands { unsupported_operands });
         }
 
-        let supported_options =
-            InlineAsmOptions::RAW | InlineAsmOptions::NORETURN | InlineAsmOptions::ATT_SYNTAX;
-        let unsupported_options = asm.options.difference(supported_options);
-
+        let unsupported_options = asm.options.difference(InlineAsmOptions::NAKED_OPTIONS);
         if !unsupported_options.is_empty() {
             self.tcx.dcx().emit_err(NakedFunctionsAsmOptions {
                 span,

config.example.toml

@@ -578,7 +578,10 @@
 # The "channel" for the Rust build to produce. The stable/beta channels only
 # allow using stable features, whereas the nightly and dev channels allow using
 # nightly features
-#channel = "dev"
+#
+# If using tarball sources, default value for `channel` is taken from the `src/ci/channel` file;
+# otherwise, it's "dev".
+#channel = if "is a tarball source" { content of `src/ci/channel` file } else { "dev" }
 
 # A descriptive string to be appended to `rustc --version` output, which is
 # also used in places like debuginfo `DW_AT_producer`. This may be useful for

src/bootstrap/src/utils/change_tracker.rs

@@ -215,4 +215,9 @@ pub const CONFIG_CHANGE_HISTORY: &[ChangeInfo] = &[
         severity: ChangeSeverity::Info,
         summary: "Removed android-ndk r25b support in favor of android-ndk r26d.",
     },
+    ChangeInfo {
+        change_id: 125181,
+        severity: ChangeSeverity::Warning,
+        summary: "For tarball sources, default value for `rust.channel` will be taken from `src/ci/channel` file.",
+    },
 ];

tests/ui/asm/parse-error.rs

@@ -111,11 +111,15 @@ global_asm!("{}", const);
 global_asm!("{}", const(reg) FOO);
 //~^ ERROR expected one of
 global_asm!("", options(FOO));
-//~^ ERROR expected one of
+//~^ ERROR expected one of `)`, `att_syntax`, or `raw`, found `FOO`
+global_asm!("", options(FOO,));
+//~^ ERROR expected one of `)`, `att_syntax`, or `raw`, found `FOO`
 global_asm!("", options(nomem FOO));
-//~^ ERROR expected one of
+//~^ ERROR the `nomem` option cannot be used with `global_asm!`
+//~| ERROR expected one of `)` or `,`, found `FOO`
 global_asm!("", options(nomem, FOO));
-//~^ ERROR expected one of
+//~^ ERROR the `nomem` option cannot be used with `global_asm!`
+//~| ERROR expected one of `)`, `att_syntax`, or `raw`, found `FOO`
 global_asm!("{}", options(), const FOO);
 global_asm!("", clobber_abi(FOO));
 //~^ ERROR expected string literal