Auto merge of rust-lang#115354 - matthiaskrgr:rollup-4cotcxz, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - rust-lang#111580 (Don't ICE on layout computation failure)
 - rust-lang#114923 (doc: update lld-flavor ref)
 - rust-lang#115174 (tests: add test for rust-lang#67992)
 - rust-lang#115187 (Add new interface to smir)
 - rust-lang#115300 (Tweaks and improvements on SMIR around generics_of and predicates_of)
 - rust-lang#115340 (some more is_zst that should be is_1zst)

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

Author: bors

Cargo.lock

@@ -4335,8 +4335,11 @@ dependencies = [
 name = "rustc_smir"
 version = "0.0.0"
 dependencies = [
+ "rustc_driver",
  "rustc_hir",
+ "rustc_interface",
  "rustc_middle",
+ "rustc_session",
  "rustc_span",
  "rustc_target",
  "scoped-tls",

compiler/rustc_codegen_cranelift/src/common.rs

@@ -480,7 +480,7 @@ impl<'tcx> LayoutOfHelpers<'tcx> for RevealAllLayoutCx<'tcx> {
         if let LayoutError::SizeOverflow(_) | LayoutError::ReferencesError(_) = err {
             self.0.sess.span_fatal(span, err.to_string())
         } else {
-            span_bug!(span, "failed to get layout for `{}`: {}", ty, err)
+            self.0.sess.span_fatal(span, format!("failed to get layout for `{}`: {}", ty, err))
         }
     }
 }

compiler/rustc_codegen_gcc/src/context.rs

@@ -7,6 +7,7 @@ use rustc_codegen_ssa::traits::{
     BaseTypeMethods,
     MiscMethods,
 };
+use rustc_codegen_ssa::errors as ssa_errors;
 use rustc_data_structures::base_n;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_middle::span_bug;
@@ -479,7 +480,7 @@ impl<'gcc, 'tcx> LayoutOfHelpers<'tcx> for CodegenCx<'gcc, 'tcx> {
         if let LayoutError::SizeOverflow(_) | LayoutError::ReferencesError(_) = err {
             self.sess().emit_fatal(respan(span, err.into_diagnostic()))
         } else {
-            span_bug!(span, "failed to get layout for `{}`: {}", ty, err)
+            self.tcx.sess.emit_fatal(ssa_errors::FailedToGetLayout { span, ty, err })
         }
     }
 }

compiler/rustc_codegen_llvm/src/context.rs

@@ -10,6 +10,7 @@ use crate::value::Value;
 
 use cstr::cstr;
 use rustc_codegen_ssa::base::{wants_msvc_seh, wants_wasm_eh};
+use rustc_codegen_ssa::errors as ssa_errors;
 use rustc_codegen_ssa::traits::*;
 use rustc_data_structures::base_n;
 use rustc_data_structures::fx::FxHashMap;
@@ -1000,7 +1001,7 @@ impl<'tcx> LayoutOfHelpers<'tcx> for CodegenCx<'_, 'tcx> {
         if let LayoutError::SizeOverflow(_) | LayoutError::ReferencesError(_) = err {
             self.sess().emit_fatal(Spanned { span, node: err.into_diagnostic() })
         } else {
-            span_bug!(span, "failed to get layout for `{ty}`: {err:?}")
+            self.tcx.sess.emit_fatal(ssa_errors::FailedToGetLayout { span, ty, err })
         }
     }
 }

compiler/rustc_codegen_ssa/messages.ftl

@@ -35,6 +35,8 @@ codegen_ssa_extract_bundled_libs_parse_archive = failed to parse archive '{$rlib
 codegen_ssa_extract_bundled_libs_read_entry = failed to read entry '{$rlib}': {$error}
 codegen_ssa_extract_bundled_libs_write_file = failed to write file '{$rlib}': {$error}
 
+codegen_ssa_failed_to_get_layout = failed to get layout for {$ty}: {$err}
+
 codegen_ssa_failed_to_write = failed to write {$path}: {$error}
 
 codegen_ssa_ignoring_emit_path = ignoring emit path because multiple .{$extension} files were produced

compiler/rustc_codegen_ssa/src/errors.rs

@@ -7,6 +7,7 @@ use rustc_errors::{
     IntoDiagnosticArg,
 };
 use rustc_macros::Diagnostic;
+use rustc_middle::ty::layout::LayoutError;
 use rustc_middle::ty::Ty;
 use rustc_span::{Span, Symbol};
 use rustc_type_ir::FloatTy;
@@ -1030,6 +1031,15 @@ pub struct TargetFeatureSafeTrait {
     pub def: Span,
 }
 
+#[derive(Diagnostic)]
+#[diag(codegen_ssa_failed_to_get_layout)]
+pub struct FailedToGetLayout<'tcx> {
+    #[primary_span]
+    pub span: Span,
+    pub ty: Ty<'tcx>,
+    pub err: LayoutError<'tcx>,
+}
+
 #[derive(Diagnostic)]
 #[diag(codegen_ssa_error_creating_remark_dir)]
 pub struct ErrorCreatingRemarkDir {

compiler/rustc_hir_analysis/src/coherence/builtin.rs

@@ -195,8 +195,8 @@ fn visit_implementation_of_dispatch_from_dyn(tcx: TyCtxt<'_>, impl_did: LocalDef
                     let ty_b = field.ty(tcx, args_b);
 
                     if let Ok(layout) = tcx.layout_of(param_env.and(ty_a)) {
-                        if layout.is_zst() && layout.align.abi.bytes() == 1 {
-                            // ignore ZST fields with alignment of 1 byte
+                        if layout.is_1zst() {
+                            // ignore 1-ZST fields
                             return false;
                         }
                     }

compiler/rustc_lint/src/types.rs

@@ -804,7 +804,7 @@ pub(crate) fn nonnull_optimization_guaranteed<'tcx>(
     tcx.has_attr(def.did(), sym::rustc_nonnull_optimization_guaranteed)
 }
 
-/// `repr(transparent)` structs can have a single non-ZST field, this function returns that
+/// `repr(transparent)` structs can have a single non-1-ZST field, this function returns that
 /// field.
 pub fn transparent_newtype_field<'a, 'tcx>(
     tcx: TyCtxt<'tcx>,
@@ -813,8 +813,8 @@ pub fn transparent_newtype_field<'a, 'tcx>(
     let param_env = tcx.param_env(variant.def_id);
     variant.fields.iter().find(|field| {
         let field_ty = tcx.type_of(field.did).instantiate_identity();
-        let is_zst = tcx.layout_of(param_env.and(field_ty)).is_ok_and(|layout| layout.is_zst());
-        !is_zst
+        let is_1zst = tcx.layout_of(param_env.and(field_ty)).is_ok_and(|layout| layout.is_1zst());
+        !is_1zst
     })
 }
 

compiler/rustc_middle/src/ty/layout.rs

@@ -4,7 +4,9 @@ use crate::query::TyCtxtAt;
 use crate::ty::normalize_erasing_regions::NormalizationError;
 use crate::ty::{self, ConstKind, ReprOptions, Ty, TyCtxt, TypeVisitableExt};
 use rustc_error_messages::DiagnosticMessage;
-use rustc_errors::{DiagnosticBuilder, Handler, IntoDiagnostic};
+use rustc_errors::{
+    DiagnosticArgValue, DiagnosticBuilder, Handler, IntoDiagnostic, IntoDiagnosticArg,
+};
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_index::IndexVec;
@@ -265,6 +267,12 @@ impl<'tcx> fmt::Display for LayoutError<'tcx> {
     }
 }
 
+impl<'tcx> IntoDiagnosticArg for LayoutError<'tcx> {
+    fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
+        self.to_string().into_diagnostic_arg()
+    }
+}
+
 #[derive(Clone, Copy)]
 pub struct LayoutCx<'tcx, C> {
     pub tcx: C,

compiler/rustc_smir/Cargo.toml

@@ -9,6 +9,9 @@ rustc_hir = { path = "../rustc_hir", optional = true }
 rustc_middle = { path = "../rustc_middle", optional = true }
 rustc_span = { path = "../rustc_span", optional = true }
 rustc_target = { path = "../rustc_target", optional = true }
+rustc_driver = { path = "../rustc_driver", optional = true }
+rustc_interface = { path = "../rustc_interface", optional = true}
+rustc_session = {path = "../rustc_session", optional = true}
 tracing = "0.1"
 scoped-tls = "1.0"
 
@@ -18,4 +21,7 @@ default = [
     "rustc_middle",
     "rustc_span",
     "rustc_target",
+    "rustc_driver",
+    "rustc_interface",
+    "rustc_session",
 ]

compiler/rustc_smir/src/rustc_internal/mod.rs

@@ -4,13 +4,18 @@
 //! until stable MIR is complete.
 
 use std::fmt::Debug;
+use std::ops::Index;
 use std::string::ToString;
 
+use crate::rustc_internal;
 use crate::{
     rustc_smir::Tables,
     stable_mir::{self, with},
 };
+use rustc_driver::{Callbacks, Compilation, RunCompiler};
+use rustc_interface::{interface, Queries};
 use rustc_middle::ty::TyCtxt;
+use rustc_session::EarlyErrorHandler;
 pub use rustc_span::def_id::{CrateNum, DefId};
 
 fn with_tables<R>(mut f: impl FnMut(&mut Tables<'_>) -> R) -> R {
@@ -20,7 +25,7 @@ fn with_tables<R>(mut f: impl FnMut(&mut Tables<'_>) -> R) -> R {
 }
 
 pub fn item_def_id(item: &stable_mir::CrateItem) -> DefId {
-    with_tables(|t| t.item_def_id(item))
+    with_tables(|t| t[item.0])
 }
 
 pub fn crate_item(did: DefId) -> stable_mir::CrateItem {
@@ -67,23 +72,16 @@ pub fn impl_def(did: DefId) -> stable_mir::ty::ImplDef {
     with_tables(|t| t.impl_def(did))
 }
 
-impl<'tcx> Tables<'tcx> {
-    pub fn item_def_id(&self, item: &stable_mir::CrateItem) -> DefId {
-        self.def_ids[item.0]
-    }
+impl<'tcx> Index<stable_mir::DefId> for Tables<'tcx> {
+    type Output = DefId;
 
-    pub fn trait_def_id(&self, trait_def: &stable_mir::ty::TraitDef) -> DefId {
-        self.def_ids[trait_def.0]
-    }
-
-    pub fn impl_trait_def_id(&self, impl_def: &stable_mir::ty::ImplDef) -> DefId {
-        self.def_ids[impl_def.0]
-    }
-
-    pub fn generic_def_id(&self, generic_def: &stable_mir::ty::GenericDef) -> DefId {
-        self.def_ids[generic_def.0]
+    #[inline(always)]
+    fn index(&self, index: stable_mir::DefId) -> &Self::Output {
+        &self.def_ids[index.0]
     }
+}
 
+impl<'tcx> Tables<'tcx> {
     pub fn crate_item(&mut self, did: DefId) -> stable_mir::CrateItem {
         stable_mir::CrateItem(self.create_def_id(did))
     }
@@ -140,12 +138,12 @@ impl<'tcx> Tables<'tcx> {
         // FIXME: this becomes inefficient when we have too many ids
         for (i, &d) in self.def_ids.iter().enumerate() {
             if d == did {
-                return i;
+                return stable_mir::DefId(i);
             }
         }
         let id = self.def_ids.len();
         self.def_ids.push(did);
-        id
+        stable_mir::DefId(id)
     }
 }
 
@@ -163,3 +161,40 @@ pub type Opaque = impl Debug + ToString + Clone;
 pub(crate) fn opaque<T: Debug>(value: &T) -> Opaque {
     format!("{value:?}")
 }
+
+pub struct StableMir {
+    args: Vec<String>,
+    callback: fn(TyCtxt<'_>),
+}
+
+impl StableMir {
+    /// Creates a new `StableMir` instance, with given test_function and arguments.
+    pub fn new(args: Vec<String>, callback: fn(TyCtxt<'_>)) -> Self {
+        StableMir { args, callback }
+    }
+
+    /// Runs the compiler against given target and tests it with `test_function`
+    pub fn run(&mut self) {
+        rustc_driver::catch_fatal_errors(|| {
+            RunCompiler::new(&self.args.clone(), self).run().unwrap();
+        })
+        .unwrap();
+    }
+}
+
+impl Callbacks for StableMir {
+    /// Called after analysis. Return value instructs the compiler whether to
+    /// continue the compilation afterwards (defaults to `Compilation::Continue`)
+    fn after_analysis<'tcx>(
+        &mut self,
+        _handler: &EarlyErrorHandler,
+        _compiler: &interface::Compiler,
+        queries: &'tcx Queries<'tcx>,
+    ) -> Compilation {
+        queries.global_ctxt().unwrap().enter(|tcx| {
+            rustc_internal::run(tcx, || (self.callback)(tcx));
+        });
+        // No need to keep going.
+        Compilation::Stop
+    }
+}

compiler/rustc_smir/src/rustc_smir/mod.rs

@@ -10,8 +10,8 @@
 use crate::rustc_internal::{self, opaque};
 use crate::stable_mir::mir::{CopyNonOverlapping, UserTypeProjection, VariantIdx};
 use crate::stable_mir::ty::{
-    allocation_filter, new_allocation, Const, FloatTy, GenericDef, GenericParamDef, IntTy,
-    Movability, RigidTy, TyKind, UintTy,
+    allocation_filter, new_allocation, Const, FloatTy, GenericParamDef, IntTy, Movability, RigidTy,
+    TyKind, UintTy,
 };
 use crate::stable_mir::{self, Context};
 use rustc_hir as hir;
@@ -54,7 +54,7 @@ impl<'tcx> Context for Tables<'tcx> {
     }
 
     fn trait_decl(&mut self, trait_def: &stable_mir::ty::TraitDef) -> stable_mir::ty::TraitDecl {
-        let def_id = self.trait_def_id(trait_def);
+        let def_id = self[trait_def.0];
         let trait_def = self.tcx.trait_def(def_id);
         trait_def.stable(self)
     }
@@ -68,13 +68,13 @@ impl<'tcx> Context for Tables<'tcx> {
     }
 
     fn trait_impl(&mut self, impl_def: &stable_mir::ty::ImplDef) -> stable_mir::ty::ImplTrait {
-        let def_id = self.impl_trait_def_id(impl_def);
+        let def_id = self[impl_def.0];
         let impl_trait = self.tcx.impl_trait_ref(def_id).unwrap();
         impl_trait.stable(self)
     }
 
     fn mir_body(&mut self, item: &stable_mir::CrateItem) -> stable_mir::mir::Body {
-        let def_id = self.item_def_id(item);
+        let def_id = self[item.0];
         let mir = self.tcx.optimized_mir(def_id);
         stable_mir::mir::Body {
             blocks: mir
@@ -102,19 +102,16 @@ impl<'tcx> Context for Tables<'tcx> {
         ty.stable(self)
     }
 
-    fn generics_of(&mut self, generic_def: &GenericDef) -> stable_mir::ty::Generics {
-        let def_id = self.generic_def_id(generic_def);
-        let generic_def = self.tcx.generics_of(def_id);
-        generic_def.stable(self)
+    fn generics_of(&mut self, def_id: stable_mir::DefId) -> stable_mir::ty::Generics {
+        let def_id = self[def_id];
+        let generics = self.tcx.generics_of(def_id);
+        generics.stable(self)
     }
 
-    fn predicates_of(
-        &mut self,
-        trait_def: &stable_mir::ty::TraitDef,
-    ) -> stable_mir::GenericPredicates {
-        let trait_def_id = self.trait_def_id(trait_def);
-        let ty::GenericPredicates { parent, predicates } = self.tcx.predicates_of(trait_def_id);
-        stable_mir::GenericPredicates {
+    fn predicates_of(&mut self, def_id: stable_mir::DefId) -> stable_mir::ty::GenericPredicates {
+        let def_id = self[def_id];
+        let ty::GenericPredicates { parent, predicates } = self.tcx.predicates_of(def_id);
+        stable_mir::ty::GenericPredicates {
             parent: parent.map(|did| self.trait_def(did)),
             predicates: predicates
                 .iter()