Rollup of 8 pull requests

compiler/rustc_const_eval/src/interpret/intrinsics/type_name.rs

@@ -4,7 +4,7 @@ use rustc_hir::definitions::DisambiguatedDefPathData;
 use rustc_middle::mir::interpret::{Allocation, ConstAllocation};
 use rustc_middle::ty::{
     self,
-    print::{with_no_verbose_constants, PrettyPrinter, Print, Printer},
+    print::{PrettyPrinter, Print, Printer},
     subst::{GenericArg, GenericArgKind},
     Ty, TyCtxt,
 };
@@ -179,6 +179,11 @@ impl<'tcx> PrettyPrinter<'tcx> for AbsolutePathPrinter<'tcx> {
 
         Ok(self)
     }
+
+    fn should_print_verbose(&self) -> bool {
+        // `std::any::type_name` should never print verbose type names
+        false
+    }
 }
 
 impl Write for AbsolutePathPrinter<'_> {
@@ -190,9 +195,7 @@ impl Write for AbsolutePathPrinter<'_> {
 
 /// Directly returns an `Allocation` containing an absolute path representation of the given type.
 pub(crate) fn alloc_type_name<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> ConstAllocation<'tcx> {
-    let path = with_no_verbose_constants!(
-        AbsolutePathPrinter { tcx, path: String::new() }.print_type(ty).unwrap().path
-    );
+    let path = AbsolutePathPrinter { tcx, path: String::new() }.print_type(ty).unwrap().path;
     let alloc = Allocation::from_bytes_byte_aligned_immutable(path.into_bytes());
     tcx.intern_const_alloc(alloc)
 }

compiler/rustc_feature/src/active.rs

@@ -388,6 +388,9 @@ declare_features! (
     (active, exclusive_range_pattern, "1.11.0", Some(37854), None),
     /// Allows exhaustive pattern matching on types that contain uninhabited types.
     (active, exhaustive_patterns, "1.13.0", Some(51085), None),
+    /// Allows using `efiapi`, `sysv64` and `win64` as calling convention
+    /// for functions with varargs.
+    (active, extended_varargs_abi_support, "1.65.0", Some(100189), None),
     /// Allows defining `extern type`s.
     (active, extern_types, "1.23.0", Some(43467), None),
     /// Allows the use of `#[ffi_const]` on foreign functions.

compiler/rustc_hir_analysis/src/lib.rs

@@ -106,7 +106,7 @@ use rustc_middle::middle;
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_middle::util;
-use rustc_session::config::EntryFnType;
+use rustc_session::{config::EntryFnType, parse::feature_err};
 use rustc_span::{symbol::sym, Span, DUMMY_SP};
 use rustc_target::spec::abi::Abi;
 use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt as _;
@@ -118,20 +118,40 @@ use astconv::AstConv;
 use bounds::Bounds;
 
 fn require_c_abi_if_c_variadic(tcx: TyCtxt<'_>, decl: &hir::FnDecl<'_>, abi: Abi, span: Span) {
-    match (decl.c_variadic, abi) {
-        // The function has the correct calling convention, or isn't a "C-variadic" function.
-        (false, _) | (true, Abi::C { .. }) | (true, Abi::Cdecl { .. }) => {}
-        // The function is a "C-variadic" function with an incorrect calling convention.
-        (true, _) => {
-            let mut err = struct_span_err!(
-                tcx.sess,
+    const ERROR_HEAD: &str = "C-variadic function must have a compatible calling convention";
+    const CONVENTIONS_UNSTABLE: &str = "`C`, `cdecl`, `win64`, `sysv64` or `efiapi`";
+    const CONVENTIONS_STABLE: &str = "`C` or `cdecl`";
+    const UNSTABLE_EXPLAIN: &str =
+        "using calling conventions other than `C` or `cdecl` for varargs functions is unstable";
+
+    if !decl.c_variadic || matches!(abi, Abi::C { .. } | Abi::Cdecl { .. }) {
+        return;
+    }
+
+    let extended_abi_support = tcx.features().extended_varargs_abi_support;
+    let conventions = match (extended_abi_support, abi.supports_varargs()) {
+        // User enabled additional ABI support for varargs and function ABI matches those ones.
+        (true, true) => return,
+
+        // Using this ABI would be ok, if the feature for additional ABI support was enabled.
+        // Return CONVENTIONS_STABLE, because we want the other error to look the same.
+        (false, true) => {
+            feature_err(
+                &tcx.sess.parse_sess,
+                sym::extended_varargs_abi_support,
                 span,
-                E0045,
-                "C-variadic function must have C or cdecl calling convention"
-            );
-            err.span_label(span, "C-variadics require C or cdecl calling convention").emit();
+                UNSTABLE_EXPLAIN,
+            )
+            .emit();
+            CONVENTIONS_STABLE
         }
-    }
+
+        (false, false) => CONVENTIONS_STABLE,
+        (true, false) => CONVENTIONS_UNSTABLE,
+    };
+
+    let mut err = struct_span_err!(tcx.sess, span, E0045, "{}, like {}", ERROR_HEAD, conventions);
+    err.span_label(span, ERROR_HEAD).emit();
 }
 
 fn require_same_types<'tcx>(

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -63,7 +63,6 @@ thread_local! {
     static NO_TRIMMED_PATH: Cell<bool> = const { Cell::new(false) };
     static NO_QUERIES: Cell<bool> = const { Cell::new(false) };
     static NO_VISIBLE_PATH: Cell<bool> = const { Cell::new(false) };
-    static NO_VERBOSE_CONSTANTS: Cell<bool> = const { Cell::new(false) };
 }
 
 macro_rules! define_helper {
@@ -118,9 +117,6 @@ define_helper!(
     /// Prevent selection of visible paths. `Display` impl of DefId will prefer
     /// visible (public) reexports of types as paths.
     fn with_no_visible_paths(NoVisibleGuard, NO_VISIBLE_PATH);
-    /// Prevent verbose printing of constants. Verbose printing of constants is
-    /// never desirable in some contexts like `std::any::type_name`.
-    fn with_no_verbose_constants(NoVerboseConstantsGuard, NO_VERBOSE_CONSTANTS);
 );
 
 /// The "region highlights" are used to control region printing during
@@ -600,7 +596,7 @@ pub trait PrettyPrinter<'tcx>:
             }
             ty::FnPtr(ref bare_fn) => p!(print(bare_fn)),
             ty::Infer(infer_ty) => {
-                let verbose = self.tcx().sess.verbose();
+                let verbose = self.should_print_verbose();
                 if let ty::TyVar(ty_vid) = infer_ty {
                     if let Some(name) = self.ty_infer_name(ty_vid) {
                         p!(write("{}", name))
@@ -642,7 +638,7 @@ pub trait PrettyPrinter<'tcx>:
                 p!(print_def_path(def_id, &[]));
             }
             ty::Projection(ref data) => {
-                if !(self.tcx().sess.verbose() || NO_QUERIES.with(|q| q.get()))
+                if !(self.should_print_verbose() || NO_QUERIES.with(|q| q.get()))
                     && self.tcx().def_kind(data.item_def_id) == DefKind::ImplTraitPlaceholder
                 {
                     return self.pretty_print_opaque_impl_type(data.item_def_id, data.substs);
@@ -658,7 +654,7 @@ pub trait PrettyPrinter<'tcx>:
                 // only affect certain debug messages (e.g. messages printed
                 // from `rustc_middle::ty` during the computation of `tcx.predicates_of`),
                 // and should have no effect on any compiler output.
-                if self.tcx().sess.verbose() || NO_QUERIES.with(|q| q.get()) {
+                if self.should_print_verbose() || NO_QUERIES.with(|q| q.get()) {
                     p!(write("Opaque({:?}, {:?})", def_id, substs));
                     return Ok(self);
                 }
@@ -689,7 +685,7 @@ pub trait PrettyPrinter<'tcx>:
                     hir::Movability::Static => p!("static "),
                 }
 
-                if !self.tcx().sess.verbose() {
+                if !self.should_print_verbose() {
                     p!("generator");
                     // FIXME(eddyb) should use `def_span`.
                     if let Some(did) = did.as_local() {
@@ -725,7 +721,7 @@ pub trait PrettyPrinter<'tcx>:
             }
             ty::Closure(did, substs) => {
                 p!(write("["));
-                if !self.tcx().sess.verbose() {
+                if !self.should_print_verbose() {
                     p!(write("closure"));
                     // FIXME(eddyb) should use `def_span`.
                     if let Some(did) = did.as_local() {
@@ -763,7 +759,7 @@ pub trait PrettyPrinter<'tcx>:
             }
             ty::Array(ty, sz) => {
                 p!("[", print(ty), "; ");
-                if !NO_VERBOSE_CONSTANTS.with(|flag| flag.get()) && self.tcx().sess.verbose() {
+                if self.should_print_verbose() {
                     p!(write("{:?}", sz));
                 } else if let ty::ConstKind::Unevaluated(..) = sz.kind() {
                     // Do not try to evaluate unevaluated constants. If we are const evaluating an
@@ -1077,7 +1073,7 @@ pub trait PrettyPrinter<'tcx>:
 
                 // Special-case `Fn(...) -> ...` and re-sugar it.
                 let fn_trait_kind = cx.tcx().fn_trait_kind_from_lang_item(principal.def_id);
-                if !cx.tcx().sess.verbose() && fn_trait_kind.is_some() {
+                if !cx.should_print_verbose() && fn_trait_kind.is_some() {
                     if let ty::Tuple(tys) = principal.substs.type_at(0).kind() {
                         let mut projections = predicates.projection_bounds();
                         if let (Some(proj), None) = (projections.next(), projections.next()) {
@@ -1185,7 +1181,7 @@ pub trait PrettyPrinter<'tcx>:
     ) -> Result<Self::Const, Self::Error> {
         define_scoped_cx!(self);
 
-        if !NO_VERBOSE_CONSTANTS.with(|flag| flag.get()) && self.tcx().sess.verbose() {
+        if self.should_print_verbose() {
             p!(write("Const({:?}: {:?})", ct.kind(), ct.ty()));
             return Ok(self);
         }
@@ -1420,7 +1416,7 @@ pub trait PrettyPrinter<'tcx>:
     ) -> Result<Self::Const, Self::Error> {
         define_scoped_cx!(self);
 
-        if !NO_VERBOSE_CONSTANTS.with(|flag| flag.get()) && self.tcx().sess.verbose() {
+        if self.should_print_verbose() {
             p!(write("ValTree({:?}: ", valtree), print(ty), ")");
             return Ok(self);
         }
@@ -1564,6 +1560,10 @@ pub trait PrettyPrinter<'tcx>:
             Ok(cx)
         })
     }
+
+    fn should_print_verbose(&self) -> bool {
+        self.tcx().sess.verbose()
+    }
 }
 
 // HACK(eddyb) boxed to avoid moving around a large struct by-value.
@@ -1839,7 +1839,7 @@ impl<'tcx> Printer<'tcx> for FmtPrinter<'_, 'tcx> {
             }
         }
 
-        let verbose = self.tcx.sess.verbose();
+        let verbose = self.should_print_verbose();
         disambiguated_data.fmt_maybe_verbose(&mut self, verbose)?;
 
         self.empty_path = false;
@@ -1940,7 +1940,7 @@ impl<'tcx> PrettyPrinter<'tcx> for FmtPrinter<'_, 'tcx> {
             return true;
         }
 
-        if self.tcx.sess.verbose() {
+        if self.should_print_verbose() {
             return true;
         }
 
@@ -2012,7 +2012,7 @@ impl<'tcx> FmtPrinter<'_, 'tcx> {
             return Ok(self);
         }
 
-        if self.tcx.sess.verbose() {
+        if self.should_print_verbose() {
             p!(write("{:?}", region));
             return Ok(self);
         }
@@ -2218,7 +2218,7 @@ impl<'tcx> FmtPrinter<'_, 'tcx> {
         // aren't named. Eventually, we might just want this as the default, but
         // this is not *quite* right and changes the ordering of some output
         // anyways.
-        let (new_value, map) = if self.tcx().sess.verbose() {
+        let (new_value, map) = if self.should_print_verbose() {
             let regions: Vec<_> = value
                 .bound_vars()
                 .into_iter()

compiler/rustc_mir_transform/src/lib.rs

@@ -288,7 +288,7 @@ fn mir_const<'tcx>(
 
     let mut body = tcx.mir_built(def).steal();
 
-    rustc_middle::mir::dump_mir(tcx, None, "mir_map", &0, &body, |_, _| Ok(()));
+    pass_manager::dump_mir_for_phase_change(tcx, &body);
 
     pm::run_passes(
         tcx,

compiler/rustc_mir_transform/src/shim.rs

@@ -845,7 +845,7 @@ pub fn build_adt_ctor(tcx: TyCtxt<'_>, ctor_id: DefId) -> Body<'_> {
         span,
     );
 
-    rustc_middle::mir::dump_mir(tcx, None, "mir_map", &0, &body, |_, _| Ok(()));
+    crate::pass_manager::dump_mir_for_phase_change(tcx, &body);
 
     body
 }

compiler/rustc_span/src/symbol.rs

@@ -694,6 +694,7 @@ symbols! {
         export_name,
         expr,
         extended_key_value_attributes,
+        extended_varargs_abi_support,
         extern_absolute_paths,
         extern_crate_item_prelude,
         extern_crate_self,

compiler/rustc_target/src/spec/abi.rs

@@ -40,6 +40,28 @@ pub enum Abi {
     RustCold,
 }
 
+impl Abi {
+    pub fn supports_varargs(self) -> bool {
+        // * C and Cdecl obviously support varargs.
+        // * C can be based on SysV64 or Win64, so they must support varargs.
+        // * EfiApi is based on Win64 or C, so it also supports it.
+        //
+        // * Stdcall does not, because it would be impossible for the callee to clean
+        //   up the arguments. (callee doesn't know how many arguments are there)
+        // * Same for Fastcall, Vectorcall and Thiscall.
+        // * System can become Stdcall, so is also a no-no.
+        // * Other calling conventions are related to hardware or the compiler itself.
+        match self {
+            Self::C { .. }
+            | Self::Cdecl { .. }
+            | Self::Win64 { .. }
+            | Self::SysV64 { .. }
+            | Self::EfiApi => true,
+            _ => false,
+        }
+    }
+}
+
 #[derive(Copy, Clone)]
 pub struct AbiData {
     abi: Abi,