Rollup of 8 pull requests

compiler/rustc_codegen_llvm/src/builder.rs

@@ -16,7 +16,6 @@ use rustc_codegen_ssa::mir::place::PlaceRef;
 use rustc_codegen_ssa::traits::*;
 use rustc_data_structures::small_c_str::SmallCStr;
 use rustc_hir::def_id::DefId;
-use rustc_middle::bug;
 use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrs;
 use rustc_middle::ty::layout::{
     FnAbiError, FnAbiOfHelpers, FnAbiRequest, HasTypingEnv, LayoutError, LayoutOfHelpers,
@@ -1458,10 +1457,7 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
 
         match &fn_abi.ret.mode {
             PassMode::Ignore | PassMode::Indirect { .. } => self.ret_void(),
-            PassMode::Direct(_) | PassMode::Pair { .. } => self.ret(call),
-            mode @ PassMode::Cast { .. } => {
-                bug!("Encountered `PassMode::{mode:?}` during codegen")
-            }
+            PassMode::Direct(_) | PassMode::Pair { .. } | PassMode::Cast { .. } => self.ret(call),
         }
     }
 

compiler/rustc_codegen_ssa/src/back/symbol_export.rs

@@ -51,15 +51,7 @@ fn reachable_non_generics_provider(tcx: TyCtxt<'_>, _: LocalCrate) -> DefIdMap<S
         return Default::default();
     }
 
-    // Check to see if this crate is a "special runtime crate". These
-    // crates, implementation details of the standard library, typically
-    // have a bunch of `pub extern` and `#[no_mangle]` functions as the
-    // ABI between them. We don't want their symbols to have a `C`
-    // export level, however, as they're just implementation details.
-    // Down below we'll hardwire all of the symbols to the `Rust` export
-    // level instead.
-    let special_runtime_crate =
-        tcx.is_panic_runtime(LOCAL_CRATE) || tcx.is_compiler_builtins(LOCAL_CRATE);
+    let is_compiler_builtins = tcx.is_compiler_builtins(LOCAL_CRATE);
 
     let mut reachable_non_generics: DefIdMap<_> = tcx
         .reachable_set(())
@@ -104,11 +96,12 @@ fn reachable_non_generics_provider(tcx: TyCtxt<'_>, _: LocalCrate) -> DefIdMap<S
             if tcx.cross_crate_inlinable(def_id) { None } else { Some(def_id) }
         })
         .map(|def_id| {
-            // We won't link right if this symbol is stripped during LTO.
-            let name = tcx.symbol_name(Instance::mono(tcx, def_id.to_def_id())).name;
-            let used = name == "rust_eh_personality";
-
-            let export_level = if special_runtime_crate {
+            let export_level = if is_compiler_builtins {
+                // We don't want to export compiler-builtins symbols from any
+                // dylibs, even rust dylibs. Unlike all other crates it gets
+                // duplicated in every linker invocation and it may otherwise
+                // unintentionally override definitions of these symbols by
+                // libgcc or compiler-rt for C code.
                 SymbolExportLevel::Rust
             } else {
                 symbol_export_level(tcx, def_id.to_def_id())
@@ -131,8 +124,7 @@ fn reachable_non_generics_provider(tcx: TyCtxt<'_>, _: LocalCrate) -> DefIdMap<S
                     SymbolExportKind::Text
                 },
                 used: codegen_attrs.flags.contains(CodegenFnAttrFlags::USED_COMPILER)
-                    || codegen_attrs.flags.contains(CodegenFnAttrFlags::USED_LINKER)
-                    || used,
+                    || codegen_attrs.flags.contains(CodegenFnAttrFlags::USED_LINKER),
                 rustc_std_internal_symbol: codegen_attrs
                     .flags
                     .contains(CodegenFnAttrFlags::RUSTC_STD_INTERNAL_SYMBOL),

compiler/rustc_codegen_ssa/src/mir/block.rs

@@ -1063,7 +1063,17 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                 let return_dest = self.make_return_dest(bx, destination, &fn_abi.ret, &mut llargs);
                 target.map(|target| (return_dest, target))
             }
-            CallKind::Tail => None,
+            CallKind::Tail => {
+                if fn_abi.ret.is_indirect() {
+                    match self.make_return_dest(bx, destination, &fn_abi.ret, &mut llargs) {
+                        ReturnDest::Nothing => {}
+                        _ => bug!(
+                            "tail calls to functions with indirect returns cannot store into a destination"
+                        ),
+                    }
+                }
+                None
+            }
         };
 
         // Split the rust-call tupled arguments off.

compiler/rustc_infer/src/traits/project.rs

@@ -2,6 +2,7 @@
 
 use rustc_data_structures::snapshot_map::{self, SnapshotMapRef, SnapshotMapStorage};
 use rustc_data_structures::undo_log::Rollback;
+use rustc_macros::TypeVisitable;
 use rustc_middle::traits::EvaluationResult;
 use rustc_middle::ty;
 use tracing::{debug, info};
@@ -12,7 +13,7 @@ use crate::infer::snapshot::undo_log::InferCtxtUndoLogs;
 pub(crate) type UndoLog<'tcx> =
     snapshot_map::UndoLog<ProjectionCacheKey<'tcx>, ProjectionCacheEntry<'tcx>>;
 
-#[derive(Clone)]
+#[derive(Clone, TypeVisitable)]
 pub struct MismatchedProjectionTypes<'tcx> {
     pub err: ty::error::TypeError<'tcx>,
 }

compiler/rustc_middle/src/query/mod.rs

@@ -397,7 +397,10 @@ rustc_queries! {
     /// The root query triggering all analysis passes like typeck or borrowck.
     query analysis(key: ()) {
         eval_always
-        desc { "running analysis passes on this crate" }
+        desc { |tcx|
+            "running analysis passes on crate `{}`",
+            tcx.crate_name(LOCAL_CRATE),
+        }
     }
 
     /// This query checks the fulfillment of collected lint expectations.

compiler/rustc_trait_selection/src/error_reporting/traits/mod.rs

@@ -20,7 +20,7 @@ use rustc_infer::traits::{
     PredicateObligation, SelectionError,
 };
 use rustc_middle::ty::print::{PrintTraitRefExt as _, with_no_trimmed_paths};
-use rustc_middle::ty::{self, Ty, TyCtxt};
+use rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitableExt as _};
 use rustc_span::{DesugaringKind, ErrorGuaranteed, ExpnKind, Span};
 use tracing::{info, instrument};
 
@@ -253,7 +253,10 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
 
         for from_expansion in [false, true] {
             for (error, suppressed) in iter::zip(&errors, &is_suppressed) {
-                if !suppressed && error.obligation.cause.span.from_expansion() == from_expansion {
+                if !suppressed
+                    && error.obligation.cause.span.from_expansion() == from_expansion
+                    && !error.references_error()
+                {
                     let guar = self.report_fulfillment_error(error);
                     self.infcx.set_tainted_by_errors(guar);
                     reported = Some(guar);

compiler/rustc_trait_selection/src/traits/mod.rs

@@ -29,6 +29,7 @@ use std::ops::ControlFlow;
 use rustc_errors::ErrorGuaranteed;
 use rustc_hir::def::DefKind;
 pub use rustc_infer::traits::*;
+use rustc_macros::TypeVisitable;
 use rustc_middle::query::Providers;
 use rustc_middle::span_bug;
 use rustc_middle::ty::error::{ExpectedFound, TypeError};
@@ -75,7 +76,7 @@ use crate::infer::{InferCtxt, TyCtxtInferExt};
 use crate::regions::InferCtxtRegionExt;
 use crate::traits::query::evaluate_obligation::InferCtxtExt as _;
 
-#[derive(Debug)]
+#[derive(Debug, TypeVisitable)]
 pub struct FulfillmentError<'tcx> {
     pub obligation: PredicateObligation<'tcx>,
     pub code: FulfillmentErrorCode<'tcx>,
@@ -107,7 +108,7 @@ impl<'tcx> FulfillmentError<'tcx> {
     }
 }
 
-#[derive(Clone)]
+#[derive(Clone, TypeVisitable)]
 pub enum FulfillmentErrorCode<'tcx> {
     /// Inherently impossible to fulfill; this trait is implemented if and only
     /// if it is already implemented.

src/bootstrap/src/core/build_steps/test.rs

@@ -29,6 +29,7 @@ use crate::core::builder::{
 };
 use crate::core::config::TargetSelection;
 use crate::core::config::flags::{Subcommand, get_completion, top_level_help};
+use crate::core::debuggers;
 use crate::utils::build_stamp::{self, BuildStamp};
 use crate::utils::exec::{BootstrapCommand, command};
 use crate::utils::helpers::{
@@ -38,8 +39,6 @@ use crate::utils::helpers::{
 use crate::utils::render_tests::{add_flags_and_try_run_tests, try_run_tests};
 use crate::{CLang, CodegenBackendKind, DocTests, GitRepo, Mode, PathSet, envify};
 
-const ADB_TEST_DIR: &str = "/data/local/tmp/work";
-
 /// Runs `cargo test` on various internal tools used by bootstrap.
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct CrateBootstrap {
@@ -2078,27 +2077,24 @@ Please disable assertions with `rust.debug-assertions = false`.
 
         cmd.arg("--python").arg(builder.python());
 
-        if let Some(ref gdb) = builder.config.gdb {
-            cmd.arg("--gdb").arg(gdb);
-        }
-
-        let lldb_exe = builder.config.lldb.clone().unwrap_or_else(|| PathBuf::from("lldb"));
-        let lldb_version = command(&lldb_exe)
-            .allow_failure()
-            .arg("--version")
-            .run_capture(builder)
-            .stdout_if_ok()
-            .and_then(|v| if v.trim().is_empty() { None } else { Some(v) });
-        if let Some(ref vers) = lldb_version {
-            cmd.arg("--lldb-version").arg(vers);
-            let lldb_python_dir = command(&lldb_exe)
-                .allow_failure()
-                .arg("-P")
-                .run_capture_stdout(builder)
-                .stdout_if_ok()
-                .map(|p| p.lines().next().expect("lldb Python dir not found").to_string());
-            if let Some(ref dir) = lldb_python_dir {
-                cmd.arg("--lldb-python-dir").arg(dir);
+        if mode == "debuginfo" {
+            if let Some(debuggers::Gdb { gdb }) = debuggers::discover_gdb(builder) {
+                cmd.arg("--gdb").arg(gdb);
+            }
+
+            if let Some(debuggers::Android { adb_path, adb_test_dir, android_cross_path }) =
+                debuggers::discover_android(builder, target)
+            {
+                cmd.arg("--adb-path").arg(adb_path);
+                cmd.arg("--adb-test-dir").arg(adb_test_dir);
+                cmd.arg("--android-cross-path").arg(android_cross_path);
+            }
+
+            if let Some(debuggers::Lldb { lldb_version, lldb_python_dir }) =
+                debuggers::discover_lldb(builder)
+            {
+                cmd.arg("--lldb-version").arg(lldb_version);
+                cmd.arg("--lldb-python-dir").arg(lldb_python_dir);
             }
         }
 
@@ -2332,16 +2328,6 @@ Please disable assertions with `rust.debug-assertions = false`.
 
         cmd.env("RUST_TEST_TMPDIR", builder.tempdir());
 
-        cmd.arg("--adb-path").arg("adb");
-        cmd.arg("--adb-test-dir").arg(ADB_TEST_DIR);
-        if target.contains("android") && !builder.config.dry_run() {
-            // Assume that cc for this target comes from the android sysroot
-            cmd.arg("--android-cross-path")
-                .arg(builder.cc(target).parent().unwrap().parent().unwrap());
-        } else {
-            cmd.arg("--android-cross-path").arg("");
-        }
-
         if builder.config.cmd.rustfix_coverage() {
             cmd.arg("--rustfix-coverage");
         }

src/bootstrap/src/core/debuggers/android.rs

@@ -0,0 +1,24 @@
+use std::path::PathBuf;
+
+use crate::core::builder::Builder;
+use crate::core::config::TargetSelection;
+
+pub(crate) struct Android {
+    pub(crate) adb_path: &'static str,
+    pub(crate) adb_test_dir: &'static str,
+    pub(crate) android_cross_path: PathBuf,
+}
+
+pub(crate) fn discover_android(builder: &Builder<'_>, target: TargetSelection) -> Option<Android> {
+    let adb_path = "adb";
+    // See <https://github.com/rust-lang/rust/pull/102755>.
+    let adb_test_dir = "/data/local/tmp/work";
+
+    let android_cross_path = if target.contains("android") && !builder.config.dry_run() {
+        builder.cc(target).parent().unwrap().parent().unwrap().to_owned()
+    } else {
+        PathBuf::new()
+    };
+
+    Some(Android { adb_path, adb_test_dir, android_cross_path })
+}

src/bootstrap/src/core/debuggers/gdb.rs

@@ -0,0 +1,13 @@
+use std::path::Path;
+
+use crate::core::builder::Builder;
+
+pub(crate) struct Gdb<'a> {
+    pub(crate) gdb: &'a Path,
+}
+
+pub(crate) fn discover_gdb<'a>(builder: &'a Builder<'_>) -> Option<Gdb<'a>> {
+    let gdb = builder.config.gdb.as_deref()?;
+
+    Some(Gdb { gdb })
+}

src/bootstrap/src/core/debuggers/lldb.rs

@@ -0,0 +1,32 @@
+use std::path::PathBuf;
+
+use crate::core::builder::Builder;
+use crate::utils::exec::command;
+
+pub(crate) struct Lldb {
+    pub(crate) lldb_version: String,
+    pub(crate) lldb_python_dir: String,
+}
+
+pub(crate) fn discover_lldb(builder: &Builder<'_>) -> Option<Lldb> {
+    // FIXME(#148361): We probably should not be picking up whatever arbitrary
+    // lldb happens to be in the user's path, and instead require some kind of
+    // explicit opt-in or configuration.
+    let lldb_exe = builder.config.lldb.clone().unwrap_or_else(|| PathBuf::from("lldb"));
+
+    let lldb_version = command(&lldb_exe)
+        .allow_failure()
+        .arg("--version")
+        .run_capture(builder)
+        .stdout_if_ok()
+        .and_then(|v| if v.trim().is_empty() { None } else { Some(v) })?;
+
+    let lldb_python_dir = command(&lldb_exe)
+        .allow_failure()
+        .arg("-P")
+        .run_capture_stdout(builder)
+        .stdout_if_ok()
+        .map(|p| p.lines().next().expect("lldb Python dir not found").to_string())?;
+
+    Some(Lldb { lldb_version, lldb_python_dir })
+}

src/bootstrap/src/core/debuggers/mod.rs

@@ -0,0 +1,10 @@
+//! Code for discovering debuggers and debugger-related configuration, so that
+//! it can be passed to compiletest when running debuginfo tests.
+
+pub(crate) use self::android::{Android, discover_android};
+pub(crate) use self::gdb::{Gdb, discover_gdb};
+pub(crate) use self::lldb::{Lldb, discover_lldb};
+
+mod android;
+mod gdb;
+mod lldb;

src/bootstrap/src/core/mod.rs

@@ -1,6 +1,7 @@
 pub(crate) mod build_steps;
 pub(crate) mod builder;
 pub(crate) mod config;
+pub(crate) mod debuggers;
 pub(crate) mod download;
 pub(crate) mod metadata;
 pub(crate) mod sanity;

src/doc/rustc/src/platform-support.md

@@ -444,7 +444,7 @@ target | std | host | notes
 `x86_64-uwp-windows-gnu` | ✓ |  |
 [`x86_64-uwp-windows-msvc`](platform-support/uwp-windows-msvc.md) | ✓ |  |
 [`x86_64-win7-windows-gnu`](platform-support/win7-windows-gnu.md) | ✓ |   | 64-bit Windows 7 support
-[`x86_64-win7-windows-msvc`](platform-support/win7-windows-msvc.md) | ✓ |   | 64-bit Windows 7 support
+[`x86_64-win7-windows-msvc`](platform-support/win7-windows-msvc.md) | ✓ | ✓ | 64-bit Windows 7 support
 [`x86_64-wrs-vxworks`](platform-support/vxworks.md) | ✓ |  |
 [`x86_64h-apple-darwin`](platform-support/x86_64h-apple-darwin.md) | ✓ | ✓ | macOS with late-gen Intel (at least Haswell)
 [`xtensa-esp32-espidf`](platform-support/esp-idf.md) | ✓ |  | Xtensa ESP32

src/doc/rustc/src/platform-support/win7-windows-msvc.md

@@ -16,7 +16,8 @@ Target triples:
 
 This target supports all of core, alloc, std and test. This is automatically
 tested every night on private infrastructure hosted by the maintainer. Host
-tools may also work, though those are not currently tested.
+tools may also work, though it is not guaranteed. Last known success built
+version of rustc with host tools (x86_64) is 1.91.0.
 
 Those targets follow Windows calling convention for extern "C".
 

src/tools/compiletest/src/common.rs

@@ -560,7 +560,7 @@ pub struct Config {
     ///
     /// FIXME: take a look at this; this is piggy-backing off of gdb code paths but only for
     /// `arm-linux-androideabi` target.
-    pub android_cross_path: Utf8PathBuf,
+    pub android_cross_path: Option<Utf8PathBuf>,
 
     /// Extra parameter to run adb on `arm-linux-androideabi`.
     ///