Auto merge of #71951 - Dylan-DPC:rollup-j9v1p0f, r=Dylan-DPC

Rollup of 7 pull requests

Successful merges:

 - #71269 (Define UB in float-to-int casts to saturate)
 - #71591 (use new interface to create threads on HermitCore)
 - #71819 (x.py: Give a more helpful error message if curl isn't installed)
 - #71893 (Use the `impls` module to import pre-existing dataflow analyses)
 - #71929 (Use -fvisibility=hidden for libunwind)
 - #71937 (Ignore SGX on a few ui tests)
 - #71944 (Add comment for `Ord` implementation for array)

Failed merges:

r? @ghost

Author: bors

Diff for: Cargo.lock

@@ -1375,9 +1375,9 @@ dependencies = [
 
 [[package]]
 name = "hermit-abi"
-version = "0.1.10"
+version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "725cf19794cf90aa94e65050cb4191ff5d8fa87a498383774c47b332e3af952e"
+checksum = "61565ff7aaace3525556587bd2dc31d4a07071957be715e63ce7b1eccf51a8f4"
 dependencies = [
  "compiler_builtins",
  "libc",

Diff for: src/bootstrap/bootstrap.py

@@ -79,6 +79,7 @@ def _download(path, url, probably_big, verbose, exception):
             option = "-#"
         else:
             option = "-s"
+        require(["curl", "--version"])
         run(["curl", option,
              "-y", "30", "-Y", "10",    # timeout if speed is < 10 bytes/sec for > 30 seconds
              "--connect-timeout", "30",  # timeout if cannot connect within 30 seconds
@@ -143,6 +144,21 @@ def run(args, verbose=False, exception=False, **kwargs):
         sys.exit(err)
 
 
+def require(cmd, exit=True):
+    '''Run a command, returning its output.
+    On error,
+        If `exit` is `True`, exit the process.
+        Otherwise, return None.'''
+    try:
+        return subprocess.check_output(cmd).strip()
+    except (subprocess.CalledProcessError, OSError) as exc:
+        if not exit:
+            return None
+        print("error: unable to run `{}`: {}".format(' '.join(cmd), exc))
+        print("Please make sure it's installed and in the path.")
+        sys.exit(1)
+
+
 def stage0_data(rust_root):
     """Build a dictionary from stage0.txt"""
     nightlies = os.path.join(rust_root, "src/stage0.txt")
@@ -164,16 +180,12 @@ def format_build_time(duration):
 def default_build_triple():
     """Build triple as in LLVM"""
     default_encoding = sys.getdefaultencoding()
-    try:
-        ostype = subprocess.check_output(
-            ['uname', '-s']).strip().decode(default_encoding)
-        cputype = subprocess.check_output(
-            ['uname', '-m']).strip().decode(default_encoding)
-    except (subprocess.CalledProcessError, OSError):
-        if sys.platform == 'win32':
-            return 'x86_64-pc-windows-msvc'
-        err = "uname not found"
-        sys.exit(err)
+    required = not sys.platform == 'win32'
+    ostype = require(["uname", "-s"], exit=required).decode(default_encoding)
+    cputype = require(['uname', '-m'], exit=required).decode(default_encoding)
+
+    if ostype is None or cputype is None:
+        return 'x86_64-pc-windows-msvc'
 
     # The goal here is to come up with the same triple as LLVM would,
     # at least for the subset of platforms we're willing to target.
@@ -203,12 +215,7 @@ def default_build_triple():
         # output from that option is too generic for our purposes (it will
         # always emit 'i386' on x86/amd64 systems).  As such, isainfo -k
         # must be used instead.
-        try:
-            cputype = subprocess.check_output(
-                ['isainfo', '-k']).strip().decode(default_encoding)
-        except (subprocess.CalledProcessError, OSError):
-            err = "isainfo not found"
-            sys.exit(err)
+        cputype = require(['isainfo', '-k']).decode(default_encoding)
     elif ostype.startswith('MINGW'):
         # msys' `uname` does not print gcc configuration, but prints msys
         # configuration. so we cannot believe `uname -m`:
@@ -766,13 +773,8 @@ def update_submodules(self):
         default_encoding = sys.getdefaultencoding()
 
         # check the existence and version of 'git' command
-        try:
-            git_version_output = subprocess.check_output(['git', '--version'])
-            git_version_str = git_version_output.strip().split()[2].decode(default_encoding)
-            self.git_version = distutils.version.LooseVersion(git_version_str)
-        except (subprocess.CalledProcessError, OSError):
-            print("error: `git` is not found, please make sure it's installed and in the path.")
-            sys.exit(1)
+        git_version_str = require(['git', '--version']).split()[2].decode(default_encoding)
+        self.git_version = distutils.version.LooseVersion(git_version_str)
 
         slow_submodules = self.get_toml('fast-submodules') == "false"
         start_time = time()

Diff for: src/libcore/array/mod.rs

@@ -375,6 +375,7 @@ where
     }
 }
 
+/// Implements comparison of arrays lexicographically.
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: Ord, const N: usize> Ord for [T; N]
 where

Diff for: src/librustc_codegen_ssa/mir/rvalue.rs

@@ -768,7 +768,7 @@ fn cast_float_to_int<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
 ) -> Bx::Value {
     let fptosui_result = if signed { bx.fptosi(x, int_ty) } else { bx.fptoui(x, int_ty) };
 
-    if !bx.cx().sess().opts.debugging_opts.saturating_float_casts {
+    if let Some(false) = bx.cx().sess().opts.debugging_opts.saturating_float_casts {
         return fptosui_result;
     }
 

Diff for: src/librustc_interface/tests.rs

@@ -559,7 +559,7 @@ fn test_debugging_options_tracking_hash() {
     tracked!(sanitizer, Some(Sanitizer::Address));
     tracked!(sanitizer_memory_track_origins, 2);
     tracked!(sanitizer_recover, vec![Sanitizer::Address]);
-    tracked!(saturating_float_casts, true);
+    tracked!(saturating_float_casts, Some(true));
     tracked!(share_generics, Some(true));
     tracked!(show_span, Some(String::from("abc")));
     tracked!(src_hash_algorithm, Some(SourceFileHashAlgorithm::Sha1));

Diff for: src/librustc_mir/borrow_check/mod.rs

@@ -32,13 +32,13 @@ use std::mem;
 use std::rc::Rc;
 
 use crate::dataflow;
+use crate::dataflow::impls::{
+    Borrows, EverInitializedPlaces, MaybeInitializedPlaces, MaybeUninitializedPlaces,
+};
 use crate::dataflow::indexes::{BorrowIndex, InitIndex, MoveOutIndex, MovePathIndex};
 use crate::dataflow::move_paths::{InitLocation, LookupResult, MoveData, MoveError};
-use crate::dataflow::Borrows;
-use crate::dataflow::EverInitializedPlaces;
 use crate::dataflow::MoveDataParamEnv;
 use crate::dataflow::{Analysis, BorrowckFlowState as Flows, BorrowckResults};
-use crate::dataflow::{MaybeInitializedPlaces, MaybeUninitializedPlaces};
 use crate::transform::MirSource;
 
 use self::diagnostics::{AccessKind, RegionName};

Diff for: src/librustc_mir/borrow_check/nll.rs

@@ -21,8 +21,8 @@ use std::str::FromStr;
 use self::mir_util::PassWhere;
 use polonius_engine::{Algorithm, Output};
 
+use crate::dataflow::impls::MaybeInitializedPlaces;
 use crate::dataflow::move_paths::{InitKind, InitLocation, MoveData};
-use crate::dataflow::MaybeInitializedPlaces;
 use crate::dataflow::ResultsCursor;
 use crate::transform::MirSource;
 use crate::util as mir_util;

Diff for: src/librustc_mir/borrow_check/type_check/liveness/mod.rs

@@ -3,8 +3,8 @@ use rustc_middle::mir::{Body, Local};
 use rustc_middle::ty::{RegionVid, TyCtxt};
 use std::rc::Rc;
 
+use crate::dataflow::impls::MaybeInitializedPlaces;
 use crate::dataflow::move_paths::MoveData;
-use crate::dataflow::MaybeInitializedPlaces;
 use crate::dataflow::ResultsCursor;
 
 use crate::borrow_check::{

Diff for: src/librustc_mir/borrow_check/type_check/liveness/trace.rs

@@ -8,9 +8,9 @@ use rustc_trait_selection::traits::query::type_op::outlives::DropckOutlives;
 use rustc_trait_selection::traits::query::type_op::TypeOp;
 use std::rc::Rc;
 
+use crate::dataflow::impls::MaybeInitializedPlaces;
 use crate::dataflow::indexes::MovePathIndex;
 use crate::dataflow::move_paths::{HasMoveData, MoveData};
-use crate::dataflow::MaybeInitializedPlaces;
 use crate::dataflow::ResultsCursor;
 
 use crate::borrow_check::{

Diff for: src/librustc_mir/borrow_check/type_check/mod.rs

@@ -39,8 +39,8 @@ use rustc_trait_selection::traits::query::type_op::custom::CustomTypeOp;
 use rustc_trait_selection::traits::query::{Fallible, NoSolution};
 use rustc_trait_selection::traits::{self, ObligationCause, PredicateObligations};
 
+use crate::dataflow::impls::MaybeInitializedPlaces;
 use crate::dataflow::move_paths::MoveData;
-use crate::dataflow::MaybeInitializedPlaces;
 use crate::dataflow::ResultsCursor;
 use crate::transform::{
     check_consts::ConstCx,

Diff for: src/librustc_mir/dataflow/impls/mod.rs

@@ -21,14 +21,14 @@ use super::on_lookup_result_bits;
 use crate::dataflow::drop_flag_effects;
 
 mod borrowed_locals;
+pub(super) mod borrows;
 mod liveness;
 mod storage_liveness;
 
-pub use self::borrowed_locals::*;
+pub use self::borrowed_locals::{MaybeBorrowedLocals, MaybeMutBorrowedLocals};
+pub use self::borrows::Borrows;
 pub use self::liveness::MaybeLiveLocals;
-pub use self::storage_liveness::*;
-
-pub(super) mod borrows;
+pub use self::storage_liveness::{MaybeRequiresStorage, MaybeStorageLive};
 
 /// `MaybeInitializedPlaces` tracks all places that might be
 /// initialized upon reaching a particular point in the control flow

Diff for: src/librustc_mir/dataflow/mod.rs

@@ -8,17 +8,12 @@ pub use self::framework::{
     BottomValue, Engine, Forward, GenKill, GenKillAnalysis, Results, ResultsCursor,
     ResultsRefCursor, ResultsVisitor,
 };
-pub use self::impls::{
-    borrows::Borrows, DefinitelyInitializedPlaces, EverInitializedPlaces, MaybeBorrowedLocals,
-    MaybeInitializedPlaces, MaybeLiveLocals, MaybeMutBorrowedLocals, MaybeRequiresStorage,
-    MaybeStorageLive, MaybeUninitializedPlaces,
-};
 
 use self::move_paths::MoveData;
 
 pub mod drop_flag_effects;
 mod framework;
-mod impls;
+pub mod impls;
 pub mod move_paths;
 
 pub(crate) mod indexes {

Diff for: src/librustc_mir/transform/check_consts/validation.rs

@@ -20,7 +20,7 @@ use super::qualifs::{self, CustomEq, HasMutInterior, NeedsDrop};
 use super::resolver::FlowSensitiveAnalysis;
 use super::{is_lang_panic_fn, ConstCx, ConstKind, Qualif};
 use crate::const_eval::{is_const_fn, is_unstable_const_fn};
-use crate::dataflow::MaybeMutBorrowedLocals;
+use crate::dataflow::impls::MaybeMutBorrowedLocals;
 use crate::dataflow::{self, Analysis};
 
 // We are using `MaybeMutBorrowedLocals` as a proxy for whether an item may have been mutated

Diff for: src/librustc_mir/transform/elaborate_drops.rs

@@ -1,10 +1,10 @@
 use crate::dataflow;
+use crate::dataflow::impls::{MaybeInitializedPlaces, MaybeUninitializedPlaces};
 use crate::dataflow::move_paths::{LookupResult, MoveData, MovePathIndex};
 use crate::dataflow::on_lookup_result_bits;
 use crate::dataflow::MoveDataParamEnv;
 use crate::dataflow::{on_all_children_bits, on_all_drop_children_bits};
 use crate::dataflow::{Analysis, ResultsCursor};
-use crate::dataflow::{MaybeInitializedPlaces, MaybeUninitializedPlaces};
 use crate::transform::{MirPass, MirSource};
 use crate::util::elaborate_drops::{elaborate_drop, DropFlagState, Unwind};
 use crate::util::elaborate_drops::{DropElaborator, DropFlagMode, DropStyle};

Diff for: src/librustc_mir/transform/generator.rs

@@ -49,10 +49,10 @@
 //! For generators with state 1 (returned) and state 2 (poisoned) it does nothing.
 //! Otherwise it drops all the values in scope at the last suspension point.
 
-use crate::dataflow::{self, Analysis};
-use crate::dataflow::{
+use crate::dataflow::impls::{
     MaybeBorrowedLocals, MaybeLiveLocals, MaybeRequiresStorage, MaybeStorageLive,
 };
+use crate::dataflow::{self, Analysis};
 use crate::transform::no_landing_pads::no_landing_pads;
 use crate::transform::simplify;
 use crate::transform::{MirPass, MirSource};

Diff for: src/librustc_mir/transform/rustc_peek.rs

@@ -9,14 +9,14 @@ use rustc_index::bit_set::BitSet;
 use rustc_middle::mir::{self, Body, Local, Location};
 use rustc_middle::ty::{self, Ty, TyCtxt};
 
+use crate::dataflow::impls::{
+    DefinitelyInitializedPlaces, MaybeInitializedPlaces, MaybeLiveLocals, MaybeMutBorrowedLocals,
+    MaybeUninitializedPlaces,
+};
 use crate::dataflow::move_paths::{HasMoveData, MoveData};
 use crate::dataflow::move_paths::{LookupResult, MovePathIndex};
-use crate::dataflow::MaybeMutBorrowedLocals;
 use crate::dataflow::MoveDataParamEnv;
 use crate::dataflow::{Analysis, Results, ResultsCursor};
-use crate::dataflow::{
-    DefinitelyInitializedPlaces, MaybeInitializedPlaces, MaybeLiveLocals, MaybeUninitializedPlaces,
-};
 
 pub struct SanityCheck;
 

Diff for: src/librustc_session/options.rs

@@ -938,9 +938,9 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
         "enable origins tracking in MemorySanitizer"),
     sanitizer_recover: Vec<Sanitizer> = (vec![], parse_sanitizer_list, [TRACKED],
         "enable recovery for selected sanitizers"),
-    saturating_float_casts: bool = (false, parse_bool, [TRACKED],
+    saturating_float_casts: Option<bool> = (None, parse_opt_bool, [TRACKED],
         "make float->int casts UB-free: numbers outside the integer type's range are clipped to \
-        the max/min integer respectively, and NaN is mapped to 0 (default: no)"),
+        the max/min integer respectively, and NaN is mapped to 0 (default: yes)"),
     save_analysis: bool = (false, parse_bool, [UNTRACKED],
         "write syntax and type analysis (in JSON format) information, in \
         addition to normal output (default: no)"),

Diff for: src/librustc_typeck/check/demand.rs

@@ -909,13 +909,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                             cast_suggestion,
                             Applicability::MaybeIncorrect, // lossy conversion
                         );
-                        err.warn(
-                            "if the rounded value cannot be represented by the target \
-                                integer type, including `Inf` and `NaN`, casting will cause \
-                                undefined behavior \
-                                (see issue #10184 <https://github.com/rust-lang/rust/issues/10184> \
-                                for more information)",
-                        );
                     }
                     true
                 }

Diff for: src/libstd/Cargo.toml

@@ -41,7 +41,7 @@ dlmalloc = { version = "0.1", features = ['rustc-dep-of-std'] }
 fortanix-sgx-abi = { version = "0.3.2", features = ['rustc-dep-of-std'] }
 
 [target.'cfg(all(any(target_arch = "x86_64", target_arch = "aarch64"), target_os = "hermit"))'.dependencies]
-hermit-abi = { version = "0.1.10", features = ['rustc-dep-of-std'] }
+hermit-abi = { version = "0.1.12", features = ['rustc-dep-of-std'] }
 
 [target.wasm32-wasi.dependencies]
 wasi = { version = "0.9.0", features = ['rustc-dep-of-std'], default-features = false }

Diff for: src/libstd/sys/hermit/thread.rs

@@ -16,25 +16,24 @@ pub struct Thread {
 unsafe impl Send for Thread {}
 unsafe impl Sync for Thread {}
 
-pub const DEFAULT_MIN_STACK_SIZE: usize = 262144;
+pub const DEFAULT_MIN_STACK_SIZE: usize = 1 << 20;
 
 impl Thread {
     pub unsafe fn new_with_coreid(
-        _stack: usize,
+        stack: usize,
         p: Box<dyn FnOnce()>,
         core_id: isize,
     ) -> io::Result<Thread> {
         let p = Box::into_raw(box p);
-        let mut tid: Tid = u32::MAX;
-        let ret = abi::spawn(
-            &mut tid as *mut Tid,
+        let tid = abi::spawn2(
             thread_start,
-            &*p as *const _ as *const u8 as usize,
+            p as usize,
             abi::Priority::into(abi::NORMAL_PRIO),
+            stack,
             core_id,
         );
 
-        return if ret != 0 {
+        return if tid == 0 {
             // The thread failed to start and as a result p was not consumed. Therefore, it is
             // safe to reconstruct the box so that it gets deallocated.
             drop(Box::from_raw(p));

Diff for: src/libunwind/build.rs

@@ -89,6 +89,7 @@ mod llvm_libunwind {
             cfg.flag("-fno-rtti");
             cfg.flag("-fstrict-aliasing");
             cfg.flag("-funwind-tables");
+            cfg.flag("-fvisibility=hidden");
         }
 
         let mut unwind_sources = vec![

Diff for: src/test/codegen/unchecked-float-casts.rs

@@ -1,7 +1,7 @@
-// compile-flags: -C no-prepopulate-passes
+// This file tests that we don't generate any code for saturation when using the
+// unchecked intrinsics.
 
-// This file tests that we don't generate any code for saturation if
-// -Z saturating-float-casts is not enabled.
+// compile-flags: -C opt-level=3
 
 #![crate_type = "lib"]
 
@@ -12,7 +12,7 @@ pub fn f32_to_u32(x: f32) -> u32 {
     // CHECK-NOT: fcmp
     // CHECK-NOT: icmp
     // CHECK-NOT: select
-    x as u32
+    unsafe { x.to_int_unchecked() }
 }
 
 // CHECK-LABEL: @f32_to_i32
@@ -22,7 +22,7 @@ pub fn f32_to_i32(x: f32) -> i32 {
     // CHECK-NOT: fcmp
     // CHECK-NOT: icmp
     // CHECK-NOT: select
-    x as i32
+    unsafe { x.to_int_unchecked() }
 }
 
 #[no_mangle]
@@ -31,5 +31,5 @@ pub fn f64_to_u16(x: f64) -> u16 {
     // CHECK-NOT: fcmp
     // CHECK-NOT: icmp
     // CHECK-NOT: select
-    x as u16
+    unsafe { x.to_int_unchecked() }
 }

Diff for: src/test/ui/eprint-on-tls-drop.rs

@@ -1,5 +1,6 @@
 // run-pass
 // ignore-emscripten no processes
+// ignore-sgx no processes
 
 use std::cell::RefCell;
 use std::env;

Diff for: src/test/ui/issues/issue-15487.rs

@@ -2,6 +2,7 @@
 #![allow(unused_attributes)]
 // ignore-windows
 // ignore-wasm32-bare no libs to link
+// ignore-sgx no libs to link
 
 #![feature(link_args)]